// vim: set ts=4 sw=4 tw=99 noet:
//
// AMX Mod X, based on AMX Mod by Aleksander Naszko ("OLO").
// Copyright (C) The AMX Mod X Development Team.
//
// This software is licensed under the GNU General Public License, version 3 or higher.
// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
//     https://alliedmods.net/amxmodx-license

#ifndef __AMXXFILE_H__
#define __AMXXFILE_H__

#define MAGIC_HEADER		0x414D5842
#define MAGIC_HEADER2		0x414D5858
#define	MAGIC_VERSION		0x0300

typedef char		mint8_t;
typedef int16_t		mint16_t;
typedef int32_t		mint32_t;

struct PluginEntry
{
	mint8_t cellsize;	//cell size
	int32_t imagesize;	//uncompressed image size
	int32_t disksize;	//compressed image size
	int32_t memsize;	//memory image size
	int32_t offs;		//file offset
};

struct BinHeader
{
	int32_t		magic;
	mint16_t	version;
	mint8_t		numPlugins;
	PluginEntry *plugins;
};

class CAmxxReader
{
public:
	enum Error
	{
		Err_None=0,
		Err_InvalidParam,
		Err_FileOpen,
		Err_FileRead,
		Err_FileInvalid,
		Err_SectionNotFound,
		Err_DecompressorInit,
		Err_Decompress,
		Err_OldFile,
	};

private:
	Error m_Status;
	FILE *m_pFile;

	bool m_OldFile;					// old .amx file
	bool m_AmxxFile;				// new 'AMXX' header format
	BinHeader m_Bh;					// binary header
	int m_Entry;					// entry #

	int m_CellSize;
	int m_SectionHdrOffset;			// offset to the table in the header that describes the required section
	int m_SectionLength;
public:
	CAmxxReader(const char *filename, int cellsize);
	~CAmxxReader();

	Error GetStatus();						// Get the current status
	size_t GetBufferSize();					// Get the size for the buffer
	Error GetSection(void *buffer);			// Copy the currently selected section to the buffer
	inline bool IsOldFile() const { return m_OldFile; }
};

#endif // __AMXXFILE_H__