Convert lz77 to use fixed buffer sizes.

test/image/TestPngWriter.cpp

@@ -28,6 +28,7 @@ void testCompressedPng()
 
     PngWriter writer;
     writer.setPath("test_compressed.png");
+    writer.setCompressionMethod(Deflate::CompressionMethod::NONE);
     writer.write(image);
 
     return;
@@ -72,9 +73,40 @@ void testFixedPng()
 
 }
 
+void testDynamicCompressedPng()
+{
+    unsigned width = 10;
+    unsigned height = 10;
+    unsigned numChannels = 1;
+    auto image = Image<unsigned char>::Create(width, height);
+    image->setNumChannels(numChannels);
+    image->setBitDepth(8);
+
+    std::vector<unsigned char> data(width*height, 0);
+    for (unsigned idx=0; idx<width*height; idx++)
+    {
+        //unsigned char val = 100 * idx /(width*height);
+        unsigned char val = 10;
+        data[idx] = val;
+    }
+
+    image->setData(data);
+
+    PngWriter writer;
+    writer.setPath("test_dynamic.png");
+    writer.write(image);
+
+    //return;
+    File test_file("test_dynamic.png");
+    std::cout << test_file.dumpBinary();
+
+}
+
 int main()
 {
     //testCompressedPng();
-    testFixedPng();
+    //testFixedPng();
+    testDynamicCompressedPng();
+
     return 0;
 }