Initial commit after restructure

formats/varint/helpers.go

@@ -0,0 +1,22 @@
+package varint
+
+import "errors"
+
+// PrependLength prepends the varint encoded length of the byte slice to itself.
+func PrependLength(data []byte) []byte {
+	return append(Pack64(uint64(len(data))), data...)
+}
+
+// GetNextBlock extract the integer from the beginning of the given byte slice and returns the remaining bytes, the extracted integer, and whether there was an error.
+func GetNextBlock(data []byte) ([]byte, int, error) {
+	l, n, err := Unpack64(data)
+	if err != nil {
+		return nil, 0, err
+	}
+	length := int(l)
+	totalLength := length + n
+	if totalLength > len(data) {
+		return nil, 0, errors.New("varint: not enough data for given block length")
+	}
+	return data[n:totalLength], totalLength, nil
+}