/*
 * Copyright 2008, Haiku.
 * Distributed under the terms of the MIT license.
 *
 * Authors:
 *              Michael Pfeiffer <laplace@users.sourceforge.net>
 */

#ifndef _PPD_FILE_H
#define _PPD_FILE_H

#include <File.h>
#include <String.h>

class Position {
public:
        int x;
        int y;
        Position()             : x(0), y(0) {}
        Position(int x, int y) : x(x), y(y) {}
};

#define kReadBufferSize 1024

class FileBuffer {
        BFile* fFile;
        
        unsigned char fBuffer[kReadBufferSize];
        int           fIndex;
        int           fSize;
        
public:
        FileBuffer(BFile* file) : fFile(file), fIndex(0), fSize(0) {}
        int Read();
};

class PPDFile {
private:
        BString  fFileName;
        BFile    fFile;
        PPDFile* fPreviousFile; // single linked list of PPD files (stack)
        Position fCurrentPosition;
        int      fCurrentChar;
        FileBuffer fBuffer;
        
public:
        // Opens the file for reading. Use IsValid to check if the file could
        // be opened successfully.
        // PPDFile also maintance a single linked list. The parameter previousFile
        // can be used to store a reference to a previous file.
        PPDFile(const char* file, PPDFile* previousFile = NULL);
        // Closes the file.
        ~PPDFile();
        
        // Returns the status of the constructor.
        status_t InitCheck();
        
        // Returns the current character or -1 if on EOF.
        int GetCurrentChar();
        // Reads the next character. Use GetChar to read the current 
        void NextChar();
        // Returns the position of the current character.
        Position GetPosition();
        // The previous file from the constructor.
        PPDFile* GetPreviousFile();
        // Returns the file name
        const char* GetFileName();
};

#endif