104 lines
2.0 KiB
C
104 lines
2.0 KiB
C
/* iksemel (XML parser for Jabber)
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** Copyright (C) 2000-2003 Gurer Ozen <madcat@e-kolay.net>
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** This code is free software; you can redistribute it and/or
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** modify it under the terms of GNU Lesser General Public License.
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*/
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#include "common.h"
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#include "iksemel.h"
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static const char base64_charset[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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char *iks_base64_decode(const char *buf)
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{
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char *res, *save;
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char val;
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const char *foo;
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const char *end;
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int index;
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size_t len;
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if (!buf)
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return NULL;
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len = iks_strlen(buf) * 6 / 8 + 1;
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save = res = iks_malloc(len);
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if (!save)
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return NULL;
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memset(res, 0, len);
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index = 0;
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end = buf + iks_strlen(buf);
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while (*buf && buf < end) {
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if (!(foo = strchr(base64_charset, *buf)))
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foo = base64_charset;
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val = (int)(foo - base64_charset);
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buf++;
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switch (index) {
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case 0:
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*res |= val << 2;
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break;
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case 1:
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*res++ |= val >> 4;
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*res |= val << 4;
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break;
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case 2:
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*res++ |= val >> 2;
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*res |= val << 6;
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break;
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case 3:
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*res++ |= val;
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break;
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}
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index++;
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index %= 4;
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}
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*res = 0;
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return save;
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}
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char *iks_base64_encode(const char *buf, int len)
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{
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char *res, *save;
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int k, t;
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len = (len > 0) ? (len) : (iks_strlen(buf));
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save = res = iks_malloc((len*8) / 6 + 4);
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if (!save) return NULL;
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for (k = 0; k < len/3; ++k) {
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*res++ = base64_charset[*buf >> 2];
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t = ((*buf & 0x03) << 4);
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buf++;
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*res++ = base64_charset[t | (*buf >> 4)];
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t = ((*buf & 0x0F) << 2);
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buf++;
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*res++ = base64_charset[t | (*buf >> 6)];
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*res++ = base64_charset[*buf++ & 0x3F];
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}
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switch (len % 3) {
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case 2:
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*res++ = base64_charset[*buf >> 2];
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t = ((*buf & 0x03) << 4);
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buf++;
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*res++ = base64_charset[t | (*buf >> 4)];
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*res++ = base64_charset[((*buf++ & 0x0F) << 2)];
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*res++ = '=';
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break;
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case 1:
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*res++ = base64_charset[*buf >> 2];
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*res++ = base64_charset[(*buf++ & 0x03) << 4];
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*res++ = '=';
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*res++ = '=';
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break;
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}
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*res = 0;
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return save;
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}
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