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	优化内容为空的缓存
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		@@ -215,6 +215,10 @@ func (this *FileReader) ReadHeader(buf []byte, callback ReaderFunc) error {
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}
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func (this *FileReader) ReadBody(buf []byte, callback ReaderFunc) error {
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	if this.bodySize == 0 {
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		return nil
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	}
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	var isOk = false
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	defer func() {
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@@ -257,6 +261,12 @@ func (this *FileReader) ReadBody(buf []byte, callback ReaderFunc) error {
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}
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func (this *FileReader) Read(buf []byte) (n int, err error) {
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	if this.bodySize == 0 {
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		n = 0
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		err = io.EOF
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		return
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	}
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	n, err = this.fp.Read(buf)
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	if err != nil && err != io.EOF {
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		_ = this.discard()
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@@ -1213,9 +1213,12 @@ func (this *FileStorage) hotLoop() {
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			}
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			err = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
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				_, err = writer.Write(buf[:n])
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				if err == nil {
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					goNext = true
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				goNext = true
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				if n > 0 {
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					_, err = writer.Write(buf[:n])
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					if err != nil {
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						goNext = false
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					}
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				}
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				return
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			})
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