public InnerFile(InnerFileHeader header, byte[] encryptionHeader, byte[] symCodeTable, byte[] data)
{
this.header = header;
this.encryptionHeader = encryptionHeader;
this.symCodeTable = symCodeTable;
this.data = data;
}
private InnerFile TxtToInnerFile(byte[] file, string filename)
{
// заполнение сигнатуры
// UTF8 signature EF BB BF <--> 239 187 191
InnerFileHeader innerFileHeader = new InnerFileHeader();
//innerFileHeader.signature[0] = 0;
//innerFileHeader.signature[1] = 239;
//innerFileHeader.signature[2] = 187;
//innerFileHeader.signature[3] = 191;
// размер файла
innerFileHeader.uncompressedSize = BitConverter.GetBytes(file.Length);
// заполнение имени и длины имени
byte[] byteFileName = Encoding.UTF8.GetBytes(filename);
innerFileHeader.fileNameLength = BitConverter.GetBytes(byteFileName.Length)[0];
for (int i = 0; i < innerFileHeader.fileNameLength; i++)
{
innerFileHeader.fileName[i] = byteFileName[i];
}
// ВРЕМЕННО заполнение смещения данных
innerFileHeader.fileDataOffset = BitConverter.GetBytes(InnerFileHeader.size);
return(new InnerFile(innerFileHeader, null, null, file));
}
/// РАСШИФРОВКА ЗДЕСЬ!!! VVV
private VSAS BytesToVSAS(byte[] file)
{
//VSAS archive = new VSAS();
VSAS_Header archiveHeader = new VSAS_Header();
List <InnerFile> innerFiles = new List <InnerFile>();
int counter = 4;
archiveHeader.algNumEntropyCompression = file[counter];
counter++;
archiveHeader.algNumContextCompression = file[counter];
counter++;
archiveHeader.algNumNoiseProtection = file[counter];
counter++;
archiveHeader.algNumEncryption = file[counter];
counter++;
archiveHeader.filesAmount = file[counter];
counter++;
archiveHeader.tail = file.Skip(counter).Take(7).ToArray();
counter += 7;
for (int i = 0; i < archiveHeader.filesAmount; i++)
{
InnerFileHeader innerFileHeader = new InnerFileHeader();
innerFileHeader.signature = file.Skip(counter).Take(4).ToArray();
counter += 4;
innerFileHeader.compressedSize = file.Skip(counter).Take(4).ToArray();
counter += 4;
innerFileHeader.uncompressedSize = file.Skip(counter).Take(4).ToArray();
counter += 4;
innerFileHeader.fileNameLength = file[counter];
counter++;
innerFileHeader.symTableOffset = file.Skip(counter).Take(4).ToArray();
counter += 4;
innerFileHeader.fileDataOffset = file.Skip(counter).Take(4).ToArray();
counter += 4;
innerFileHeader.fileName = file.Skip(counter).Take(104).ToArray();
counter += 104;
innerFileHeader.tail = file.Skip(counter).Take(3).ToArray();
counter += 3;
byte[] encryptionHeader = null;
if (archiveHeader.algNumEncryption == 1)
{
int len = BitConverter.ToInt32(innerFileHeader.symTableOffset, 0);
encryptionHeader = file.Skip(counter).Take(len).ToArray();
counter += len;
}
byte[] symCodeTable = null;
if (archiveHeader.algNumContextCompression == 1)
{
int len = BitConverter.ToInt32(innerFileHeader.fileDataOffset, 0);
symCodeTable = file.Skip(counter).Take(len).ToArray();
counter += len;
}
Dictionary <string, byte> codeSym = new Dictionary <string, byte>();
// формирование таблицы кодов в виде словаря
if (archiveHeader.algNumContextCompression == 1)
{
int scCounter = 0;
while (scCounter < symCodeTable.Length)
{
byte sym = symCodeTable.Skip(scCounter).Take(1).ToArray()[0];
scCounter++;
int len = symCodeTable.Skip(scCounter).Take(1).ToArray()[0];
scCounter++;
byte[] code = symCodeTable.Skip(scCounter).Take(len).ToArray();
scCounter += len;
string strcode = "";
foreach (byte b in code)
{
strcode += (char)b;
}
codeSym.Add(strcode, sym);
}
}
int dataSize = 0;
byte[] data = null;
byte[] uncompressedData = null;
int uncompressedDataCounter = 0;
//Расшифровка Фано РАЗЖАТИЕ :)
if (archiveHeader.algNumContextCompression == 1)
{
List <byte> uncompressedDataList = new List <byte>();
dataSize = BitConverter.ToInt32(innerFileHeader.compressedSize, 0);
BitArray bits = new BitArray(file.Skip(counter).Take(dataSize).ToArray());
counter += dataSize;
string code = "";
foreach (bool bit in bits)
{
if (bit == true)
{
code += '1';
}
else
{
code += '0';
}
if (codeSym.ContainsKey(code))
{
uncompressedDataList.Add(codeSym[code]);
code = "";
}
}
innerFileHeader.compressedSize = BitConverter.GetBytes(uncompressedDataList.Count);
uncompressedData = uncompressedDataList.ToArray();
}
else if (archiveHeader.algNumContextCompression == 2)
{
List <byte> newData = new List <byte>();
dataSize = BitConverter.ToInt32(innerFileHeader.compressedSize, 0);
List <byte> oldData = new List <byte>();
oldData.AddRange(file.Skip(counter).Take(dataSize).ToArray());
counter += dataSize;
for (int c = 0; c < oldData.Count; c++)
{
if (oldData[c] == (byte)'^')
{
int amount = oldData[c + 1];
byte b = oldData[c + 2];
for (int c2 = 0; c2 < amount; c2++)
{
newData.Add(b);
}
c += 2;
}
else
{
newData.Add(oldData[c]);
}
}
data = newData.ToArray();
}
if (archiveHeader.algNumEncryption == 1)
{/// РАСШИФРОВКА ДАННЫХ
List <byte> encryptedData = new List <byte>();
dataSize = BitConverter.ToInt32(innerFileHeader.compressedSize, 0);
foreach (byte blockLen in encryptionHeader)
{
if (archiveHeader.algNumContextCompression != 1)
{
encryptedData.AddRange(file.Skip(counter).Take(blockLen).ToArray());
counter += blockLen + 5;
}
else
{
encryptedData.AddRange(uncompressedData.Skip(uncompressedDataCounter).Take(blockLen).ToArray());
uncompressedDataCounter += blockLen + 5;
}
}
data = encryptedData.ToArray();
}
else
{
dataSize = BitConverter.ToInt32(innerFileHeader.uncompressedSize, 0);
data = new byte[dataSize];
data = file.Skip(counter).Take(dataSize).ToArray();
counter += dataSize;
}
innerFiles.Add(new InnerFile(innerFileHeader, encryptionHeader, null, data));
}
return(new VSAS(archiveHeader, innerFiles));
}
