Mercurial > dovecot > core-2.2

annotate src/lib/base64.c @ 23007:36e01285b5b8

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lib: buffer - Improve header comment for buffer_insert() and buffer_delete().
author Stephan Bosch <stephan.bosch@dovecot.fi>
date Mon, 18 Mar 2019 00:52:37 +0100
parents cb108f786fb4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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cb108f786fb4 Updated copyright notices to include the year 2018.
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1 /* Copyright (c) 2007-2018 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "base64.h"
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5 #include "buffer.h"
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6
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7 static const char b64enc[] =
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8 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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9
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10 static const unsigned char b64dec[256] = {
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11 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0-7 */
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12 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 8-15 */
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13 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16-23 */
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14 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 24-31 */
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15 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32-39 */
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16 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f, /* 40-47 */
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17 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, /* 48-55 */
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18 0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 56-63 */
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19 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, /* 64-71 */
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20 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, /* 72-79 */
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21 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, /* 80-87 */
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22 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff, /* 88-95 */
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23 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, /* 96-103 */
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24 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, /* 104-111 */
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25 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, /* 112-119 */
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26 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff, /* 120-127 */
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27
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28 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 128-255 */
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29 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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30 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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31 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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32 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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33 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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34 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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35 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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36 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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37 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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38 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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39 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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40 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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41 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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42 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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43 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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44 };
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45
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46 void base64_encode(const void *src, size_t src_size, buffer_t *dest)
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47 {
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48 const unsigned char *src_c = src;
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49 unsigned char tmp[4];
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50 size_t src_pos;
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51
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52 for (src_pos = 0; src_pos < src_size; ) {
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53 tmp[0] = b64enc[src_c[src_pos] >> 2];
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54 switch (src_size - src_pos) {
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55 case 1:
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56 tmp[1] = b64enc[(src_c[src_pos] & 0x03) << 4];
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57 tmp[2] = '=';
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58 tmp[3] = '=';
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59 src_pos++;
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60 break;
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61 case 2:
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62 tmp[1] = b64enc[((src_c[src_pos] & 0x03) << 4) |
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63 (src_c[src_pos+1] >> 4)];
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64 tmp[2] = b64enc[((src_c[src_pos+1] & 0x0f) << 2)];
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65 tmp[3] = '=';
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66 src_pos += 2;
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67 break;
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68 default:
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69 tmp[1] = b64enc[((src_c[src_pos] & 0x03) << 4) |
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70 (src_c[src_pos+1] >> 4)];
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71 tmp[2] = b64enc[((src_c[src_pos+1] & 0x0f) << 2) |
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72 ((src_c[src_pos+2] & 0xc0) >> 6)];
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73 tmp[3] = b64enc[src_c[src_pos+2] & 0x3f];
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74 src_pos += 3;
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75 break;
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76 }
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77 buffer_append(dest, tmp, 4);
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78 }
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79 }
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80
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81 #define IS_EMPTY(c) \
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82 ((c) == '\n' || (c) == '\r' || (c) == ' ' || (c) == '\t')
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83
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84 int base64_decode(const void *src, size_t src_size,
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85 size_t *src_pos_r, buffer_t *dest)
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86 {
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87 const unsigned char *src_c = src;
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88 size_t src_pos;
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89 unsigned char input[4], output[3];
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90 int ret = 1;
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91
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92 for (src_pos = 0; src_pos+3 < src_size; ) {
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93 input[0] = b64dec[src_c[src_pos]];
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94 if (input[0] == 0xff) {
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95 if (unlikely(!IS_EMPTY(src_c[src_pos]))) {
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96 ret = -1;
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97 break;
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98 }
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99 src_pos++;
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100 continue;
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101 }
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102
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103 input[1] = b64dec[src_c[src_pos+1]];
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104 if (unlikely(input[1] == 0xff)) {
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105 ret = -1;
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106 break;
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107 }
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108 output[0] = (input[0] << 2) | (input[1] >> 4);
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109
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110 input[2] = b64dec[src_c[src_pos+2]];
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111 if (input[2] == 0xff) {
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112 if (unlikely(src_c[src_pos+2] != '=' ||
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113 src_c[src_pos+3] != '=')) {
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114 ret = -1;
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115 break;
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116 }
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117 buffer_append(dest, output, 1);
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118 ret = 0;
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119 src_pos += 4;
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120 break;
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121 }
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122
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123 output[1] = (input[1] << 4) | (input[2] >> 2);
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124 input[3] = b64dec[src_c[src_pos+3]];
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125 if (input[3] == 0xff) {
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126 if (unlikely(src_c[src_pos+3] != '=')) {
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cfdf3b2e3dd3 base64_decode(): Update src_pos_r even if we return -1.
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diff changeset
127 ret = -1;
cfdf3b2e3dd3 base64_decode(): Update src_pos_r even if we return -1.
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128 break;
cfdf3b2e3dd3 base64_decode(): Update src_pos_r even if we return -1.
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diff changeset
129 }
6482
c02c7912fb15 Rewrote base64 functions so they're now MIT licensed.
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diff changeset
130 buffer_append(dest, output, 2);
c02c7912fb15 Rewrote base64 functions so they're now MIT licensed.
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diff changeset
131 ret = 0;
c02c7912fb15 Rewrote base64 functions so they're now MIT licensed.
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parents: 6180
diff changeset
132 src_pos += 4;
c02c7912fb15 Rewrote base64 functions so they're now MIT licensed.
Timo Sirainen <tss@iki.fi>
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diff changeset
133 break;
c02c7912fb15 Rewrote base64 functions so they're now MIT licensed.
Timo Sirainen <tss@iki.fi>
parents: 6180
diff changeset
134 }
c02c7912fb15 Rewrote base64 functions so they're now MIT licensed.
Timo Sirainen <tss@iki.fi>
parents: 6180
diff changeset
135
c02c7912fb15 Rewrote base64 functions so they're now MIT licensed.
Timo Sirainen <tss@iki.fi>
parents: 6180
diff changeset
136 output[2] = ((input[2] << 6) & 0xc0) | input[3];
c02c7912fb15 Rewrote base64 functions so they're now MIT licensed.
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diff changeset
137 buffer_append(dest, output, 3);
6605
d81a50101724 Whitespace skipping was broken.
Timo Sirainen <tss@iki.fi>
parents: 6482
diff changeset
138 src_pos += 4;
0
3b1985cbc908 Initial revision
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
139 }
3b1985cbc908 Initial revision
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
140
5508
d1168da66050 Skip trailing linefeeds/whitespace.
Timo Sirainen <tss@iki.fi>
parents: 2708
diff changeset
141 for (; src_pos < src_size; src_pos++) {
d1168da66050 Skip trailing linefeeds/whitespace.
Timo Sirainen <tss@iki.fi>
parents: 2708
diff changeset
142 if (!IS_EMPTY(src_c[src_pos]))
d1168da66050 Skip trailing linefeeds/whitespace.
Timo Sirainen <tss@iki.fi>
parents: 2708
diff changeset
143 break;
d1168da66050 Skip trailing linefeeds/whitespace.
Timo Sirainen <tss@iki.fi>
parents: 2708
diff changeset
144 }
d1168da66050 Skip trailing linefeeds/whitespace.
Timo Sirainen <tss@iki.fi>
parents: 2708
diff changeset
145
765
553f050c8313 Added buffer API. Point is to hide all buffer writing behind this API which
Timo Sirainen <tss@iki.fi>
parents: 608
diff changeset
146 if (src_pos_r != NULL)
553f050c8313 Added buffer API. Point is to hide all buffer writing behind this API which
Timo Sirainen <tss@iki.fi>
parents: 608
diff changeset
147 *src_pos_r = src_pos;
553f050c8313 Added buffer API. Point is to hide all buffer writing behind this API which
Timo Sirainen <tss@iki.fi>
parents: 608
diff changeset
148
5509
c46a29e0ea9d API change: Returns now 1 if ok, 0 if end of base64 marker found.
Timo Sirainen <tss@iki.fi>
parents: 5508
diff changeset
149 return ret;
0
3b1985cbc908 Initial revision
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
150 }
6180
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
151
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
152 buffer_t *t_base64_decode_str(const char *str)
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
153 {
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
154 buffer_t *buf;
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
155 size_t len = strlen(str);
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
156
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
157 buf = buffer_create_dynamic(pool_datastack_create(),
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
158 MAX_BASE64_DECODED_SIZE(len));
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
159 (void)base64_decode(str, len, NULL, buf);
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
160 return buf;
6b0fe0f93896 Added t_base64_decode_str().
Timo Sirainen <tss@iki.fi>
parents: 5509
diff changeset
161 }
12038
f0d3d7eb0604 Added base64_is_valid_char()
Timo Sirainen <tss@iki.fi>
parents: 10582
diff changeset
162
f0d3d7eb0604 Added base64_is_valid_char()
Timo Sirainen <tss@iki.fi>
parents: 10582
diff changeset
163 bool base64_is_valid_char(char c)
f0d3d7eb0604 Added base64_is_valid_char()
Timo Sirainen <tss@iki.fi>
parents: 10582
diff changeset
164 {
f0d3d7eb0604 Added base64_is_valid_char()
Timo Sirainen <tss@iki.fi>
parents: 10582
diff changeset
165 return b64dec[(uint8_t)c] != 0xff;
f0d3d7eb0604 Added base64_is_valid_char()
Timo Sirainen <tss@iki.fi>
parents: 10582
diff changeset
166 }