| 0,0 → 1,108 |
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| /* |
| * Copyright (c) 2009 Lukas Mejdrech |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - 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. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. |
| */ |
| |
| /** @addtogroup net |
| * @{ |
| */ |
| |
| /** @file |
| * General CRC and checksum computation. |
| */ |
| |
| #ifndef __NET_CHECKSUM_H__ |
| #define __NET_CHECKSUM_H__ |
| |
| #include <byteorder.h> |
| |
| #include <sys/types.h> |
| |
| /** Computes CRC32 value. |
| * @param seed Initial value. Often used as 0 or ~0. Input parameter. |
| * @param data Pointer to the beginning of data to process. Input parameter. |
| * @param length Length of the data in bits. Input parameter. |
| * @returns The computed CRC32 of the length bits of the data. |
| */ |
| #ifdef ARCH_IS_BIG_ENDIAN |
| #define compute_crc32( seed, data, length ) compute_crc32_be( seed, ( uint8_t * ) data, length ) |
| #else |
| #define compute_crc32( seed, data, length ) compute_crc32_le( seed, ( uint8_t * ) data, length ) |
| #endif |
| |
| /** Computes CRC32 value in the little-endian environment. |
| * @param seed Initial value. Often used as 0 or ~0. Input parameter. |
| * @param data Pointer to the beginning of data to process. Input parameter. |
| * @param length Length of the data in bits. Input parameter. |
| * @returns The computed CRC32 of the length bits of the data. |
| */ |
| uint32_t compute_crc32_le( uint32_t seed, uint8_t * data, size_t length ); |
| |
| /** Computes CRC32 value in the big-endian environment. |
| * @param seed Initial value. Often used as 0 or ~0. Input parameter. |
| * @param data Pointer to the beginning of data to process. Input parameter. |
| * @param length Length of the data in bits. Input parameter. |
| * @returns The computed CRC32 of the length bits of the data. |
| */ |
| uint32_t compute_crc32_be( uint32_t seed, uint8_t * data, size_t length ); |
| |
| /** Computes sum of the 2 byte fields. |
| * Padds one zero (0) byte if odd. |
| * @param seed Initial value. Often used as 0 or ~0. Input parameter. |
| * @param data Pointer to the beginning of data to process. Input parameter. |
| * @param length Length of the data in bytes. Input parameter. |
| * @returns The computed checksum of the length bytes of the data. |
| */ |
| uint32_t compute_checksum( uint32_t seed, uint8_t * data, size_t length ); |
| |
| /** Compacts the computed checksum to the 16 bit number adding the carries. |
| * @param sum Computed checksum. Input parameter. |
| * @returns Compacted computed checksum to the 16 bits. |
| */ |
| uint16_t compact_checksum( uint32_t sum ); |
| |
| /** Returns or flips the checksum if zero. |
| * @param checksum The computed checksum. Input parameter. |
| * @returns The internet protocol header checksum. |
| * @returns 0xFFFF if the computed checksum is zero. |
| */ |
| uint16_t flip_checksum( uint16_t checksum ); |
| |
| /** Computes the ip header checksum. |
| * To compute the checksum of a new packet, the checksum header field must be zero. |
| * To check the checksum of a received packet, the checksum may be left set. |
| * The zero (0) value will be returned in this case if valid. |
| * @param data The header data. Input parameter. |
| * @param length The header length in bytes. Input parameter. |
| * @returns The internet protocol header checksum. |
| * @returns 0xFFFF if the computed checksum is zero. |
| */ |
| uint16_t ip_checksum( uint8_t * data, size_t length ); |
| |
| #endif |
| |
| /** @} |
| */ |
| Property changes: |
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| Added: svn:eol-style |
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| +native |
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| \ No newline at end of property |
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