//
//  umx.mm
//  Dumb Unreal Archive parser
//
//  Created by Christopher Snowhill on 10/4/13.
//  Copyright 2013 __NoWork, Inc__. All rights reserved.
//

#include "umr.h"

#include "umx.h"

class umr_mem_reader : public umr::file_reader {
	const void *ptr;
	long offset, size;

	public:
	umr_mem_reader(const void *buf, unsigned p_size)
	: ptr(buf), size(p_size), offset(0) {
	}

	long read(void *buf, long howmany) {
		long max = size - offset;
		if(max > howmany) max = howmany;
		if(max) {
			memcpy(buf, (const uint8_t *)ptr + offset, max);
			offset += max;
		}
		return max;
	}

	void seek(long where) {
		if(where > size)
			offset = size;
		else
			offset = where;
	}
};

void *unpackUmx(const void *in, long *size) {
	umr_mem_reader memreader(in, (unsigned int)*size);
	umr::upkg pkg;
	if(pkg.open(&memreader)) {
		for(int i = 1, j = pkg.ocount(); i <= j; i++) {
			char *classname = pkg.oclassname(i);
			if(classname && !strcmp(pkg.oclassname(i), "Music")) {
				char *type = pkg.otype(i);
				if(!type || !strcasecmp(type, "it") || !strcasecmp(type, "s3m") || !strcasecmp(type, "xm")) {
					*size = pkg.object_size(i);
					void *ret = malloc(*size);
					memcpy(ret, (const uint8_t *)in + pkg.object_offset(i), *size);
					return ret;
				}
			}
		}
	}

	return NULL;
}