Update liblmdb, unify 32/64 sources

2024-12-22 17:28:53 +00:00 · 2015-12-20 16:27:42 +00:00 · 2015-12-20 16:27:42 +00:00 · ba4e217c90
commit ba4e217c90
parent d0e434f0d8
58 changed files with 2464 additions and 16992 deletions
--- a/external/db_drivers/CMakeLists.txt
+++ b/external/db_drivers/CMakeLists.txt
@ -29,6 +29,6 @@
 # We aren't even going to check the system for an installed LMDB driver, as it is too
 # critical a consensus component to rely on dynamically linked libraries
 message(STATUS "Using ${ARCH_WIDTH}-bit LMDB from source tree")
-add_subdirectory(liblmdb${ARCH_WIDTH})
-set(LMDB_INCLUDE "${CMAKE_CURRENT_SOURCE_DIR}/liblmdb${ARCH_WIDTH}" CACHE STRING "LMDB Include path")
+add_subdirectory(liblmdb)
+set(LMDB_INCLUDE "${CMAKE_CURRENT_SOURCE_DIR}/liblmdb" CACHE STRING "LMDB Include path")
 set(LMDB_LIBRARY "lmdb" CACHE STRING "LMDB Library name")
--- a/external/db_drivers/liblmdb64/.gitignore
+++ b/external/db_drivers/liblmdb64/.gitignore
--- a/external/db_drivers/liblmdb64/CHANGES
+++ b/external/db_drivers/liblmdb64/CHANGES
@ -1,5 +1,57 @@
 LMDB 0.9 Change Log

+LMDB 0.9.18 Release Engineering
+	Fix robust mutex detection on glibc 2.10-11 (ITS#8330)
+	Check for utf8_to_utf16 failures (ITS#7992)
+	Catch strdup failure in mdb_dbi_open
+	Build
+		Additional makefile var tweaks (ITS#8169)
+	Documentation
+		Add Getting Started page
+
+
+LMDB 0.9.17 Release (2015/11/30)
+	Fix ITS#7377 catch calloc failure
+	Fix ITS#8237 regression from ITS#7589
+	Fix ITS#8238 page_split for DUPFIXED pages
+	Fix ITS#8221 MDB_PAGE_FULL on delete/rebalance
+	Fix ITS#8258 rebalance/split assert
+	Fix ITS#8263 cursor_put cursor tracking
+	Fix ITS#8264 cursor_del cursor tracking
+	Fix ITS#8310 cursor_del cursor tracking
+	Fix ITS#8299 mdb_del cursor tracking
+	Fix ITS#8300 mdb_del cursor tracking
+	Fix ITS#8304 mdb_del cursor tracking
+	Fix ITS#7771 fakepage cursor tracking
+	Fix ITS#7789 ensure mapsize >= pages in use
+	Fix ITS#7971 mdb_txn_renew0() new reader slots
+	Fix ITS#7969 use __sync_synchronize on non-x86
+	Fix ITS#8311 page_split from update_key
+	Fix ITS#8312 loose pages in nested txn
+	Fix ITS#8313 mdb_rebalance dummy cursor
+	Fix ITS#8315 dirty_room in nested txn
+	Fix ITS#8323 dirty_list in nested txn
+	Fix ITS#8316 page_merge cursor tracking
+	Fix ITS#8321 cursor tracking
+	Fix ITS#8319 mdb_load error messages
+	Fix ITS#8320 mdb_load plaintext input
+	Added mdb_txn_id() (ITS#7994)
+	Added robust mutex support
+	Miscellaneous cleanup/simplification
+	Build
+		Create install dirs if needed (ITS#8256)
+		Fix ThreadProc decl on Win32/MSVC (ITS#8270)
+		Added ssize_t typedef for MSVC (ITS#8067)
+		Use ANSI apis on Windows (ITS#8069)
+		Use O_SYNC if O_DSYNC,MDB_DSYNC are not defined (ITS#7209)
+		Allow passing AR to make (ITS#8168)
+		Allow passing mandir to make install (ITS#8169)
+
+LMDB 0.9.16 Release (2015/08/14)
+	Fix cursor EOF bug (ITS#8190)
+	Fix handling of subDB records (ITS#8181)
+	Fix mdb_midl_shrink() usage (ITS#8200)
+
 LMDB 0.9.15 Release (2015/06/19)
 	Fix txn init (ITS#7961,#7987)
 	Fix MDB_PREV_DUP (ITS#7955,#7671)
--- a/external/db_drivers/liblmdb64/CMakeLists.txt
+++ b/external/db_drivers/liblmdb64/CMakeLists.txt
@ -27,7 +27,7 @@
 # THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 if(FREEBSD)
-  set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DMDB_DSYNC=O_SYNC")
+  add_definitions(-DMDB_DSYNC=O_SYNC)
 endif()

 set (lmdb_sources
@ -41,3 +41,11 @@ add_library(lmdb
 target_link_libraries(lmdb
  LINK_PRIVATE
    ${CMAKE_THREAD_LIBS_INIT})
+if(WIN32)
+  target_link_libraries(lmdb
+    -lntdll)
+endif()
+if(${ARCH_WIDTH} EQUAL 32)
+  target_compile_definitions(lmdb
+    PUBLIC -DMDB_VL32)
+endif()
--- a/external/db_drivers/liblmdb32/COPYRIGHT
+++ b/external/db_drivers/liblmdb32/COPYRIGHT
--- a/external/db_drivers/liblmdb64/Doxyfile
+++ b/external/db_drivers/liblmdb64/Doxyfile
@ -582,7 +582,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.

-INPUT                  = lmdb.h midl.h mdb.c midl.c
+INPUT                  = lmdb.h midl.h mdb.c midl.c intro.doc

 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is
--- a/external/db_drivers/liblmdb32/LICENSE
+++ b/external/db_drivers/liblmdb32/LICENSE
--- a/external/db_drivers/liblmdb32/Makefile
+++ b/external/db_drivers/liblmdb32/Makefile
@ -8,24 +8,31 @@
 # platforms; you should not need to change any of these.
 # Read their descriptions in mdb.c if you do:
 #
-# - MDB_USE_POSIX_SEM
+# - MDB_USE_POSIX_MUTEX, MDB_USE_POSIX_SEM, MDB_USE_SYSV_SEM
 # - MDB_DSYNC
 # - MDB_FDATASYNC
 # - MDB_FDATASYNC_WORKS
 # - MDB_USE_PWRITEV
+# - MDB_USE_ROBUST
 #
 # There may be other macros in mdb.c of interest. You should
 # read mdb.c before changing any of them.
 #
 CC	= gcc
+AR	= ar
 W	= -W -Wall -Wno-unused-parameter -Wbad-function-cast -Wuninitialized
 THREADS = -pthread
 OPT = -O2 -g
 CFLAGS	= $(THREADS) $(OPT) $(W) $(XCFLAGS)
-LDLIBS	=
-SOLIBS	=
+LDLIBS	= # -lntdll # Windows needs ntdll
+SOLIBS	= # -lntdll
 prefix	= /usr/local
-XCFLAGS = -DVL32
+exec_prefix = $(prefix)
+bindir = $(exec_prefix)/bin
+libdir = $(exec_prefix)/lib
+includedir = $(prefix)/include
+datarootdir = $(prefix)/share
+mandir = $(datarootdir)/man

 ########################################################################

@ -37,10 +44,14 @@ PROGS	= $(IPROGS) mtest mtest2 mtest3 mtest4 mtest5
 all:	$(ILIBS) $(PROGS)

 install: $(ILIBS) $(IPROGS) $(IHDRS)
-	for f in $(IPROGS); do cp $$f $(DESTDIR)$(prefix)/bin; done
-	for f in $(ILIBS); do cp $$f $(DESTDIR)$(prefix)/lib; done
-	for f in $(IHDRS); do cp $$f $(DESTDIR)$(prefix)/include; done
-	for f in $(IDOCS); do cp $$f $(DESTDIR)$(prefix)/man/man1; done
+	mkdir -p $(DESTDIR)$(bindir)
+	mkdir -p $(DESTDIR)$(libdir)
+	mkdir -p $(DESTDIR)$(includedir)
+	mkdir -p $(DESTDIR)$(mandir)/man1
+	for f in $(IPROGS); do cp $$f $(DESTDIR)$(bindir); done
+	for f in $(ILIBS); do cp $$f $(DESTDIR)$(libdir); done
+	for f in $(IHDRS); do cp $$f $(DESTDIR)$(includedir); done
+	for f in $(IDOCS); do cp $$f $(DESTDIR)$(mandir)/man1; done

 clean:
 	rm -rf $(PROGS) *.[ao] *.[ls]o *~ testdb
@ -50,7 +61,7 @@ test:	all
 	./mtest && ./mdb_stat testdb

 liblmdb.a:	mdb.o midl.o
-	ar rs $@ mdb.o midl.o
+	$(AR) rs $@ mdb.o midl.o

 liblmdb.so:	mdb.lo midl.lo
 #	$(CC) $(LDFLAGS) -pthread -shared -Wl,-Bsymbolic -o $@ mdb.o midl.o $(SOLIBS)
--- a/external/db_drivers/liblmdb/intro.doc
+++ b/external/db_drivers/liblmdb/intro.doc
@ -0,0 +1,192 @@
+/*
+ * Copyright 2015 Howard Chu, Symas Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/** @page starting Getting Started
+
+LMDB is compact, fast, powerful, and robust and implements a simplified
+variant of the BerkeleyDB (BDB) API. (BDB is also very powerful, and verbosely
+documented in its own right.) After reading this page, the main
+\ref mdb documentation should make sense. Thanks to Bert Hubert
+for creating the
+<a href="https://github.com/ahupowerdns/ahutils/blob/master/lmdb-semantics.md">
+initial version</a> of this writeup.
+
+Everything starts with an environment, created by #mdb_env_create().
+Once created, this environment must also be opened with #mdb_env_open().
+
+#mdb_env_open() gets passed a name which is interpreted as a directory
+path. Note that this directory must exist already, it is not created
+for you. Within that directory, a lock file and a storage file will be
+generated. If you don't want to use a directory, you can pass the
+#MDB_NOSUBDIR option, in which case the path you provided is used
+directly as the data file, and another file with a "-lock" suffix
+added will be used for the lock file.
+
+Once the environment is open, a transaction can be created within it
+using #mdb_txn_begin(). Transactions may be read-write or read-only,
+and read-write transactions may be nested. A transaction must only
+be used by one thread at a time. Transactions are always required,
+even for read-only access. The transaction provides a consistent
+view of the data.
+
+Once a transaction has been created, a database can be opened within it
+using #mdb_dbi_open(). If only one database will ever be used in the
+environment, a NULL can be passed as the database name. For named
+databases, the #MDB_CREATE flag must be used to create the database
+if it doesn't already exist. Also, #mdb_env_set_maxdbs() must be
+called after #mdb_env_create() and before #mdb_env_open() to set the
+maximum number of named databases you want to support.
+
+Note: a single transaction can open multiple databases. Generally
+databases should only be opened once, by the first transaction in
+the process. After the first transaction completes, the database
+handles can freely be used by all subsequent transactions.
+
+Within a transaction, #mdb_get() and #mdb_put() can store single
+key/value pairs if that is all you need to do (but see \ref Cursors
+below if you want to do more).
+
+A key/value pair is expressed as two #MDB_val structures. This struct
+has two fields, \c mv_size and \c mv_data. The data is a \c void pointer to
+an array of \c mv_size bytes.
+
+Because LMDB is very efficient (and usually zero-copy), the data returned
+in an #MDB_val structure may be memory-mapped straight from disk. In
+other words <b>look but do not touch</b> (or free() for that matter).
+Once a transaction is closed, the values can no longer be used, so
+make a copy if you need to keep them after that.
+
+@section Cursors Cursors
+
+To do more powerful things, we must use a cursor.
+
+Within the transaction, a cursor can be created with #mdb_cursor_open().
+With this cursor we can store/retrieve/delete (multiple) values using
+#mdb_cursor_get(), #mdb_cursor_put(), and #mdb_cursor_del().
+
+#mdb_cursor_get() positions itself depending on the cursor operation
+requested, and for some operations, on the supplied key. For example,
+to list all key/value pairs in a database, use operation #MDB_FIRST for
+the first call to #mdb_cursor_get(), and #MDB_NEXT on subsequent calls,
+until the end is hit.
+
+To retrieve all keys starting from a specified key value, use #MDB_SET.
+For more cursor operations, see the \ref mdb docs.
+
+When using #mdb_cursor_put(), either the function will position the
+cursor for you based on the \b key, or you can use operation
+#MDB_CURRENT to use the current position of the cursor. Note that
+\b key must then match the current position's key.
+
+@subsection summary Summarizing the Opening
+
+So we have a cursor in a transaction which opened a database in an
+environment which is opened from a filesystem after it was
+separately created.
+
+Or, we create an environment, open it from a filesystem, create a
+transaction within it, open a database within that transaction,
+and create a cursor within all of the above.
+
+Got it?
+
+@section thrproc Threads and Processes
+
+LMDB uses POSIX locks on files, and these locks have issues if one
+process opens a file multiple times. Because of this, do not
+#mdb_env_open() a file multiple times from a single process. Instead,
+share the LMDB environment that has opened the file across all threads.
+Otherwise, if a single process opens the same environment multiple times,
+closing it once will remove all the locks held on it, and the other
+instances will be vulnerable to corruption from other processes.
+
+Also note that a transaction is tied to one thread by default using
+Thread Local Storage. If you want to pass read-only transactions across
+threads, you can use the #MDB_NOTLS option on the environment.
+
+@section txns Transactions, Rollbacks, etc.
+
+To actually get anything done, a transaction must be committed using
+#mdb_txn_commit(). Alternatively, all of a transaction's operations
+can be discarded using #mdb_txn_abort(). In a read-only transaction,
+any cursors will \b not automatically be freed. In a read-write
+transaction, all cursors will be freed and must not be used again.
+
+For read-only transactions, obviously there is nothing to commit to
+storage. The transaction still must eventually be aborted to close
+any database handle(s) opened in it, or committed to keep the
+database handles around for reuse in new transactions.
+
+In addition, as long as a transaction is open, a consistent view of
+the database is kept alive, which requires storage. A read-only
+transaction that no longer requires this consistent view should
+be terminated (committed or aborted) when the view is no longer
+needed (but see below for an optimization).
+
+There can be multiple simultaneously active read-only transactions
+but only one that can write. Once a single read-write transaction
+is opened, all further attempts to begin one will block until the
+first one is committed or aborted. This has no effect on read-only
+transactions, however, and they may continue to be opened at any time.
+
+@section dupkeys Duplicate Keys
+
+#mdb_get() and #mdb_put() respectively have no and only some support
+for multiple key/value pairs with identical keys. If there are multiple
+values for a key, #mdb_get() will only return the first value.
+
+When multiple values for one key are required, pass the #MDB_DUPSORT
+flag to #mdb_dbi_open(). In an #MDB_DUPSORT database, by default
+#mdb_put() will not replace the value for a key if the key existed
+already. Instead it will add the new value to the key. In addition,
+#mdb_del() will pay attention to the value field too, allowing for
+specific values of a key to be deleted.
+
+Finally, additional cursor operations become available for
+traversing through and retrieving duplicate values.
+
+@section optim Some Optimization
+
+If you frequently begin and abort read-only transactions, as an
+optimization, it is possible to only reset and renew a transaction.
+
+#mdb_txn_reset() releases any old copies of data kept around for
+a read-only transaction. To reuse this reset transaction, call
+#mdb_txn_renew() on it. Any cursors in this transaction must also
+be renewed using #mdb_cursor_renew().
+
+Note that #mdb_txn_reset() is similar to #mdb_txn_abort() and will
+close any databases you opened within the transaction.
+
+To permanently free a transaction, reset or not, use #mdb_txn_abort().
+
+@section cleanup Cleaning Up
+
+For read-only transactions, any cursors created within it must
+be closed using #mdb_cursor_close().
+
+It is very rarely necessary to close a database handle, and in
+general they should just be left open.
+
+@section onward The Full API
+
+The full \ref mdb documentation lists further details, like how to:
+
+  \li size a database (the default limits are intentionally small)
+  \li drop and clean a database
+  \li detect and report errors
+  \li optimize (bulk) loading speed
+  \li (temporarily) reduce robustness to gain even more speed
+  \li gather statistics about the database
+  \li define custom sort orders
+
+*/
--- a/external/db_drivers/liblmdb32/lmdb.h
+++ b/external/db_drivers/liblmdb32/lmdb.h
@ -40,6 +40,9 @@
 *	corrupt the database. Of course if your application code is known to
 *	be bug-free (...) then this is not an issue.
 *
+ *	If this is your first time using a transactional embedded key/value
+ *	store, you may find the \ref starting page to be helpful.
+ *
 *	@section caveats_sec Caveats
 *	Troubleshooting the lock file, plus semaphores on BSD systems:
 *
@ -49,11 +52,16 @@
 *	  stale locks can block further operation.
 *
 *	  Fix: Check for stale readers periodically, using the
- *	  #mdb_reader_check function or the \ref mdb_stat_1 "mdb_stat" tool. Or just
- *	  make all programs using the database close it; the lockfile
- *	  is always reset on first open of the environment.
+ *	  #mdb_reader_check function or the \ref mdb_stat_1 "mdb_stat" tool.
+ *	  Stale writers will be cleared automatically on most systems:
+ *	  - Windows - automatic
+ *	  - BSD, systems using SysV semaphores - automatic
+ *	  - Linux, systems using POSIX mutexes with Robust option - automatic
+ *	  Otherwise just make all programs using the database close it;
+ *	  the lockfile is always reset on first open of the environment.
 *
- *	- On BSD systems or others configured with MDB_USE_POSIX_SEM,
+ *	- On BSD systems or others configured with MDB_USE_SYSV_SEM or
+ *	  MDB_USE_POSIX_SEM,
 *	  startup can fail due to semaphores owned by another userid.
 *
 *	  Fix: Open and close the database as the user which owns the
@ -106,6 +114,9 @@
 *	  for stale readers is performed or the lockfile is reset,
 *	  since the process may not remove it from the lockfile.
 *
+ *	  This does not apply to write transactions if the system clears
+ *	  stale writers, see above.
+ *
 *	- If you do that anyway, do a periodic check for stale readers. Or
 *	  close the environment once in a while, so the lockfile can get reset.
 *
@ -150,6 +161,7 @@
 #define _LMDB_H_

 #include <sys/types.h>
+#include <inttypes.h>

 #ifdef __cplusplus
 extern "C" {
@ -162,6 +174,13 @@ typedef	int	mdb_mode_t;
 typedef	mode_t	mdb_mode_t;
 #endif

+#ifdef MDB_VL32
+typedef uint64_t	mdb_size_t;
+#define mdb_env_create(env)	mdb_env_create_vl32(env)	/**< Prevent mixing with non-VL32 builds */
+#else
+typedef size_t	mdb_size_t;
+#endif
+
 /** An abstraction for a file handle.
 *	On POSIX systems file handles are small integers. On Windows
 *	they're opaque pointers.
@ -184,7 +203,7 @@ typedef int mdb_filehandle_t;
 /** Library minor version */
 #define MDB_VERSION_MINOR	9
 /** Library patch version */
-#define MDB_VERSION_PATCH	15
+#define MDB_VERSION_PATCH	70

 /** Combine args a,b,c into a single integer for easy version comparisons */
 #define MDB_VERINT(a,b,c)	(((a) << 24) | ((b) << 16) | (c))
@ -194,7 +213,7 @@ typedef int mdb_filehandle_t;
 	MDB_VERINT(MDB_VERSION_MAJOR,MDB_VERSION_MINOR,MDB_VERSION_PATCH)

 /** The release date of this library version */
-#define MDB_VERSION_DATE	"June 19, 2015"
+#define MDB_VERSION_DATE	"December 19, 2015"

 /** A stringifier for the version info */
 #define MDB_VERSTR(a,b,c,d)	"LMDB " #a "." #b "." #c ": (" d ")"
@ -391,7 +410,7 @@ typedef enum MDB_cursor_op {
 #define MDB_PAGE_NOTFOUND	(-30797)
 	/** Located page was wrong type */
 #define MDB_CORRUPTED	(-30796)
-	/** Update of meta page failed, probably I/O error */
+	/** Update of meta page failed or environment had fatal error */
 #define MDB_PANIC		(-30795)
 	/** Environment version mismatch */
 #define MDB_VERSION_MISMATCH	(-30794)
@ -413,11 +432,18 @@ typedef enum MDB_cursor_op {
 #define MDB_PAGE_FULL	(-30786)
 	/** Database contents grew beyond environment mapsize */
 #define MDB_MAP_RESIZED	(-30785)
-	/** MDB_INCOMPATIBLE: Operation and DB incompatible, or DB flags changed */
+	/** Operation and DB incompatible, or DB type changed. This can mean:
+	 *	<ul>
+	 *	<li>The operation expects an #MDB_DUPSORT / #MDB_DUPFIXED database.
+	 *	<li>Opening a named DB when the unnamed DB has #MDB_DUPSORT / #MDB_INTEGERKEY.
+	 *	<li>Accessing a data record as a database, or vice versa.
+	 *	<li>The database was dropped and recreated with different flags.
+	 *	</ul>
+	 */
 #define MDB_INCOMPATIBLE	(-30784)
 	/** Invalid reuse of reader locktable slot */
 #define MDB_BAD_RSLOT		(-30783)
-	/** Transaction cannot recover - it must be aborted */
+	/** Transaction must abort, has a child, or is invalid */
 #define MDB_BAD_TXN			(-30782)
 	/** Unsupported size of key/DB name/data, or wrong DUPFIXED size */
 #define MDB_BAD_VALSIZE		(-30781)
@ -432,18 +458,18 @@ typedef struct MDB_stat {
 	unsigned int	ms_psize;			/**< Size of a database page.
 											This is currently the same for all databases. */
 	unsigned int	ms_depth;			/**< Depth (height) of the B-tree */
-	size_t		ms_branch_pages;	/**< Number of internal (non-leaf) pages */
-	size_t		ms_leaf_pages;		/**< Number of leaf pages */
-	size_t		ms_overflow_pages;	/**< Number of overflow pages */
-	size_t		ms_entries;			/**< Number of data items */
+	mdb_size_t		ms_branch_pages;	/**< Number of internal (non-leaf) pages */
+	mdb_size_t		ms_leaf_pages;		/**< Number of leaf pages */
+	mdb_size_t		ms_overflow_pages;	/**< Number of overflow pages */
+	mdb_size_t		ms_entries;			/**< Number of data items */
 } MDB_stat;

 /** @brief Information about the environment */
 typedef struct MDB_envinfo {
 	void	*me_mapaddr;			/**< Address of map, if fixed */
-	size_t	me_mapsize;				/**< Size of the data memory map */
-	size_t	me_last_pgno;			/**< ID of the last used page */
-	size_t	me_last_txnid;			/**< ID of the last committed transaction */
+	mdb_size_t	me_mapsize;				/**< Size of the data memory map */
+	mdb_size_t	me_last_pgno;			/**< ID of the last used page */
+	mdb_size_t	me_last_txnid;			/**< ID of the last committed transaction */
 	unsigned int me_maxreaders;		/**< max reader slots in the environment */
 	unsigned int me_numreaders;		/**< max reader slots used in the environment */
 } MDB_envinfo;
@ -810,7 +836,7 @@ int  mdb_env_get_fd(MDB_env *env, mdb_filehandle_t *fd);
 	 *   	an active write transaction.
 	 * </ul>
 	 */
-int  mdb_env_set_mapsize(MDB_env *env, size_t size);
+int  mdb_env_set_mapsize(MDB_env *env, mdb_size_t size);

 	/** @brief Set the maximum number of threads/reader slots for the environment.
 	 *
@ -923,6 +949,10 @@ int  mdb_env_set_assert(MDB_env *env, MDB_assert_func *func);
 	 * <ul>
 	 *	<li>#MDB_RDONLY
 	 *		This transaction will not perform any write operations.
+	 *	<li>#MDB_NOSYNC
+	 *		Don't flush system buffers to disk when committing this transaction.
+	 *	<li>#MDB_NOMETASYNC
+	 *		Flush system buffers but omit metadata flush when committing this transaction.
 	 * </ul>
 	 * @param[out] txn Address where the new #MDB_txn handle will be stored
 	 * @return A non-zero error value on failure and 0 on success. Some possible
@ -946,6 +976,17 @@ int  mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **
 	 */
 MDB_env *mdb_txn_env(MDB_txn *txn);

+	/** @brief Return the transaction's ID.
+	 *
+	 * This returns the identifier associated with this transaction. For a
+	 * read-only transaction, this corresponds to the snapshot being read;
+	 * concurrent readers will frequently have the same transaction ID.
+	 *
+	 * @param[in] txn A transaction handle returned by #mdb_txn_begin()
+	 * @return A transaction ID, valid if input is an active transaction.
+	 */
+mdb_size_t mdb_txn_id(MDB_txn *txn);
+
 	/** @brief Commit all the operations of a transaction into the database.
 	 *
 	 * The transaction handle is freed. It and its cursors must not be used
@ -1034,8 +1075,9 @@ int  mdb_txn_renew(MDB_txn *txn);
 	 * any other transaction in the process may use this function.
 	 *
 	 * To use named databases (with name != NULL), #mdb_env_set_maxdbs()
-	 * must be called before opening the environment.  Database names
-	 * are kept as keys in the unnamed database.
+	 * must be called before opening the environment.  Database names are
+	 * keys in the unnamed database, and may be read but not written.
+	 *
 	 * @param[in] txn A transaction handle returned by #mdb_txn_begin()
 	 * @param[in] name The name of the database to open. If only a single
 	 * 	database is needed in the environment, this value may be NULL.
@ -1272,7 +1314,8 @@ int  mdb_get(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data);
 	 *		the next update operation or the transaction ends. This saves
 	 *		an extra memcpy if the data is being generated later.
 	 *		LMDB does nothing else with this memory, the caller is expected
-	 *		to modify all of the space requested.
+	 *		to modify all of the space requested. This flag must not be
+	 *		specified if the database was opened with #MDB_DUPSORT.
 	 *	<li>#MDB_APPEND - append the given key/data pair to the end of the
 	 *		database. This option allows fast bulk loading when keys are
 	 *		already known to be in the correct order. Loading unsorted keys
@ -1428,13 +1471,15 @@ int  mdb_cursor_get(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
 	 *		the database supports duplicates (#MDB_DUPSORT).
 	 *	<li>#MDB_RESERVE - reserve space for data of the given size, but
 	 *		don't copy the given data. Instead, return a pointer to the
-	 *		reserved space, which the caller can fill in later. This saves
-	 *		an extra memcpy if the data is being generated later.
+	 *		reserved space, which the caller can fill in later - before
+	 *		the next update operation or the transaction ends. This saves
+	 *		an extra memcpy if the data is being generated later. This flag
+	 *		must not be specified if the database was opened with #MDB_DUPSORT.
 	 *	<li>#MDB_APPEND - append the given key/data pair to the end of the
 	 *		database. No key comparisons are performed. This option allows
 	 *		fast bulk loading when keys are already known to be in the
 	 *		correct order. Loading unsorted keys with this flag will cause
-	 *		data corruption.
+	 *		a #MDB_KEYEXIST error.
 	 *	<li>#MDB_APPENDDUP - as above, but for sorted dup data.
 	 *	<li>#MDB_MULTIPLE - store multiple contiguous data elements in a
 	 *		single request. This flag may only be specified if the database
--- a/external/db_drivers/liblmdb32/mdb.c
+++ b/external/db_drivers/liblmdb32/mdb.c
--- a/external/db_drivers/liblmdb32/mdb_copy.1
+++ b/external/db_drivers/liblmdb32/mdb_copy.1
--- a/external/db_drivers/liblmdb32/mdb_copy.c
+++ b/external/db_drivers/liblmdb32/mdb_copy.c
--- a/external/db_drivers/liblmdb32/mdb_dump.1
+++ b/external/db_drivers/liblmdb32/mdb_dump.1
@ -5,7 +5,6 @@
 mdb_dump \- LMDB environment export tool
 .SH SYNOPSIS
 .B mdb_dump
-.BR \ envpath
 [\c
 .BR \-V ]
 [\c
@ -19,6 +18,7 @@ mdb_dump \- LMDB environment export tool
 [\c
 .BR \-a \ |
 .BI \-s \ subdb\fR]
+.BR \ envpath
 .SH DESCRIPTION
 The
 .B mdb_dump
--- a/external/db_drivers/liblmdb32/mdb_dump.c
+++ b/external/db_drivers/liblmdb32/mdb_dump.c
@ -25,6 +25,15 @@
 #else
 #define Z	"z"
 #endif
+#ifdef MDB_VL32
+#ifdef _WIN32
+#define	Y	"I64"
+#else
+#define	Y	"ll"
+#endif
+#else
+#define Y	Z
+#endif

 #define PRINT	1
 static int mode;
@ -115,7 +124,7 @@ static int dumpit(MDB_txn *txn, MDB_dbi dbi, char *name)
 	if (name)
 		printf("database=%s\n", name);
 	printf("type=btree\n");
-	printf("mapsize=%" Z "u\n", info.me_mapsize);
+	printf("mapsize=%" Y "u\n", info.me_mapsize);
 	if (info.me_mapaddr)
 		printf("mapaddr=%p\n", info.me_mapaddr);
 	printf("maxreaders=%u\n", info.me_maxreaders);
@ -155,7 +164,7 @@ static int dumpit(MDB_txn *txn, MDB_dbi dbi, char *name)

 static void usage(char *prog)
 {
-	fprintf(stderr, "usage: %s dbpath [-V] [-f output] [-l] [-n] [-p] [-a|-s subdb]\n", prog);
+	fprintf(stderr, "usage: %s [-V] [-f output] [-l] [-n] [-p] [-a|-s subdb] dbpath\n", prog);
 	exit(EXIT_FAILURE);
 }

--- a/external/db_drivers/liblmdb64/mdb_load.1
+++ b/external/db_drivers/liblmdb64/mdb_load.1
@ -5,7 +5,6 @@
 mdb_load \- LMDB environment import tool
 .SH SYNOPSIS
 .B mdb_load
-.BR \ envpath
 [\c
 .BR \-V ]
 [\c
@ -18,6 +17,7 @@ mdb_load \- LMDB environment import tool
 .BR \-N ]
 [\c
 .BR \-T ]
+.BR \ envpath
 .SH DESCRIPTION
 The
 .B mdb_load
--- a/external/db_drivers/liblmdb32/mdb_load.c
+++ b/external/db_drivers/liblmdb32/mdb_load.c
@ -43,6 +43,15 @@ static MDB_val kbuf, dbuf;
 #else
 #define Z	"z"
 #endif
+#ifdef MDB_VL32
+#ifdef _WIN32
+#define	Y	"I64"
+#else
+#define	Y	"ll"
+#endif
+#else
+#define Y	Z
+#endif

 #define STRLENOF(s)	(sizeof(s)-1)

@ -112,7 +121,7 @@ static void readhdr(void)
 			int i;
 			ptr = memchr(dbuf.mv_data, '\n', dbuf.mv_size);
 			if (ptr) *ptr = '\0';
-			i = sscanf((char *)dbuf.mv_data+STRLENOF("mapsize="), "%" Z "u", &info.me_mapsize);
+			i = sscanf((char *)dbuf.mv_data+STRLENOF("mapsize="), "%" Y "u", &info.me_mapsize);
 			if (i != 1) {
 				fprintf(stderr, "%s: line %" Z "d: invalid mapsize %s\n",
 					prog, lineno, (char *)dbuf.mv_data+STRLENOF("mapsize="));
@ -276,7 +285,7 @@ badend:

 static void usage(void)
 {
-	fprintf(stderr, "usage: %s dbpath [-V] [-f input] [-n] [-s name] [-N] [-T]\n", prog);
+	fprintf(stderr, "usage: %s [-V] [-f input] [-n] [-s name] [-N] [-T] dbpath\n", prog);
 	exit(EXIT_FAILURE);
 }

@ -327,7 +336,7 @@ int main(int argc, char *argv[])
 			putflags = MDB_NOOVERWRITE|MDB_NODUPDATA;
 			break;
 		case 'T':
-			mode |= NOHDR;
+			mode |= NOHDR | PRINT;
 			break;
 		default:
 			usage();
@ -400,20 +409,22 @@ int main(int argc, char *argv[])

 		while(1) {
 			rc = readline(&key, &kbuf);
-			if (rc == EOF)
+			if (rc)  /* rc == EOF */
 				break;
-			if (rc)
-				goto txn_abort;

 			rc = readline(&data, &dbuf);
-			if (rc)
+			if (rc) {
+				fprintf(stderr, "%s: line %" Z "d: failed to read key value\n", prog, lineno);
 				goto txn_abort;
-			
+			}
+
 			rc = mdb_cursor_put(mc, &key, &data, putflags);
 			if (rc == MDB_KEYEXIST && putflags)
 				continue;
-			if (rc)
+			if (rc) {
+				fprintf(stderr, "mdb_cursor_put failed, error %d %s\n", rc, mdb_strerror(rc));
 				goto txn_abort;
+			}
 			batch++;
 			if (batch == 100) {
 				rc = mdb_txn_commit(txn);
--- a/external/db_drivers/liblmdb64/mdb_stat.1
+++ b/external/db_drivers/liblmdb64/mdb_stat.1
@ -5,7 +5,6 @@
 mdb_stat \- LMDB environment status tool
 .SH SYNOPSIS
 .B mdb_stat
-.BR \ envpath
 [\c
 .BR \-V ]
 [\c
@ -19,6 +18,7 @@ mdb_stat \- LMDB environment status tool
 [\c
 .BR \-a \ |
 .BI \-s \ subdb\fR]
+.BR \ envpath
 .SH DESCRIPTION
 The
 .B mdb_stat
--- a/external/db_drivers/liblmdb64/mdb_stat.c
+++ b/external/db_drivers/liblmdb64/mdb_stat.c
@ -22,6 +22,15 @@
 #else
 #define	Z	"z"
 #endif
+#ifdef MDB_VL32
+#ifdef _WIN32
+#define	Y	"I64"
+#else
+#define	Y	"ll"
+#endif
+#else
+#define Y	Z
+#endif

 static void prstat(MDB_stat *ms)
 {
@ -29,15 +38,15 @@ static void prstat(MDB_stat *ms)
 	printf("  Page size: %u\n", ms->ms_psize);
 #endif
 	printf("  Tree depth: %u\n", ms->ms_depth);
-	printf("  Branch pages: %"Z"u\n", ms->ms_branch_pages);
-	printf("  Leaf pages: %"Z"u\n", ms->ms_leaf_pages);
-	printf("  Overflow pages: %"Z"u\n", ms->ms_overflow_pages);
-	printf("  Entries: %"Z"u\n", ms->ms_entries);
+	printf("  Branch pages: %"Y"u\n", ms->ms_branch_pages);
+	printf("  Leaf pages: %"Y"u\n", ms->ms_leaf_pages);
+	printf("  Overflow pages: %"Y"u\n", ms->ms_overflow_pages);
+	printf("  Entries: %"Y"u\n", ms->ms_entries);
 }

 static void usage(char *prog)
 {
-	fprintf(stderr, "usage: %s dbpath [-V] [-n] [-e] [-r[r]] [-f[f[f]]] [-a|-s subdb]\n", prog);
+	fprintf(stderr, "usage: %s [-V] [-n] [-e] [-r[r]] [-f[f[f]]] [-a|-s subdb] dbpath\n", prog);
 	exit(EXIT_FAILURE);
 }

@ -125,11 +134,11 @@ int main(int argc, char *argv[])
 		(void)mdb_env_info(env, &mei);
 		printf("Environment Info\n");
 		printf("  Map address: %p\n", mei.me_mapaddr);
-		printf("  Map size: %"Z"u\n", mei.me_mapsize);
+		printf("  Map size: %"Y"u\n", mei.me_mapsize);
 		printf("  Page size: %u\n", mst.ms_psize);
-		printf("  Max pages: %"Z"u\n", mei.me_mapsize / mst.ms_psize);
-		printf("  Number of pages used: %"Z"u\n", mei.me_last_pgno+1);
-		printf("  Last transaction ID: %"Z"u\n", mei.me_last_txnid);
+		printf("  Max pages: %"Y"u\n", mei.me_mapsize / mst.ms_psize);
+		printf("  Number of pages used: %"Y"u\n", mei.me_last_pgno+1);
+		printf("  Last transaction ID: %"Y"u\n", mei.me_last_txnid);
 		printf("  Max readers: %u\n", mei.me_maxreaders);
 		printf("  Number of readers used: %u\n", mei.me_numreaders);
 	}
--- a/external/db_drivers/liblmdb64/midl.c
+++ b/external/db_drivers/liblmdb64/midl.c
@ -116,7 +116,7 @@ void mdb_midl_free(MDB_IDL ids)
 		free(ids-1);
 }

-int mdb_midl_shrink( MDB_IDL *idp )
+void mdb_midl_shrink( MDB_IDL *idp )
 {
 	MDB_IDL ids = *idp;
 	if (*(--ids) > MDB_IDL_UM_MAX &&
@ -124,9 +124,7 @@ int mdb_midl_shrink( MDB_IDL *idp )
 	{
 		*ids++ = MDB_IDL_UM_MAX;
 		*idp = ids;
-		return 1;
 	}
-	return 0;
 }

 static int mdb_midl_grow( MDB_IDL *idp, int num )
@ -356,5 +354,67 @@ int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id )
 	return 0;
 }

+#ifdef MDB_VL32
+unsigned mdb_mid3l_search( MDB_ID3L ids, MDB_ID id )
+{
+	/*
+	 * binary search of id in ids
+	 * if found, returns position of id
+	 * if not found, returns first position greater than id
+	 */
+	unsigned base = 0;
+	unsigned cursor = 1;
+	int val = 0;
+	unsigned n = (unsigned)ids[0].mid;
+
+	while( 0 < n ) {
+		unsigned pivot = n >> 1;
+		cursor = base + pivot + 1;
+		val = CMP( id, ids[cursor].mid );
+
+		if( val < 0 ) {
+			n = pivot;
+
+		} else if ( val > 0 ) {
+			base = cursor;
+			n -= pivot + 1;
+
+		} else {
+			return cursor;
+		}
+	}
+
+	if( val > 0 ) {
+		++cursor;
+	}
+	return cursor;
+}
+
+int mdb_mid3l_insert( MDB_ID3L ids, MDB_ID3 *id )
+{
+	unsigned x, i;
+
+	x = mdb_mid3l_search( ids, id->mid );
+
+	if( x < 1 ) {
+		/* internal error */
+		return -2;
+	}
+
+	if ( x <= ids[0].mid && ids[x].mid == id->mid ) {
+		/* duplicate */
+		return -1;
+	}
+
+	/* insert id */
+	ids[0].mid++;
+	for (i=(unsigned)ids[0].mid; i>x; i--)
+		ids[i] = ids[i-1];
+	ids[x] = *id;
+
+	return 0;
+}
+#endif /* MDB_VL32 */
+
 /** @} */
 /** @} */
--- a/external/db_drivers/liblmdb32/midl.h
+++ b/external/db_drivers/liblmdb32/midl.h
@ -27,6 +27,7 @@
 #define _MDB_MIDL_H_

 #include <stddef.h>
+#include <inttypes.h>

 #ifdef __cplusplus
 extern "C" {
@ -42,7 +43,11 @@ extern "C" {
 	/** A generic unsigned ID number. These were entryIDs in back-bdb.
 	 *	Preferably it should have the same size as a pointer.
 	 */
+#ifdef MDB_VL32
+typedef uint64_t MDB_ID;
+#else
 typedef size_t MDB_ID;
+#endif

 	/** An IDL is an ID List, a sorted array of IDs. The first
 	 * element of the array is a counter for how many actual
@ -55,10 +60,10 @@ typedef MDB_ID *MDB_IDL;
 /* IDL sizes - likely should be even bigger
 *   limiting factors: sizeof(ID), thread stack size
 */
-#ifdef VL32
+#ifdef MDB_VL32
 #define	MDB_IDL_LOGN	10	/* DB_SIZE is 2^10, UM_SIZE is 2^11 */
 #else
- #define	MDB_IDL_LOGN	16	/* DB_SIZE is 2^16, UM_SIZE is 2^17 */
+#define	MDB_IDL_LOGN	16	/* DB_SIZE is 2^16, UM_SIZE is 2^17 */
 #endif
 #define MDB_IDL_DB_SIZE		(1<<MDB_IDL_LOGN)
 #define MDB_IDL_UM_SIZE		(1<<(MDB_IDL_LOGN+1))
@ -102,9 +107,8 @@ void mdb_midl_free(MDB_IDL ids);
 	/** Shrink an IDL.
 	 * Return the IDL to the default size if it has grown larger.
 	 * @param[in,out] idp	Address of the IDL to shrink.
-	 * @return	0 on no change, non-zero if shrunk.
 	 */
-int mdb_midl_shrink(MDB_IDL *idp);
+void mdb_midl_shrink(MDB_IDL *idp);

 	/** Make room for num additional elements in an IDL.
 	 * @param[in,out] idp	Address of the IDL.
@ -182,6 +186,20 @@ int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id );
 	 */
 int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id );

+#ifdef MDB_VL32
+typedef struct MDB_ID3 {
+	MDB_ID mid;		/**< The ID */
+	void *mptr;		/**< The pointer */
+	unsigned int mcnt;		/**< Number of pages */
+	unsigned int mref;		/**< Refcounter */
+} MDB_ID3;
+
+typedef MDB_ID3 *MDB_ID3L;
+
+unsigned mdb_mid3l_search( MDB_ID3L ids, MDB_ID id );
+int mdb_mid3l_insert( MDB_ID3L ids, MDB_ID3 *id );
+
+#endif /* MDB_VL32 */
 /** @} */
 /** @} */
 #ifdef __cplusplus
--- a/external/db_drivers/liblmdb64/mtest.c
+++ b/external/db_drivers/liblmdb64/mtest.c
--- a/external/db_drivers/liblmdb32/mtest2.c
+++ b/external/db_drivers/liblmdb32/mtest2.c
--- a/external/db_drivers/liblmdb32/mtest3.c
+++ b/external/db_drivers/liblmdb32/mtest3.c
--- a/external/db_drivers/liblmdb32/mtest4.c
+++ b/external/db_drivers/liblmdb32/mtest4.c
--- a/external/db_drivers/liblmdb32/mtest5.c
+++ b/external/db_drivers/liblmdb32/mtest5.c
--- a/external/db_drivers/liblmdb32/mtest6.c
+++ b/external/db_drivers/liblmdb32/mtest6.c
--- a/external/db_drivers/liblmdb32/sample-bdb.txt
+++ b/external/db_drivers/liblmdb32/sample-bdb.txt
--- a/external/db_drivers/liblmdb32/sample-mdb.txt
+++ b/external/db_drivers/liblmdb32/sample-mdb.txt
--- a/external/db_drivers/liblmdb32/tooltag
+++ b/external/db_drivers/liblmdb32/tooltag
--- a/external/db_drivers/liblmdb32/.gitignore
+++ b/external/db_drivers/liblmdb32/.gitignore
@ -1,20 +0,0 @@
-mtest
-mtest[23456]
-testdb
-mdb_copy
-mdb_stat
-*.[ao]
-*.so
-*.exe
-*[~#]
-*.bak
-*.orig
-*.rej
-*.gcov
-*.gcda
-*.gcno
-core
-core.*
-valgrind.*
-man/
-html/
--- a/external/db_drivers/liblmdb32/CHANGES
+++ b/external/db_drivers/liblmdb32/CHANGES
@ -1,140 +0,0 @@
-LMDB 0.9 Change Log
-
-LMDB 0.9.15 Release (2015/06/19)
-	Fix txn init (ITS#7961,#7987)
-	Fix MDB_PREV_DUP (ITS#7955,#7671)
-	Fix compact of empty env (ITS#7956)
-	Fix mdb_copy file mode
-	Fix mdb_env_close() after failed mdb_env_open()
-	Fix mdb_rebalance collapsing root (ITS#8062)
-	Fix mdb_load with large values (ITS#8066)
-	Fix to retry writes on EINTR (ITS#8106)
-	Fix mdb_cursor_del on empty DB (ITS#8109)
-	Fix MDB_INTEGERDUP key compare (ITS#8117)
-	Fix error handling (ITS#7959,#8157,etc.)
-	Fix race conditions (ITS#7969,7970)
-	Added workaround for fdatasync bug in ext3fs
-	Build
-		Don't use -fPIC for static lib
-		Update .gitignore (ITS#7952,#7953)
-		Cleanup for "make test" (ITS#7841), "make clean", mtest*.c
-		Misc. Android/Windows cleanup
-	Documentation
-		Fix MDB_APPEND doc
-		Fix MDB_MAXKEYSIZE doc (ITS#8156)
-		Fix mdb_cursor_put,mdb_cursor_del EACCES description
-		Fix mdb_env_sync(MDB_RDONLY env) doc (ITS#8021)
-		Clarify MDB_WRITEMAP doc (ITS#8021)
-		Clarify mdb_env_open doc
-		Clarify mdb_dbi_open doc
-
-LMDB 0.9.14 Release (2014/09/20)
-	Fix to support 64K page size (ITS#7713)
-	Fix to persist decreased as well as increased mapsizes (ITS#7789)
-	Fix cursor bug when deleting last node of a DUPSORT key
-	Fix mdb_env_info to return FIXEDMAP address
-	Fix ambiguous error code from writing to closed DBI (ITS#7825)
-	Fix mdb_copy copying past end of file (ITS#7886)
-	Fix cursor bugs from page_merge/rebalance
-	Fix to dirty fewer pages in deletes (mdb_page_loose())
-	Fix mdb_dbi_open creating subDBs (ITS#7917)
-	Fix mdb_cursor_get(_DUP) with single value (ITS#7913)
-	Fix Windows compat issues in mtests (ITS#7879)
-	Add compacting variant of mdb_copy
-	Add BigEndian integer key compare code
-	Add mdb_dump/mdb_load utilities
-
-LMDB 0.9.13 Release (2014/06/18)
-	Fix mdb_page_alloc unlimited overflow page search
-	Documentation
-		Re-fix MDB_CURRENT doc (ITS#7793)
-		Fix MDB_GET_MULTIPLE/MDB_NEXT_MULTIPLE doc
-
-LMDB 0.9.12 Release (2014/06/13)
-	Fix MDB_GET_BOTH regression (ITS#7875,#7681)
-	Fix MDB_MULTIPLE writing multiple keys (ITS#7834)
-	Fix mdb_rebalance (ITS#7829)
-	Fix mdb_page_split (ITS#7815)
-	Fix md_entries count (ITS#7861,#7828,#7793)
-	Fix MDB_CURRENT (ITS#7793)
-	Fix possible crash on Windows DLL detach
-	Misc code cleanup
-	Documentation
-		mdb_cursor_put: cursor moves on error (ITS#7771)
-
-
-LMDB 0.9.11 Release (2014/01/15)
-	Add mdb_env_set_assert() (ITS#7775)
-	Fix: invalidate txn on page allocation errors (ITS#7377)
-	Fix xcursor tracking in mdb_cursor_del0() (ITS#7771)
-	Fix corruption from deletes (ITS#7756)
-	Fix Windows/MSVC build issues
-	Raise safe limit of max MDB_MAXKEYSIZE
-	Misc code cleanup
-	Documentation
-		Remove spurious note about non-overlapping flags (ITS#7665)
-
-LMDB 0.9.10 Release (2013/11/12)
-	Add MDB_NOMEMINIT option
-	Fix mdb_page_split() again (ITS#7589)
-	Fix MDB_NORDAHEAD definition (ITS#7734)
-	Fix mdb_cursor_del() positioning (ITS#7733)
-	Partial fix for larger page sizes (ITS#7713)
-	Fix Windows64/MSVC build issues
-
-LMDB 0.9.9 Release (2013/10/24)
-	Add mdb_env_get_fd()
-	Add MDB_NORDAHEAD option
-	Add MDB_NOLOCK option
-	Avoid wasting space in mdb_page_split() (ITS#7589)
-	Fix mdb_page_merge() cursor fixup (ITS#7722)
-	Fix mdb_cursor_del() on last delete (ITS#7718)
-	Fix adding WRITEMAP on existing env (ITS#7715)
-	Fix nested txns (ITS#7515)
-	Fix mdb_env_copy() O_DIRECT bug (ITS#7682)
-	Fix mdb_cursor_set(SET_RANGE) return code (ITS#7681)
-	Fix mdb_rebalance() cursor fixup (ITS#7701)
-	Misc code cleanup
-	Documentation
-		Note that by default, readers need write access
-
-
-LMDB 0.9.8 Release (2013/09/09)
-	Allow mdb_env_set_mapsize() on an open environment
-	Fix mdb_dbi_flags() (ITS#7672)
-	Fix mdb_page_unspill() in nested txns
-	Fix mdb_cursor_get(CURRENT|NEXT) after a delete
-	Fix mdb_cursor_get(DUP) to always return key (ITS#7671)
-	Fix mdb_cursor_del() to always advance to next item (ITS#7670)
-	Fix mdb_cursor_set(SET_RANGE) for tree with single page (ITS#7681)
-	Fix mdb_env_copy() retry open if O_DIRECT fails (ITS#7682)
-	Tweak mdb_page_spill() to be less aggressive
-	Documentation
-		Update caveats since mdb_reader_check() added in 0.9.7
-
-LMDB 0.9.7 Release (2013/08/17)
-	Don't leave stale lockfile on failed RDONLY open (ITS#7664)
-	Fix mdb_page_split() ref beyond cursor depth
-	Fix read txn data race (ITS#7635)
-	Fix mdb_rebalance (ITS#7536, #7538)
-	Fix mdb_drop() (ITS#7561)
-	Misc DEBUG macro fixes
-	Add MDB_NOTLS envflag
-	Add mdb_env_copyfd()
-	Add mdb_txn_env() (ITS#7660)
-	Add mdb_dbi_flags() (ITS#7661)
-	Add mdb_env_get_maxkeysize()
-	Add mdb_env_reader_list()/mdb_env_reader_check()
-	Add mdb_page_spill/unspill, remove hard txn size limit
-	Use shorter names for semaphores (ITS#7615)
-	Build
-		Fix install target (ITS#7656)
-	Documentation
-		Misc updates for cursors, DB handles, data lifetime
-
-LMDB 0.9.6 Release (2013/02/25)
-	Many fixes/enhancements
-
-LMDB 0.9.5 Release (2012/11/30)
-	Renamed from libmdb to liblmdb
-	Many fixes/enhancements
--- a/external/db_drivers/liblmdb32/CMakeLists.txt
+++ b/external/db_drivers/liblmdb32/CMakeLists.txt
@ -1,46 +0,0 @@
-# Copyright (c) 2014-2015, The Monero Project
-# 
-# All rights reserved.
-# 
-# Redistribution and use in source and binary forms, with or without modification, are
-# permitted provided that the following conditions are met:
-# 
-# 1. Redistributions of source code must retain the above copyright notice, this list of
-#    conditions and the following disclaimer.
-# 
-# 2. Redistributions in binary form must reproduce the above copyright notice, this list
-#    of conditions and the following disclaimer in the documentation and/or other
-#    materials provided with the distribution.
-# 
-# 3. Neither the name of the copyright holder nor the names of its contributors may be
-#    used to endorse or promote products derived from this software without specific
-#    prior written permission.
-# 
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
-# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
-# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
-# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-if(FREEBSD)
-  set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DMDB_DSYNC=O_SYNC")
-endif()
-
-# pass the VL32 flag so that we actually invoke the VL32 extensions
-set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DVL32")
-
-set (lmdb_sources
-mdb.c
-midl.c)
-
-include_directories("${CMAKE_CURRENT_SOURCE_DIR}")
-
-add_library(lmdb
-  ${lmdb_sources})
-target_link_libraries(lmdb
-  LINK_PRIVATE
-    ${CMAKE_THREAD_LIBS_INIT})
--- a/external/db_drivers/liblmdb32/Doxyfile
+++ b/external/db_drivers/liblmdb32/Doxyfile
--- a/external/db_drivers/liblmdb32/mdb_load.1
+++ b/external/db_drivers/liblmdb32/mdb_load.1
@ -1,77 +0,0 @@
-.TH MDB_LOAD 1 "2014/06/20" "LMDB 0.9.14"
-.\" Copyright 2014-2015 Howard Chu, Symas Corp. All Rights Reserved.
-.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.SH NAME
-mdb_load \- LMDB environment import tool
-.SH SYNOPSIS
-.B mdb_load
-.BR \ envpath
-[\c
-.BR \-V ]
-[\c
-.BI \-f \ file\fR]
-[\c
-.BR \-n ]
-[\c
-.BI \-s \ subdb\fR]
-[\c
-.BR \-N ]
-[\c
-.BR \-T ]
-.SH DESCRIPTION
-The
-.B mdb_load
-utility reads from the standard input and loads it into the
-LMDB environment
-.BR envpath .
-
-The input to
-.B mdb_load
-must be in the output format specified by the
-.BR mdb_dump (1)
-utility or as specified by the
-.B -T
-option below.
-.SH OPTIONS
-.TP
-.BR \-V
-Write the library version number to the standard output, and exit.
-.TP
-.BR \-f \ file
-Read from the specified file instead of from the standard input.
-.TP
-.BR \-n
-Load an LMDB database which does not use subdirectories.
-.TP
-.BR \-s \ subdb
-Load a specific subdatabase. If no database is specified, data is loaded into the main database.
-.TP
-.BR \-N
-Don't overwrite existing records when loading into an already existing database; just skip them.
-.TP
-.BR \-T
-Load data from simple text files. The input must be paired lines of text, where the first
-line of the pair is the key item, and the second line of the pair is its corresponding
-data item.
-
-A simple escape mechanism, where newline and backslash (\\) characters are special, is
-applied to the text input. Newline characters are interpreted as record separators.
-Backslash characters in the text will be interpreted in one of two ways: If the backslash
-character precedes another backslash character, the pair will be interpreted as a literal
-backslash. If the backslash character precedes any other character, the two characters
-following the backslash will be interpreted as a hexadecimal specification of a single
-character; for example, \\0a is a newline character in the ASCII character set.
-
-For this reason, any backslash or newline characters that naturally occur in the text
-input must be escaped to avoid misinterpretation by
-.BR mdb_load . 
-
-.SH DIAGNOSTICS
-Exit status is zero if no errors occur.
-Errors result in a non-zero exit status and
-a diagnostic message being written to standard error.
-
-.SH "SEE ALSO"
-.BR mdb_dump (1)
-.SH AUTHOR
-Howard Chu of Symas Corporation <http://www.symas.com>
--- a/external/db_drivers/liblmdb32/mdb_stat.1
+++ b/external/db_drivers/liblmdb32/mdb_stat.1
@ -1,64 +0,0 @@
-.TH MDB_STAT 1 "2014/06/20" "LMDB 0.9.14"
-.\" Copyright 2012-2015 Howard Chu, Symas Corp. All Rights Reserved.
-.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.SH NAME
-mdb_stat \- LMDB environment status tool
-.SH SYNOPSIS
-.B mdb_stat
-.BR \ envpath
-[\c
-.BR \-V ]
-[\c
-.BR \-e ]
-[\c
-.BR \-f [ f [ f ]]]
-[\c
-.BR \-n ]
-[\c
-.BR \-r [ r ]]
-[\c
-.BR \-a \ |
-.BI \-s \ subdb\fR]
-.SH DESCRIPTION
-The
-.B mdb_stat
-utility displays the status of an LMDB environment.
-.SH OPTIONS
-.TP
-.BR \-V
-Write the library version number to the standard output, and exit.
-.TP
-.BR \-e
-Display information about the database environment.
-.TP
-.BR \-f
-Display information about the environment freelist.
-If \fB\-ff\fP is given, summarize each freelist entry.
-If \fB\-fff\fP is given, display the full list of page IDs in the freelist.
-.TP
-.BR \-n
-Display the status of an LMDB database which does not use subdirectories.
-.TP
-.BR \-r
-Display information about the environment reader table.
-Shows the process ID, thread ID, and transaction ID for each active
-reader slot. The process ID and transaction ID are in decimal, the
-thread ID is in hexadecimal. The transaction ID is displayed as "-"
-if the reader does not currently have a read transaction open.
-If \fB\-rr\fP is given, check for stale entries in the reader
-table and clear them. The reader table will be printed again
-after the check is performed.
-.TP
-.BR \-a
-Display the status of all of the subdatabases in the environment.
-.TP
-.BR \-s \ subdb
-Display the status of a specific subdatabase.
-.SH DIAGNOSTICS
-Exit status is zero if no errors occur.
-Errors result in a non-zero exit status and
-a diagnostic message being written to standard error.
-.SH "SEE ALSO"
-.BR mdb_copy (1)
-.SH AUTHOR
-Howard Chu of Symas Corporation <http://www.symas.com>
--- a/external/db_drivers/liblmdb32/mdb_stat.c
+++ b/external/db_drivers/liblmdb32/mdb_stat.c
@ -1,263 +0,0 @@
-/* mdb_stat.c - memory-mapped database status tool */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include "lmdb.h"
-
-#ifdef	_WIN32
-#define	Z	"I"
-#else
-#define	Z	"z"
-#endif
-
-static void prstat(MDB_stat *ms)
-{
-#if 0
-	printf("  Page size: %u\n", ms->ms_psize);
-#endif
-	printf("  Tree depth: %u\n", ms->ms_depth);
-	printf("  Branch pages: %"Z"u\n", ms->ms_branch_pages);
-	printf("  Leaf pages: %"Z"u\n", ms->ms_leaf_pages);
-	printf("  Overflow pages: %"Z"u\n", ms->ms_overflow_pages);
-	printf("  Entries: %"Z"u\n", ms->ms_entries);
-}
-
-static void usage(char *prog)
-{
-	fprintf(stderr, "usage: %s dbpath [-V] [-n] [-e] [-r[r]] [-f[f[f]]] [-a|-s subdb]\n", prog);
-	exit(EXIT_FAILURE);
-}
-
-int main(int argc, char *argv[])
-{
-	int i, rc;
-	MDB_env *env;
-	MDB_txn *txn;
-	MDB_dbi dbi;
-	MDB_stat mst;
-	MDB_envinfo mei;
-	char *prog = argv[0];
-	char *envname;
-	char *subname = NULL;
-	int alldbs = 0, envinfo = 0, envflags = 0, freinfo = 0, rdrinfo = 0;
-
-	if (argc < 2) {
-		usage(prog);
-	}
-
-	/* -a: print stat of main DB and all subDBs
-	 * -s: print stat of only the named subDB
-	 * -e: print env info
-	 * -f: print freelist info
-	 * -r: print reader info
-	 * -n: use NOSUBDIR flag on env_open
-	 * -V: print version and exit
-	 * (default) print stat of only the main DB
-	 */
-	while ((i = getopt(argc, argv, "Vaefnrs:")) != EOF) {
-		switch(i) {
-		case 'V':
-			printf("%s\n", MDB_VERSION_STRING);
-			exit(0);
-			break;
-		case 'a':
-			if (subname)
-				usage(prog);
-			alldbs++;
-			break;
-		case 'e':
-			envinfo++;
-			break;
-		case 'f':
-			freinfo++;
-			break;
-		case 'n':
-			envflags |= MDB_NOSUBDIR;
-			break;
-		case 'r':
-			rdrinfo++;
-			break;
-		case 's':
-			if (alldbs)
-				usage(prog);
-			subname = optarg;
-			break;
-		default:
-			usage(prog);
-		}
-	}
-
-	if (optind != argc - 1)
-		usage(prog);
-
-	envname = argv[optind];
-	rc = mdb_env_create(&env);
-	if (rc) {
-		fprintf(stderr, "mdb_env_create failed, error %d %s\n", rc, mdb_strerror(rc));
-		return EXIT_FAILURE;
-	}
-
-	if (alldbs || subname) {
-		mdb_env_set_maxdbs(env, 4);
-	}
-
-	rc = mdb_env_open(env, envname, envflags | MDB_RDONLY, 0664);
-	if (rc) {
-		fprintf(stderr, "mdb_env_open failed, error %d %s\n", rc, mdb_strerror(rc));
-		goto env_close;
-	}
-
-	if (envinfo) {
-		(void)mdb_env_stat(env, &mst);
-		(void)mdb_env_info(env, &mei);
-		printf("Environment Info\n");
-		printf("  Map address: %p\n", mei.me_mapaddr);
-		printf("  Map size: %"Z"u\n", mei.me_mapsize);
-		printf("  Page size: %u\n", mst.ms_psize);
-		printf("  Max pages: %"Z"u\n", mei.me_mapsize / mst.ms_psize);
-		printf("  Number of pages used: %"Z"u\n", mei.me_last_pgno+1);
-		printf("  Last transaction ID: %"Z"u\n", mei.me_last_txnid);
-		printf("  Max readers: %u\n", mei.me_maxreaders);
-		printf("  Number of readers used: %u\n", mei.me_numreaders);
-	}
-
-	if (rdrinfo) {
-		printf("Reader Table Status\n");
-		rc = mdb_reader_list(env, (MDB_msg_func *)fputs, stdout);
-		if (rdrinfo > 1) {
-			int dead;
-			mdb_reader_check(env, &dead);
-			printf("  %d stale readers cleared.\n", dead);
-			rc = mdb_reader_list(env, (MDB_msg_func *)fputs, stdout);
-		}
-		if (!(subname || alldbs || freinfo))
-			goto env_close;
-	}
-
-	rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
-	if (rc) {
-		fprintf(stderr, "mdb_txn_begin failed, error %d %s\n", rc, mdb_strerror(rc));
-		goto env_close;
-	}
-
-	if (freinfo) {
-		MDB_cursor *cursor;
-		MDB_val key, data;
-		size_t pages = 0, *iptr;
-
-		printf("Freelist Status\n");
-		dbi = 0;
-		rc = mdb_cursor_open(txn, dbi, &cursor);
-		if (rc) {
-			fprintf(stderr, "mdb_cursor_open failed, error %d %s\n", rc, mdb_strerror(rc));
-			goto txn_abort;
-		}
-		rc = mdb_stat(txn, dbi, &mst);
-		if (rc) {
-			fprintf(stderr, "mdb_stat failed, error %d %s\n", rc, mdb_strerror(rc));
-			goto txn_abort;
-		}
-		prstat(&mst);
-		while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-			iptr = data.mv_data;
-			pages += *iptr;
-			if (freinfo > 1) {
-				char *bad = "";
-				size_t pg, prev;
-				ssize_t i, j, span = 0;
-				j = *iptr++;
-				for (i = j, prev = 1; --i >= 0; ) {
-					pg = iptr[i];
-					if (pg <= prev)
-						bad = " [bad sequence]";
-					prev = pg;
-					pg += span;
-					for (; i >= span && iptr[i-span] == pg; span++, pg++) ;
-				}
-				printf("    Transaction %"Z"u, %"Z"d pages, maxspan %"Z"d%s\n",
-					*(size_t *)key.mv_data, j, span, bad);
-				if (freinfo > 2) {
-					for (--j; j >= 0; ) {
-						pg = iptr[j];
-						for (span=1; --j >= 0 && iptr[j] == pg+span; span++) ;
-						printf(span>1 ? "     %9"Z"u[%"Z"d]\n" : "     %9"Z"u\n",
-							pg, span);
-					}
-				}
-			}
-		}
-		mdb_cursor_close(cursor);
-		printf("  Free pages: %"Z"u\n", pages);
-	}
-
-	rc = mdb_open(txn, subname, 0, &dbi);
-	if (rc) {
-		fprintf(stderr, "mdb_open failed, error %d %s\n", rc, mdb_strerror(rc));
-		goto txn_abort;
-	}
-
-	rc = mdb_stat(txn, dbi, &mst);
-	if (rc) {
-		fprintf(stderr, "mdb_stat failed, error %d %s\n", rc, mdb_strerror(rc));
-		goto txn_abort;
-	}
-	printf("Status of %s\n", subname ? subname : "Main DB");
-	prstat(&mst);
-
-	if (alldbs) {
-		MDB_cursor *cursor;
-		MDB_val key;
-
-		rc = mdb_cursor_open(txn, dbi, &cursor);
-		if (rc) {
-			fprintf(stderr, "mdb_cursor_open failed, error %d %s\n", rc, mdb_strerror(rc));
-			goto txn_abort;
-		}
-		while ((rc = mdb_cursor_get(cursor, &key, NULL, MDB_NEXT_NODUP)) == 0) {
-			char *str;
-			MDB_dbi db2;
-			if (memchr(key.mv_data, '\0', key.mv_size))
-				continue;
-			str = malloc(key.mv_size+1);
-			memcpy(str, key.mv_data, key.mv_size);
-			str[key.mv_size] = '\0';
-			rc = mdb_open(txn, str, 0, &db2);
-			if (rc == MDB_SUCCESS)
-				printf("Status of %s\n", str);
-			free(str);
-			if (rc) continue;
-			rc = mdb_stat(txn, db2, &mst);
-			if (rc) {
-				fprintf(stderr, "mdb_stat failed, error %d %s\n", rc, mdb_strerror(rc));
-				goto txn_abort;
-			}
-			prstat(&mst);
-			mdb_close(env, db2);
-		}
-		mdb_cursor_close(cursor);
-	}
-
-	if (rc == MDB_NOTFOUND)
-		rc = MDB_SUCCESS;
-
-	mdb_close(env, dbi);
-txn_abort:
-	mdb_txn_abort(txn);
-env_close:
-	mdb_env_close(env);
-
-	return rc ? EXIT_FAILURE : EXIT_SUCCESS;
-}
--- a/external/db_drivers/liblmdb32/midl.c
+++ b/external/db_drivers/liblmdb32/midl.c
@ -1,360 +0,0 @@
-/**	@file midl.c
- *	@brief ldap bdb back-end ID List functions */
-/* $OpenLDAP$ */
-/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
- *
- * Copyright 2000-2015 The OpenLDAP Foundation.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-#include <limits.h>
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/types.h>
-#include "midl.h"
-
-/** @defgroup internal	LMDB Internals
- *	@{
- */
-/** @defgroup idls	ID List Management
- *	@{
- */
-#define CMP(x,y)	 ( (x) < (y) ? -1 : (x) > (y) )
-
-unsigned mdb_midl_search( MDB_IDL ids, MDB_ID id )
-{
-	/*
-	 * binary search of id in ids
-	 * if found, returns position of id
-	 * if not found, returns first position greater than id
-	 */
-	unsigned base = 0;
-	unsigned cursor = 1;
-	int val = 0;
-	unsigned n = ids[0];
-
-	while( 0 < n ) {
-		unsigned pivot = n >> 1;
-		cursor = base + pivot + 1;
-		val = CMP( ids[cursor], id );
-
-		if( val < 0 ) {
-			n = pivot;
-
-		} else if ( val > 0 ) {
-			base = cursor;
-			n -= pivot + 1;
-
-		} else {
-			return cursor;
-		}
-	}
-
-	if( val > 0 ) {
-		++cursor;
-	}
-	return cursor;
-}
-
-#if 0	/* superseded by append/sort */
-int mdb_midl_insert( MDB_IDL ids, MDB_ID id )
-{
-	unsigned x, i;
-
-	x = mdb_midl_search( ids, id );
-	assert( x > 0 );
-
-	if( x < 1 ) {
-		/* internal error */
-		return -2;
-	}
-
-	if ( x <= ids[0] && ids[x] == id ) {
-		/* duplicate */
-		assert(0);
-		return -1;
-	}
-
-	if ( ++ids[0] >= MDB_IDL_DB_MAX ) {
-		/* no room */
-		--ids[0];
-		return -2;
-
-	} else {
-		/* insert id */
-		for (i=ids[0]; i>x; i--)
-			ids[i] = ids[i-1];
-		ids[x] = id;
-	}
-
-	return 0;
-}
-#endif
-
-MDB_IDL mdb_midl_alloc(int num)
-{
-	MDB_IDL ids = malloc((num+2) * sizeof(MDB_ID));
-	if (ids) {
-		*ids++ = num;
-		*ids = 0;
-	}
-	return ids;
-}
-
-void mdb_midl_free(MDB_IDL ids)
-{
-	if (ids)
-		free(ids-1);
-}
-
-int mdb_midl_shrink( MDB_IDL *idp )
-{
-	MDB_IDL ids = *idp;
-	if (*(--ids) > MDB_IDL_UM_MAX &&
-		(ids = realloc(ids, (MDB_IDL_UM_MAX+1) * sizeof(MDB_ID))))
-	{
-		*ids++ = MDB_IDL_UM_MAX;
-		*idp = ids;
-		return 1;
-	}
-	return 0;
-}
-
-static int mdb_midl_grow( MDB_IDL *idp, int num )
-{
-	MDB_IDL idn = *idp-1;
-	/* grow it */
-	idn = realloc(idn, (*idn + num + 2) * sizeof(MDB_ID));
-	if (!idn)
-		return ENOMEM;
-	*idn++ += num;
-	*idp = idn;
-	return 0;
-}
-
-int mdb_midl_need( MDB_IDL *idp, unsigned num )
-{
-	MDB_IDL ids = *idp;
-	num += ids[0];
-	if (num > ids[-1]) {
-		num = (num + num/4 + (256 + 2)) & -256;
-		if (!(ids = realloc(ids-1, num * sizeof(MDB_ID))))
-			return ENOMEM;
-		*ids++ = num - 2;
-		*idp = ids;
-	}
-	return 0;
-}
-
-int mdb_midl_append( MDB_IDL *idp, MDB_ID id )
-{
-	MDB_IDL ids = *idp;
-	/* Too big? */
-	if (ids[0] >= ids[-1]) {
-		if (mdb_midl_grow(idp, MDB_IDL_UM_MAX))
-			return ENOMEM;
-		ids = *idp;
-	}
-	ids[0]++;
-	ids[ids[0]] = id;
-	return 0;
-}
-
-int mdb_midl_append_list( MDB_IDL *idp, MDB_IDL app )
-{
-	MDB_IDL ids = *idp;
-	/* Too big? */
-	if (ids[0] + app[0] >= ids[-1]) {
-		if (mdb_midl_grow(idp, app[0]))
-			return ENOMEM;
-		ids = *idp;
-	}
-	memcpy(&ids[ids[0]+1], &app[1], app[0] * sizeof(MDB_ID));
-	ids[0] += app[0];
-	return 0;
-}
-
-int mdb_midl_append_range( MDB_IDL *idp, MDB_ID id, unsigned n )
-{
-	MDB_ID *ids = *idp, len = ids[0];
-	/* Too big? */
-	if (len + n > ids[-1]) {
-		if (mdb_midl_grow(idp, n | MDB_IDL_UM_MAX))
-			return ENOMEM;
-		ids = *idp;
-	}
-	ids[0] = len + n;
-	ids += len;
-	while (n)
-		ids[n--] = id++;
-	return 0;
-}
-
-void mdb_midl_xmerge( MDB_IDL idl, MDB_IDL merge )
-{
-	MDB_ID old_id, merge_id, i = merge[0], j = idl[0], k = i+j, total = k;
-	idl[0] = (MDB_ID)-1;		/* delimiter for idl scan below */
-	old_id = idl[j];
-	while (i) {
-		merge_id = merge[i--];
-		for (; old_id < merge_id; old_id = idl[--j])
-			idl[k--] = old_id;
-		idl[k--] = merge_id;
-	}
-	idl[0] = total;
-}
-
-/* Quicksort + Insertion sort for small arrays */
-
-#define SMALL	8
-#define	MIDL_SWAP(a,b)	{ itmp=(a); (a)=(b); (b)=itmp; }
-
-void
-mdb_midl_sort( MDB_IDL ids )
-{
-	/* Max possible depth of int-indexed tree * 2 items/level */
-	int istack[sizeof(int)*CHAR_BIT * 2];
-	int i,j,k,l,ir,jstack;
-	MDB_ID a, itmp;
-
-	ir = (int)ids[0];
-	l = 1;
-	jstack = 0;
-	for(;;) {
-		if (ir - l < SMALL) {	/* Insertion sort */
-			for (j=l+1;j<=ir;j++) {
-				a = ids[j];
-				for (i=j-1;i>=1;i--) {
-					if (ids[i] >= a) break;
-					ids[i+1] = ids[i];
-				}
-				ids[i+1] = a;
-			}
-			if (jstack == 0) break;
-			ir = istack[jstack--];
-			l = istack[jstack--];
-		} else {
-			k = (l + ir) >> 1;	/* Choose median of left, center, right */
-			MIDL_SWAP(ids[k], ids[l+1]);
-			if (ids[l] < ids[ir]) {
-				MIDL_SWAP(ids[l], ids[ir]);
-			}
-			if (ids[l+1] < ids[ir]) {
-				MIDL_SWAP(ids[l+1], ids[ir]);
-			}
-			if (ids[l] < ids[l+1]) {
-				MIDL_SWAP(ids[l], ids[l+1]);
-			}
-			i = l+1;
-			j = ir;
-			a = ids[l+1];
-			for(;;) {
-				do i++; while(ids[i] > a);
-				do j--; while(ids[j] < a);
-				if (j < i) break;
-				MIDL_SWAP(ids[i],ids[j]);
-			}
-			ids[l+1] = ids[j];
-			ids[j] = a;
-			jstack += 2;
-			if (ir-i+1 >= j-l) {
-				istack[jstack] = ir;
-				istack[jstack-1] = i;
-				ir = j-1;
-			} else {
-				istack[jstack] = j-1;
-				istack[jstack-1] = l;
-				l = i;
-			}
-		}
-	}
-}
-
-unsigned mdb_mid2l_search( MDB_ID2L ids, MDB_ID id )
-{
-	/*
-	 * binary search of id in ids
-	 * if found, returns position of id
-	 * if not found, returns first position greater than id
-	 */
-	unsigned base = 0;
-	unsigned cursor = 1;
-	int val = 0;
-	unsigned n = (unsigned)ids[0].mid;
-
-	while( 0 < n ) {
-		unsigned pivot = n >> 1;
-		cursor = base + pivot + 1;
-		val = CMP( id, ids[cursor].mid );
-
-		if( val < 0 ) {
-			n = pivot;
-
-		} else if ( val > 0 ) {
-			base = cursor;
-			n -= pivot + 1;
-
-		} else {
-			return cursor;
-		}
-	}
-
-	if( val > 0 ) {
-		++cursor;
-	}
-	return cursor;
-}
-
-int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id )
-{
-	unsigned x, i;
-
-	x = mdb_mid2l_search( ids, id->mid );
-
-	if( x < 1 ) {
-		/* internal error */
-		return -2;
-	}
-
-	if ( x <= ids[0].mid && ids[x].mid == id->mid ) {
-		/* duplicate */
-		return -1;
-	}
-
-	if ( ids[0].mid >= MDB_IDL_UM_MAX ) {
-		/* too big */
-		return -2;
-
-	} else {
-		/* insert id */
-		ids[0].mid++;
-		for (i=(unsigned)ids[0].mid; i>x; i--)
-			ids[i] = ids[i-1];
-		ids[x] = *id;
-	}
-
-	return 0;
-}
-
-int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id )
-{
-	/* Too big? */
-	if (ids[0].mid >= MDB_IDL_UM_MAX) {
-		return -2;
-	}
-	ids[0].mid++;
-	ids[ids[0].mid] = *id;
-	return 0;
-}
-
-/** @} */
-/** @} */
--- a/external/db_drivers/liblmdb32/mtest.c
+++ b/external/db_drivers/liblmdb32/mtest.c
@ -1,177 +0,0 @@
-/* mtest.c - memory-mapped database tester/toy */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
-#include "lmdb.h"
-
-#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
-#define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0))
-#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
-	"%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))
-
-int main(int argc,char * argv[])
-{
-	int i = 0, j = 0, rc;
-	MDB_env *env;
-	MDB_dbi dbi;
-	MDB_val key, data;
-	MDB_txn *txn;
-	MDB_stat mst;
-	MDB_cursor *cursor, *cur2;
-	MDB_cursor_op op;
-	int count;
-	int *values;
-	char sval[32] = "";
-
-	srand(time(NULL));
-
-	    count = (rand()%384) + 64;
-	    values = (int *)malloc(count*sizeof(int));
-
-	    for(i = 0;i<count;i++) {
-			values[i] = rand()%1024;
-	    }
-    
-		E(mdb_env_create(&env));
-		E(mdb_env_set_maxreaders(env, 1));
-		E(mdb_env_set_mapsize(env, 10485760));
-		E(mdb_env_open(env, "./testdb", 0 /* MDB_FIXEDMAP |MDB_NOSYNC*/, 0664));
-
-		E(mdb_txn_begin(env, NULL, 0, &txn));
-		E(mdb_dbi_open(txn, NULL, 0, &dbi));
-   
-		key.mv_size = sizeof(int);
-		key.mv_data = sval;
-
-		printf("Adding %d values\n", count);
-	    for (i=0;i<count;i++) {	
-			sprintf(sval, "%03x %d foo bar", values[i], values[i]);
-			/* Set <data> in each iteration, since MDB_NOOVERWRITE may modify it */
-			data.mv_size = sizeof(sval);
-			data.mv_data = sval;
-			if (RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NOOVERWRITE))) {
-				j++;
-				data.mv_size = sizeof(sval);
-				data.mv_data = sval;
-			}
-	    }
-		if (j) printf("%d duplicates skipped\n", j);
-		E(mdb_txn_commit(txn));
-		E(mdb_env_stat(env, &mst));
-
-		E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-		E(mdb_cursor_open(txn, dbi, &cursor));
-		while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-			printf("key: %p %.*s, data: %p %.*s\n",
-				key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-				data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-		}
-		CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-		mdb_cursor_close(cursor);
-		mdb_txn_abort(txn);
-
-		j=0;
-		key.mv_data = sval;
-	    for (i= count - 1; i > -1; i-= (rand()%5)) {
-			j++;
-			txn=NULL;
-			E(mdb_txn_begin(env, NULL, 0, &txn));
-			sprintf(sval, "%03x ", values[i]);
-			if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, NULL))) {
-				j--;
-				mdb_txn_abort(txn);
-			} else {
-				E(mdb_txn_commit(txn));
-			}
-	    }
-	    free(values);
-		printf("Deleted %d values\n", j);
-
-		E(mdb_env_stat(env, &mst));
-		E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-		E(mdb_cursor_open(txn, dbi, &cursor));
-		printf("Cursor next\n");
-		while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-			printf("key: %.*s, data: %.*s\n",
-				(int) key.mv_size,  (char *) key.mv_data,
-				(int) data.mv_size, (char *) data.mv_data);
-		}
-		CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-		printf("Cursor last\n");
-		E(mdb_cursor_get(cursor, &key, &data, MDB_LAST));
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-		printf("Cursor prev\n");
-		while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
-			printf("key: %.*s, data: %.*s\n",
-				(int) key.mv_size,  (char *) key.mv_data,
-				(int) data.mv_size, (char *) data.mv_data);
-		}
-		CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-		printf("Cursor last/prev\n");
-		E(mdb_cursor_get(cursor, &key, &data, MDB_LAST));
-			printf("key: %.*s, data: %.*s\n",
-				(int) key.mv_size,  (char *) key.mv_data,
-				(int) data.mv_size, (char *) data.mv_data);
-		E(mdb_cursor_get(cursor, &key, &data, MDB_PREV));
-			printf("key: %.*s, data: %.*s\n",
-				(int) key.mv_size,  (char *) key.mv_data,
-				(int) data.mv_size, (char *) data.mv_data);
-
-		mdb_cursor_close(cursor);
-		mdb_txn_abort(txn);
-
-		printf("Deleting with cursor\n");
-		E(mdb_txn_begin(env, NULL, 0, &txn));
-		E(mdb_cursor_open(txn, dbi, &cur2));
-		for (i=0; i<50; i++) {
-			if (RES(MDB_NOTFOUND, mdb_cursor_get(cur2, &key, &data, MDB_NEXT)))
-				break;
-			printf("key: %p %.*s, data: %p %.*s\n",
-				key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-				data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-			E(mdb_del(txn, dbi, &key, NULL));
-		}
-
-		printf("Restarting cursor in txn\n");
-		for (op=MDB_FIRST, i=0; i<=32; op=MDB_NEXT, i++) {
-			if (RES(MDB_NOTFOUND, mdb_cursor_get(cur2, &key, &data, op)))
-				break;
-			printf("key: %p %.*s, data: %p %.*s\n",
-				key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-				data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-		}
-		mdb_cursor_close(cur2);
-		E(mdb_txn_commit(txn));
-
-		printf("Restarting cursor outside txn\n");
-		E(mdb_txn_begin(env, NULL, 0, &txn));
-		E(mdb_cursor_open(txn, dbi, &cursor));
-		for (op=MDB_FIRST, i=0; i<=32; op=MDB_NEXT, i++) {
-			if (RES(MDB_NOTFOUND, mdb_cursor_get(cursor, &key, &data, op)))
-				break;
-			printf("key: %p %.*s, data: %p %.*s\n",
-				key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-				data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-		}
-		mdb_cursor_close(cursor);
-		mdb_txn_abort(txn);
-
-		mdb_dbi_close(env, dbi);
-		mdb_env_close(env);
-
-	return 0;
-}
--- a/external/db_drivers/liblmdb64/COPYRIGHT
+++ b/external/db_drivers/liblmdb64/COPYRIGHT
@ -1,20 +0,0 @@
-Copyright 2011-2015 Howard Chu, Symas Corp.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted only as authorized by the OpenLDAP
-Public License.
-
-A copy of this license is available in the file LICENSE in the
-top-level directory of the distribution or, alternatively, at
-<http://www.OpenLDAP.org/license.html>.
-
-OpenLDAP is a registered trademark of the OpenLDAP Foundation.
-
-Individual files and/or contributed packages may be copyright by
-other parties and/or subject to additional restrictions.
-
-This work also contains materials derived from public sources.
-
-Additional information about OpenLDAP can be obtained at
-<http://www.openldap.org/>.
--- a/external/db_drivers/liblmdb64/LICENSE
+++ b/external/db_drivers/liblmdb64/LICENSE
@ -1,47 +0,0 @@
-The OpenLDAP Public License
-  Version 2.8, 17 August 2003
-
-Redistribution and use of this software and associated documentation
-("Software"), with or without modification, are permitted provided
-that the following conditions are met:
-
-1. Redistributions in source form must retain copyright statements
-   and notices,
-
-2. Redistributions in binary form must reproduce applicable copyright
-   statements and notices, this list of conditions, and the following
-   disclaimer in the documentation and/or other materials provided
-   with the distribution, and
-
-3. Redistributions must contain a verbatim copy of this document.
-
-The OpenLDAP Foundation may revise this license from time to time.
-Each revision is distinguished by a version number.  You may use
-this Software under terms of this license revision or under the
-terms of any subsequent revision of the license.
-
-THIS SOFTWARE IS PROVIDED BY THE OPENLDAP FOUNDATION AND ITS
-CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
-INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
-AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT
-SHALL THE OPENLDAP FOUNDATION, ITS CONTRIBUTORS, OR THE AUTHOR(S)
-OR OWNER(S) OF THE SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
-INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
-
-The names of the authors and copyright holders must not be used in
-advertising or otherwise to promote the sale, use or other dealing
-in this Software without specific, written prior permission.  Title
-to copyright in this Software shall at all times remain with copyright
-holders.
-
-OpenLDAP is a registered trademark of the OpenLDAP Foundation.
-
-Copyright 1999-2003 The OpenLDAP Foundation, Redwood City,
-California, USA.  All Rights Reserved.  Permission to copy and
-distribute verbatim copies of this document is granted.
--- a/external/db_drivers/liblmdb64/Makefile
+++ b/external/db_drivers/liblmdb64/Makefile
@ -1,104 +0,0 @@
-# Makefile for liblmdb (Lightning memory-mapped database library).
-
-########################################################################
-# Configuration. The compiler options must enable threaded compilation.
-#
-# Preprocessor macros (for CPPFLAGS) of interest...
-# Note that the defaults should already be correct for most
-# platforms; you should not need to change any of these.
-# Read their descriptions in mdb.c if you do:
-#
-# - MDB_USE_POSIX_SEM
-# - MDB_DSYNC
-# - MDB_FDATASYNC
-# - MDB_FDATASYNC_WORKS
-# - MDB_USE_PWRITEV
-#
-# There may be other macros in mdb.c of interest. You should
-# read mdb.c before changing any of them.
-#
-CC	= gcc
-W	= -W -Wall -Wno-unused-parameter -Wbad-function-cast -Wuninitialized
-THREADS = -pthread
-OPT = -O2 -g
-CFLAGS	= $(THREADS) $(OPT) $(W) $(XCFLAGS)
-LDLIBS	=
-SOLIBS	=
-prefix	= /usr/local
-
-########################################################################
-
-IHDRS	= lmdb.h
-ILIBS	= liblmdb.a liblmdb.so
-IPROGS	= mdb_stat mdb_copy mdb_dump mdb_load
-IDOCS	= mdb_stat.1 mdb_copy.1 mdb_dump.1 mdb_load.1
-PROGS	= $(IPROGS) mtest mtest2 mtest3 mtest4 mtest5
-all:	$(ILIBS) $(PROGS)
-
-install: $(ILIBS) $(IPROGS) $(IHDRS)
-	for f in $(IPROGS); do cp $$f $(DESTDIR)$(prefix)/bin; done
-	for f in $(ILIBS); do cp $$f $(DESTDIR)$(prefix)/lib; done
-	for f in $(IHDRS); do cp $$f $(DESTDIR)$(prefix)/include; done
-	for f in $(IDOCS); do cp $$f $(DESTDIR)$(prefix)/man/man1; done
-
-clean:
-	rm -rf $(PROGS) *.[ao] *.[ls]o *~ testdb
-
-test:	all
-	rm -rf testdb && mkdir testdb
-	./mtest && ./mdb_stat testdb
-
-liblmdb.a:	mdb.o midl.o
-	ar rs $@ mdb.o midl.o
-
-liblmdb.so:	mdb.lo midl.lo
-#	$(CC) $(LDFLAGS) -pthread -shared -Wl,-Bsymbolic -o $@ mdb.o midl.o $(SOLIBS)
-	$(CC) $(LDFLAGS) -pthread -shared -o $@ mdb.lo midl.lo $(SOLIBS)
-
-mdb_stat: mdb_stat.o liblmdb.a
-mdb_copy: mdb_copy.o liblmdb.a
-mdb_dump: mdb_dump.o liblmdb.a
-mdb_load: mdb_load.o liblmdb.a
-mtest:    mtest.o    liblmdb.a
-mtest2:	mtest2.o liblmdb.a
-mtest3:	mtest3.o liblmdb.a
-mtest4:	mtest4.o liblmdb.a
-mtest5:	mtest5.o liblmdb.a
-mtest6:	mtest6.o liblmdb.a
-
-mdb.o: mdb.c lmdb.h midl.h
-	$(CC) $(CFLAGS) $(CPPFLAGS) -c mdb.c
-
-midl.o: midl.c midl.h
-	$(CC) $(CFLAGS) $(CPPFLAGS) -c midl.c
-
-mdb.lo: mdb.c lmdb.h midl.h
-	$(CC) $(CFLAGS) -fPIC $(CPPFLAGS) -c mdb.c -o $@
-
-midl.lo: midl.c midl.h
-	$(CC) $(CFLAGS) -fPIC $(CPPFLAGS) -c midl.c -o $@
-
-%:	%.o
-	$(CC) $(CFLAGS) $(LDFLAGS) $^ $(LDLIBS) -o $@
-
-%.o:	%.c lmdb.h
-	$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
-
-COV_FLAGS=-fprofile-arcs -ftest-coverage
-COV_OBJS=xmdb.o xmidl.o
-
-coverage: xmtest
-	for i in mtest*.c [0-9]*.c; do j=`basename \$$i .c`; $(MAKE) $$j.o; \
-		gcc -o x$$j $$j.o $(COV_OBJS) -pthread $(COV_FLAGS); \
-		rm -rf testdb; mkdir testdb; ./x$$j; done
-	gcov xmdb.c
-	gcov xmidl.c
-
-xmtest:	mtest.o xmdb.o xmidl.o
-	gcc -o xmtest mtest.o xmdb.o xmidl.o -pthread $(COV_FLAGS)
-
-xmdb.o: mdb.c lmdb.h midl.h
-	$(CC) $(CFLAGS) -fPIC $(CPPFLAGS) -O0 $(COV_FLAGS) -c mdb.c -o $@
-
-xmidl.o: midl.c midl.h
-	$(CC) $(CFLAGS) -fPIC $(CPPFLAGS) -O0 $(COV_FLAGS) -c midl.c -o $@
--- a/external/db_drivers/liblmdb64/lmdb.h
+++ b/external/db_drivers/liblmdb64/lmdb.h
--- a/external/db_drivers/liblmdb64/mdb.c
+++ b/external/db_drivers/liblmdb64/mdb.c
--- a/external/db_drivers/liblmdb64/mdb_copy.1
+++ b/external/db_drivers/liblmdb64/mdb_copy.1
@ -1,54 +0,0 @@
-.TH MDB_COPY 1 "2014/06/20" "LMDB 0.9.14"
-.\" Copyright 2012-2015 Howard Chu, Symas Corp. All Rights Reserved.
-.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.SH NAME
-mdb_copy \- LMDB environment copy tool
-.SH SYNOPSIS
-.B mdb_copy
-[\c
-.BR \-V ]
-[\c
-.BR \-c ]
-[\c
-.BR \-n ]
-.B srcpath
-[\c
-.BR dstpath ]
-.SH DESCRIPTION
-The
-.B mdb_copy
-utility copies an LMDB environment. The environment can
-be copied regardless of whether it is currently in use.
-No lockfile is created, since it gets recreated at need.
-
-If
-.I dstpath
-is specified it must be the path of an empty directory
-for storing the backup. Otherwise, the backup will be
-written to stdout.
-
-.SH OPTIONS
-.TP
-.BR \-V
-Write the library version number to the standard output, and exit.
-.TP
-.BR \-c
-Compact while copying. Only current data pages will be copied; freed
-or unused pages will be omitted from the copy. This option will
-slow down the backup process as it is more CPU-intensive.
-.TP
-.BR \-n
-Open LDMB environment(s) which do not use subdirectories.
-
-.SH DIAGNOSTICS
-Exit status is zero if no errors occur.
-Errors result in a non-zero exit status and
-a diagnostic message being written to standard error.
-.SH CAVEATS
-This utility can trigger significant file size growth if run
-in parallel with write transactions, because pages which they
-free during copying cannot be reused until the copy is done.
-.SH "SEE ALSO"
-.BR mdb_stat (1)
-.SH AUTHOR
-Howard Chu of Symas Corporation <http://www.symas.com>
--- a/external/db_drivers/liblmdb64/mdb_copy.c
+++ b/external/db_drivers/liblmdb64/mdb_copy.c
@ -1,82 +0,0 @@
-/* mdb_copy.c - memory-mapped database backup tool */
-/*
- * Copyright 2012-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-#ifdef _WIN32
-#include <windows.h>
-#define	MDB_STDOUT	GetStdHandle(STD_OUTPUT_HANDLE)
-#else
-#define	MDB_STDOUT	1
-#endif
-#include <stdio.h>
-#include <stdlib.h>
-#include <signal.h>
-#include "lmdb.h"
-
-static void
-sighandle(int sig)
-{
-}
-
-int main(int argc,char * argv[])
-{
-	int rc;
-	MDB_env *env;
-	const char *progname = argv[0], *act;
-	unsigned flags = MDB_RDONLY;
-	unsigned cpflags = 0;
-
-	for (; argc > 1 && argv[1][0] == '-'; argc--, argv++) {
-		if (argv[1][1] == 'n' && argv[1][2] == '\0')
-			flags |= MDB_NOSUBDIR;
-		else if (argv[1][1] == 'c' && argv[1][2] == '\0')
-			cpflags |= MDB_CP_COMPACT;
-		else if (argv[1][1] == 'V' && argv[1][2] == '\0') {
-			printf("%s\n", MDB_VERSION_STRING);
-			exit(0);
-		} else
-			argc = 0;
-	}
-
-	if (argc<2 || argc>3) {
-		fprintf(stderr, "usage: %s [-V] [-c] [-n] srcpath [dstpath]\n", progname);
-		exit(EXIT_FAILURE);
-	}
-
-#ifdef SIGPIPE
-	signal(SIGPIPE, sighandle);
-#endif
-#ifdef SIGHUP
-	signal(SIGHUP, sighandle);
-#endif
-	signal(SIGINT, sighandle);
-	signal(SIGTERM, sighandle);
-
-	act = "opening environment";
-	rc = mdb_env_create(&env);
-	if (rc == MDB_SUCCESS) {
-		rc = mdb_env_open(env, argv[1], flags, 0600);
-	}
-	if (rc == MDB_SUCCESS) {
-		act = "copying";
-		if (argc == 2)
-			rc = mdb_env_copyfd2(env, MDB_STDOUT, cpflags);
-		else
-			rc = mdb_env_copy2(env, argv[2], cpflags);
-	}
-	if (rc)
-		fprintf(stderr, "%s: %s failed, error %d (%s)\n",
-			progname, act, rc, mdb_strerror(rc));
-	mdb_env_close(env);
-
-	return rc ? EXIT_FAILURE : EXIT_SUCCESS;
-}
--- a/external/db_drivers/liblmdb64/mdb_dump.1
+++ b/external/db_drivers/liblmdb64/mdb_dump.1
@ -1,75 +0,0 @@
-.TH MDB_DUMP 1 "2014/06/20" "LMDB 0.9.14"
-.\" Copyright 2014-2015 Howard Chu, Symas Corp. All Rights Reserved.
-.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.SH NAME
-mdb_dump \- LMDB environment export tool
-.SH SYNOPSIS
-.B mdb_dump
-.BR \ envpath
-[\c
-.BR \-V ]
-[\c
-.BI \-f \ file\fR]
-[\c
-.BR \-l ]
-[\c
-.BR \-n ]
-[\c
-.BR \-p ]
-[\c
-.BR \-a \ |
-.BI \-s \ subdb\fR]
-.SH DESCRIPTION
-The
-.B mdb_dump
-utility reads a database and writes its contents to the
-standard output using a portable flat-text format
-understood by the
-.BR mdb_load (1)
-utility.
-.SH OPTIONS
-.TP
-.BR \-V
-Write the library version number to the standard output, and exit.
-.TP
-.BR \-f \ file
-Write to the specified file instead of to the standard output.
-.TP
-.BR \-l
-List the databases stored in the environment. Just the
-names will be listed, no data will be output.
-.TP
-.BR \-n
-Dump an LMDB database which does not use subdirectories.
-.TP
-.BR \-p
-If characters in either the key or data items are printing characters (as
-defined by isprint(3)), output them directly. This option permits users to
-use standard text editors and tools to modify the contents of databases.
-
-Note: different systems may have different notions about what characters
-are considered printing characters, and databases dumped in this manner may
-be less portable to external systems. 
-.TP
-.BR \-a
-Dump all of the subdatabases in the environment.
-.TP
-.BR \-s \ subdb
-Dump a specific subdatabase. If no database is specified, only the main database is dumped.
-.SH DIAGNOSTICS
-Exit status is zero if no errors occur.
-Errors result in a non-zero exit status and
-a diagnostic message being written to standard error.
-
-Dumping and reloading databases that use user-defined comparison functions
-will result in new databases that use the default comparison functions.
-\fBIn this case it is quite likely that the reloaded database will be
-damaged beyond repair permitting neither record storage nor retrieval.\fP
-
-The only available workaround is to modify the source for the
-.BR mdb_load (1)
-utility to load the database using the correct comparison functions.
-.SH "SEE ALSO"
-.BR mdb_load (1)
-.SH AUTHOR
-Howard Chu of Symas Corporation <http://www.symas.com>
--- a/external/db_drivers/liblmdb64/mdb_dump.c
+++ b/external/db_drivers/liblmdb64/mdb_dump.c
@ -1,317 +0,0 @@
-/* mdb_dump.c - memory-mapped database dump tool */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-#include <stdio.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <unistd.h>
-#include <signal.h>
-#include "lmdb.h"
-
-#ifdef _WIN32
-#define Z	"I"
-#else
-#define Z	"z"
-#endif
-
-#define PRINT	1
-static int mode;
-
-typedef struct flagbit {
-	int bit;
-	char *name;
-} flagbit;
-
-flagbit dbflags[] = {
-	{ MDB_REVERSEKEY, "reversekey" },
-	{ MDB_DUPSORT, "dupsort" },
-	{ MDB_INTEGERKEY, "integerkey" },
-	{ MDB_DUPFIXED, "dupfixed" },
-	{ MDB_INTEGERDUP, "integerdup" },
-	{ MDB_REVERSEDUP, "reversedup" },
-	{ 0, NULL }
-};
-
-static volatile sig_atomic_t gotsig;
-
-static void dumpsig( int sig )
-{
-	gotsig=1;
-}
-
-static const char hexc[] = "0123456789abcdef";
-
-static void hex(unsigned char c)
-{
-	putchar(hexc[c >> 4]);
-	putchar(hexc[c & 0xf]);
-}
-
-static void text(MDB_val *v)
-{
-	unsigned char *c, *end;
-
-	putchar(' ');
-	c = v->mv_data;
-	end = c + v->mv_size;
-	while (c < end) {
-		if (isprint(*c)) {
-			putchar(*c);
-		} else {
-			putchar('\\');
-			hex(*c);
-		}
-		c++;
-	}
-	putchar('\n');
-}
-
-static void byte(MDB_val *v)
-{
-	unsigned char *c, *end;
-
-	putchar(' ');
-	c = v->mv_data;
-	end = c + v->mv_size;
-	while (c < end) {
-		hex(*c++);
-	}
-	putchar('\n');
-}
-
-/* Dump in BDB-compatible format */
-static int dumpit(MDB_txn *txn, MDB_dbi dbi, char *name)
-{
-	MDB_cursor *mc;
-	MDB_stat ms;
-	MDB_val key, data;
-	MDB_envinfo info;
-	unsigned int flags;
-	int rc, i;
-
-	rc = mdb_dbi_flags(txn, dbi, &flags);
-	if (rc) return rc;
-
-	rc = mdb_stat(txn, dbi, &ms);
-	if (rc) return rc;
-
-	rc = mdb_env_info(mdb_txn_env(txn), &info);
-	if (rc) return rc;
-
-	printf("VERSION=3\n");
-	printf("format=%s\n", mode & PRINT ? "print" : "bytevalue");
-	if (name)
-		printf("database=%s\n", name);
-	printf("type=btree\n");
-	printf("mapsize=%" Z "u\n", info.me_mapsize);
-	if (info.me_mapaddr)
-		printf("mapaddr=%p\n", info.me_mapaddr);
-	printf("maxreaders=%u\n", info.me_maxreaders);
-
-	if (flags & MDB_DUPSORT)
-		printf("duplicates=1\n");
-
-	for (i=0; dbflags[i].bit; i++)
-		if (flags & dbflags[i].bit)
-			printf("%s=1\n", dbflags[i].name);
-
-	printf("db_pagesize=%d\n", ms.ms_psize);
-	printf("HEADER=END\n");
-
-	rc = mdb_cursor_open(txn, dbi, &mc);
-	if (rc) return rc;
-
-	while ((rc = mdb_cursor_get(mc, &key, &data, MDB_NEXT) == MDB_SUCCESS)) {
-		if (gotsig) {
-			rc = EINTR;
-			break;
-		}
-		if (mode & PRINT) {
-			text(&key);
-			text(&data);
-		} else {
-			byte(&key);
-			byte(&data);
-		}
-	}
-	printf("DATA=END\n");
-	if (rc == MDB_NOTFOUND)
-		rc = MDB_SUCCESS;
-
-	return rc;
-}
-
-static void usage(char *prog)
-{
-	fprintf(stderr, "usage: %s dbpath [-V] [-f output] [-l] [-n] [-p] [-a|-s subdb]\n", prog);
-	exit(EXIT_FAILURE);
-}
-
-int main(int argc, char *argv[])
-{
-	int i, rc;
-	MDB_env *env;
-	MDB_txn *txn;
-	MDB_dbi dbi;
-	char *prog = argv[0];
-	char *envname;
-	char *subname = NULL;
-	int alldbs = 0, envflags = 0, list = 0;
-
-	if (argc < 2) {
-		usage(prog);
-	}
-
-	/* -a: dump main DB and all subDBs
-	 * -s: dump only the named subDB
-	 * -n: use NOSUBDIR flag on env_open
-	 * -p: use printable characters
-	 * -f: write to file instead of stdout
-	 * -V: print version and exit
-	 * (default) dump only the main DB
-	 */
-	while ((i = getopt(argc, argv, "af:lnps:V")) != EOF) {
-		switch(i) {
-		case 'V':
-			printf("%s\n", MDB_VERSION_STRING);
-			exit(0);
-			break;
-		case 'l':
-			list = 1;
-			/*FALLTHROUGH*/;
-		case 'a':
-			if (subname)
-				usage(prog);
-			alldbs++;
-			break;
-		case 'f':
-			if (freopen(optarg, "w", stdout) == NULL) {
-				fprintf(stderr, "%s: %s: reopen: %s\n",
-					prog, optarg, strerror(errno));
-				exit(EXIT_FAILURE);
-			}
-			break;
-		case 'n':
-			envflags |= MDB_NOSUBDIR;
-			break;
-		case 'p':
-			mode |= PRINT;
-			break;
-		case 's':
-			if (alldbs)
-				usage(prog);
-			subname = optarg;
-			break;
-		default:
-			usage(prog);
-		}
-	}
-
-	if (optind != argc - 1)
-		usage(prog);
-
-#ifdef SIGPIPE
-	signal(SIGPIPE, dumpsig);
-#endif
-#ifdef SIGHUP
-	signal(SIGHUP, dumpsig);
-#endif
-	signal(SIGINT, dumpsig);
-	signal(SIGTERM, dumpsig);
-
-	envname = argv[optind];
-	rc = mdb_env_create(&env);
-	if (rc) {
-		fprintf(stderr, "mdb_env_create failed, error %d %s\n", rc, mdb_strerror(rc));
-		return EXIT_FAILURE;
-	}
-
-	if (alldbs || subname) {
-		mdb_env_set_maxdbs(env, 2);
-	}
-
-	rc = mdb_env_open(env, envname, envflags | MDB_RDONLY, 0664);
-	if (rc) {
-		fprintf(stderr, "mdb_env_open failed, error %d %s\n", rc, mdb_strerror(rc));
-		goto env_close;
-	}
-
-	rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
-	if (rc) {
-		fprintf(stderr, "mdb_txn_begin failed, error %d %s\n", rc, mdb_strerror(rc));
-		goto env_close;
-	}
-
-	rc = mdb_open(txn, subname, 0, &dbi);
-	if (rc) {
-		fprintf(stderr, "mdb_open failed, error %d %s\n", rc, mdb_strerror(rc));
-		goto txn_abort;
-	}
-
-	if (alldbs) {
-		MDB_cursor *cursor;
-		MDB_val key;
-		int count = 0;
-
-		rc = mdb_cursor_open(txn, dbi, &cursor);
-		if (rc) {
-			fprintf(stderr, "mdb_cursor_open failed, error %d %s\n", rc, mdb_strerror(rc));
-			goto txn_abort;
-		}
-		while ((rc = mdb_cursor_get(cursor, &key, NULL, MDB_NEXT_NODUP)) == 0) {
-			char *str;
-			MDB_dbi db2;
-			if (memchr(key.mv_data, '\0', key.mv_size))
-				continue;
-			count++;
-			str = malloc(key.mv_size+1);
-			memcpy(str, key.mv_data, key.mv_size);
-			str[key.mv_size] = '\0';
-			rc = mdb_open(txn, str, 0, &db2);
-			if (rc == MDB_SUCCESS) {
-				if (list) {
-					printf("%s\n", str);
-					list++;
-				} else {
-					rc = dumpit(txn, db2, str);
-					if (rc)
-						break;
-				}
-				mdb_close(env, db2);
-			}
-			free(str);
-			if (rc) continue;
-		}
-		mdb_cursor_close(cursor);
-		if (!count) {
-			fprintf(stderr, "%s: %s does not contain multiple databases\n", prog, envname);
-			rc = MDB_NOTFOUND;
-		} else if (rc == MDB_NOTFOUND) {
-			rc = MDB_SUCCESS;
-		}
-	} else {
-		rc = dumpit(txn, dbi, subname);
-	}
-	if (rc && rc != MDB_NOTFOUND)
-		fprintf(stderr, "%s: %s: %s\n", prog, envname, mdb_strerror(rc));
-
-	mdb_close(env, dbi);
-txn_abort:
-	mdb_txn_abort(txn);
-env_close:
-	mdb_env_close(env);
-
-	return rc ? EXIT_FAILURE : EXIT_SUCCESS;
-}
--- a/external/db_drivers/liblmdb64/mdb_load.c
+++ b/external/db_drivers/liblmdb64/mdb_load.c
@ -1,454 +0,0 @@
-/* mdb_load.c - memory-mapped database load tool */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <ctype.h>
-#include <unistd.h>
-#include "lmdb.h"
-
-#define PRINT	1
-#define NOHDR	2
-static int mode;
-
-static char *subname = NULL;
-
-static size_t lineno;
-static int version;
-
-static int flags;
-
-static char *prog;
-
-static int Eof;
-
-static MDB_envinfo info;
-
-static MDB_val kbuf, dbuf;
-
-#ifdef _WIN32
-#define Z	"I"
-#else
-#define Z	"z"
-#endif
-
-#define STRLENOF(s)	(sizeof(s)-1)
-
-typedef struct flagbit {
-	int bit;
-	char *name;
-	int len;
-} flagbit;
-
-#define S(s)	s, STRLENOF(s)
-
-flagbit dbflags[] = {
-	{ MDB_REVERSEKEY, S("reversekey") },
-	{ MDB_DUPSORT, S("dupsort") },
-	{ MDB_INTEGERKEY, S("integerkey") },
-	{ MDB_DUPFIXED, S("dupfixed") },
-	{ MDB_INTEGERDUP, S("integerdup") },
-	{ MDB_REVERSEDUP, S("reversedup") },
-	{ 0, NULL, 0 }
-};
-
-static void readhdr(void)
-{
-	char *ptr;
-
-	while (fgets(dbuf.mv_data, dbuf.mv_size, stdin) != NULL) {
-		lineno++;
-		if (!strncmp(dbuf.mv_data, "VERSION=", STRLENOF("VERSION="))) {
-			version=atoi((char *)dbuf.mv_data+STRLENOF("VERSION="));
-			if (version > 3) {
-				fprintf(stderr, "%s: line %" Z "d: unsupported VERSION %d\n",
-					prog, lineno, version);
-				exit(EXIT_FAILURE);
-			}
-		} else if (!strncmp(dbuf.mv_data, "HEADER=END", STRLENOF("HEADER=END"))) {
-			break;
-		} else if (!strncmp(dbuf.mv_data, "format=", STRLENOF("format="))) {
-			if (!strncmp((char *)dbuf.mv_data+STRLENOF("FORMAT="), "print", STRLENOF("print")))
-				mode |= PRINT;
-			else if (strncmp((char *)dbuf.mv_data+STRLENOF("FORMAT="), "bytevalue", STRLENOF("bytevalue"))) {
-				fprintf(stderr, "%s: line %" Z "d: unsupported FORMAT %s\n",
-					prog, lineno, (char *)dbuf.mv_data+STRLENOF("FORMAT="));
-				exit(EXIT_FAILURE);
-			}
-		} else if (!strncmp(dbuf.mv_data, "database=", STRLENOF("database="))) {
-			ptr = memchr(dbuf.mv_data, '\n', dbuf.mv_size);
-			if (ptr) *ptr = '\0';
-			if (subname) free(subname);
-			subname = strdup((char *)dbuf.mv_data+STRLENOF("database="));
-		} else if (!strncmp(dbuf.mv_data, "type=", STRLENOF("type="))) {
-			if (strncmp((char *)dbuf.mv_data+STRLENOF("type="), "btree", STRLENOF("btree")))  {
-				fprintf(stderr, "%s: line %" Z "d: unsupported type %s\n",
-					prog, lineno, (char *)dbuf.mv_data+STRLENOF("type="));
-				exit(EXIT_FAILURE);
-			}
-		} else if (!strncmp(dbuf.mv_data, "mapaddr=", STRLENOF("mapaddr="))) {
-			int i;
-			ptr = memchr(dbuf.mv_data, '\n', dbuf.mv_size);
-			if (ptr) *ptr = '\0';
-			i = sscanf((char *)dbuf.mv_data+STRLENOF("mapaddr="), "%p", &info.me_mapaddr);
-			if (i != 1) {
-				fprintf(stderr, "%s: line %" Z "d: invalid mapaddr %s\n",
-					prog, lineno, (char *)dbuf.mv_data+STRLENOF("mapaddr="));
-				exit(EXIT_FAILURE);
-			}
-		} else if (!strncmp(dbuf.mv_data, "mapsize=", STRLENOF("mapsize="))) {
-			int i;
-			ptr = memchr(dbuf.mv_data, '\n', dbuf.mv_size);
-			if (ptr) *ptr = '\0';
-			i = sscanf((char *)dbuf.mv_data+STRLENOF("mapsize="), "%" Z "u", &info.me_mapsize);
-			if (i != 1) {
-				fprintf(stderr, "%s: line %" Z "d: invalid mapsize %s\n",
-					prog, lineno, (char *)dbuf.mv_data+STRLENOF("mapsize="));
-				exit(EXIT_FAILURE);
-			}
-		} else if (!strncmp(dbuf.mv_data, "maxreaders=", STRLENOF("maxreaders="))) {
-			int i;
-			ptr = memchr(dbuf.mv_data, '\n', dbuf.mv_size);
-			if (ptr) *ptr = '\0';
-			i = sscanf((char *)dbuf.mv_data+STRLENOF("maxreaders="), "%u", &info.me_maxreaders);
-			if (i != 1) {
-				fprintf(stderr, "%s: line %" Z "d: invalid maxreaders %s\n",
-					prog, lineno, (char *)dbuf.mv_data+STRLENOF("maxreaders="));
-				exit(EXIT_FAILURE);
-			}
-		} else {
-			int i;
-			for (i=0; dbflags[i].bit; i++) {
-				if (!strncmp(dbuf.mv_data, dbflags[i].name, dbflags[i].len) &&
-					((char *)dbuf.mv_data)[dbflags[i].len] == '=') {
-					flags |= dbflags[i].bit;
-					break;
-				}
-			}
-			if (!dbflags[i].bit) {
-				ptr = memchr(dbuf.mv_data, '=', dbuf.mv_size);
-				if (!ptr) {
-					fprintf(stderr, "%s: line %" Z "d: unexpected format\n",
-						prog, lineno);
-					exit(EXIT_FAILURE);
-				} else {
-					*ptr = '\0';
-					fprintf(stderr, "%s: line %" Z "d: unrecognized keyword ignored: %s\n",
-						prog, lineno, (char *)dbuf.mv_data);
-				}
-			}
-		}
-	}
-}
-
-static void badend(void)
-{
-	fprintf(stderr, "%s: line %" Z "d: unexpected end of input\n",
-		prog, lineno);
-}
-
-static int unhex(unsigned char *c2)
-{
-	int x, c;
-	x = *c2++ & 0x4f;
-	if (x & 0x40)
-		x -= 55;
-	c = x << 4;
-	x = *c2 & 0x4f;
-	if (x & 0x40)
-		x -= 55;
-	c |= x;
-	return c;
-}
-
-static int readline(MDB_val *out, MDB_val *buf)
-{
-	unsigned char *c1, *c2, *end;
-	size_t len, l2;
-	int c;
-
-	if (!(mode & NOHDR)) {
-		c = fgetc(stdin);
-		if (c == EOF) {
-			Eof = 1;
-			return EOF;
-		}
-		if (c != ' ') {
-			lineno++;
-			if (fgets(buf->mv_data, buf->mv_size, stdin) == NULL) {
-badend:
-				Eof = 1;
-				badend();
-				return EOF;
-			}
-			if (c == 'D' && !strncmp(buf->mv_data, "ATA=END", STRLENOF("ATA=END")))
-				return EOF;
-			goto badend;
-		}
-	}
-	if (fgets(buf->mv_data, buf->mv_size, stdin) == NULL) {
-		Eof = 1;
-		return EOF;
-	}
-	lineno++;
-
-	c1 = buf->mv_data;
-	len = strlen((char *)c1);
-	l2 = len;
-
-	/* Is buffer too short? */
-	while (c1[len-1] != '\n') {
-		buf->mv_data = realloc(buf->mv_data, buf->mv_size*2);
-		if (!buf->mv_data) {
-			Eof = 1;
-			fprintf(stderr, "%s: line %" Z "d: out of memory, line too long\n",
-				prog, lineno);
-			return EOF;
-		}
-		c1 = buf->mv_data;
-		c1 += l2;
-		if (fgets((char *)c1, buf->mv_size+1, stdin) == NULL) {
-			Eof = 1;
-			badend();
-			return EOF;
-		}
-		buf->mv_size *= 2;
-		len = strlen((char *)c1);
-		l2 += len;
-	}
-	c1 = c2 = buf->mv_data;
-	len = l2;
-	c1[--len] = '\0';
-	end = c1 + len;
-
-	if (mode & PRINT) {
-		while (c2 < end) {
-			if (*c2 == '\\') {
-				if (c2[1] == '\\') {
-					c1++; c2 += 2;
-				} else {
-					if (c2+3 > end || !isxdigit(c2[1]) || !isxdigit(c2[2])) {
-						Eof = 1;
-						badend();
-						return EOF;
-					}
-					*c1++ = unhex(++c2);
-					c2 += 2;
-				}
-			} else {
-				c1++; c2++;
-			}
-		}
-	} else {
-		/* odd length not allowed */
-		if (len & 1) {
-			Eof = 1;
-			badend();
-			return EOF;
-		}
-		while (c2 < end) {
-			if (!isxdigit(*c2) || !isxdigit(c2[1])) {
-				Eof = 1;
-				badend();
-				return EOF;
-			}
-			*c1++ = unhex(c2);
-			c2 += 2;
-		}
-	}
-	c2 = out->mv_data = buf->mv_data;
-	out->mv_size = c1 - c2;
-
-	return 0;
-}
-
-static void usage(void)
-{
-	fprintf(stderr, "usage: %s dbpath [-V] [-f input] [-n] [-s name] [-N] [-T]\n", prog);
-	exit(EXIT_FAILURE);
-}
-
-int main(int argc, char *argv[])
-{
-	int i, rc;
-	MDB_env *env;
-	MDB_txn *txn;
-	MDB_cursor *mc;
-	MDB_dbi dbi;
-	char *envname;
-	int envflags = 0, putflags = 0;
-	int dohdr = 0;
-
-	prog = argv[0];
-
-	if (argc < 2) {
-		usage();
-	}
-
-	/* -f: load file instead of stdin
-	 * -n: use NOSUBDIR flag on env_open
-	 * -s: load into named subDB
-	 * -N: use NOOVERWRITE on puts
-	 * -T: read plaintext
-	 * -V: print version and exit
-	 */
-	while ((i = getopt(argc, argv, "f:ns:NTV")) != EOF) {
-		switch(i) {
-		case 'V':
-			printf("%s\n", MDB_VERSION_STRING);
-			exit(0);
-			break;
-		case 'f':
-			if (freopen(optarg, "r", stdin) == NULL) {
-				fprintf(stderr, "%s: %s: reopen: %s\n",
-					prog, optarg, strerror(errno));
-				exit(EXIT_FAILURE);
-			}
-			break;
-		case 'n':
-			envflags |= MDB_NOSUBDIR;
-			break;
-		case 's':
-			subname = strdup(optarg);
-			break;
-		case 'N':
-			putflags = MDB_NOOVERWRITE|MDB_NODUPDATA;
-			break;
-		case 'T':
-			mode |= NOHDR;
-			break;
-		default:
-			usage();
-		}
-	}
-
-	if (optind != argc - 1)
-		usage();
-
-	dbuf.mv_size = 4096;
-	dbuf.mv_data = malloc(dbuf.mv_size);
-
-	if (!(mode & NOHDR))
-		readhdr();
-
-	envname = argv[optind];
-	rc = mdb_env_create(&env);
-	if (rc) {
-		fprintf(stderr, "mdb_env_create failed, error %d %s\n", rc, mdb_strerror(rc));
-		return EXIT_FAILURE;
-	}
-
-	mdb_env_set_maxdbs(env, 2);
-
-	if (info.me_maxreaders)
-		mdb_env_set_maxreaders(env, info.me_maxreaders);
-
-	if (info.me_mapsize)
-		mdb_env_set_mapsize(env, info.me_mapsize);
-
-	if (info.me_mapaddr)
-		envflags |= MDB_FIXEDMAP;
-
-	rc = mdb_env_open(env, envname, envflags, 0664);
-	if (rc) {
-		fprintf(stderr, "mdb_env_open failed, error %d %s\n", rc, mdb_strerror(rc));
-		goto env_close;
-	}
-
-	kbuf.mv_size = mdb_env_get_maxkeysize(env) * 2 + 2;
-	kbuf.mv_data = malloc(kbuf.mv_size);
-
-	while(!Eof) {
-		MDB_val key, data;
-		int batch = 0;
-		flags = 0;
-
-		if (!dohdr) {
-			dohdr = 1;
-		} else if (!(mode & NOHDR))
-			readhdr();
-		
-		rc = mdb_txn_begin(env, NULL, 0, &txn);
-		if (rc) {
-			fprintf(stderr, "mdb_txn_begin failed, error %d %s\n", rc, mdb_strerror(rc));
-			goto env_close;
-		}
-
-		rc = mdb_open(txn, subname, flags|MDB_CREATE, &dbi);
-		if (rc) {
-			fprintf(stderr, "mdb_open failed, error %d %s\n", rc, mdb_strerror(rc));
-			goto txn_abort;
-		}
-
-		rc = mdb_cursor_open(txn, dbi, &mc);
-		if (rc) {
-			fprintf(stderr, "mdb_cursor_open failed, error %d %s\n", rc, mdb_strerror(rc));
-			goto txn_abort;
-		}
-
-		while(1) {
-			rc = readline(&key, &kbuf);
-			if (rc == EOF)
-				break;
-			if (rc)
-				goto txn_abort;
-
-			rc = readline(&data, &dbuf);
-			if (rc)
-				goto txn_abort;
-			
-			rc = mdb_cursor_put(mc, &key, &data, putflags);
-			if (rc == MDB_KEYEXIST && putflags)
-				continue;
-			if (rc)
-				goto txn_abort;
-			batch++;
-			if (batch == 100) {
-				rc = mdb_txn_commit(txn);
-				if (rc) {
-					fprintf(stderr, "%s: line %" Z "d: txn_commit: %s\n",
-						prog, lineno, mdb_strerror(rc));
-					goto env_close;
-				}
-				rc = mdb_txn_begin(env, NULL, 0, &txn);
-				if (rc) {
-					fprintf(stderr, "mdb_txn_begin failed, error %d %s\n", rc, mdb_strerror(rc));
-					goto env_close;
-				}
-				rc = mdb_cursor_open(txn, dbi, &mc);
-				if (rc) {
-					fprintf(stderr, "mdb_cursor_open failed, error %d %s\n", rc, mdb_strerror(rc));
-					goto txn_abort;
-				}
-				batch = 0;
-			}
-		}
-		rc = mdb_txn_commit(txn);
-		txn = NULL;
-		if (rc) {
-			fprintf(stderr, "%s: line %" Z "d: txn_commit: %s\n",
-				prog, lineno, mdb_strerror(rc));
-			goto env_close;
-		}
-		mdb_dbi_close(env, dbi);
-	}
-
-txn_abort:
-	mdb_txn_abort(txn);
-env_close:
-	mdb_env_close(env);
-
-	return rc ? EXIT_FAILURE : EXIT_SUCCESS;
-}
--- a/external/db_drivers/liblmdb64/midl.h
+++ b/external/db_drivers/liblmdb64/midl.h
@ -1,186 +0,0 @@
-/**	@file midl.h
- *	@brief LMDB ID List header file.
- *
- *	This file was originally part of back-bdb but has been
- *	modified for use in libmdb. Most of the macros defined
- *	in this file are unused, just left over from the original.
- *
- *	This file is only used internally in libmdb and its definitions
- *	are not exposed publicly.
- */
-/* $OpenLDAP$ */
-/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
- *
- * Copyright 2000-2015 The OpenLDAP Foundation.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-#ifndef _MDB_MIDL_H_
-#define _MDB_MIDL_H_
-
-#include <stddef.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/** @defgroup internal	LMDB Internals
- *	@{
- */
-
-/** @defgroup idls	ID List Management
- *	@{
- */
-	/** A generic unsigned ID number. These were entryIDs in back-bdb.
-	 *	Preferably it should have the same size as a pointer.
-	 */
-typedef size_t MDB_ID;
-
-	/** An IDL is an ID List, a sorted array of IDs. The first
-	 * element of the array is a counter for how many actual
-	 * IDs are in the list. In the original back-bdb code, IDLs are
-	 * sorted in ascending order. For libmdb IDLs are sorted in
-	 * descending order.
-	 */
-typedef MDB_ID *MDB_IDL;
-
-/* IDL sizes - likely should be even bigger
- *   limiting factors: sizeof(ID), thread stack size
- */
-#define	MDB_IDL_LOGN	16	/* DB_SIZE is 2^16, UM_SIZE is 2^17 */
-#define MDB_IDL_DB_SIZE		(1<<MDB_IDL_LOGN)
-#define MDB_IDL_UM_SIZE		(1<<(MDB_IDL_LOGN+1))
-
-#define MDB_IDL_DB_MAX		(MDB_IDL_DB_SIZE-1)
-#define MDB_IDL_UM_MAX		(MDB_IDL_UM_SIZE-1)
-
-#define MDB_IDL_SIZEOF(ids)		(((ids)[0]+1) * sizeof(MDB_ID))
-#define MDB_IDL_IS_ZERO(ids) ( (ids)[0] == 0 )
-#define MDB_IDL_CPY( dst, src ) (memcpy( dst, src, MDB_IDL_SIZEOF( src ) ))
-#define MDB_IDL_FIRST( ids )	( (ids)[1] )
-#define MDB_IDL_LAST( ids )		( (ids)[(ids)[0]] )
-
-	/** Current max length of an #mdb_midl_alloc()ed IDL */
-#define MDB_IDL_ALLOCLEN( ids )	( (ids)[-1] )
-
-	/** Append ID to IDL. The IDL must be big enough. */
-#define mdb_midl_xappend(idl, id) do { \
-		MDB_ID *xidl = (idl), xlen = ++(xidl[0]); \
-		xidl[xlen] = (id); \
-	} while (0)
-
-	/** Search for an ID in an IDL.
-	 * @param[in] ids	The IDL to search.
-	 * @param[in] id	The ID to search for.
-	 * @return	The index of the first ID greater than or equal to \b id.
-	 */
-unsigned mdb_midl_search( MDB_IDL ids, MDB_ID id );
-
-	/** Allocate an IDL.
-	 * Allocates memory for an IDL of the given size.
-	 * @return	IDL on success, NULL on failure.
-	 */
-MDB_IDL mdb_midl_alloc(int num);
-
-	/** Free an IDL.
-	 * @param[in] ids	The IDL to free.
-	 */
-void mdb_midl_free(MDB_IDL ids);
-
-	/** Shrink an IDL.
-	 * Return the IDL to the default size if it has grown larger.
-	 * @param[in,out] idp	Address of the IDL to shrink.
-	 * @return	0 on no change, non-zero if shrunk.
-	 */
-int mdb_midl_shrink(MDB_IDL *idp);
-
-	/** Make room for num additional elements in an IDL.
-	 * @param[in,out] idp	Address of the IDL.
-	 * @param[in] num	Number of elements to make room for.
-	 * @return	0 on success, ENOMEM on failure.
-	 */
-int mdb_midl_need(MDB_IDL *idp, unsigned num);
-
-	/** Append an ID onto an IDL.
-	 * @param[in,out] idp	Address of the IDL to append to.
-	 * @param[in] id	The ID to append.
-	 * @return	0 on success, ENOMEM if the IDL is too large.
-	 */
-int mdb_midl_append( MDB_IDL *idp, MDB_ID id );
-
-	/** Append an IDL onto an IDL.
-	 * @param[in,out] idp	Address of the IDL to append to.
-	 * @param[in] app	The IDL to append.
-	 * @return	0 on success, ENOMEM if the IDL is too large.
-	 */
-int mdb_midl_append_list( MDB_IDL *idp, MDB_IDL app );
-
-	/** Append an ID range onto an IDL.
-	 * @param[in,out] idp	Address of the IDL to append to.
-	 * @param[in] id	The lowest ID to append.
-	 * @param[in] n		Number of IDs to append.
-	 * @return	0 on success, ENOMEM if the IDL is too large.
-	 */
-int mdb_midl_append_range( MDB_IDL *idp, MDB_ID id, unsigned n );
-
-	/** Merge an IDL onto an IDL. The destination IDL must be big enough.
-	 * @param[in] idl	The IDL to merge into.
-	 * @param[in] merge	The IDL to merge.
-	 */
-void mdb_midl_xmerge( MDB_IDL idl, MDB_IDL merge );
-
-	/** Sort an IDL.
-	 * @param[in,out] ids	The IDL to sort.
-	 */
-void mdb_midl_sort( MDB_IDL ids );
-
-	/** An ID2 is an ID/pointer pair.
-	 */
-typedef struct MDB_ID2 {
-	MDB_ID mid;		/**< The ID */
-	void *mptr;		/**< The pointer */
-} MDB_ID2;
-
-	/** An ID2L is an ID2 List, a sorted array of ID2s.
-	 * The first element's \b mid member is a count of how many actual
-	 * elements are in the array. The \b mptr member of the first element is unused.
-	 * The array is sorted in ascending order by \b mid.
-	 */
-typedef MDB_ID2 *MDB_ID2L;
-
-	/** Search for an ID in an ID2L.
-	 * @param[in] ids	The ID2L to search.
-	 * @param[in] id	The ID to search for.
-	 * @return	The index of the first ID2 whose \b mid member is greater than or equal to \b id.
-	 */
-unsigned mdb_mid2l_search( MDB_ID2L ids, MDB_ID id );
-
-
-	/** Insert an ID2 into a ID2L.
-	 * @param[in,out] ids	The ID2L to insert into.
-	 * @param[in] id	The ID2 to insert.
-	 * @return	0 on success, -1 if the ID was already present in the ID2L.
-	 */
-int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id );
-
-	/** Append an ID2 into a ID2L.
-	 * @param[in,out] ids	The ID2L to append into.
-	 * @param[in] id	The ID2 to append.
-	 * @return	0 on success, -2 if the ID2L is too big.
-	 */
-int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id );
-
-/** @} */
-/** @} */
-#ifdef __cplusplus
-}
-#endif
-#endif	/* _MDB_MIDL_H_ */
--- a/external/db_drivers/liblmdb64/mtest2.c
+++ b/external/db_drivers/liblmdb64/mtest2.c
@ -1,124 +0,0 @@
-/* mtest2.c - memory-mapped database tester/toy */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-/* Just like mtest.c, but using a subDB instead of the main DB */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
-#include "lmdb.h"
-
-#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
-#define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0))
-#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
-	"%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))
-
-int main(int argc,char * argv[])
-{
-	int i = 0, j = 0, rc;
-	MDB_env *env;
-	MDB_dbi dbi;
-	MDB_val key, data;
-	MDB_txn *txn;
-	MDB_stat mst;
-	MDB_cursor *cursor;
-	int count;
-	int *values;
-	char sval[32] = "";
-
-	srand(time(NULL));
-
-	count = (rand()%384) + 64;
-	values = (int *)malloc(count*sizeof(int));
-
-	for(i = 0;i<count;i++) {
-		values[i] = rand()%1024;
-	}
-
-	E(mdb_env_create(&env));
-	E(mdb_env_set_maxreaders(env, 1));
-	E(mdb_env_set_mapsize(env, 10485760));
-	E(mdb_env_set_maxdbs(env, 4));
-	E(mdb_env_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664));
-
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	E(mdb_dbi_open(txn, "id1", MDB_CREATE, &dbi));
-   
-	key.mv_size = sizeof(int);
-	key.mv_data = sval;
-
-	printf("Adding %d values\n", count);
-	for (i=0;i<count;i++) {	
-		sprintf(sval, "%03x %d foo bar", values[i], values[i]);
-		data.mv_size = sizeof(sval);
-		data.mv_data = sval;
-		if (RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NOOVERWRITE)))
-			j++;
-	}
-	if (j) printf("%d duplicates skipped\n", j);
-	E(mdb_txn_commit(txn));
-	E(mdb_env_stat(env, &mst));
-
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %p %.*s, data: %p %.*s\n",
-			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	j=0;
-	key.mv_data = sval;
-	for (i= count - 1; i > -1; i-= (rand()%5)) {
-		j++;
-		txn=NULL;
-		E(mdb_txn_begin(env, NULL, 0, &txn));
-		sprintf(sval, "%03x ", values[i]);
-		if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, NULL))) {
-			j--;
-			mdb_txn_abort(txn);
-		} else {
-			E(mdb_txn_commit(txn));
-		}
-	}
-	free(values);
-	printf("Deleted %d values\n", j);
-
-	E(mdb_env_stat(env, &mst));
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	printf("Cursor next\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	printf("Cursor prev\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	mdb_dbi_close(env, dbi);
-	mdb_env_close(env);
-	return 0;
-}
--- a/external/db_drivers/liblmdb64/mtest3.c
+++ b/external/db_drivers/liblmdb64/mtest3.c
@ -1,133 +0,0 @@
-/* mtest3.c - memory-mapped database tester/toy */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-/* Tests for sorted duplicate DBs */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include "lmdb.h"
-
-#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
-#define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0))
-#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
-	"%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))
-
-int main(int argc,char * argv[])
-{
-	int i = 0, j = 0, rc;
-	MDB_env *env;
-	MDB_dbi dbi;
-	MDB_val key, data;
-	MDB_txn *txn;
-	MDB_stat mst;
-	MDB_cursor *cursor;
-	int count;
-	int *values;
-	char sval[32];
-	char kval[sizeof(int)];
-
-	srand(time(NULL));
-
-	memset(sval, 0, sizeof(sval));
-
-	count = (rand()%384) + 64;
-	values = (int *)malloc(count*sizeof(int));
-
-	for(i = 0;i<count;i++) {
-		values[i] = rand()%1024;
-	}
-
-	E(mdb_env_create(&env));
-	E(mdb_env_set_mapsize(env, 10485760));
-	E(mdb_env_set_maxdbs(env, 4));
-	E(mdb_env_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664));
-
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	E(mdb_dbi_open(txn, "id2", MDB_CREATE|MDB_DUPSORT, &dbi));
-
-	key.mv_size = sizeof(int);
-	key.mv_data = kval;
-	data.mv_size = sizeof(sval);
-	data.mv_data = sval;
-
-	printf("Adding %d values\n", count);
-	for (i=0;i<count;i++) {
-		if (!(i & 0x0f))
-			sprintf(kval, "%03x", values[i]);
-		sprintf(sval, "%03x %d foo bar", values[i], values[i]);
-		if (RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA)))
-			j++;
-	}
-	if (j) printf("%d duplicates skipped\n", j);
-	E(mdb_txn_commit(txn));
-	E(mdb_env_stat(env, &mst));
-
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %p %.*s, data: %p %.*s\n",
-			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	j=0;
-
-	for (i= count - 1; i > -1; i-= (rand()%5)) {
-		j++;
-		txn=NULL;
-		E(mdb_txn_begin(env, NULL, 0, &txn));
-		sprintf(kval, "%03x", values[i & ~0x0f]);
-		sprintf(sval, "%03x %d foo bar", values[i], values[i]);
-		key.mv_size = sizeof(int);
-		key.mv_data = kval;
-		data.mv_size = sizeof(sval);
-		data.mv_data = sval;
-		if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, &data))) {
-			j--;
-			mdb_txn_abort(txn);
-		} else {
-			E(mdb_txn_commit(txn));
-		}
-	}
-	free(values);
-	printf("Deleted %d values\n", j);
-
-	E(mdb_env_stat(env, &mst));
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	printf("Cursor next\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	printf("Cursor prev\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	mdb_dbi_close(env, dbi);
-	mdb_env_close(env);
-	return 0;
-}
--- a/external/db_drivers/liblmdb64/mtest4.c
+++ b/external/db_drivers/liblmdb64/mtest4.c
@ -1,168 +0,0 @@
-/* mtest4.c - memory-mapped database tester/toy */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-/* Tests for sorted duplicate DBs with fixed-size keys */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include "lmdb.h"
-
-#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
-#define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0))
-#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
-	"%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))
-
-int main(int argc,char * argv[])
-{
-	int i = 0, j = 0, rc;
-	MDB_env *env;
-	MDB_dbi dbi;
-	MDB_val key, data;
-	MDB_txn *txn;
-	MDB_stat mst;
-	MDB_cursor *cursor;
-	int count;
-	int *values;
-	char sval[8];
-	char kval[sizeof(int)];
-
-	memset(sval, 0, sizeof(sval));
-
-	count = 510;
-	values = (int *)malloc(count*sizeof(int));
-
-	for(i = 0;i<count;i++) {
-		values[i] = i*5;
-	}
-
-	E(mdb_env_create(&env));
-	E(mdb_env_set_mapsize(env, 10485760));
-	E(mdb_env_set_maxdbs(env, 4));
-	E(mdb_env_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664));
-
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	E(mdb_dbi_open(txn, "id4", MDB_CREATE|MDB_DUPSORT|MDB_DUPFIXED, &dbi));
-
-	key.mv_size = sizeof(int);
-	key.mv_data = kval;
-	data.mv_size = sizeof(sval);
-	data.mv_data = sval;
-
-	printf("Adding %d values\n", count);
-	strcpy(kval, "001");
-	for (i=0;i<count;i++) {
-		sprintf(sval, "%07x", values[i]);
-		if (RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA)))
-			j++;
-	}
-	if (j) printf("%d duplicates skipped\n", j);
-	E(mdb_txn_commit(txn));
-	E(mdb_env_stat(env, &mst));
-
-	/* there should be one full page of dups now.
-	 */
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %p %.*s, data: %p %.*s\n",
-			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	/* test all 3 branches of split code:
-	 * 1: new key in lower half
-	 * 2: new key at split point
-	 * 3: new key in upper half
-	 */
-
-	key.mv_size = sizeof(int);
-	key.mv_data = kval;
-	data.mv_size = sizeof(sval);
-	data.mv_data = sval;
-
-	sprintf(sval, "%07x", values[3]+1);
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	(void)RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA));
-	mdb_txn_abort(txn);
-
-	sprintf(sval, "%07x", values[255]+1);
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	(void)RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA));
-	mdb_txn_abort(txn);
-
-	sprintf(sval, "%07x", values[500]+1);
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	(void)RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA));
-	E(mdb_txn_commit(txn));
-
-	/* Try MDB_NEXT_MULTIPLE */
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT_MULTIPLE)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-	j=0;
-
-	for (i= count - 1; i > -1; i-= (rand()%3)) {
-		j++;
-		txn=NULL;
-		E(mdb_txn_begin(env, NULL, 0, &txn));
-		sprintf(sval, "%07x", values[i]);
-		key.mv_size = sizeof(int);
-		key.mv_data = kval;
-		data.mv_size = sizeof(sval);
-		data.mv_data = sval;
-		if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, &data))) {
-			j--;
-			mdb_txn_abort(txn);
-		} else {
-			E(mdb_txn_commit(txn));
-		}
-	}
-	free(values);
-	printf("Deleted %d values\n", j);
-
-	E(mdb_env_stat(env, &mst));
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	printf("Cursor next\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	printf("Cursor prev\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	mdb_dbi_close(env, dbi);
-	mdb_env_close(env);
-	return 0;
-}
--- a/external/db_drivers/liblmdb64/mtest5.c
+++ b/external/db_drivers/liblmdb64/mtest5.c
@ -1,135 +0,0 @@
-/* mtest5.c - memory-mapped database tester/toy */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-/* Tests for sorted duplicate DBs using cursor_put */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include "lmdb.h"
-
-#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
-#define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0))
-#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
-	"%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))
-
-int main(int argc,char * argv[])
-{
-	int i = 0, j = 0, rc;
-	MDB_env *env;
-	MDB_dbi dbi;
-	MDB_val key, data;
-	MDB_txn *txn;
-	MDB_stat mst;
-	MDB_cursor *cursor;
-	int count;
-	int *values;
-	char sval[32];
-	char kval[sizeof(int)];
-
-	srand(time(NULL));
-
-	memset(sval, 0, sizeof(sval));
-
-	count = (rand()%384) + 64;
-	values = (int *)malloc(count*sizeof(int));
-
-	for(i = 0;i<count;i++) {
-		values[i] = rand()%1024;
-	}
-
-	E(mdb_env_create(&env));
-	E(mdb_env_set_mapsize(env, 10485760));
-	E(mdb_env_set_maxdbs(env, 4));
-	E(mdb_env_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664));
-
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	E(mdb_dbi_open(txn, "id2", MDB_CREATE|MDB_DUPSORT, &dbi));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-
-	key.mv_size = sizeof(int);
-	key.mv_data = kval;
-	data.mv_size = sizeof(sval);
-	data.mv_data = sval;
-
-	printf("Adding %d values\n", count);
-	for (i=0;i<count;i++) {
-		if (!(i & 0x0f))
-			sprintf(kval, "%03x", values[i]);
-		sprintf(sval, "%03x %d foo bar", values[i], values[i]);
-		if (RES(MDB_KEYEXIST, mdb_cursor_put(cursor, &key, &data, MDB_NODUPDATA)))
-			j++;
-	}
-	if (j) printf("%d duplicates skipped\n", j);
-	mdb_cursor_close(cursor);
-	E(mdb_txn_commit(txn));
-	E(mdb_env_stat(env, &mst));
-
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %p %.*s, data: %p %.*s\n",
-			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	j=0;
-
-	for (i= count - 1; i > -1; i-= (rand()%5)) {
-		j++;
-		txn=NULL;
-		E(mdb_txn_begin(env, NULL, 0, &txn));
-		sprintf(kval, "%03x", values[i & ~0x0f]);
-		sprintf(sval, "%03x %d foo bar", values[i], values[i]);
-		key.mv_size = sizeof(int);
-		key.mv_data = kval;
-		data.mv_size = sizeof(sval);
-		data.mv_data = sval;
-		if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, &data))) {
-			j--;
-			mdb_txn_abort(txn);
-		} else {
-			E(mdb_txn_commit(txn));
-		}
-	}
-	free(values);
-	printf("Deleted %d values\n", j);
-
-	E(mdb_env_stat(env, &mst));
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	printf("Cursor next\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	printf("Cursor prev\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	mdb_dbi_close(env, dbi);
-	mdb_env_close(env);
-	return 0;
-}
--- a/external/db_drivers/liblmdb64/mtest6.c
+++ b/external/db_drivers/liblmdb64/mtest6.c
@ -1,141 +0,0 @@
-/* mtest6.c - memory-mapped database tester/toy */
-/*
- * Copyright 2011-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-/* Tests for DB splits and merges */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include "lmdb.h"
-
-#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
-#define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0))
-#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
-	"%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))
-
-char dkbuf[1024];
-
-int main(int argc,char * argv[])
-{
-	int i = 0, j = 0, rc;
-	MDB_env *env;
-	MDB_dbi dbi;
-	MDB_val key, data, sdata;
-	MDB_txn *txn;
-	MDB_stat mst;
-	MDB_cursor *cursor;
-	int count;
-	int *values;
-	long kval;
-	char *sval;
-
-	srand(time(NULL));
-
-	E(mdb_env_create(&env));
-	E(mdb_env_set_mapsize(env, 10485760));
-	E(mdb_env_set_maxdbs(env, 4));
-	E(mdb_env_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664));
-
-	E(mdb_txn_begin(env, NULL, 0, &txn));
-	E(mdb_dbi_open(txn, "id6", MDB_CREATE|MDB_INTEGERKEY, &dbi));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	E(mdb_stat(txn, dbi, &mst));
-
-	sval = calloc(1, mst.ms_psize / 4);
-	key.mv_size = sizeof(long);
-	key.mv_data = &kval;
-	sdata.mv_size = mst.ms_psize / 4 - 30;
-	sdata.mv_data = sval;
-
-	printf("Adding 12 values, should yield 3 splits\n");
-	for (i=0;i<12;i++) {
-		kval = i*5;
-		sprintf(sval, "%08x", kval);
-		data = sdata;
-		(void)RES(MDB_KEYEXIST, mdb_cursor_put(cursor, &key, &data, MDB_NOOVERWRITE));
-	}
-	printf("Adding 12 more values, should yield 3 splits\n");
-	for (i=0;i<12;i++) {
-		kval = i*5+4;
-		sprintf(sval, "%08x", kval);
-		data = sdata;
-		(void)RES(MDB_KEYEXIST, mdb_cursor_put(cursor, &key, &data, MDB_NOOVERWRITE));
-	}
-	printf("Adding 12 more values, should yield 3 splits\n");
-	for (i=0;i<12;i++) {
-		kval = i*5+1;
-		sprintf(sval, "%08x", kval);
-		data = sdata;
-		(void)RES(MDB_KEYEXIST, mdb_cursor_put(cursor, &key, &data, MDB_NOOVERWRITE));
-	}
-	E(mdb_cursor_get(cursor, &key, &data, MDB_FIRST));
-
-	do {
-		printf("key: %p %s, data: %p %.*s\n",
-			key.mv_data,  mdb_dkey(&key, dkbuf),
-			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-	} while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0);
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_commit(txn);
-
-#if 0
-	j=0;
-
-	for (i= count - 1; i > -1; i-= (rand()%5)) {
-		j++;
-		txn=NULL;
-		E(mdb_txn_begin(env, NULL, 0, &txn));
-		sprintf(kval, "%03x", values[i & ~0x0f]);
-		sprintf(sval, "%03x %d foo bar", values[i], values[i]);
-		key.mv_size = sizeof(int);
-		key.mv_data = kval;
-		data.mv_size = sizeof(sval);
-		data.mv_data = sval;
-		if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, &data))) {
-			j--;
-			mdb_txn_abort(txn);
-		} else {
-			E(mdb_txn_commit(txn));
-		}
-	}
-	free(values);
-	printf("Deleted %d values\n", j);
-
-	E(mdb_env_stat(env, &mst));
-	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
-	E(mdb_cursor_open(txn, dbi, &cursor));
-	printf("Cursor next\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	printf("Cursor prev\n");
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
-		printf("key: %.*s, data: %.*s\n",
-			(int) key.mv_size,  (char *) key.mv_data,
-			(int) data.mv_size, (char *) data.mv_data);
-	}
-	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-
-	mdb_dbi_close(env, dbi);
-#endif
-	mdb_env_close(env);
-
-	return 0;
-}
--- a/external/db_drivers/liblmdb64/sample-bdb.txt
+++ b/external/db_drivers/liblmdb64/sample-bdb.txt
@ -1,73 +0,0 @@
-/* sample-bdb.txt - BerkeleyDB toy/sample
- *
- * Do a line-by-line comparison of this and sample-mdb.txt
- */
-/*
- * Copyright 2012-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-#include <stdio.h>
-#include <string.h>
-#include <db.h>
-
-int main(int argc,char * argv[])
-{
-	int rc;
-	DB_ENV *env;
-	DB *dbi;
-	DBT key, data;
-	DB_TXN *txn;
-	DBC *cursor;
-	char sval[32], kval[32];
-
-	/* Note: Most error checking omitted for simplicity */
-
-#define FLAGS (DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_TXN|DB_INIT_MPOOL|DB_CREATE|DB_THREAD)
-	rc = db_env_create(&env, 0);
-	rc = env->open(env, "./testdb", FLAGS, 0664);
-	rc = db_create(&dbi, env, 0);
-	rc = env->txn_begin(env, NULL, &txn, 0);
-	rc = dbi->open(dbi, txn, "test.bdb", NULL, DB_BTREE, DB_CREATE, 0664);
-
-	memset(&key, 0, sizeof(DBT));
-	memset(&data, 0, sizeof(DBT));
-	key.size = sizeof(int);
-	key.data = sval;
-	data.size = sizeof(sval);
-	data.data = sval;
-
-	sprintf(sval, "%03x %d foo bar", 32, 3141592);
-	rc = dbi->put(dbi, txn, &key, &data, 0);
-	rc = txn->commit(txn, 0);
-	if (rc) {
-		fprintf(stderr, "txn->commit: (%d) %s\n", rc, db_strerror(rc));
-		goto leave;
-	}
-	rc = env->txn_begin(env, NULL, &txn, 0);
-	rc = dbi->cursor(dbi, txn, &cursor, 0);
-	key.flags = DB_DBT_USERMEM;
-	key.data = kval;
-	key.ulen = sizeof(kval);
-	data.flags = DB_DBT_USERMEM;
-	data.data = sval;
-	data.ulen = sizeof(sval);
-	while ((rc = cursor->c_get(cursor, &key, &data, DB_NEXT)) == 0) {
-		printf("key: %p %.*s, data: %p %.*s\n",
-			key.data,  (int) key.size,  (char *) key.data,
-			data.data, (int) data.size, (char *) data.data);
-	}
-	rc = cursor->c_close(cursor);
-	rc = txn->abort(txn);
-leave:
-	rc = dbi->close(dbi, 0);
-	rc = env->close(env, 0);
-	return rc;
-}
--- a/external/db_drivers/liblmdb64/sample-mdb.txt
+++ b/external/db_drivers/liblmdb64/sample-mdb.txt
@ -1,62 +0,0 @@
-/* sample-mdb.txt - MDB toy/sample
- *
- * Do a line-by-line comparison of this and sample-bdb.txt
- */
-/*
- * Copyright 2012-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-#include <stdio.h>
-#include "lmdb.h"
-
-int main(int argc,char * argv[])
-{
-	int rc;
-	MDB_env *env;
-	MDB_dbi dbi;
-	MDB_val key, data;
-	MDB_txn *txn;
-	MDB_cursor *cursor;
-	char sval[32];
-
-	/* Note: Most error checking omitted for simplicity */
-
-	rc = mdb_env_create(&env);
-	rc = mdb_env_open(env, "./testdb", 0, 0664);
-	rc = mdb_txn_begin(env, NULL, 0, &txn);
-	rc = mdb_dbi_open(txn, NULL, 0, &dbi);
-
-	key.mv_size = sizeof(int);
-	key.mv_data = sval;
-	data.mv_size = sizeof(sval);
-	data.mv_data = sval;
-
-	sprintf(sval, "%03x %d foo bar", 32, 3141592);
-	rc = mdb_put(txn, dbi, &key, &data, 0);
-	rc = mdb_txn_commit(txn);
-	if (rc) {
-		fprintf(stderr, "mdb_txn_commit: (%d) %s\n", rc, mdb_strerror(rc));
-		goto leave;
-	}
-	rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
-	rc = mdb_cursor_open(txn, dbi, &cursor);
-	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
-		printf("key: %p %.*s, data: %p %.*s\n",
-			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
-			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
-	}
-	mdb_cursor_close(cursor);
-	mdb_txn_abort(txn);
-leave:
-	mdb_dbi_close(env, dbi);
-	mdb_env_close(env);
-	return 0;
-}
--- a/external/db_drivers/liblmdb64/tooltag
+++ b/external/db_drivers/liblmdb64/tooltag
@ -1,22 +0,0 @@
-<tagfile>
-  <compound kind="page">
-    <name>mdb_copy_1</name>
-	<title>mdb_copy - environment copy tool</title>
-	<filename>mdb_copy.1</filename>
-  </compound>
-  <compound kind="page">
-    <name>mdb_dump_1</name>
-	<title>mdb_dump - environment export tool</title>
-	<filename>mdb_dump.1</filename>
-  </compound>
-  <compound kind="page">
-    <name>mdb_load_1</name>
-	<title>mdb_load - environment import tool</title>
-	<filename>mdb_load.1</filename>
-  </compound>
-  <compound kind="page">
-    <name>mdb_stat_1</name>
-	<title>mdb_stat - environment status tool</title>
-	<filename>mdb_stat.1</filename>
-  </compound>
-</tagfile>