static int getMappedSourceByteCount(int mappingScheme) {
		int mappedSourceByteCount = 1;
		if (mappingScheme != 0) {
			mappedSourceByteCount = mappingScheme & 0x7F;
		}
		return mappedSourceByteCount;
	}
Extract the mapping ratio mapped-source-byte-count from a mappingScheme value.
@param mappingScheme mapping scheme
@return mapped-source-byte-count (aka schemeSrcByteCount)
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/ByteMappingScheme.java