Method decodeBlockTypeAndLength

java/org/brotli/dec/Decode.java:732–752

(State s, int treeType, int numBlockTypes)

  }

  private static int decodeBlockTypeAndLength(State s, int treeType, int numBlockTypes) {
    final int[] ringBuffers = s.rings;
    final int offset = 4 + treeType * 2;
    BitReader.fillBitWindow(s);
    int blockType = readSymbol(s.blockTrees, 2 * treeType, s);
    final int result = readBlockLength(s.blockTrees, 2 * treeType + 1, s);

    if (blockType == 1) {
      blockType = ringBuffers[offset + 1] + 1;
    } else if (blockType == 0) {
      blockType = ringBuffers[offset];
    } else {
      blockType -= 2;
    }
    if (blockType >= numBlockTypes) {
      blockType -= numBlockTypes;
    }
    ringBuffers[offset] = ringBuffers[offset + 1];
    ringBuffers[offset + 1] = blockType;
    return result;
  }

  private static void decodeLiteralBlockSwitch(State s) {
    s.literalBlockLength = decodeBlockTypeAndLength(s, 0, s.numLiteralBlockTypes);