86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* base64.c
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* Base-64 conversion
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <string.h>
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#include "base64.h"
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/* Decode a base64 string in-place - simple and slow algorithm.
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Return length of result. Taken from rproxy/librsync/base64.c by
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Andrew Tridgell. */
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size_t epan_base64_decode(char *s)
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{
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static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\r\n";
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int bit_offset, byte_offset, idx, i;
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unsigned char *d = (unsigned char *)s;
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char *p;
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int cr_idx;
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/* we will allow CR and LF - but ignore them */
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cr_idx = (int) (strchr(b64, '\r') - b64);
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i=0;
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while (*s && (p=strchr(b64, *s))) {
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idx = (int)(p - b64);
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if(idx < cr_idx) {
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byte_offset = (i*6)/8;
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bit_offset = (i*6)%8;
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d[byte_offset] &= ~((1<<(8-bit_offset))-1);
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if (bit_offset < 3) {
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d[byte_offset] |= (idx << (2-bit_offset));
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} else {
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d[byte_offset] |= (idx >> (bit_offset-2));
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d[byte_offset+1] = 0;
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d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF;
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}
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i++;
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}
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s++;
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}
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d[i*3/4] = 0;
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return i*3/4;
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}
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/* Return a tvb that contains the binary representation of a base64
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string */
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tvbuff_t *
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base64_to_tvb(tvbuff_t *parent, const char *base64)
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{
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tvbuff_t *tvb;
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char *data = g_strdup(base64);
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gint len;
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len = (gint) epan_base64_decode(data);
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tvb = tvb_new_child_real_data(parent, (const guint8 *)data, len, len);
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tvb_set_free_cb(tvb, g_free);
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return tvb;
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}
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