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/* base64.c
* Copyright (c) 2011, Peter Ohler
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of Peter Ohler nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <stdio.h>
#include "base64.h"
static char digits[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/* invalid or terminating characters are set to 'X' or \x58 */
static uchar s_digits[256] = "\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x3E\x58\x58\x58\x3F\
\x34\x35\x36\x37\x38\x39\x3A\x3B\x3C\x3D\x58\x58\x58\x58\x58\x58\
\x58\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\
\x0F\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x58\x58\x58\x58\x58\
\x58\x1A\x1B\x1C\x1D\x1E\x1F\x20\x21\x22\x23\x24\x25\x26\x27\x28\
\x29\x2A\x2B\x2C\x2D\x2E\x2F\x30\x31\x32\x33\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\
\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58";
void
to_base64(const uchar *src, int len, char *b64) {
const uchar *end3;
int len3 = len % 3;
uchar b1, b2, b3;
end3 = src + (len - len3);
while (src < end3) {
b1 = *src++;
b2 = *src++;
b3 = *src++;
*b64++ = digits[(uchar)(b1 >> 2)];
*b64++ = digits[(uchar)(((b1 & 0x03) << 4) | (b2 >> 4))];
*b64++ = digits[(uchar)(((b2 & 0x0F) << 2) | (b3 >> 6))];
*b64++ = digits[(uchar)(b3 & 0x3F)];
}
if (1 == len3) {
b1 = *src++;
*b64++ = digits[b1 >> 2];
*b64++ = digits[(b1 & 0x03) << 4];
*b64++ = '=';
*b64++ = '=';
} else if (2 == len3) {
b1 = *src++;
b2 = *src++;
*b64++ = digits[b1 >> 2];
*b64++ = digits[((b1 & 0x03) << 4) | (b2 >> 4)];
*b64++ = digits[(b2 & 0x0F) << 2];
*b64++ = '=';
}
*b64 = '\0';
}
unsigned long
b64_orig_size(const char *text) {
const char *start = text;
unsigned long size = 0;
if ('\0' != *text) {
for (; 0 != *text; text++) { }
size = (text - start) * 3 / 4;
text--;
if ('=' == *text) {
size--;
text--;
if ('=' == *text) {
size--;
}
}
}
return size;
}
void
from_base64(const char *b64, uchar *str) {
uchar b0, b1, b2, b3;
while (1) {
if ('X' == (b0 = s_digits[(uchar)*b64++])) { break; }
if ('X' == (b1 = s_digits[(uchar)*b64++])) { break; }
*str++ = (b0 << 2) | ((b1 >> 4) & 0x03);
if ('X' == (b2 = s_digits[(uchar)*b64++])) { break; }
*str++ = (b1 << 4) | ((b2 >> 2) & 0x0F);
if ('X' == (b3 = s_digits[(uchar)*b64++])) { break; }
*str++ = (b2 << 6) | b3;
}
*str = '\0';
}
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