internal int End()
{
if (this.blocks != null)
{
this.blocks.Free();
}
this.blocks = null;
return(0);
}
internal int Initialize(ZlibCodec codec, int w)
{
this._codec = codec;
this._codec.Message = null;
this.blocks = null;
if (w < 8 || w > 15)
{
this.End();
throw new ZlibException("Bad window size.");
}
this.wbits = w;
this.blocks = new InflateBlocks(codec, (!this.HandleRfc1950HeaderBytes) ? null : this, 1 << w);
this.Reset();
return(0);
}
internal int Process(InflateBlocks blocks, int r)
{
ZlibCodec codec = blocks._codec;
int num = codec.NextIn;
int num2 = codec.AvailableBytesIn;
int num3 = blocks.bitb;
int i = blocks.bitk;
int num4 = blocks.writeAt;
int num5 = (num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1);
while (true)
{
int num6;
switch (this.mode)
{
case 0:
if (num5 >= 258 && num2 >= 10)
{
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
r = this.InflateFast((int)this.lbits, (int)this.dbits, this.ltree, this.ltree_index, this.dtree, this.dtree_index, blocks, codec);
num = codec.NextIn;
num2 = codec.AvailableBytesIn;
num3 = blocks.bitb;
i = blocks.bitk;
num4 = blocks.writeAt;
num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1));
if (r != 0)
{
this.mode = ((r != 1) ? 9 : 7);
continue;
}
}
this.need = (int)this.lbits;
this.tree = this.ltree;
this.tree_index = this.ltree_index;
this.mode = 1;
goto IL_1C4;
case 1:
goto IL_1C4;
case 2:
num6 = this.bitsToGet;
while (i < num6)
{
if (num2 == 0)
{
goto IL_3A2;
}
r = 0;
num2--;
num3 |= (int)(codec.InputBuffer[num++] & 255) << i;
i += 8;
}
this.len += (num3 & InternalInflateConstants.InflateMask[num6]);
num3 >>= num6;
i -= num6;
this.need = (int)this.dbits;
this.tree = this.dtree;
this.tree_index = this.dtree_index;
this.mode = 3;
goto IL_471;
case 3:
goto IL_471;
case 4:
num6 = this.bitsToGet;
while (i < num6)
{
if (num2 == 0)
{
goto IL_618;
}
r = 0;
num2--;
num3 |= (int)(codec.InputBuffer[num++] & 255) << i;
i += 8;
}
this.dist += (num3 & InternalInflateConstants.InflateMask[num6]);
num3 >>= num6;
i -= num6;
this.mode = 5;
goto IL_6C3;
case 5:
goto IL_6C3;
case 6:
if (num5 == 0)
{
if (num4 == blocks.end && blocks.readAt != 0)
{
num4 = 0;
num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1));
}
if (num5 == 0)
{
blocks.writeAt = num4;
r = blocks.Flush(r);
num4 = blocks.writeAt;
num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1));
if (num4 == blocks.end && blocks.readAt != 0)
{
num4 = 0;
num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1));
}
if (num5 == 0)
{
goto Block_44;
}
}
}
r = 0;
blocks.window[num4++] = (byte)this.lit;
num5--;
this.mode = 0;
continue;
case 7:
goto IL_9B8;
case 8:
goto IL_A7A;
case 9:
goto IL_AC7;
}
break;
continue;
IL_1C4:
num6 = this.need;
while (i < num6)
{
if (num2 == 0)
{
goto IL_1DF;
}
r = 0;
num2--;
num3 |= (int)(codec.InputBuffer[num++] & 255) << i;
i += 8;
}
int num7 = (this.tree_index + (num3 & InternalInflateConstants.InflateMask[num6])) * 3;
num3 >>= this.tree[num7 + 1];
i -= this.tree[num7 + 1];
int num8 = this.tree[num7];
if (num8 == 0)
{
this.lit = this.tree[num7 + 2];
this.mode = 6;
continue;
}
if ((num8 & 16) != 0)
{
this.bitsToGet = (num8 & 15);
this.len = this.tree[num7 + 2];
this.mode = 2;
continue;
}
if ((num8 & 64) == 0)
{
this.need = num8;
this.tree_index = num7 / 3 + this.tree[num7 + 2];
continue;
}
if ((num8 & 32) != 0)
{
this.mode = 7;
continue;
}
goto IL_325;
IL_471:
num6 = this.need;
while (i < num6)
{
if (num2 == 0)
{
goto IL_48C;
}
r = 0;
num2--;
num3 |= (int)(codec.InputBuffer[num++] & 255) << i;
i += 8;
}
num7 = (this.tree_index + (num3 & InternalInflateConstants.InflateMask[num6])) * 3;
num3 >>= this.tree[num7 + 1];
i -= this.tree[num7 + 1];
num8 = this.tree[num7];
if ((num8 & 16) != 0)
{
this.bitsToGet = (num8 & 15);
this.dist = this.tree[num7 + 2];
this.mode = 4;
continue;
}
if ((num8 & 64) == 0)
{
this.need = num8;
this.tree_index = num7 / 3 + this.tree[num7 + 2];
continue;
}
goto IL_59B;
IL_6C3:
int j;
for (j = num4 - this.dist; j < 0; j += blocks.end)
{
}
while (this.len != 0)
{
if (num5 == 0)
{
if (num4 == blocks.end && blocks.readAt != 0)
{
num4 = 0;
num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1));
}
if (num5 == 0)
{
blocks.writeAt = num4;
r = blocks.Flush(r);
num4 = blocks.writeAt;
num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1));
if (num4 == blocks.end && blocks.readAt != 0)
{
num4 = 0;
num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1));
}
if (num5 == 0)
{
goto Block_32;
}
}
}
blocks.window[num4++] = blocks.window[j++];
num5--;
if (j == blocks.end)
{
j = 0;
}
this.len--;
}
this.mode = 0;
}
r = -2;
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
IL_1DF:
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
IL_325:
this.mode = 9;
codec.Message = "invalid literal/length code";
r = -3;
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
IL_3A2:
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
IL_48C:
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
IL_59B:
this.mode = 9;
codec.Message = "invalid distance code";
r = -3;
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
IL_618:
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
Block_32:
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
Block_44:
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
IL_9B8:
if (i > 7)
{
i -= 8;
num2++;
num--;
}
blocks.writeAt = num4;
r = blocks.Flush(r);
num4 = blocks.writeAt;
int arg_A11_0 = (num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1);
if (blocks.readAt != blocks.writeAt)
{
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
}
this.mode = 8;
IL_A7A:
r = 1;
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
IL_AC7:
r = -3;
blocks.bitb = num3;
blocks.bitk = i;
codec.AvailableBytesIn = num2;
codec.TotalBytesIn += (long)(num - codec.NextIn);
codec.NextIn = num;
blocks.writeAt = num4;
return(blocks.Flush(r));
}
internal int InflateFast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InflateBlocks s, ZlibCodec z)
{
int num = z.NextIn;
int num2 = z.AvailableBytesIn;
int num3 = s.bitb;
int i = s.bitk;
int num4 = s.writeAt;
int num5 = (num4 >= s.readAt) ? (s.end - num4) : (s.readAt - num4 - 1);
int num6 = InternalInflateConstants.InflateMask[bl];
int num7 = InternalInflateConstants.InflateMask[bd];
int num10;
int num11;
while (true)
{
while (i < 20)
{
num2--;
num3 |= (int)(z.InputBuffer[num++] & 255) << i;
i += 8;
}
int num8 = num3 & num6;
int num9 = (tl_index + num8) * 3;
if ((num10 = tl[num9]) == 0)
{
num3 >>= tl[num9 + 1];
i -= tl[num9 + 1];
s.window[num4++] = (byte)tl[num9 + 2];
num5--;
}
else
{
while (true)
{
num3 >>= tl[num9 + 1];
i -= tl[num9 + 1];
if ((num10 & 16) != 0)
{
break;
}
if ((num10 & 64) != 0)
{
goto IL_50A;
}
num8 += tl[num9 + 2];
num8 += (num3 & InternalInflateConstants.InflateMask[num10]);
num9 = (tl_index + num8) * 3;
if ((num10 = tl[num9]) == 0)
{
goto Block_20;
}
}
num10 &= 15;
num11 = tl[num9 + 2] + (num3 & InternalInflateConstants.InflateMask[num10]);
num3 >>= num10;
for (i -= num10; i < 15; i += 8)
{
num2--;
num3 |= (int)(z.InputBuffer[num++] & 255) << i;
}
num8 = (num3 & num7);
num9 = (td_index + num8) * 3;
num10 = td[num9];
while (true)
{
num3 >>= td[num9 + 1];
i -= td[num9 + 1];
if ((num10 & 16) != 0)
{
break;
}
if ((num10 & 64) != 0)
{
goto IL_400;
}
num8 += td[num9 + 2];
num8 += (num3 & InternalInflateConstants.InflateMask[num10]);
num9 = (td_index + num8) * 3;
num10 = td[num9];
}
num10 &= 15;
while (i < num10)
{
num2--;
num3 |= (int)(z.InputBuffer[num++] & 255) << i;
i += 8;
}
int num12 = td[num9 + 2] + (num3 & InternalInflateConstants.InflateMask[num10]);
num3 >>= num10;
i -= num10;
num5 -= num11;
int num13;
if (num4 >= num12)
{
num13 = num4 - num12;
if (num4 - num13 > 0 && 2 > num4 - num13)
{
s.window[num4++] = s.window[num13++];
s.window[num4++] = s.window[num13++];
num11 -= 2;
}
else
{
Array.Copy(s.window, num13, s.window, num4, 2);
num4 += 2;
num13 += 2;
num11 -= 2;
}
}
else
{
num13 = num4 - num12;
do
{
num13 += s.end;
}while (num13 < 0);
num10 = s.end - num13;
if (num11 > num10)
{
num11 -= num10;
if (num4 - num13 > 0 && num10 > num4 - num13)
{
do
{
s.window[num4++] = s.window[num13++];
}while (--num10 != 0);
}
else
{
Array.Copy(s.window, num13, s.window, num4, num10);
num4 += num10;
num13 += num10;
}
num13 = 0;
}
}
if (num4 - num13 > 0 && num11 > num4 - num13)
{
do
{
s.window[num4++] = s.window[num13++];
}while (--num11 != 0);
}
else
{
Array.Copy(s.window, num13, s.window, num4, num11);
num4 += num11;
num13 += num11;
}
goto IL_62B;
Block_20:
num3 >>= tl[num9 + 1];
i -= tl[num9 + 1];
s.window[num4++] = (byte)tl[num9 + 2];
num5--;
}
IL_62B:
if (num5 < 258 || num2 < 10)
{
goto IL_640;
}
}
IL_400:
z.Message = "invalid distance code";
num11 = z.AvailableBytesIn - num2;
num11 = ((i >> 3 >= num11) ? num11 : (i >> 3));
num2 += num11;
num -= num11;
i -= num11 << 3;
s.bitb = num3;
s.bitk = i;
z.AvailableBytesIn = num2;
z.TotalBytesIn += (long)(num - z.NextIn);
z.NextIn = num;
s.writeAt = num4;
return(-3);
IL_50A:
if ((num10 & 32) != 0)
{
num11 = z.AvailableBytesIn - num2;
num11 = ((i >> 3 >= num11) ? num11 : (i >> 3));
num2 += num11;
num -= num11;
i -= num11 << 3;
s.bitb = num3;
s.bitk = i;
z.AvailableBytesIn = num2;
z.TotalBytesIn += (long)(num - z.NextIn);
z.NextIn = num;
s.writeAt = num4;
return(1);
}
z.Message = "invalid literal/length code";
num11 = z.AvailableBytesIn - num2;
num11 = ((i >> 3 >= num11) ? num11 : (i >> 3));
num2 += num11;
num -= num11;
i -= num11 << 3;
s.bitb = num3;
s.bitk = i;
z.AvailableBytesIn = num2;
z.TotalBytesIn += (long)(num - z.NextIn);
z.NextIn = num;
s.writeAt = num4;
return(-3);
IL_640:
num11 = z.AvailableBytesIn - num2;
num11 = ((i >> 3 >= num11) ? num11 : (i >> 3));
num2 += num11;
num -= num11;
i -= num11 << 3;
s.bitb = num3;
s.bitk = i;
z.AvailableBytesIn = num2;
z.TotalBytesIn += (long)(num - z.NextIn);
z.NextIn = num;
s.writeAt = num4;
return(0);
}
