Annotation of embedaddon/php/ext/standard/base64.c, revision 1.1.1.1
1.1 misho 1: /*
2: +----------------------------------------------------------------------+
3: | PHP Version 5 |
4: +----------------------------------------------------------------------+
5: | Copyright (c) 1997-2012 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: base64.c 321634 2012-01-01 13:15:04Z felipe $ */
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 + 2) < 0 || ((length + 2) / 3) >= (1 << (sizeof(int) * 8 - 2))) {
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: */
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