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29 lines
687 B
Go
29 lines
687 B
Go
package util
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import (
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"bytes"
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"errors"
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)
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// BufBinWriter is an additional layer on top of BinWriter that
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// automatically creates buffer to write into that you can get after all
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// writes via Bytes().
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type BufBinWriter struct {
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*BinWriter
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buf *bytes.Buffer
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}
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// NewBufBinWriter makes a BufBinWriter with an empty byte buffer.
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func NewBufBinWriter() *BufBinWriter {
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b := new(bytes.Buffer)
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return &BufBinWriter{BinWriter: NewBinWriterFromIO(b), buf: b}
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}
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// Bytes returns resulting buffer and makes future writes return an error.
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func (bw *BufBinWriter) Bytes() []byte {
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if bw.Err != nil {
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return nil
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}
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bw.Err = errors.New("buffer already drained")
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return bw.buf.Bytes()
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}
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