/*
    This file is part of SGI Format, a File Format plugin for Adobe Photoshop
    Copyright (C) 2003-2010 Toby Thain, toby@telegraphics.com.au

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "world.h"

#include "PIFormat.h"
#include "PIDefines.h" // samplecode/common

#include "entry.h" // must come after Photoshop includes

#include "file_io.h"
#include "str.h"
#include "bufio.h"

#include "sgi.h"


#define F (FILEREF)pb->dataFork

//#define dbg(s)

struct revertinfo{
	/* fetched at Open and kept with the document (revertInfo handle) */
	Boolean rle;
};

extern FormatRecordPtr gpb;

enum{ CHUNK_ROWS = 64 };

void putrevertinfo(FormatRecordPtr pb, struct revertinfo *p);
int getrevertinfo(FormatRecordPtr pb, struct revertinfo *p);

Boolean is_sgi(FILEREF r,struct sgi_header *h);
OSErr read_sgi_header(FILEREF f,struct sgi_header *h);
OSErr write_sgi_header(FILEREF f,struct sgi_header *h);

void expandrow(unsigned char *optr,unsigned char *iptr,long n);
void expandrow2(unsigned short *optr,unsigned short *iptr,long n);
void swapbytes(unsigned char *p,int n);
OSErr checkpoint(FormatRecordPtr pb,unsigned i);
OSErr readchannel(FormatRecordPtr pb);
OSErr read_prepare(FormatRecordPtr pb);
OSErr read_start(FormatRecordPtr pb);
OSErr read_continue(FormatRecordPtr pb);
OSErr read_finish(FormatRecordPtr pb);
OSErr options_start(FormatRecordPtr pb);

Boolean ReadScriptParamsOnWrite(FormatRecordPtr pb);
OSErr WriteScriptParamsOnWrite(FormatRecordPtr pb);

long compressrow(unsigned char *src,unsigned char *dst,long n);
long compressrow2(unsigned short *src,unsigned short *dst,long n);
void getchannel(FormatRecordPtr pb);
OSErr write_start(FormatRecordPtr pb);
OSErr write_continue(FormatRecordPtr pb);
OSErr write_finish(FormatRecordPtr pb);


#define PS_NEWHANDLE     (pb->hostNewHdl)
#define PS_DISPOSEHANDLE (pb->hostDisposeHdl)
#define PS_LOCKHANDLE    (pb->handleProcs->lockProc)
#define PS_UNLOCKHANDLE  (pb->handleProcs->unlockProc)