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// 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 fileReader.
var _ fileReader = (*inlineFile)(nil)
// getFileReader implements fileReader.getFileReader.
func (f *inlineFile) getFileReader(_ io.ReadSeeker, _ uint64, offset uint64) io.Reader {
diskInode := f.regFile.inode.diskInode
return &inlineReader{offset: offset, data: diskInode.Data()[:diskInode.Size()]}
}
// newInlineFile is the inlineFile constructor.
func newInlineFile(regFile regularFile) *inlineFile {
file := &inlineFile{regFile: regFile}
file.regFile.impl = file
return file
}
// inlineReader implements io.Reader which can read the underlying data. This
// is not thread safe.
type inlineReader struct {
offset uint64
data []byte
}
// Compiles only if inlineReader implements io.Reader.
var _ io.Reader = (*inlineReader)(nil)
// Read implements io.Reader.Read.
func (r *inlineReader) Read(dst []byte) (int, error) {
if len(dst) == 0 {
return 0, nil
}
if int(r.offset) >= len(r.data) {
return 0, io.EOF
}
n := copy(dst, r.data[r.offset:])
r.offset += uint64(n)
return n, nil
}
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