private void addJVMAvailableCharsets() {
		// Add charsets that can be discovered in the current JVM.
		for (String csName : Charset.availableCharsets().keySet()) {
			if (charsetInfoRecsByName.containsKey(csName)) {
				continue;
			}
			addCharset(csName, 1);
		}
	}
Returns list of {@link Charset}s that encode with the number of bytes specified.
@param size the number of bytes for the {@link Charset} encoding.
@return Charsets that encode one byte characters.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/CharsetInfo.java