hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.java [878:890]:
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    public void readMultiLevelIndexRoot(HFileBlock blk, final int numEntries) throws IOException {
      DataInputStream in = readRootIndex(blk, numEntries);
      // HFileBlock.getByteStream() returns a byte stream for reading the data(excluding checksum)
      // of root index block, so after reading the root index there is no need to subtract the
      // checksum bytes.
      if (in.available() < MID_KEY_METADATA_SIZE) {
        // No mid-key metadata available.
        return;
      }
      midLeafBlockOffset = in.readLong();
      midLeafBlockOnDiskSize = in.readInt();
      midKeyEntry = in.readInt();
    }
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hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/NoOpIndexBlockEncoder.java [204:216]:
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    private void init(HFileBlock blk, int numEntries) throws IOException {
      DataInputStream in = readRootIndex(blk, numEntries);
      // HFileBlock.getByteStream() returns a byte stream for reading the data(excluding checksum)
      // of root index block, so after reading the root index there is no need to subtract the
      // checksum bytes.
      if (in.available() < MID_KEY_METADATA_SIZE) {
        // No mid-key metadata available.
        return;
      }
      midLeafBlockOffset = in.readLong();
      midLeafBlockOnDiskSize = in.readInt();
      midKeyEntry = in.readInt();
    }
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