/*
	exhal - HAL Laboratory decompression tool
	
	Usage:
	exhal romfile offset outfile

	Copyright (c) 2013 Devin Acker

	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 <stdio.h>
#include <stdlib.h>
#include "compress.h"

int main (int argc, char **argv) {
	printf("exhal - " __DATE__ " " __TIME__"\nby Devin Acker (Revenant)\n\n");
	
	if (argc != 4) {
		fprintf(stderr, "Usage:\n%s romfile offset outfile\n"
		                "Example: %s kirbybowl.sfc 0x70000 test.bin\n\n"
		                "offset can be in either decimal or hex.\n",
		                argv[0], argv[0]);
		exit(-1);
	}
	
	FILE   *infile, *outfile;
	
	// open ROM file for input
	infile = fopen(argv[1], "rb");
	if (!infile) {
		fprintf(stderr, "Error: unable to open %s\n", argv[1]);
		exit(-1);
	}
	
	// open target file for output
	outfile = fopen(argv[3], "wb");
	if (!outfile) {
		fprintf(stderr, "Error: unable to open %s\n", argv[3]);
		exit(-1);
	}
	
	size_t   outputsize, fileoffset;
	uint8_t  unpacked[DATA_SIZE] = {0};
	
	fileoffset = strtol(argv[2], NULL, 0);
	
	// decompress the file
	fseek(infile, 0, SEEK_END);
	if (fileoffset < ftell(infile)) {
		outputsize = unpack_from_file(infile, fileoffset, unpacked);
	} else {
		fprintf(stderr, "Error: Unable to decompress %s because an invalid offset was specified\n"
		                "       (must be between zero and 0x%X).\n", argv[1], ftell(infile));
		exit(-1);
	}
	
	if (outputsize) {
		// write the uncompressed data to the file
		fseek(outfile, 0, SEEK_SET);
		fwrite((const void*)unpacked, 1, outputsize, outfile);
		if (ferror(outfile)) {
			perror("Error writing output file");
			exit(-1);
		}
		
		printf("Uncompressed size: %zu bytes\n", outputsize);
	} else {
		fprintf(stderr, "Error: Unable to decompress %s because the output would have been larger than\n"
		                "       64 kb. The input at 0x%X is likely not valid compressed data.\n", argv[1], fileoffset);
	}
	
	fclose(infile);
	fclose(outfile);
}