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httplib_base64_encode.c
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httplib_base64_encode.c
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/*
* Copyright (c) 2016 Lammert Bies
* Copyright (c) 2013-2016 the Civetweb developers
* Copyright (c) 2004-2013 Sergey Lyubka
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* ============
* Release: 2.0
*/
#include "httplib_main.h"
#include "httplib_utils.h"
/*
* int httplib_base64_encode( const unsigned char *src, int src_len, char *dst, int dst_len );
*
* The function httplib_base64_encode() converts a binary buffer of given
* length to its BASE64 equivalent. If an error occurs or the receive buffer is
* too small, -1 is returned. Otherwise the return value is the length of the
* data in the receive buffer, including the terminating NUL character.
*/
LIBHTTP_API int httplib_base64_encode( const unsigned char *src, int src_len, char *dst, int dst_len ) {
static const char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int i;
int j;
int a;
int b;
int c;
if ( src == NULL || src_len <= 0 || dst == NULL || dst_len < 1 ) return -1;
j = 0;
for (i=0; i<src_len; i+=3) {
a = src[i];
b = ((i+1) >= src_len) ? 0 : src[i+1];
c = ((i+2) >= src_len) ? 0 : src[i+2];
dst[j++] = b64[a >> 2];
if ( j >= dst_len ) return -1;
dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
if ( j >= dst_len ) return -1;
if (i+1 < src_len) dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
if ( j >= dst_len ) return -1;
if (i+2 < src_len) dst[j++] = b64[ c & 63 ];
if ( j >= dst_len ) return -1;
}
while ( j % 4 != 0 ) {
dst[j++] = '=';
if ( j >= dst_len ) return -1;
}
dst[j++] = 0;
return j;
} /* httplib_base64_encode */