#include "tag.h"

void
usage(void)
{
	fprint(2, "usage: %s [file]\n", argv0);
	exits("usage");
}

void
main(int argc, char **argv)
{
	int fd;
	Biobuf bin;
	uchar buf[1024], *p;
	Header hdr;
	Rechdr rhdr;

	ARGBEGIN {
	default:
		usage();
	} ARGEND

	switch(argc) {
	case 0:
		fd = 0;
		break;
	case 1:
		if((fd = open(argv[0], OREAD)) < 0)
			sysfatal("open %s: %r", argv[0]);
		break;
	default:
		usage();
		SET(fd);
	}

	Binit(&bin, fd, OREAD);

	readrec(&bin, buf, sizeof buf, HeaderSize, "header");
	p = buf;

	gheader(&p, &hdr);
	if(strcmp(hdr.magic, "ID3") != 0)
		sysfatal("bad magic");
	print("%d\n", HeaderSize + hdr.length);
	print("%s	2.%d.%d	%.8b	%d\n", hdr.magic, hdr.version, hdr.revision, hdr.flags, hdr.length);

	while(Boffset(&bin) < HeaderSize + hdr.length) {
		readrec(&bin, buf, sizeof buf, hdr.version == 2 ? 6 : RecHdrSize, "rhdr");	// FIXME
		p = buf;

		grechdr(&p, &rhdr, &hdr);
		if(strcmp(rhdr.id, "") == 0) {
			print("padding	%ulld\n",
				(HeaderSize+hdr.length) - (Boffset(&bin) - (hdr.version == 2 ? 6 : RecHdrSize)));	// FIXME
			break;
		}
		print("%s	%d	%.8b %.8b\n", rhdr.id, rhdr.length, rhdr.flags >> 8, rhdr.flags & 0xff);
		if(Bseek(&bin, rhdr.length, 1) < 0)
			sysfatal("seek: %r");
	}

	exits(nil);
}