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/* base64.c
* Base-64 conversion
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <string.h>
#include "base64.h"
/* Decode a base64 string in-place - simple and slow algorithm.
Return length of result. Taken from rproxy/librsync/base64.c by
Andrew Tridgell. */
size_t ws_base64_decode_inplace(char *s)
{
static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\r\n";
int bit_offset, byte_offset, idx, i;
unsigned char *d = (unsigned char *)s;
char *p;
int cr_idx;
/* we will allow CR and LF - but ignore them */
cr_idx = (int)(strchr(b64, '\r') - b64);
i = 0;
while (*s && (p = strchr(b64, *s))) {
idx = (int)(p - b64);
if (idx < cr_idx) {
byte_offset = (i * 6) / 8;
bit_offset = (i * 6) % 8;
d[byte_offset] &= ~((1 << (8 - bit_offset)) - 1);
if (bit_offset < 3) {
d[byte_offset] |= (idx << (2 - bit_offset));
} else {
d[byte_offset] |= (idx >> (bit_offset - 2));
d[byte_offset + 1] = 0;
d[byte_offset + 1] |= (idx << (8 - (bit_offset - 2))) & 0xFF;
}
i++;
}
s++;
}
d[i*3/4] = 0;
return i*3/4;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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