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package io
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import "io"
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func ReadBytes(reader io.Reader, len int, bytes []byte) (int, error) {
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readLen := 0
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for readLen = 0; readLen < len; {
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nowReadLen, err := reader.Read(bytes[readLen:])
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if nowReadLen == 0 {
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return readLen, err
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}
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readLen += nowReadLen
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}
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return readLen, nil
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}
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