import (
	"io"
)

// debug can be set in the source to print debug info using println.
const debug = false

// compressedBlock decompresses a compressed block, storing the decompressed
// data in r.buffer. The blockSize argument is the compressed size.
// RFC 3.1.1.3.
func (r *Reader) compressedBlock(blockSize int) error {
	if len(r.compressedBuf) >= blockSize {
		r.compressedBuf = r.compressedBuf[:blockSize]
	} else {

		relativeOffset++
		v := r.scratch[0]
		for i := range r.buffer {
			r.buffer[i] = v
		}
		r.blockOffset += int64(relativeOffset)
	case 2:
		r.blockOffset += int64(relativeOffset)
		if err := r.compressedBlock(blockSize); err != nil {
			return err
		}
		r.blockOffset += int64(blockSize)
	case 3:
		return r.makeError(relativeOffset, "invalid block type")
	}

	if !r.frameSizeUnknown {