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/**
* \file base64.c
*
* Base64 encoding/decoding, code.
*/
/*
* Copyright (c) 2000 Virtual Unlimited B.V.
*
* Author: Bob Deblier <bob@virtualunlimited.com>
*
* 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
*
*/
#define BEECRYPT_DLL_EXPORT
#include "base64.h"
static int _debug = 0;
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if HAVE_STRING_H
# include <string.h>
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <stdio.h>
int b64encode_chars_per_line = B64ENCODE_CHARS_PER_LINE;
const char * b64encode_eolstr = B64ENCODE_EOLSTR;
/*@-internalglobs -modfilesys @*/
char * b64encode (const void * data, int ns)
{
static char b64enc[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
const char *e;
const unsigned char *s = data;
unsigned char *t, *te;
int nt;
int lc;
unsigned c;
if (s == NULL) return NULL;
if (*s == '\0') return calloc(1, sizeof(*t));
if (ns == 0) ns = strlen(s);
nt = ((ns + 2) / 3) * 4;
/* Add additional bytes necessary for eol string(s). */
if (b64encode_chars_per_line > 0 && b64encode_eolstr != NULL) {
lc = (nt + b64encode_chars_per_line - 1) / b64encode_chars_per_line;
if (((nt + b64encode_chars_per_line - 1) % b64encode_chars_per_line) != 0)
++lc;
nt += lc * strlen(b64encode_eolstr);
}
t = te = malloc(nt + 1);
lc = 0;
if (te)
while (ns) {
if (_debug)
fprintf(stderr, "%7u %02x %02x %02x -> %02x %02x %02x %02x\n",
(unsigned)ns, (unsigned)s[0], (unsigned)s[1], (unsigned)s[2],
(unsigned)(s[0] >> 2),
(unsigned)((s[0] & 0x3) << 4) | (s[1] >> 4),
(unsigned)((s[1] & 0xf) << 2) | (s[2] >> 6),
(unsigned)(s[2]& 0x3f));
c = *s++;
*te++ = b64enc[ (c >> 2) ], lc++;
*te++ = b64enc[ ((c & 0x3) << 4) | (*s >> 4) ], lc++;
if (--ns == 0) {
*te++ = '=';
*te++ = '=';
continue;
}
c = *s++;
*te++ = b64enc[ ((c & 0xf) << 2) | (*s >> 6) ], lc++;
if (--ns == 0) {
*te++ = '=';
continue;
}
*te++ = b64enc[ (int)(*s & 0x3f) ], lc++;
/* Append eol string if desired. */
if (b64encode_chars_per_line > 0 && b64encode_eolstr != NULL) {
if (lc >= b64encode_chars_per_line) {
for (e = b64encode_eolstr; *e != '\0'; e++)
*te++ = *e;
lc = 0;
}
}
s++;
--ns;
}
if (te) {
/* Append eol string if desired. */
if (b64encode_chars_per_line > 0 && b64encode_eolstr != NULL) {
if (lc != 0) {
for (e = b64encode_eolstr; *e != '\0'; e++)
*te++ = *e;
}
}
*te = '\0';
}
/*@-mustfree@*/
return t;
/*@=mustfree@*/
}
/*@=internalglobs =modfilesys @*/
const char * b64decode_whitespace = B64DECODE_WHITESPACE;
/*@-internalglobs -modfilesys @*/
int b64decode (const char * s, void ** datap, int *lenp)
{
unsigned char b64dec[255];
const unsigned char *t;
unsigned char *te;
int ns, nt;
unsigned a, b, c, d;
if (s == NULL) return 1;
/* Setup character lookup tables. */
memset(b64dec, 0x80, sizeof(b64dec));
for (c = 'A'; c <= 'Z'; c++)
b64dec[ c ] = 0 + (c - 'A');
for (c = 'a'; c <= 'z'; c++)
b64dec[ c ] = 26 + (c - 'a');
for (c = '0'; c <= '9'; c++)
b64dec[ c ] = 52 + (c - '0');
b64dec[(unsigned)'+'] = 62;
b64dec[(unsigned)'/'] = 63;
b64dec[(unsigned)'='] = 0;
/* Mark whitespace characters. */
if (b64decode_whitespace) {
const char *e;
for (e = b64decode_whitespace; *e != '\0'; e++) {
if (b64dec[ (unsigned)*e ] == 0x80)
b64dec[ (unsigned)*e ] = 0x81;
}
}
/* Validate input buffer */
ns = 0;
for (t = s; *t != '\0'; t++) {
switch (b64dec[ (unsigned)*t ]) {
case 0x80: /* invalid chararcter */
return 3;
/*@notreached@*/ /*@switchbreak@*/ break;
case 0x81: /* white space */
/*@switchbreak@*/ break;
default:
ns++;
/*@switchbreak@*/ break;
}
}
if (ns & 0x3) return 2;
nt = (ns / 4) * 3;
t = te = malloc(nt + 1);
while (ns > 0) {
/* Get next 4 characters, ignoring whitespace. */
while ((a = b64dec[ (unsigned)*s++ ]) == 0x81)
{};
while ((b = b64dec[ (unsigned)*s++ ]) == 0x81)
{};
while ((c = b64dec[ (unsigned)*s++ ]) == 0x81)
{};
while ((d = b64dec[ (unsigned)*s++ ]) == 0x81)
{};
if (_debug)
fprintf(stderr, "%7u %02x %02x %02x %02x -> %02x %02x %02x\n",
(unsigned)ns, a, b, c, d,
(((a << 2) | (b >> 4)) & 0xff),
(((b << 4) | (c >> 2)) & 0xff),
(((c << 6) | d) & 0xff));
ns -= 4;
*te++ = (a << 2) | (b >> 4);
if (s[-2] == '=') break;
*te++ = (b << 4) | (c >> 2);
if (s[-1] == '=') break;
*te++ = (c << 6) | d;
}
if (ns != 0) { /* XXX can't happen, just in case */
if (t) free((void *)t);
return 3;
}
if (lenp)
*lenp = (te - t);
if (datap)
*datap = (void *)t;
else
if (t) free((void *)t);
else
{};
return 0;
}
/*@=internalglobs =modfilesys @*/
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