func()

in flexzlib/reader.go [82:117]

• 28 lines of code
• 8 McCabe index (conditional complexity)

func (z *Reader) Read(p []byte) (n int, err error) {
	if z.err != nil {
		return 0, z.err
	}
	if len(p) == 0 {
		return 0, nil
	}

	n, err = z.decompressor.Read(p)
	z.digest.Write(p[0:n])

	if err == io.ErrUnexpectedEOF {
		err = io.EOF
	}

	if n != 0 || err != io.EOF {
		z.err = err
		return
	}

	// Do not need checksuming
	return

	// Finished file; check checksum.
	if _, err := io.ReadFull(z.r, z.scratch[0:4]); err != nil {
		z.err = err
		return 0, err
	}
	// ZLIB (RFC 1950) is big-endian, unlike GZIP (RFC 1952).
	checksum := uint32(z.scratch[0])<<24 | uint32(z.scratch[1])<<16 | uint32(z.scratch[2])<<8 | uint32(z.scratch[3])
	if checksum != z.digest.Sum32() {
		z.err = ErrChecksum
		return 0, z.err
	}
	return
}