init

internal/ioutilx/byte.go

@@ -0,0 +1,24 @@
+// Package ioutilx implements extended input/output utility functions.
+package ioutilx
+
+import (
+	"io"
+)
+
+// ReadByte reads and returns the next byte from r.
+func ReadByte(r io.Reader) (byte, error) {
+	var buf [1]byte
+	if _, err := io.ReadFull(r, buf[:]); err != nil {
+		return 0, err
+	}
+	return buf[0], nil
+}
+
+// WriteByte writes the given byte to w.
+func WriteByte(w io.Writer, b byte) error {
+	buf := [1]byte{b}
+	if _, err := w.Write(buf[:]); err != nil {
+		return err
+	}
+	return nil
+}

internal/ioutilx/zero.go

@@ -0,0 +1,17 @@
+package ioutilx
+
+// Zero is an io.Reader which always reads zero bytes.
+var Zero zero
+
+// zero is an io.Reader which always reads zero bytes.
+type zero struct {
+}
+
+// Read reads len(b) zero bytes into b. It returns the number of bytes read and
+// a nil error value.
+func (zero) Read(b []byte) (n int, err error) {
+	for i := range b {
+		b[i] = 0
+	}
+	return len(b), nil
+}