/*

PrintJobReader

Copyright (c) 2002 Haiku.

Author:
	Michael Pfeiffer

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

*/

#include "PrintJobReader.h"


#include <stdio.h>


#include <Picture.h>
#include <PrintJob.h>


// #pragma mark --- PrintJobPage


PrintJobPage::PrintJobPage()
	: fNextPicture(-1)
	, fNumberOfPictures(0)
	, fPicture(0)
	, fStatus(B_ERROR)
{
}


PrintJobPage::PrintJobPage(const PrintJobPage& copy)
	: fJobFile(copy.fJobFile)
	, fNextPicture(copy.fNextPicture)
	, fNumberOfPictures(copy.fNumberOfPictures)
	, fPicture(copy.fPicture)
	, fStatus(copy.fStatus)
{
}


PrintJobPage& PrintJobPage::operator=(const PrintJobPage& copy)
{
	if (this != &copy) {
		fJobFile = copy.fJobFile;
		fNextPicture = copy.fNextPicture;
		fNumberOfPictures = copy.fNumberOfPictures;
		fPicture = copy.fPicture;
		fStatus = copy.fStatus;
	}
	return *this;
}


PrintJobPage::PrintJobPage(BFile* jobFile, off_t start)
	: fJobFile(*jobFile)
	, fPicture(0)
	, fStatus(B_ERROR)
{
	off_t size;
	if (fJobFile.GetSize(&size) != B_OK || start > size)
		return;

	if (fJobFile.Seek(start, SEEK_SET) != start)
		return;

	if (fJobFile.Read(&fNumberOfPictures, sizeof(int32)) == sizeof(int32)) {
		// (sizeof(int32) * 10) == padding in _page_header_
		fJobFile.Seek(sizeof(off_t) + sizeof(int32) * 10, SEEK_CUR);
		fNextPicture = fJobFile.Position();
		fStatus = B_OK;
	}
}


status_t PrintJobPage::InitCheck() const
{
	return fStatus;
}


status_t PrintJobPage::NextPicture(BPicture& picture, BPoint& point, BRect& rect)
{
	if (fPicture >= fNumberOfPictures)
		return B_ERROR;
	fPicture++;

	fJobFile.Seek(fNextPicture, SEEK_SET);
	fJobFile.Read(&point, sizeof(BPoint));
	fJobFile.Read(&rect, sizeof(BRect));
	status_t rc = picture.Unflatten(&fJobFile);
	fNextPicture = fJobFile.Position();

	if (rc != B_OK)
		fPicture = fNumberOfPictures;

	return rc;
}


// # pragma mark --- PrintJobReader


PrintJobReader::PrintJobReader(BFile* jobFile)
	: fJobFile(*jobFile)
	, fNumberOfPages(-1)
	, fPageIndex(NULL)
{
	print_file_header header;
	fJobFile.Seek(0, SEEK_SET);
	if (fJobFile.Read(&header, sizeof(header)) == sizeof(header)) {
		if (fJobSettings.Unflatten(&fJobFile) == B_OK) {
			fNumberOfPages = header.page_count;
			fPageIndex = new off_t[fNumberOfPages];

			_BuildPageIndex();
		}
	}
}


PrintJobReader::~PrintJobReader()
{
	delete[] fPageIndex;
}


status_t PrintJobReader::InitCheck() const
{
	return fNumberOfPages > 0 ? B_OK : B_ERROR;
}


void PrintJobReader::_BuildPageIndex()
{
	off_t next_page;
	int32 number_of_pictures;
	for (int32 page = 0; page < fNumberOfPages; ++page) {
		fPageIndex[page] = fJobFile.Position();
		if (fJobFile.Read(&number_of_pictures, sizeof(int32)) == sizeof(int32)
			&& fJobFile.Read(&next_page, sizeof(off_t)) == sizeof(off_t)
			&& fPageIndex[page] < next_page) {
			fJobFile.Seek(next_page, SEEK_SET);
		} else {
			fNumberOfPages = 0;
			delete[] fPageIndex;
			fPageIndex = NULL;
			return;
		}
	}
}


status_t PrintJobReader::GetPage(int32 page, PrintJobPage& pjp)
{
	if (0 <= page && page < fNumberOfPages) {
		PrintJobPage p(&fJobFile, fPageIndex[page]);
		if (p.InitCheck() == B_OK) {
			pjp = p;
			return B_OK;
		}
	}
	return B_ERROR;
}


int32 PrintJobReader::FirstPage() const
{
	int32 firstPage = -1;
	fJobSettings.FindInt32("first_page", &firstPage);
	return firstPage;
}


int32 PrintJobReader::LastPage() const
{
	int32 lastPage = -1;
	fJobSettings.FindInt32("last_page", &lastPage);
	return lastPage;
}


BRect PrintJobReader::PaperRect() const
{
	BRect r;
	fJobSettings.FindRect("paper_rect", &r);
	return r;
}


BRect PrintJobReader::PrintableRect() const
{
	BRect r;
	fJobSettings.FindRect("printable_rect", &r);
	return r;
}


void PrintJobReader::GetResolution(int32 *xdpi, int32 *ydpi) const
{
	fJobSettings.FindInt32("xres", xdpi);
	fJobSettings.FindInt32("yres", ydpi);
}


float PrintJobReader::GetScale() const
{
	float scale = 1.0;
	fJobSettings.FindFloat("scale", &scale);
	return scale;
}