public void TestMultipleIDATChunksAreTreatedAsASingleDeflatedBuffer()
{
byte[] originalData = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xA0 };
byte[] deflateOriginalData = DeflateBytes(originalData);
int splitAtIndex = 4;
byte[] chunk1Data = deflateOriginalData.Take(splitAtIndex).ToArray();
byte[] chunk2Data = deflateOriginalData.Skip(splitAtIndex).ToArray();
List <PNGChunk> chunks = new List <PNGChunk>()
{
new PNGChunk(PNGChunk.StringFromType(PNGChunk.ChunkType.CgBI), new byte[] { }, 0),
new PNGChunk(PNGChunk.StringFromType(PNGChunk.ChunkType.IDAT), chunk1Data, 0),
new PNGChunk(PNGChunk.StringFromType(PNGChunk.ChunkType.IDAT), chunk2Data, 0)
};
IEnumerable <PNGChunk> decrushedChunks = PNGDecrusher.DecrushChunks(chunks);
byte[] zlibChunk1 = decrushedChunks.First().Data;
byte[] zlibChunk2 = decrushedChunks.Last().Data;
byte[] zlibChunksCombined = new byte[zlibChunk1.Length + zlibChunk2.Length];
zlibChunk1.CopyTo(zlibChunksCombined, 0);
zlibChunk2.CopyTo(zlibChunksCombined, zlibChunk1.Length);
byte[] dezlibbedData = DecompressZlibBytes(zlibChunksCombined);
Assert.AreEqual(originalData.Length, dezlibbedData.Length);
CollectionAssert.AreEqual(originalData, dezlibbedData);
}
public void TestAppleChunkIsRemovedWhenDecrushing()
{
IEnumerable <PNGChunk> chunks = new List <PNGChunk>()
{
new PNGChunk(PNGChunk.StringFromType(PNGChunk.ChunkType.CgBI), new byte[] { 0x01, 0x02, 0x03 }, 12345),
new PNGChunk(PNGChunk.StringFromType(PNGChunk.ChunkType.IDAT), DeflateBytes(new byte[] { 0x01, 0x02, 0x03 }), 12345),
new PNGChunk("IEND", new byte[] { }, 0xFFFFFF)
};
IEnumerable <PNGChunk> fixedChunks = PNGDecrusher.DecrushChunks(chunks);
Assert.AreEqual(2, fixedChunks.Count());
Assert.AreEqual(PNGChunk.ChunkType.IDAT, fixedChunks.ToArray()[0].Type);
Assert.AreEqual("IEND", fixedChunks.ToArray()[1].TypeString);
}
public void TestDecrushedIDATDataIsSameAsOriginalAfterDecompressing()
{
byte[] originalData = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };
byte[] deflatedOriginalData = DeflateBytes(originalData);
List <PNGChunk> chunks = new List <PNGChunk>()
{
new PNGChunk(PNGChunk.StringFromType(PNGChunk.ChunkType.CgBI), new byte[] { }, 0),
new PNGChunk(PNGChunk.StringFromType(PNGChunk.ChunkType.IDAT), deflatedOriginalData, 0)
};
IEnumerable <PNGChunk> decrushedChunks = PNGDecrusher.DecrushChunks(chunks);
Assert.AreEqual(1, decrushedChunks.Count());
byte[] zlibData = decrushedChunks.First().Data;
byte[] dezlibbedData = DecompressZlibBytes(zlibData);
Assert.AreEqual(originalData.Length, dezlibbedData.Length);
CollectionAssert.AreEqual(originalData, dezlibbedData);
}
private static PNGChunk IDATChunkWithBytes(byte[] bytes)
{
string type = PNGChunk.StringFromType(PNGChunk.ChunkType.IDAT);
return(new PNGChunk(type, bytes, CalculateCRCForChunk(type, bytes)));
}