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/** \file
* \brief System Dependent Binary File Access.
*
* See Copyright Notice in im_lib.h
* $Id: im_sysfile_win32.cpp,v 1.2 2009/10/01 16:12:24 scuri Exp $
*/
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include <assert.h>
#include "im_util.h"
#include "im_binfile.h"
/* not defined in VC6 */
#ifndef INVALID_SET_FILE_POINTER
#define INVALID_SET_FILE_POINTER ((DWORD)-1)
#endif
class imBinSystemFile: public imBinFileBase
{
protected:
HANDLE FileHandle;
int Error;
unsigned long ReadBuf(void* pValues, unsigned long pSize);
unsigned long WriteBuf(void* pValues, unsigned long pSize);
public:
virtual void Open(const char* pFileName);
virtual void New(const char* pFileName);
virtual void Close();
unsigned long FileSize();
int HasError() const;
void SeekTo(unsigned long pOffset);
void SeekOffset(long pOffset);
void SeekFrom(long pOffset);
unsigned long Tell() const;
int EndOfFile() const;
};
imBinFileBase* iBinSystemFileNewFunc()
{
return new imBinSystemFile();
}
void imBinSystemFile::Open(const char* pFileName)
{
this->FileHandle = CreateFile(pFileName, GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
this->Error = (this->FileHandle == INVALID_HANDLE_VALUE)? 1: 0;
SetLastError(NO_ERROR);
InitByteOrder(imBinCPUByteOrder());
this->IsNew = 0;
}
void imBinSystemFile::New(const char* pFileName)
{
this->FileHandle = CreateFile(pFileName, GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL);
this->Error = (this->FileHandle == INVALID_HANDLE_VALUE)? 1: 0;
SetLastError(NO_ERROR);
InitByteOrder(imBinCPUByteOrder());
this->IsNew = 1;
}
void imBinSystemFile::Close()
{
if (this->FileHandle != INVALID_HANDLE_VALUE)
CloseHandle(this->FileHandle);
this->FileHandle = INVALID_HANDLE_VALUE;
this->Error = 1;
}
unsigned long imBinSystemFile::FileSize()
{
assert(this->FileHandle != INVALID_HANDLE_VALUE);
this->Error = 0;
DWORD Size = GetFileSize(this->FileHandle, NULL);
if (Size == INVALID_FILE_SIZE)
this->Error = 1;
return Size;
}
unsigned long imBinSystemFile::ReadBuf(void* pValues, unsigned long pSize)
{
assert(this->FileHandle != INVALID_HANDLE_VALUE);
this->Error = 0;
DWORD dwSize = 0;
ReadFile(this->FileHandle, pValues, pSize, &dwSize, NULL);
if (dwSize != pSize)
this->Error = 1;
return dwSize;
}
unsigned long imBinSystemFile::WriteBuf(void* pValues, unsigned long pSize)
{
assert(this->FileHandle != INVALID_HANDLE_VALUE);
this->Error = 0;
DWORD dwSize = 0;
WriteFile(this->FileHandle, pValues, pSize, &dwSize, NULL);
if (dwSize != pSize)
this->Error = 1;
return dwSize;
}
int imBinSystemFile::HasError() const
{
return this->Error;
}
void imBinSystemFile::SeekTo(unsigned long pOffset)
{
assert(this->FileHandle != INVALID_HANDLE_VALUE);
this->Error = 0;
DWORD ret = SetFilePointer(this->FileHandle, pOffset, NULL, FILE_BEGIN);
if (ret == INVALID_SET_FILE_POINTER)
this->Error = 1;
}
void imBinSystemFile::SeekOffset(long pOffset)
{
assert(this->FileHandle != INVALID_HANDLE_VALUE);
this->Error = 0;
DWORD ret = SetFilePointer(this->FileHandle, pOffset, NULL, FILE_CURRENT);
if (ret == INVALID_SET_FILE_POINTER)
this->Error = 1;
}
void imBinSystemFile::SeekFrom(long pOffset)
{
assert(this->FileHandle != INVALID_HANDLE_VALUE);
this->Error = 0;
DWORD ret = SetFilePointer(this->FileHandle, pOffset, NULL, FILE_END);
if (ret == INVALID_SET_FILE_POINTER)
this->Error = 1;
}
unsigned long imBinSystemFile::Tell() const
{
assert(this->FileHandle != INVALID_HANDLE_VALUE);
return SetFilePointer(this->FileHandle, 0, NULL, FILE_CURRENT);
}
int imBinSystemFile::EndOfFile() const
{
assert(this->FileHandle != INVALID_HANDLE_VALUE);
DWORD cur_pos = SetFilePointer(this->FileHandle, 0, NULL, FILE_CURRENT);
DWORD end_pos = SetFilePointer(this->FileHandle, 0, NULL, FILE_END);
SetFilePointer(this->FileHandle, cur_pos, NULL, FILE_CURRENT);
return (cur_pos == end_pos)? 1: 0;
}
class imBinSystemFileHandle: public imBinSystemFile
{
public:
virtual void Open(const char* pFileName);
virtual void New(const char* pFileName);
virtual void Close();
};
imBinFileBase* iBinSystemFileHandleNewFunc()
{
return new imBinSystemFileHandle();
}
void imBinSystemFileHandle::Open(const char* pFileName)
{
// the file was successfully opened already the client
HANDLE file_handle = (HANDLE)pFileName;
this->FileHandle = file_handle;
InitByteOrder(imBinCPUByteOrder());
this->IsNew = 0;
this->Error = 0;
}
void imBinSystemFileHandle::New(const char* pFileName)
{
// the file was successfully opened already the client
HANDLE file_handle = (HANDLE)pFileName;
this->FileHandle = file_handle;
InitByteOrder(imBinCPUByteOrder());
this->IsNew = 1;
this->Error = 0;
}
void imBinSystemFileHandle::Close()
{
// does nothing, the client must close the file
}
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