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/*
* (GLABELS) Label and Business Card Creation program for GNOME
*
* base64.c: GLabels base64 encode/decode module
*
* Copyright (C) 2003 Jim Evins <evins@snaught.com>
*
* This module is based on base64.c from fetchmail:
*
* Copyright (C)2002 by Eric S. Raymond.
* Portions are copyrighted by Carl E. Harris and George M. Sipe.
*
* This program 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
*/
/*
* This base 64 encoding is defined in RFC2045 section 6.8.
*/
#include <config.h>
#include "base64.h"
#include <glib/gmem.h>
#include <string.h>
/*========================================================*/
/* Private macros and constants. */
/*========================================================*/
#define LINE_LENGTH 76 /* Must be <= 76 and must be a multiple of 4 */
#define BAD -1
#define DECODE64(c) (isascii(c) ? base64val[c] : BAD)
/*========================================================*/
/* Private types. */
/*========================================================*/
/*========================================================*/
/* Private globals. */
/*========================================================*/
static const gchar base64digits[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const gchar base64val[] = {
BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD, 62, BAD,BAD,BAD, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,BAD,BAD, BAD,BAD,BAD,BAD,
BAD, 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,BAD, BAD,BAD,BAD,BAD,
BAD, 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,BAD, BAD,BAD,BAD,BAD
};
/*========================================================*/
/* Private function prototypes. */
/*========================================================*/
/*****************************************************************************/
/* Encode to Base64 string. */
/*****************************************************************************/
gchar *
gl_base64_encode (const guchar *in, guint inlen)
{
gchar *out, *p_out;
gint buf_size;
gint i;
/* Calculate output buffer size */
buf_size = 4*((inlen+2)/3); /* Encoded characters */
buf_size += buf_size / LINE_LENGTH + 2; /* Line breaks */
buf_size += 1; /* null termination */
/* Allocate output buffer */
out = g_new0 (gchar, buf_size);
p_out=out;
/* Now do the encoding */
*p_out++ = '\n';
for ( i=0; inlen >= 3; inlen-=3 ) {
*p_out++ = base64digits[in[0] >> 2];
*p_out++ = base64digits[((in[0] << 4) & 0x30) | (in[1] >> 4)];
*p_out++ = base64digits[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
*p_out++ = base64digits[in[2] & 0x3f];
in += 3;
i += 4;
if ( (i % LINE_LENGTH) == 0 ) {
*p_out++ = '\n';
}
}
if (inlen > 0) {
guchar fragment;
*p_out++ = base64digits[in[0] >> 2];
fragment = (in[0] << 4) & 0x30;
if (inlen > 1)
fragment |= in[1] >> 4;
*p_out++ = base64digits[fragment];
*p_out++ = (inlen < 2) ? '=' : base64digits[(in[1] << 2) & 0x3c];
*p_out++ = '=';
*p_out++ = '\n';
}
*p_out++ = '\0';
return out;
}
/*****************************************************************************/
/* Decode from a Base64 string. */
/*****************************************************************************/
guchar *
gl_base64_decode (const gchar *in, guint *outlen)
{
gchar *out, *p_out;
gint buf_size;
register guchar digit1, digit2, digit3, digit4;
/* Calculate output buffer size */
buf_size = strlen (in) * 3 / 4;
/* Allocate output buffer */
out = g_new0 (gchar, buf_size);
*outlen = 0;
p_out = out;
/* Skip non-printable characters */
while ( (*in == '\n') || (*in == '\r') || (*in == ' ') ) {
in ++;
}
if (!*in) {
g_free (out);
return NULL;
}
/* Now do the decoding */
do {
digit1 = in[0];
if (DECODE64(digit1) == BAD) {
g_free (out);
return NULL;
}
digit2 = in[1];
if (DECODE64(digit2) == BAD) {
g_free (out);
return NULL;
}
digit3 = in[2];
if (digit3 != '=' && DECODE64(digit3) == BAD) {
g_free (out);
return NULL;
}
digit4 = in[3];
if (digit4 != '=' && DECODE64(digit4) == BAD) {
g_free (out);
return NULL;
}
in += 4;
*p_out++ = (DECODE64(digit1)<<2) | (DECODE64(digit2) >> 4);
(*outlen)++;
if (digit3 != '=')
{
*p_out++ = ((DECODE64(digit2)<<4)&0xf0) | (DECODE64(digit3)>>2);
(*outlen)++;
if (digit4 != '=')
{
*p_out++ = ((DECODE64(digit3)<<6)&0xc0) | DECODE64(digit4);
(*outlen)++;
}
}
/* Skip non-printable characters */
while ( (*in == '\n') || (*in == '\r') || (*in == ' ') ) {
in ++;
}
} while (*in && digit4 != '=');
return out;
}
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