399 lines
9 KiB
C
399 lines
9 KiB
C
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/*++
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Copyright (c) 1993 Microsoft Corporation
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Module Name:
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checksum.c
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Abstract:
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This module implements a function for computing the checksum of an
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image file. It will also compute the checksum of other files as well.
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Author:
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David N. Cutler (davec) 21-Mar-1993
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Revision History:
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--*/
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#include <nt.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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#include <private.h>
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//
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// Define checksum routine prototype.
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//
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#ifdef __cplusplus
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extern "C"
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#endif
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USHORT
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ChkSum(
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DWORD PartialSum,
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PUSHORT Source,
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DWORD Length
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);
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PIMAGE_NT_HEADERS
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CheckSumMappedFile (
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LPVOID BaseAddress,
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DWORD FileLength,
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LPDWORD HeaderSum,
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LPDWORD CheckSum
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)
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/*++
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Routine Description:
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This functions computes the checksum of a mapped file.
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Arguments:
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BaseAddress - Supplies a pointer to the base of the mapped file.
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FileLength - Supplies the length of the file in bytes.
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HeaderSum - Suppllies a pointer to a variable that receives the checksum
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from the image file, or zero if the file is not an image file.
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CheckSum - Supplies a pointer to the variable that receive the computed
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checksum.
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Return Value:
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None.
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--*/
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{
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PUSHORT AdjustSum;
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PIMAGE_NT_HEADERS NtHeaders;
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USHORT PartialSum;
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PBYTE pbyte;
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//
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// Compute the checksum of the file and zero the header checksum value.
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//
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*HeaderSum = 0;
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PartialSum = ChkSum(0, (PUSHORT)BaseAddress, FileLength >> 1);
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//
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// If the file is an image file, then subtract the two checksum words
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// in the optional header from the computed checksum before adding
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// the file length, and set the value of the header checksum.
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//
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__try {
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NtHeaders = RtlpImageNtHeader(BaseAddress);
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} __except(EXCEPTION_EXECUTE_HANDLER) {
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NtHeaders = NULL;
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}
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if ((NtHeaders != NULL) && (NtHeaders != BaseAddress)) {
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if (NtHeaders->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
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*HeaderSum = ((PIMAGE_NT_HEADERS32)NtHeaders)->OptionalHeader.CheckSum;
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AdjustSum = (PUSHORT)(&((PIMAGE_NT_HEADERS32)NtHeaders)->OptionalHeader.CheckSum);
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} else
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if (NtHeaders->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
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*HeaderSum = ((PIMAGE_NT_HEADERS64)NtHeaders)->OptionalHeader.CheckSum;
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AdjustSum = (PUSHORT)(&((PIMAGE_NT_HEADERS64)NtHeaders)->OptionalHeader.CheckSum);
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} else {
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return(NULL);
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}
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PartialSum -= (PartialSum < AdjustSum[0]);
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PartialSum -= AdjustSum[0];
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PartialSum -= (PartialSum < AdjustSum[1]);
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PartialSum -= AdjustSum[1];
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}
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// add the last byte, if needed
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if (FileLength % 2) {
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pbyte = (PBYTE)BaseAddress + FileLength - 1;
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PartialSum += *pbyte;
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PartialSum = (PartialSum >> 16) + (PartialSum & 0xFFFF);
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}
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//
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// Compute the final checksum value as the sum of the paritial checksum
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// and the file length.
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//
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*CheckSum = (DWORD)PartialSum + FileLength;
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return NtHeaders;
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}
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DWORD
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MapFileAndCheckSumW(
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PWSTR Filename,
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LPDWORD HeaderSum,
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LPDWORD CheckSum
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)
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/*++
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Routine Description:
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This functions maps the specified file and computes the checksum of
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the file.
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Arguments:
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Filename - Supplies a pointer to the name of the file whose checksum
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is computed.
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HeaderSum - Supplies a pointer to a variable that receives the checksum
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from the image file, or zero if the file is not an image file.
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CheckSum - Supplies a pointer to the variable that receive the computed
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checksum.
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Return Value:
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0 if successful, else error number.
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--*/
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{
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#ifndef UNICODE_RULES
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CHAR FileNameA[ MAX_PATH ];
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// Convert the file name to Ansi and call the Ansi version
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// of this function.
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if (WideCharToMultiByte(
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CP_ACP,
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0,
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Filename,
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-1,
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FileNameA,
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MAX_PATH,
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NULL,
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NULL ) ) {
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return MapFileAndCheckSumA(FileNameA, HeaderSum, CheckSum);
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}
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return CHECKSUM_UNICODE_FAILURE;
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#else // UNICODE_RULES
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HANDLE FileHandle, MappingHandle;
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LPVOID BaseAddress;
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DWORD FileLength;
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//
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// Open the file for read access
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//
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FileHandle = CreateFileW(
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Filename,
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GENERIC_READ,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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NULL );
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if (FileHandle == INVALID_HANDLE_VALUE) {
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return CHECKSUM_OPEN_FAILURE;
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}
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//
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// Create a file mapping, map a view of the file into memory,
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// and close the file mapping handle.
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//
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MappingHandle = CreateFileMapping(FileHandle,
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NULL,
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PAGE_READONLY,
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0,
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0,
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NULL);
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if (!MappingHandle) {
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CloseHandle( FileHandle );
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return CHECKSUM_MAP_FAILURE;
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}
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//
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// Map a view of the file
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//
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BaseAddress = MapViewOfFile(MappingHandle, FILE_MAP_READ, 0, 0, 0);
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CloseHandle(MappingHandle);
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if (BaseAddress == NULL) {
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CloseHandle( FileHandle );
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return CHECKSUM_MAPVIEW_FAILURE;
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}
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//
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// Get the length of the file in bytes and compute the checksum.
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//
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FileLength = GetFileSize( FileHandle, NULL );
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CheckSumMappedFile(BaseAddress, FileLength, HeaderSum, CheckSum);
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//
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// Unmap the view of the file and close file handle.
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//
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UnmapViewOfFile(BaseAddress);
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CloseHandle( FileHandle );
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return CHECKSUM_SUCCESS;
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#endif // UNICODE_RULES
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}
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ULONG
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MapFileAndCheckSumA (
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LPSTR Filename,
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LPDWORD HeaderSum,
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LPDWORD CheckSum
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)
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/*++
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Routine Description:
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This functions maps the specified file and computes the checksum of
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the file.
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Arguments:
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Filename - Supplies a pointer to the name of the file whose checksum
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is computed.
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HeaderSum - Supplies a pointer to a variable that receives the checksum
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from the image file, or zero if the file is not an image file.
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CheckSum - Supplies a pointer to the variable that receive the computed
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checksum.
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Return Value:
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0 if successful, else error number.
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--*/
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{
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#ifdef UNICODE_RULES
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WCHAR FileNameW[ MAX_PATH ];
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//
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// Convert the file name to unicode and call the unicode version
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// of this function.
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//
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if (MultiByteToWideChar(
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CP_ACP,
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MB_PRECOMPOSED,
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Filename,
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-1,
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FileNameW,
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MAX_PATH ) ) {
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return MapFileAndCheckSumW(FileNameW, HeaderSum, CheckSum);
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}
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return CHECKSUM_UNICODE_FAILURE;
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#else // UNICODE_RULES
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HANDLE FileHandle, MappingHandle;
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LPVOID BaseAddress;
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DWORD FileLength;
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//
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// Open the file for read access
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//
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FileHandle = CreateFileA(
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Filename,
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GENERIC_READ,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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NULL );
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if (FileHandle == INVALID_HANDLE_VALUE) {
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return CHECKSUM_OPEN_FAILURE;
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}
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//
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// Create a file mapping, map a view of the file into memory,
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// and close the file mapping handle.
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//
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MappingHandle = CreateFileMapping(FileHandle,
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NULL,
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PAGE_READONLY,
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0,
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0,
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NULL);
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if (!MappingHandle) {
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CloseHandle( FileHandle );
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return CHECKSUM_MAP_FAILURE;
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}
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//
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// Map a view of the file
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//
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BaseAddress = MapViewOfFile(MappingHandle, FILE_MAP_READ, 0, 0, 0);
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CloseHandle(MappingHandle);
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if (BaseAddress == NULL) {
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CloseHandle( FileHandle );
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return CHECKSUM_MAPVIEW_FAILURE;
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}
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//
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// Get the length of the file in bytes and compute the checksum.
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//
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FileLength = GetFileSize( FileHandle, NULL );
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CheckSumMappedFile(BaseAddress, FileLength, HeaderSum, CheckSum);
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//
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// Unmap the view of the file and close file handle.
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//
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UnmapViewOfFile(BaseAddress);
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CloseHandle( FileHandle );
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return CHECKSUM_SUCCESS;
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#endif // UNICODE_RULES
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}
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BOOL
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TouchFileTimes(
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HANDLE FileHandle,
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LPSYSTEMTIME lpSystemTime
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)
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{
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SYSTEMTIME SystemTime;
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FILETIME SystemFileTime;
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if (lpSystemTime == NULL) {
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lpSystemTime = &SystemTime;
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GetSystemTime( lpSystemTime );
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}
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if (SystemTimeToFileTime( lpSystemTime, &SystemFileTime )) {
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return SetFileTime( FileHandle, NULL, NULL, &SystemFileTime );
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}
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else {
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return FALSE;
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}
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}
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