/*
 * Extract pages as separate PDFs from a PDF file on Mac OS X
 * See http://gidden.net/tom/2009/01/27/extract-pdf-pages/
 *
 * Copyright 2009 Tom Gidden <tom@gidden.net>
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

#import <ApplicationServices/ApplicationServices.h>

int main (int argc, const char * argv[])
{
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

	// Get the document's URL.  I've been lazy here and just used the last arg.
	// Other args are ignored.
	NSString *path = [NSString stringWithCString:argv[--argc]];
	NSURL *url = [NSURL fileURLWithPath:path];

	// Get the original document
	CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFURLRef)url);

	// How many pages does it have?
	int pages = CGPDFDocumentGetNumberOfPages(document);

	// For each page:
	for(size_t pagenum=1; pagenum<=pages; pagenum++) {

		// Get the page as an object
		CGPDFPageRef page = CGPDFDocumentGetPage(document, pagenum);

		// Create a filename for the new PDF file.
		NSString *npath = [NSString stringWithFormat:@"./%04d.pdf", pagenum];
		NSURL *nurl = [NSURL fileURLWithPath:npath];

		// Get the page bounding area.  Not sure if this is the right one, but it'll
		// do for my purposes
		CGRect pageRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);

		// Create a new graphics context to paint the page into, using the new URL
		// to store it in
		CGContextRef newContext = CGPDFContextCreateWithURL ((CFURLRef)nurl, &pageRect, nil);

		// Draw the page from the original document into this new context.
		CGContextBeginPage(newContext, &pageRect);
		CGContextDrawPDFPage(newContext, page);
		CGContextEndPage(newContext);

		// Finish up.
		CGContextRelease(newContext);
	}

	[pool drain];
	return 0;
}