/// <summary>Decodes Huffman trees from input stream and constructs lookup tables.</summary>
/// <param name="group">target POJO</param>
/// <param name="br">data source</param>
internal static void Decode(Brotli.HuffmanTreeGroup group, Brotli.BitReader br)
{
int next = 0;
int n = group.trees.Length;
for (int i = 0; i < n; i++)
{
group.trees[i] = next;
Brotli.Decode.ReadHuffmanCode(group.alphabetSize, group.codes, next, br);
next += Brotli.Huffman.HuffmanMaxTableSize;
}
}
/// <summary>Initializes the Huffman tree group.</summary>
/// <param name="group">POJO to be initialised</param>
/// <param name="alphabetSize">the maximal alphabet size in this group</param>
/// <param name="n">number of Huffman codes</param>
internal static void Init(Brotli.HuffmanTreeGroup group, int alphabetSize, int n)
{
group.alphabetSize = alphabetSize;
group.codes = new int[n * Brotli.Huffman.HuffmanMaxTableSize];
group.trees = new int[n];
}