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73 lines
1.6 KiB
73 lines
1.6 KiB
// Copyright © 2023 OpenIM open source community. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !js
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package file
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import (
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"bufio"
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"io"
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"os"
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)
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const readBufferSize = 1024 * 1024 * 5 // 5mb
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func Open(req *UploadFileReq) (ReadFile, error) {
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file, err := os.Open(req.Filepath)
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if err != nil {
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return nil, err
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}
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info, err := file.Stat()
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if err != nil {
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_ = file.Close()
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return nil, err
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}
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df := &defaultFile{
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file: file,
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info: info,
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}
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df.resetReaderBuffer()
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return df, nil
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}
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type defaultFile struct {
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file *os.File
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info os.FileInfo
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reader io.Reader
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}
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func (d *defaultFile) resetReaderBuffer() {
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d.reader = bufio.NewReaderSize(d.file, readBufferSize)
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}
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func (d *defaultFile) Read(p []byte) (n int, err error) {
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return d.reader.Read(p)
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}
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func (d *defaultFile) Close() error {
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return d.file.Close()
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}
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func (d *defaultFile) StartSeek(whence int) error {
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if _, err := d.file.Seek(io.SeekStart, whence); err != nil {
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return err
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}
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d.resetReaderBuffer()
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return nil
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}
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func (d *defaultFile) Size() int64 {
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return d.info.Size()
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}
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