// cFile.h
// Interfaces to the cFile class providing an OS-independent abstraction of a file.
/*
The object is optimized towards binary reads.
The object has no multithreading locks, don't use from multiple threads!
Usage:
1, Construct a cFile instance (no-param constructor)
2, Open a file using Open(), check return value for success
3, Read / write
4, Destroy the instance
-- OR --
1, Construct a cFile instance opening the file (filename-param constructor)
2, Check if the file was opened using IsOpen()
3, Read / write
4, Destroy the instance
*/
#pragma once
#ifndef CFILE_H_INCLUDED
#define CFILE_H_INCLUDED
#ifndef _WIN32
#define USE_STDIO_FILE
#endif // _WIN32
// DEBUG:
#define USE_STDIO_FILE
class cFile
{
public:
/// The mode in which to open the file
enum EMode
{
fmRead, // Read-only. If the file doesn't exist, object will not be valid
fmWrite, // Write-only. If the file already exists, it will be overwritten
fmReadWrite, // Read/write. If the file already exists, it will be left intact; writing will overwrite the data from the beginning
} ;
/// Simple constructor - creates an unopened file object, use Open() to open / create a real file
cFile(void);
/// Constructs and opens / creates the file specified, use IsOpen() to check for success
cFile(const AString & iFileName, EMode iMode);
/// Auto-closes the file, if open
~cFile();
bool Open(const AString & iFileName, EMode iMode);
void Close(void);
bool IsOpen(void) const;
bool IsEOF(void) const;
/// Reads up to iNumBytes bytes into iBuffer, returns the number of bytes actually read, or -1 on failure; asserts if not open
int Read (void * iBuffer, int iNumBytes);
/// Writes up to iNumBytes bytes from iBuffer, returns the number of bytes actually written, or -1 on failure; asserts if not open
int Write(const void * iBuffer, int iNumBytes);
/// Seeks to iPosition bytes from file start, returns old position or -1 for failure; asserts if not open
int Seek (int iPosition);
/// Returns the current position (bytes from file start) or -1 for failure; asserts if not open
int Tell (void) const;
/// Returns the size of file, in bytes, or -1 for failure; asserts if not open
int GetSize(void) const;
/// Reads the file from current position till EOF into an AString; returns the number of bytes read or -1 for error
int ReadRestOfFile(AString & a_Contents);
/// Returns true if the file specified exists
static bool Exists(const AString & a_FileName);
private:
#ifdef USE_STDIO_FILE
FILE * m_File;
#else
HANDLE m_File;
#endif
} ;
#endif // CFILE_H_INCLUDED
