56162d0105
- I don't expect them to get much use, and reuse of BCD for USB spec version and device revision makes it somewhat confusing.
58 lines
1.8 KiB
Go
58 lines
1.8 KiB
Go
// Copyright 2013 Google Inc. All rights reserved.
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// Copyright 2016 the gousb Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package usb
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import (
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"fmt"
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)
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// BCD is a binary-coded decimal version number, with first 8 bits representing
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// the major version number, an latter 8 bits the minor version number.
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// Major and minor are composed of 4+4 bits, where each 4 bits represents
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// a decimal digit.
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// Example: BCD(0x1234) means major 12 (decimal) and minor 34 (decimal).
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type BCD uint16
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// Major is the major number of the BCD.
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func (s BCD) Major() uint8 {
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maj := uint8(s >> 8)
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return 10*(maj>>4) + maj&0x0f
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}
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// Minor is the minor number of the BCD.
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func (s BCD) Minor() uint8 {
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min := uint8(s & 0xff)
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return 10*(min>>4) + min&0x0f
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}
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// String returns a dotted representation of the BCD (major.minor).
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func (s BCD) String() string {
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return fmt.Sprintf("%d.%02d", s.Major(), s.Minor())
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}
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// Version returns a BCD version number with given major/minor.
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func Version(major, minor uint8) BCD {
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return (BCD(major)/10)<<12 | (BCD(major)%10)<<8 | (BCD(minor)/10)<<4 | BCD(minor)%10
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}
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// ID represents a vendor or product ID.
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type ID uint16
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// String returns a hexadecimal ID.
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func (id ID) String() string {
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return fmt.Sprintf("%04x", int(id))
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}
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