dovecot: Rewrote base64 functions so they're now MIT licensed.
dovecot at dovecot.org
dovecot at dovecot.org
Sat Sep 22 23:14:34 EEST 2007
details: http://hg.dovecot.org/dovecot/rev/c02c7912fb15
changeset: 6482:c02c7912fb15
user: Timo Sirainen <tss at iki.fi>
date: Sat Sep 22 23:14:30 2007 +0300
description:
Rewrote base64 functions so they're now MIT licensed.
diffstat:
1 file changed, 95 insertions(+), 127 deletions(-)
src/lib/base64.c | 222 +++++++++++++++++++++++-------------------------------
diffs (260 lines):
diff -r e81e56e67ba1 -r c02c7912fb15 src/lib/base64.c
--- a/src/lib/base64.c Sat Sep 22 19:40:43 2007 +0300
+++ b/src/lib/base64.c Sat Sep 22 23:14:30 2007 +0300
@@ -1,104 +1,83 @@
-/* Based on the sources of Cyrus IMAP:
- *
- * Copyright (c) 2000 Carnegie Mellon University. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The name "Carnegie Mellon University" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For permission or any other legal
- * details, please contact
- * Office of Technology Transfer
- * Carnegie Mellon University
- * 5000 Forbes Avenue
- * Pittsburgh, PA 15213-3890
- * (412) 268-4387, fax: (412) 268-7395
- * tech-transfer at andrew.cmu.edu
- *
- * 4. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by Computing Services
- * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
- *
- * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
- * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
- * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
- * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
- * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
+/* Copyright (c) 2007 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "base64.h"
#include "buffer.h"
-static const char basis_64[] =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+static const char b64enc[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static const unsigned char b64dec[256] = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0-7 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 8-15 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16-23 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 24-31 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32-39 */
+ 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f, /* 40-47 */
+ 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, /* 48-55 */
+ 0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 56-63 */
+ 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, /* 64-71 */
+ 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, /* 72-79 */
+ 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, /* 80-87 */
+ 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff, /* 88-95 */
+ 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, /* 96-103 */
+ 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, /* 104-111 */
+ 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, /* 112-119 */
+ 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff, /* 120-127 */
+
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 128-255 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+};
void base64_encode(const void *src, size_t src_size, buffer_t *dest)
{
const unsigned char *src_c = src;
+ unsigned char tmp[4];
size_t src_pos;
- int c1, c2, c3;
for (src_pos = 0; src_pos < src_size; ) {
- c1 = src_c[src_pos++];
- buffer_append_c(dest, basis_64[c1 >> 2]);
-
- c2 = src_pos == src_size ? 0 : src_c[src_pos];
- buffer_append_c(dest, basis_64[((c1 & 0x03) << 4) |
- ((c2 & 0xf0) >> 4)]);
-
- if (src_pos++ == src_size) {
- buffer_append(dest, "==", 2);
+ tmp[0] = b64enc[src_c[src_pos] >> 2];
+ switch (src_size - src_pos) {
+ case 1:
+ tmp[1] = b64enc[(src_c[src_pos] & 0x03) << 4];
+ tmp[2] = '=';
+ tmp[3] = '=';
+ src_pos++;
+ break;
+ case 2:
+ tmp[1] = b64enc[((src_c[src_pos] & 0x03) << 4) |
+ ((src_c[src_pos+1] & 0xf0) >> 4)];
+ tmp[2] = b64enc[((src_c[src_pos+1] & 0x0f) << 2) |
+ ((src_c[src_pos+2] & 0xc0) >> 6)];
+ tmp[3] = '=';
+ src_pos += 2;
+ break;
+ default:
+ tmp[1] = b64enc[((src_c[src_pos] & 0x03) << 4) |
+ ((src_c[src_pos+1] & 0xf0) >> 4)];
+ tmp[2] = b64enc[((src_c[src_pos+1] & 0x0f) << 2) |
+ ((src_c[src_pos+2] & 0xc0) >> 6)];
+ tmp[3] = b64enc[src_c[src_pos+2] & 0x3f];
+ src_pos += 3;
break;
}
-
- c3 = src_pos == src_size ? 0 : src_c[src_pos];
- buffer_append_c(dest, basis_64[((c2 & 0x0f) << 2) |
- ((c3 & 0xc0) >> 6)]);
-
- if (src_pos++ == src_size) {
- buffer_append_c(dest, '=');
- break;
- }
-
- buffer_append_c(dest, basis_64[c3 & 0x3f]);
+ buffer_append(dest, tmp, 4);
}
}
-
-#define XX 127
-
-/* Table for decoding base64 */
-static const char index_64[256] = {
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,62, XX,XX,XX,63,
- 52,53,54,55, 56,57,58,59, 60,61,XX,XX, XX,XX,XX,XX,
- XX, 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,XX, XX,XX,XX,XX,
- XX,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,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
- XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
-};
#define IS_EMPTY(c) \
((c) == '\n' || (c) == '\r' || (c) == ' ' || (c) == '\t')
@@ -108,56 +87,45 @@ int base64_decode(const void *src, size_
{
const unsigned char *src_c = src;
size_t src_pos;
- unsigned char buf[4];
- int c1, c2, c3, c4;
- size_t size;
+ unsigned char input[4], output[3];
int ret = 1;
- for (src_pos = 0; src_pos+3 < src_size; ) {
- c1 = src_c[src_pos++];
-
- if (IS_EMPTY(c1))
- continue;
-
- if (index_64[c1] == XX)
+ for (src_pos = 0; src_pos+3 < src_size; src_pos += 4) {
+ input[0] = b64dec[src_c[src_pos]];
+ if (input[0] == 0xff) {
+ if (IS_EMPTY(src_c[src_pos++]))
+ continue;
return -1;
-
- c2 = src_c[src_pos++];
- if (index_64[c2] == XX)
- return -1;
-
- c3 = src_c[src_pos++];
- if (c3 != '=' && index_64[c3] == XX)
- return -1;
-
- c4 = src_c[src_pos++];
- if (c4 != '=' && index_64[c4] == XX)
- return -1;
-
- buf[0] = (index_64[c1] << 2) | ((index_64[c2] & 0x30) >> 4);
- if (c3 == '=') {
- if (c4 != '=')
- return -1;
- size = 1;
- } else {
- buf[1] = ((index_64[c2] & 0xf) << 4) |
- ((index_64[c3] & 0x3c) >> 2);
-
- if (c4 == '=')
- size = 2;
- else {
- buf[2] = ((index_64[c3] & 0x3) << 6) |
- index_64[c4];
- size = 3;
- }
}
- buffer_append(dest, buf, size);
- if (size < 3) {
- /* end of base64 data */
+ input[1] = b64dec[src_c[src_pos+1]];
+ if (input[1] == 0xff)
+ return -1;
+ output[0] = (input[0] << 2) | (input[1] >> 4);
+
+ input[2] = b64dec[src_c[src_pos+2]];
+ if (input[2] == 0xff) {
+ if (src_c[src_pos+2] != '=' || src_c[src_pos+3] != '=')
+ return -1;
+ buffer_append(dest, output, 1);
ret = 0;
+ src_pos += 4;
break;
}
+
+ output[1] = (input[1] << 4) | (input[2] >> 2);
+ input[3] = b64dec[src_c[src_pos+3]];
+ if (input[3] == 0xff) {
+ if (src_c[src_pos+3] != '=')
+ return -1;
+ buffer_append(dest, output, 2);
+ ret = 0;
+ src_pos += 4;
+ break;
+ }
+
+ output[2] = ((input[2] << 6) & 0xc0) | input[3];
+ buffer_append(dest, output, 3);
}
for (; src_pos < src_size; src_pos++) {
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