Dateiliste

A function to compress a file by utilising NTFS's compression feature.

Open CompressNTFS.c
 

CompressNTFS.c:

 
#include <windows.h>
 
BOOL CompressFileNTFSEx (const TCHAR *tcFileName, USHORT usState)
{  // Compress or uncompress the given file.
  //
  //  usState can be:
  //  0 = COMPRESSION_FORMAT_NONE
  //  1 = COMPRESSION_FORMAT_DEFAULT
  //  2 = COMPRESSION_FORMAT_LZNT1
  //
  //  Returns TRUE if successful, FALSE if an error occurred.
  //
 
  HANDLE    hFile;
  DWORD    dwBytesReturned;
  BOOL    bResult;
 
  //return FALSE;
 
  hFile = CreateFile (tcFileName,
          GENERIC_READ | GENERIC_WRITE,
          FILE_SHARE_DELETE + FILE_SHARE_READ + FILE_SHARE_WRITE,
          NULL,
          OPEN_EXISTING,
          FILE_ATTRIBUTE_NORMAL + FILE_FLAG_SEQUENTIAL_SCAN,
          NULL);
  if (hFile == INVALID_HANDLE_VALUE)
    return FALSE;
  bResult = DeviceIoControl (hFile,      // Handle to file or directory
            FSCTL_SET_COMPRESSION,  // dwIoControlCode
            &usState,        // Input buffer
            sizeof (USHORT),    // Size of input buffer
            NULL,          // lpOutBuffer
            0,            // nOutBufferSize
            &dwBytesReturned,    // Number of bytes returned
            NULL          // OVERLAPPED structure
            );
  if (!CloseHandle (hFile))
    return FALSE;
  return (bResult);
}
 
BOOL CompressFileNTFS (const TCHAR *tcFileName)
{
  return (CompressFileNTFSEx (tcFileName, COMPRESSION_FORMAT_DEFAULT));
}
 
BOOL UnCompressFileNTFS (const TCHAR *tcFileName)
{
  return (CompressFileNTFSEx (tcFileName, COMPRESSION_FORMAT_NONE));
}
 

Open CompressNTFS.h
 

CompressNTFS.h:

 
#ifndef __Compress_NTFS_included
#define __Compress_NTFS_included
 
BOOL CompressFileNTFSEx (const TCHAR *tcFileName, USHORT usState);
BOOL CompressFileNTFS (const TCHAR *tcFileName);
BOOL UnCompressFileNTFS (const TCHAR *tcFileName);
 
#endif