code: public static void decompressOneBlock(int[] decompBlock, int[] inBlock,
                  int blockSize) {
                  int expNum = inBlock[0] & MASK[31 - POSSIBLE_B_BITS];
                  int bits = (inBlock[0] >>> (31 - POSSIBLE_B_BITS)) & (0x1f);
  
                  int[] expPosBuffer = new int[blockSize];
                  int[] expHighBitsBuffer = new int[blockSize];
  
                  // decompress the b-bit slots
                  int offset = HEADER_SIZE;
                  int compressedBits = 0;
                  if (bits == 0) {
                          Arrays.fill(decompBlock, 0);
                  } else {
                          compressedBits = decompressBBitSlots(decompBlock,
                                  inBlock, blockSize, bits);
                          // compressedBits =
                          // decompressBBitSlotsWithHardCodes(decompBlock,
                          // inBlock, blockSize, bits);
                  }
                  offset += compressedBits;
  
                  // decompress exceptions
                  if (expNum > 0) {
                          compressedBits = decompressBlockByS16(expPosBuffer,
                                  inBlock, offset, expNum);
                          offset += compressedBits;
                          compressedBits = decompressBlockByS16(
                                  expHighBitsBuffer, inBlock, offset, expNum);
                          offset += compressedBits;
  
                          for (int i = 0; i < expNum; i++) {
                                  int curExpPos = expPosBuffer[i];
                                  int curHighBits = expHighBitsBuffer[i];
                                  decompBlock[curExpPos] = (decompBlock[curExpPos] & MASK[bits])
                                          | ((curHighBits & MASK[32 - bits]) << bits);
                          }
                  }
          }
docs: Decompress one block using PForDelta
  
  @param decompBlock
  the block that was decompressed
  @param inBlock
  the block to be decompressed
  @param blockSize
  the number of elements in the decompressed block