forked from osmocom/wireshark
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/* base64.c
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* Base-64 conversion
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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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 ws_base64_decode_inplace(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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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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