Method readProtoBufVarint

src/HBaseRpc.java:1358–1386

Reads a 32-bit variable-length integer value as used in Protocol Buffers. @param buf The buffer to read from. @return The integer read.

(final ChannelBuffer buf)

   * @return The integer read.
   */
  static int readProtoBufVarint(final ChannelBuffer buf) {
    int result = buf.readByte();
    if (result >= 0) {
      return result;
    }
    result &= 0x7F;
    result |= buf.readByte() << 7;
    if (result >= 0) {
      return result;
    }
    result &= 0x3FFF;
    result |= buf.readByte() << 14;
    if (result >= 0) {
      return result;
    }
    result &= 0x1FFFFF;
    result |= buf.readByte() << 21;
    if (result >= 0) {
      return result;
    }
    result &= 0x0FFFFFFF;
    final byte b = buf.readByte();
    result |= b << 28;
    if (b >= 0) {
      return result;
    }
    throw new IllegalArgumentException("Not a 32 bit varint: " + result
                                       + " (5th byte: " + b + ")");
  }

}