197 lines
4.9 KiB
C
197 lines
4.9 KiB
C
/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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copyfile.c
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Abstract:
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InternalCopyFile - Copies a file retaining time and attributes
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Author:
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Matthew A Felton
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Revision History:
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Matthew Felton (mattfe) 27 March 1995
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--*/
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#include <precomp.h>
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#define FILE_SHARE_EXCLUSIVE 0
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#define BUFFER_SIZE 4096
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BOOL
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InternalCopyFile(
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HANDLE hSourceFile,
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PWIN32_FIND_DATA pSourceFileData,
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LPWSTR lpNewFileName,
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BOOL bFailIfExists
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)
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/*++
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Routine Description:
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Arguments:
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hSourceFile - SourceFile Handle
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pSourceFileData - Pointer to WIN32_FIND_DATA for the source file
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lpNewFileName - Supplies the name where a copy of the existing
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files data and attributes are to be stored.
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bFailIfExists - Supplies a flag that indicates how this operation is
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to proceed if the specified new file already exists. A value of
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TRUE specifies that this call is to fail. A value of FALSE
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causes the call to the function to succeed whether or not the
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specified new file exists.
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Return Value:
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TRUE - The operation was successful.
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FALSE/NULL - The operation failed. Extended error status is available
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using GetLastError.
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--*/
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{
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DWORD dwSourceFileAttributes;
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BOOL bReturnValue = FALSE;
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HANDLE hTargetFile = INVALID_HANDLE_VALUE;
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DWORD dwLowFileSize, dwHighFileSize;
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LPVOID pBuffer;
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DWORD cbBufferSize = BUFFER_SIZE;
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DWORD cbBytesRead;
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DWORD cbBytesWritten;
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DWORD dwSourceFilePointer;
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SPLASSERT( hSourceFile != NULL &&
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hSourceFile != INVALID_HANDLE_VALUE &&
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pSourceFileData != NULL &&
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lpNewFileName != NULL );
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#if DBG
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// <<<<< DEBUG ONLY >>>>>>
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//
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// ASSERTION Check Source File Pointer is Zero.
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//
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dwSourceFilePointer = SetFilePointer( hSourceFile, 0, NULL, FILE_CURRENT );
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if ( dwSourceFilePointer != 0xffffffff ) {
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SPLASSERT( dwSourceFilePointer == 0 );
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}
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#endif // DBG
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//
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// Alloc I/O Buffer
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//
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pBuffer = AllocSplMem( BUFFER_SIZE );
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if ( pBuffer == NULL )
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goto InternalCopyFileExit;
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//
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// Create TagetFile with same File Attributes
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//
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hTargetFile = CreateFile( lpNewFileName,
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GENERIC_WRITE,
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FILE_SHARE_EXCLUSIVE,
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NULL,
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bFailIfExists ? CREATE_NEW : CREATE_ALWAYS,
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pSourceFileData->dwFileAttributes | FILE_FLAG_SEQUENTIAL_SCAN,
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NULL );
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if ( hTargetFile != INVALID_HANDLE_VALUE ) {
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//
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// Copy The Data
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//
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while (( bReturnValue = ReadFile( hSourceFile, pBuffer, cbBufferSize, &cbBytesRead, NULL )) &&
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cbBytesRead != 0 ) {
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//
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// Add Code to Build CheckSum Here
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//
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bReturnValue = WriteFile( hTargetFile, pBuffer, cbBytesRead, &cbBytesWritten, NULL );
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if ( bReturnValue == FALSE ||
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cbBytesWritten != cbBytesRead ) {
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bReturnValue = FALSE;
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break;
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}
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}
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if ( bReturnValue ) {
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//
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// Set TargetFile Times to be the same as the Source File
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//
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bReturnValue = SetFileTime( hTargetFile,
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&pSourceFileData->ftCreationTime,
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&pSourceFileData->ftLastAccessTime,
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&pSourceFileData->ftLastWriteTime );
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//
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// Verify that the file size is correct.
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//
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if ( bReturnValue ) {
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dwLowFileSize = GetFileSize( hTargetFile, &dwHighFileSize );
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if ( dwLowFileSize != pSourceFileData->nFileSizeLow ||
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dwHighFileSize != pSourceFileData->nFileSizeHigh ) {
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DBGMSG(DBG_ERROR,
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("InternalCopyFile: sizes do not match for %ws: (%d %d) and (%d %d)",
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lpNewFileName,
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pSourceFileData->nFileSizeHigh,
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pSourceFileData->nFileSizeLow,
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dwHighFileSize,
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dwLowFileSize));
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bReturnValue = FALSE;
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SetLastError(ERROR_FILE_INVALID);
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}
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}
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//
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// Add Code here to Verify the CheckSum is correct.
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//
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}
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CloseHandle( hTargetFile );
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}
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FreeSplMem( pBuffer );
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InternalCopyFileExit:
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if ( !bReturnValue ) {
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DBGMSG( DBG_WARN, ("InternalCopyFile hSourceFile %x %ws error %d\n", hSourceFile, lpNewFileName, GetLastError() ));
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SPLASSERT( GetLastError() != ERROR_SUCCESS );
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}
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return bReturnValue;
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}
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