moved scanner sources to package 'scan'

util/byte-slider.go

@@ -0,0 +1,34 @@
+// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
+// All rights reserved.
+
+// byte-slider.go
+package util
+
+import "bytes"
+
+type ByteSlider struct {
+	buf    []byte
+	length int
+}
+
+func NewByteSlider(size int) *ByteSlider {
+	return &ByteSlider{
+		buf:    make([]byte, max(1, size)),
+		length: 0,
+	}
+}
+
+func (slider *ByteSlider) PushEnd(b byte) {
+	if slider.length == cap(slider.buf) {
+		slider.length--
+		for i := 0; i < slider.length; i++ {
+			slider.buf[i] = slider.buf[i+1]
+		}
+	}
+	slider.buf[slider.length] = b
+	slider.length++
+}
+
+func (slider *ByteSlider) Equal(target []byte) bool {
+	return target != nil && bytes.Equal(slider.buf, target)
+}