framework/delibs/deutil/deFile.c - third_party/vulkan-cts - Git at Google

 /*-------------------------------------------------------------------------
  * drawElements Utility Library
  * ----------------------------
  *
  * Copyright 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  *//*!
  * \file
  * \brief File abstraction.
  *//*--------------------------------------------------------------------*/

 #include "deFile.h"
 #include "deMemory.h"

 #if (DE_OS == DE_OS_UNIX) || (DE_OS == DE_OS_OSX) || (DE_OS == DE_OS_IOS) || (DE_OS == DE_OS_ANDROID) || (DE_OS == DE_OS_SYMBIAN) || (DE_OS == DE_OS_QNX)

 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>

 struct deFile_s
 {
 	int fd;
 };

 deBool deFileExists (const char* filename)
 {
 	struct stat st;
 	int result = stat(filename, &st);
 	return result == 0;
 }

 deBool deDeleteFile (const char* filename)
 {
 	return unlink(filename) == 0;
 }

 deFile* deFile_createFromHandle (deUintptr handle)
 {
 	int		fd		= (int)handle;
 	deFile* file	= (deFile*)deCalloc(sizeof(deFile));
 	if (!file)
 	{
 		close(fd);
 		return file;
 	}

 	file->fd = fd;
 	return file;
 }

 static int mapOpenMode (deFileMode mode)
 {
 	int flag = 0;

 	/* Read, write or read and write access is required. */
 	DE_ASSERT((mode & DE_FILEMODE_READ) != 0 || ((mode & DE_FILEMODE_WRITE) != 0));

 	/* Create, open or create and open mode is required. */
 	DE_ASSERT((mode & DE_FILEMODE_OPEN) != 0 || ((mode & DE_FILEMODE_CREATE) != 0));

 	/* Require write when using create. */
 	DE_ASSERT(!(mode & DE_FILEMODE_CREATE) || (mode & DE_FILEMODE_WRITE));

 	/* Require write and open when using truncate */
 	DE_ASSERT(!(mode & DE_FILEMODE_TRUNCATE) || ((mode & DE_FILEMODE_WRITE) && (mode & DE_FILEMODE_OPEN)));

 	if (mode & DE_FILEMODE_READ)
 		flag |= O_RDONLY;

 	if (mode & DE_FILEMODE_WRITE)
 		flag |= O_WRONLY;

 	if (mode & DE_FILEMODE_TRUNCATE)
 		flag |= O_TRUNC;

 	if (mode & DE_FILEMODE_CREATE)
 		flag |= O_CREAT;

 	if (!(mode & DE_FILEMODE_OPEN))
 		flag |= O_EXCL;

 	return flag;
 }

 deFile* deFile_create (const char* filename, deUint32 mode)
 {
 	int fd = open(filename, mapOpenMode(mode), 0777);
 	if (fd >= 0)
 		return deFile_createFromHandle((deUintptr)fd);
 	else
 		return DE_NULL;
 }

 void deFile_destroy (deFile* file)
 {
 	close(file->fd);
 	deFree(file);
 }

 deBool deFile_setFlags (deFile* file, deUint32 flags)
 {
 	/* Non-blocking. */
 	{
 		int oldFlags = fcntl(file->fd, F_GETFL, 0);
 		int newFlags = (flags & DE_FILE_NONBLOCKING) ? (oldFlags | O_NONBLOCK) : (oldFlags & ~O_NONBLOCK);
 		if (fcntl(file->fd, F_SETFL, newFlags) != 0)
 			return DE_FALSE;
 	}

 	/* Close on exec. */
 	{
 		int oldFlags = fcntl(file->fd, F_GETFD, 0);
 		int newFlags = (flags & DE_FILE_CLOSE_ON_EXEC) ? (oldFlags | FD_CLOEXEC) : (oldFlags & ~FD_CLOEXEC);
 		if (fcntl(file->fd, F_SETFD, newFlags) != 0)
 			return DE_FALSE;
 	}

 	return DE_TRUE;
 }

 static int mapSeekPosition (deFilePosition position)
 {
 	switch (position)
 	{
 		case DE_FILEPOSITION_BEGIN:		return SEEK_SET;
 		case DE_FILEPOSITION_END:		return SEEK_END;
 		case DE_FILEPOSITION_CURRENT:	return SEEK_CUR;
 		default:
 			DE_ASSERT(DE_FALSE);
 			return 0;
 	}
 }

 deBool deFile_seek (deFile* file, deFilePosition base, deInt64 offset)
 {
 	return lseek(file->fd, (off_t)offset, mapSeekPosition(base)) >= 0;
 }

 deInt64 deFile_getPosition (const deFile* file)
 {
 	return lseek(file->fd, 0, SEEK_CUR);
 }

 deInt64 deFile_getSize (const deFile* file)
 {
 	deInt64 size	= 0;
 	deInt64 curPos	= lseek(file->fd, 0, SEEK_CUR);

 	if (curPos < 0)
 		return -1;

 	size = lseek(file->fd, 0, SEEK_END);

 	if (size < 0)
 		return -1;

 	lseek(file->fd, (off_t)curPos, SEEK_SET);

 	return size;
 }

 static deFileResult mapReadWriteResult (deInt64 numBytes)
 {
 	if (numBytes > 0)
 		return DE_FILERESULT_SUCCESS;
 	else if (numBytes == 0)
 		return DE_FILERESULT_END_OF_FILE;
 	else
 		return errno == EAGAIN ? DE_FILERESULT_WOULD_BLOCK : DE_FILERESULT_ERROR;
 }

 deFileResult deFile_read (deFile* file, void* buf, deInt64 bufSize, deInt64* numReadPtr)
 {
 	deInt64 numRead = read(file->fd, buf, (size_t)bufSize);

 	if (numReadPtr)
 		*numReadPtr = numRead;

 	return mapReadWriteResult(numRead);
 }

 deFileResult deFile_write (deFile* file, const void* buf, deInt64 bufSize, deInt64* numWrittenPtr)
 {
 	deInt64 numWritten = write(file->fd, buf, (size_t)bufSize);

 	if (numWrittenPtr)
 		*numWrittenPtr = numWritten;

 	return mapReadWriteResult(numWritten);
 }

 #elif (DE_OS == DE_OS_WIN32)

 #define VC_EXTRALEAN
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>

 struct deFile_s
 {
 	HANDLE handle;
 };

 deBool deFileExists (const char* filename)
 {
 	return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
 }

 deBool deDeleteFile (const char* filename)
 {
 	return DeleteFile(filename) == TRUE;
 }

 deFile* deFile_createFromHandle (deUintptr handle)
 {
 	deFile* file = (deFile*)deCalloc(sizeof(deFile));
 	if (!file)
 	{
 		CloseHandle((HANDLE)handle);
 		return file;
 	}

 	file->handle = (HANDLE)handle;
 	return file;
 }

 deFile* deFile_create (const char* filename, deUint32 mode)
 {
 	DWORD	access		= 0;
 	DWORD	create		= OPEN_EXISTING;
 	HANDLE	handle		= DE_NULL;

 	/* Read, write or read and write access is required. */
 	DE_ASSERT((mode & DE_FILEMODE_READ) != 0 || ((mode & DE_FILEMODE_WRITE) != 0));

 	/* Create, open or create and open mode is required. */
 	DE_ASSERT((mode & DE_FILEMODE_OPEN) != 0 || ((mode & DE_FILEMODE_CREATE) != 0));

 	/* Require write when using create. */
 	DE_ASSERT(!(mode & DE_FILEMODE_CREATE) || (mode & DE_FILEMODE_WRITE));

 	/* Require write and open when using truncate */
 	DE_ASSERT(!(mode & DE_FILEMODE_TRUNCATE) || ((mode & DE_FILEMODE_WRITE) && (mode & DE_FILEMODE_OPEN)));


 	if (mode & DE_FILEMODE_READ)
 		access |= GENERIC_READ;

 	if (mode & DE_FILEMODE_WRITE)
 		access |= GENERIC_WRITE;

 	if ((mode & DE_FILEMODE_TRUNCATE))
 	{
 		if ((mode & DE_FILEMODE_CREATE) && (mode & DE_FILEMODE_OPEN))
 			create = CREATE_ALWAYS;
 		else if (mode & DE_FILEMODE_OPEN)
 			create = TRUNCATE_EXISTING;
 		else
 			DE_ASSERT(DE_FALSE);
 	}
 	else
 	{
 		if ((mode & DE_FILEMODE_CREATE) && (mode & DE_FILEMODE_OPEN))
 			create = OPEN_ALWAYS;
 		else if (mode & DE_FILEMODE_CREATE)
 			create = CREATE_NEW;
 		else if (mode & DE_FILEMODE_OPEN)
 			create = OPEN_EXISTING;
 		else
 			DE_ASSERT(DE_FALSE);
 	}

 	handle = CreateFile(filename, access, FILE_SHARE_DELETE|FILE_SHARE_READ|FILE_SHARE_WRITE, DE_NULL, create, FILE_ATTRIBUTE_NORMAL, DE_NULL);
 	if (handle == INVALID_HANDLE_VALUE)
 		return DE_NULL;

 	return deFile_createFromHandle((deUintptr)handle);
 }

 void deFile_destroy (deFile* file)
 {
 	CloseHandle(file->handle);
 	deFree(file);
 }

 deBool deFile_setFlags (deFile* file, deUint32 flags)
 {
 	/* Non-blocking. */
 	if (flags & DE_FILE_NONBLOCKING)
 		return DE_FALSE; /* Not supported. */

 	/* Close on exec. */
 	if (!SetHandleInformation(file->handle, HANDLE_FLAG_INHERIT, (flags & DE_FILE_CLOSE_ON_EXEC) ? HANDLE_FLAG_INHERIT : 0))
 		return DE_FALSE;

 	return DE_TRUE;
 }

 deBool deFile_seek (deFile* file, deFilePosition base, deInt64 offset)
 {
 	DWORD	method		= 0;
 	LONG	lowBits		= (LONG)(offset & 0xFFFFFFFFll);
 	LONG	highBits	= (LONG)((offset >> 32) & 0xFFFFFFFFll);

 	switch (base)
 	{
 		case DE_FILEPOSITION_BEGIN:		method = FILE_BEGIN;	break;
 		case DE_FILEPOSITION_END:		method = FILE_END;		break;
 		case DE_FILEPOSITION_CURRENT:	method = FILE_CURRENT;	break;
 		default:
 			DE_ASSERT(DE_FALSE);
 			return DE_FALSE;
 	}

 	return SetFilePointer(file->handle, lowBits, &highBits, method) != INVALID_SET_FILE_POINTER;
 }

 deInt64 deFile_getPosition (const deFile* file)
 {
 	LONG	highBits	= 0;
 	LONG	lowBits		= SetFilePointer(file->handle, 0, &highBits, FILE_CURRENT);

 	return (deInt64)(((deUint64)highBits << 32) | (deUint64)lowBits);
 }

 deInt64 deFile_getSize (const deFile* file)
 {
 	DWORD	highBits	= 0;
 	DWORD	lowBits		= GetFileSize(file->handle, &highBits);

 	return (deInt64)(((deUint64)highBits << 32) | (deUint64)lowBits);
 }

 static deFileResult mapReadWriteResult (BOOL retVal, DWORD numBytes)
 {
 	if (retVal && numBytes > 0)
 		return DE_FILERESULT_SUCCESS;
 	else if (retVal && numBytes == 0)
 		return DE_FILERESULT_END_OF_FILE;
 	else
 	{
 		DWORD error = GetLastError();

 		if (error == ERROR_HANDLE_EOF)
 			return DE_FILERESULT_END_OF_FILE;
 		else
 			return DE_FILERESULT_ERROR;
 	}
 }

 deFileResult deFile_read (deFile* file, void* buf, deInt64 bufSize, deInt64* numReadPtr)
 {
 	DWORD	bufSize32	= (DWORD)bufSize;
 	DWORD	numRead32	= 0;
 	BOOL	result;

 	/* \todo [2011-10-03 pyry] 64-bit IO. */
 	DE_ASSERT((deInt64)bufSize32 == bufSize);

 	result = ReadFile(file->handle, buf, bufSize32, &numRead32, DE_NULL);

 	if (numReadPtr)
 		*numReadPtr = (deInt64)numRead32;

 	return mapReadWriteResult(result, numRead32);
 }

 deFileResult deFile_write (deFile* file, const void* buf, deInt64 bufSize, deInt64* numWrittenPtr)
 {
 	DWORD	bufSize32		= (DWORD)bufSize;
 	DWORD	numWritten32	= 0;
 	BOOL	result;

 	/* \todo [2011-10-03 pyry] 64-bit IO. */
 	DE_ASSERT((deInt64)bufSize32 == bufSize);

 	result = WriteFile(file->handle, buf, bufSize32, &numWritten32, DE_NULL);

 	if (numWrittenPtr)
 		*numWrittenPtr = (deInt64)numWritten32;

 	return mapReadWriteResult(result, numWritten32);
 }

 #else
 #	error Implement deFile for your OS.
 #endif
	/*-------------------------------------------------------------------------
	* drawElements Utility Library
	* ----------------------------
	*
	* Copyright 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	//!
	* \file
	* \brief File abstraction.
	//--------------------------------------------------------------------*/

	#include "deFile.h"
	#include "deMemory.h"

	#if (DE_OS == DE_OS_UNIX) \|\| (DE_OS == DE_OS_OSX) \|\| (DE_OS == DE_OS_IOS) \|\| (DE_OS == DE_OS_ANDROID) \|\| (DE_OS == DE_OS_SYMBIAN) \|\| (DE_OS == DE_OS_QNX)

	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <errno.h>

	struct deFile_s
	{
	int fd;
	};

	deBool deFileExists (const char* filename)
	{
	struct stat st;
	int result = stat(filename, &st);
	return result == 0;
	}

	deBool deDeleteFile (const char* filename)
	{
	return unlink(filename) == 0;
	}

	deFile* deFile_createFromHandle (deUintptr handle)
	{
	int fd = (int)handle;
	deFile* file = (deFile*)deCalloc(sizeof(deFile));
	if (!file)
	{
	close(fd);
	return file;
	}

	file->fd = fd;
	return file;
	}

	static int mapOpenMode (deFileMode mode)
	{
	int flag = 0;

	/* Read, write or read and write access is required. */
	DE_ASSERT((mode & DE_FILEMODE_READ) != 0 \|\| ((mode & DE_FILEMODE_WRITE) != 0));

	/* Create, open or create and open mode is required. */
	DE_ASSERT((mode & DE_FILEMODE_OPEN) != 0 \|\| ((mode & DE_FILEMODE_CREATE) != 0));

	/* Require write when using create. */
	DE_ASSERT(!(mode & DE_FILEMODE_CREATE) \|\| (mode & DE_FILEMODE_WRITE));

	/* Require write and open when using truncate */
	DE_ASSERT(!(mode & DE_FILEMODE_TRUNCATE) \|\| ((mode & DE_FILEMODE_WRITE) && (mode & DE_FILEMODE_OPEN)));

	if (mode & DE_FILEMODE_READ)
	flag \|= O_RDONLY;

	if (mode & DE_FILEMODE_WRITE)
	flag \|= O_WRONLY;

	if (mode & DE_FILEMODE_TRUNCATE)
	flag \|= O_TRUNC;

	if (mode & DE_FILEMODE_CREATE)
	flag \|= O_CREAT;

	if (!(mode & DE_FILEMODE_OPEN))
	flag \|= O_EXCL;

	return flag;
	}

	deFile* deFile_create (const char* filename, deUint32 mode)
	{
	int fd = open(filename, mapOpenMode(mode), 0777);
	if (fd >= 0)
	return deFile_createFromHandle((deUintptr)fd);
	else
	return DE_NULL;
	}

	void deFile_destroy (deFile* file)
	{
	close(file->fd);
	deFree(file);
	}

	deBool deFile_setFlags (deFile* file, deUint32 flags)
	{
	/* Non-blocking. */
	{
	int oldFlags = fcntl(file->fd, F_GETFL, 0);
	int newFlags = (flags & DE_FILE_NONBLOCKING) ? (oldFlags \| O_NONBLOCK) : (oldFlags & ~O_NONBLOCK);
	if (fcntl(file->fd, F_SETFL, newFlags) != 0)
	return DE_FALSE;
	}

	/* Close on exec. */
	{
	int oldFlags = fcntl(file->fd, F_GETFD, 0);
	int newFlags = (flags & DE_FILE_CLOSE_ON_EXEC) ? (oldFlags \| FD_CLOEXEC) : (oldFlags & ~FD_CLOEXEC);
	if (fcntl(file->fd, F_SETFD, newFlags) != 0)
	return DE_FALSE;
	}

	return DE_TRUE;
	}

	static int mapSeekPosition (deFilePosition position)
	{
	switch (position)
	{
	case DE_FILEPOSITION_BEGIN: return SEEK_SET;
	case DE_FILEPOSITION_END: return SEEK_END;
	case DE_FILEPOSITION_CURRENT: return SEEK_CUR;
	default:
	DE_ASSERT(DE_FALSE);
	return 0;
	}
	}

	deBool deFile_seek (deFile* file, deFilePosition base, deInt64 offset)
	{
	return lseek(file->fd, (off_t)offset, mapSeekPosition(base)) >= 0;
	}

	deInt64 deFile_getPosition (const deFile* file)
	{
	return lseek(file->fd, 0, SEEK_CUR);
	}

	deInt64 deFile_getSize (const deFile* file)
	{
	deInt64 size = 0;
	deInt64 curPos = lseek(file->fd, 0, SEEK_CUR);

	if (curPos < 0)
	return -1;

	size = lseek(file->fd, 0, SEEK_END);

	if (size < 0)
	return -1;

	lseek(file->fd, (off_t)curPos, SEEK_SET);

	return size;
	}

	static deFileResult mapReadWriteResult (deInt64 numBytes)
	{
	if (numBytes > 0)
	return DE_FILERESULT_SUCCESS;
	else if (numBytes == 0)
	return DE_FILERESULT_END_OF_FILE;
	else
	return errno == EAGAIN ? DE_FILERESULT_WOULD_BLOCK : DE_FILERESULT_ERROR;
	}

	deFileResult deFile_read (deFile* file, void* buf, deInt64 bufSize, deInt64* numReadPtr)
	{
	deInt64 numRead = read(file->fd, buf, (size_t)bufSize);

	if (numReadPtr)
	*numReadPtr = numRead;

	return mapReadWriteResult(numRead);
	}

	deFileResult deFile_write (deFile* file, const void* buf, deInt64 bufSize, deInt64* numWrittenPtr)
	{
	deInt64 numWritten = write(file->fd, buf, (size_t)bufSize);

	if (numWrittenPtr)
	*numWrittenPtr = numWritten;

	return mapReadWriteResult(numWritten);
	}

	#elif (DE_OS == DE_OS_WIN32)

	#define VC_EXTRALEAN
	#define WIN32_LEAN_AND_MEAN
	#include <windows.h>

	struct deFile_s
	{
	HANDLE handle;
	};

	deBool deFileExists (const char* filename)
	{
	return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
	}

	deBool deDeleteFile (const char* filename)
	{
	return DeleteFile(filename) == TRUE;
	}

	deFile* deFile_createFromHandle (deUintptr handle)
	{
	deFile* file = (deFile*)deCalloc(sizeof(deFile));
	if (!file)
	{
	CloseHandle((HANDLE)handle);
	return file;
	}

	file->handle = (HANDLE)handle;
	return file;
	}

	deFile* deFile_create (const char* filename, deUint32 mode)
	{
	DWORD access = 0;
	DWORD create = OPEN_EXISTING;
	HANDLE handle = DE_NULL;

	/* Read, write or read and write access is required. */
	DE_ASSERT((mode & DE_FILEMODE_READ) != 0 \|\| ((mode & DE_FILEMODE_WRITE) != 0));

	/* Create, open or create and open mode is required. */
	DE_ASSERT((mode & DE_FILEMODE_OPEN) != 0 \|\| ((mode & DE_FILEMODE_CREATE) != 0));

	/* Require write when using create. */
	DE_ASSERT(!(mode & DE_FILEMODE_CREATE) \|\| (mode & DE_FILEMODE_WRITE));

	/* Require write and open when using truncate */
	DE_ASSERT(!(mode & DE_FILEMODE_TRUNCATE) \|\| ((mode & DE_FILEMODE_WRITE) && (mode & DE_FILEMODE_OPEN)));


	if (mode & DE_FILEMODE_READ)
	access \|= GENERIC_READ;

	if (mode & DE_FILEMODE_WRITE)
	access \|= GENERIC_WRITE;

	if ((mode & DE_FILEMODE_TRUNCATE))
	{
	if ((mode & DE_FILEMODE_CREATE) && (mode & DE_FILEMODE_OPEN))
	create = CREATE_ALWAYS;
	else if (mode & DE_FILEMODE_OPEN)
	create = TRUNCATE_EXISTING;
	else
	DE_ASSERT(DE_FALSE);
	}
	else
	{
	if ((mode & DE_FILEMODE_CREATE) && (mode & DE_FILEMODE_OPEN))
	create = OPEN_ALWAYS;
	else if (mode & DE_FILEMODE_CREATE)
	create = CREATE_NEW;
	else if (mode & DE_FILEMODE_OPEN)
	create = OPEN_EXISTING;
	else
	DE_ASSERT(DE_FALSE);
	}

	handle = CreateFile(filename, access, FILE_SHARE_DELETE\|FILE_SHARE_READ\|FILE_SHARE_WRITE, DE_NULL, create, FILE_ATTRIBUTE_NORMAL, DE_NULL);
	if (handle == INVALID_HANDLE_VALUE)
	return DE_NULL;

	return deFile_createFromHandle((deUintptr)handle);
	}

	void deFile_destroy (deFile* file)
	{
	CloseHandle(file->handle);
	deFree(file);
	}

	deBool deFile_setFlags (deFile* file, deUint32 flags)
	{
	/* Non-blocking. */
	if (flags & DE_FILE_NONBLOCKING)
	return DE_FALSE; /* Not supported. */

	/* Close on exec. */
	if (!SetHandleInformation(file->handle, HANDLE_FLAG_INHERIT, (flags & DE_FILE_CLOSE_ON_EXEC) ? HANDLE_FLAG_INHERIT : 0))
	return DE_FALSE;

	return DE_TRUE;
	}

	deBool deFile_seek (deFile* file, deFilePosition base, deInt64 offset)
	{
	DWORD method = 0;
	LONG lowBits = (LONG)(offset & 0xFFFFFFFFll);
	LONG highBits = (LONG)((offset >> 32) & 0xFFFFFFFFll);

	switch (base)
	{
	case DE_FILEPOSITION_BEGIN: method = FILE_BEGIN; break;
	case DE_FILEPOSITION_END: method = FILE_END; break;
	case DE_FILEPOSITION_CURRENT: method = FILE_CURRENT; break;
	default:
	DE_ASSERT(DE_FALSE);
	return DE_FALSE;
	}

	return SetFilePointer(file->handle, lowBits, &highBits, method) != INVALID_SET_FILE_POINTER;
	}

	deInt64 deFile_getPosition (const deFile* file)
	{
	LONG highBits = 0;
	LONG lowBits = SetFilePointer(file->handle, 0, &highBits, FILE_CURRENT);

	return (deInt64)(((deUint64)highBits << 32) \| (deUint64)lowBits);
	}

	deInt64 deFile_getSize (const deFile* file)
	{
	DWORD highBits = 0;
	DWORD lowBits = GetFileSize(file->handle, &highBits);

	return (deInt64)(((deUint64)highBits << 32) \| (deUint64)lowBits);
	}

	static deFileResult mapReadWriteResult (BOOL retVal, DWORD numBytes)
	{
	if (retVal && numBytes > 0)
	return DE_FILERESULT_SUCCESS;
	else if (retVal && numBytes == 0)
	return DE_FILERESULT_END_OF_FILE;
	else
	{
	DWORD error = GetLastError();

	if (error == ERROR_HANDLE_EOF)
	return DE_FILERESULT_END_OF_FILE;
	else
	return DE_FILERESULT_ERROR;
	}
	}

	deFileResult deFile_read (deFile* file, void* buf, deInt64 bufSize, deInt64* numReadPtr)
	{
	DWORD bufSize32 = (DWORD)bufSize;
	DWORD numRead32 = 0;
	BOOL result;

	/* \todo [2011-10-03 pyry] 64-bit IO. */
	DE_ASSERT((deInt64)bufSize32 == bufSize);

	result = ReadFile(file->handle, buf, bufSize32, &numRead32, DE_NULL);

	if (numReadPtr)
	*numReadPtr = (deInt64)numRead32;

	return mapReadWriteResult(result, numRead32);
	}

	deFileResult deFile_write (deFile* file, const void* buf, deInt64 bufSize, deInt64* numWrittenPtr)
	{
	DWORD bufSize32 = (DWORD)bufSize;
	DWORD numWritten32 = 0;
	BOOL result;

	/* \todo [2011-10-03 pyry] 64-bit IO. */
	DE_ASSERT((deInt64)bufSize32 == bufSize);

	result = WriteFile(file->handle, buf, bufSize32, &numWritten32, DE_NULL);

	if (numWrittenPtr)
	*numWrittenPtr = (deInt64)numWritten32;

	return mapReadWriteResult(result, numWritten32);
	}

	#else
	# error Implement deFile for your OS.
	#endif