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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
package btf
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
)
type stringTable struct {
base *stringTable
offsets []uint32
strings []string
}
// sizedReader is implemented by bytes.Reader, io.SectionReader, strings.Reader, etc.
type sizedReader interface {
io.Reader
Size() int64
}
func readStringTable(r sizedReader, base *stringTable) (*stringTable, error) {
// When parsing split BTF's string table, the first entry offset is derived
// from the last entry offset of the base BTF.
firstStringOffset := uint32(0)
if base != nil {
idx := len(base.offsets) - 1
firstStringOffset = base.offsets[idx] + uint32(len(base.strings[idx])) + 1
}
// Derived from vmlinux BTF.
const averageStringLength = 16
n := int(r.Size() / averageStringLength)
offsets := make([]uint32, 0, n)
strings := make([]string, 0, n)
offset := firstStringOffset
scanner := bufio.NewScanner(r)
scanner.Split(splitNull)
for scanner.Scan() {
str := scanner.Text()
offsets = append(offsets, offset)
strings = append(strings, str)
offset += uint32(len(str)) + 1
}
if err := scanner.Err(); err != nil {
return nil, err
}
if len(strings) == 0 {
return nil, errors.New("string table is empty")
}
if firstStringOffset == 0 && strings[0] != "" {
return nil, errors.New("first item in string table is non-empty")
}
return &stringTable{base, offsets, strings}, nil
}
func splitNull(data []byte, atEOF bool) (advance int, token []byte, err error) {
i := bytes.IndexByte(data, 0)
if i == -1 {
if atEOF && len(data) > 0 {
return 0, nil, errors.New("string table isn't null terminated")
}
return 0, nil, nil
}
return i + 1, data[:i], nil
}
func (st *stringTable) Lookup(offset uint32) (string, error) {
if st.base != nil && offset <= st.base.offsets[len(st.base.offsets)-1] {
return st.base.lookup(offset)
}
return st.lookup(offset)
}
func (st *stringTable) lookup(offset uint32) (string, error) {
i := search(st.offsets, offset)
if i == len(st.offsets) || st.offsets[i] != offset {
return "", fmt.Errorf("offset %d isn't start of a string", offset)
}
return st.strings[i], nil
}
func (st *stringTable) Length() int {
last := len(st.offsets) - 1
return int(st.offsets[last]) + len(st.strings[last]) + 1
}
func (st *stringTable) Marshal(w io.Writer) error {
for _, str := range st.strings {
_, err := io.WriteString(w, str)
if err != nil {
return err
}
_, err = w.Write([]byte{0})
if err != nil {
return err
}
}
return nil
}
// search is a copy of sort.Search specialised for uint32.
//
// Licensed under https://go.dev/LICENSE
func search(ints []uint32, needle uint32) int {
// Define f(-1) == false and f(n) == true.
// Invariant: f(i-1) == false, f(j) == true.
i, j := 0, len(ints)
for i < j {
h := int(uint(i+j) >> 1) // avoid overflow when computing h
// i ≤ h < j
if !(ints[h] >= needle) {
i = h + 1 // preserves f(i-1) == false
} else {
j = h // preserves f(j) == true
}
}
// i == j, f(i-1) == false, and f(j) (= f(i)) == true => answer is i.
return i
}
|
