tape: Improve table decoding

tape/table.go

@@ -1,27 +1,24 @@
 package tape
 
-import "iter"
-
 // encoding and decoding functions must not make any allocations
 
 type TablePushFunc func(tag uint16, value []byte) (n int, err error)
 
-func DecodeTable(data []byte) iter.Seq2[uint16, []byte] {
+type TablePullFunc func() (tag uint16, value []byte, n int, err error)
-	return func(yield func(tag uint16, value []byte) bool) {
-		n := 0
-		for {
-			tag, nn, err := DecodeI16[uint16](data[n:])
-			if err != nil { return }
-			n += nn
 
-			length, nn, err := DecodeGBEU[uint64](data[n:])
+func DecodeTable(data []byte) TablePullFunc {
-			if err != nil { return }
+	return func() (tag uint16, value []byte, n int, err error) {
-			n += nn
+		tag, nn, err := DecodeI16[uint16](data[n:])
+		if err != nil { return tag, value, n, err }
+		n += nn
 
-			value := data[n:n + int(length)]
+		length, nn, err := DecodeGBEU[uint64](data[n:])
-			yield(tag, value)
+		if err != nil { return tag, value, n, err }
-			n += int(length)
+		n += nn
-		}
+
+		value = data[n:n + int(length)]
+		n += int(length)
+		return tag, value, n, err
 	}
 }