blob: 67a538ba09079856cf567cd37456a5cc0948238b (
plain)
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
|
// Copyright 2019 The gVisor Authors.
//
// 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
//
// http://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 ext
import (
"io"
)
// inlineFile is a type of regular file. All the data here is stored in the
// inode.Data() array.
type inlineFile struct {
regFile regularFile
}
// Compiles only if inlineFile implements io.ReaderAt.
var _ io.ReaderAt = (*inlineFile)(nil)
// newInlineFile is the inlineFile constructor.
func newInlineFile(regFile regularFile) *inlineFile {
file := &inlineFile{regFile: regFile}
file.regFile.impl = file
return file
}
// ReadAt implements io.ReaderAt.ReadAt.
func (f *inlineFile) ReadAt(dst []byte, off int64) (int, error) {
if len(dst) == 0 {
return 0, nil
}
size := f.regFile.inode.diskInode.Size()
if uint64(off) >= size {
return 0, io.EOF
}
to := uint64(off) + uint64(len(dst))
if to > size {
to = size
}
n := copy(dst, f.regFile.inode.diskInode.Data()[off:to])
return n, nil
}
|
