private static void RunLZW(string text)
{
List <int> compressed = LZW.Compress(text);
Console.WriteLine(string.Join(", ", compressed));
string decompressed = LZW.Decompress(compressed);
Console.WriteLine(decompressed);
Console.WriteLine($"text.Length: {text.Length}, compressed.Length: {compressed.Count}");
}
public void Compress2_Compresses_Compressed()
{
var lzw = new LZW();
var input = new MemoryStream(new byte[] { 115, 105, 114, 32, 115, 105, 100, 32, 101, 97, 115, 116, 109, 97, 110, 32, 101, 97, 115, 105, 108, 121, 32, 116, 101, 97, 115, 101, 115, 32, 115, 101, 97, 32, 115, 105, 99, 107, 32, 115, 101, 97, 108, 115 });
var output = new MemoryStream();
byte[] expected = { 58, 26, 142, 98, 24, 9, 148, 66, 102, 49, 29, 14, 166, 227, 17, 190, 15, 9, 53, 27, 79, 66, 19, 172, 32, 232, 102, 58, 65, 33, 16, 67, 81, 144, 217, 26, 49, 27, 92, 192 };
lzw.Compress(input, output);
byte[] result = output.ToArray();
CollectionAssert.AreEqual(expected, result);
}
public void Compress1_Compresses_Compressed()
{
var lzw = new LZW();
var input = new MemoryStream(new byte[] { 1, 2, 1, 2, 1, 2, 1, 2 });
var output = new MemoryStream();
byte[] expected = { 1, 0, 224, 48, 48, 32 };
lzw.Compress(input, output);
byte[] result = output.ToArray();
CollectionAssert.AreEqual(expected, result);
}
public void Compress_Compresses_Compressed()
{
var lzw = new LZW();
var input = new MemoryStream(new byte[] { 1, 2, 5, 1, 7, 2, 6, 1, 2, 5, 2, 7, 1, 2, 1 });
var output = new MemoryStream();
byte[] expected = { 1, 0, 192, 192, 32, 64, 12, 15, 1, 3, 0, 193, 16, 16, 16 };
lzw.Compress(input, output);
byte[] result = output.ToArray();
CollectionAssert.AreEqual(expected, result);
}
public void TestLZW()
{
Random r = new Random();
StringBuilder testStr = new StringBuilder();
for (int i = 0; i < 1000000; ++i)
{
testStr.Append(((char)r.Next(32, 126)));
}
byte[] inputBytes = Encoding.ASCII.GetBytes(testStr.ToString());
byte[] compressed = LZW.Compress(testStr.ToString());
string decompressedStr = LZW.Decompress(compressed);
//string decompressedStr = Encoding.ASCII.GetString(decompressedBytes);
//CollectionAssert.AreEqual(inputBytes, decompressedBytes);
Assert.AreEqual(testStr.ToString(), decompressedStr);
}
public async Task <ActionResult> Compress(string name, [FromForm] IFormFile file)
{
string path = _env.ContentRootPath;
string OriginalName = file.FileName;
string uploadPath = path + @"\Uploads\" + OriginalName;
string downloadPath = path + @"\Compressions\" + name;
byte[] FileBytes;
double originalSize;
try
{
if (file != null)
{
using (FileStream fs = System.IO.File.Create(uploadPath))
{
await file.CopyToAsync(fs);
originalSize = fs.Length;
}
LZW Compressor = new LZW(uploadPath);
FileBytes = Compressor.Compress(uploadPath, OriginalName, 100);
double compressedSize = FileBytes.Length;
Compressor.UpdateCompressions(path, OriginalName, uploadPath, originalSize, compressedSize);
return(File(FileBytes, "text/plain", name + ".lzw"));
}
else
{
return(StatusCode(500));
}
}
catch (Exception)
{
return(StatusCode(500));
}
}
