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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2002, 2009 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <mailutils/errno.h>
int
mu_base64_encode (const unsigned char *input, size_t input_len,
unsigned char **output, size_t * output_len)
{
static char b64tab[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
size_t olen = 4 * (input_len + 2) / 3;
unsigned char *out = malloc (olen);
if (!out)
return ENOMEM;
*output = out;
while (input_len >= 3)
{
*out++ = b64tab[input[0] >> 2];
*out++ = b64tab[((input[0] << 4) & 0x30) | (input[1] >> 4)];
*out++ = b64tab[((input[1] << 2) & 0x3c) | (input[2] >> 6)];
*out++ = b64tab[input[2] & 0x3f];
olen -= 4;
input_len -= 3;
input += 3;
}
if (input_len > 0)
{
unsigned char c = (input[0] << 4) & 0x30;
*out++ = b64tab[input[0] >> 2];
if (input_len > 1)
c |= input[1] >> 4;
*out++ = b64tab[c];
*out++ = (input_len < 2) ? '=' : b64tab[(input[1] << 2) & 0x3c];
*out++ = '=';
}
*output_len = out - *output;
return 0;
}
int
mu_base64_decode (const unsigned char *input, size_t input_len,
unsigned char **output, size_t * output_len)
{
static int b64val[128] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
};
int olen = input_len;
unsigned char *out = malloc (olen);
if (!out)
return ENOMEM;
*output = out;
do
{
if (input[0] > 127 || b64val[input[0]] == -1
|| input[1] > 127 || b64val[input[1]] == -1
|| input[2] > 127 || ((input[2] != '=') && (b64val[input[2]] == -1))
|| input[3] > 127 || ((input[3] != '=')
&& (b64val[input[3]] == -1)))
return -1;
*out++ = (b64val[input[0]] << 2) | (b64val[input[1]] >> 4);
if (input[2] != '=')
{
*out++ = ((b64val[input[1]] << 4) & 0xf0) | (b64val[input[2]] >> 2);
if (input[3] != '=')
*out++ = ((b64val[input[2]] << 6) & 0xc0) | b64val[input[3]];
}
input += 4;
input_len -= 4;
}
while (input_len > 0);
*output_len = out - *output;
return 0;
}
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