File list (Check if you may need any files):
ArrayDecoder.java
ArrayEncoder.java
CharsetMapping.java
FastCharsetProvider.java
HistoricallyNamedCharset.java
ISO_8859_1.java
SAbstractCharsetProvider.java
SingleByte.java
SingleByteDecoder.java
SingleByteEncoder.java
StreamDecoder.java
StreamEncoder.java
Surrogate.java
ThreadLocalCoders.java
Unicode.java
UnicodeDecoder.java
UnicodeEncoder.java
US_ASCII.java
UTF_16.java
UTF_16BE.java
UTF_16LE.java
UTF_16LE_BOM.java
UTF_32.java
UTF_32BE.java
UTF_32BE_BOM.java
UTF_32Coder.java
UTF_32LE.java
UTF_32LE_BOM.java
UTF_8.java
standard-charsets
ext