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
php_base64_encode(const unsigned char * str,int length,int * ret_length)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 if (((size_t)length + 2) / 3 > INT_MAX/4 ) {
70 TSRMLS_FETCH();
71 php_error_docref(NULL TSRMLS_CC, E_WARNING, "String too long, maximum is %d", INT_MAX/4);
72 return NULL;
73 }
74
75 result = (unsigned char *) safe_emalloc((length + 2) / 3, 4 * sizeof(char), 1);
76 p = result;
77
78 while (length > 2) { /* keep going until we have less than 24 bits */
79 *p++ = base64_table[current[0] >> 2];
80 *p++ = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
81 *p++ = base64_table[((current[1] & 0x0f) << 2) + (current[2] >> 6)];
82 *p++ = base64_table[current[2] & 0x3f];
83
84 current += 3;
85 length -= 3; /* we just handle 3 octets of data */
86 }
87
88 /* now deal with the tail end of things */
89 if (length != 0) {
90 *p++ = base64_table[current[0] >> 2];
91 if (length > 1) {
92 *p++ = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
93 *p++ = base64_table[(current[1] & 0x0f) << 2];
94 *p++ = base64_pad;
95 } else {
96 *p++ = base64_table[(current[0] & 0x03) << 4];
97 *p++ = base64_pad;
98 *p++ = base64_pad;
99 }
100 }
101 if (ret_length != NULL) {
102 *ret_length = (int)(p - result);
103 }
104 *p = '\0';
105 return result;
106 }
107 /* }}} */
108
109 /* {{{ */
110 /* generate reverse table (do not set index 0 to 64)
111 static unsigned short base64_reverse_table[256];
112 #define rt base64_reverse_table
113 void php_base64_init(void)
114 {
115 char *s = emalloc(10240), *sp;
116 char *chp;
117 short idx;
118
119 for(ch = 0; ch < 256; ch++) {
120 chp = strchr(base64_table, ch);
121 if(ch && chp) {
122 idx = chp - base64_table;
123 if (idx >= 64) idx = -1;
124 rt[ch] = idx;
125 } else {
126 rt[ch] = -1;
127 }
128 }
129 sp = s;
130 sprintf(sp, "static const short base64_reverse_table[256] = {\n");
131 for(ch =0; ch < 256;) {
132 sp = s+strlen(s);
133 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]);
134 ch += 16;
135 }
136 sprintf(sp, "};");
137 php_error_docref(NULL TSRMLS_CC, E_NOTICE, "Reverse_table:\n%s", s);
138 efree(s);
139 }
140 */
141 /* }}} */
142
php_base64_decode(const unsigned char * str,int length,int * ret_length)143 PHPAPI unsigned char *php_base64_decode(const unsigned char *str, int length, int *ret_length) /* {{{ */
144 {
145 return php_base64_decode_ex(str, length, ret_length, 0);
146 }
147 /* }}} */
148
php_base64_decode_ex(const unsigned char * str,int length,int * ret_length,zend_bool strict)149 PHPAPI unsigned char *php_base64_decode_ex(const unsigned char *str, int length, int *ret_length, zend_bool strict) /* {{{ */
150 {
151 const unsigned char *current = str;
152 int ch, i = 0, j = 0, k;
153 /* this sucks for threaded environments */
154 unsigned char *result;
155
156 result = (unsigned char *)safe_emalloc(length, 1, 1);
157
158 /* run through the whole string, converting as we go */
159 while ((ch = *current++) != '\0' && length-- > 0) {
160 if (ch == base64_pad) {
161 if (*current != '=' && ((i % 4) == 1 || (strict && length > 0))) {
162 if ((i % 4) != 1) {
163 while (isspace(*(++current))) {
164 continue;
165 }
166 if (*current == '\0') {
167 continue;
168 }
169 }
170 efree(result);
171 return NULL;
172 }
173 continue;
174 }
175
176 ch = base64_reverse_table[ch];
177 if ((!strict && ch < 0) || ch == -1) { /* a space or some other separator character, we simply skip over */
178 continue;
179 } else if (ch == -2) {
180 efree(result);
181 return NULL;
182 }
183
184 switch(i % 4) {
185 case 0:
186 result[j] = ch << 2;
187 break;
188 case 1:
189 result[j++] |= ch >> 4;
190 result[j] = (ch & 0x0f) << 4;
191 break;
192 case 2:
193 result[j++] |= ch >>2;
194 result[j] = (ch & 0x03) << 6;
195 break;
196 case 3:
197 result[j++] |= ch;
198 break;
199 }
200 i++;
201 }
202
203 k = j;
204 /* mop things up if we ended on a boundary */
205 if (ch == base64_pad) {
206 switch(i % 4) {
207 case 1:
208 efree(result);
209 return NULL;
210 case 2:
211 k++;
212 case 3:
213 result[k] = 0;
214 }
215 }
216 if(ret_length) {
217 *ret_length = j;
218 }
219 result[j] = '\0';
220 return result;
221 }
222 /* }}} */
223
224 /* {{{ proto string base64_encode(string str)
225 Encodes string using MIME base64 algorithm */
PHP_FUNCTION(base64_encode)226 PHP_FUNCTION(base64_encode)
227 {
228 char *str;
229 unsigned char *result;
230 int str_len, ret_length;
231
232 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) {
233 return;
234 }
235 result = php_base64_encode((unsigned char*)str, str_len, &ret_length);
236 if (result != NULL) {
237 RETVAL_STRINGL((char*)result, ret_length, 0);
238 } else {
239 RETURN_FALSE;
240 }
241 }
242 /* }}} */
243
244 /* {{{ proto string base64_decode(string str[, bool strict])
245 Decodes string using MIME base64 algorithm */
PHP_FUNCTION(base64_decode)246 PHP_FUNCTION(base64_decode)
247 {
248 char *str;
249 unsigned char *result;
250 zend_bool strict = 0;
251 int str_len, ret_length;
252
253 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|b", &str, &str_len, &strict) == FAILURE) {
254 return;
255 }
256 result = php_base64_decode_ex((unsigned char*)str, str_len, &ret_length, strict);
257 if (result != NULL) {
258 RETVAL_STRINGL((char*)result, ret_length, 0);
259 } else {
260 RETURN_FALSE;
261 }
262 }
263 /* }}} */
264
265 /*
266 * Local variables:
267 * tab-width: 4
268 * c-basic-offset: 4
269 * End:
270 * vim600: sw=4 ts=4 fdm=marker
271 * vim<600: sw=4 ts=4
272 */
273
