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LPC2368/lwip/include/ipv4/lwip/inet_chksum.h@0:479ce5546098, 2011-12-31 (annotated)

Committer:
sherckuith
Date:
Sat Dec 31 11:25:27 2011 +0000
Revision:
0:479ce5546098
Ethernet

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sherckuith 0:479ce5546098 1 /*
sherckuith 0:479ce5546098 2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
sherckuith 0:479ce5546098 3 * All rights reserved.
sherckuith 0:479ce5546098 4 *
sherckuith 0:479ce5546098 5 * Redistribution and use in source and binary forms, with or without modification,
sherckuith 0:479ce5546098 6 * are permitted provided that the following conditions are met:
sherckuith 0:479ce5546098 7 *
sherckuith 0:479ce5546098 8 * 1. Redistributions of source code must retain the above copyright notice,
sherckuith 0:479ce5546098 9 * this list of conditions and the following disclaimer.
sherckuith 0:479ce5546098 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
sherckuith 0:479ce5546098 11 * this list of conditions and the following disclaimer in the documentation
sherckuith 0:479ce5546098 12 * and/or other materials provided with the distribution.
sherckuith 0:479ce5546098 13 * 3. The name of the author may not be used to endorse or promote products
sherckuith 0:479ce5546098 14 * derived from this software without specific prior written permission.
sherckuith 0:479ce5546098 15 *
sherckuith 0:479ce5546098 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
sherckuith 0:479ce5546098 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
sherckuith 0:479ce5546098 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
sherckuith 0:479ce5546098 19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
sherckuith 0:479ce5546098 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
sherckuith 0:479ce5546098 21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
sherckuith 0:479ce5546098 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
sherckuith 0:479ce5546098 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sherckuith 0:479ce5546098 24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
sherckuith 0:479ce5546098 25 * OF SUCH DAMAGE.
sherckuith 0:479ce5546098 26 *
sherckuith 0:479ce5546098 27 * This file is part of the lwIP TCP/IP stack.
sherckuith 0:479ce5546098 28 *
sherckuith 0:479ce5546098 29 * Author: Adam Dunkels <adam@sics.se>
sherckuith 0:479ce5546098 30 *
sherckuith 0:479ce5546098 31 */
sherckuith 0:479ce5546098 32 #ifndef __LWIP_INET_CHKSUM_H__
sherckuith 0:479ce5546098 33 #define __LWIP_INET_CHKSUM_H__
sherckuith 0:479ce5546098 34
sherckuith 0:479ce5546098 35 #include "lwip/opt.h"
sherckuith 0:479ce5546098 36
sherckuith 0:479ce5546098 37 #include "lwip/pbuf.h"
sherckuith 0:479ce5546098 38 #include "lwip/ip_addr.h"
sherckuith 0:479ce5546098 39
sherckuith 0:479ce5546098 40 /** Swap the bytes in an u16_t: much like htons() for little-endian */
sherckuith 0:479ce5546098 41 #ifndef SWAP_BYTES_IN_WORD
sherckuith 0:479ce5546098 42 #if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)
sherckuith 0:479ce5546098 43 /* little endian and PLATFORM_BYTESWAP defined */
sherckuith 0:479ce5546098 44 #define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w)
sherckuith 0:479ce5546098 45 #else /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) */
sherckuith 0:479ce5546098 46 /* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */
sherckuith 0:479ce5546098 47 #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
sherckuith 0:479ce5546098 48 #endif /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)*/
sherckuith 0:479ce5546098 49 #endif /* SWAP_BYTES_IN_WORD */
sherckuith 0:479ce5546098 50
sherckuith 0:479ce5546098 51 /** Split an u32_t in two u16_ts and add them up */
sherckuith 0:479ce5546098 52 #ifndef FOLD_U32T
sherckuith 0:479ce5546098 53 #define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL))
sherckuith 0:479ce5546098 54 #endif
sherckuith 0:479ce5546098 55
sherckuith 0:479ce5546098 56 #if LWIP_CHECKSUM_ON_COPY
sherckuith 0:479ce5546098 57 /** Function-like macro: same as MEMCPY but returns the checksum of copied data
sherckuith 0:479ce5546098 58 as u16_t */
sherckuith 0:479ce5546098 59 #ifndef LWIP_CHKSUM_COPY
sherckuith 0:479ce5546098 60 #define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
sherckuith 0:479ce5546098 61 #ifndef LWIP_CHKSUM_COPY_ALGORITHM
sherckuith 0:479ce5546098 62 #define LWIP_CHKSUM_COPY_ALGORITHM 1
sherckuith 0:479ce5546098 63 #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
sherckuith 0:479ce5546098 64 #endif /* LWIP_CHKSUM_COPY */
sherckuith 0:479ce5546098 65 #else /* LWIP_CHECKSUM_ON_COPY */
sherckuith 0:479ce5546098 66 #define LWIP_CHKSUM_COPY_ALGORITHM 0
sherckuith 0:479ce5546098 67 #endif /* LWIP_CHECKSUM_ON_COPY */
sherckuith 0:479ce5546098 68
sherckuith 0:479ce5546098 69 #ifdef __cplusplus
sherckuith 0:479ce5546098 70 extern "C" {
sherckuith 0:479ce5546098 71 #endif
sherckuith 0:479ce5546098 72
sherckuith 0:479ce5546098 73 u16_t inet_chksum(void *dataptr, u16_t len);
sherckuith 0:479ce5546098 74 u16_t inet_chksum_pbuf(struct pbuf *p);
sherckuith 0:479ce5546098 75 u16_t inet_chksum_pseudo(struct pbuf *p,
sherckuith 0:479ce5546098 76 ip_addr_t *src, ip_addr_t *dest,
sherckuith 0:479ce5546098 77 u8_t proto, u16_t proto_len);
sherckuith 0:479ce5546098 78 u16_t inet_chksum_pseudo_partial(struct pbuf *p,
sherckuith 0:479ce5546098 79 ip_addr_t *src, ip_addr_t *dest,
sherckuith 0:479ce5546098 80 u8_t proto, u16_t proto_len, u16_t chksum_len);
sherckuith 0:479ce5546098 81 #if LWIP_CHKSUM_COPY_ALGORITHM
sherckuith 0:479ce5546098 82 u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);
sherckuith 0:479ce5546098 83 #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
sherckuith 0:479ce5546098 84
sherckuith 0:479ce5546098 85 #ifdef __cplusplus
sherckuith 0:479ce5546098 86 }
sherckuith 0:479ce5546098 87 #endif
sherckuith 0:479ce5546098 88
sherckuith 0:479ce5546098 89 #endif /* __LWIP_INET_H__ */
sherckuith 0:479ce5546098 90