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utils_io.go
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/
utils_io.go
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// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
package utils
import (
"io"
"io/ioutil"
)
// ReadCloser implements the io.ReadCloser interface
// which is used for reading request body content multiple times.
//
// Note that it cannot be closed.
type ReadCloser struct {
index int // Current read position.
content []byte // Content.
repeatable bool
}
// NewRepeatReadCloser creates and returns a RepeatReadCloser object.
func NewReadCloser(content []byte, repeatable bool) io.ReadCloser {
return &ReadCloser{
content: content,
repeatable: repeatable,
}
}
// NewRepeatReadCloserWithReadCloser creates and returns a RepeatReadCloser object
// with given io.ReadCloser.
func NewReadCloserWithReadCloser(r io.ReadCloser, repeatable bool) (io.ReadCloser, error) {
content, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
defer r.Close()
return &ReadCloser{
content: content,
repeatable: repeatable,
}, nil
}
// Read implements the io.ReadCloser interface.
func (b *ReadCloser) Read(p []byte) (n int, err error) {
n = copy(p, b.content[b.index:])
b.index += n
if b.index >= len(b.content) {
// Make it repeatable reading.
if b.repeatable {
b.index = 0
}
return n, io.EOF
}
return n, nil
}
// Close implements the io.ReadCloser interface.
func (b *ReadCloser) Close() error {
return nil
}