COMPRESSION / DECOMPRESSION A PARTIR DU SDK LZMA DE 7ZIP ( MULTI FICHIER )

Commentaire de JossGP le 29/09/2007 00:03:59

hi , sorry, but I speek a bad france even tough I read it.

Thank for your classes about LZMA. I was just looking for it.

I downloaded the zip and I tryed in my sharpdevelop environment , without modification, just to understand the logic of all pieces.( classes)
It compile fine , but when I launch the program and select a file I got an error:   Exception o type 'system.OutOfMemoryException' was thrown.

What's wrong? I noted in debug mode than this appens at these line:

  if (openFile.ShowDialog() == DialogResult.OK)
     {
       if (File.Exists(openFile.FileName))
          {  
           try
              { lzArchive.Open(openFile.FileName);
              }
           catch (Exception ex)
              {
                MessageBox.Show(ex.Message, "Erreur !", MessageBoxButtons.OK,   MessageBoxIcon.Error);
               }

Have you any suggestion about it?.
Thank for your help.
Giorgio

Commentaire de JossGP le 30/09/2007 00:20:28

Hi, after several hours , it seems I have found some problems. I want to post here if someone has the same problems I had.

1. in some circumstances this function crash.
   private void WriteLeInt16(Int16 value)
   {
     //archiveStream.WriteByte((byte)(value); --->>> crash
     archiveStream.WriteByte((byte)(value & 0xFF)); --->>> Ok!
     archiveStream.WriteByte((byte)(value >> 8));
   }
2. When you calculate the CRC and call this function:

    private void WriteCompressedSizeAndCrc(long compressedSize, uint crc32)

I don't do ...
          //WriteLeInt32((Int32)crc32); -->> this truncate the value with wrong value
I create a new function
          WriteLeUInt32(crc32);
  private void WriteLeUInt32(uint value)
  {
   uint ch;
       for (int i = 0; i < 4; i++) {
             ch = value >> (8 * i) ;
            archiveStream.WriteByte((byte)(ch & 0xFF));
       }
  }
after these little modification the class is starting to take place and I see some results. Now I go on , if I found something else I post here for other people.

Thank.
Giorgio

Commentaire de JossGP le 15/10/2007 19:33:25

Hi, Vince_02

Thank you for answer.

I want to inform you about another change i made.
    private UInt32 ReadLeUInt32()
        {
        uint Number;
        uint item;
        Number = ReadLeByte();
        for (int i = 1; i < 4; i++)
            {
                item   = ReadLeByte();
             Number =  (item << 8*i ) | Number ;
            }
            return Number;
        }
This was necessary to read correctly a UINT number without truncation.
After that all take place in the right way.

I found very interesting your idea to add an error journal ,because it can help us to check if everything is went ok. Please inform me when you have news bout it.

Giorgio