Exemple #1
0
 public int GetSymbol(SimpleZip.StreamManipulator input)
 {
     int num2;
     int index = input.PeekBits(9);
     if (index >= 0)
     {
         num2 = this.tree[index];
         if (num2 >= 0)
         {
             input.DropBits(num2 & 15);
             return (num2 >> 4);
         }
         int num3 = -(num2 >> 4);
         int n = num2 & 15;
         index = input.PeekBits(n);
         if (index >= 0)
         {
             num2 = this.tree[num3 | (index >> 9)];
             input.DropBits(num2 & 15);
             return (num2 >> 4);
         }
         int num5 = input.AvailableBits;
         index = input.PeekBits(num5);
         num2 = this.tree[num3 | (index >> 9)];
         if ((num2 & 15) <= num5)
         {
             input.DropBits(num2 & 15);
             return (num2 >> 4);
         }
         return -1;
     }
     int availableBits = input.AvailableBits;
     index = input.PeekBits(availableBits);
     num2 = this.tree[index];
     if ((num2 >= 0) && ((num2 & 15) <= availableBits))
     {
         input.DropBits(num2 & 15);
         return (num2 >> 4);
     }
     return -1;
 }
Exemple #2
0
            public bool Decode(SimpleZip.StreamManipulator input)
            {
                int num2;
                int num3;
            Label_0000:
                switch (this.mode)
                {
                    case 0:
                        this.lnum = input.PeekBits(5);
                        if (this.lnum >= 0)
                        {
                            this.lnum += 0x101;
                            input.DropBits(5);
                            this.mode = 1;
                            break;
                        }
                        return false;

                    case 1:
                        break;

                    case 2:
                        goto Label_00B9;

                    case 3:
                        goto Label_013B;

                    case 4:
                        goto Label_01A8;

                    case 5:
                        goto Label_01DE;

                    default:
                        goto Label_0000;
                }
                this.dnum = input.PeekBits(5);
                if (this.dnum < 0)
                {
                    return false;
                }
                this.dnum++;
                input.DropBits(5);
                this.num = this.lnum + this.dnum;
                this.litdistLens = new byte[this.num];
                this.mode = 2;
            Label_00B9:
                this.blnum = input.PeekBits(4);
                if (this.blnum < 0)
                {
                    return false;
                }
                this.blnum += 4;
                input.DropBits(4);
                this.blLens = new byte[0x13];
                this.ptr = 0;
                this.mode = 3;
            Label_013B:
                while (this.ptr < this.blnum)
                {
                    int num = input.PeekBits(3);
                    if (num < 0)
                    {
                        return false;
                    }
                    input.DropBits(3);
                    this.blLens[BL_ORDER[this.ptr]] = (byte) num;
                    this.ptr++;
                }
                this.blTree = new SimpleZip.InflaterHuffmanTree(this.blLens);
                this.blLens = null;
                this.ptr = 0;
                this.mode = 4;
            Label_01A8:
                while (((num2 = this.blTree.GetSymbol(input)) & -16) == 0)
                {
                    this.litdistLens[this.ptr++] = this.lastLen = (byte) num2;
                    if (this.ptr == this.num)
                    {
                        return true;
                    }
                }
                if (num2 < 0)
                {
                    return false;
                }
                if (num2 >= 0x11)
                {
                    this.lastLen = 0;
                }
                this.repSymbol = num2 - 0x10;
                this.mode = 5;
            Label_01DE:
                num3 = repBits[this.repSymbol];
                int num4 = input.PeekBits(num3);
                if (num4 < 0)
                {
                    return false;
                }
                input.DropBits(num3);
                num4 += repMin[this.repSymbol];
                while (num4-- > 0)
                {
                    this.litdistLens[this.ptr++] = this.lastLen;
                }
                if (this.ptr == this.num)
                {
                    return true;
                }
                this.mode = 4;
                goto Label_0000;
            }