epan/in_cksum.h

   1 /* in_cksum.h
   2  * Declaration of Internet checksum routine.
   3  *
   4  * Copyright (c) 1988, 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * SPDX-License-Identifier: BSD-3-Clause
   8  */
   9
  10 #ifndef __IN_CKSUM_H__
  11 #define __IN_CKSUM_H__
  12
  13 #include "ws_symbol_export.h"
  14
  15 typedef struct {
  16         const guint8 *ptr;
  17         int     len;
  18 } vec_t;
  19
  20 #define SET_CKSUM_VEC_PTR(vecelem, data, length) \
  21         G_STMT_START { \
  22                 vecelem.ptr = (data); \
  23                 vecelem.len = (length); \
  24         } G_STMT_END
  25
  26 #define SET_CKSUM_VEC_TVB(vecelem, tvb, offset, length) \
  27         G_STMT_START { \
  28                 vecelem.len = (length); \
  29                 vecelem.ptr = tvb_get_ptr((tvb), (offset), vecelem.len); \
  30         } G_STMT_END
  31
  32 WS_DLL_PUBLIC guint16 ip_checksum(const guint8 *ptr, int len);
  33
  34 WS_DLL_PUBLIC guint16 ip_checksum_tvb(tvbuff_t *tvb, int offset, int len);
  35
  36 WS_DLL_PUBLIC int in_cksum(const vec_t *vec, int veclen);
  37
  38 guint16 in_cksum_shouldbe(guint16 sum, guint16 computed_sum);
  39
  40 #endif /* __IN_CKSUM_H__ */