internal InfBlocks(ZStream z, System.Object checkfn, int w)
{
hufts = new int[MANY * 3];
window = new byte[w];
end = w;
this.checkfn = checkfn;
mode = TYPE;
reset(z, null);
}
internal static int inflate_trees_dynamic(int nl, int nd, int[] c, int[] bl, int[] bd, int[] tl, int[] td, int[] hp, ZStream z)
{
int r;
int[] hn = new int[1]; // hufts used in space
int[] v = new int[288]; // work area for huft_build
// build literal/length tree
r = huft_build(c, 0, nl, 257, cplens, cplext, tl, bl, hp, hn, v);
if (r != Z_OK || bl[0] == 0)
{
if (r == Z_DATA_ERROR)
{
z.msg = "oversubscribed literal/length tree";
}
else if (r != Z_MEM_ERROR)
{
z.msg = "incomplete literal/length tree";
r = Z_DATA_ERROR;
}
return r;
}
// build distance tree
r = huft_build(c, nl, nd, 0, cpdist, cpdext, td, bd, hp, hn, v);
if (r != Z_OK || (bd[0] == 0 && nl > 257))
{
if (r == Z_DATA_ERROR)
{
z.msg = "oversubscribed distance tree";
}
else if (r == Z_BUF_ERROR)
{
z.msg = "incomplete distance tree";
r = Z_DATA_ERROR;
}
else if (r != Z_MEM_ERROR)
{
z.msg = "empty distance tree with lengths";
r = Z_DATA_ERROR;
}
return r;
}
return Z_OK;
}
internal static int inflate_trees_fixed(int[] bl, int[] bd, int[][] tl, int[][] td, ZStream z)
{
bl[0] = fixed_bl;
bd[0] = fixed_bd;
tl[0] = fixed_tl;
td[0] = fixed_td;
return Z_OK;
}
// Returns true if inflate is currently at the end of a block generated
// by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
// implementation to provide an additional safety check. PPP uses Z_SYNC_FLUSH
// but removes the length bytes of the resulting empty stored block. When
// decompressing, PPP checks that at the end of input packet, inflate is
// waiting for these length bytes.
internal int inflateSyncPoint(ZStream z)
{
if (z == null || z.istate == null || z.istate.blocks == null)
return Z_STREAM_ERROR;
return z.istate.blocks.sync_point();
}
internal static int inflate_trees_bits(int[] c, int[] bb, int[] tb, int[] hp, ZStream z)
{
int r;
int[] hn = new int[1]; // hufts used in space
int[] v = new int[19]; // work area for huft_build
r = huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);
if (r == Z_DATA_ERROR)
{
z.msg = "oversubscribed dynamic bit lengths tree";
}
else if (r == Z_BUF_ERROR || bb[0] == 0)
{
z.msg = "incomplete dynamic bit lengths tree";
r = Z_DATA_ERROR;
}
return r;
}
internal int proc(ZStream z, 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 = z.next_in_index; n = z.avail_in; b = bitb; k = bitk;
}
{
q = write; m = (int) (q < read?read - q - 1:end - q);
}
// process input based on current state
while (true)
{
switch (mode)
{
case TYPE:
while (k < (3))
{
if (n != 0)
{
r = Z_OK;
}
else
{
bitb = b; bitk = k;
z.avail_in = n;
z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
;
n--;
b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
t = (int) (b & 7);
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);
}
mode = 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, z);
codes = new InfCodes(bl[0], bd[0], tl[0], td[0], z);
}
{
b = SupportClass.URShift(b, (3)); k -= (3);
}
mode = CODES;
break;
case 2: // dynamic
{
b = SupportClass.URShift(b, (3)); k -= (3);
}
mode = TABLE;
break;
case 3: // illegal
{
b = SupportClass.URShift(b, (3)); k -= (3);
}
mode = BAD;
z.msg = "invalid block type";
r = Z_DATA_ERROR;
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
break;
case LENS:
while (k < (32))
{
if (n != 0)
{
r = Z_OK;
}
else
{
bitb = b; bitk = k;
z.avail_in = n;
z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
;
n--;
b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
if (((SupportClass.URShift((~ b), 16)) & 0xffff) != (b & 0xffff))
{
mode = BAD;
z.msg = "invalid stored block lengths";
r = Z_DATA_ERROR;
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
left = (b & 0xffff);
b = k = 0; // dump bits
mode = left != 0?STORED:(last != 0?DRY:TYPE);
break;
case STORED:
if (n == 0)
{
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
if (m == 0)
{
if (q == end && read != 0)
{
q = 0; m = (int) (q < read?read - q - 1:end - q);
}
if (m == 0)
{
write = q;
r = inflate_flush(z, r);
q = write; m = (int) (q < read?read - q - 1:end - q);
if (q == end && read != 0)
{
q = 0; m = (int) (q < read?read - q - 1:end - q);
}
if (m == 0)
{
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
}
}
r = Z_OK;
t = left;
if (t > n)
t = n;
if (t > m)
t = m;
Array.Copy(z.next_in, p, window, q, t);
p += t; n -= t;
q += t; m -= t;
if ((left -= t) != 0)
break;
mode = last != 0?DRY:TYPE;
break;
case TABLE:
while (k < (14))
{
if (n != 0)
{
r = Z_OK;
}
else
{
bitb = b; bitk = k;
z.avail_in = n;
z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
;
n--;
b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
table = t = (b & 0x3fff);
if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
{
mode = BAD;
z.msg = "too many length or distance symbols";
r = Z_DATA_ERROR;
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
blens = new int[t];
{
b = SupportClass.URShift(b, (14)); k -= (14);
}
index = 0;
mode = BTREE;
goto case BTREE;
case BTREE:
while (index < 4 + (SupportClass.URShift(table, 10)))
{
while (k < (3))
{
if (n != 0)
{
r = Z_OK;
}
else
{
bitb = b; bitk = k;
z.avail_in = n;
z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
;
n--;
b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
blens[border[index++]] = b & 7;
{
b = SupportClass.URShift(b, (3)); k -= (3);
}
}
while (index < 19)
{
blens[border[index++]] = 0;
}
bb[0] = 7;
t = InfTree.inflate_trees_bits(blens, bb, tb, hufts, z);
if (t != Z_OK)
{
r = t;
if (r == Z_DATA_ERROR)
{
blens = null;
mode = BAD;
}
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
index = 0;
mode = DTREE;
goto case DTREE;
case 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 = Z_OK;
}
else
{
bitb = b; bitk = k;
z.avail_in = n;
z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
;
n--;
b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
if (tb[0] == - 1)
{
//System.err.println("null...");
}
t = hufts[(tb[0] + (b & inflate_mask[t])) * 3 + 1];
c = hufts[(tb[0] + (b & inflate_mask[t])) * 3 + 2];
if (c < 16)
{
b = SupportClass.URShift(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 = Z_OK;
}
else
{
bitb = b; bitk = k;
z.avail_in = n;
z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
;
n--;
b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
b = SupportClass.URShift(b, (t)); k -= (t);
j += (b & inflate_mask[i]);
b = SupportClass.URShift(b, (i)); k -= (i);
i = index;
t = table;
if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) || (c == 16 && i < 1))
{
blens = null;
mode = BAD;
z.msg = "invalid bit length repeat";
r = Z_DATA_ERROR;
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
c = c == 16?blens[i - 1]:0;
do
{
blens[i++] = c;
}
while (--j != 0);
index = i;
}
}
tb[0] = - 1;
{
int[] bl = new int[1];
int[] bd = new int[1];
int[] tl = new int[1];
int[] td = new int[1];
bl[0] = 9; // must be <= 9 for lookahead assumptions
bd[0] = 6; // must be <= 9 for lookahead assumptions
t = table;
t = InfTree.inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f), blens, bl, bd, tl, td, hufts, z);
if (t != Z_OK)
{
if (t == Z_DATA_ERROR)
{
blens = null;
mode = BAD;
}
r = t;
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
codes = new InfCodes(bl[0], bd[0], hufts, tl[0], hufts, td[0], z);
}
blens = null;
mode = CODES;
goto case CODES;
case CODES:
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
if ((r = codes.proc(this, z, r)) != Z_STREAM_END)
{
return inflate_flush(z, r);
}
r = Z_OK;
codes.free(z);
p = z.next_in_index; n = z.avail_in; b = bitb; k = bitk;
q = write; m = (int) (q < read?read - q - 1:end - q);
if (last == 0)
{
mode = TYPE;
break;
}
mode = DRY;
goto case DRY;
case DRY:
write = q;
r = inflate_flush(z, r);
q = write; m = (int) (q < read?read - q - 1:end - q);
if (read != write)
{
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
mode = DONE;
goto case DONE;
case DONE:
r = Z_STREAM_END;
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
case BAD:
r = Z_DATA_ERROR;
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
default:
r = Z_STREAM_ERROR;
bitb = b; bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
write = q;
return inflate_flush(z, r);
}
}
}
internal void free(ZStream z)
{
// ZFREE(z, c);
}
internal int inflateInit(ZStream z, int w)
{
z.msg = 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)
{
inflateEnd(z);
return Z_STREAM_ERROR;
}
wbits = w;
z.istate.blocks = new InfBlocks(z, z.istate.nowrap != 0?null:this, 1 << w);
// reset state
inflateReset(z);
return Z_OK;
}
internal int inflateReset(ZStream z)
{
if (z == null || z.istate == null)
return Z_STREAM_ERROR;
z.total_in = z.total_out = 0;
z.msg = null;
z.istate.mode = z.istate.nowrap != 0?BLOCKS:METHOD;
z.istate.blocks.reset(z, null);
return Z_OK;
}
internal int inflate(ZStream z, int f)
{
int r;
int b;
if (z == null || z.istate == null || z.next_in == null)
return Z_STREAM_ERROR;
f = f == Z_FINISH?Z_BUF_ERROR:Z_OK;
r = Z_BUF_ERROR;
while (true)
{
//System.out.println("mode: "+z.istate.mode);
switch (z.istate.mode)
{
case METHOD:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
if (((z.istate.method = z.next_in[z.next_in_index++]) & 0xf) != Z_DEFLATED)
{
z.istate.mode = BAD;
z.msg = "unknown compression method";
z.istate.marker = 5; // can't try inflateSync
break;
}
if ((z.istate.method >> 4) + 8 > z.istate.wbits)
{
z.istate.mode = BAD;
z.msg = "invalid window size";
z.istate.marker = 5; // can't try inflateSync
break;
}
z.istate.mode = FLAG;
goto case FLAG;
case FLAG:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
b = (z.next_in[z.next_in_index++]) & 0xff;
if ((((z.istate.method << 8) + b) % 31) != 0)
{
z.istate.mode = BAD;
z.msg = "incorrect header check";
z.istate.marker = 5; // can't try inflateSync
break;
}
if ((b & PRESET_DICT) == 0)
{
z.istate.mode = BLOCKS;
break;
}
z.istate.mode = DICT4;
goto case DICT4;
case DICT4:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need = ((z.next_in[z.next_in_index++] & 0xff) << 24) & unchecked((int) 0xff000000L);
z.istate.mode = DICT3;
goto case DICT3;
case DICT3:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 16) & 0xff0000L);
z.istate.mode = DICT2;
goto case DICT2;
case DICT2:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 8) & 0xff00L);
z.istate.mode = DICT1;
goto case DICT1;
case DICT1:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (z.next_in[z.next_in_index++] & 0xffL);
z.adler = z.istate.need;
z.istate.mode = DICT0;
return Z_NEED_DICT;
case DICT0:
z.istate.mode = BAD;
z.msg = "need dictionary";
z.istate.marker = 0; // can try inflateSync
return Z_STREAM_ERROR;
case BLOCKS:
r = z.istate.blocks.proc(z, r);
if (r == Z_DATA_ERROR)
{
z.istate.mode = BAD;
z.istate.marker = 0; // can try inflateSync
break;
}
if (r == Z_OK)
{
r = f;
}
if (r != Z_STREAM_END)
{
return r;
}
r = f;
z.istate.blocks.reset(z, z.istate.was);
if (z.istate.nowrap != 0)
{
z.istate.mode = DONE;
break;
}
z.istate.mode = CHECK4;
goto case CHECK4;
case CHECK4:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need = ((z.next_in[z.next_in_index++] & 0xff) << 24) & unchecked((int) 0xff000000L);
z.istate.mode = CHECK3;
goto case CHECK3;
case CHECK3:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 16) & 0xff0000L);
z.istate.mode = CHECK2;
goto case CHECK2;
case CHECK2:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 8) & 0xff00L);
z.istate.mode = CHECK1;
goto case CHECK1;
case CHECK1:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (z.next_in[z.next_in_index++] & 0xffL);
if (((int) (z.istate.was[0])) != ((int) (z.istate.need)))
{
z.istate.mode = BAD;
z.msg = "incorrect data check";
z.istate.marker = 5; // can't try inflateSync
break;
}
z.istate.mode = DONE;
goto case DONE;
case DONE:
return Z_STREAM_END;
case BAD:
return Z_DATA_ERROR;
default:
return Z_STREAM_ERROR;
}
}
}
internal int inflateEnd(ZStream z)
{
if (blocks != null)
blocks.free(z);
blocks = null;
// ZFREE(z, z->state);
return Z_OK;
}
public virtual void end()
{
if (compress)
{
z.deflateEnd();
}
else
{
z.inflateEnd();
}
z.free();
z = null;
}
internal int proc(InfBlocks s, ZStream z, int r)
{
int j; // temporary storage
//int[] t; // temporary pointer
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
// copy input/output information to locals (UPDATE macro restores)
p = z.next_in_index; n = z.avail_in; 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 (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.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
r = inflate_fast(lbits, dbits, ltree, ltree_index, dtree, dtree_index, s, z);
p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk;
q = s.write; m = q < s.read?s.read - q - 1:s.end - q;
if (r != Z_OK)
{
mode = r == 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 = Z_OK;
else
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
}
n--;
b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
tindex = (tree_index + (b & inflate_mask[j])) * 3;
b = SupportClass.URShift(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
get_Renamed = 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.msg = "invalid literal/length code";
r = Z_DATA_ERROR;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
case LENEXT: // i: getting length extra (have base)
j = get_Renamed;
while (k < (j))
{
if (n != 0)
r = Z_OK;
else
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
}
n--; b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
len += (b & inflate_mask[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 = Z_OK;
else
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
}
n--; b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
tindex = (tree_index + (b & inflate_mask[j])) * 3;
b >>= tree[tindex + 1];
k -= tree[tindex + 1];
e = (tree[tindex]);
if ((e & 16) != 0)
{
// distance
get_Renamed = 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.msg = "invalid distance code";
r = Z_DATA_ERROR;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
case DISTEXT: // i: getting distance extra
j = get_Renamed;
while (k < (j))
{
if (n != 0)
r = Z_OK;
else
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
}
n--; b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
dist += (b & inflate_mask[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 += s.end; // of "if" handles invalid distances
}
while (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.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
}
}
}
s.window[q++] = s.window[f++]; m--;
if (f == s.end)
f = 0;
len--;
}
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.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
}
}
}
r = Z_OK;
s.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
}
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.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
}
mode = END;
goto case END;
case END:
r = Z_STREAM_END;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
case BADCODE: // x: got error
r = Z_DATA_ERROR;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
default:
r = Z_STREAM_ERROR;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return s.inflate_flush(z, r);
}
}
}
// 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 inflate_fast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InfBlocks s, ZStream 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
// load input, output, bit values
p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk;
q = s.write; m = q < s.read?s.read - q - 1:s.end - q;
// initialize masks
ml = inflate_mask[bl];
md = inflate_mask[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.next_in[p++] & 0xff) << k; k += 8;
}
t = b & ml;
tp = tl;
tp_index = tl_index;
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 & inflate_mask[e]);
b >>= e; k -= e;
// decode distance base of block to copy
while (k < (15))
{
// max bits for distance code
n--;
b |= (z.next_in[p++] & 0xff) << k; k += 8;
}
t = b & md;
tp = td;
tp_index = td_index;
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.next_in[p++] & 0xff) << k; k += 8;
}
d = tp[(tp_index + t) * 3 + 2] + (b & inflate_mask[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++]; c--; // minimum count is three,
s.window[q++] = s.window[r++]; c--; // so unroll loop a little
}
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 & inflate_mask[e]);
e = tp[(tp_index + t) * 3];
}
else
{
z.msg = "invalid distance code";
c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= (c << 3);
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return Z_DATA_ERROR;
}
}
while (true);
break;
}
if ((e & 64) == 0)
{
t += tp[(tp_index + t) * 3 + 2];
t += (b & inflate_mask[e]);
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.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= (c << 3);
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return Z_STREAM_END;
}
else
{
z.msg = "invalid literal/length code";
c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= (c << 3);
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return Z_DATA_ERROR;
}
}
while (true);
}
while (m >= 258 && n >= 10);
// not enough input or output--restore pointers and return
c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= (c << 3);
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return Z_OK;
}
internal void free(ZStream z)
{
reset(z, null);
window = null;
hufts = null;
//ZFREE(z, s);
}
internal int inflateSetDictionary(ZStream z, byte[] dictionary, int dictLength)
{
int index = 0;
int length = dictLength;
if (z == null || z.istate == null || z.istate.mode != DICT0)
return Z_STREAM_ERROR;
if (z._adler.adler32(1L, dictionary, 0, dictLength) != z.adler)
{
return Z_DATA_ERROR;
}
z.adler = z._adler.adler32(0, null, 0, 0);
if (length >= (1 << z.istate.wbits))
{
length = (1 << z.istate.wbits) - 1;
index = dictLength - length;
}
z.istate.blocks.set_dictionary(dictionary, index, length);
z.istate.mode = BLOCKS;
return Z_OK;
}
// copy as much as possible from the sliding window to the output area
internal int inflate_flush(ZStream z, int r)
{
int n;
int p;
int q;
// local copies of source and destination pointers
p = z.next_out_index;
q = read;
// compute number of bytes to copy as far as end of window
n = (int) ((q <= write?write:end) - q);
if (n > z.avail_out)
n = z.avail_out;
if (n != 0 && r == Z_BUF_ERROR)
r = Z_OK;
// update counters
z.avail_out -= n;
z.total_out += n;
// update check information
if (checkfn != null)
z.adler = check = z._adler.adler32(check, window, q, n);
// copy as far as end of window
Array.Copy(window, q, z.next_out, p, n);
p += n;
q += n;
// see if more to copy at beginning of window
if (q == end)
{
// wrap pointers
q = 0;
if (write == end)
write = 0;
// compute bytes to copy
n = write - q;
if (n > z.avail_out)
n = z.avail_out;
if (n != 0 && r == Z_BUF_ERROR)
r = Z_OK;
// update counters
z.avail_out -= n;
z.total_out += n;
// update check information
if (checkfn != null)
z.adler = check = z._adler.adler32(check, window, q, n);
// copy
Array.Copy(window, q, z.next_out, p, n);
p += n;
q += n;
}
// update pointers
z.next_out_index = p;
read = q;
// done
return r;
}
internal int inflateSync(ZStream z)
{
int n; // number of bytes to look at
int p; // pointer to bytes
int m; // number of marker bytes found in a row
long r, w; // temporaries to save total_in and total_out
// set up
if (z == null || z.istate == null)
return Z_STREAM_ERROR;
if (z.istate.mode != BAD)
{
z.istate.mode = BAD;
z.istate.marker = 0;
}
if ((n = z.avail_in) == 0)
return Z_BUF_ERROR;
p = z.next_in_index;
m = z.istate.marker;
// search
while (n != 0 && m < 4)
{
if (z.next_in[p] == mark[m])
{
m++;
}
else if (z.next_in[p] != 0)
{
m = 0;
}
else
{
m = 4 - m;
}
p++; n--;
}
// restore
z.total_in += p - z.next_in_index;
z.next_in_index = p;
z.avail_in = n;
z.istate.marker = m;
// return no joy or set up to restart on a new block
if (m != 4)
{
return Z_DATA_ERROR;
}
r = z.total_in; w = z.total_out;
inflateReset(z);
z.total_in = r; z.total_out = w;
z.istate.mode = BLOCKS;
return Z_OK;
}
internal void reset(ZStream z, long[] c)
{
if (c != null)
c[0] = check;
if (mode == BTREE || mode == DTREE)
{
blens = null;
}
if (mode == CODES)
{
codes.free(z);
}
mode = TYPE;
bitk = 0;
bitb = 0;
read = write = 0;
if (checkfn != null)
z.adler = check = z._adler.adler32(0L, null, 0, 0);
}
internal InfCodes(int bl, int bd, int[] tl, int[] td, ZStream z)
{
mode = START;
lbits = (byte) bl;
dbits = (byte) bd;
ltree = tl;
ltree_index = 0;
dtree = td;
dtree_index = 0;
}