1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
3 /* Copyright (C) 2001-2004 Novell, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU Lesser General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this program; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
24 #include "e2k-encoding-utils.h"
28 static const char *b64_alphabet =
29 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
34 * @len: the length of @data
36 * Base64-encodes @len bytes of data at @data.
38 * Return value: the base64-encoded representation of @data, which
39 * the caller must free.
42 e2k_base64_encode (const guint8 *data, int len)
46 p = buf = g_malloc (((len + 2) / 3) * 4 + 1);
48 p[0] = b64_alphabet[ (data[0] >> 2) & 0x3f];
49 p[1] = b64_alphabet[((data[0] << 4) & 0x30) +
50 ((data[1] >> 4) & 0x0f)];
51 p[2] = b64_alphabet[((data[1] << 2) & 0x3c) +
52 ((data[2] >> 6) & 0x03)];
53 p[3] = b64_alphabet[ data[2] & 0x3f];
62 p[0] = b64_alphabet[ (data[0] >> 2) & 0x3f];
63 p[1] = b64_alphabet[((data[0] << 4) & 0x30) +
64 ((data[1] >> 4) & 0xf)];
65 p[2] = b64_alphabet[ (data[1] << 2) & 0x3c];
70 p[0] = b64_alphabet[ (data[0] >> 2) & 0x3f];
71 p[1] = b64_alphabet[ (data[0] << 4) & 0x30];
82 static guint8 base64_unphabet[] = {
83 -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -2, -2, -2, -1, -1,
84 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
85 -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
86 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
87 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
88 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
89 -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
90 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
92 #define E2K_B64_SPACE ((guint8)-2)
93 #define E2K_B64_BAD ((guint8)-1)
97 * @string: base64-encoded data
99 * Decodes the base64-encoded data in @string.
101 * Return value: the binary data encoded in @string
104 e2k_base64_decode (const char *string)
107 int bits, length, qw = 0;
110 rc = g_byte_array_new ();
112 length = strlen (string);
116 g_byte_array_set_size (rc, ((length / 4) + 1) * 3);
119 for (; *string; string++) {
120 if ((unsigned char)*string > 127)
122 bits = base64_unphabet[(unsigned char)*string];
123 if (bits == E2K_B64_BAD)
125 else if (bits == E2K_B64_SPACE)
130 data[0] = (bits << 2) & 0xfc;
133 data[0] |= (bits >> 4) & 0x03;
134 data[1] = (bits << 4) & 0xf0;
137 data[1] |= (bits >> 2) & 0x0f;
138 data[2] = (bits << 6) & 0xc0;
141 data[2] |= bits & 0x3f;
148 rc->len = data - rc->data;