base64-test: Remove posibility of returning restricted exit codes
[libav.git] / libavutil / base64.c
1 /*
2 * Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * @brief Base64 encode/decode
24 * @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
25 */
26
27 #include "common.h"
28 #include "base64.h"
29
30 /* ---------------- private code */
31 static const uint8_t map2[] =
32 {
33 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
34 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
35 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
36 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
37 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
38 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
39 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
40 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
41 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
42 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
43 };
44
45 int av_base64_decode(uint8_t *out, const char *in, int out_size)
46 {
47 int i;
48 unsigned v = 0;
49 uint8_t *dst = out;
50
51 for (i = 0; in[i] && in[i] != '='; i++) {
52 unsigned int index= in[i]-43;
53 if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff)
54 return -1;
55 v = (v << 6) + map2[index];
56 if (i & 3) {
57 if (dst - out < out_size) {
58 *dst++ = v >> (6 - 2 * (i & 3));
59 }
60 }
61 }
62
63 return dst - out;
64 }
65
66 /*****************************************************************************
67 * b64_encode: Stolen from VLC's http.c.
68 * Simplified by Michael.
69 * Fixed edge cases and made it work from data (vs. strings) by Ryan.
70 *****************************************************************************/
71
72 char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
73 {
74 static const char b64[] =
75 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
76 char *ret, *dst;
77 unsigned i_bits = 0;
78 int i_shift = 0;
79 int bytes_remaining = in_size;
80
81 if (in_size >= UINT_MAX / 4 ||
82 out_size < AV_BASE64_SIZE(in_size))
83 return NULL;
84 ret = dst = out;
85 while (bytes_remaining) {
86 i_bits = (i_bits << 8) + *in++;
87 bytes_remaining--;
88 i_shift += 8;
89
90 do {
91 *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
92 i_shift -= 6;
93 } while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
94 }
95 while ((dst - ret) & 3)
96 *dst++ = '=';
97 *dst = '\0';
98
99 return ret;
100 }
101
102 #ifdef TEST
103
104 #define MAX_DATA_SIZE 1024
105 #define MAX_ENCODED_SIZE 2048
106
107 static int test_encode_decode(const uint8_t *data, unsigned int data_size,
108 const char *encoded_ref)
109 {
110 char encoded[MAX_ENCODED_SIZE];
111 uint8_t data2[MAX_DATA_SIZE];
112 int data2_size, max_data2_size = MAX_DATA_SIZE;
113
114 if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) {
115 printf("Failed: cannot encode the input data\n");
116 return 1;
117 }
118 if (encoded_ref && strcmp(encoded, encoded_ref)) {
119 printf("Failed: encoded string differs from reference\n"
120 "Encoded:\n%s\nReference:\n%s\n", encoded, encoded_ref);
121 return 1;
122 }
123
124 if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) < 0) {
125 printf("Failed: cannot decode the encoded string\n"
126 "Encoded:\n%s\n", encoded);
127 return 1;
128 }
129 if (memcmp(data2, data, data_size)) {
130 printf("Failed: encoded/decoded data differs from original data\n");
131 return 1;
132 }
133
134 printf("Passed!\n");
135 return 0;
136 }
137
138 int main(void)
139 {
140 int i, error_count = 0;
141 struct test {
142 const uint8_t *data;
143 const char *encoded_ref;
144 } tests[] = {
145 { "", ""},
146 { "1", "MQ=="},
147 { "22", "MjI="},
148 { "333", "MzMz"},
149 { "4444", "NDQ0NA=="},
150 { "55555", "NTU1NTU="},
151 { "666666", "NjY2NjY2"},
152 { "abc:def", "YWJjOmRlZg=="},
153 };
154
155 printf("Encoding/decoding tests\n");
156 for (i = 0; i < FF_ARRAY_ELEMS(tests); i++)
157 error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref);
158
159 if (error_count)
160 printf("Error Count: %d.\n", error_count);
161
162 return !!error_count;
163 }
164
165 #endif