internal int Process(InflaterBlocks s, CompressionStream z, int r)
{
int inputIndex = z.InputIndex;
int inputCount = z.InputCount;
int number = s.BitBuffer;
int bitBufferLength = s.BitBufferLength;
int num1 = s.WindowWrite;
int num2 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
while (true)
{
switch (this.mode)
{
case 0:
if (num2 >= 258 && inputCount >= 10)
{
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
r = this.InflateFast((int)this.lbits, (int)this.dbits, this.ltree, this.ltreeIndex, this.dtree, this.dtreeIndex, s, z);
inputIndex = z.InputIndex;
inputCount = z.InputCount;
number = s.BitBuffer;
bitBufferLength = s.BitBufferLength;
num1 = s.WindowWrite;
num2 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
int num3;
switch (r)
{
case 0:
goto label_6;
case 1:
num3 = 7;
break;
default:
num3 = 9;
break;
}
this.mode = num3;
break;
}
label_6:
this.need = (int)this.lbits;
this.tree = this.ltree;
this.treeIndex = this.ltreeIndex;
this.mode = 1;
goto case 1;
case 1:
int need1;
for (need1 = this.need; bitBufferLength < need1; bitBufferLength += 8)
{
if (inputCount != 0)
{
r = 0;
--inputCount;
number |= ((int)z.Input[inputIndex++] & (int)byte.MaxValue) << bitBufferLength;
}
else
{
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
}
}
int index1 = (this.treeIndex + (number & InflaterCodes.inflateMask[need1])) * 3;
number = Utils.ShiftRight(number, this.tree[index1 + 1]);
bitBufferLength -= this.tree[index1 + 1];
int num4 = this.tree[index1];
if (num4 == 0)
{
this.lit = this.tree[index1 + 2];
this.mode = 6;
break;
}
if ((num4 & 16) != 0)
{
this.getBits = num4 & 15;
this.len = this.tree[index1 + 2];
this.mode = 2;
break;
}
if ((num4 & 64) == 0)
{
this.need = num4;
this.treeIndex = index1 / 3 + this.tree[index1 + 2];
break;
}
if ((num4 & 32) != 0)
{
this.mode = 7;
break;
}
goto label_20;
case 2:
int getBits1;
for (getBits1 = this.getBits; bitBufferLength < getBits1; bitBufferLength += 8)
{
if (inputCount != 0)
{
r = 0;
--inputCount;
number |= ((int)z.Input[inputIndex++] & (int)byte.MaxValue) << bitBufferLength;
}
else
{
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
}
}
this.len += number & InflaterCodes.inflateMask[getBits1];
number >>= getBits1;
bitBufferLength -= getBits1;
this.need = (int)this.dbits;
this.tree = this.dtree;
this.treeIndex = this.dtreeIndex;
this.mode = 3;
goto case 3;
case 3:
int need2;
for (need2 = this.need; bitBufferLength < need2; bitBufferLength += 8)
{
if (inputCount != 0)
{
r = 0;
--inputCount;
number |= ((int)z.Input[inputIndex++] & (int)byte.MaxValue) << bitBufferLength;
}
else
{
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
}
}
int index2 = (this.treeIndex + (number & InflaterCodes.inflateMask[need2])) * 3;
number >>= this.tree[index2 + 1];
bitBufferLength -= this.tree[index2 + 1];
int num5 = this.tree[index2];
if ((num5 & 16) != 0)
{
this.getBits = num5 & 15;
this.dist = this.tree[index2 + 2];
this.mode = 4;
break;
}
if ((num5 & 64) == 0)
{
this.need = num5;
this.treeIndex = index2 / 3 + this.tree[index2 + 2];
break;
}
goto label_36;
case 4:
int getBits2;
for (getBits2 = this.getBits; bitBufferLength < getBits2; bitBufferLength += 8)
{
if (inputCount != 0)
{
r = 0;
--inputCount;
number |= ((int)z.Input[inputIndex++] & (int)byte.MaxValue) << bitBufferLength;
}
else
{
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
}
}
this.dist += number & InflaterCodes.inflateMask[getBits2];
number >>= getBits2;
bitBufferLength -= getBits2;
this.mode = 5;
goto case 5;
case 5:
int num6 = num1 - this.dist;
while (num6 < 0)
{
num6 += s.WindowEnd;
}
for (; this.len != 0; --this.len)
{
if (num2 == 0)
{
if (num1 == s.WindowEnd && s.WindowRead != 0)
{
num1 = 0;
num2 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
}
if (num2 == 0)
{
s.WindowWrite = num1;
r = s.InflateFlush(z, r);
num1 = s.WindowWrite;
num2 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
if (num1 == s.WindowEnd && s.WindowRead != 0)
{
num1 = 0;
num2 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
}
if (num2 == 0)
{
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
}
}
}
s.Window[num1++] = s.Window[num6++];
--num2;
if (num6 == s.WindowEnd)
{
num6 = 0;
}
}
this.mode = 0;
break;
case 6:
if (num2 == 0)
{
if (num1 == s.WindowEnd && s.WindowRead != 0)
{
num1 = 0;
num2 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
}
if (num2 == 0)
{
s.WindowWrite = num1;
r = s.InflateFlush(z, r);
num1 = s.WindowWrite;
num2 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
if (num1 == s.WindowEnd && s.WindowRead != 0)
{
num1 = 0;
num2 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
}
if (num2 == 0)
{
goto label_67;
}
}
}
r = 0;
s.Window[num1++] = (byte)this.lit;
--num2;
this.mode = 0;
break;
case 7:
goto label_70;
case 8:
goto label_75;
case 9:
goto label_76;
default:
goto label_77;
}
}
label_20:
this.mode = 9;
z.ErrorMessage = "invalid literal/length code";
r = -3;
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
label_36:
this.mode = 9;
z.ErrorMessage = "invalid distance code";
r = -3;
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
label_67:
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
label_70:
if (bitBufferLength > 7)
{
bitBufferLength -= 8;
++inputCount;
--inputIndex;
}
s.WindowWrite = num1;
r = s.InflateFlush(z, r);
num1 = s.WindowWrite;
int num7 = num1 < s.WindowRead ? s.WindowRead - num1 - 1 : s.WindowEnd - num1;
if (s.WindowRead != s.WindowWrite)
{
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
}
this.mode = 8;
label_75:
r = 1;
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
label_76:
r = -3;
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
label_77:
r = -2;
s.BitBuffer = number;
s.BitBufferLength = bitBufferLength;
z.InputCount = inputCount;
z.InputTotal += (long)(inputIndex - z.InputIndex);
z.InputIndex = inputIndex;
s.WindowWrite = num1;
return(s.InflateFlush(z, r));
}
