public void EmptyAlphabetNonEmptyStringDecryptionTest()
{
string empty = string.Empty;
var unzipper = new LZWDecompress(empty);
unzipper.Decrypt("0");
}
public byte[] Decode(byte[] content)
{
var lzw = new LZWDecompress();
var input = Encoding.ASCII.GetString(content);
var output = lzw.Decompress(input);
return(output);
}
public void EmptyStringTest()
{
string empty = string.Empty;
var zipper = new LZWCompress(empty);
var zipperPT = new LZWCompressPT(empty);
var unzipper = new LZWDecompress(empty);
Assert.AreEqual(empty, zipper.Encrypt(empty));
Assert.AreEqual(empty, zipperPT.Encrypt(empty));
Assert.AreEqual(empty, unzipper.Decrypt(empty));
}
public SourceFile Run(EncodedFile encoded, string outputPath)
{
var lzwDecoder = new LZWDecompress();
var huffmanDecoder = new HuffmanDecoder(encoded.Header.HuffmanMetadata);
var bytes = encoded.Content.ToArray();
var decoded = huffmanDecoder.Decode(bytes);
var input = Encoding.ASCII.GetString(decoded);
var outLzw = lzwDecoder.Decompress(input);
return(new SourceFile(outputPath, outLzw, encoded.Header.SourceExtension));
}
private void LZWDecompressButton_Click_1(object sender, EventArgs e)
{
IFileOperationsController _fileOperationController = new FileOperationsController();
LZWDecompress _lzwDecompress = new LZWDecompress(this);
string decompressedFilePath = compressedFilePathRichTextBox.Text.Remove(compressedFilePathRichTextBox.Text.Length - 14) + "Uncompressed.txt";
decompressedFileNameTextBox.Text = decompressedFilePath;
_lzwDecompress.LZWDecompressFile(compressedFilePathRichTextBox.Text, decompressedFilePath, Convert.ToInt16(selectedMaxBitSizeTextbox.Text));
decompressedByteSizeTextBox.Text = _fileOperationController.getFileByteSize(decompressedFilePath);
compressedPercentanceTextBox.Text = _lzwDecompress.getCompressionRatio(double.Parse(compressedByteSizeTextBox.Text), double.Parse(decompressedByteSizeTextBox.Text)) + " %";
CompressedDataPercentanceTextBox.Text = (100 - Convert.ToDouble(compressedPercentanceTextBox.Text.Remove(compressedPercentanceTextBox.Text.Length - 2))).ToString() + " %";
}
public void AllStringsTest()
{
string fullAlphabet = "abcdefghijklmnopqrstuvwxyz";
int maxAlphabetLength = 12;
int maxLength = 6;
StringBuilder builder = new StringBuilder();
// For alphabets of different sizes
for (int alphabetSize = 1; alphabetSize <= maxAlphabetLength; ++alphabetSize)
{
string alphabet = fullAlphabet.Substring(0, alphabetSize);
var zipper = new LZWCompress(alphabet);
var zipperPT = new LZWCompressPT(alphabet);
var unzipper = new LZWDecompress(alphabet);
// For strings in current alphabet of different size
for (int strlen = 0; strlen <= maxLength; ++strlen)
{
// Number of all possible strings in current alphabet of current size
int strings = (int)Math.Pow(alphabet.Length, strlen);
for (int i = 0; i < strings; ++i)
{
builder.Clear();
int mask = i;
for (int shift = 0; shift < strlen; ++shift)
{
builder.Append(alphabet[mask % alphabet.Length]);
mask >>= 1;
}
string message = builder.ToString();
string encrypted = zipper.Encrypt(message);
string encryptedPT = zipperPT.Encrypt(message);
Assert.AreEqual(encrypted, encryptedPT);
Assert.AreEqual(message, unzipper.Decrypt(encrypted));
}
}
}
}
