Function readNextMetablockHeader

js/decode.ts:608–655

(s: State)

  s.ringBufferSize = newSize;
}
function readNextMetablockHeader(s: State): number {
  if (s.inputEnd !== 0) {
    s.nextRunningState = 10;
    s.runningState = 12;
    return 0;
  }
  s.literalTreeGroup = new Int32Array(0);
  s.commandTreeGroup = new Int32Array(0);
  s.distanceTreeGroup = new Int32Array(0);
  let result: number;
  if (s.halfOffset > 2030) {
    result = readMoreInput(s);
    if (result < 0) {
      return result;
    }
  }
  result = decodeMetaBlockLength(s);
  if (result < 0) {
    return result;
  }
  if ((s.metaBlockLength === 0) && (s.isMetadata === 0)) {
    return 0;
  }
  if ((s.isUncompressed !== 0) || (s.isMetadata !== 0)) {
    result = jumpToByteBoundary(s);
    if (result < 0) {
      return result;
    }
    if (s.isMetadata === 0) {
      s.runningState = 6;
    } else {
      s.runningState = 5;
    }
  } else {
    s.runningState = 3;
  }
  if (s.isMetadata !== 0) {
    return 0;
  }
  s.expectedTotalSize += s.metaBlockLength;
  if (s.expectedTotalSize > 1 << 30) {
    s.expectedTotalSize = 1 << 30;
  }
  if (s.ringBufferSize < s.maxRingBufferSize) {
    maybeReallocateRingBuffer(s);
  }
  return 0;
}
function readMetablockPartition(s: State, treeType: number, numBlockTypes: number): number {
  let offset: number = s.blockTrees[2 * treeType];
  if (numBlockTypes <= 1) {