pkg: hide it by moving to _pkg.dev

The idea here is to preserve the history of `dev` branch development and its
code when merging with the `master`. Later this code could be moved into the
masters code where appropriate.

_pkg.dev/wire/util/binaryReader.go

@@ -0,0 +1,71 @@
+package util
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+//BinReader is a convenient wrapper around a io.Reader and err object
+// Used to simplify error handling when reading into a struct with many fields
+type BinReader struct {
+	R   io.Reader
+	Err error
+}
+
+// Read reads from the underlying io.Reader
+// into the interface v in LE
+func (r *BinReader) Read(v interface{}) {
+	if r.Err != nil {
+		return
+	}
+	r.Err = binary.Read(r.R, binary.LittleEndian, v)
+}
+
+// ReadBigEnd reads from the underlying io.Reader
+// into the interface v in BE
+func (r *BinReader) ReadBigEnd(v interface{}) {
+	if r.Err != nil {
+		return
+	}
+	r.Err = binary.Read(r.R, binary.BigEndian, v)
+}
+
+//VarUint reads a variable integer from the
+// underlying reader
+func (r *BinReader) VarUint() uint64 {
+	var b uint8
+	r.Err = binary.Read(r.R, binary.LittleEndian, &b)
+
+	if b == 0xfd {
+		var v uint16
+		r.Err = binary.Read(r.R, binary.LittleEndian, &v)
+		return uint64(v)
+	}
+	if b == 0xfe {
+		var v uint32
+		r.Err = binary.Read(r.R, binary.LittleEndian, &v)
+		return uint64(v)
+	}
+	if b == 0xff {
+		var v uint64
+		r.Err = binary.Read(r.R, binary.LittleEndian, &v)
+		return v
+	}
+
+	return uint64(b)
+}
+
+// VarBytes reads the next set of bytes from the underlying reader.
+// VarUInt is used to determine how large that slice is
+func (r *BinReader) VarBytes() []byte {
+	n := r.VarUint()
+	b := make([]byte, n)
+	r.Read(b)
+	return b
+}
+
+// VarString calls VarBytes and casts the results as a string
+func (r *BinReader) VarString() string {
+	b := r.VarBytes()
+	return string(b)
+}