public int setAugmentationDataExLength(int len) {
		if (intAugmentationDataExLength > 0) {
			return -1;
		}
		intAugmentationDataExLength = len;

		try {
			updateAugmentationDataEx();
		}
		catch (MemoryAccessException mae) {
			// ignored
		}

		return len;
	}
Sets the value this region descriptor maintains to indicate the length of the 
augmentation data.

@param len number of bytes that compose the augmentation data
@return the length of the augmentation data or -1 if it has already been set.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/exceptionhandlers/gcc/structures/ehFrame/FrameDescriptionEntry.java