If you aren't fimiliar with D2GS.dll this topic probally isnt for you...

I was wondering if anyone wanted to undergo the process of creating a recompression algorithum for D2GS because I suck at C++ (hard) and i converted the D2GS.dll to vb and vb was like "OMG ROFL YOU SUCK NEWBIE" and i was like ":("

Hmm... and because im full of love i have 9$ on my paypal I'm never going to use if you write it :D ill send you 9$ :D

Last time I check, 1.11 did not change the decompression algoithum..mine still works fine(using D2GS.dll which Ringo created).

You should use his dll. No need to convert to VB.

[quote author=Infamous link=topic=12692.msg126676#msg126676 date=1125690211]
Last time I check, 1.11 did not change the decompression algoithum..mine still works fine(using D2GS.dll which Ringo created).

You should use his dll. No need to convert to VB.
[/quote]

Thats alright i found compression and decompression code on pscode

If anyone wants it ill gladly send you it..

E-mail to HdxBmx27@gmail.com or jsut post here.
~-~(HDX)~-~

I am sorry i was running the wrong command on the wrong variable :'( it isnt working although from what i understand lived krad is making a class module for compression :D ...

what kind of compression and decompression are you talking about?  MPQ?

[quote author=Sorc.Polgara link=topic=12692.msg127859#msg127859 date=1126534808]
what kind of compression and decompression are you talking about?  MPQ?
[/quote]

No, the D2 Game Server protocol involves compression on each packet.

[code]//----------------------------------------------------------------------
// Packet Decompression Tables
//----------------------------------------------------------------------

unsigned int CharIndex[] = {
  0x0247, 0x0236, 0x0225, 0x0214, 0x0203, 0x01F2, 0x01E1, 0x01D0,
  0x01BF, 0x01AE, 0x019D, 0x018C, 0x017B, 0x016A, 0x0161, 0x0158,
  0x014F, 0x0146, 0x013D, 0x0134, 0x012B, 0x0122, 0x0119, 0x0110,
  0x0107, 0x00FE, 0x00F5, 0x00EC, 0x00E3, 0x00DA, 0x00D1, 0x00C8,
  0x00BF, 0x00B6, 0x00AD, 0x00A8, 0x00A3, 0x009E, 0x0099, 0x0094,
  0x008F, 0x008A, 0x0085, 0x0080, 0x007B, 0x0076, 0x0071, 0x006C,
  0x0069, 0x0066, 0x0063, 0x0060, 0x005D, 0x005A, 0x0057, 0x0054,
  0x0051, 0x004E, 0x004B, 0x0048, 0x0045, 0x0042, 0x003F, 0x003F,
  0x003C, 0x003C, 0x0039, 0x0039, 0x0036, 0x0036, 0x0033, 0x0033,
  0x0030, 0x0030, 0x002D, 0x002D, 0x002A, 0x002A, 0x0027, 0x0027,
  0x0024, 0x0024, 0x0021, 0x0021, 0x001E, 0x001E, 0x001B, 0x001B,
  0x0018, 0x0018, 0x0015, 0x0015, 0x0012, 0x0012, 0x0012, 0x0012,
  0x000F, 0x000F, 0x000F, 0x000F, 0x000C, 0x000C, 0x000C, 0x000C,
  0x0009, 0x0009, 0x0009, 0x0009, 0x0006, 0x0006, 0x0006, 0x0006,
  0x0003, 0x0003, 0x0003, 0x0003, 0x0003, 0x0003, 0x0003, 0x0003,
  0x0003, 0x0003, 0x0003, 0x0003, 0x0003, 0x0003, 0x0003, 0x0003,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000
};


unsigned char CharTable[] = {
  0x00,0x00,0x01,0x00,0x01,0x04,0x00,0xFF,0x06,0x00,0x14,0x06,
  0x00,0x13,0x06,0x00,0x05,0x06,0x00,0x02,0x06,0x00,0x80,0x07,
  0x00,0x6D,0x07,0x00,0x69,0x07,0x00,0x68,0x07,0x00,0x67,0x07,
  0x00,0x1E,0x07,0x00,0x15,0x07,0x00,0x12,0x07,0x00,0x0D,0x07,
  0x00,0x0A,0x07,0x00,0x08,0x07,0x00,0x07,0x07,0x00,0x06,0x07,
  0x00,0x04,0x07,0x00,0x03,0x07,0x00,0x6C,0x08,0x00,0x51,0x08,
  0x00,0x20,0x08,0x00,0x1F,0x08,0x00,0x1D,0x08,0x00,0x18,0x08,
  0x00,0x17,0x08,0x00,0x16,0x08,0x00,0x11,0x08,0x00,0x10,0x08,
  0x00,0x0F,0x08,0x00,0x0C,0x08,0x00,0x0B,0x08,0x00,0x09,0x08,
  0x01,0x96,0x09,0x97,0x09,0x01,0x90,0x09,0x95,0x09,0x01,0x64,
  0x09,0x6B,0x09,0x01,0x62,0x09,0x63,0x09,0x01,0x56,0x09,0x58,
  0x09,0x01,0x52,0x09,0x55,0x09,0x01,0x4D,0x09,0x50,0x09,0x01,
  0x45,0x09,0x4C,0x09,0x01,0x40,0x09,0x43,0x09,0x01,0x31,0x09,
  0x3B,0x09,0x01,0x28,0x09,0x30,0x09,0x01,0x1A,0x09,0x25,0x09,
  0x01,0x0E,0x09,0x19,0x09,0x02,0xE2,0x0A,0xE8,0x0A,0xF0,0x0A,
  0xF8,0x0A,0x02,0xC0,0x0A,0xC2,0x0A,0xCE,0x0A,0xE0,0x0A,0x02,
  0xA0,0x0A,0xA2,0x0A,0xB0,0x0A,0xB8,0x0A,0x02,0x8A,0x0A,0x8F,
  0x0A,0x93,0x0A,0x98,0x0A,0x02,0x81,0x0A,0x82,0x0A,0x83,0x0A,
  0x89,0x0A,0x02,0x7C,0x0A,0x7D,0x0A,0x7E,0x0A,0x7F,0x0A,0x02,
  0x77,0x0A,0x78,0x0A,0x79,0x0A,0x7A,0x0A,0x02,0x73,0x0A,0x74,
  0x0A,0x75,0x0A,0x76,0x0A,0x02,0x6E,0x0A,0x6F,0x0A,0x70,0x0A,
  0x72,0x0A,0x02,0x61,0x0A,0x65,0x0A,0x66,0x0A,0x6A,0x0A,0x02,
  0x5D,0x0A,0x5E,0x0A,0x5F,0x0A,0x60,0x0A,0x02,0x57,0x0A,0x59,
  0x0A,0x5A,0x0A,0x5B,0x0A,0x02,0x4A,0x0A,0x4B,0x0A,0x4E,0x0A,
  0x53,0x0A,0x02,0x46,0x0A,0x47,0x0A,0x48,0x0A,0x49,0x0A,0x02,
  0x3F,0x0A,0x41,0x0A,0x42,0x0A,0x44,0x0A,0x02,0x3A,0x0A,0x3C,
  0x0A,0x3D,0x0A,0x3E,0x0A,0x02,0x36,0x0A,0x37,0x0A,0x38,0x0A,
  0x39,0x0A,0x02,0x32,0x0A,0x33,0x0A,0x34,0x0A,0x35,0x0A,0x02,
  0x2B,0x0A,0x2C,0x0A,0x2D,0x0A,0x2E,0x0A,0x02,0x26,0x0A,0x27,
  0x0A,0x29,0x0A,0x2A,0x0A,0x02,0x21,0x0A,0x22,0x0A,0x23,0x0A,
  0x24,0x0A,0x03,0xFB,0x0B,0xFC,0x0B,0xFD,0x0B,0xFE,0x0B,0x1B,
  0x0A,0x1B,0x0A,0x1C,0x0A,0x1C,0x0A,0x03,0xF2,0x0B,0xF3,0x0B,
  0xF4,0x0B,0xF5,0x0B,0xF6,0x0B,0xF7,0x0B,0xF9,0x0B,0xFA,0x0B,
  0x03,0xE9,0x0B,0xEA,0x0B,0xEB,0x0B,0xEC,0x0B,0xED,0x0B,0xEE,
  0x0B,0xEF,0x0B,0xF1,0x0B,0x03,0xDE,0x0B,0xDF,0x0B,0xE1,0x0B,
  0xE3,0x0B,0xE4,0x0B,0xE5,0x0B,0xE6,0x0B,0xE7,0x0B,0x03,0xD6,
  0x0B,0xD7,0x0B,0xD8,0x0B,0xD9,0x0B,0xDA,0x0B,0xDB,0x0B,0xDC,
  0x0B,0xDD,0x0B,0x03,0xCD,0x0B,0xCF,0x0B,0xD0,0x0B,0xD1,0x0B,
  0xD2,0x0B,0xD3,0x0B,0xD4,0x0B,0xD5,0x0B,0x03,0xC5,0x0B,0xC6,
  0x0B,0xC7,0x0B,0xC8,0x0B,0xC9,0x0B,0xCA,0x0B,0xCB,0x0B,0xCC,
  0x0B,0x03,0xBB,0x0B,0xBC,0x0B,0xBD,0x0B,0xBE,0x0B,0xBF,0x0B,
  0xC1,0x0B,0xC3,0x0B,0xC4,0x0B,0x03,0xB2,0x0B,0xB3,0x0B,0xB4,
  0x0B,0xB5,0x0B,0xB6,0x0B,0xB7,0x0B,0xB9,0x0B,0xBA,0x0B,0x03,
  0xA9,0x0B,0xAA,0x0B,0xAB,0x0B,0xAC,0x0B,0xAD,0x0B,0xAE,0x0B,
  0xAF,0x0B,0xB1,0x0B,0x03,0x9F,0x0B,0xA1,0x0B,0xA3,0x0B,0xA4,
  0x0B,0xA5,0x0B,0xA6,0x0B,0xA7,0x0B,0xA8,0x0B,0x03,0x92,0x0B,
  0x94,0x0B,0x99,0x0B,0x9A,0x0B,0x9B,0x0B,0x9C,0x0B,0x9D,0x0B,
  0x9E,0x0B,0x03,0x86,0x0B,0x87,0x0B,0x88,0x0B,0x8B,0x0B,0x8C,
  0x0B,0x8D,0x0B,0x8E,0x0B,0x91,0x0B,0x03,0x2F,0x0B,0x4F,0x0B,
  0x54,0x0B,0x5C,0x0B,0x71,0x0B,0x7B,0x0B,0x84,0x0B,0x85,0x0B
};

unsigned int BitMasks[] = {
  0x0000,0x0001,0x0003,0x0007,0x000F,0x001F,0x003F,0x007F,
  0x00FF,0x01FF,0x03FF,0x07FF,0x0FFF,0x1FFF,0x3FFF,0x7FFF
};

//----------------------------------------------------------------------
// GamePacketSize
//  Calculates the size of a compressed game packet.
// 
// data: [in] pointer to received packet
// size: [out] pointer to size
// returns: the offset to the data.
//----------------------------------------------------------------------

unsigned char *GamePacketSize(unsigned char *data, unsigned int *size,
                            unsigned int *offset)
{
  unsigned int a;

  if (data[0] < 0xF0) {
      *size = data[0] - 1;
      *offset = 1;
      return &data[1];
  }

  a = (data[0] & 0xF) << 8;
  *size = a + data[1] - 2;
  *offset = 2;
  return &data[2];
}

//----------------------------------------------------------------------
// GamePacketDecode
//  Decompress a d2gs packet into data.
//  Note: packets come in clumps. A single compressed packet may have
//  several game packets, and its up to you to figure it out.
//
// indata: [in] compressed packet (without size byte)
// insize: [in] length of indata
// outdata: [out] output buffer
// outmax: [in] size of output buffer
// outsize: [out] location to store size of decoded data
// returns: 1 on successf decode, 0 if not enough room
//----------------------------------------------------------------------

int GamePacketDecode(unsigned char *indata, unsigned int insize,
                    unsigned char *outdata, unsigned int outmax,
                    unsigned int *outsize)
{
  unsigned int a, b, c, d;
  unsigned int maxcnt, index, cnt;
  unsigned char *outptr, *inptr;
  int size;

  b = 0;

  size = insize;
  inptr = indata;

  maxcnt = outmax;
  outptr = outdata;
  cnt = 0x20;

  while (1) {

      if (cnt >= 0x8) {
          while (size > 0 && cnt >= 8) {
              cnt -= 0x8;
              size--;
              a = *inptr++ << cnt;
              b |= a;
          };
      }

      index = CharIndex[b >> 0x18];
      a = CharTable[index];
      d = (b >> (0x18 - a)) & BitMasks[a];
      c = CharTable[index + 2*d + 2];

      cnt += c;
      if (cnt > 0x20) {
          *outsize = outmax - maxcnt;
          return 1;
      }

      if (maxcnt-- == 0)
          return 0;

      a = CharTable[index + 2*d + 1];
      *outptr++ = (unsigned char)a;

      b <<= (c & 0xFF);
  }

  assert(0);
  return 0;
}[/code]

[Kp edit: switched the post from a block of quote to a block of code.  Really, I'm surprised NetNX didn't know better.  He's been here long enough.]

Use a code block instead of quote or disable smileys for the best results when posting code.

[quote author=NetNX link=topic=12692.msg127867#msg127867 date=1126547796]
//----------------------------------------------------------------------
// Packet Decompression Tables
//----------------------------------------------------------------------
...
[/quote]

It's rude to not give credit

[quote author=UserLoser link=topic=12692.msg127880#msg127880 date=1126556625]
[quote author=NetNX link=topic=12692.msg127867#msg127867 date=1126547796]
//----------------------------------------------------------------------
// Packet Decompression Tables
//----------------------------------------------------------------------
...
[/quote]

It's rude to not give credit[quote][/quote]
[/quote]

That's very true.  I would of had no idea who to give credit to if you didn't post that... hehe


Ok, so I used this Depends program on the D2GS.dll that Ringo supplied with his example D2GS bot that is stickied and saw that there are only two functions GamePacketDecode() and GamePacketSize().  Now, I don't have VB6 or anything installed on my computer so I didn't open up the project.

I have a noob question...  I didn't see anything for compressing a packet... so I'm assuming that you don't need to send the D2GS packet compressed?  The reason I am asking this is because the author of the post is wanting to be able to compress a packet when it might not be required that you send the packet compressed.


EDIT:  I've never looked into D2GS.... so I don't really know it works.

C->S packets are not compressed. The author of the post is trying to re-compress packets since he's making a bnet server, not a client.