diff options
Diffstat (limited to 'ext/hash/hash_crc32.c')
| -rw-r--r-- | ext/hash/hash_crc32.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/ext/hash/hash_crc32.c b/ext/hash/hash_crc32.c new file mode 100644 index 0000000000..1fa1e2c5c5 --- /dev/null +++ b/ext/hash/hash_crc32.c @@ -0,0 +1,84 @@ +/* + +----------------------------------------------------------------------+ + | PHP Version 5 | + +----------------------------------------------------------------------+ + | Copyright (c) 1997-2005 The PHP Group | + +----------------------------------------------------------------------+ + | This source file is subject to version 3.0 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_0.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. | + +----------------------------------------------------------------------+ + | Authors: Michael Wallner <mike@php.net> | + | Sara Golemon <pollita@php.net> | + +----------------------------------------------------------------------+ +*/ + +/* $Id$ */ + +#include "php_hash.h" +#include "php_hash_crc32.h" +#include "php_hash_crc32_tables.h" + +PHP_HASH_API void PHP_CRC32Init(PHP_CRC32_CTX *context) +{ + context->state = ~0; +} + +PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len) +{ + size_t i; + + for (i = 0; i < len; ++i) { + context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)]; + } +} + +PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len) +{ + size_t i; + + for (i = 0; i < len; ++i) { + context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff]; + } +} + +PHP_HASH_API void PHP_CRC32Final(unsigned char digest[4], PHP_CRC32_CTX *context) +{ + context->state=~context->state; + digest[3] = (unsigned char) ((context->state >> 24) & 0xff); + digest[2] = (unsigned char) ((context->state >> 16) & 0xff); + digest[1] = (unsigned char) ((context->state >> 8) & 0xff); + digest[0] = (unsigned char) (context->state & 0xff); + context->state = 0; +} + +php_hash_ops php_hash_crc32_ops = { + (php_hash_init_func_t) PHP_CRC32Init, + (php_hash_update_func_t) PHP_CRC32Update, + (php_hash_final_func_t) PHP_CRC32Final, + 4, /* what to say here? */ + 4, + sizeof(PHP_CRC32_CTX) +}; + +php_hash_ops php_hash_crc32b_ops = { + (php_hash_init_func_t) PHP_CRC32Init, + (php_hash_update_func_t) PHP_CRC32BUpdate, + (php_hash_final_func_t) PHP_CRC32Final, + 4, /* what to say here? */ + 4, + sizeof(PHP_CRC32_CTX) +}; + +/* + * Local variables: + * tab-width: 4 + * c-basic-offset: 4 + * End: + * vim600: sw=4 ts=4 fdm=marker + * vim<600: sw=4 ts=4 + */ |