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95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
// Copyright (C) 2011 Milo Yip
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#ifndef RAPIDJSON_FILEREADSTREAM_H_
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#define RAPIDJSON_FILEREADSTREAM_H_
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#include "rapidjson.h"
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#include <cstdio>
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namespace rapidjson {
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//! File byte stream for input using fread().
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/*!
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\note implements Stream concept
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*/
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class FileReadStream {
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public:
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typedef char Ch; //!< Character type (byte).
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//! Constructor.
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/*!
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\param fp File pointer opened for read.
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\param buffer user-supplied buffer.
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\param bufferSize size of buffer in bytes. Must >=4 bytes.
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*/
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FileReadStream(FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferSize_(bufferSize), bufferLast_(0), current_(buffer_), readCount_(0), count_(0), eof_(false) {
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RAPIDJSON_ASSERT(fp_ != 0);
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RAPIDJSON_ASSERT(bufferSize >= 4);
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Read();
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}
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Ch Peek() const { return *current_; }
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Ch Take() { Ch c = *current_; Read(); return c; }
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size_t Tell() const { return count_ + static_cast<size_t>(current_ - buffer_); }
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// Not implemented
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void Put(Ch) { RAPIDJSON_ASSERT(false); }
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void Flush() { RAPIDJSON_ASSERT(false); }
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Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
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size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
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// For encoding detection only.
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const Ch* Peek4() const {
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return (current_ + 4 <= bufferLast_) ? current_ : 0;
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}
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private:
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void Read() {
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if (current_ < bufferLast_)
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++current_;
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else if (!eof_) {
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count_ += readCount_;
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readCount_ = fread(buffer_, 1, bufferSize_, fp_);
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bufferLast_ = buffer_ + readCount_ - 1;
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current_ = buffer_;
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if (readCount_ < bufferSize_) {
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buffer_[readCount_] = '\0';
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++bufferLast_;
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eof_ = true;
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}
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}
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}
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FILE* fp_;
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Ch *buffer_;
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size_t bufferSize_;
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Ch *bufferLast_;
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Ch *current_;
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size_t readCount_;
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size_t count_; //!< Number of characters read
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bool eof_;
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};
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} // namespace rapidjson
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#endif // RAPIDJSON_FILESTREAM_H_
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