func()

in encode.go [211:266]

• 49 lines of code
• 9 McCabe index (conditional complexity)

func (w *Writer) write(p []byte) (nRet int, errRet error) {
	if w.err != nil {
		return 0, w.err
	}
	for len(p) > 0 {
		obufStart := len(magicChunk)
		if !w.wroteStreamHeader {
			w.wroteStreamHeader = true
			copy(w.obuf, magicChunk)
			obufStart = 0
		}

		var uncompressed []byte
		if len(p) > maxBlockSize {
			uncompressed, p = p[:maxBlockSize], p[maxBlockSize:]
		} else {
			uncompressed, p = p, nil
		}
		checksum := crc(uncompressed)

		// Compress the buffer, discarding the result if the improvement
		// isn't at least 12.5%.
		compressed := Encode(w.obuf[obufHeaderLen:], uncompressed)
		chunkType := uint8(chunkTypeCompressedData)
		chunkLen := 4 + len(compressed)
		obufEnd := obufHeaderLen + len(compressed)
		if len(compressed) >= len(uncompressed)-len(uncompressed)/8 {
			chunkType = chunkTypeUncompressedData
			chunkLen = 4 + len(uncompressed)
			obufEnd = obufHeaderLen
		}

		// Fill in the per-chunk header that comes before the body.
		w.obuf[len(magicChunk)+0] = chunkType
		w.obuf[len(magicChunk)+1] = uint8(chunkLen >> 0)
		w.obuf[len(magicChunk)+2] = uint8(chunkLen >> 8)
		w.obuf[len(magicChunk)+3] = uint8(chunkLen >> 16)
		w.obuf[len(magicChunk)+4] = uint8(checksum >> 0)
		w.obuf[len(magicChunk)+5] = uint8(checksum >> 8)
		w.obuf[len(magicChunk)+6] = uint8(checksum >> 16)
		w.obuf[len(magicChunk)+7] = uint8(checksum >> 24)

		if _, err := w.w.Write(w.obuf[obufStart:obufEnd]); err != nil {
			w.err = err
			return nRet, err
		}
		if chunkType == chunkTypeUncompressedData {
			if _, err := w.w.Write(uncompressed); err != nil {
				w.err = err
				return nRet, err
			}
		}
		nRet += len(uncompressed)
	}
	return nRet, nil
}