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Merge pull request #4076 from akallabeth/SetFilePointer_fix

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Set file pointer fix
This commit is contained in:
MartinHaimberger 2017-08-09 10:35:37 +02:00 committed by GitHub
commit 80ed23779f
2 changed files with 49 additions and 10 deletions
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12
channels/drive/client/drive_file.c
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@ -385,16 +385,13 @@ BOOL drive_file_free(DRIVE_FILE* file)
BOOL drive_file_seek(DRIVE_FILE* file, UINT64 Offset)
{
LONG lDistHigh;
DWORD dwPtrLow;
LARGE_INTEGER loffset;
if (!file)
return FALSE;
lDistHigh = Offset >> 32;
DEBUG_WSTR("Seek %s", file->fullpath);
dwPtrLow = SetFilePointer(file->file_handle, Offset & 0xFFFFFFFF, &lDistHigh, FILE_BEGIN);
return dwPtrLow != INVALID_SET_FILE_POINTER;
loffset.QuadPart = Offset;
return SetFilePointerEx(file->file_handle, loffset, NULL, FILE_BEGIN);
}
BOOL drive_file_read(DRIVE_FILE* file, BYTE* buffer, UINT32* Length)
@ -623,8 +620,7 @@ BOOL drive_file_set_information(DRIVE_FILE* file, UINT32 FsInformationClass, UIN
liSize.QuadPart = size & 0xFFFFFFFF;
if (SetFilePointer(file->file_handle, liSize.LowPart, &liSize.HighPart,
FILE_BEGIN) == INVALID_SET_FILE_POINTER)
if (!SetFilePointerEx(file->file_handle, liSize, NULL, FILE_BEGIN))
{
WLog_ERR(TAG, "Unable to truncate %s to %d (%"PRId32")", file->fullpath, size, GetLastError());
return FALSE;

47
winpr/libwinpr/file/file.c
View File

@ -122,12 +122,19 @@ static DWORD FileSetFilePointer(HANDLE hFile, LONG lDistanceToMove,
PLONG lpDistanceToMoveHigh, DWORD dwMoveMethod)
{
WINPR_FILE* pFile = (WINPR_FILE*) hFile;
long offset = lDistanceToMove;
INT64 offset;
int whence;
if (!hFile)
return INVALID_SET_FILE_POINTER;
if (lpDistanceToMoveHigh)
{
offset = (*lpDistanceToMoveHigh << 32) | (UINT32)lDistanceToMove;
}
else
offset = lDistanceToMove;
switch(dwMoveMethod)
{
case FILE_BEGIN:
@ -153,6 +160,42 @@ static DWORD FileSetFilePointer(HANDLE hFile, LONG lDistanceToMove,
return ftell(pFile->fp);
}
static BOOL FileSetFilePointerEx(HANDLE hFile, LARGE_INTEGER liDistanceToMove, PLARGE_INTEGER lpNewFilePointer, DWORD dwMoveMethod)
{
WINPR_FILE* pFile = (WINPR_FILE*) hFile;
int whence;
if (!hFile)
return FALSE;
switch(dwMoveMethod)
{
case FILE_BEGIN:
whence = SEEK_SET;
break;
case FILE_END:
whence = SEEK_END;
break;
case FILE_CURRENT:
whence = SEEK_CUR;
break;
default:
return FALSE;
}
if (fseek(pFile->fp, liDistanceToMove.QuadPart, whence))
{
WLog_ERR(TAG, "fseek(%s) failed with %s [0x%08X]", pFile->lpFileName,
strerror(errno), errno);
return FALSE;
}
if (lpNewFilePointer)
lpNewFilePointer->QuadPart = ftell(pFile->fp);
return TRUE;
}
static BOOL FileRead(PVOID Object, LPVOID lpBuffer, DWORD nNumberOfBytesToRead,
LPDWORD lpNumberOfBytesRead, LPOVERLAPPED lpOverlapped)
{
@ -550,7 +593,7 @@ static HANDLE_OPS fileOps = {
NULL, /* FlushFileBuffers */
FileSetEndOfFile,
FileSetFilePointer,
NULL, /* SetFilePointerEx */
FileSetFilePointerEx,
NULL, /* FileLockFile */
FileLockFileEx,
FileUnlockFile,