Initial fixed huffman coding for png.

test/compression/TestHuffmanStream.cpp

@@ -0,0 +1,60 @@
+#include <iostream>
+
+#include "HuffmanStream.h"
+
+
+void testHuffmanCodeLengthTable()
+{
+    HuffmanCodeLengthTable table;
+
+    std::vector<std::pair<unsigned, unsigned char> > mappings {{144, 8}, {112, 9}, {24, 7}, {8 ,8}};
+    std::vector<unsigned char> code_length_sequence;
+    for(const auto& entry : mappings)
+    {
+        for(unsigned idx=0;idx<entry.first;idx++)
+        {
+            code_length_sequence.push_back(entry.second);
+        }
+    }
+    table.setInputLengthSequence(code_length_sequence, false);
+
+    table.buildCompressedLengthSequence();
+
+    auto compressed_sequence = table.getCompressedLengthSequence();
+    for (auto entry : compressed_sequence)
+    {
+        std::cout << "Count " << entry.first << " extra bits " << entry.second << std::endl;
+    }
+
+    auto compressed_lengths = table.getCompressedLengthCounts();
+    for(unsigned idx = 0; idx<compressed_lengths.size(); idx++)
+    {
+        std::cout << "Slot " << idx << " length " << compressed_lengths[idx] << std::endl;
+    }
+
+}
+
+
+int main()
+{
+    testHuffmanCodeLengthTable();
+    //HuffmanStream stream(nullptr, nullptr);
+
+    //stream.setCodeLengthAlphabetLengths({3, 3, 3, 3, 3, 2, 4, 4});
+
+    //stream.setCodeLengthAlphabetLengths({2, 2, 3, 3, 3, 3});
+
+    //stream.buildCodeLengthMapping();
+
+    std::cout << "*******" << std::endl;
+    //stream.setCodeLengthAlphabetLengths({4, 0, 6, 7, 3, 2, 4, 2, 7, 4, 6, 3, 0, 6});
+
+    //stream.buildCodeLengthMapping();
+
+    //const auto mapping = stream.getCodeLengthMapping();
+
+    //stream.generateFixedCodeMapping();
+
+
+    return 0;
+}