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 InflateFast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InflateBlocks s, ZlibCodec z)
{
int num12;
int nextIn = z.NextIn;
int availableBytesIn = z.AvailableBytesIn;
int bitb = s.bitb;
int bitk = s.bitk;
int writeAt = s.writeAt;
int num9 = (writeAt >= s.readAt) ? (s.end - writeAt) : ((s.readAt - writeAt) - 1);
int num10 = InternalInflateConstants.InflateMask[bl];
int num11 = InternalInflateConstants.InflateMask[bd];
Label_009B:
while (bitk < 20)
{
availableBytesIn--;
bitb |= (z.InputBuffer[nextIn++] & 0xff) << bitk;
bitk += 8;
}
int num = bitb & num10;
int[] numArray = tl;
int num2 = tl_index;
int index = (num2 + num) * 3;
int num3 = numArray[index];
if (num3 == 0)
{
bitb = bitb >> numArray[index + 1];
bitk -= numArray[index + 1];
s.window[writeAt++] = (byte)numArray[index + 2];
num9--;
goto Label_062B;
}
Label_00FB:
bitb = bitb >> numArray[index + 1];
bitk -= numArray[index + 1];
if ((num3 & 0x10) == 0)
{
if ((num3 & 0x40) == 0)
{
num += numArray[index + 2];
num += bitb & InternalInflateConstants.InflateMask[num3];
index = (num2 + num) * 3;
num3 = numArray[index];
if (num3 != 0)
{
goto Label_00FB;
}
bitb = bitb >> numArray[index + 1];
bitk -= numArray[index + 1];
s.window[writeAt++] = (byte)numArray[index + 2];
num9--;
}
else
{
if ((num3 & 0x20) != 0)
{
num12 = z.AvailableBytesIn - availableBytesIn;
num12 = ((bitk >> 3) >= num12) ? num12 : (bitk >> 3);
availableBytesIn += num12;
nextIn -= num12;
bitk -= num12 << 3;
s.bitb = bitb;
s.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
s.writeAt = writeAt;
return(1);
}
z.Message = "invalid literal/length code";
num12 = z.AvailableBytesIn - availableBytesIn;
num12 = ((bitk >> 3) >= num12) ? num12 : (bitk >> 3);
availableBytesIn += num12;
nextIn -= num12;
bitk -= num12 << 3;
s.bitb = bitb;
s.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
s.writeAt = writeAt;
return(-3);
}
goto Label_062B;
}
num3 &= 15;
num12 = numArray[index + 2] + (bitb & InternalInflateConstants.InflateMask[num3]);
bitb = bitb >> num3;
bitk -= num3;
while (bitk < 15)
{
availableBytesIn--;
bitb |= (z.InputBuffer[nextIn++] & 0xff) << bitk;
bitk += 8;
}
num = bitb & num11;
numArray = td;
num2 = td_index;
index = (num2 + num) * 3;
num3 = numArray[index];
Label_0196:
bitb = bitb >> numArray[index + 1];
bitk -= numArray[index + 1];
if ((num3 & 0x10) != 0)
{
int num14;
num3 &= 15;
while (bitk < num3)
{
availableBytesIn--;
bitb |= (z.InputBuffer[nextIn++] & 0xff) << bitk;
bitk += 8;
}
int num13 = numArray[index + 2] + (bitb & InternalInflateConstants.InflateMask[num3]);
bitb = bitb >> num3;
bitk -= num3;
num9 -= num12;
if (writeAt >= num13)
{
num14 = writeAt - num13;
if (((writeAt - num14) > 0) && (2 > (writeAt - num14)))
{
s.window[writeAt++] = s.window[num14++];
s.window[writeAt++] = s.window[num14++];
num12 -= 2;
}
else
{
Array.Copy(s.window, num14, s.window, writeAt, 2);
writeAt += 2;
num14 += 2;
num12 -= 2;
}
}
else
{
num14 = writeAt - num13;
do
{
num14 += s.end;
}while (num14 < 0);
num3 = s.end - num14;
if (num12 > num3)
{
num12 -= num3;
if (((writeAt - num14) > 0) && (num3 > (writeAt - num14)))
{
do
{
s.window[writeAt++] = s.window[num14++];
}while (--num3 != 0);
}
else
{
Array.Copy(s.window, num14, s.window, writeAt, num3);
writeAt += num3;
num14 += num3;
num3 = 0;
}
num14 = 0;
}
}
if (((writeAt - num14) > 0) && (num12 > (writeAt - num14)))
{
do
{
s.window[writeAt++] = s.window[num14++];
}while (--num12 != 0);
}
else
{
Array.Copy(s.window, num14, s.window, writeAt, num12);
writeAt += num12;
num14 += num12;
num12 = 0;
}
}
else
{
if ((num3 & 0x40) == 0)
{
num += numArray[index + 2];
num += bitb & InternalInflateConstants.InflateMask[num3];
index = (num2 + num) * 3;
num3 = numArray[index];
goto Label_0196;
}
z.Message = "invalid distance code";
num12 = z.AvailableBytesIn - availableBytesIn;
num12 = ((bitk >> 3) >= num12) ? num12 : (bitk >> 3);
availableBytesIn += num12;
nextIn -= num12;
bitk -= num12 << 3;
s.bitb = bitb;
s.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
s.writeAt = writeAt;
return(-3);
}
Label_062B:
if ((num9 >= 0x102) && (availableBytesIn >= 10))
{
goto Label_009B;
}
num12 = z.AvailableBytesIn - availableBytesIn;
num12 = ((bitk >> 3) >= num12) ? num12 : (bitk >> 3);
availableBytesIn += num12;
nextIn -= num12;
bitk -= num12 << 3;
s.bitb = bitb;
s.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
s.writeAt = writeAt;
return(0);
}
internal int Process(InflateBlocks blocks, int r)
{
int bitsToGet;
int num10;
int bitb = 0;
int bitk = 0;
int nextIn = 0;
ZlibCodec z = blocks._codec;
nextIn = z.NextIn;
int availableBytesIn = z.AvailableBytesIn;
bitb = blocks.bitb;
bitk = blocks.bitk;
int writeAt = blocks.writeAt;
int num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
Label_0061:
switch (this.mode)
{
case 0:
if ((num9 < 0x102) || (availableBytesIn < 10))
{
break;
}
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
r = this.InflateFast(this.lbits, this.dbits, this.ltree, this.ltree_index, this.dtree, this.dtree_index, blocks, z);
nextIn = z.NextIn;
availableBytesIn = z.AvailableBytesIn;
bitb = blocks.bitb;
bitk = blocks.bitk;
writeAt = blocks.writeAt;
num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
if (r == 0)
{
break;
}
this.mode = (r != 1) ? 9 : 7;
goto Label_0061;
case 1:
goto Label_01C4;
case 2:
bitsToGet = this.bitsToGet;
while (bitk < bitsToGet)
{
if (availableBytesIn != 0)
{
r = 0;
}
else
{
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
availableBytesIn--;
bitb |= (z.InputBuffer[nextIn++] & 0xff) << bitk;
bitk += 8;
}
this.len += bitb & InternalInflateConstants.InflateMask[bitsToGet];
bitb = bitb >> bitsToGet;
bitk -= bitsToGet;
this.need = this.dbits;
this.tree = this.dtree;
this.tree_index = this.dtree_index;
this.mode = 3;
goto Label_0471;
case 3:
goto Label_0471;
case 4:
bitsToGet = this.bitsToGet;
while (bitk < bitsToGet)
{
if (availableBytesIn != 0)
{
r = 0;
}
else
{
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
availableBytesIn--;
bitb |= (z.InputBuffer[nextIn++] & 0xff) << bitk;
bitk += 8;
}
this.dist += bitb & InternalInflateConstants.InflateMask[bitsToGet];
bitb = bitb >> bitsToGet;
bitk -= bitsToGet;
this.mode = 5;
goto Label_06C3;
case 5:
goto Label_06C3;
case 6:
if (num9 == 0)
{
if ((writeAt == blocks.end) && (blocks.readAt != 0))
{
writeAt = 0;
num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
}
if (num9 == 0)
{
blocks.writeAt = writeAt;
r = blocks.Flush(r);
writeAt = blocks.writeAt;
num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
if ((writeAt == blocks.end) && (blocks.readAt != 0))
{
writeAt = 0;
num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
}
if (num9 == 0)
{
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
}
}
r = 0;
blocks.window[writeAt++] = (byte)this.lit;
num9--;
this.mode = 0;
goto Label_0061;
case 7:
if (bitk > 7)
{
bitk -= 8;
availableBytesIn++;
nextIn--;
}
blocks.writeAt = writeAt;
r = blocks.Flush(r);
writeAt = blocks.writeAt;
num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
if (blocks.readAt != blocks.writeAt)
{
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
this.mode = 8;
goto Label_0A7A;
case 8:
goto Label_0A7A;
case 9:
r = -3;
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
default:
r = -2;
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
this.need = this.lbits;
this.tree = this.ltree;
this.tree_index = this.ltree_index;
this.mode = 1;
Label_01C4:
bitsToGet = this.need;
while (bitk < bitsToGet)
{
if (availableBytesIn != 0)
{
r = 0;
}
else
{
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
availableBytesIn--;
bitb |= (z.InputBuffer[nextIn++] & 0xff) << bitk;
bitk += 8;
}
int index = (this.tree_index + (bitb & InternalInflateConstants.InflateMask[bitsToGet])) * 3;
bitb = bitb >> this.tree[index + 1];
bitk -= this.tree[index + 1];
int num3 = this.tree[index];
if (num3 == 0)
{
this.lit = this.tree[index + 2];
this.mode = 6;
goto Label_0061;
}
if ((num3 & 0x10) != 0)
{
this.bitsToGet = num3 & 15;
this.len = this.tree[index + 2];
this.mode = 2;
goto Label_0061;
}
if ((num3 & 0x40) == 0)
{
this.need = num3;
this.tree_index = (index / 3) + this.tree[index + 2];
goto Label_0061;
}
if ((num3 & 0x20) != 0)
{
this.mode = 7;
goto Label_0061;
}
this.mode = 9;
z.Message = "invalid literal/length code";
r = -3;
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
Label_0471:
bitsToGet = this.need;
while (bitk < bitsToGet)
{
if (availableBytesIn != 0)
{
r = 0;
}
else
{
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
availableBytesIn--;
bitb |= (z.InputBuffer[nextIn++] & 0xff) << bitk;
bitk += 8;
}
index = (this.tree_index + (bitb & InternalInflateConstants.InflateMask[bitsToGet])) * 3;
bitb = bitb >> this.tree[index + 1];
bitk -= this.tree[index + 1];
num3 = this.tree[index];
if ((num3 & 0x10) != 0)
{
this.bitsToGet = num3 & 15;
this.dist = this.tree[index + 2];
this.mode = 4;
goto Label_0061;
}
if ((num3 & 0x40) == 0)
{
this.need = num3;
this.tree_index = (index / 3) + this.tree[index + 2];
goto Label_0061;
}
this.mode = 9;
z.Message = "invalid distance code";
r = -3;
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
Label_06C3:
num10 = writeAt - this.dist;
while (num10 < 0)
{
num10 += blocks.end;
}
while (this.len != 0)
{
if (num9 == 0)
{
if ((writeAt == blocks.end) && (blocks.readAt != 0))
{
writeAt = 0;
num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
}
if (num9 == 0)
{
blocks.writeAt = writeAt;
r = blocks.Flush(r);
writeAt = blocks.writeAt;
num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
if ((writeAt == blocks.end) && (blocks.readAt != 0))
{
writeAt = 0;
num9 = (writeAt >= blocks.readAt) ? (blocks.end - writeAt) : ((blocks.readAt - writeAt) - 1);
}
if (num9 == 0)
{
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
}
}
blocks.window[writeAt++] = blocks.window[num10++];
num9--;
if (num10 == blocks.end)
{
num10 = 0;
}
this.len--;
}
this.mode = 0;
goto Label_0061;
Label_0A7A:
r = 1;
blocks.bitb = bitb;
blocks.bitk = bitk;
z.AvailableBytesIn = availableBytesIn;
z.TotalBytesIn += nextIn - z.NextIn;
z.NextIn = nextIn;
blocks.writeAt = writeAt;
return(blocks.Flush(r));
}
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_3A5;
}
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_477;
case 3:
goto IL_477;
case 4:
num6 = this.bitsToGet;
while (i < num6)
{
if (num2 == 0)
{
goto IL_621;
}
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_6CF;
case 5:
goto IL_6CF;
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_9C4;
case 8:
goto IL_A86;
case 9:
goto IL_AD3;
}
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_328;
IL_477:
num6 = this.need;
while (i < num6)
{
if (num2 == 0)
{
goto IL_492;
}
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_5A4;
IL_6CF:
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_328:
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_3A5:
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_492:
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_5A4:
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_621:
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_9C4:
if (i > 7)
{
i -= 8;
num2++;
num--;
}
blocks.writeAt = num4;
r = blocks.Flush(r);
num4 = blocks.writeAt;
int arg_A1D_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_A86:
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_AD3:
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 Process(InflateBlocks blocks, int r)
{
int j; // temporary storage
int tindex; // temporary pointer
int e; // extra bits or operation
int b = 0; // bit buffer
int k = 0; // bits in bit buffer
int p = 0; // input data pointer
int n; // bytes available there
int q; // output window write pointer
int m; // bytes to end of window or read pointer
int f; // pointer to copy strings from
ZlibCodec z = blocks._codec;
// copy input/output information to locals (UPDATE macro restores)
p = z.NextIn;
n = z.AvailableBytesIn;
b = blocks.bitb;
k = blocks.bitk;
q = blocks.writeAt; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
// process input and output based on current state
while (true)
{
switch (mode)
{
// waiting for "i:"=input, "o:"=output, "x:"=nothing
case START: // x: set up for LEN
if (m >= 258 && n >= 10)
{
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.writeAt = q;
r = InflateFast(lbits, dbits, ltree, ltree_index, dtree, dtree_index, blocks, z);
p = z.NextIn;
n = z.AvailableBytesIn;
b = blocks.bitb;
k = blocks.bitk;
q = blocks.writeAt; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
if (r != ZlibConstants.Z_OK)
{
mode = (r == ZlibConstants.Z_STREAM_END) ? WASH : BADCODE;
break;
}
}
need = lbits;
tree = ltree;
tree_index = ltree_index;
mode = LEN;
goto case LEN;
case LEN: // i: get length/literal/eob next
j = need;
while (k < j)
{
if (n != 0)
r = ZlibConstants.Z_OK;
else
{
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
}
n--;
b |= (z.InputBuffer[p++] & 0xff) << k;
k += 8;
}
tindex = (tree_index + (b & InternalInflateConstants.InflateMask[j])) * 3;
b >>= (tree[tindex + 1]);
k -= (tree[tindex + 1]);
e = tree[tindex];
if (e == 0)
{
// literal
lit = tree[tindex + 2];
mode = LIT;
break;
}
if ((e & 16) != 0)
{
// length
bitsToGet = e & 15;
len = tree[tindex + 2];
mode = LENEXT;
break;
}
if ((e & 64) == 0)
{
// next table
need = e;
tree_index = tindex / 3 + tree[tindex + 2];
break;
}
if ((e & 32) != 0)
{
// end of block
mode = WASH;
break;
}
mode = BADCODE; // invalid code
z.Message = "invalid literal/length code";
r = ZlibConstants.Z_DATA_ERROR;
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
case LENEXT: // i: getting length extra (have base)
j = bitsToGet;
while (k < j)
{
if (n != 0)
r = ZlibConstants.Z_OK;
else
{
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
}
n--; b |= (z.InputBuffer[p++] & 0xff) << k;
k += 8;
}
len += (b & InternalInflateConstants.InflateMask[j]);
b >>= j;
k -= j;
need = dbits;
tree = dtree;
tree_index = dtree_index;
mode = DIST;
goto case DIST;
case DIST: // i: get distance next
j = need;
while (k < j)
{
if (n != 0)
r = ZlibConstants.Z_OK;
else
{
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
}
n--; b |= (z.InputBuffer[p++] & 0xff) << k;
k += 8;
}
tindex = (tree_index + (b & InternalInflateConstants.InflateMask[j])) * 3;
b >>= tree[tindex + 1];
k -= tree[tindex + 1];
e = (tree[tindex]);
if ((e & 0x10) != 0)
{
// distance
bitsToGet = e & 15;
dist = tree[tindex + 2];
mode = DISTEXT;
break;
}
if ((e & 64) == 0)
{
// next table
need = e;
tree_index = tindex / 3 + tree[tindex + 2];
break;
}
mode = BADCODE; // invalid code
z.Message = "invalid distance code";
r = ZlibConstants.Z_DATA_ERROR;
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
case DISTEXT: // i: getting distance extra
j = bitsToGet;
while (k < j)
{
if (n != 0)
r = ZlibConstants.Z_OK;
else
{
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
}
n--; b |= (z.InputBuffer[p++] & 0xff) << k;
k += 8;
}
dist += (b & InternalInflateConstants.InflateMask[j]);
b >>= j;
k -= j;
mode = COPY;
goto case COPY;
case COPY: // o: copying bytes in window, waiting for space
f = q - dist;
while (f < 0)
{
// modulo window size-"while" instead
f += blocks.end; // of "if" handles invalid distances
}
while (len != 0)
{
if (m == 0)
{
if (q == blocks.end && blocks.readAt != 0)
{
q = 0; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
}
if (m == 0)
{
blocks.writeAt = q; r = blocks.Flush(r);
q = blocks.writeAt; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
if (q == blocks.end && blocks.readAt != 0)
{
q = 0; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
}
if (m == 0)
{
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
}
}
}
blocks.window[q++] = blocks.window[f++]; m--;
if (f == blocks.end)
f = 0;
len--;
}
mode = START;
break;
case LIT: // o: got literal, waiting for output space
if (m == 0)
{
if (q == blocks.end && blocks.readAt != 0)
{
q = 0; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
}
if (m == 0)
{
blocks.writeAt = q; r = blocks.Flush(r);
q = blocks.writeAt; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
if (q == blocks.end && blocks.readAt != 0)
{
q = 0; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
}
if (m == 0)
{
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
}
}
}
r = ZlibConstants.Z_OK;
blocks.window[q++] = (byte)lit; m--;
mode = START;
break;
case WASH: // o: got eob, possibly more output
if (k > 7)
{
// return unused byte, if any
k -= 8;
n++;
p--; // can always return one
}
blocks.writeAt = q; r = blocks.Flush(r);
q = blocks.writeAt; m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
if (blocks.readAt != blocks.writeAt)
{
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
}
mode = END;
goto case END;
case END:
r = ZlibConstants.Z_STREAM_END;
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
case BADCODE: // x: got error
r = ZlibConstants.Z_DATA_ERROR;
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
return blocks.Flush(r);
default:
r = ZlibConstants.Z_STREAM_ERROR;
blocks.bitb = b; blocks.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
blocks.writeAt = q;
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_513;
}
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_409;
}
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_634;
Block_20:
num3 >>= tl[num9 + 1];
i -= tl[num9 + 1];
s.window[num4++] = (byte)tl[num9 + 2];
num5--;
}
IL_634:
if (num5 < 258 || num2 < 10)
{
goto IL_649;
}
}
IL_409:
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_513:
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_649:
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);
}
internal int Initialize(ZlibCodec codec, int w)
{
_codec = codec;
_codec.Message = null;
blocks = null;
// handle undocumented nowrap option (no zlib header or check)
//nowrap = 0;
//if (w < 0)
//{
// w = - w;
// nowrap = 1;
//}
// set window size
if (w < 8 || w > 15)
{
End();
throw new ZlibException("Bad window size.");
//return ZlibConstants.Z_STREAM_ERROR;
}
wbits = w;
blocks = new InflateBlocks(codec,
HandleRfc1950HeaderBytes ? this : null,
1 << w);
// reset state
Reset();
return ZlibConstants.Z_OK;
}
internal int End()
{
if (blocks != null)
blocks.Free();
blocks = null;
return ZlibConstants.Z_OK;
}
// Called with number of bytes left to write in window at least 258
// (the maximum string length) and number of input bytes available
// at least ten. The ten bytes are six bytes for the longest length/
// distance pair plus four bytes for overloading the bit buffer.
internal int InflateFast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InflateBlocks s, ZlibCodec z)
{
int t; // temporary pointer
int[] tp; // temporary pointer
int tp_index; // temporary pointer
int e; // extra bits or operation
int b; // bit buffer
int k; // bits in bit buffer
int p; // input data pointer
int n; // bytes available there
int q; // output window write pointer
int m; // bytes to end of window or read pointer
int ml; // mask for literal/length tree
int md; // mask for distance tree
int c; // bytes to copy
int d; // distance back to copy from
int r; // copy source pointer
int tp_index_t_3; // (tp_index+t)*3
// load input, output, bit values
p = z.NextIn; n = z.AvailableBytesIn; b = s.bitb; k = s.bitk;
q = s.writeAt; m = q < s.readAt ? s.readAt - q - 1 : s.end - q;
// initialize masks
ml = InternalInflateConstants.InflateMask[bl];
md = InternalInflateConstants.InflateMask[bd];
// do until not enough input or output space for fast loop
do
{
// assume called with m >= 258 && n >= 10
// get literal/length code
while (k < (20))
{
// max bits for literal/length code
n--;
b |= (z.InputBuffer[p++] & 0xff) << k; k += 8;
}
t = b & ml;
tp = tl;
tp_index = tl_index;
tp_index_t_3 = (tp_index + t) * 3;
if ((e = tp[tp_index_t_3]) == 0)
{
b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]);
s.window[q++] = (byte)tp[tp_index_t_3 + 2];
m--;
continue;
}
do
{
b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]);
if ((e & 16) != 0)
{
e &= 15;
c = tp[tp_index_t_3 + 2] + ((int)b & InternalInflateConstants.InflateMask[e]);
b >>= e; k -= e;
// decode distance base of block to copy
while (k < 15)
{
// max bits for distance code
n--;
b |= (z.InputBuffer[p++] & 0xff) << k; k += 8;
}
t = b & md;
tp = td;
tp_index = td_index;
tp_index_t_3 = (tp_index + t) * 3;
e = tp[tp_index_t_3];
do
{
b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]);
if ((e & 16) != 0)
{
// get extra bits to add to distance base
e &= 15;
while (k < e)
{
// get extra bits (up to 13)
n--;
b |= (z.InputBuffer[p++] & 0xff) << k; k += 8;
}
d = tp[tp_index_t_3 + 2] + (b & InternalInflateConstants.InflateMask[e]);
b >>= e; k -= e;
// do the copy
m -= c;
if (q >= d)
{
// offset before dest
// just copy
r = q - d;
if (q - r > 0 && 2 > (q - r))
{
s.window[q++] = s.window[r++]; // minimum count is three,
s.window[q++] = s.window[r++]; // so unroll loop a little
c -= 2;
}
else
{
Array.Copy(s.window, r, s.window, q, 2);
q += 2; r += 2; c -= 2;
}
}
else
{
// else offset after destination
r = q - d;
do
{
r += s.end; // force pointer in window
}
while (r < 0); // covers invalid distances
e = s.end - r;
if (c > e)
{
// if source crosses,
c -= e; // wrapped copy
if (q - r > 0 && e > (q - r))
{
do
{
s.window[q++] = s.window[r++];
}
while (--e != 0);
}
else
{
Array.Copy(s.window, r, s.window, q, e);
q += e; r += e; e = 0;
}
r = 0; // copy rest from start of window
}
}
// copy all or what's left
if (q - r > 0 && c > (q - r))
{
do
{
s.window[q++] = s.window[r++];
}
while (--c != 0);
}
else
{
Array.Copy(s.window, r, s.window, q, c);
q += c; r += c; c = 0;
}
break;
}
else if ((e & 64) == 0)
{
t += tp[tp_index_t_3 + 2];
t += (b & InternalInflateConstants.InflateMask[e]);
tp_index_t_3 = (tp_index + t) * 3;
e = tp[tp_index_t_3];
}
else
{
z.Message = "invalid distance code";
c = z.AvailableBytesIn - n; c = (k >> 3) < c ? k >> 3 : c; n += c; p -= c; k -= (c << 3);
s.bitb = b; s.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
s.writeAt = q;
return ZlibConstants.Z_DATA_ERROR;
}
}
while (true);
break;
}
if ((e & 64) == 0)
{
t += tp[tp_index_t_3 + 2];
t += (b & InternalInflateConstants.InflateMask[e]);
tp_index_t_3 = (tp_index + t) * 3;
if ((e = tp[tp_index_t_3]) == 0)
{
b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]);
s.window[q++] = (byte)tp[tp_index_t_3 + 2];
m--;
break;
}
}
else if ((e & 32) != 0)
{
c = z.AvailableBytesIn - n; c = (k >> 3) < c ? k >> 3 : c; n += c; p -= c; k -= (c << 3);
s.bitb = b; s.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
s.writeAt = q;
return ZlibConstants.Z_STREAM_END;
}
else
{
z.Message = "invalid literal/length code";
c = z.AvailableBytesIn - n; c = (k >> 3) < c ? k >> 3 : c; n += c; p -= c; k -= (c << 3);
s.bitb = b; s.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
s.writeAt = q;
return ZlibConstants.Z_DATA_ERROR;
}
}
while (true);
}
while (m >= 258 && n >= 10);
// not enough input or output--restore pointers and return
c = z.AvailableBytesIn - n; c = (k >> 3) < c ? k >> 3 : c; n += c; p -= c; k -= (c << 3);
s.bitb = b; s.bitk = k;
z.AvailableBytesIn = n; z.TotalBytesIn += p - z.NextIn; z.NextIn = p;
s.writeAt = q;
return ZlibConstants.Z_OK;
}
internal int Process(InflateBlocks blocks, int r)
{
int num = 0;
int num2 = 0;
int num3 = 0;
ZlibCodec codec = blocks._codec;
num3 = codec.NextIn;
int num4 = codec.AvailableBytesIn;
num = blocks.bitb;
num2 = blocks.bitk;
int num5 = blocks.writeAt;
int num6 = (num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1);
while (true)
{
switch (mode)
{
case 0:
if (num6 >= 258 && num4 >= 10)
{
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
r = InflateFast(lbits, dbits, ltree, ltree_index, dtree, dtree_index, blocks, codec);
num3 = codec.NextIn;
num4 = codec.AvailableBytesIn;
num = blocks.bitb;
num2 = blocks.bitk;
num5 = blocks.writeAt;
num6 = ((num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1));
if (r != 0)
{
mode = ((r != 1) ? 9 : 7);
break;
}
}
need = lbits;
tree = ltree;
tree_index = ltree_index;
mode = 1;
goto case 1;
case 1:
{
int num8;
for (num8 = need; num2 < num8; num2 += 8)
{
if (num4 == 0)
{
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
r = 0;
num4--;
num |= (codec.InputBuffer[num3++] & 0xFF) << num2;
}
int num11 = (tree_index + (num & InternalInflateConstants.InflateMask[num8])) * 3;
num >>= tree[num11 + 1];
num2 -= tree[num11 + 1];
int num12 = tree[num11];
if (num12 == 0)
{
lit = tree[num11 + 2];
mode = 6;
}
else if ((num12 & 0x10) != 0)
{
bitsToGet = (num12 & 0xF);
len = tree[num11 + 2];
mode = 2;
}
else if ((num12 & 0x40) == 0)
{
need = num12;
tree_index = num11 / 3 + tree[num11 + 2];
}
else
{
if ((num12 & 0x20) == 0)
{
mode = 9;
codec.Message = "invalid literal/length code";
r = -3;
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
mode = 7;
}
break;
}
case 2:
{
int num8;
for (num8 = bitsToGet; num2 < num8; num2 += 8)
{
if (num4 == 0)
{
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
r = 0;
num4--;
num |= (codec.InputBuffer[num3++] & 0xFF) << num2;
}
len += (num & InternalInflateConstants.InflateMask[num8]);
num >>= num8;
num2 -= num8;
need = dbits;
tree = dtree;
tree_index = dtree_index;
mode = 3;
goto case 3;
}
case 3:
{
int num8;
for (num8 = need; num2 < num8; num2 += 8)
{
if (num4 == 0)
{
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
r = 0;
num4--;
num |= (codec.InputBuffer[num3++] & 0xFF) << num2;
}
int num11 = (tree_index + (num & InternalInflateConstants.InflateMask[num8])) * 3;
num >>= tree[num11 + 1];
num2 -= tree[num11 + 1];
int num12 = tree[num11];
if ((num12 & 0x10) != 0)
{
bitsToGet = (num12 & 0xF);
dist = tree[num11 + 2];
mode = 4;
}
else
{
if ((num12 & 0x40) != 0)
{
mode = 9;
codec.Message = "invalid distance code";
r = -3;
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
need = num12;
tree_index = num11 / 3 + tree[num11 + 2];
}
break;
}
case 4:
{
int num8;
for (num8 = bitsToGet; num2 < num8; num2 += 8)
{
if (num4 == 0)
{
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
r = 0;
num4--;
num |= (codec.InputBuffer[num3++] & 0xFF) << num2;
}
dist += (num & InternalInflateConstants.InflateMask[num8]);
num >>= num8;
num2 -= num8;
mode = 5;
goto case 5;
}
case 5:
{
int i;
for (i = num5 - dist; i < 0; i += blocks.end)
{
}
while (len != 0)
{
if (num6 == 0)
{
if (num5 == blocks.end && blocks.readAt != 0)
{
num5 = 0;
num6 = ((num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1));
}
if (num6 == 0)
{
blocks.writeAt = num5;
r = blocks.Flush(r);
num5 = blocks.writeAt;
num6 = ((num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1));
if (num5 == blocks.end && blocks.readAt != 0)
{
num5 = 0;
num6 = ((num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1));
}
if (num6 == 0)
{
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
}
}
blocks.window[num5++] = blocks.window[i++];
num6--;
if (i == blocks.end)
{
i = 0;
}
len--;
}
mode = 0;
break;
}
case 6:
if (num6 == 0)
{
if (num5 == blocks.end && blocks.readAt != 0)
{
num5 = 0;
num6 = ((num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1));
}
if (num6 == 0)
{
blocks.writeAt = num5;
r = blocks.Flush(r);
num5 = blocks.writeAt;
num6 = ((num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1));
if (num5 == blocks.end && blocks.readAt != 0)
{
num5 = 0;
num6 = ((num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1));
}
if (num6 == 0)
{
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
}
}
r = 0;
blocks.window[num5++] = (byte)lit;
num6--;
mode = 0;
break;
case 7:
if (num2 > 7)
{
num2 -= 8;
num4++;
num3--;
}
blocks.writeAt = num5;
r = blocks.Flush(r);
num5 = blocks.writeAt;
num6 = ((num5 >= blocks.readAt) ? (blocks.end - num5) : (blocks.readAt - num5 - 1));
if (blocks.readAt != blocks.writeAt)
{
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
}
mode = 8;
goto case 8;
case 8:
r = 1;
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
case 9:
r = -3;
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
return(blocks.Flush(r));
default:
r = -2;
blocks.bitb = num;
blocks.bitk = num2;
codec.AvailableBytesIn = num4;
codec.TotalBytesIn += num3 - codec.NextIn;
codec.NextIn = num3;
blocks.writeAt = num5;
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 num4 = s.bitk;
int num5 = s.writeAt;
int num6 = (num5 >= s.readAt) ? (s.end - num5) : (s.readAt - num5 - 1);
int num7 = InternalInflateConstants.InflateMask[bl];
int num8 = InternalInflateConstants.InflateMask[bd];
int num13;
while (true)
{
if (num4 < 20)
{
num2--;
num3 |= (z.InputBuffer[num++] & 0xFF) << (num4 & 0x1F);
num4 += 8;
}
else
{
int num10 = num3 & num7;
int num11 = (tl_index + num10) * 3;
int num12;
if ((num12 = tl[num11]) != 0)
{
while (true)
{
num3 >>= tl[num11 + 1];
num4 -= tl[num11 + 1];
if ((num12 & 0x10) != 0)
{
num12 &= 0xF;
num13 = tl[num11 + 2] + (num3 & InternalInflateConstants.InflateMask[num12]);
num3 >>= num12;
for (num4 -= num12; num4 < 15; num4 += 8)
{
num2--;
num3 |= (z.InputBuffer[num++] & 0xFF) << num4;
}
num10 = (num3 & num8);
num11 = (td_index + num10) * 3;
num12 = td[num11];
while (true)
{
num3 >>= td[num11 + 1];
num4 -= td[num11 + 1];
if ((num12 & 0x10) != 0)
{
break;
}
if ((num12 & 0x40) != 0)
{
z.Message = "invalid distance code";
num13 = z.AvailableBytesIn - num2;
num13 = ((num4 >> 3 >= num13) ? num13 : (num4 >> 3));
num2 += num13;
num -= num13;
num4 -= num13 << 3;
s.bitb = num3;
s.bitk = num4;
z.AvailableBytesIn = num2;
z.TotalBytesIn += num - z.NextIn;
z.NextIn = num;
s.writeAt = num5;
return(-3);
}
num10 += td[num11 + 2];
num10 += (num3 & InternalInflateConstants.InflateMask[num12]);
num11 = (td_index + num10) * 3;
num12 = td[num11];
}
for (num12 &= 0xF; num4 < num12; num4 += 8)
{
num2--;
num3 |= (z.InputBuffer[num++] & 0xFF) << num4;
}
int num16 = td[num11 + 2] + (num3 & InternalInflateConstants.InflateMask[num12]);
num3 >>= num12;
num4 -= num12;
num6 -= num13;
int num17;
if (num5 >= num16)
{
num17 = num5 - num16;
if (num5 - num17 > 0 && 2 > num5 - num17)
{
s.window[num5++] = s.window[num17++];
s.window[num5++] = s.window[num17++];
num13 -= 2;
}
else
{
Array.Copy(s.window, num17, s.window, num5, 2);
num5 += 2;
num17 += 2;
num13 -= 2;
}
}
else
{
num17 = num5 - num16;
do
{
num17 += s.end;
}while (num17 < 0);
num12 = s.end - num17;
if (num13 > num12)
{
num13 -= num12;
if (num5 - num17 > 0 && num12 > num5 - num17)
{
do
{
s.window[num5++] = s.window[num17++];
}while (--num12 != 0);
}
else
{
Array.Copy(s.window, num17, s.window, num5, num12);
num5 += num12;
num17 += num12;
num12 = 0;
}
num17 = 0;
}
}
if (num5 - num17 > 0 && num13 > num5 - num17)
{
do
{
s.window[num5++] = s.window[num17++];
}while (--num13 != 0);
}
else
{
Array.Copy(s.window, num17, s.window, num5, num13);
num5 += num13;
num17 += num13;
num13 = 0;
}
break;
}
if ((num12 & 0x40) != 0)
{
if ((num12 & 0x20) != 0)
{
num13 = z.AvailableBytesIn - num2;
num13 = ((num4 >> 3 >= num13) ? num13 : (num4 >> 3));
num2 += num13;
num -= num13;
num4 -= num13 << 3;
s.bitb = num3;
s.bitk = num4;
z.AvailableBytesIn = num2;
z.TotalBytesIn += num - z.NextIn;
z.NextIn = num;
s.writeAt = num5;
return(1);
}
z.Message = "invalid literal/length code";
num13 = z.AvailableBytesIn - num2;
num13 = ((num4 >> 3 >= num13) ? num13 : (num4 >> 3));
num2 += num13;
num -= num13;
num4 -= num13 << 3;
s.bitb = num3;
s.bitk = num4;
z.AvailableBytesIn = num2;
z.TotalBytesIn += num - z.NextIn;
z.NextIn = num;
s.writeAt = num5;
return(-3);
}
num10 += tl[num11 + 2];
num10 += (num3 & InternalInflateConstants.InflateMask[num12]);
num11 = (tl_index + num10) * 3;
if ((num12 = tl[num11]) == 0)
{
num3 >>= tl[num11 + 1];
num4 -= tl[num11 + 1];
s.window[num5++] = (byte)tl[num11 + 2];
num6--;
break;
}
}
}
else
{
num3 >>= tl[num11 + 1];
num4 -= tl[num11 + 1];
s.window[num5++] = (byte)tl[num11 + 2];
num6--;
}
if (num6 < 258 || num2 < 10)
{
break;
}
}
}
num13 = z.AvailableBytesIn - num2;
num13 = ((num4 >> 3 >= num13) ? num13 : (num4 >> 3));
num2 += num13;
num -= num13;
num4 -= num13 << 3;
s.bitb = num3;
s.bitk = num4;
z.AvailableBytesIn = num2;
z.TotalBytesIn += num - z.NextIn;
z.NextIn = num;
s.writeAt = num5;
return(0);
}
