private byte[] InflateBuffer(byte[] b, int length) { int bufferSize = 1024; byte[] buffer = new byte[bufferSize]; ZlibCodec decompressor = new ZlibCodec(); byte[] DecompressedBytes = new byte[length]; TestContext.WriteLine("\n============================================"); TestContext.WriteLine("Size of Buffer to Inflate: {0} bytes.", b.Length); MemoryStream ms = new MemoryStream(DecompressedBytes); int rc = decompressor.InitializeInflate(); decompressor.InputBuffer = b; decompressor.NextIn = 0; decompressor.AvailableBytesIn = b.Length; decompressor.OutputBuffer = buffer; for (int pass = 0; pass < 2; pass++) { FlushType flush = (pass==0) ? FlushType.None : FlushType.Finish; do { decompressor.NextOut = 0; decompressor.AvailableBytesOut = buffer.Length; rc = decompressor.Inflate(flush); if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END) throw new Exception("inflating: " + decompressor.Message); if (buffer.Length - decompressor.AvailableBytesOut > 0) ms.Write(decompressor.OutputBuffer, 0, buffer.Length - decompressor.AvailableBytesOut); } while (decompressor.AvailableBytesIn > 0 || decompressor.AvailableBytesOut == 0); } decompressor.EndInflate(); TestContext.WriteLine("TBO({0}).", decompressor.TotalBytesOut); return DecompressedBytes; }
public void Zlib_Codec_TestLargeDeflateInflate() { int rc; int j; int bufferSize = 80000; byte[] compressedBytes = new byte[bufferSize]; byte[] workBuffer = new byte[bufferSize / 4]; ZlibCodec compressingStream = new ZlibCodec(); rc = compressingStream.InitializeDeflate(CompressionLevel.Level1); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeDeflate() [{0}]", compressingStream.Message)); compressingStream.OutputBuffer = compressedBytes; compressingStream.AvailableBytesOut = compressedBytes.Length; compressingStream.NextOut = 0; System.Random rnd = new Random(); for (int k = 0; k < 4; k++) { switch (k) { case 0: // At this point, workBuffer is all zeroes, so it should compress very well. break; case 1: // switch to no compression, keep same workBuffer (all zeroes): compressingStream.SetDeflateParams(CompressionLevel.None, CompressionStrategy.Default); break; case 2: // Insert data into workBuffer, and switch back to compressing mode. // we'll use lengths of the same random byte: for (int i = 0; i < workBuffer.Length / 1000; i++) { byte b = (byte)rnd.Next(); int n = 500 + rnd.Next(500); for (j = 0; j < n; j++) workBuffer[j + i] = b; i += j - 1; } compressingStream.SetDeflateParams(CompressionLevel.BestCompression, CompressionStrategy.Filtered); break; case 3: // insert totally random data into the workBuffer rnd.NextBytes(workBuffer); break; } compressingStream.InputBuffer = workBuffer; compressingStream.NextIn = 0; compressingStream.AvailableBytesIn = workBuffer.Length; rc = compressingStream.Deflate(FlushType.None); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Deflate({0}) [{1}]", k, compressingStream.Message)); if (k == 0) Assert.AreEqual<int>(0, compressingStream.AvailableBytesIn, "Deflate should be greedy."); TestContext.WriteLine("Stage {0}: uncompressed/compresssed bytes so far: ({1,6}/{2,6})", k, compressingStream.TotalBytesIn, compressingStream.TotalBytesOut); } rc = compressingStream.Deflate(FlushType.Finish); Assert.AreEqual<int>(ZlibConstants.Z_STREAM_END, rc, String.Format("at Deflate() [{0}]", compressingStream.Message)); rc = compressingStream.EndDeflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndDeflate() [{0}]", compressingStream.Message)); TestContext.WriteLine("Final: uncompressed/compressed bytes: ({0,6},{1,6})", compressingStream.TotalBytesIn, compressingStream.TotalBytesOut); ZlibCodec decompressingStream = new ZlibCodec(CompressionMode.Decompress); decompressingStream.InputBuffer = compressedBytes; decompressingStream.NextIn = 0; decompressingStream.AvailableBytesIn = bufferSize; // upon inflating, we overwrite the decompressedBytes buffer repeatedly int nCycles = 0; while (true) { decompressingStream.OutputBuffer = workBuffer; decompressingStream.NextOut = 0; decompressingStream.AvailableBytesOut = workBuffer.Length; rc = decompressingStream.Inflate(FlushType.None); nCycles++; if (rc == ZlibConstants.Z_STREAM_END) break; Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Inflate() [{0}] TotalBytesOut={1}", decompressingStream.Message, decompressingStream.TotalBytesOut)); } rc = decompressingStream.EndInflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndInflate() [{0}]", decompressingStream.Message)); Assert.AreEqual<int>(4 * workBuffer.Length, (int)decompressingStream.TotalBytesOut); TestContext.WriteLine("compressed length: {0}", compressingStream.TotalBytesOut); TestContext.WriteLine("decompressed length (expected): {0}", 4 * workBuffer.Length); TestContext.WriteLine("decompressed length (actual) : {0}", decompressingStream.TotalBytesOut); TestContext.WriteLine("decompression cycles: {0}", nCycles); }
public void Zlib_BasicDictionaryDeflateInflate() { int rc; int comprLen = 40000; int uncomprLen = comprLen; byte[] uncompr = new byte[uncomprLen]; byte[] compr = new byte[comprLen]; //long dictId; ZlibCodec compressor = new ZlibCodec(); rc = compressor.InitializeDeflate(CompressionLevel.BestCompression); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeDeflate() [{0}]", compressor.Message)); string dictionaryWord = "hello "; byte[] dictionary = System.Text.ASCIIEncoding.ASCII.GetBytes(dictionaryWord); string TextToCompress = "hello, hello! How are you, Joe? I said hello. "; byte[] BytesToCompress = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress); rc = compressor.SetDictionary(dictionary); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at SetDeflateDictionary() [{0}]", compressor.Message)); int dictId = compressor.Adler32; compressor.OutputBuffer = compr; compressor.NextOut = 0; compressor.AvailableBytesOut = comprLen; compressor.InputBuffer = BytesToCompress; compressor.NextIn = 0; compressor.AvailableBytesIn = BytesToCompress.Length; rc = compressor.Deflate(FlushType.Finish); Assert.AreEqual<int>(ZlibConstants.Z_STREAM_END, rc, String.Format("at Deflate() [{0}]", compressor.Message)); rc = compressor.EndDeflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndDeflate() [{0}]", compressor.Message)); ZlibCodec decompressor = new ZlibCodec(); decompressor.InputBuffer = compr; decompressor.NextIn = 0; decompressor.AvailableBytesIn = comprLen; rc = decompressor.InitializeInflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeInflate() [{0}]", decompressor.Message)); decompressor.OutputBuffer = uncompr; decompressor.NextOut = 0; decompressor.AvailableBytesOut = uncomprLen; while (true) { rc = decompressor.Inflate(FlushType.None); if (rc == ZlibConstants.Z_STREAM_END) { break; } if (rc == ZlibConstants.Z_NEED_DICT) { Assert.AreEqual<long>(dictId, decompressor.Adler32, "Unexpected Dictionary"); rc = decompressor.SetDictionary(dictionary); } Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Inflate/SetInflateDictionary() [{0}]", decompressor.Message)); } rc = decompressor.EndInflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndInflate() [{0}]", decompressor.Message)); int j = 0; for (; j < uncompr.Length; j++) if (uncompr[j] == 0) break; Assert.AreEqual<int>(TextToCompress.Length, j, String.Format("Unequal lengths")); int i = 0; for (i = 0; i < j; i++) if (TextToCompress[i] != uncompr[i]) break; Assert.AreEqual<int>(j, i, String.Format("Non-identical content")); var result = System.Text.ASCIIEncoding.ASCII.GetString(uncompr, 0, j); TestContext.WriteLine("orig length: {0}", TextToCompress.Length); TestContext.WriteLine("compressed length: {0}", compressor.TotalBytesOut); TestContext.WriteLine("uncompressed length: {0}", decompressor.TotalBytesOut); TestContext.WriteLine("result length: {0}", result.Length); TestContext.WriteLine("result of inflate:\n{0}", result); }
public void Zlib_TestFlushSync() { int rc; int bufferSize = 40000; byte[] CompressedBytes = new byte[bufferSize]; byte[] DecompressedBytes = new byte[bufferSize]; string TextToCompress = "This is the text that will be compressed."; byte[] BytesToCompress = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress); ZlibCodec compressor = new ZlibCodec(CompressionMode.Compress); compressor.InputBuffer = BytesToCompress; compressor.NextIn = 0; compressor.AvailableBytesIn = 3; compressor.OutputBuffer = CompressedBytes; compressor.NextOut = 0; compressor.AvailableBytesOut = CompressedBytes.Length; rc = compressor.Deflate(FlushType.Full); CompressedBytes[3]++; // force an error in first compressed block // dinoch - ?? compressor.AvailableBytesIn = TextToCompress.Length - 3; rc = compressor.Deflate(FlushType.Finish); Assert.AreEqual<int>(ZlibConstants.Z_STREAM_END, rc, String.Format("at Deflate() [{0}]", compressor.Message)); rc = compressor.EndDeflate(); bufferSize = (int)(compressor.TotalBytesOut); ZlibCodec decompressor = new ZlibCodec(CompressionMode.Decompress); decompressor.InputBuffer = CompressedBytes; decompressor.NextIn = 0; decompressor.AvailableBytesIn = 2; decompressor.OutputBuffer = DecompressedBytes; decompressor.NextOut = 0; decompressor.AvailableBytesOut = DecompressedBytes.Length; rc = decompressor.Inflate(FlushType.None); decompressor.AvailableBytesIn = bufferSize - 2; rc = decompressor.SyncInflate(); bool gotException = false; try { rc = decompressor.Inflate(FlushType.Finish); } catch (ZlibException ex1) { TestContext.WriteLine("Got Expected Exception: " + ex1); gotException = true; } Assert.IsTrue(gotException, "inflate should report DATA_ERROR"); rc = decompressor.EndInflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndInflate() [{0}]", decompressor.Message)); int j = 0; for (; j < DecompressedBytes.Length; j++) if (DecompressedBytes[j] == 0) break; var result = System.Text.ASCIIEncoding.ASCII.GetString(DecompressedBytes, 0, j); Assert.AreEqual<int>(TextToCompress.Length, result.Length + 3, "Strings are unequal lengths"); Console.WriteLine("orig length: {0}", TextToCompress.Length); Console.WriteLine("compressed length: {0}", compressor.TotalBytesOut); Console.WriteLine("uncompressed length: {0}", decompressor.TotalBytesOut); Console.WriteLine("result length: {0}", result.Length); Console.WriteLine("result of inflate:\n(Thi){0}", result); }
public void Zlib_BasicDeflateAndInflate() { string TextToCompress = LoremIpsum; int rc; int bufferSize = 40000; byte[] compressedBytes = new byte[bufferSize]; byte[] decompressedBytes = new byte[bufferSize]; ZlibCodec compressingStream = new ZlibCodec(); rc = compressingStream.InitializeDeflate(CompressionLevel.Default); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeDeflate() [{0}]", compressingStream.Message)); compressingStream.InputBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress); compressingStream.NextIn = 0; compressingStream.OutputBuffer = compressedBytes; compressingStream.NextOut = 0; while (compressingStream.TotalBytesIn != TextToCompress.Length && compressingStream.TotalBytesOut < bufferSize) { compressingStream.AvailableBytesIn = compressingStream.AvailableBytesOut = 1; // force small buffers rc = compressingStream.Deflate(FlushType.None); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Deflate(1) [{0}]", compressingStream.Message)); } while (true) { compressingStream.AvailableBytesOut = 1; rc = compressingStream.Deflate(FlushType.Finish); if (rc == ZlibConstants.Z_STREAM_END) break; Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Deflate(2) [{0}]", compressingStream.Message)); } rc = compressingStream.EndDeflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndDeflate() [{0}]", compressingStream.Message)); ZlibCodec decompressingStream = new ZlibCodec(); decompressingStream.InputBuffer = compressedBytes; decompressingStream.NextIn = 0; decompressingStream.OutputBuffer = decompressedBytes; decompressingStream.NextOut = 0; rc = decompressingStream.InitializeInflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeInflate() [{0}]", decompressingStream.Message)); //CheckForError(decompressingStream, rc, "inflateInit"); while (decompressingStream.TotalBytesOut < decompressedBytes.Length && decompressingStream.TotalBytesIn < bufferSize) { decompressingStream.AvailableBytesIn = decompressingStream.AvailableBytesOut = 1; /* force small buffers */ rc = decompressingStream.Inflate(FlushType.None); if (rc == ZlibConstants.Z_STREAM_END) break; Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Inflate() [{0}]", decompressingStream.Message)); //CheckForError(decompressingStream, rc, "inflate"); } rc = decompressingStream.EndInflate(); Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndInflate() [{0}]", decompressingStream.Message)); //CheckForError(decompressingStream, rc, "inflateEnd"); int j = 0; for (; j < decompressedBytes.Length; j++) if (decompressedBytes[j] == 0) break; Assert.AreEqual<int>(TextToCompress.Length, j, String.Format("Unequal lengths")); int i = 0; for (i = 0; i < j; i++) if (TextToCompress[i] != decompressedBytes[i]) break; Assert.AreEqual<int>(j, i, String.Format("Non-identical content")); var result = System.Text.ASCIIEncoding.ASCII.GetString(decompressedBytes, 0, j); TestContext.WriteLine("orig length: {0}", TextToCompress.Length); TestContext.WriteLine("compressed length: {0}", compressingStream.TotalBytesOut); TestContext.WriteLine("decompressed length: {0}", decompressingStream.TotalBytesOut); TestContext.WriteLine("result length: {0}", result.Length); TestContext.WriteLine("result of inflate:\n{0}", result); return; }