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/*
* base64.c: Base64 converting functions
*
* Copyright (C) 2001, 2002 Juha Yrjölä <juha.yrjola@iki.fi>
*
* 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 2.1 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
extern int sc_base64_decode(const char *in, unsigned char *out, size_t outlen);
static const unsigned char base64_table[66] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" "0123456789+/=";
static const unsigned char bin_table[128] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xE0, 0xD0, 0xFF, 0xFF, 0xD0, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xF2, 0xFF, 0x3F,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0xC0, 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, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
};
#if 0
static void to_base64(unsigned int i, unsigned char *out, unsigned int fillers)
{
unsigned int s = 18, c;
for (c = 0; c < 4; c++) {
if (fillers >= 4 - c)
*out = base64_table[64];
else
*out = base64_table[(i >> s) & 0x3f];
out++;
s -= 6;
}
}
#endif
static int from_base64(const char *in, unsigned int *out, int *skip)
{
unsigned int res = 0, c, s = 18;
const char *in0 = in;
for (c = 0; c < 4; c++, in++) {
unsigned char b;
int k = *in;
if (k < 0)
return -1;
if (k == 0 && c == 0)
return 0;
b = bin_table[k];
if (b == 0xC0) /* '=' */
break;
switch (b) {
case 0xD0: /* '\n' or '\r' */
c--;
continue;
}
if (b > 0x3f)
return -1;
res |= b << s;
s -= 6;
}
*skip = in - in0;
*out = res;
return c * 6 / 8;
}
#if 0
int sc_base64_encode(const unsigned char *in, size_t len, unsigned char *out,
size_t outlen, size_t linelength)
{
unsigned int chars = 0;
size_t i, c;
linelength -= linelength & 0x03;
if (linelength < 0)
return -1;
while (len >= 3) {
i = in[2] + (in[1] << 8) + (in[0] << 16);
in += 3;
len -= 3;
if (outlen < 4)
return -1;
to_base64(i, out, 0);
out += 4;
outlen -= 4;
chars += 4;
if (chars >= linelength && linelength > 0) {
if (outlen < 1)
return -1;
*out = '\n';
out++;
outlen--;
chars = 0;
}
}
i = c = 0;
while (c < len)
i |= *in++ << ((2 - c++) << 3);
if (len) {
if (outlen < 4)
return -1;
to_base64(i, out, 3 - len);
out += 4;
outlen -= 4;
chars += 4;
}
if (chars && linelength > 0) {
if (outlen < 1)
return -1;
*out = '\n';
out++;
outlen--;
}
if (outlen < 1)
return -1;
*out = 0;
return 0;
}
#endif
int sc_base64_decode(const char *in, unsigned char *out, size_t outlen)
{
int len = 0, r, skip;
unsigned int i;
while ((r = from_base64(in, &i, &skip)) > 0) {
int finished = 0, s = 16;
if (r < 3)
finished = 1;
while (r--) {
if (outlen <= 0)
return -1;
*out++ = i >> s;
s -= 8;
outlen--;
len++;
}
in += skip;
if (finished || *in == 0)
return len;
}
if (r == 0)
return len;
return -1;
}
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