mirror of
https://gitlab.gnome.org/GNOME/libsecret.git
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151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
/*
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* gnome-keyring
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*
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* Copyright (C) 2008 Stefan Walter
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include "config.h"
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#include "egg-hex.h"
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#include <string.h>
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static const char HEXC_UPPER[] = "0123456789ABCDEF";
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static const char HEXC_LOWER[] = "0123456789abcdef";
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gpointer
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egg_hex_decode (const gchar *data, gssize n_data, gsize *n_decoded)
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{
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return egg_hex_decode_full (data, n_data, 0, 1, n_decoded);
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}
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gpointer
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egg_hex_decode_full (const gchar *data, gssize n_data,
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gchar delim, guint group, gsize *n_decoded)
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{
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guchar *result;
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guchar *decoded;
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gushort j;
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gint state = 0;
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gint part = 0;
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const gchar* pos;
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g_return_val_if_fail (data || !n_data, NULL);
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g_return_val_if_fail (n_decoded, NULL);
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g_return_val_if_fail (group >= 1, NULL);
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if (n_data == -1)
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n_data = strlen (data);
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decoded = result = g_malloc0 ((n_data / 2) + 1);
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*n_decoded = 0;
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while (n_data > 0 && state == 0) {
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if (decoded != result && delim) {
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if (*data != delim) {
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state = -1;
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break;
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}
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++data;
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--n_data;
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}
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while (part < group && n_data > 0) {
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/* Find the position */
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pos = strchr (HEXC_UPPER, g_ascii_toupper (*data));
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if (pos == 0) {
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if (n_data > 0)
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state = -1;
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break;
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}
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j = pos - HEXC_UPPER;
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if(!state) {
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*decoded = (j & 0xf) << 4;
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state = 1;
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} else {
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*decoded |= (j & 0xf);
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(*n_decoded)++;
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decoded++;
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state = 0;
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part++;
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}
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++data;
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--n_data;
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}
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part = 0;
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}
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/* Parsing error */
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if (state != 0) {
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g_free (result);
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result = NULL;
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}
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return result;
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}
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gchar*
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egg_hex_encode (gconstpointer data, gsize n_data)
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{
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return egg_hex_encode_full (data, n_data, TRUE, '\0', 0);
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}
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gchar*
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egg_hex_encode_full (gconstpointer data, gsize n_data,
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gboolean upper_case, gchar delim, guint group)
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{
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GString *result;
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const gchar *input;
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const char *hexc;
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gsize bytes;
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guchar j;
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g_return_val_if_fail (data || !n_data, NULL);
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input = data;
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hexc = upper_case ? HEXC_UPPER : HEXC_LOWER;
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result = g_string_sized_new (n_data * 2 + 1);
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bytes = 0;
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while (n_data > 0) {
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if (group && bytes && (bytes % group) == 0)
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g_string_append_c (result, delim);
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j = *(input) >> 4 & 0xf;
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g_string_append_c (result, hexc[j]);
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j = *(input++) & 0xf;
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g_string_append_c (result, hexc[j]);
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++bytes;
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--n_data;
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}
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/* Make sure still null terminated */
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return g_string_free (result, FALSE);
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}
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