Annotation of embedaddon/php/ext/standard/base64.c, revision 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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