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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2018 Magnus Edenhill
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file rdcrc32.h
* Functions and types for CRC checks.
*
* Generated on Tue May 8 17:36:59 2012,
* by pycrc v0.7.10, http://www.tty1.net/pycrc/
*
* NOTE: Contains librd modifications:
* - rd_crc32() helper.
* - __RDCRC32___H__ define (was missing the '32' part).
*
* using the configuration:
* Width = 32
* Poly = 0x04c11db7
* XorIn = 0xffffffff
* ReflectIn = True
* XorOut = 0xffffffff
* ReflectOut = True
* Algorithm = table-driven
*****************************************************************************/
#ifndef __RDCRC32___H__
#define __RDCRC32___H__
#include "rd.h"
#include <stdlib.h>
#include <stdint.h>
#if WITH_ZLIB
#include <zlib.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/**
* The definition of the used algorithm.
*****************************************************************************/
#define CRC_ALGO_TABLE_DRIVEN 1
/**
* The type of the CRC values.
*
* This type must be big enough to contain at least 32 bits.
*****************************************************************************/
typedef uint32_t rd_crc32_t;
#if !WITH_ZLIB
extern const rd_crc32_t crc_table[256];
#endif
/**
* Reflect all bits of a \a data word of \a data_len bytes.
*
* \param data The data word to be reflected.
* \param data_len The width of \a data expressed in number of bits.
* \return The reflected data.
*****************************************************************************/
rd_crc32_t rd_crc32_reflect(rd_crc32_t data, size_t data_len);
/**
* Calculate the initial crc value.
*
* \return The initial crc value.
*****************************************************************************/
static RD_INLINE rd_crc32_t rd_crc32_init(void) {
#if WITH_ZLIB
return crc32(0, NULL, 0);
#else
return 0xffffffff;
#endif
}
/**
* Update the crc value with new data.
*
* \param crc The current crc value.
* \param data Pointer to a buffer of \a data_len bytes.
* \param data_len Number of bytes in the \a data buffer.
* \return The updated crc value.
*****************************************************************************/
/**
* Update the crc value with new data.
*
* \param crc The current crc value.
* \param data Pointer to a buffer of \a data_len bytes.
* \param data_len Number of bytes in the \a data buffer.
* \return The updated crc value.
*****************************************************************************/
static RD_INLINE RD_UNUSED rd_crc32_t rd_crc32_update(rd_crc32_t crc,
const unsigned char *data,
size_t data_len) {
#if WITH_ZLIB
rd_assert(data_len <= UINT_MAX);
return crc32(crc, data, (uInt)data_len);
#else
unsigned int tbl_idx;
while (data_len--) {
tbl_idx = (crc ^ *data) & 0xff;
crc = (crc_table[tbl_idx] ^ (crc >> 8)) & 0xffffffff;
data++;
}
return crc & 0xffffffff;
#endif
}
/**
* Calculate the final crc value.
*
* \param crc The current crc value.
* \return The final crc value.
*****************************************************************************/
static RD_INLINE rd_crc32_t rd_crc32_finalize(rd_crc32_t crc) {
#if WITH_ZLIB
return crc;
#else
return crc ^ 0xffffffff;
#endif
}
/**
* Wrapper for performing CRC32 on the provided buffer.
*/
static RD_INLINE rd_crc32_t rd_crc32(const char *data, size_t data_len) {
return rd_crc32_finalize(rd_crc32_update(
rd_crc32_init(), (const unsigned char *)data, data_len));
}
#ifdef __cplusplus
} /* closing brace for extern "C" */
#endif
#endif /* __RDCRC32___H__ */
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