jam_io.h

/* Keen Dreams Source Code
 * Copyright (C) 2014 Javier M. Chavez
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

//
// UNIT : JAM_IO.h
//
// FUNCTION : General defines, prototypes, typedefs used in all the
//				  supported compression techniques used in JAMPAK Ver x.x
//
//




//==========================================================================
//
//	  							PARAMETER PASSING TYPES
//
//
	// SOURCE PARAMS (LO BYTE)

#define SRC_FILE	 			(0x0001)			// GE Buffered IO
#define SRC_FFILE				(0x0002)			// Stdio File IO (fwrite etc.)
#define SRC_MEM				(0x0004)			// Std void ptr (alloc etc)
#define SRC_BFILE				(0x0008)				// Buffered File I/O

#define SRC_TYPES 			(SRC_FILE | SRC_FFILE | SRC_MEM | SRC_BFILE)

	// DESTINATION PARAMS (HI BYTE)

#define DEST_FILE				(0x0100)			// GE Buffered IO
#define DEST_FFILE			(0x0200)			// Stdio File IO (fwrite etc.)
#define DEST_MEM				(0x0400)			// Std void ptr (alloc etc)
#define DEST_IMEM				(0x0800)			// ID Memory alloc

#define DEST_TYPES 			(DEST_FILE | DEST_FFILE | DEST_MEM | DEST_IMEM)



//=========================================================================
//
// 								FILE CHUNK IDs
//
// NOTE: The only reason for changing from COMP to CMP1 and having multi
//			comp header structs is for downward compatablity.
//

#define COMP					("COMP")		// Comp type is ct_LZW ALWAYS!
#define CMP1					("CMP1")		// Comp type is determined in header.


//
// 	COMPRESSION TYPES
//
typedef enum ct_TYPES
{
		ct_NONE = 0,						// No compression - Just data..Rarely used!
		ct_LZW,								// LZW data compression
		ct_LZH,

} ct_TYPES;

//
//  	FILE CHUNK HEADER FORMATS
//

struct COMPStruct
{
	unsigned long DecompLen;

};


struct CMP1Header
{
	unsigned CompType;					// SEE: ct_TYPES above for list of pos.
	unsigned long OrginalLen;			// Orginal FileLength of compressed Data.
	unsigned long CompressLen;			// Length of data after compression (A MUST for LZHUFF!)
};



//---------------------------------------------------------------------------
//
//								FUNCTION PROTOTYPEING
//
//---------------------------------------------------------------------------

char WritePtr(long outfile, unsigned char data, unsigned PtrType);
int ReadPtr(long infile, unsigned PtrType);