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Diffstat (limited to 'fluent-bit/lib/librdkafka-2.1.0/src/rdcrc32.h')
| -rw-r--r-- | fluent-bit/lib/librdkafka-2.1.0/src/rdcrc32.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/fluent-bit/lib/librdkafka-2.1.0/src/rdcrc32.h b/fluent-bit/lib/librdkafka-2.1.0/src/rdcrc32.h new file mode 100644 index 000000000..c3195fca6 --- /dev/null +++ b/fluent-bit/lib/librdkafka-2.1.0/src/rdcrc32.h @@ -0,0 +1,170 @@ +/* + * 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__ */ |