/*
    This file is part of PSPFormat, a File Format plugin for Adobe Photoshop
    Copyright (C) 2003-7 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 "pspformat.h"

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

#include "str.h"
#include "ui.h"

long prepare(long);

int lastsel = -1;
FormatRecordPtr gpb;

// MPW MrC requires a prototype
DLLEXPORT
MACPASCAL void PluginMain(short selector, FormatRecordPtr pb, intptr_t *data, short *result);

DLLEXPORT
MACPASCAL void PluginMain(short selector, FormatRecordPtr pb, intptr_t *data, short *result){
	OSErr e = noErr;
	PSP_file_header h;

	if(selector != formatSelectorAbout && !*data){
		BufferID tempId;
		if( (*result = PS_BUFFER_ALLOC(sizeof(globals), &tempId)) )
			return;
		*data = (intptr_t)PS_BUFFER_LOCK(tempId, true);
	}

	EnterCodeResource();

	gpb = pb;

	/* Perform the requested operation */

	switch (selector){
	case formatSelectorAbout:
		DoAbout((AboutRecordPtr)pb);
		break;

	case formatSelectorEstimatePrepare:
	case formatSelectorWritePrepare:
	case formatSelectorReadPrepare:
		pb->maxData = prepare(pb->maxData);
		break;

	case formatSelectorReadStart:    e = read_start(pb, data); break;
	case formatSelectorReadContinue: e = read_continue(pb, data); break;
	case formatSelectorReadFinish:   e = read_finish(pb, data); break;

	case formatSelectorOptionsPrepare:
		pb->maxData = 0; // no buffers are allocated in Options
		break;
	case formatSelectorOptionsStart:
		e = options_start(pb, data);
	case formatSelectorOptionsContinue:
		pb->data = NULL;
	case formatSelectorOptionsFinish:
		break;

	case formatSelectorEstimateStart:	 e = estimate_start(pb, data); break;
	//case formatSelectorEstimateContinue: e = estimate_continue(pb, data); break;
	case formatSelectorEstimateFinish:	 e = estimate_finish(pb, data); break;

	case formatSelectorWriteStart:    e = write_start(pb, data); break;
	case formatSelectorWriteContinue: e = write_continue(pb, data); break;
	case formatSelectorWriteFinish:   e = write_finish(pb, data); break;

	case formatSelectorFilterFile:
		e = headerok((FILEREF)pb->dataFork, &h);
		break;

	default:
		e = formatBadParameters;
	}

	*result = e;

	ExitCodeResource();
}

/* estimate the largest total of memory allocations we might need */
long prepare(long maxData){
	//maxData /= 2; // take half of available, up to MAX_MEM
	//return maxData < MAX_MEM ? maxData : MAX_MEM;
	return 128L<<10; // nominal
}

void putrevertinfo(FormatRecordPtr pb, struct revertinfo *p){
	/* when plugin entered for the first time for this document,
	 * pb->revertInfo should be NULL */
	Handle h = pb->revertInfo ? pb->revertInfo : (pb->hostNewHdl)(sizeof(struct revertinfo));
	if(h){
		*((struct revertinfo*)*h) = *p;
		pb->revertInfo = h;
	}
}

int getrevertinfo(FormatRecordPtr pb, struct revertinfo *p){
	if(pb->revertInfo){
		*p = *((struct revertinfo*)*pb->revertInfo);
		return 1;
	}
	return 0;
}