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 gousb
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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. Its first 8 bits represent
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// the major version number, its last 8 bits represent 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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