tANS example implementation

This is a simple example implementation of tANS encoding.

How to use

1. Create a std::string with the data to be encoded.
2. Create a std::vector<char> with all unique symbols in the string.
3. Create a std::vector<int> with the frequencies of occurences for the symbols, normalized to a power of 2.

• Note: Frequencies cannot be 0. Program may behave unexpectedly then.

3. Call std::vector<DecodeCol> decodeTable = createDecodingTable(symbols, frequencies).
4. Call std::vector<EncodeCol> encodeTable = createEncodingTable(decodeTable, symbols).
5. Do your operations.

• EncodedData data = encodeString(stringToEncode, encodeTable) for encoding.
• std::string decodedString = decodeString(&data, decodeTable, numCharsToDecode) to decode numCharsToDecode from data.