#include <u.h>#include <libc.h>#include <bio.h> static intBu16le(Biobuf *b, u16int *o){	int x; 	x = Bgetc(b);	x |= Bgetc(b)<<8;	*o = x;	if(x < 0)		werrstr("failed to read 2 bytes"); 	return x < 0 ? -1 : 0;} static intBu32le(Biobuf *b, u32int *o){	int x, i; 	*o = 0;	for(i = 0; i < 4; *o |= x<<(i*8), i++){		if((x = Bgetc(b)) < 0){			werrstr("failed to read 4 bytes");			return -1;		}	} 	return 0;} static intBu64le(Biobuf *b, u64int *o){	int x, i; 	*o = 0;	for(i = 0; i < 8; *o |= (uvlong)x<<(i*8), i++){		if((x = Bgetc(b)) < 0){			werrstr("failed to read 8 bytes");			return -1;		}	} 	return 0;} static voidusage(void){	fprint(2, "usage: %s [-h hxsz] [file.ivf] >file.raw\n", argv0);	exits("usage");} voidmain(int argc, char **argv){	u64int timestamp, framenum;	int n, bufsz, hxsz, fd;	u32int tbnum, tbdenum;	u16int w, h, hlen;	Biobuf in, out;	char tmp[6];	u8int *buf;	u32int sz; 	hxsz = 0;	ARGBEGIN{	case 'h':		if((hxsz = atoi(EARGF(usage()))) > 0){			fmtinstall('H', encodefmt);			break;		}	default:		usage();	}ARGEND 	fd = 0;	if(argc == 1){		if((fd = open(*argv, OREAD)) < 0)			sysfatal("%r");	}else if(argc != 0)		usage(); 	Binit(&in, fd, OREAD);	Binit(&out, 1, OWRITE); 	if(Bread(&in, tmp, 6) != 6 || Bu16le(&in, &hlen) < 0)		sysfatal("header read failed");	if(memcmp(tmp, "DKIF", 4) != 0)		sysfatal("expected DKIF, got %02x%02x%02x%02x", tmp[0], tmp[1], tmp[2], tmp[3]);	if(hlen < 0x20 || Bread(&in, tmp, 4) != 4)		sysfatal("invalid header: hlen=%d", hlen);	if(Bu16le(&in, &w) < 0 || Bu16le(&in, &h) < 0 || Bu32le(&in, &tbdenum) < 0 || Bu32le(&in, &tbnum) < 0)		sysfatal("invalid header: %r");	if(Bseek(&in, hlen, 0) != hlen)		sysfatal("invalid IVF stream"); 	bufsz = 0;	buf = nil;	for(framenum = 0;; framenum++){		if(Bu32le(&in, &sz) < 0 || Bu64le(&in, &timestamp) < 0 || (int)sz < 0)			break;		if(bufsz < sz){			bufsz = sz;			if((buf = realloc(buf, bufsz)) == nil)				sysfatal("frame %llud is too big: %d bytes", framenum, bufsz);		}		if((n = Bread(&in, buf, sz)) != sz)			sysfatal("short read (%d < %d) at %lld", n, sz, Boffset(&in));		if(hxsz < 1)			Bwrite(&out, buf, sz);		else			Bprint(&out, "[%6llud %8llud %#7ux] %.*H\n", framenum, timestamp, sz, sz > hxsz ? hxsz : sz, buf);	} 	Bterm(&in);	Bterm(&out); 	exits(nil);}