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/* $Id$
*****************************************************************************
*
* File: base64.c
*
* Purpose: Implementation of the Base64 encode/decode algorithim.
*
* This code was derived from the base64.c part of FFmpeg written
* by Ryan Martell. (rdm4@martellventures.com).
*
* Copyright (C) Ryan Martell. (rdm4@martellventures.com)
* Copyright 2009-2010 Damien Stuart (dstuart@dstuart.org)
*
* License (GNU Public License):
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*****************************************************************************
*/
#include "base64.h"
static unsigned char map2[] =
{
0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
};
int
b64_decode(char *in, unsigned char *out, int out_len)
{
int i, v;
unsigned char *dst = out;
v = 0;
for (i = 0; in[i] && in[i] != '='; i++) {
unsigned int index= in[i]-43;
if (index>=(sizeof(map2)/sizeof(map2[0])) || map2[index] == 0xff)
return(-1);
v = (v << 6) + map2[index];
if (i & 3)
*dst++ = v >> (6 - 2 * (i & 3));
}
*dst = '\0';
return(dst - out);
}
/*****************************************************************************
* b64_encode: Stolen from VLC's http.c
* Simplified by michael
* fixed edge cases and made it work from data (vs. strings) by ryan.
*****************************************************************************
*/
int
b64_encode(unsigned char *in, char *out, int in_len)
{
static const char b64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
unsigned i_bits = 0;
int i_shift = 0;
int bytes_remaining = in_len;
char *dst = out;
if (in_len) { /* Special edge case, what should we really do here? */
while (bytes_remaining) {
i_bits = (i_bits << 8) + *in++;
bytes_remaining--;
i_shift += 8;
do {
*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
i_shift -= 6;
} while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
}
while ((dst - out) & 3)
*dst++ = '=';
}
*dst = '\0';
return(dst - out);
}
/* Strip trailing equals ("=") charcters from a base64-encode
* message digest.
*/
void
strip_b64_eq(char *data)
{
char *ndx;
if((ndx = strchr(data, '=')) != NULL)
*ndx = '\0';
}
/***EOF***/
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