Move files from gousb/usb to gousb

misc.go

@@ -0,0 +1,57 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+// Copyright 2016 the gousb Authors.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gousb
+
+import (
+	"fmt"
+)
+
+// BCD is a binary-coded decimal version number, with first 8 bits representing
+// the major version number, an latter 8 bits the minor version number.
+// Major and minor are composed of 4+4 bits, where each 4 bits represents
+// a decimal digit.
+// Example: BCD(0x1234) means major 12 (decimal) and minor 34 (decimal).
+type BCD uint16
+
+// Major is the major number of the BCD.
+func (s BCD) Major() uint8 {
+	maj := uint8(s >> 8)
+	return 10*(maj>>4) + maj&0x0f
+}
+
+// Minor is the minor number of the BCD.
+func (s BCD) Minor() uint8 {
+	min := uint8(s & 0xff)
+	return 10*(min>>4) + min&0x0f
+}
+
+// String returns a dotted representation of the BCD (major.minor).
+func (s BCD) String() string {
+	return fmt.Sprintf("%d.%02d", s.Major(), s.Minor())
+}
+
+// Version returns a BCD version number with given major/minor.
+func Version(major, minor uint8) BCD {
+	return (BCD(major)/10)<<12 | (BCD(major)%10)<<8 | (BCD(minor)/10)<<4 | BCD(minor)%10
+}
+
+// ID represents a vendor or product ID.
+type ID uint16
+
+// String returns a hexadecimal ID.
+func (id ID) String() string {
+	return fmt.Sprintf("%04x", int(id))
+}