midi: replace d.BytesLen(1) with d.U8()

Author: twystd

format/midi/midi.go

@@ -175,12 +175,12 @@ func vlq(d *decode.D) uint64 {
 	vlq := uint64(0)
 
 	for {
-		b := d.BytesLen(1)
+		b := d.U8()
 
 		vlq <<= 7
-		vlq += uint64(b[0] & 0x7f)
+		vlq += uint64(b & 0x7f)
 
-		if b[0]&0x80 == 0 {
+		if b&0x80 == 0 {
 			break
 		}
 	}

format/midi/midievents.go

@@ -47,7 +47,7 @@ func decodeMIDIEvent(d *decode.D, status uint8, ctx *context) {
 	channel := func(d *decode.D) uint64 {
 		b := d.PeekBytes(1)
 		if b[0] >= 0x80 {
-			d.BytesLen(1)
+			d.U8()
 		}
 
 		return uint64(status & 0x0f)

format/midi/sysex.go

@@ -31,7 +31,7 @@ func decodeSysExEvent(d *decode.D, status uint8, ctx *context) {
 		d.FieldStruct("SysExMessage", func(d *decode.D) {
 			d.FieldStruct("time", delta)
 			d.FieldUintFn("event", func(d *decode.D) uint64 {
-				d.BytesLen(1)
+				d.U8()
 
 				return 0x00f0
 			}, sysex)
@@ -42,7 +42,7 @@ func decodeSysExEvent(d *decode.D, status uint8, ctx *context) {
 		d.FieldStruct("SysExContinuation", func(d *decode.D) {
 			d.FieldStruct("time", delta)
 			d.FieldUintFn("event", func(d *decode.D) uint64 {
-				d.BytesLen(1)
+				d.U8()
 
 				return 0x80f7
 			}, sysex)
@@ -53,7 +53,7 @@ func decodeSysExEvent(d *decode.D, status uint8, ctx *context) {
 		d.FieldStruct("SysExEscape", func(d *decode.D) {
 			d.FieldStruct("time", delta)
 			d.FieldUintFn("event", func(d *decode.D) uint64 {
-				d.BytesLen(1)
+				d.U8()
 
 				return 0x00f7
 			}, sysex)