diff options
Diffstat (limited to 'ext/standard/base64.c')
| -rw-r--r-- | ext/standard/base64.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/ext/standard/base64.c b/ext/standard/base64.c new file mode 100644 index 0000000000..392f2451ac --- /dev/null +++ b/ext/standard/base64.c @@ -0,0 +1,197 @@ +/* + +----------------------------------------------------------------------+ + | PHP HTML Embedded Scripting Language Version 3.0 | + +----------------------------------------------------------------------+ + | Copyright (c) 1997,1998 PHP Development Team (See Credits file) | + +----------------------------------------------------------------------+ + | This program is free software; you can redistribute it and/or modify | + | it under the terms of one of the following licenses: | + | | + | A) the GNU General Public License as published by the Free Software | + | Foundation; either version 2 of the License, or (at your option) | + | any later version. | + | | + | B) the PHP License as published by the PHP Development Team and | + | included in the distribution in the file: LICENSE | + | | + | This program is distributed in the hope that it will be useful, | + | but WITHOUT ANY WARRANTY; without even the implied warranty of | + | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | + | GNU General Public License for more details. | + | | + | You should have received a copy of both licenses referred to here. | + | If you did not, or have any questions about PHP licensing, please | + | contact core@php.net. | + +----------------------------------------------------------------------+ + | Author: Jim Winstead (jimw@php.net) | + +----------------------------------------------------------------------+ + */ +/* $Id$ */ + +#ifdef THREAD_SAFE +#include "tls.h" +#endif +#include <string.h> + +#include "php.h" +#include "base64.h" + +static 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 char base64_pad = '='; + +unsigned char *_php3_base64_encode(const unsigned char *string, int length, int *ret_length) { + const unsigned char *current = string; + int i = 0; + unsigned char *result = (unsigned char *)emalloc(((length + 3 - length % 3) * 4 / 3 + 1) * sizeof(char)); + + while (length > 2) { /* keep going until we have less than 24 bits */ + result[i++] = base64_table[current[0] >> 2]; + result[i++] = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)]; + result[i++] = base64_table[((current[1] & 0x0f) << 2) + (current[2] >> 6)]; + result[i++] = 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) { + result[i++] = base64_table[current[0] >> 2]; + if (length > 1) { + result[i++] = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)]; + result[i++] = base64_table[(current[1] & 0x0f) << 2]; + result[i++] = base64_pad; + } + else { + result[i++] = base64_table[(current[0] & 0x03) << 4]; + result[i++] = base64_pad; + result[i++] = base64_pad; + } + } + if(ret_length) { + *ret_length = i; + } + result[i] = '\0'; + return result; +} + +/* as above, but backwards. :) */ +unsigned char *_php3_base64_decode(const unsigned char *string, int length, int *ret_length) { + const unsigned char *current = string; + int ch, i = 0, j = 0, k; + + unsigned char *result = (unsigned char *)emalloc((length / 4 * 3 + 1) * sizeof(char)); + if (result == NULL) { + return NULL; + } + + /* run through the whole string, converting as we go */ + while ((ch = *current++) != '\0') { + if (ch == base64_pad) break; + ch = (int)strchr(base64_table, ch); + if (ch == 0) { + efree(result); + return NULL; + } + ch -= (int)base64_table; + + 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 0: + case 1: + efree(result); + return NULL; + case 2: + k++; + case 3: + result[k++] = 0; + } + } + if(ret_length) { + *ret_length = j; + } + result[k] = '\0'; + return result; +} + +/* {{{ proto string base64_encode(string str) + Encodes string using MIME base64 algorithm */ +void php3_base64_encode(INTERNAL_FUNCTION_PARAMETERS) { + pval *string; + unsigned char *result; + int ret_length; + TLS_VARS; + + if (ARG_COUNT(ht)!=1 || getParameters(ht,1,&string) == FAILURE) { + WRONG_PARAM_COUNT; + } + convert_to_string(string); + result = _php3_base64_encode(string->value.str.val, string->value.str.len, &ret_length); + if (result != NULL) { + return_value->value.str.val = result; + return_value->value.str.len = ret_length; + return_value->type = IS_STRING; + } else { + RETURN_FALSE; + } +} +/* }}} */ + + +/* {{{ proto string base64_decode(string str) + Decodes string using MIME base64 algorithm */ +void php3_base64_decode(INTERNAL_FUNCTION_PARAMETERS) { + pval *string; + unsigned char *result; + int ret_length; + TLS_VARS; + + if (ARG_COUNT(ht)!=1 || getParameters(ht,1,&string) == FAILURE) { + WRONG_PARAM_COUNT; + } + convert_to_string(string); + result = _php3_base64_decode(string->value.str.val, string->value.str.len, &ret_length); + if (result != NULL) { + return_value->value.str.val = result; + return_value->value.str.len = ret_length; + return_value->type = IS_STRING; + } else { + RETURN_FALSE; + } +} +/* }}} */ + + +/* + * Local variables: + * tab-width: 4 + * c-basic-offset: 4 + * End: + */ |