private void StartDecode()
{
var file = _list.GetRange(0, 1).First(); //Get the nzbImport at the index found above
_list.RemoveAt(0);
file.Status = NzbFileStatus.Decoding;
FileStream output = null;
StreamReader input = null;
string line;
string decoder = "";
string sdecoder = "";
string outputfile = "";
long outputsize = -1;
bool crcfailed = false;
Crc32Helper crc = new Crc32Helper();
int decodedsegments = 0;
foreach (NzbSegmentModel segment in file.Segments)
{
if (segment.Storage == null) //Make sure Storage isn't null... Null Exception Avoidance
{
continue;
}
// Check if the storage is 0 (It will be empty then)
if (segment.Storage.Length == 0)
{
continue;
}
input = new StreamReader(segment.Storage, Encoding.GetEncoding("iso-8859-1"));
// If uudecode is used, each file is automaticly a new segment
if (decoder == "uudecode" || (decoder == "mime" && sdecoder == "base64"))
{
decodedsegments++;
}
line = input.ReadLine();
while (line != null)
{
if (decoder == "mime")
{
if (line.StartsWith("Content-Transfer-Encoding:"))
{
sdecoder = line.Remove(0, 27);
}
if (line.StartsWith("--=") || line.StartsWith("Content-Type:"))
{
decoder = "";
sdecoder = "";
outputfile = "";
output.Close();
output = null;
}
// Perhaps get filename out of this, but its also in the content type
if (line.StartsWith("Content-Disposition:"))
{
line = "";
}
if (sdecoder == "base64")
{
if (line.Length % 4 > 0)
{
line = "";
}
if (line != "")
{
byte[] buffer;
buffer = Convert.FromBase64String(line);
output.Write(buffer, 0, buffer.Length);
}
}
}
if (decoder == "uudecode")
{
if (line != "" && line != "end")
{
char[] buffer = line.ToCharArray();
if (uudecode_checkline(buffer))
{
int p = 0;
int n = 0;
byte ch;
n = uudecode_dec(buffer[p]);
for (++p; n > 0; p += 4, n -= 3)
{
if (n >= 3)
{
// Error ?
if (!(uudecode_is_dec(buffer[p]) && uudecode_is_dec(buffer[p + 1]) && uudecode_is_dec(buffer[p + 2]) && uudecode_is_dec(buffer[p + 3])))
{
throw new Exception("33");
}
ch = (byte)(uudecode_dec(buffer[p + 0]) << 2 | uudecode_dec(buffer[p + 1]) >> 4);
output.WriteByte(ch);
ch = (byte)(uudecode_dec(buffer[p + 1]) << 4 | uudecode_dec(buffer[p + 2]) >> 2);
output.WriteByte(ch);
ch = (byte)(uudecode_dec(buffer[p + 2]) << 6 | uudecode_dec(buffer[p + 3]));
output.WriteByte(ch);
}
else
{
if (n >= 1)
{
if (!(uudecode_is_dec(buffer[p]) && uudecode_is_dec(buffer[p + 1])))
{
throw new Exception("34");
}
ch = (byte)(uudecode_dec(buffer[p + 0]) << 2 | uudecode_dec(buffer[p + 1]) >> 4);
output.WriteByte(ch);
}
if (n >= 2)
{
if (!(uudecode_is_dec(buffer[p + 1]) && uudecode_is_dec(buffer[p + 2])))
{
throw new Exception("35");
}
ch = (byte)(uudecode_dec(buffer[p + 1]) << 4 | uudecode_dec(buffer[p + 2]) >> 2);
output.WriteByte(ch);
}
if (n >= 3)
{
if (!(uudecode_is_dec(buffer[p + 2]) && uudecode_is_dec(buffer[p + 3])))
{
throw new Exception("36");
}
ch = (byte)(uudecode_dec(buffer[p + 2]) << 6 | uudecode_dec(buffer[p + 3]));
output.WriteByte(ch);
}
}
}
}
}
if (line == "end")
{
decoder = "";
outputfile = "";
output.Close();
output = null;
}
}
if (decoder == "yenc")
{
if (line.StartsWith("=ypart "))
{
// Part description
string[] ypart = line.Split(" ".ToCharArray());
foreach (string s in ypart)
{
if (s.StartsWith("begin"))
{
output.Seek(long.Parse(s.Remove(0, 6)) - 1, SeekOrigin.Begin);
}
}
}
else
{
if (line.StartsWith("=yend "))
{
// End of the Yenc part, do CRC check
decoder = "";
string[] yend = line.Split(" ".ToCharArray());
foreach (string s in yend)
{
if (s.StartsWith("pcrc32"))
{
long opcrc = Convert.ToInt64(s.Remove(0, 7), 16);
long cpcrc = crc.EndByteCRC();
if (opcrc != cpcrc)
{
crcfailed = true;
}
}
}
decodedsegments++;
if (outputsize == output.Length)
{
outputsize = -1;
}
if (outputsize == -1)
{
output.Close();
output = null;
outputfile = "";
}
}
else
{
// Yenc Encoded part
bool escape = false;
if (line.StartsWith(".."))
{
line = line.Remove(0, 1);
}
foreach (char c in line.ToCharArray())
{
if (c == '=' && !escape)
{
escape = true;
}
else
{
byte nc = (byte)c;
if (escape)
{
nc = (byte)(nc - 64);
escape = false;
}
nc = (byte)(nc - 42);
output.WriteByte(nc);
crc.AddByteCRC(nc);
}
}
}
}
}
if (decoder == "")
{
if (line.StartsWith("=ybegin "))
{
decoder = "yenc";
crc.StartByteCRC();
// Check if its a valid ybegin line, as per 1.2 line, size and name have to be present
if (line.IndexOf("line=") != -1 && line.IndexOf("size=") != -1 && line.IndexOf("name=") != -1)
{
int b, e;
b = line.IndexOf("size=");
e = line.IndexOf(" ", b);
outputsize = long.Parse(line.Substring(b + 5, e - b - 5));
b = line.IndexOf("name=");
if (outputfile != line.Substring(b + 5))
{
outputfile = line.Substring(b + 5);
if (file.Filename == "")
{
file.Filename = outputfile;
}
//why add second filename?
//article.Filename = article.Filename + outputfile;
//string path = GetDirectory(article);
try
{
if (!_disk.FolderExists(Path.GetFullPath(file.Path)))
{
_disk.CreateDirectory(Path.GetFullPath(file.Path));
}
}
catch (Exception ex)
{
Logger.ErrorException("Unable to create directory [" + file.Path + "]", ex);
}
if (output != null)
{
output.Close();
output = null;
}
output = new FileStream(Path.GetFullPath(file.Path) + "\\" + outputfile, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None, 1024 * 1024);
}
}
}
if (line.StartsWith("begin 644 "))
{
decodedsegments++;
decoder = "uudecode";
outputfile = line.Remove(0, 10);
if (file.Filename == "")
{
file.Filename = outputfile;
}
//why add second file name?
//article.Filename = article.Filename + outputfile;
//string path = GetDirectory(article);
try
{
if (!_disk.FolderExists(Path.GetFullPath(file.Path)))
{
_disk.CreateDirectory(Path.GetFullPath(file.Path));
}
}
catch (Exception ex)
{
throw (ex);
}
if (output != null)
{
output.Close();
output = null;
}
output = new FileStream(Path.GetFullPath(file.Path) + "\\" + outputfile, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None, 1024 * 1024);
}
if (line.StartsWith("Content-Type: application/octet-stream;"))
{
decodedsegments++;
decoder = "mime";
sdecoder = "";
outputfile = line.Substring(line.IndexOf("name=") + 5);
if (outputfile[0] == '\"' && outputfile[outputfile.Length - 1] == '\"')
{
outputfile = outputfile.Substring(1, outputfile.Length - 2);
}
if (outputfile[0] == '\'' && outputfile[outputfile.Length - 1] == '\'')
{
outputfile = outputfile.Substring(1, outputfile.Length - 2);
}
if (file.Filename == "")
{
file.Filename = outputfile;
}
//why add second file name?
//article.Filename = article.Filename + outputfile;
//string path = GetDirectory(article);
try
{
if (!_disk.FolderExists(Path.GetFullPath(file.Path)))
{
_disk.CreateDirectory(Path.GetFullPath(file.Path));
}
}
catch (Exception ex)
{
//frmMain.LogWriteError("Unable to create directory [" + path + "]");
throw (ex);
}
if (output != null)
{
output.Close();
output = null;
}
output = new FileStream(Path.GetFullPath(file.Path) + "\\" + outputfile, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None, 1024 * 1024);
}
}
line = input.ReadLine();
}
input.Close();
input = null;
if (output != null)
{
output.Flush();
}
segment.Status = NzbSegmentStatus.Decoded;
segment.Storage.Close();
segment.Storage = null; //Clear out the MemoryStream so we get our RAM back
}
if (output != null)
{
output.Close();
output = null;
}
if (crcfailed || decodedsegments == 0)
{
file.Status = NzbFileStatus.DecodeFailed;
return;
}
file.Status = NzbFileStatus.Decoded; //File Decoded Properly
return;
}
