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111 lines
2.2 KiB
111 lines
2.2 KiB
// Copyright © 2023 OpenIM. 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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package pkg
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import (
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"bytes"
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"io"
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"os"
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)
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type ReadSeekSizeCloser interface {
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io.ReadSeekCloser
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Size() int64
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}
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func NewReader(r io.Reader, max int64, path string) (ReadSeekSizeCloser, error) {
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buf := make([]byte, max+1)
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n, err := io.ReadFull(r, buf)
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if err == nil {
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f, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0o666)
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if err != nil {
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return nil, err
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}
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var ok bool
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defer func() {
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if !ok {
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_ = f.Close()
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_ = os.Remove(path)
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}
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}()
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if _, err := f.Write(buf[:n]); err != nil {
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return nil, err
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}
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cn, err := io.Copy(f, r)
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if err != nil {
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return nil, err
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}
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if _, err := f.Seek(0, io.SeekStart); err != nil {
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return nil, err
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}
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ok = true
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return &fileBuffer{
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f: f,
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n: cn + int64(n),
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}, nil
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} else if err == io.EOF || err == io.ErrUnexpectedEOF {
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return &memoryBuffer{
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r: bytes.NewReader(buf[:n]),
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}, nil
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} else {
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return nil, err
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}
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}
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type fileBuffer struct {
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n int64
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f *os.File
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}
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func (r *fileBuffer) Read(p []byte) (n int, err error) {
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return r.f.Read(p)
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}
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func (r *fileBuffer) Seek(offset int64, whence int) (int64, error) {
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return r.f.Seek(offset, whence)
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}
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func (r *fileBuffer) Size() int64 {
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return r.n
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}
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func (r *fileBuffer) Close() error {
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name := r.f.Name()
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if err := r.f.Close(); err != nil {
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return err
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}
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return os.Remove(name)
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}
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type memoryBuffer struct {
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r *bytes.Reader
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}
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func (r *memoryBuffer) Read(p []byte) (n int, err error) {
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return r.r.Read(p)
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}
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func (r *memoryBuffer) Seek(offset int64, whence int) (int64, error) {
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return r.r.Seek(offset, whence)
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}
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func (r *memoryBuffer) Close() error {
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return nil
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}
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func (r *memoryBuffer) Size() int64 {
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return r.r.Size()
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}
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