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/**
* Copyright (c) 2021 Chris Hiszpanski. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author(s) may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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 "b64.h"
void b64_encode(char *dst, const char *src, size_t size) {
const char lut[64] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char spare = 0;
char state = 0;
while (size || spare) {
switch (state) {
case 0:
*dst++ = lut[((*src) >> 2) & 0x3F];
spare = (*src) & 0x3;
state = 1;
src++;
size--;
break;
case 1:
*dst++ = lut[(spare << 4) | (((*src) >> 4) & 0x0F)];
spare = (*src) & 0x0F;
state = 2;
src++;
size--;
break;
case 2:
*dst++ = lut[(spare << 2) | (((*src) >> 6) & 0x03)];
spare = (*src) & 0x3F;
state = 3;
size--;
break;
case 3:
*dst++ = lut[spare];
spare = 0;
state = 0;
break;
}
}
*dst = '\0';
}
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