writeBackReference method

void writeBackReference(int distance, int count)

Append count bytes copied from distance bytes before the current end of the stream (an LZ77 back-reference, as used by Inflate). Correctly handles overlapping copies where count > distance (e.g. RLE-style runs), reproducing the repeating pattern.

This default implementation is expressed in terms of subset and writeBytes; subclasses backed by a contiguous buffer should override it with a direct in-buffer copy to avoid per-iteration view allocations.

Implementation

void writeBackReference(int distance, int count) {
  while (count > distance) {
    writeBytes(subset(-distance));
    count -= distance;
  }
  if (count == distance) {
    writeBytes(subset(-distance));
  } else {
    writeBytes(subset(-distance, count - distance));
  }
}