public void EncodeDecodeBaseN()
{
byte testByte = 157;
List<byte> bytes = new List<byte>();
for (uint radix = 2; radix < 1000; radix++)
{
var baseN = new BaseN(StringGenerator.GetAlphabet((int)radix), 64);
int testBytesCount = Math.Max((baseN.BlockBitsCount + 7) / 8, (int)baseN.BlockCharsCount);
bytes.Clear();
for (int i = 0; i <= testBytesCount + 1; i++)
{
var array = bytes.ToArray();
var encoded = baseN.Encode(array);
var decoded = baseN.Decode(encoded);
CollectionAssert.AreEqual(array, decoded);
bytes.Add(testByte);
}
}
}
public void EncodeDecodeBaseN()
{
byte testByte = 157;
List <byte> bytes = new List <byte>();
for (uint radix = 2; radix < 1000; radix++)
{
var baseN = new BaseN(StringGenerator.GetAlphabet((int)radix), 64);
int testBytesCount = Math.Max((baseN.BlockBitsCount + 7) / 8, (int)baseN.BlockCharsCount);
bytes.Clear();
for (int i = 0; i <= testBytesCount + 1; i++)
{
var array = bytes.ToArray();
var encoded = baseN.Encode(array);
var decoded = baseN.Decode(encoded);
CollectionAssert.AreEqual(array, decoded);
bytes.Add(testByte);
}
}
}
private void button2_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
Stream FStream = null;
openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "txt files (*.txt)|*.txt";
openFileDialog1.FilterIndex = 2;
openFileDialog1.RestoreDirectory = true;
// Составляем таблицы для прямого и обратного преобразования
byte cod = 0;
char sumbol = 'А';
for (int i = 0; i < 16; i++)
{
Table.Add(cod, sumbol); // Ключ - бит, значение - символ
InvTable.Add(sumbol, cod); // Ключ - символ, значение - бит
cod++;
sumbol++;
}
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
try
{
if ((FStream = openFileDialog1.OpenFile()) != null)
{
}
}
catch (Exception ex)
{
MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
}
}
Stream fs = openFileDialog1.OpenFile();
byte[] DecBytes = new byte[fs.Length - 3];
BinaryReader BinReader = new BinaryReader(fs);
while (fs.Position < fs.Length)
{
if (fs.Position < 3)
{
BinReader.ReadByte();
continue;
}
DecBytes[fs.Position - 3] = (byte)(BinReader.ReadByte());
}
BinReader.Close();
fs.Close();
//Получаем строку и удаляем из нее символы форматирования
string Log_txt = Encoding.UTF8.GetString(DecBytes, 0, DecBytes.Length);
Log_txt = Log_txt.Replace("\n", "");
Log_txt = Log_txt.Replace(" ", "");
string strHash = Log_txt.Substring(0, 26);
var refDec = Log_txt.Substring(26, Log_txt.Length - 26);
BaseN triOd = new BaseN();
byte[] alf = triOd.Decode(refDec);
/*// Обратное преобразование
* foreach (char letter in Log_txt)
* {
* Bytes.Add(InvTable[letter]); // Создаем список полубайт
* }
* byte[] WrtBytes = new byte[Bytes.Count()/2];
* for (int i = 0; i < Bytes.Count(); i += 2)
* {
* byte buf = (byte)((Bytes[i] << 4) + (Bytes[i+1])); // Складываем два полубайта в байт
* WrtBytes[i / 2] = buf;
* }
*/
progressBar1.Minimum = 0;
progressBar1.Maximum = 100;
progressBar1.Value = 0;
for (int i = 0; i < 100; i++)
{
progressBar1.Value++;
System.Threading.Thread.Sleep(12);
}
System.Threading.Thread.Sleep(400);
Stream FWStream;
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.Filter = "ENC files (*.ENC)|*.ENC";
saveFileDialog1.FilterIndex = 2;
saveFileDialog1.RestoreDirectory = true;
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
if ((FWStream = saveFileDialog1.OpenFile()) != null)
{
BinaryWriter BinWriter = new BinaryWriter(FWStream);
BinWriter.Write(alf);
BinWriter.Close();
FWStream.Close();
}
}
byte[] md5Hash = ComputeMD5Checksum(saveFileDialog1.FileName);
BaseN Hachcod = new BaseN();
if (strHash != Hachcod.Encode(md5Hash))
{
MessageBox.Show("Файл поврежден. Хэш суммы не равны!!!");
}
//progressBar1.Value = 0;
Table.Clear();
InvTable.Clear();
}