| /* |
| * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| * 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. |
| * 3. 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. |
| * |
| * This file is part of the lwIP TCP/IP stack. |
| * |
| * Author: Adam Dunkels <adam@sics.se> |
| * |
| */ |
| #ifndef __LWIP_INET_CHKSUM_H__ |
| #define __LWIP_INET_CHKSUM_H__ |
| |
| #include "lwip/opt.h" |
| |
| #include "lwip/pbuf.h" |
| #include "lwip/ip_addr.h" |
| |
| /** Swap the bytes in an u16_t: much like htons() for little-endian */ |
| #ifndef SWAP_BYTES_IN_WORD |
| #if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) |
| /* little endian and PLATFORM_BYTESWAP defined */ |
| #define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w) |
| #else /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) */ |
| /* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */ |
| #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8) |
| #endif /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)*/ |
| #endif /* SWAP_BYTES_IN_WORD */ |
| |
| /** Split an u32_t in two u16_ts and add them up */ |
| #ifndef FOLD_U32T |
| #define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL)) |
| #endif |
| |
| #if LWIP_CHECKSUM_ON_COPY |
| /** Function-like macro: same as MEMCPY but returns the checksum of copied data |
| as u16_t */ |
| #ifndef LWIP_CHKSUM_COPY |
| #define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len) |
| #ifndef LWIP_CHKSUM_COPY_ALGORITHM |
| #define LWIP_CHKSUM_COPY_ALGORITHM 1 |
| #endif /* LWIP_CHKSUM_COPY_ALGORITHM */ |
| #endif /* LWIP_CHKSUM_COPY */ |
| #else /* LWIP_CHECKSUM_ON_COPY */ |
| #define LWIP_CHKSUM_COPY_ALGORITHM 0 |
| #endif /* LWIP_CHECKSUM_ON_COPY */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| u16_t inet_chksum(void *dataptr, u16_t len); |
| u16_t inet_chksum_pbuf(struct pbuf *p); |
| u16_t inet_chksum_pseudo(struct pbuf *p, |
| ip_addr_t *src, ip_addr_t *dest, |
| u8_t proto, u16_t proto_len); |
| u16_t inet_chksum_pseudo_partial(struct pbuf *p, |
| ip_addr_t *src, ip_addr_t *dest, |
| u8_t proto, u16_t proto_len, u16_t chksum_len); |
| #if LWIP_CHKSUM_COPY_ALGORITHM |
| u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len); |
| #endif /* LWIP_CHKSUM_COPY_ALGORITHM */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* __LWIP_INET_H__ */ |
| |
