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// Copyright 2016 Google Inc. All rights reserved.
//
// 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.
// +build !linux
package zoekt
import (
"fmt"
"os"
)
// NewIndexFile returns a new index file. The index file takes
// ownership of the passed in file, and may close it.
func NewIndexFile(f *os.File) (IndexFile, error) {
return &indexFileFromOS{f}, nil
}
type indexFileFromOS struct {
f *os.File
}
func (f *indexFileFromOS) Read(off, sz uint32) ([]byte, error) {
r := make([]byte, sz)
_, err := f.f.ReadAt(r, int64(off))
return r, err
}
func (f indexFileFromOS) Size() (uint32, error) {
fi, err := f.f.Stat()
if err != nil {
return 0, err
}
sz := fi.Size()
if sz >= maxUInt32 {
return 0, fmt.Errorf("overflow")
}
return uint32(sz), nil
}
func (f indexFileFromOS) Close() {
f.f.Close()
}
func (f indexFileFromOS) Name() string {
return f.f.Name()
}