blob: f59a5d6656bc3bb3d629b3a4f3167cd77fb59943 (
plain) (
blame)
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
|
package index
import (
"io"
"path/filepath"
)
// TODO: create excluded path filter factory
type DocFilter func(infoPath, io.ReadSeeker) bool
func NewExtensionFilter(ext string) DocFilter {
return func(ip infoPath, _ io.ReadSeeker) bool {
return filepath.Ext(ip.path) == ext
}
}
func NewMaxFilesizeFilter(size int64) DocFilter {
return func(ip infoPath, _ io.ReadSeeker) bool {
return ip.info.Size() <= size
}
}
func YamlHeaderFilter(_ infoPath, r io.ReadSeeker) bool {
const bufSize = 4096
buf := make([]byte, bufSize)
carry := make([]byte, 4)
cmp := make([]byte, 4)
n, err := r.Read(carry)
if err != nil || n < 4 || string(carry) != "---\n" {
return false
}
headerFound := false
readMore := true
for readMore {
buf = buf[:bufSize]
n, err := r.Read(buf)
if err == io.EOF {
readMore = false
} else if err != nil {
return false
}
buf = buf[:n]
// PERF: the carry doesn't need to be checked on the first loop iteration
for i := range min(4, n) {
b := carry[i]
for j := range 4 {
if i+j < 4 {
cmp[j] = carry[i+j]
} else {
cmp[j] = buf[(i+j)%4]
}
}
if b == '\n' && string(cmp) == "\n---\n" {
headerFound = true
readMore = false
break
}
}
for i := range n - 4 {
b := buf[i]
if b == '\n' && string(buf[i:i+5]) == "\n---\n" {
headerFound = true
readMore = false
break
}
}
if readMore {
for i := range 4 {
carry[i] = buf[n-4+i]
}
}
}
return headerFound
}
func DefaultFilters() []DocFilter {
return []DocFilter{NewExtensionFilter(".md"), NewMaxFilesizeFilter(200 * 1024)}
}
|
