private double GetPpmdCompressionRatio <T>(string toUncompressedPath, IEnumerable <T> data)
{
//write uncompressed
IFileWriter fWriter = new FileWriter(toUncompressedPath);
fWriter.WriteText(data);
//var data = BinaryConverter.ToBinArray(day.Data);
//BinaryFileWriter.Write(toUncompressedPath, FileMode.CreateNew, data);
//compress
IArchiver archiver = new PPMDArchiver();
var toBeEncodedFileInfo = new FileInfo(toUncompressedPath);
string encodedPath = archiver.Compress(toBeEncodedFileInfo);
var fiUncompressed = new FileInfo(toUncompressedPath);
var fiCompressed = new FileInfo(encodedPath);
//compression rate
double rate = (double)fiUncompressed.Length / fiCompressed.Length;
//remove the files
fiUncompressed.Delete();
fiCompressed.Delete();
return(rate);
}
private IArchiver GetArchiver(CompressionType type)
{
IArchiver compressor;
switch (type)
{
case CompressionType.Gzip:
{
compressor = new GZipArchiver();
break;
}
case CompressionType.Lzma:
{
compressor = new LZMAArchiver();
break;
}
case CompressionType.Ppmd:
{
compressor = new PPMDArchiver();
break;
}
default:
throw new NotSupportedException();
}
return(compressor);
}
public void CompressDecompressWithPPMDTest()
{
string toBeEncodedPath = "file.txt";
string str = "012";
var sb = new StringBuilder();
for (int i = 0; i < 100; i++)
{
sb.Append(str);
}
string expectedContent = sb.ToString();
File.WriteAllText(toBeEncodedPath, expectedContent, Encoding.ASCII);
var toBeEncodedFileInfo = new FileInfo(toBeEncodedPath);
IArchiver archiver = new PPMDArchiver();
string encodedPath = archiver.Compress(toBeEncodedFileInfo);
var encodedFileInfo = new FileInfo(encodedPath);
Assert.IsTrue(File.Exists(encodedPath));
Assert.IsTrue(encodedFileInfo.Length == 122);
File.Delete(toBeEncodedPath);
//DECODE
string decodedPath = archiver.Decompress(encodedFileInfo);
Assert.IsTrue(File.Exists(decodedPath));
string actualContent = File.ReadAllText(decodedPath);
Assert.IsTrue(actualContent.Length == 300);
Assert.AreEqual(expectedContent, expectedContent);
}
public void PPMZArchiver_Compress()
{
string toBeEncodedPath = "file.txt";
string str = "012";
var sb = new StringBuilder();
for (int i = 0; i < 100; i++)
{
sb.Append(str);
}
string expectedContent = sb.ToString();
File.WriteAllText(toBeEncodedPath, expectedContent, Encoding.ASCII);
var toBeEncodedFileInfo = new FileInfo(toBeEncodedPath);
IArchiver archiver = new PPMDArchiver();
string encodedPath = archiver.Compress(toBeEncodedFileInfo);
var encodedFileInfo = new FileInfo(encodedPath);
Assert.IsTrue(File.Exists(encodedPath));
Assert.IsTrue(encodedFileInfo.Length == 122);
}
