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

static	unsigned char	buf[655360];

static	int	compressed_size;
static	int	original_size;
static	int	fname_size;
static	unsigned char	fname[256];
static	int	id;
static	int	header_size;
static	unsigned char	header[256];
static	unsigned char	compressed_data[65536];

static	void	dump(unsigned char *p, int len)
{
	int	i;

	for (i = 0; i < len; i++) {
		printf("%02x ", *p++);
		if (!((i + 1) % 16)) printf("\n");
	}
	printf("\n");
}


static	void	analyze(int size)
{
	int	pos = 0;

	while (pos < size) {
		printf("pos:%#x ", pos);

		compressed_size = buf[pos] | (buf[pos + 1] << 8) |
			(buf[pos + 2] << 16) | (buf[pos + 3] << 24);
		pos += 4;

		if (!compressed_size) {
			printf("no more data\n");
			break;
		}

		original_size = buf[pos] | (buf[pos + 1] << 8) |
			(buf[pos + 2] << 16) | (buf[pos + 3] << 24);
		pos += 4;

		fname_size = buf[pos] | (buf[pos + 1] << 8);
		pos += 2;

		memset(fname, 0, sizeof(fname));
		memcpy(fname, &buf[pos], fname_size);
		pos += fname_size;

		id = buf[pos] | (buf[pos + 1] << 8) |
			(buf[pos + 2] << 16) | (buf[pos + 3] << 24);
		pos += 4;

		header_size = buf[pos] | (buf[pos + 1] << 8);
		pos += 2;

		memset(header, 0, sizeof(header));
		memcpy(header, &buf[pos], header_size);
		pos += header_size;


		memset(compressed_data, 0, sizeof(compressed_data));
		memcpy(compressed_data, &buf[pos], compressed_size);
		pos += compressed_size;

		printf("compressed_size:%d ", compressed_size);
		printf("orignal_size:%d\n", original_size);
		printf("fname_size:%d [%s] ", fname_size, fname);
		printf("id:%#x ", id);
		printf("header_size:%d\n", header_size);
		dump(header, header_size);
		printf("compressed_data:\n");
		dump(compressed_data, compressed_size);
	}
}


int	main(int argc, char *argv[])
{
	FILE	*fp;
	int	result, size;

	fp = fopen("MUSIC.ncl", "rb");
	if (fp == NULL) {
		printf("file open error\n");
		result = EXIT_FAILURE;
		goto fin0;
	}

	size = fread(buf, 1, sizeof(buf), fp);
	printf("size %d bytes\n", size);

	analyze(size);

 fin1:
	fclose(fp);
 fin0:
	return result;
}