ReactOS Development > Doxygen

00001 /*
00002  * COPYRIGHT:   See COPYING in the top level directory
00003  * PROJECT:     ReactOS TCP/IP protocol driver
00004  * FILE:        include/checksum.h
00005  * PURPOSE:     Checksum routine definitions
00006  */
00007 
00008 #pragma once
00009 
00010 
00011 ULONG ChecksumFold(
00012   ULONG Sum);
00013 
00014 ULONG ChecksumCompute(
00015     PVOID Data,
00016     UINT Count,
00017     ULONG Seed);
00018 
00019 unsigned int
00020 csum_partial(
00021   const unsigned char * buff,
00022   int len,
00023   unsigned int sum);
00024 
00025 ULONG
00026 UDPv4ChecksumCalculate(
00027   PIPv4_HEADER IPHeader,
00028   PUCHAR PacketBuffer,
00029   ULONG DataLength);
00030 
00031 #define IPv4Checksum(Data, Count, Seed)(~ChecksumFold(ChecksumCompute(Data, Count, Seed)))
00032 #define TCPv4Checksum(Data, Count, Seed)(~ChecksumFold(csum_partial(Data, Count, Seed)))
00033 //#define TCPv4Checksum(Data, Count, Seed)(~ChecksumFold(ChecksumCompute(Data, Count, Seed)))
00034 
00035 /*
00036  * Macro to check for a correct checksum
00037  * BOOLEAN IPv4CorrectChecksum(PVOID Data, UINT Count)
00038  */
00039 #define IPv4CorrectChecksum(Data, Count) \
00040     (BOOLEAN)(IPv4Checksum(Data, Count, 0) == DH2N(0x0000FFFF))
00041 
00042 /*
00043  * Macro to check for a correct checksum
00044  * BOOLEAN TCPv4CorrectChecksum(PTCPv4_PSEUDO_HEADER TcpPseudoHeader,
00045  *   PVOID Data, UINT Count)
00046  */
00047 #define TCPv4CorrectChecksum(TcpPseudoHeader, Data, Count) \
00048     (BOOLEAN)(TCPv4Checksum(Data, Count, \
00049       TCPv4Checksum(TcpPseudoHeader, sizeof(TCPv4_PSEUDO_HEADER), \
00050       0)) == DH2N(0x0000FFFF))
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