Function decodeMetaBlockLength

js/decode.ts:187–238

(s: State)

  return 0;
}
function decodeMetaBlockLength(s: State): number {
  if (s.bitOffset >= 16) {
    s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
    s.bitOffset -= 16;
  }
  s.inputEnd = readFewBits(s, 1);
  s.metaBlockLength = 0;
  s.isUncompressed = 0;
  s.isMetadata = 0;
  if ((s.inputEnd !== 0) && readFewBits(s, 1) !== 0) {
    return 0;
  }
  const sizeNibbles: number = readFewBits(s, 2) + 4;
  if (sizeNibbles === 7) {
    s.isMetadata = 1;
    if (readFewBits(s, 1) !== 0) {
      return makeError(s, -6);
    }
    const sizeBytes: number = readFewBits(s, 2);
    if (sizeBytes === 0) {
      return 0;
    }
    for (let i = 0; i < sizeBytes; ++i) {
      if (s.bitOffset >= 16) {
        s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
        s.bitOffset -= 16;
      }
      const bits: number = readFewBits(s, 8);
      if (bits === 0 && i + 1 === sizeBytes && sizeBytes > 1) {
        return makeError(s, -8);
      }
      s.metaBlockLength += bits << (i * 8);
    }
  } else {
    for (let i = 0; i < sizeNibbles; ++i) {
      if (s.bitOffset >= 16) {
        s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
        s.bitOffset -= 16;
      }
      const bits: number = readFewBits(s, 4);
      if (bits === 0 && i + 1 === sizeNibbles && sizeNibbles > 4) {
        return makeError(s, -8);
      }
      s.metaBlockLength += bits << (i * 4);
    }
  }
  s.metaBlockLength++;
  if (s.inputEnd === 0) {
    s.isUncompressed = readFewBits(s, 1);
  }
  return 0;
}
function readSymbol(tableGroup: Int32Array, tableIdx: number, s: State): number {
  let offset: number = tableGroup[tableIdx];
  const v: number = s.accumulator32 >>> s.bitOffset;