public ZlibCompressionState DeflateEnd()
{
if (this.Dstate == null)
{
return(ZlibCompressionState.ZSTREAMERROR);
}
ZlibCompressionState ret = this.Dstate.DeflateEnd();
this.Dstate = null;
return(ret);
}
// copy as much as possible from the sliding window to the output area
internal ZlibCompressionState Inflate_flush(ZStream z, ZlibCompressionState r)
{
int n;
int p;
int q;
// local copies of source and destination pointers
p = z.NextOutIndex;
q = this.Read;
// compute number of bytes to copy as far as end of window
n = (q <= this.Write ? this.Write : this.End) - q;
if (n > z.AvailOut)
{
n = z.AvailOut;
}
if (n != 0 && r == ZlibCompressionState.ZBUFERROR)
{
r = ZlibCompressionState.ZOK;
}
// update counters
z.AvailOut -= n;
z.TotalOut += n;
// update check information
if (this.checkfn != null)
{
z.Adler = this.check = Adler32.Calculate(this.check, this.Window, q, n);
}
// copy as far as end of window
Array.Copy(this.Window, q, z.INextOut, p, n);
p += n;
q += n;
// see if more to copy at beginning of window
if (q == this.End)
{
// wrap pointers
q = 0;
if (this.Write == this.End)
{
this.Write = 0;
}
// compute bytes to copy
n = this.Write - q;
if (n > z.AvailOut)
{
n = z.AvailOut;
}
if (n != 0 && r == ZlibCompressionState.ZBUFERROR)
{
r = ZlibCompressionState.ZOK;
}
// update counters
z.AvailOut -= n;
z.TotalOut += n;
// update check information
if (this.checkfn != null)
{
z.Adler = this.check = Adler32.Calculate(this.check, this.Window, q, n);
}
// copy
Array.Copy(this.Window, q, z.INextOut, p, n);
p += n;
q += n;
}
// update pointers
z.NextOutIndex = p;
this.Read = q;
// done
return(r);
}
internal ZlibCompressionState Proc(ZStream z, ZlibCompressionState 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 = z.NextInIndex;
n = z.AvailIn;
b = this.Bitb;
k = this.Bitk;
}
{
q = this.Write;
m = q < this.Read ? this.Read - q - 1 : this.End - q;
}
// process input based on current state
while (true)
{
switch (this.mode)
{
case TYPE:
while (k < 3)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
t = b & 7;
this.last = t & 1;
switch (SupportClass.URShift(t, 1))
{
case 0: // stored
{
b = SupportClass.URShift(b, 3);
k -= 3;
}
t = k & 7; // go to byte boundary
{
b = SupportClass.URShift(b, t);
k -= t;
}
this.mode = LENS; // get length of stored block
break;
case 1: // fixed
{
var bl = new int[1];
var bd = new int[1];
var tl = new int[1][];
var td = new int[1][];
_ = InfTree.Inflate_trees_fixed(bl, bd, tl, td);
this.codes = new InfCodes(bl[0], bd[0], tl[0], td[0]);
}
{
b = SupportClass.URShift(b, 3);
k -= 3;
}
this.mode = CODES;
break;
case 2: // dynamic
{
b = SupportClass.URShift(b, 3);
k -= 3;
}
this.mode = TABLE;
break;
case 3: // illegal
{
b = SupportClass.URShift(b, 3);
k -= 3;
}
this.mode = BAD;
z.Msg = "invalid block type";
r = ZlibCompressionState.ZDATAERROR;
this.Bitb = b; this.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
break;
case LENS:
while (k < 32)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
if ((SupportClass.URShift(~b, 16) & 0xffff) != (b & 0xffff))
{
this.mode = BAD;
z.Msg = "invalid stored block lengths";
r = ZlibCompressionState.ZDATAERROR;
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
this.left = b & 0xffff;
b = k = 0; // dump bits
this.mode = this.left != 0 ? STORED : (this.last != 0 ? DRY : TYPE);
break;
case STORED:
if (n == 0)
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
if (m == 0)
{
if (q == this.End && this.Read != 0)
{
q = 0;
m = q < this.Read ? this.Read - q - 1 : this.End - q;
}
if (m == 0)
{
this.Write = q;
r = this.Inflate_flush(z, r);
q = this.Write;
m = q < this.Read ? this.Read - q - 1 : this.End - q;
if (q == this.End && this.Read != 0)
{
q = 0;
m = q < this.Read ? this.Read - q - 1 : this.End - q;
}
if (m == 0)
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
}
}
r = ZlibCompressionState.ZOK;
t = this.left;
if (t > n)
{
t = n;
}
if (t > m)
{
t = m;
}
Array.Copy(z.INextIn, p, this.Window, q, t);
p += t; n -= t;
q += t; m -= t;
if ((this.left -= t) != 0)
{
break;
}
this.mode = this.last != 0 ? DRY : TYPE;
break;
case TABLE:
while (k < 14)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
this.table = t = b & 0x3fff;
if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
{
this.mode = BAD;
z.Msg = "too many length or distance symbols";
r = ZlibCompressionState.ZDATAERROR;
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
this.blens = new int[t];
{
b = SupportClass.URShift(b, 14);
k -= 14;
}
this.index = 0;
this.mode = BTREE;
goto case BTREE;
case BTREE:
while (this.index < 4 + SupportClass.URShift(this.table, 10))
{
while (k < 3)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
this.blens[Border[this.index++]] = b & 7;
{
b = SupportClass.URShift(b, 3);
k -= 3;
}
}
while (this.index < 19)
{
this.blens[Border[this.index++]] = 0;
}
this.bb[0] = 7;
t = (int)InfTree.Inflate_trees_bits(this.blens, this.bb, this.tb, this.hufts, z);
if (t != (int)ZlibCompressionState.ZOK)
{
r = (ZlibCompressionState)t;
if (r == ZlibCompressionState.ZDATAERROR)
{
this.blens = null;
this.mode = BAD;
}
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
this.index = 0;
this.mode = DTREE;
goto case DTREE;
case DTREE:
while (true)
{
t = this.table;
if (!(this.index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f)))
{
break;
}
int i, j, c;
t = this.bb[0];
while (k < t)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
if (this.tb[0] == -1)
{
// System.err.println("null...");
}
t = this.hufts[((this.tb[0] + (b & InflateMask[t])) * 3) + 1];
c = this.hufts[((this.tb[0] + (b & InflateMask[t])) * 3) + 2];
if (c < 16)
{
b = SupportClass.URShift(b, t);
k -= t;
this.blens[this.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 = ZlibCompressionState.ZOK;
}
else
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
b = SupportClass.URShift(b, t);
k -= t;
j += b & InflateMask[i];
b = SupportClass.URShift(b, i);
k -= i;
i = this.index;
t = this.table;
if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) || (c == 16 && i < 1))
{
this.blens = null;
this.mode = BAD;
z.Msg = "invalid bit length repeat";
r = ZlibCompressionState.ZDATAERROR;
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
c = c == 16 ? this.blens[i - 1] : 0;
do
{
this.blens[i++] = c;
}while (--j != 0);
this.index = i;
}
}
this.tb[0] = -1;
{
var bl = new int[1];
var bd = new int[1];
var tl = new int[1];
var td = new int[1];
bl[0] = 9; // must be <= 9 for lookahead assumptions
bd[0] = 6; // must be <= 9 for lookahead assumptions
t = this.table;
t = (int)InfTree.Inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f), this.blens, bl, bd, tl, td, this.hufts, z);
if (t != (int)ZlibCompressionState.ZOK)
{
if (t == (int)ZlibCompressionState.ZDATAERROR)
{
this.blens = null;
this.mode = BAD;
}
r = (ZlibCompressionState)t;
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
this.codes = new InfCodes(bl[0], bd[0], this.hufts, tl[0], this.hufts, td[0]);
}
this.blens = null;
this.mode = CODES;
goto case CODES;
case CODES:
this.Bitb = b; this.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
this.Write = q;
if ((r = this.codes.Proc(this, z, r)) != ZlibCompressionState.ZSTREAMEND)
{
return(this.Inflate_flush(z, r));
}
r = ZlibCompressionState.ZOK;
InfCodes.Free();
p = z.NextInIndex; n = z.AvailIn; b = this.Bitb; k = this.Bitk;
q = this.Write; m = q < this.Read ? this.Read - q - 1 : this.End - q;
if (this.last == 0)
{
this.mode = TYPE;
break;
}
this.mode = DRY;
goto case DRY;
case DRY:
this.Write = q;
r = this.Inflate_flush(z, r);
q = this.Write; m = q < this.Read ? this.Read - q - 1 : this.End - q;
if (this.Read != this.Write)
{
this.Bitb = b;
this.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
this.mode = DONE;
goto case DONE;
case DONE:
r = ZlibCompressionState.ZSTREAMEND;
this.Bitb = b; this.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
case BAD:
r = ZlibCompressionState.ZDATAERROR;
this.Bitb = b; this.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
default:
r = ZlibCompressionState.ZSTREAMERROR;
this.Bitb = b; this.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
this.Write = q;
return(this.Inflate_flush(z, r));
}
}
}
internal ZlibCompressionState Proc(InfBlocks s, ZStream z, ZlibCompressionState r)
{
int j; // temporary storage
// int[] t; // temporary pointer
int tindex; // temporary pointer
int e; // extra bits or operation
var b = 0; // bit buffer
var k = 0; // bits in bit buffer
var 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
// copy input/output information to locals (UPDATE macro restores)
p = z.NextInIndex;
n = z.AvailIn;
b = s.Bitb;
k = s.Bitk;
q = s.Write;
m = q < s.Read ? s.Read - q - 1 : s.End - q;
// process input and output based on current state
while (true)
{
switch (this.Mode)
{
// waiting for "i:"=input, "o:"=output, "x:"=nothing
case START: // x: set up for LEN
if (m >= 258 && n >= 10)
{
s.Bitb = b;
s.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
s.Write = q;
r = Inflate_fast(this.Lbits, this.Dbits, this.Ltree, this.LtreeIndex, this.Dtree, this.DtreeIndex, s, z);
p = z.NextInIndex;
n = z.AvailIn;
b = s.Bitb;
k = s.Bitk;
q = s.Write;
m = q < s.Read ? s.Read - q - 1 : s.End - q;
if (r != ZlibCompressionState.ZOK)
{
this.Mode = r == ZlibCompressionState.ZSTREAMEND ? WASH : BADCODE;
break;
}
}
this.Need = this.Lbits;
this.Tree = this.Ltree;
this.TreeIndex = this.LtreeIndex;
this.Mode = LEN;
goto case LEN;
case LEN: // i: get length/literal/eob next
j = this.Need;
while (k < j)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
s.Bitb = b;
s.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
tindex = (this.TreeIndex + (b & InflateMask[j])) * 3;
b = SupportClass.URShift(b, this.Tree[tindex + 1]);
k -= this.Tree[tindex + 1];
e = this.Tree[tindex];
if (e == 0)
{
// literal
this.Lit = this.Tree[tindex + 2];
this.Mode = LIT;
break;
}
if ((e & 16) != 0)
{
// length
this.GetRenamed = e & 15;
this.Len = this.Tree[tindex + 2];
this.Mode = LENEXT;
break;
}
if ((e & 64) == 0)
{
// next table
this.Need = e;
this.TreeIndex = (tindex / 3) + this.Tree[tindex + 2];
break;
}
if ((e & 32) != 0)
{
// end of block
this.Mode = WASH;
break;
}
this.Mode = BADCODE; // invalid code
z.Msg = "invalid literal/length code";
r = ZlibCompressionState.ZDATAERROR;
s.Bitb = b; s.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
case LENEXT: // i: getting length extra (have base)
j = this.GetRenamed;
while (k < j)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
s.Bitb = b;
s.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
this.Len += b & InflateMask[j];
b >>= j;
k -= j;
this.Need = this.Dbits;
this.Tree = this.Dtree;
this.TreeIndex = this.DtreeIndex;
this.Mode = DIST;
goto case DIST;
case DIST: // i: get distance next
j = this.Need;
while (k < j)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
s.Bitb = b;
s.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
tindex = (this.TreeIndex + (b & InflateMask[j])) * 3;
b >>= this.Tree[tindex + 1];
k -= this.Tree[tindex + 1];
e = this.Tree[tindex];
if ((e & 16) != 0)
{
// distance
this.GetRenamed = e & 15;
this.Dist = this.Tree[tindex + 2];
this.Mode = DISTEXT;
break;
}
if ((e & 64) == 0)
{
// next table
this.Need = e;
this.TreeIndex = (tindex / 3) + this.Tree[tindex + 2];
break;
}
this.Mode = BADCODE; // invalid code
z.Msg = "invalid distance code";
r = ZlibCompressionState.ZDATAERROR;
s.Bitb = b; s.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
case DISTEXT: // i: getting distance extra
j = this.GetRenamed;
while (k < j)
{
if (n != 0)
{
r = ZlibCompressionState.ZOK;
}
else
{
s.Bitb = b;
s.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
}
n--;
b |= (z.INextIn[p++] & 0xff) << k;
k += 8;
}
this.Dist += b & InflateMask[j];
b >>= j;
k -= j;
this.Mode = COPY;
goto case COPY;
case COPY: // o: copying bytes in window, waiting for space
f = q - this.Dist;
while (f < 0)
{
// modulo window size-"while" instead
f += s.End; // of "if" handles invalid distances
}
while (this.Len != 0)
{
if (m == 0)
{
if (q == s.End && s.Read != 0)
{
q = 0;
m = q < s.Read ? s.Read - q - 1 : s.End - q;
}
if (m == 0)
{
s.Write = q;
r = s.Inflate_flush(z, r);
q = s.Write;
m = q < s.Read ? s.Read - q - 1 : s.End - q;
if (q == s.End && s.Read != 0)
{
q = 0;
m = q < s.Read ? s.Read - q - 1 : s.End - q;
}
if (m == 0)
{
s.Bitb = b;
s.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
}
}
}
s.Window[q++] = s.Window[f++];
m--;
if (f == s.End)
{
f = 0;
}
this.Len--;
}
this.Mode = START;
break;
case LIT: // o: got literal, waiting for output space
if (m == 0)
{
if (q == s.End && s.Read != 0)
{
q = 0;
m = q < s.Read ? s.Read - q - 1 : s.End - q;
}
if (m == 0)
{
s.Write = q;
r = s.Inflate_flush(z, r);
q = s.Write;
m = q < s.Read ? s.Read - q - 1 : s.End - q;
if (q == s.End && s.Read != 0)
{
q = 0;
m = q < s.Read ? s.Read - q - 1 : s.End - q;
}
if (m == 0)
{
s.Bitb = b;
s.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
}
}
}
r = ZlibCompressionState.ZOK;
s.Window[q++] = (byte)this.Lit; m--;
this.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
}
s.Write = q; r = s.Inflate_flush(z, r);
q = s.Write; m = q < s.Read ? s.Read - q - 1 : s.End - q;
if (s.Read != s.Write)
{
s.Bitb = b;
s.Bitk = k;
z.AvailIn = n;
z.TotalIn += p - z.NextInIndex;
z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
}
this.Mode = END;
goto case END;
case END:
r = ZlibCompressionState.ZSTREAMEND;
s.Bitb = b; s.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
case BADCODE: // x: got error
r = ZlibCompressionState.ZDATAERROR;
s.Bitb = b; s.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
default:
r = ZlibCompressionState.ZSTREAMERROR;
s.Bitb = b; s.Bitk = k;
z.AvailIn = n; z.TotalIn += p - z.NextInIndex; z.NextInIndex = p;
s.Write = q;
return(s.Inflate_flush(z, r));
}
}
}