public void TestWritingChunksProducesIdenticalBytesAsInput()
{
byte[] input = Simple10x10WhitePNG;
using (MemoryStream stream = new MemoryStream(Simple10x10WhitePNG))
{
PNGChunk[] chunks = PNGChunkParser.ChunksFromStream(stream).ToArray();
MemoryStream output = new MemoryStream();
PNGChunkParser.WriteChunksAsPNG(chunks, output);
byte[] outputBytes = output.ToArray();
CollectionAssert.AreEqual(input, outputBytes);
}
}
public void TestWritingChunksAfterRecalculatingCRCProducesIdenticalBytesAsInput()
{
byte[] input = Simple10x10WhitePNG;
using (MemoryStream stream = new MemoryStream(Simple10x10WhitePNG))
{
PNGChunk[] chunks = PNGChunkParser.ChunksFromStream(stream).ToArray();
chunks = chunks.Select(c =>
{
return(new PNGChunk(c.TypeString, c.Data, PNGDecrusher.CalculateCRCForChunk(c.TypeString, c.Data)));
}).ToArray();
MemoryStream output = new MemoryStream();
PNGChunkParser.WriteChunksAsPNG(chunks, output);
byte[] outputBytes = output.ToArray();
CollectionAssert.AreEqual(input, outputBytes);
}
}
private static void DecrushAtChunkLevel(Stream input, Stream output)
{
IEnumerable <PNGChunk> fixedChunks = DecrushChunks(PNGChunkParser.ChunksFromStream(input));
PNGChunkParser.WriteChunksAsPNG(fixedChunks, output);
}
