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base64.c

//  MaCoPiX = Mascot Construnctive Pilot for X
//                                (ActX / Gtk+ Evolution)
//
//
//     base64.c
//     MIME base64 decoding architecture
//      originated from Sylpheed  *** see below copyright ***
//
//                            Copyright 2002-2007  K.Chimari
//                                     http://rosegray.sakura.ne.jp/
//
//
//  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
//

/*
 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
 * Copyright (C) 1999-2002 Hiroyuki Yamamoto
 *
 * 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.
 */

#include "main.h"

#ifdef USE_BIFF

#include <glib.h>
#include <ctype.h>
#include <string.h>

#include "base64.h"

static const gchar base64char[64] =
      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

static const gchar base64val[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
};

#define BASE64VAL(c)    (isascii((guchar)c) ? base64val[(gint)(c)] : -1)

void base64_encode(gchar *out, const guchar *in, gint inlen)
{
      const guchar *inp = in;
      gchar *outp = out;

      while (inlen >= 3) {
            *outp++ = base64char[(inp[0] >> 2) & 0x3f];
            *outp++ = base64char[((inp[0] & 0x03) << 4) |
                             ((inp[1] >> 4) & 0x0f)];
            *outp++ = base64char[((inp[1] & 0x0f) << 2) |
                             ((inp[2] >> 6) & 0x03)];
            *outp++ = base64char[inp[2] & 0x3f];

            inp += 3;
            inlen -= 3;
      }

      if (inlen > 0) {
            *outp++ = base64char[(inp[0] >> 2) & 0x3f];
            if (inlen == 1) {
                  *outp++ = base64char[(inp[0] & 0x03) << 4];
                  *outp++ = '=';
            } else {
                  *outp++ = base64char[((inp[0] & 0x03) << 4) |
                                   ((inp[1] >> 4) & 0x0f)];
                  *outp++ = base64char[((inp[1] & 0x0f) << 2)];
            }
            *outp++ = '=';
      }

      *outp = '\0';
}

gint base64_decode(guchar *out, const gchar *in, gint inlen)
{
      const gchar *inp = in;
      guchar *outp = out;
      gchar buf[4];

      if (inlen < 0)
            inlen = G_MAXINT;

      while (inlen >= 4 && *inp != '\0') {
            buf[0] = *inp++;
            inlen--;
            if (BASE64VAL(buf[0]) == -1) break;

            buf[1] = *inp++;
            inlen--;
            if (BASE64VAL(buf[1]) == -1) break;

            buf[2] = *inp++;
            inlen--;
            if (buf[2] != '=' && BASE64VAL(buf[2]) == -1) break;

            buf[3] = *inp++;
            inlen--;
            if (buf[3] != '=' && BASE64VAL(buf[3]) == -1) break;

            *outp++ = ((BASE64VAL(buf[0]) << 2) & 0xfc) |
                    ((BASE64VAL(buf[1]) >> 4) & 0x03);
            if (buf[2] != '=') {
                  *outp++ = ((BASE64VAL(buf[1]) & 0x0f) << 4) |
                          ((BASE64VAL(buf[2]) >> 2) & 0x0f);
                  if (buf[3] != '=') {
                        *outp++ = ((BASE64VAL(buf[2]) & 0x03) << 6) |
                                 (BASE64VAL(buf[3]) & 0x3f);
                  }
            }
      }

      return outp - out;
}

Base64Decoder *base64_decoder_new(void)
{
      Base64Decoder *decoder;

      decoder = g_new0(Base64Decoder, 1);
      return decoder;
}

void base64_decoder_free(Base64Decoder *decoder)
{
      g_free(decoder);
}

gint base64_decoder_decode(Base64Decoder *decoder,
                     const gchar *in, guchar *out)
{
      gint len, total_len = 0;
      gint buf_len;
      gchar buf[4];

      g_return_val_if_fail(decoder != NULL, -1);
      g_return_val_if_fail(in != NULL, -1);
      g_return_val_if_fail(out != NULL, -1);

      buf_len = decoder->buf_len;
      memcpy(buf, decoder->buf, sizeof(buf));

      for (;;) {
            while (buf_len < 4) {
                  gchar c = *in;

                  in++;
                  if (c == '\0') break;
                  if (c == '\r' || c == '\n') continue;
                  if (c != '=' && BASE64VAL(c) == -1)
                        return -1;
                  buf[buf_len++] = c;
            }
            if (buf_len < 4 || buf[0] == '=' || buf[1] == '=') {
                  decoder->buf_len = buf_len;
                  memcpy(decoder->buf, buf, sizeof(buf));
                  return total_len;
            }
            len = base64_decode(out, buf, 4);
            out += len;
            total_len += len;
            buf_len = 0;
            if (len < 3) {
                  decoder->buf_len = 0;
                  return total_len;
            }
      }
}

#endif  // USE_BIFF

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