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/* +----------------------------------------------------------------------+ | PHP Version 5 | +----------------------------------------------------------------------+ | Copyright (c) 1997-2016 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. | +----------------------------------------------------------------------+ | 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_API void PHP_CRC32BFinal(unsigned char digest[4], PHP_CRC32_CTX *context) { context->state=~context->state; digest[0] = (unsigned char) ((context->state >> 24) & 0xff); digest[1] = (unsigned char) ((context->state >> 16) & 0xff); digest[2] = (unsigned char) ((context->state >> 8) & 0xff); digest[3] = (unsigned char) (context->state & 0xff); context->state = 0; } PHP_HASH_API int PHP_CRC32Copy(const php_hash_ops *ops, PHP_CRC32_CTX *orig_context, PHP_CRC32_CTX *copy_context) { copy_context->state = orig_context->state; return SUCCESS; } const 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, (php_hash_copy_func_t) PHP_CRC32Copy, 4, /* what to say here? */ 4, sizeof(PHP_CRC32_CTX) }; const 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_CRC32BFinal, (php_hash_copy_func_t) PHP_CRC32Copy, 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 */