162 lines
3.1 KiB
C
162 lines
3.1 KiB
C
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/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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extract.c
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Abstract:
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This module contains the code to extract
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a file from a cab file.
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Author:
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Wesley Witt (wesw) 29-Sept-1998
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Revision History:
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--*/
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#include <ntcabp.h>
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#pragma hdrstop
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PCAB_DIR_ENTRY
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FindFileInCab(
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IN PCAB_INSTANCE_DATA CabInst,
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IN PCWSTR FileName
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)
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{
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PLIST_ENTRY Next;
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PCAB_DIR_ENTRY CabDir;
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BOOL Found = FALSE;
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Next = CabInst->CabDir.Flink;
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while ((ULONG_PTR)Next != (ULONG_PTR)&CabInst->CabDir) {
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CabDir = CONTAINING_RECORD( Next, CAB_DIR_ENTRY, Next );
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Next = CabDir->Next.Flink;
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if (_wcsicmp( CabDir->FileName, FileName ) == 0) {
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Found = TRUE;
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break;
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}
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}
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if (Found) {
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return CabDir;
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}
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return NULL;
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}
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BOOL
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NtCabExtractOneFile(
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IN PCAB_INSTANCE_DATA CabInst,
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IN PCWSTR FileName,
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IN PCWSTR OutputFileName
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)
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{
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HANDLE hFile;
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ULONG i;
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BOOL rVal;
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DWORD Bytes = 0;
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DWORD BytesRead;
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NTSTATUS Status;
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PCAB_DIR_ENTRY CabDir;
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WCHAR ShortFileName[32];
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//if (GetShortPathName( FileName, ShortFileName, sizeof(ShortFileName)/sizeof(WCHAR) ) == 0) {
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// return FALSE;
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//}
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wcscpy(ShortFileName,FileName);
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CabDir = FindFileInCab( CabInst, ShortFileName );
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if (CabDir == NULL) {
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return FALSE;
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}
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if (SetFilePointer( CabInst->hCab, CabDir->Offset, NULL, FILE_BEGIN ) == 0xffffffff) {
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return FALSE;
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}
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if (OutputFileName == NULL) {
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OutputFileName = ShortFileName;
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}
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hFile = CreateFile(
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OutputFileName,
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GENERIC_WRITE,
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0,
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NULL,
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CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL,
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NULL
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);
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if (hFile == INVALID_HANDLE_VALUE) {
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return FALSE;
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}
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for (i=0; i<CabDir->Segments; i++) {
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BytesRead = CabDir->Segment[i];
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rVal = ReadFile(
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CabInst->hCab,
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CabInst->CompressBuf,
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BytesRead,
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&BytesRead,
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NULL
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);
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if (!rVal) {
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CloseHandle( hFile );
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return FALSE;
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}
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Bytes += BytesRead;
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Status = RtlDecompressBuffer (
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COMPRESSION_FORMAT_LZNT1,
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CabInst->ReadBuf,
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CabInst->ReadBufSize,
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CabInst->CompressBuf,
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BytesRead,
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&BytesRead
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);
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if (Status != STATUS_SUCCESS) {
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CloseHandle( hFile );
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return FALSE;
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}
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rVal = WriteFile(
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hFile,
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CabInst->ReadBuf,
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BytesRead,
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&BytesRead,
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NULL
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);
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}
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SetFileTime(
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hFile,
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&CabDir->CreationTime,
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&CabDir->LastAccessTime,
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&CabDir->LastWriteTime
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);
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CloseHandle( hFile );
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if (CabDir->ChkSum != 0) {
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if (MapFileAndCheckSum( (PWSTR)OutputFileName, &i, &Bytes ) != CHECKSUM_SUCCESS) {
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Bytes = 0;
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}
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if (Bytes != CabDir->ChkSum) {
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DeleteFile( OutputFileName );
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SetLastError( ERROR_INVALID_DATA );
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return FALSE;
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}
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}
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return TRUE;
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}
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