1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 5 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2016 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Jim Winstead <jimw@php.net> |
16 +----------------------------------------------------------------------+
17 */
18 /* $Id$ */
19
20 #include <string.h>
21
22 #include "php.h"
23 #include "base64.h"
24
25 /* {{{ base64 tables */
26 static const char base64_table[] = {
27 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
28 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
29 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
30 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
31 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0'
32 };
33
34 static const char base64_pad = '=';
35
36 static const short base64_reverse_table[256] = {
37 -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -2, -2, -1, -2, -2,
38 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
39 -1, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, -2, -2, 63,
40 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -2, -2, -2, -2, -2, -2,
41 -2, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
42 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -2, -2, -2, -2, -2,
43 -2, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
44 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -2, -2, -2, -2, -2,
45 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
46 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
47 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
48 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
49 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
50 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
51 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
52 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2
53 };
54 /* }}} */
55
56 PHPAPI unsigned char *php_base64_encode(const unsigned char *str, int length, int *ret_length) /* {{{ */
57 {
58 const unsigned char *current = str;
59 unsigned char *p;
60 unsigned char *result;
61
62 if (length < 0) {
63 if (ret_length != NULL) {
64 *ret_length = 0;
65 }
66 return NULL;
67 }
68
69 result = (unsigned char *) safe_emalloc((length + 2) / 3, 4 * sizeof(char), 1);
70 p = result;
71
72 while (length > 2) { /* keep going until we have less than 24 bits */
73 *p++ = base64_table[current[0] >> 2];
74 *p++ = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
75 *p++ = base64_table[((current[1] & 0x0f) << 2) + (current[2] >> 6)];
76 *p++ = base64_table[current[2] & 0x3f];
77
78 current += 3;
79 length -= 3; /* we just handle 3 octets of data */
80 }
81
82 /* now deal with the tail end of things */
83 if (length != 0) {
84 *p++ = base64_table[current[0] >> 2];
85 if (length > 1) {
86 *p++ = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
87 *p++ = base64_table[(current[1] & 0x0f) << 2];
88 *p++ = base64_pad;
89 } else {
90 *p++ = base64_table[(current[0] & 0x03) << 4];
91 *p++ = base64_pad;
92 *p++ = base64_pad;
93 }
94 }
95 if (ret_length != NULL) {
96 *ret_length = (int)(p - result);
97 }
98 *p = '\0';
99 return result;
100 }
101 /* }}} */
102
103 /* {{{ */
104 /* generate reverse table (do not set index 0 to 64)
105 static unsigned short base64_reverse_table[256];
106 #define rt base64_reverse_table
107 void php_base64_init(void)
108 {
109 char *s = emalloc(10240), *sp;
110 char *chp;
111 short idx;
112
113 for(ch = 0; ch < 256; ch++) {
114 chp = strchr(base64_table, ch);
115 if(ch && chp) {
116 idx = chp - base64_table;
117 if (idx >= 64) idx = -1;
118 rt[ch] = idx;
119 } else {
120 rt[ch] = -1;
121 }
122 }
123 sp = s;
124 sprintf(sp, "static const short base64_reverse_table[256] = {\n");
125 for(ch =0; ch < 256;) {
126 sp = s+strlen(s);
127 sprintf(sp, "\t% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,% 3d,\n", rt[ch+0], rt[ch+1], rt[ch+2], rt[ch+3], rt[ch+4], rt[ch+5], rt[ch+6], rt[ch+7], rt[ch+8], rt[ch+9], rt[ch+10], rt[ch+11], rt[ch+12], rt[ch+13], rt[ch+14], rt[ch+15]);
128 ch += 16;
129 }
130 sprintf(sp, "};");
131 php_error_docref(NULL TSRMLS_CC, E_NOTICE, "Reverse_table:\n%s", s);
132 efree(s);
133 }
134 */
135 /* }}} */
136
137 PHPAPI unsigned char *php_base64_decode(const unsigned char *str, int length, int *ret_length) /* {{{ */
138 {
139 return php_base64_decode_ex(str, length, ret_length, 0);
140 }
141 /* }}} */
142
143 PHPAPI unsigned char *php_base64_decode_ex(const unsigned char *str, int length, int *ret_length, zend_bool strict) /* {{{ */
144 {
145 const unsigned char *current = str;
146 int ch, i = 0, j = 0, k;
147 /* this sucks for threaded environments */
148 unsigned char *result;
149
150 result = (unsigned char *)safe_emalloc(length, 1, 1);
151
152 /* run through the whole string, converting as we go */
153 while ((ch = *current++) != '\0' && length-- > 0) {
154 if (ch == base64_pad) {
155 if (*current != '=' && ((i % 4) == 1 || (strict && length > 0))) {
156 if ((i % 4) != 1) {
157 while (isspace(*(++current))) {
158 continue;
159 }
160 if (*current == '\0') {
161 continue;
162 }
163 }
164 efree(result);
165 return NULL;
166 }
167 continue;
168 }
169
170 ch = base64_reverse_table[ch];
171 if ((!strict && ch < 0) || ch == -1) { /* a space or some other separator character, we simply skip over */
172 continue;
173 } else if (ch == -2) {
174 efree(result);
175 return NULL;
176 }
177
178 switch(i % 4) {
179 case 0:
180 result[j] = ch << 2;
181 break;
182 case 1:
183 result[j++] |= ch >> 4;
184 result[j] = (ch & 0x0f) << 4;
185 break;
186 case 2:
187 result[j++] |= ch >>2;
188 result[j] = (ch & 0x03) << 6;
189 break;
190 case 3:
191 result[j++] |= ch;
192 break;
193 }
194 i++;
195 }
196
197 k = j;
198 /* mop things up if we ended on a boundary */
199 if (ch == base64_pad) {
200 switch(i % 4) {
201 case 1:
202 efree(result);
203 return NULL;
204 case 2:
205 k++;
206 case 3:
207 result[k] = 0;
208 }
209 }
210 if(ret_length) {
211 *ret_length = j;
212 }
213 result[j] = '\0';
214 return result;
215 }
216 /* }}} */
217
218 /* {{{ proto string base64_encode(string str)
219 Encodes string using MIME base64 algorithm */
220 PHP_FUNCTION(base64_encode)
221 {
222 char *str;
223 unsigned char *result;
224 int str_len, ret_length;
225
226 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) {
227 return;
228 }
229 result = php_base64_encode((unsigned char*)str, str_len, &ret_length);
230 if (result != NULL) {
231 RETVAL_STRINGL((char*)result, ret_length, 0);
232 } else {
233 RETURN_FALSE;
234 }
235 }
236 /* }}} */
237
238 /* {{{ proto string base64_decode(string str[, bool strict])
239 Decodes string using MIME base64 algorithm */
240 PHP_FUNCTION(base64_decode)
241 {
242 char *str;
243 unsigned char *result;
244 zend_bool strict = 0;
245 int str_len, ret_length;
246
247 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|b", &str, &str_len, &strict) == FAILURE) {
248 return;
249 }
250 result = php_base64_decode_ex((unsigned char*)str, str_len, &ret_length, strict);
251 if (result != NULL) {
252 RETVAL_STRINGL((char*)result, ret_length, 0);
253 } else {
254 RETURN_FALSE;
255 }
256 }
257 /* }}} */
258
259 /*
260 * Local variables:
261 * tab-width: 4
262 * c-basic-offset: 4
263 * End:
264 * vim600: sw=4 ts=4 fdm=marker
265 * vim<600: sw=4 ts=4
266 */