internal int Process(int r)
{
int t; // temporary storage
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
// copy input/output information to locals (UPDATE macro restores)
p = _codec.NextIn;
n = _codec.AvailableBytesIn;
b = bitb;
k = bitk;
q = writeAt;
m = (int)(q < readAt ? readAt - q - 1 : end - q);
// process input based on current state
while (true)
{
switch (mode)
{
case InflateBlockMode.TYPE:
while (k < (3))
{
if (n != 0)
{
r = ZlibConstants.Z_OK;
}
else
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
n--;
b |= (_codec.InputBuffer[p++] & 0xff) << k;
k += 8;
}
t = (int)(b & 7);
last = t & 1;
switch ((uint)t >> 1)
{
case 0: // stored
b >>= 3; k -= (3);
t = k & 7; // go to byte boundary
b >>= t; k -= t;
mode = InflateBlockMode.LENS; // get length of stored block
break;
case 1: // fixed
int[] bl = new int[1];
int[] bd = new int[1];
int[][] tl = new int[1][];
int[][] td = new int[1][];
InfTree.inflate_trees_fixed(bl, bd, tl, td, _codec);
codes.Init(bl[0], bd[0], tl[0], 0, td[0], 0);
b >>= 3; k -= 3;
mode = InflateBlockMode.CODES;
break;
case 2: // dynamic
b >>= 3; k -= 3;
mode = InflateBlockMode.TABLE;
break;
case 3: // illegal
b >>= 3; k -= 3;
mode = InflateBlockMode.BAD;
_codec.Message = "invalid block type";
r = ZlibConstants.Z_DATA_ERROR;
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
break;
case InflateBlockMode.LENS:
while (k < (32))
{
if (n != 0)
{
r = ZlibConstants.Z_OK;
}
else
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
;
n--;
b |= (_codec.InputBuffer[p++] & 0xff) << k;
k += 8;
}
if ( ( ((~b)>>16) & 0xffff) != (b & 0xffff))
{
mode = InflateBlockMode.BAD;
_codec.Message = "invalid stored block lengths";
r = ZlibConstants.Z_DATA_ERROR;
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
left = (b & 0xffff);
b = k = 0; // dump bits
mode = left != 0 ? InflateBlockMode.STORED : (last != 0 ? InflateBlockMode.DRY : InflateBlockMode.TYPE);
break;
case InflateBlockMode.STORED:
if (n == 0)
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
if (m == 0)
{
if (q == end && readAt != 0)
{
q = 0; m = (int)(q < readAt ? readAt - q - 1 : end - q);
}
if (m == 0)
{
writeAt = q;
r = Flush(r);
q = writeAt; m = (int)(q < readAt ? readAt - q - 1 : end - q);
if (q == end && readAt != 0)
{
q = 0; m = (int)(q < readAt ? readAt - q - 1 : end - q);
}
if (m == 0)
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
}
}
r = ZlibConstants.Z_OK;
t = left;
if (t > n)
t = n;
if (t > m)
t = m;
Array.Copy(_codec.InputBuffer, p, window, q, t);
p += t; n -= t;
q += t; m -= t;
if ((left -= t) != 0)
break;
mode = last != 0 ? InflateBlockMode.DRY : InflateBlockMode.TYPE;
break;
case InflateBlockMode.TABLE:
while (k < (14))
{
if (n != 0)
{
r = ZlibConstants.Z_OK;
}
else
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
n--;
b |= (_codec.InputBuffer[p++] & 0xff) << k;
k += 8;
}
table = t = (b & 0x3fff);
if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
{
mode = InflateBlockMode.BAD;
_codec.Message = "too many length or distance symbols";
r = ZlibConstants.Z_DATA_ERROR;
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
if (blens == null || blens.Length < t)
{
blens = new int[t];
}
else
{
Array.Clear(blens, 0, t);
// for (int i = 0; i < t; i++)
// {
// blens[i] = 0;
// }
}
b >>= 14;
k -= 14;
index = 0;
mode = InflateBlockMode.BTREE;
goto case InflateBlockMode.BTREE;
case InflateBlockMode.BTREE:
while (index < 4 + (table >> 10))
{
while (k < (3))
{
if (n != 0)
{
r = ZlibConstants.Z_OK;
}
else
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
n--;
b |= (_codec.InputBuffer[p++] & 0xff) << k;
k += 8;
}
blens[border[index++]] = b & 7;
b >>= 3; k -= 3;
}
while (index < 19)
{
blens[border[index++]] = 0;
}
bb[0] = 7;
t = inftree.inflate_trees_bits(blens, bb, tb, hufts, _codec);
if (t != ZlibConstants.Z_OK)
{
r = t;
if (r == ZlibConstants.Z_DATA_ERROR)
{
blens = null;
mode = InflateBlockMode.BAD;
}
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
index = 0;
mode = InflateBlockMode.DTREE;
goto case InflateBlockMode.DTREE;
case InflateBlockMode.DTREE:
while (true)
{
t = table;
if (!(index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f)))
{
break;
}
int i, j, c;
t = bb[0];
while (k < t)
{
if (n != 0)
{
r = ZlibConstants.Z_OK;
}
else
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
n--;
b |= (_codec.InputBuffer[p++] & 0xff) << k;
k += 8;
}
t = hufts[(tb[0] + (b & InternalInflateConstants.InflateMask[t])) * 3 + 1];
c = hufts[(tb[0] + (b & InternalInflateConstants.InflateMask[t])) * 3 + 2];
if (c < 16)
{
b >>= t; k -= t;
blens[index++] = c;
}
else
{
// c == 16..18
i = c == 18 ? 7 : c - 14;
j = c == 18 ? 11 : 3;
while (k < (t + i))
{
if (n != 0)
{
r = ZlibConstants.Z_OK;
}
else
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
n--;
b |= (_codec.InputBuffer[p++] & 0xff) << k;
k += 8;
}
b >>= t; k -= t;
j += (b & InternalInflateConstants.InflateMask[i]);
b >>= i; k -= i;
i = index;
t = table;
if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) || (c == 16 && i < 1))
{
blens = null;
mode = InflateBlockMode.BAD;
_codec.Message = "invalid bit length repeat";
r = ZlibConstants.Z_DATA_ERROR;
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
c = (c == 16) ? blens[i-1] : 0;
do
{
blens[i++] = c;
}
while (--j != 0);
index = i;
}
}
tb[0] = -1;
{
int[] bl = new int[] { 9 }; // must be <= 9 for lookahead assumptions
int[] bd = new int[] { 6 }; // must be <= 9 for lookahead assumptions
int[] tl = new int[1];
int[] td = new int[1];
t = table;
t = inftree.inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f), blens, bl, bd, tl, td, hufts, _codec);
if (t != ZlibConstants.Z_OK)
{
if (t == ZlibConstants.Z_DATA_ERROR)
{
blens = null;
mode = InflateBlockMode.BAD;
}
r = t;
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
codes.Init(bl[0], bd[0], hufts, tl[0], hufts, td[0]);
}
mode = InflateBlockMode.CODES;
goto case InflateBlockMode.CODES;
case InflateBlockMode.CODES:
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
r = codes.Process(this, r);
if (r != ZlibConstants.Z_STREAM_END)
{
return Flush(r);
}
r = ZlibConstants.Z_OK;
p = _codec.NextIn;
n = _codec.AvailableBytesIn;
b = bitb;
k = bitk;
q = writeAt;
m = (int)(q < readAt ? readAt - q - 1 : end - q);
if (last == 0)
{
mode = InflateBlockMode.TYPE;
break;
}
mode = InflateBlockMode.DRY;
goto case InflateBlockMode.DRY;
case InflateBlockMode.DRY:
writeAt = q;
r = Flush(r);
q = writeAt; m = (int)(q < readAt ? readAt - q - 1 : end - q);
if (readAt != writeAt)
{
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
mode = InflateBlockMode.DONE;
goto case InflateBlockMode.DONE;
case InflateBlockMode.DONE:
r = ZlibConstants.Z_STREAM_END;
bitb = b;
bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
case InflateBlockMode.BAD:
r = ZlibConstants.Z_DATA_ERROR;
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
default:
r = ZlibConstants.Z_STREAM_ERROR;
bitb = b; bitk = k;
_codec.AvailableBytesIn = n;
_codec.TotalBytesIn += p - _codec.NextIn;
_codec.NextIn = p;
writeAt = q;
return Flush(r);
}
}
}
internal int Inflate()
{
if (_codec.InputBuffer == null)
{
throw new InvalidOperationException("InputBuffer is null. ");
}
int r = RCode.BufferError;
if (!done)
{
r = blocks.Process(r);
if (r == RCode.DataError)
{
throw new InvalidDataException("Bad state");
}
if (r != RCode.StreamEnd)
{
return(r);
}
blocks.Reset();
done = true;
}
return(RCode.StreamEnd);
}
