text: /*
     +----------------------------------------------------------------------+
     | PHP Version 5                                                        |
     +----------------------------------------------------------------------+
     | Copyright (c) 1997-2011 The PHP Group                                |
     +----------------------------------------------------------------------+
     | This source file is subject to version 3.01 of the PHP license,      |
     | that is bundled with this package in the file LICENSE, and is        |
     | available through the world-wide-web at the following url:           |
     | http://www.php.net/license/3_01.txt                                  |
     | If you did not receive a copy of the PHP license and are unable to   |
     | obtain it through the world-wide-web, please send a note to          |
     | license@php.net so we can mail you a copy immediately.               |
     +----------------------------------------------------------------------+
     | Author: Jim Winstead <jimw@php.net>                                  |
     +----------------------------------------------------------------------+
   */
  /* $Id$ */
  
  #include <string.h>
  
  #include "php.h"
  #include "base64.h"
  
  /* {{{ base64 tables */
  static const char base64_table[] = {
  	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
  	'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
  	'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
  	'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
  	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0'
  };
  
  static const char base64_pad = '=';
  
  static const short base64_reverse_table[256] = {
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -2, -2, -1, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
  	-1, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, -2, -2, 63,
  	52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -2, -2, -2, -2, -2, -2,
  	-2,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
  	15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -2, -2, -2, -2, -2,
  	-2, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
  	41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -2, -2, -2, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
  	-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2
  };
  /* }}} */
  
  PHPAPI unsigned char *php_base64_encode(const unsigned char *str, int length, int *ret_length) /* {{{ */
  {
  	const unsigned char *current = str;
  	unsigned char *p;
  	unsigned char *result;
  
  	if ((length + 2) < 0 || ((length + 2) / 3) >= (1 << (sizeof(int) * 8 - 2))) {
  		if (ret_length != NULL) {
  			*ret_length = 0;
  		}
  		return NULL;
  	}
  
  	result = (unsigned char *)safe_emalloc(((length + 2) / 3) * 4, sizeof(char), 1);
  	p = result;
  
  	while (length > 2) { /* keep going until we have less than 24 bits */
  		*p++ = base64_table[current[0] >> 2];
  		*p++ = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
  		*p++ = base64_table[((current[1] & 0x0f) << 2) + (current[2] >> 6)];
  		*p++ = base64_table[current[2] & 0x3f];
  
  		current += 3;
  		length -= 3; /* we just handle 3 octets of data */
  	}
  
  	/* now deal with the tail end of things */
  	if (length != 0) {
  		*p++ = base64_table[current[0] >> 2];
  		if (length > 1) {
  			*p++ = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
  			*p++ = base64_table[(current[1] & 0x0f) << 2];
  			*p++ = base64_pad;
  		} else {
  			*p++ = base64_table[(current[0] & 0x03) << 4];
  			*p++ = base64_pad;
  			*p++ = base64_pad;
  		}
  	}
  	if (ret_length != NULL) {
  		*ret_length = (int)(p - result);
  	}
  	*p = '\0';
  	return result;
  }
  /* }}} */
  
  /* {{{ */
  /* generate reverse table (do not set index 0 to 64)
  static unsigned short base64_reverse_table[256];
  #define rt base64_reverse_table
  void php_base64_init(void)
  {
  	char *s = emalloc(10240), *sp;
  	char *chp;
  	short idx;
  
  	for(ch = 0; ch < 256; ch++) {
  		chp = strchr(base64_table, ch);
  		if(ch && chp) {
  			idx = chp - base64_table;
  			if (idx >= 64) idx = -1;
  			rt[ch] = idx;
  		} else {
  			rt[ch] = -1;
  		}
  	}
  	sp = s;
  	sprintf(sp, "static const short base64_reverse_table[256] = {\n");
  	for(ch =0; ch < 256;) {
  		sp = s+strlen(s);
  		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]);
  		ch += 16;
  	}
  	sprintf(sp, "};");
  	php_error_docref(NULL TSRMLS_CC, E_NOTICE, "Reverse_table:\n%s", s);
  	efree(s);
  }
  */
  /* }}} */
  
  PHPAPI unsigned char *php_base64_decode(const unsigned char *str, int length, int *ret_length) /* {{{ */
  {
  	return php_base64_decode_ex(str, length, ret_length, 0);
  }
  /* }}} */
  
  PHPAPI unsigned char *php_base64_decode_ex(const unsigned char *str, int length, int *ret_length, zend_bool strict) /* {{{ */
  {
  	const unsigned char *current = str;
  	int ch, i = 0, j = 0, k;
  	/* this sucks for threaded environments */
  	unsigned char *result;
  
  	result = (unsigned char *)safe_emalloc(length, 1, 1);
  
  	/* run through the whole string, converting as we go */
  	while ((ch = *current++) != '\0' && length-- > 0) {
  		if (ch == base64_pad) {
  			if (*current != '=' && ((i % 4) == 1 || (strict && length > 0))) {
  				efree(result);
  				return NULL;
  			}
  			continue;
  		}
  
  		ch = base64_reverse_table[ch];
  		if ((!strict && ch < 0) || ch == -1) { /* a space or some other separator character, we simply skip over */
  			continue;
  		} else if (ch == -2) {
  			efree(result);
  			return NULL;
  		}
  
  		switch(i % 4) {
  		case 0:
  			result[j] = ch << 2;
  			break;
  		case 1:
  			result[j++] |= ch >> 4;
  			result[j] = (ch & 0x0f) << 4;
  			break;
  		case 2:
  			result[j++] |= ch >>2;
  			result[j] = (ch & 0x03) << 6;
  			break;
  		case 3:
  			result[j++] |= ch;
  			break;
  		}
  		i++;
  	}
  
  	k = j;
  	/* mop things up if we ended on a boundary */
  	if (ch == base64_pad) {
  		switch(i % 4) {
  		case 1:
  			efree(result);
  			return NULL;
  		case 2:
  			k++;
  		case 3:
  			result[k] = 0;
  		}
  	}
  	if(ret_length) {
  		*ret_length = j;
  	}
  	result[j] = '\0';
  	return result;
  }
  /* }}} */
  
  /* {{{ proto string base64_encode(string str)
     Encodes string using MIME base64 algorithm */
  PHP_FUNCTION(base64_encode)
  {
  	char *str;
  	unsigned char *result;
  	int str_len, ret_length;
  
  	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) {
  		return;
  	}
  	result = php_base64_encode((unsigned char*)str, str_len, &ret_length);
  	if (result != NULL) {
  		RETVAL_STRINGL((char*)result, ret_length, 0);
  	} else {
  		RETURN_FALSE;
  	}
  }
  /* }}} */
  
  /* {{{ proto string base64_decode(string str[, bool strict])
     Decodes string using MIME base64 algorithm */
  PHP_FUNCTION(base64_decode)
  {
  	char *str;
  	unsigned char *result;
  	zend_bool strict = 0;
  	int str_len, ret_length;
  
  	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|b", &str, &str_len, &strict) == FAILURE) {
  		return;
  	}
  	result = php_base64_decode_ex((unsigned char*)str, str_len, &ret_length, strict);
  	if (result != NULL) {
  		RETVAL_STRINGL((char*)result, ret_length, 0);
  	} else {
  		RETURN_FALSE;
  	}
  }
  /* }}} */
  
  /*
   * Local variables:
   * tab-width: 4
   * c-basic-offset: 4
   * End:
   * vim600: sw=4 ts=4 fdm=marker
   * vim<600: sw=4 ts=4
   */
  