public int getByte(int off) {
    checkOffsets(off, off + 1);
    return getByte0(off);
  }
Gets the {@code signed byte} value at a particular offset.

@param off {@code >= 0, < size();} offset to fetch
@return {@code signed byte} at that offset
android/android_framework/dex-maker/src/main/java/com/android/dx/util/ByteArray.java