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Dependencies:   mbed

NetServices/lwip/include/ipv4/lwip/inet_chksum.h@1:f5ac63519541, 2014-03-05 (annotated)

Committer:
Michael J. Spencer
Date:
Wed Mar 05 06:14:02 2014 -0800
Revision:
1:f5ac63519541
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Michael J. Spencer 1:f5ac63519541 1 /*
Michael J. Spencer 1:f5ac63519541 2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
Michael J. Spencer 1:f5ac63519541 3 * All rights reserved.
Michael J. Spencer 1:f5ac63519541 4 *
Michael J. Spencer 1:f5ac63519541 5 * Redistribution and use in source and binary forms, with or without modification,
Michael J. Spencer 1:f5ac63519541 6 * are permitted provided that the following conditions are met:
Michael J. Spencer 1:f5ac63519541 7 *
Michael J. Spencer 1:f5ac63519541 8 * 1. Redistributions of source code must retain the above copyright notice,
Michael J. Spencer 1:f5ac63519541 9 * this list of conditions and the following disclaimer.
Michael J. Spencer 1:f5ac63519541 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
Michael J. Spencer 1:f5ac63519541 11 * this list of conditions and the following disclaimer in the documentation
Michael J. Spencer 1:f5ac63519541 12 * and/or other materials provided with the distribution.
Michael J. Spencer 1:f5ac63519541 13 * 3. The name of the author may not be used to endorse or promote products
Michael J. Spencer 1:f5ac63519541 14 * derived from this software without specific prior written permission.
Michael J. Spencer 1:f5ac63519541 15 *
Michael J. Spencer 1:f5ac63519541 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
Michael J. Spencer 1:f5ac63519541 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
Michael J. Spencer 1:f5ac63519541 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
Michael J. Spencer 1:f5ac63519541 19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Michael J. Spencer 1:f5ac63519541 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
Michael J. Spencer 1:f5ac63519541 21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Michael J. Spencer 1:f5ac63519541 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Michael J. Spencer 1:f5ac63519541 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
Michael J. Spencer 1:f5ac63519541 24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
Michael J. Spencer 1:f5ac63519541 25 * OF SUCH DAMAGE.
Michael J. Spencer 1:f5ac63519541 26 *
Michael J. Spencer 1:f5ac63519541 27 * This file is part of the lwIP TCP/IP stack.
Michael J. Spencer 1:f5ac63519541 28 *
Michael J. Spencer 1:f5ac63519541 29 * Author: Adam Dunkels <adam@sics.se>
Michael J. Spencer 1:f5ac63519541 30 *
Michael J. Spencer 1:f5ac63519541 31 */
Michael J. Spencer 1:f5ac63519541 32 #ifndef __LWIP_INET_CHKSUM_H__
Michael J. Spencer 1:f5ac63519541 33 #define __LWIP_INET_CHKSUM_H__
Michael J. Spencer 1:f5ac63519541 34
Michael J. Spencer 1:f5ac63519541 35 #include "lwip/opt.h"
Michael J. Spencer 1:f5ac63519541 36
Michael J. Spencer 1:f5ac63519541 37 #include "lwip/pbuf.h"
Michael J. Spencer 1:f5ac63519541 38 #include "lwip/ip_addr.h"
Michael J. Spencer 1:f5ac63519541 39
Michael J. Spencer 1:f5ac63519541 40 /** Swap the bytes in an u16_t: much like htons() for little-endian */
Michael J. Spencer 1:f5ac63519541 41 #ifndef SWAP_BYTES_IN_WORD
Michael J. Spencer 1:f5ac63519541 42 #if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)
Michael J. Spencer 1:f5ac63519541 43 /* little endian and PLATFORM_BYTESWAP defined */
Michael J. Spencer 1:f5ac63519541 44 #define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w)
Michael J. Spencer 1:f5ac63519541 45 #else /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) */
Michael J. Spencer 1:f5ac63519541 46 /* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */
Michael J. Spencer 1:f5ac63519541 47 #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
Michael J. Spencer 1:f5ac63519541 48 #endif /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)*/
Michael J. Spencer 1:f5ac63519541 49 #endif /* SWAP_BYTES_IN_WORD */
Michael J. Spencer 1:f5ac63519541 50
Michael J. Spencer 1:f5ac63519541 51 /** Split an u32_t in two u16_ts and add them up */
Michael J. Spencer 1:f5ac63519541 52 #ifndef FOLD_U32T
Michael J. Spencer 1:f5ac63519541 53 #define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL))
Michael J. Spencer 1:f5ac63519541 54 #endif
Michael J. Spencer 1:f5ac63519541 55
Michael J. Spencer 1:f5ac63519541 56 #if LWIP_CHECKSUM_ON_COPY
Michael J. Spencer 1:f5ac63519541 57 /** Function-like macro: same as MEMCPY but returns the checksum of copied data
Michael J. Spencer 1:f5ac63519541 58 as u16_t */
Michael J. Spencer 1:f5ac63519541 59 #ifndef LWIP_CHKSUM_COPY
Michael J. Spencer 1:f5ac63519541 60 #define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
Michael J. Spencer 1:f5ac63519541 61 #ifndef LWIP_CHKSUM_COPY_ALGORITHM
Michael J. Spencer 1:f5ac63519541 62 #define LWIP_CHKSUM_COPY_ALGORITHM 1
Michael J. Spencer 1:f5ac63519541 63 #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
Michael J. Spencer 1:f5ac63519541 64 #endif /* LWIP_CHKSUM_COPY */
Michael J. Spencer 1:f5ac63519541 65 #else /* LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 66 #define LWIP_CHKSUM_COPY_ALGORITHM 0
Michael J. Spencer 1:f5ac63519541 67 #endif /* LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 68
Michael J. Spencer 1:f5ac63519541 69 #ifdef __cplusplus
Michael J. Spencer 1:f5ac63519541 70 extern "C" {
Michael J. Spencer 1:f5ac63519541 71 #endif
Michael J. Spencer 1:f5ac63519541 72
Michael J. Spencer 1:f5ac63519541 73 u16_t inet_chksum(void *dataptr, u16_t len);
Michael J. Spencer 1:f5ac63519541 74 u16_t inet_chksum_pbuf(struct pbuf *p);
Michael J. Spencer 1:f5ac63519541 75 u16_t inet_chksum_pseudo(struct pbuf *p,
Michael J. Spencer 1:f5ac63519541 76 ip_addr_t *src, ip_addr_t *dest,
Michael J. Spencer 1:f5ac63519541 77 u8_t proto, u16_t proto_len);
Michael J. Spencer 1:f5ac63519541 78 u16_t inet_chksum_pseudo_partial(struct pbuf *p,
Michael J. Spencer 1:f5ac63519541 79 ip_addr_t *src, ip_addr_t *dest,
Michael J. Spencer 1:f5ac63519541 80 u8_t proto, u16_t proto_len, u16_t chksum_len);
Michael J. Spencer 1:f5ac63519541 81 #if LWIP_CHKSUM_COPY_ALGORITHM
Michael J. Spencer 1:f5ac63519541 82 u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);
Michael J. Spencer 1:f5ac63519541 83 #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
Michael J. Spencer 1:f5ac63519541 84
Michael J. Spencer 1:f5ac63519541 85 #ifdef __cplusplus
Michael J. Spencer 1:f5ac63519541 86 }
Michael J. Spencer 1:f5ac63519541 87 #endif
Michael J. Spencer 1:f5ac63519541 88
Michael J. Spencer 1:f5ac63519541 89 #endif /* __LWIP_INET_H__ */
Michael J. Spencer 1:f5ac63519541 90