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/*
* gnome-keyring
*
* Copyright (C) 2008 Stefan Walter
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* Author: Stef Walter <stefw@thewalter.net>
*/
#include "config.h"
#include "egg-hex.h"
#include <string.h>
static const char HEXC_UPPER[] = "0123456789ABCDEF";
static const char HEXC_LOWER[] = "0123456789abcdef";
gpointer
egg_hex_decode (const gchar *data, gssize n_data, gsize *n_decoded)
{
return egg_hex_decode_full (data, n_data, 0, 1, n_decoded);
}
gpointer
egg_hex_decode_full (const gchar *data,
gssize n_data,
const gchar *delim,
guint group,
gsize *n_decoded)
{
guchar *result;
guchar *decoded;
gsize n_delim;
gushort j;
gint state = 0;
gint part = 0;
const gchar* pos;
g_return_val_if_fail (data || !n_data, NULL);
g_return_val_if_fail (n_decoded, NULL);
g_return_val_if_fail (group >= 1, NULL);
if (n_data == -1)
n_data = strlen (data);
n_delim = delim ? strlen (delim) : 0;
decoded = result = g_malloc0 ((n_data / 2) + 1);
*n_decoded = 0;
while (n_data > 0 && state == 0) {
if (decoded != result && delim) {
if (n_data < n_delim || memcmp (data, delim, n_delim) != 0) {
state = -1;
break;
}
data += n_delim;
n_data -= n_delim;
}
while (part < group && n_data > 0) {
/* Find the position */
pos = strchr (HEXC_UPPER, g_ascii_toupper (*data));
if (pos == 0) {
if (n_data > 0)
state = -1;
break;
}
j = pos - HEXC_UPPER;
if(!state) {
*decoded = (j & 0xf) << 4;
state = 1;
} else {
*decoded |= (j & 0xf);
(*n_decoded)++;
decoded++;
state = 0;
part++;
}
++data;
--n_data;
}
part = 0;
}
/* Parsing error */
if (state != 0) {
g_free (result);
result = NULL;
}
return result;
}
gchar*
egg_hex_encode (gconstpointer data, gsize n_data)
{
return egg_hex_encode_full (data, n_data, TRUE, NULL, 0);
}
gchar*
egg_hex_encode_full (gconstpointer data,
gsize n_data,
gboolean upper_case,
const gchar *delim,
guint group)
{
GString *result;
const gchar *input;
const char *hexc;
gsize bytes;
guchar j;
g_return_val_if_fail (data || !n_data, NULL);
input = data;
hexc = upper_case ? HEXC_UPPER : HEXC_LOWER;
result = g_string_sized_new (n_data * 2 + 1);
bytes = 0;
while (n_data > 0) {
if (delim && group && bytes && (bytes % group) == 0)
g_string_append (result, delim);
j = *(input) >> 4 & 0xf;
g_string_append_c (result, hexc[j]);
j = *(input++) & 0xf;
g_string_append_c (result, hexc[j]);
++bytes;
--n_data;
}
/* Make sure still null terminated */
return g_string_free (result, FALSE);
}
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