/
biospath.go
87 lines (70 loc) · 2.12 KB
/
biospath.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
// Copyright (c) 2022 Arthur Skowronek <0x5a17ed@tuta.io> and contributors
//
// 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
//
// <https://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 efidevicepath
import (
"fmt"
"io"
"github.com/0x5a17ed/uefi/efi/efireader"
)
const (
_ DevicePathSubType = iota
BIOSBootSpecSubType
)
// BIOSBootSpecPath is used to describe the booting of non-EFI-aware operating systems.
//
// <https://uefi.org/specs/UEFI/2.9_A/10_Protocols_Device_Path_Protocol.html#bios-boot-specification-device-path-1>
type BIOSBootSpecPath struct {
Head
// DeviceType specifies an identification number that
// describes what type of device this is as defined by the
// BIOS Boot Specification.
DeviceType uint16
// StatusFlag as defined by the BIOS Boot Specification.
StatusFlag uint16
// Description is a zero-terminated string that describes
// this device to a user.
Description []byte
}
func (p *BIOSBootSpecPath) GetHead() *Head {
return &p.Head
}
func (p *BIOSBootSpecPath) Text() string {
return fmt.Sprintf(
"BBS(%d,%s,%x)",
p.DeviceType,
formatString(efireader.ASCIIZBytesToString(p.Description)),
p.StatusFlag,
)
}
func (p *BIOSBootSpecPath) ReadFrom(r io.Reader) (n int64, err error) {
fr := efireader.NewFieldReader(r, &n)
err = fr.ReadFields(&p.DeviceType, &p.StatusFlag)
if err != nil {
return
}
p.Description, err = efireader.ReadASCIINullBytes(fr)
return
}
func ParseBIOSDevicePath(f io.Reader, h Head) (p DevicePath, err error) {
switch h.SubType {
case BIOSBootSpecSubType:
p = &BIOSBootSpecPath{Head: h}
default:
p = &UnrecognizedDevicePath{Head: h}
}
if _, err := p.ReadFrom(f); err != nil {
return nil, err
}
return
}