public ZlibStream(Stream innerStream)
{
_innerStream = innerStream;
if(_innerStream.CanRead)
{
_in = new ZStream();
int ret = _in.inflateInit();
if (ret != zlibConst.Z_OK)
throw new ZStreamException("Unable to initialize inflate");
_inBuff = new byte[_buffSize];
_in.avail_in = 0;
_in.next_in = _inBuff;
_in.next_in_index = 0;
}
if(_innerStream.CanWrite)
{
_out = new ZStream();
int ret = _out.deflateInit(zlibConst.Z_DEFAULT_COMPRESSION);
if (ret != zlibConst.Z_OK)
throw new ZStreamException("Unable to initialize deflate");
_outBuff = new byte[_buffSize];
_out.next_out = _outBuff;
}
}
internal int inflateEnd(ZStream z)
{
if (blocks != null)
blocks.free(z);
blocks = null;
// ZFREE(z, z->state);
return Z_OK;
}
internal long check; // check on output
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 InfCodes(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, ZStream z)
{
this.mode = 0;
this.lbits = (byte) bl;
this.dbits = (byte) bd;
this.ltree = tl;
this.ltree_index = tl_index;
this.dtree = td;
this.dtree_index = td_index;
}
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;
}
internal InfBlocks blocks; // current inflate_blocks state
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 InfBlocks(ZStream z, object checkfn, int w)
{
this.bb = new int[1];
this.tb = new int[1];
this.hufts = new int[0x10e0];
this.window = new byte[w];
this.end = w;
this.checkfn = checkfn;
this.mode = 0;
this.reset(z, null);
}
internal int inflate_flush(ZStream z, int r)
{
int num2 = z.next_out_index;
int num3 = this.read;
int num1 = ((num3 <= this.write) ? this.write : this.end) - num3;
if (num1 > z.avail_out)
{
num1 = z.avail_out;
}
if ((num1 != 0) && (r == -5))
{
r = 0;
}
z.avail_out -= num1;
z.total_out += num1;
if (this.checkfn != null)
{
z.adler = this.check = z._adler.adler32(this.check, this.window, num3, num1);
}
Array.Copy(this.window, num3, z.next_out, num2, num1);
num2 += num1;
num3 += num1;
if (num3 == this.end)
{
num3 = 0;
if (this.write == this.end)
{
this.write = 0;
}
num1 = this.write - num3;
if (num1 > z.avail_out)
{
num1 = z.avail_out;
}
if ((num1 != 0) && (r == -5))
{
r = 0;
}
z.avail_out -= num1;
z.total_out += num1;
if (this.checkfn != null)
{
z.adler = this.check = z._adler.adler32(this.check, this.window, num3, num1);
}
Array.Copy(this.window, num3, z.next_out, num2, num1);
num2 += num1;
num3 += num1;
}
z.next_out_index = num2;
this.read = num3;
return r;
}
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 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 int deflate(ZStream strm, int flush)
{
int old_flush;
if (flush > Z_FINISH || flush < 0)
{
return Z_STREAM_ERROR;
}
if (strm.next_out == null || (strm.next_in == null && strm.avail_in != 0) || (status == FINISH_STATE && flush != Z_FINISH))
{
strm.msg = z_errmsg[Z_NEED_DICT - (Z_STREAM_ERROR)];
return Z_STREAM_ERROR;
}
if (strm.avail_out == 0)
{
strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
return Z_BUF_ERROR;
}
this.strm = strm; // just in case
old_flush = last_flush;
last_flush = flush;
// Write the zlib header
if (status == INIT_STATE)
{
int header = (Z_DEFLATED + ((w_bits - 8) << 4)) << 8;
int level_flags = ((level - 1) & 0xff) >> 1;
if (level_flags > 3)
level_flags = 3;
header |= (level_flags << 6);
if (strstart != 0)
header |= PRESET_DICT;
header += 31 - (header % 31);
status = BUSY_STATE;
putShortMSB(header);
// Save the adler32 of the preset dictionary:
if (strstart != 0)
{
putShortMSB((int) (SupportClass.URShift(strm.adler, 16)));
putShortMSB((int) (strm.adler & 0xffff));
}
strm.adler = strm._adler.adler32(0, null, 0, 0);
}
// Flush as much pending output as possible
if (pending != 0)
{
strm.flush_pending();
if (strm.avail_out == 0)
{
//System.out.println(" avail_out==0");
// Since avail_out is 0, deflate will be called again with
// more output space, but possibly with both pending and
// avail_in equal to zero. There won't be anything to do,
// but this is not an error situation so make sure we
// return OK instead of BUF_ERROR at next call of deflate:
last_flush = - 1;
return Z_OK;
}
// Make sure there is something to do and avoid duplicate consecutive
// flushes. For repeated and useless calls with Z_FINISH, we keep
// returning Z_STREAM_END instead of Z_BUFF_ERROR.
}
else if (strm.avail_in == 0 && flush <= old_flush && flush != Z_FINISH)
{
strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
return Z_BUF_ERROR;
}
// User must not provide more input after the first FINISH:
if (status == FINISH_STATE && strm.avail_in != 0)
{
strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
return Z_BUF_ERROR;
}
// Start a new block or continue the current one.
if (strm.avail_in != 0 || lookahead != 0 || (flush != Z_NO_FLUSH && status != FINISH_STATE))
{
int bstate = - 1;
switch (config_table[level].func)
{
case STORED:
bstate = deflate_stored(flush);
break;
case FAST:
bstate = deflate_fast(flush);
break;
case SLOW:
bstate = deflate_slow(flush);
break;
default:
break;
}
if (bstate == FinishStarted || bstate == FinishDone)
{
status = FINISH_STATE;
}
if (bstate == NeedMore || bstate == FinishStarted)
{
if (strm.avail_out == 0)
{
last_flush = - 1; // avoid BUF_ERROR next call, see above
}
return Z_OK;
// If flush != Z_NO_FLUSH && avail_out == 0, the next call
// of deflate should use the same flush parameter to make sure
// that the flush is complete. So we don't have to output an
// empty block here, this will be done at next call. This also
// ensures that for a very small output buffer, we emit at most
// one empty block.
}
if (bstate == BlockDone)
{
if (flush == Z_PARTIAL_FLUSH)
{
_tr_align();
}
else
{
// FULL_FLUSH or SYNC_FLUSH
_tr_stored_block(0, 0, false);
// For a full flush, this empty block will be recognized
// as a special marker by inflate_sync().
if (flush == Z_FULL_FLUSH)
{
//state.head[s.hash_size-1]=0;
for (int i = 0; i < hash_size; i++)
// forget history
head[i] = 0;
}
}
strm.flush_pending();
if (strm.avail_out == 0)
{
last_flush = - 1; // avoid BUF_ERROR at next call, see above
return Z_OK;
}
}
}
if (flush != Z_FINISH)
return Z_OK;
if (noheader != 0)
return Z_STREAM_END;
// Write the zlib trailer (adler32)
putShortMSB((int) (SupportClass.URShift(strm.adler, 16)));
putShortMSB((int) (strm.adler & 0xffff));
strm.flush_pending();
// If avail_out is zero, the application will call deflate again
// to flush the rest.
noheader = - 1; // write the trailer only once!
return pending != 0?Z_OK:Z_STREAM_END;
}
internal int deflateParams(ZStream strm, int _level, int _strategy)
{
int err = Z_OK;
if (_level == Z_DEFAULT_COMPRESSION)
{
_level = 6;
}
if (_level < 0 || _level > 9 || _strategy < 0 || _strategy > Z_HUFFMAN_ONLY)
{
return Z_STREAM_ERROR;
}
if (config_table[level].func != config_table[_level].func && strm.total_in != 0)
{
// Flush the last buffer:
err = strm.deflate(Z_PARTIAL_FLUSH);
}
if (level != _level)
{
level = _level;
max_lazy_match = config_table[level].max_lazy;
good_match = config_table[level].good_length;
nice_match = config_table[level].nice_length;
max_chain_length = config_table[level].max_chain;
}
strategy = _strategy;
return err;
}
internal int deflateInit2(ZStream strm, int level, int method, int windowBits, int memLevel, int strategy)
{
int noheader = 0;
// byte[] my_version=ZLIB_VERSION;
//
// if (version == null || version[0] != my_version[0]
// || stream_size != sizeof(z_stream)) {
// return Z_VERSION_ERROR;
// }
strm.msg = null;
if (level == Z_DEFAULT_COMPRESSION)
level = 6;
if (windowBits < 0)
{
// undocumented feature: suppress zlib header
noheader = 1;
windowBits = - windowBits;
}
if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || windowBits < 9 || windowBits > 15 || level < 0 || level > 9 || strategy < 0 || strategy > Z_HUFFMAN_ONLY)
{
return Z_STREAM_ERROR;
}
strm.dstate = (Deflate) this;
this.noheader = noheader;
w_bits = windowBits;
w_size = 1 << w_bits;
w_mask = w_size - 1;
hash_bits = memLevel + 7;
hash_size = 1 << hash_bits;
hash_mask = hash_size - 1;
hash_shift = ((hash_bits + MIN_MATCH - 1) / MIN_MATCH);
window = new byte[w_size * 2];
prev = new short[w_size];
head = new short[hash_size];
lit_bufsize = 1 << (memLevel + 6); // 16K elements by default
// We overlay pending_buf and d_buf+l_buf. This works since the average
// output size for (length,distance) codes is <= 24 bits.
pending_buf = new byte[lit_bufsize * 4];
pending_buf_size = lit_bufsize * 4;
d_buf = lit_bufsize / 2;
l_buf = (1 + 2) * lit_bufsize;
this.level = level;
//System.out.println("level="+level);
this.strategy = strategy;
this.method = (byte) method;
return deflateReset(strm);
}
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);
}
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);
}
}
}
// 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;
}
// 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 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 InfCodes(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, ZStream z)
{
this.mode = 0;
this.lbits = (byte)bl;
this.dbits = (byte)bd;
this.ltree = tl;
this.ltree_index = tl_index;
this.dtree = td;
this.dtree_index = td_index;
}
internal int inflate_fast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InfBlocks s, ZStream z)
{
int num = z.next_in_index;
int num2 = z.avail_in;
int num3 = s.bitb;
int i = s.bitk;
int num4 = s.write;
int num5 = (num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4);
int num6 = InfCodes.inflate_mask[bl];
int num7 = InfCodes.inflate_mask[bd];
int num9;
int num10;
while (true)
{
if (i >= 20)
{
int num8 = num3 & num6;
if ((num9 = tl[(tl_index + num8) * 3]) == 0)
{
num3 >>= tl[(tl_index + num8) * 3 + 1];
i -= tl[(tl_index + num8) * 3 + 1];
s.window[num4++] = (byte)tl[(tl_index + num8) * 3 + 2];
num5--;
}
else
{
while (true)
{
num3 >>= tl[(tl_index + num8) * 3 + 1];
i -= tl[(tl_index + num8) * 3 + 1];
if ((num9 & 16) != 0)
{
break;
}
if ((num9 & 64) != 0)
{
goto IL_4D3;
}
num8 += tl[(tl_index + num8) * 3 + 2];
num8 += (num3 & InfCodes.inflate_mask[num9]);
if ((num9 = tl[(tl_index + num8) * 3]) == 0)
{
goto Block_20;
}
}
num9 &= 15;
num10 = tl[(tl_index + num8) * 3 + 2] + (num3 & InfCodes.inflate_mask[num9]);
num3 >>= num9;
for (i -= num9; i < 15; i += 8)
{
num2--;
num3 |= (int)(z.next_in[num++] & 255) << i;
}
num8 = (num3 & num7);
num9 = td[(td_index + num8) * 3];
while (true)
{
num3 >>= td[(td_index + num8) * 3 + 1];
i -= td[(td_index + num8) * 3 + 1];
if ((num9 & 16) != 0)
{
break;
}
if ((num9 & 64) != 0)
{
goto IL_3D9;
}
num8 += td[(td_index + num8) * 3 + 2];
num8 += (num3 & InfCodes.inflate_mask[num9]);
num9 = td[(td_index + num8) * 3];
}
num9 &= 15;
while (i < num9)
{
num2--;
num3 |= (int)(z.next_in[num++] & 255) << i;
i += 8;
}
int num11 = td[(td_index + num8) * 3 + 2] + (num3 & InfCodes.inflate_mask[num9]);
num3 >>= num9;
i -= num9;
num5 -= num10;
int num12;
if (num4 >= num11)
{
num12 = num4 - num11;
if (num4 - num12 > 0 && 2 > num4 - num12)
{
s.window[num4++] = s.window[num12++];
num10--;
s.window[num4++] = s.window[num12++];
num10--;
}
else
{
Array.Copy(s.window, num12, s.window, num4, 2);
num4 += 2;
num12 += 2;
num10 -= 2;
}
}
else
{
num12 = num4 - num11;
do
{
num12 += s.end;
}while (num12 < 0);
num9 = s.end - num12;
if (num10 > num9)
{
num10 -= num9;
if (num4 - num12 > 0 && num9 > num4 - num12)
{
do
{
s.window[num4++] = s.window[num12++];
}while (--num9 != 0);
}
else
{
Array.Copy(s.window, num12, s.window, num4, num9);
num4 += num9;
num12 += num9;
}
num12 = 0;
}
}
if (num4 - num12 > 0 && num10 > num4 - num12)
{
do
{
s.window[num4++] = s.window[num12++];
}while (--num10 != 0);
goto IL_5E0;
}
Array.Copy(s.window, num12, s.window, num4, num10);
num4 += num10;
num12 += num10;
goto IL_5E0;
Block_20:
num3 >>= tl[(tl_index + num8) * 3 + 1];
i -= tl[(tl_index + num8) * 3 + 1];
s.window[num4++] = (byte)tl[(tl_index + num8) * 3 + 2];
num5--;
}
IL_5E0:
if (num5 < 258 || num2 < 10)
{
goto IL_5F2;
}
}
else
{
num2--;
num3 |= (int)(z.next_in[num++] & 255) << i;
i += 8;
}
}
IL_3D9:
z.msg = "invalid distance code";
num10 = z.avail_in - num2;
num10 = ((i >> 3 < num10) ? (i >> 3) : num10);
num2 += num10;
num -= num10;
i -= num10 << 3;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(-3);
IL_4D3:
if ((num9 & 32) != 0)
{
num10 = z.avail_in - num2;
num10 = ((i >> 3 < num10) ? (i >> 3) : num10);
num2 += num10;
num -= num10;
i -= num10 << 3;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(1);
}
z.msg = "invalid literal/length code";
num10 = z.avail_in - num2;
num10 = ((i >> 3 < num10) ? (i >> 3) : num10);
num2 += num10;
num -= num10;
i -= num10 << 3;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(-3);
IL_5F2:
num10 = z.avail_in - num2;
num10 = ((i >> 3 < num10) ? (i >> 3) : num10);
num2 += num10;
num -= num10;
i -= num10 << 3;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(0);
}
internal void free(ZStream z)
{
}
internal int proc(InfBlocks s, ZStream z, int r)
{
int num = z.next_in_index;
int num2 = z.avail_in;
int num3 = s.bitb;
int i = s.bitk;
int num4 = s.write;
int num5 = (num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4);
while (true)
{
int num6;
switch (this.mode)
{
case 0:
if (num5 >= 258 && num2 >= 10)
{
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
r = this.inflate_fast((int)this.lbits, (int)this.dbits, this.ltree, this.ltree_index, this.dtree, this.dtree_index, s, z);
num = z.next_in_index;
num2 = z.avail_in;
num3 = s.bitb;
i = s.bitk;
num4 = s.write;
num5 = ((num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4));
if (r != 0)
{
this.mode = ((r == 1) ? 7 : 9);
continue;
}
}
this.need = (int)this.lbits;
this.tree = this.ltree;
this.tree_index = this.ltree_index;
this.mode = 1;
goto IL_199;
case 1:
goto IL_199;
case 2:
num6 = this.get_Renamed;
while (i < num6)
{
if (num2 == 0)
{
goto IL_34F;
}
r = 0;
num2--;
num3 |= (int)(z.next_in[num++] & 255) << i;
i += 8;
}
this.len += (num3 & InfCodes.inflate_mask[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_412;
case 3:
goto IL_412;
case 4:
num6 = this.get_Renamed;
while (i < num6)
{
if (num2 == 0)
{
goto IL_596;
}
r = 0;
num2--;
num3 |= (int)(z.next_in[num++] & 255) << i;
i += 8;
}
this.dist += (num3 & InfCodes.inflate_mask[num6]);
num3 >>= num6;
i -= num6;
this.mode = 5;
goto IL_635;
case 5:
goto IL_635;
case 6:
if (num5 == 0)
{
if (num4 == s.end && s.read != 0)
{
num4 = 0;
num5 = ((num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4));
}
if (num5 == 0)
{
s.write = num4;
r = s.inflate_flush(z, r);
num4 = s.write;
num5 = ((num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4));
if (num4 == s.end && s.read != 0)
{
num4 = 0;
num5 = ((num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4));
}
if (num5 == 0)
{
goto Block_44;
}
}
}
r = 0;
s.window[num4++] = (byte)this.lit;
num5--;
this.mode = 0;
continue;
case 7:
goto IL_8DB;
case 8:
goto IL_98A;
case 9:
goto IL_9D4;
}
break;
IL_199:
num6 = this.need;
while (i < num6)
{
if (num2 == 0)
{
goto IL_1AB;
}
r = 0;
num2--;
num3 |= (int)(z.next_in[num++] & 255) << i;
i += 8;
}
int num7 = (this.tree_index + (num3 & InfCodes.inflate_mask[num6])) * 3;
num3 = SupportClass.URShift(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.get_Renamed = (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_2DF;
IL_412:
num6 = this.need;
while (i < num6)
{
if (num2 == 0)
{
goto IL_424;
}
r = 0;
num2--;
num3 |= (int)(z.next_in[num++] & 255) << i;
i += 8;
}
num7 = (this.tree_index + (num3 & InfCodes.inflate_mask[num6])) * 3;
num3 >>= this.tree[num7 + 1];
i -= this.tree[num7 + 1];
num8 = this.tree[num7];
if ((num8 & 16) != 0)
{
this.get_Renamed = (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_526;
IL_635:
int j;
for (j = num4 - this.dist; j < 0; j += s.end)
{
}
while (this.len != 0)
{
if (num5 == 0)
{
if (num4 == s.end && s.read != 0)
{
num4 = 0;
num5 = ((num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4));
}
if (num5 == 0)
{
s.write = num4;
r = s.inflate_flush(z, r);
num4 = s.write;
num5 = ((num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4));
if (num4 == s.end && s.read != 0)
{
num4 = 0;
num5 = ((num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4));
}
if (num5 == 0)
{
goto Block_32;
}
}
}
s.window[num4++] = s.window[j++];
num5--;
if (j == s.end)
{
j = 0;
}
this.len--;
}
this.mode = 0;
}
r = -2;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
IL_1AB:
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
IL_2DF:
this.mode = 9;
z.msg = "invalid literal/length code";
r = -3;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
IL_34F:
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
IL_424:
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
IL_526:
this.mode = 9;
z.msg = "invalid distance code";
r = -3;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
IL_596:
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
Block_32:
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
Block_44:
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
IL_8DB:
if (i > 7)
{
i -= 8;
num2++;
num--;
}
s.write = num4;
r = s.inflate_flush(z, r);
num4 = s.write;
int arg_92C_0 = (num4 < s.read) ? (s.read - num4 - 1) : (s.end - num4);
if (s.read != s.write)
{
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
}
this.mode = 8;
IL_98A:
r = 1;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
IL_9D4:
r = -3;
s.bitb = num3;
s.bitk = i;
z.avail_in = num2;
z.total_in += (long)(num - z.next_in_index);
z.next_in_index = num;
s.write = num4;
return(s.inflate_flush(z, r));
}
IEnumerable<WebSocketsFrame> IExtension.ApplyOutgoing(NetContext context, WebSocketConnection connection, WebSocketsFrame frame)
{
if (!frame.IsControlFrame && frame.PayloadLength > parent.compressMessagesLargerThanBytes)
{
if (frame.Reserved1)
{
throw new InvalidOperationException("Reserved1 flag is already set; extension conflict?");
}
int headerBytes = 0;
if (outbound == null)
{
outbound = new ZStream();
const int BITS = 12; // 4096 byte outbound buffer (instead of full 32k=15)
outbound.deflateInit(zlibConst.Z_BEST_COMPRESSION, BITS);
headerBytes = 2;
}
BufferStream tmp = null;
var payload = frame.Payload;
payload.Position = 0;
byte[] inBuffer = null, outBuffer = null;
try
{
inBuffer = context.GetBuffer();
outBuffer = context.GetBuffer();
tmp = new BufferStream(context, 0);
outbound.next_out = outBuffer;
outbound.next_in = inBuffer;
int remaining = frame.PayloadLength;
while (remaining > 0)
{
int readCount = payload.Read(inBuffer, 0, inBuffer.Length);
if (readCount <= 0) break;
remaining -= readCount;
outbound.next_in_index = 0;
outbound.avail_in = readCount;
do
{
outbound.next_out_index = 0;
outbound.avail_out = outBuffer.Length;
long priorOut = outbound.total_out;
int err = outbound.deflate(remaining == 0 ? zlibConst.Z_SYNC_FLUSH : zlibConst.Z_NO_FLUSH);
if (err != zlibConst.Z_OK && err != zlibConst.Z_STREAM_END)
throw new ZStreamException("deflating: " + outbound.msg);
int outCount = (int)(outbound.total_out - priorOut);
if (outCount > 0)
{
if (headerBytes == 0)
{
tmp.Write(outBuffer, 0, outCount);
}
else
{
if (outCount < headerBytes)
{
throw new InvalidOperationException("Failed to write entire header");
}
// check the generated header meets our expectations
// CMF is very specific - CM must be 8, and CINFO must be <=7 (for 32k window)
if ((outBuffer[0] & 15) != 8)
{
throw new InvalidOperationException("Zlib CM header was incorrect");
}
if ((outBuffer[0] & 128) != 0) // if msb set, is > 7 - invalid
{
throw new InvalidOperationException("Zlib CINFO header was incorrect");
}
// FLG is less important; FCHECK is irrelevent, FLEVEL doesn't matter; but
// FDICT must be zero, to ensure that we aren't expecting a an initialization dictionary
if ((outBuffer[1] & 32) != 0)
{
throw new InvalidOperationException("Zlib FLG.FDICT header was set (must not be)");
}
// skip the header, and write anything else
outCount -= headerBytes;
if (outCount > 0)
{
tmp.Write(outBuffer, headerBytes, outCount);
}
headerBytes = 0; // all written now
}
}
} while (outbound.avail_in > 0 || outbound.avail_out == 0);
}
if (remaining != 0) throw new EndOfStreamException();
if (headerBytes != 0) throw new InvalidOperationException("Zlib header was not written");
// verify the last 4 bytes, then drop them
tmp.Position = tmp.Length - 4;
NetContext.Fill(tmp, outBuffer, 4);
if (!(outBuffer[0] == 0x00 && outBuffer[1] == 0x00 && outBuffer[2] == 0xFF && outBuffer[3] == 0xFF))
{
throw new InvalidOperationException("expectation failed: 0000FFFF in the tail");
}
if (parent.disableContextTakeover && tmp.Length >= frame.PayloadLength)
{ // compressing it didn't do anything useful; since we're going to discard
// the compression context, we might as well stick with the original data
payload.Position = 0;
payload = null; // so that it doesn't get disposed
}
else
{
// set our final output
tmp.Position = 0;
tmp.SetLength(tmp.Length - 4);
long bytesSaved = frame.PayloadLength - tmp.Length;
frame.Payload = tmp;
frame.PayloadLength = (int)tmp.Length;
frame.Reserved1 = true;
tmp = payload as BufferStream;
parent.RegisterOutboundBytesSaved(bytesSaved);
}
}
#if DEBUG
catch (Exception ex)
{
Debug.WriteLine(ex);
throw;
}
#endif
finally
{
if (outbound != null)
{
outbound.next_out = null;
outbound.next_in = null;
}
if (tmp != null) tmp.Dispose();
if (inBuffer != null) context.Recycle(inBuffer);
if (outBuffer != null) context.Recycle(outBuffer);
if (parent.disableContextTakeover) ClearContext(false, true);
}
}
yield return frame;
}
IEnumerable<WebSocketsFrame> IExtension.ApplyIncoming(NetContext context, WebSocketConnection connection, WebSocketsFrame frame)
{
if (frame.Reserved1 && !frame.IsControlFrame)
{
BufferStream tmp = null;
var payload = frame.Payload;
payload.Position = 0;
byte[] inBuffer = null, outBuffer = null;
try
{
outBuffer = context.GetBuffer();
inBuffer = context.GetBuffer();
tmp = new BufferStream(context, 0);
if (inbound == null)
{
inbound = new ZStream();
inbound.inflateInit();
// fake a zlib header with:
// CMF:
// CM = 8 (deflate)
// CINFO = 7 (32k window)
// FLG:
// FCHECK: 26 (checksum of other bits)
// FDICT: 0 (no dictionary)
// FLEVEL: 3 (maximum)
inBuffer[0] = 120;
inBuffer[1] = 218;
inbound.next_in = inBuffer;
int chk = Inflate(tmp, outBuffer, 2);
if (chk != 0) throw new InvalidOperationException("Spoofed zlib header suggested data");
}
inbound.next_in = inBuffer;
int remaining = frame.PayloadLength;
//bool first = true;
while (remaining > 0)
{
int readCount = payload.Read(inBuffer, 0, inBuffer.Length);
if (readCount <= 0) break;
remaining -= readCount;
//if (first)
//{ // kill the BFINAL flag from the first block, if set; we don't want zlib
// // trying to verify the ADLER checksum; unfortunately, a frame can contain
// // multiple blocks, and a *later* block could have BFINAL set. That sucks.
// inBuffer[0] &= 254;
// first = false;
//}
Inflate(tmp, outBuffer, readCount);
}
if (remaining != 0) throw new EndOfStreamException();
// spoof the missing 4 bytes from the tail
inBuffer[0] = inBuffer[1] = 0x00;
inBuffer[2] = inBuffer[3] = 0xFF;
Inflate(tmp, outBuffer, 4);
// set our final output
tmp.Position = 0;
frame.Payload = tmp;
long bytesSaved = tmp.Length - frame.PayloadLength;
frame.PayloadLength = (int)tmp.Length;
frame.Reserved1 = false;
tmp = payload as BufferStream;
parent.RegisterInboundBytesSaved(bytesSaved);
}
#if DEBUG
catch (Exception ex)
{
Debug.WriteLine(ex);
throw;
}
#endif
finally
{
if (inbound != null)
{
inbound.next_out = null;
inbound.next_in = null;
}
if (tmp != null) tmp.Dispose();
if (inBuffer != null) context.Recycle(inBuffer);
if (outBuffer != null) context.Recycle(outBuffer);
if (parent.disableContextTakeover) ClearContext(true, false);
}
}
yield return frame;
}
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 static int inflate_trees_dynamic(int nl, int nd, int[] c, int[] bl, int[] bd, int[] tl, int[] td, int[] hp, ZStream z)
{
int[] hn = new int[1];
int[] v = new int[288];
int num = InfTree.huft_build(c, 0, nl, 257, InfTree.cplens, InfTree.cplext, tl, bl, hp, hn, v);
if (num != 0 || bl[0] == 0)
{
if (num == -3)
{
z.msg = "oversubscribed literal/length tree";
}
else
{
if (num != -4)
{
z.msg = "incomplete literal/length tree";
num = -3;
}
}
return(num);
}
num = InfTree.huft_build(c, nl, nd, 0, InfTree.cpdist, InfTree.cpdext, td, bd, hp, hn, v);
if (num != 0 || (bd[0] == 0 && nl > 257))
{
if (num == -3)
{
z.msg = "oversubscribed distance tree";
}
else
{
if (num == -5)
{
z.msg = "incomplete distance tree";
num = -3;
}
else
{
if (num != -4)
{
z.msg = "empty distance tree with lengths";
num = -3;
}
}
}
return(num);
}
return(0);
}
internal int inflate(ZStream z, int f)
{
if (z == null || z.istate == null || z.next_in == null)
{
return(-2);
}
f = ((f == 4) ? -5 : 0);
int num = -5;
while (true)
{
switch (z.istate.mode)
{
case 0:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
if (((z.istate.method = (int)z.next_in[z.next_in_index++]) & 15) != 8)
{
z.istate.mode = 13;
z.msg = "unknown compression method";
z.istate.marker = 5;
continue;
}
if ((z.istate.method >> 4) + 8 > z.istate.wbits)
{
z.istate.mode = 13;
z.msg = "invalid window size";
z.istate.marker = 5;
continue;
}
z.istate.mode = 1;
goto IL_144;
case 1:
goto IL_144;
case 2:
goto IL_1EE;
case 3:
goto IL_258;
case 4:
goto IL_2CA;
case 5:
goto IL_33B;
case 6:
goto IL_3B7;
case 7:
num = z.istate.blocks.proc(z, num);
if (num == -3)
{
z.istate.mode = 13;
z.istate.marker = 0;
continue;
}
if (num == 0)
{
num = f;
}
if (num != 1)
{
return(num);
}
num = f;
z.istate.blocks.reset(z, z.istate.was);
if (z.istate.nowrap != 0)
{
z.istate.mode = 12;
continue;
}
z.istate.mode = 8;
goto IL_468;
case 8:
goto IL_468;
case 9:
goto IL_4D3;
case 10:
goto IL_546;
case 11:
goto IL_5B8;
case 12:
return(1);
case 13:
return(-3);
}
break;
IL_144:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
int num2 = (int)(z.next_in[z.next_in_index++] & 255);
if (((z.istate.method << 8) + num2) % 31 != 0)
{
z.istate.mode = 13;
z.msg = "incorrect header check";
z.istate.marker = 5;
continue;
}
if ((num2 & 32) == 0)
{
z.istate.mode = 7;
continue;
}
goto IL_1E2;
IL_5B8:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
z.istate.need += (long)((ulong)z.next_in[z.next_in_index++] & 255uL);
if ((int)z.istate.was[0] != (int)z.istate.need)
{
z.istate.mode = 13;
z.msg = "incorrect data check";
z.istate.marker = 5;
continue;
}
goto IL_65A;
IL_546:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
z.istate.need += ((long)((long)(z.next_in[z.next_in_index++] & 255) << 8) & 65280L);
z.istate.mode = 11;
goto IL_5B8;
IL_4D3:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
z.istate.need += ((long)((long)(z.next_in[z.next_in_index++] & 255) << 16) & 16711680L);
z.istate.mode = 10;
goto IL_546;
IL_468:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
z.istate.need = (long)((int)(z.next_in[z.next_in_index++] & 255) << 24 & -16777216);
z.istate.mode = 9;
goto IL_4D3;
}
return(-2);
IL_1E2:
z.istate.mode = 2;
IL_1EE:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
z.istate.need = (long)((int)(z.next_in[z.next_in_index++] & 255) << 24 & -16777216);
z.istate.mode = 3;
IL_258:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
z.istate.need += ((long)((long)(z.next_in[z.next_in_index++] & 255) << 16) & 16711680L);
z.istate.mode = 4;
IL_2CA:
if (z.avail_in == 0)
{
return(num);
}
num = f;
z.avail_in--;
z.total_in += 1L;
z.istate.need += ((long)((long)(z.next_in[z.next_in_index++] & 255) << 8) & 65280L);
z.istate.mode = 5;
IL_33B:
if (z.avail_in == 0)
{
return(num);
}
z.avail_in--;
z.total_in += 1L;
z.istate.need += (long)((ulong)z.next_in[z.next_in_index++] & 255uL);
z.adler = z.istate.need;
z.istate.mode = 6;
return(2);
IL_3B7:
z.istate.mode = 13;
z.msg = "need dictionary";
z.istate.marker = 0;
return(-2);
IL_65A:
z.istate.mode = 12;
return(1);
}
public virtual void end()
{
if (compress)
{
z.deflateEnd();
}
else
{
z.inflateEnd();
}
z.free();
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] = 9;
bd[0] = 5;
tl[0] = InfTree.fixed_tl;
td[0] = InfTree.fixed_td;
return(0);
}
// 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 deflateSetDictionary(ZStream strm, byte[] dictionary, int dictLength)
{
int num1 = dictLength;
int num2 = 0;
if ((dictionary == null) || (this.status != 0x2a))
{
return -2;
}
strm.adler = strm._adler.adler32(strm.adler, dictionary, 0, dictLength);
if (num1 >= 3)
{
if (num1 > (this.w_size - Deflate.MIN_LOOKAHEAD))
{
num1 = this.w_size - Deflate.MIN_LOOKAHEAD;
num2 = dictLength - num1;
}
Array.Copy(dictionary, num2, this.window, 0, num1);
this.strstart = num1;
this.block_start = num1;
this.ins_h = this.window[0] & 0xff;
this.ins_h = ((this.ins_h << (this.hash_shift & 0x1f)) ^ (this.window[1] & 0xff)) & this.hash_mask;
for (int num3 = 0; num3 <= (num1 - 3); num3++)
{
this.ins_h = ((this.ins_h << (this.hash_shift & 0x1f)) ^ (this.window[num3 + 2] & 0xff)) & this.hash_mask;
this.prev[num3 & this.w_mask] = this.head[this.ins_h];
this.head[this.ins_h] = (short) num3;
}
}
return 0;
}
internal int deflateInit(ZStream strm, int level, int bits)
{
return deflateInit2(strm, level, Z_DEFLATED, bits, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
}
internal void free(ZStream z)
{
reset(z, null);
window = null;
hufts = null;
//ZFREE(z, s);
}
internal int deflate(ZStream strm, int flush)
{
if ((flush > 4) || (flush < 0))
{
return(-2);
}
if (((strm.next_out == null) || ((strm.next_in == null) && (strm.avail_in != 0))) || ((this.status == 0x29a) && (flush != 4)))
{
strm.msg = Deflate.z_errmsg[4];
return(-2);
}
if (strm.avail_out == 0)
{
strm.msg = Deflate.z_errmsg[7];
return(-5);
}
this.strm = strm;
int num1 = this.last_flush;
this.last_flush = flush;
if (this.status == 0x2a)
{
int num2 = (8 + ((this.w_bits - 8) << 4)) << 8;
int num3 = ((this.level - 1) & 0xff) >> 1;
if (num3 > 3)
{
num3 = 3;
}
num2 |= num3 << 6;
if (this.strstart != 0)
{
num2 |= 0x20;
}
num2 += 0x1f - (num2 % 0x1f);
this.status = 0x71;
this.putShortMSB(num2);
if (this.strstart != 0)
{
this.putShortMSB((int)SupportClass.URShift(strm.adler, 0x10));
this.putShortMSB(((int)strm.adler) & 0xffff);
}
strm.adler = strm._adler.adler32((long)0, null, 0, 0);
}
if (this.pending != 0)
{
strm.flush_pending();
if (strm.avail_out == 0)
{
this.last_flush = -1;
return(0);
}
}
else if (((strm.avail_in == 0) && (flush <= num1)) && (flush != 4))
{
strm.msg = Deflate.z_errmsg[7];
return(-5);
}
if ((this.status == 0x29a) && (strm.avail_in != 0))
{
strm.msg = Deflate.z_errmsg[7];
return(-5);
}
if (((strm.avail_in != 0) || (this.lookahead != 0)) || ((flush != 0) && (this.status != 0x29a)))
{
int num4 = -1;
switch (Deflate.config_table[this.level].func)
{
case 0:
num4 = this.deflate_stored(flush);
break;
case 1:
num4 = this.deflate_fast(flush);
break;
case 2:
num4 = this.deflate_slow(flush);
break;
}
switch (num4)
{
case 2:
case 3:
this.status = 0x29a;
break;
}
switch (num4)
{
case 0:
case 2:
if (strm.avail_out == 0)
{
this.last_flush = -1;
}
return(0);
default:
if (num4 == 1)
{
if (flush == 1)
{
this._tr_align();
}
else
{
this._tr_stored_block(0, 0, false);
if (flush == 3)
{
for (int num5 = 0; num5 < this.hash_size; num5++)
{
this.head[num5] = 0;
}
}
}
strm.flush_pending();
if (strm.avail_out == 0)
{
this.last_flush = -1;
return(0);
}
}
break;
}
}
if (flush == 4)
{
if (this.noheader != 0)
{
return(1);
}
this.putShortMSB((int)SupportClass.URShift(strm.adler, 0x10));
this.putShortMSB(((int)strm.adler) & 0xffff);
strm.flush_pending();
this.noheader = -1;
if (this.pending == 0)
{
return(1);
}
}
return(0);
}
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 int deflateInit(ZStream strm, int level)
{
return(this.deflateInit(strm, level, 15));
}
internal int deflateInit(ZStream strm, int level)
{
return deflateInit(strm, level, MAX_WBITS);
}
internal int deflateInit(ZStream strm, int level, int bits)
{
return(this.deflateInit2(strm, level, 8, bits, 8, 0));
}
internal int deflateReset(ZStream strm)
{
strm.total_in = strm.total_out = 0;
strm.msg = null; //
strm.data_type = Z_UNKNOWN;
pending = 0;
pending_out = 0;
if (noheader < 0)
{
noheader = 0; // was set to -1 by deflate(..., Z_FINISH);
}
status = (noheader != 0)?BUSY_STATE:INIT_STATE;
strm.adler = strm._adler.adler32(0, null, 0, 0);
last_flush = Z_NO_FLUSH;
tr_init();
lm_init();
return Z_OK;
}
internal void free(ZStream z)
{
this.reset(z, null);
this.window = null;
this.hufts = null;
}
internal int deflateSetDictionary(ZStream strm, byte[] dictionary, int dictLength)
{
int length = dictLength;
int index = 0;
if (dictionary == null || status != INIT_STATE)
return Z_STREAM_ERROR;
strm.adler = strm._adler.adler32(strm.adler, dictionary, 0, dictLength);
if (length < MIN_MATCH)
return Z_OK;
if (length > w_size - MIN_LOOKAHEAD)
{
length = w_size - MIN_LOOKAHEAD;
index = dictLength - length; // use the tail of the dictionary
}
Array.Copy(dictionary, index, window, 0, length);
strstart = length;
block_start = length;
// Insert all strings in the hash table (except for the last two bytes).
// s->lookahead stays null, so s->ins_h will be recomputed at the next
// call of fill_window.
ins_h = window[0] & 0xff;
ins_h = (((ins_h) << hash_shift) ^ (window[1] & 0xff)) & hash_mask;
for (int n = 0; n <= length - MIN_MATCH; n++)
{
ins_h = (((ins_h) << hash_shift) ^ (window[(n) + (MIN_MATCH - 1)] & 0xff)) & hash_mask;
prev[n & w_mask] = head[ins_h];
head[ins_h] = (short) n;
}
return Z_OK;
}
internal int proc(ZStream z, int r)
{
int num1;
int num4 = z.next_in_index;
int num5 = z.avail_in;
int num2 = this.bitb;
int num3 = this.bitk;
int num6 = this.write;
int num7 = (num6 < this.read) ? ((this.read - num6) - 1) : (this.end - num6);
Label_0047:
switch (this.mode)
{
case 0:
while (num3 < 3)
{
if (num5 != 0)
{
r = 0;
}
else
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
num5--;
num2 |= (z.next_in[num4++] & 0xff) << (num3 & 0x1f);
num3 += 8;
}
num1 = num2 & 7;
this.last = num1 & 1;
switch (SupportClass.URShift(num1, 1))
{
case 0:
num2 = SupportClass.URShift(num2, 3);
num3 -= 3;
num1 = num3 & 7;
num2 = SupportClass.URShift(num2, num1);
num3 -= num1;
this.mode = 1;
goto Label_0047;
case 1:
{
int[] numArray1 = new int[1];
int[] numArray2 = new int[1];
int[][] numArrayArray1 = new int[1][];
int[][] numArrayArray2 = new int[1][];
InfTree.inflate_trees_fixed(numArray1, numArray2, numArrayArray1, numArrayArray2, z);
this.codes = new InfCodes(numArray1[0], numArray2[0], numArrayArray1[0], numArrayArray2[0], z);
num2 = SupportClass.URShift(num2, 3);
num3 -= 3;
this.mode = 6;
goto Label_0047;
}
case 2:
num2 = SupportClass.URShift(num2, 3);
num3 -= 3;
this.mode = 3;
goto Label_0047;
case 3:
num2 = SupportClass.URShift(num2, 3);
num3 -= 3;
this.mode = 9;
z.msg = "invalid block type";
r = -3;
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
goto Label_0047;
case 1:
while (num3 < 0x20)
{
if (num5 != 0)
{
r = 0;
}
else
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
num5--;
num2 |= (z.next_in[num4++] & 0xff) << (num3 & 0x1f);
num3 += 8;
}
if ((SupportClass.URShift(~num2, 0x10) & 0xffff) != (num2 & 0xffff))
{
this.mode = 9;
z.msg = "invalid stored block lengths";
r = -3;
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
this.left = num2 & 0xffff;
num2 = num3 = 0;
this.mode = (this.left != 0) ? 2 : ((this.last != 0) ? 7 : 0);
goto Label_0047;
case 2:
if (num5 == 0)
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
if (num7 == 0)
{
if ((num6 == this.end) && (this.read != 0))
{
num6 = 0;
num7 = (num6 < this.read) ? ((this.read - num6) - 1) : (this.end - num6);
}
if (num7 == 0)
{
this.write = num6;
r = this.inflate_flush(z, r);
num6 = this.write;
num7 = (num6 < this.read) ? ((this.read - num6) - 1) : (this.end - num6);
if ((num6 == this.end) && (this.read != 0))
{
num6 = 0;
num7 = (num6 < this.read) ? ((this.read - num6) - 1) : (this.end - num6);
}
if (num7 == 0)
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
}
}
r = 0;
num1 = this.left;
if (num1 > num5)
{
num1 = num5;
}
if (num1 > num7)
{
num1 = num7;
}
Array.Copy(z.next_in, num4, this.window, num6, num1);
num4 += num1;
num5 -= num1;
num6 += num1;
num7 -= num1;
this.left -= num1;
if (this.left == 0)
{
this.mode = (this.last != 0) ? 7 : 0;
}
goto Label_0047;
case 3:
while (num3 < 14)
{
if (num5 != 0)
{
r = 0;
}
else
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
num5--;
num2 |= (z.next_in[num4++] & 0xff) << (num3 & 0x1f);
num3 += 8;
}
this.table = num1 = num2 & 0x3fff;
if (((num1 & 0x1f) > 0x1d) || (((num1 >> 5) & 0x1f) > 0x1d))
{
this.mode = 9;
z.msg = "too many length or distance symbols";
r = -3;
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
num1 = (0x102 + (num1 & 0x1f)) + ((num1 >> 5) & 0x1f);
this.blens = new int[num1];
num2 = SupportClass.URShift(num2, 14);
num3 -= 14;
this.index = 0;
this.mode = 4;
goto Label_06E1;
case 4:
goto Label_06E1;
case 5:
goto Label_07B9;
case 6:
goto Label_0B63;
case 7:
goto Label_0C2C;
case 8:
goto Label_0CC1;
case 9:
r = -3;
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
default:
r = -2;
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
Label_06E1:
if (this.index < (4 + SupportClass.URShift(this.table, 10)))
{
while (num3 < 3)
{
if (num5 != 0)
{
r = 0;
}
else
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
num5--;
num2 |= (z.next_in[num4++] & 0xff) << (num3 & 0x1f);
num3 += 8;
}
this.blens[InfBlocks.border[this.index++]] = num2 & 7;
num2 = SupportClass.URShift(num2, 3);
num3 -= 3;
goto Label_06E1;
}
while (this.index < 0x13)
{
this.blens[InfBlocks.border[this.index++]] = 0;
}
this.bb[0] = 7;
num1 = InfTree.inflate_trees_bits(this.blens, this.bb, this.tb, this.hufts, z);
if (num1 != 0)
{
r = num1;
if (r == -3)
{
this.blens = null;
this.mode = 9;
}
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
this.index = 0;
this.mode = 5;
Label_07B9:
num1 = this.table;
if (this.index < ((0x102 + (num1 & 0x1f)) + ((num1 >> 5) & 0x1f)))
{
num1 = this.bb[0];
while (num3 < num1)
{
if (num5 != 0)
{
r = 0;
}
else
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
num5--;
num2 |= (z.next_in[num4++] & 0xff) << (num3 & 0x1f);
num3 += 8;
}
int num17 = this.tb[0];
num1 = this.hufts[((this.tb[0] + (num2 & InfBlocks.inflate_mask[num1])) * 3) + 1];
int num10 = this.hufts[((this.tb[0] + (num2 & InfBlocks.inflate_mask[num1])) * 3) + 2];
if (num10 < 0x10)
{
num2 = SupportClass.URShift(num2, num1);
num3 -= num1;
this.blens[this.index++] = num10;
goto Label_07B9;
}
int num8 = (num10 == 0x12) ? 7 : (num10 - 14);
int num9 = (num10 == 0x12) ? 11 : 3;
while (num3 < (num1 + num8))
{
if (num5 != 0)
{
r = 0;
}
else
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
num5--;
num2 |= (z.next_in[num4++] & 0xff) << (num3 & 0x1f);
num3 += 8;
}
num2 = SupportClass.URShift(num2, num1);
num3 -= num1;
num9 += num2 & InfBlocks.inflate_mask[num8];
num2 = SupportClass.URShift(num2, num8);
num3 -= num8;
num8 = this.index;
num1 = this.table;
if (((num8 + num9) > ((0x102 + (num1 & 0x1f)) + ((num1 >> 5) & 0x1f))) || ((num10 == 0x10) && (num8 < 1)))
{
this.blens = null;
this.mode = 9;
z.msg = "invalid bit length repeat";
r = -3;
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
num10 = (num10 == 0x10) ? this.blens[num8 - 1] : 0;
do
{
this.blens[num8++] = num10;
}while (--num9 != 0);
this.index = num8;
goto Label_07B9;
}
this.tb[0] = -1;
int[] numArray3 = new int[1];
int[] numArray4 = new int[1];
int[] numArray5 = new int[1];
int[] numArray6 = new int[1];
numArray3[0] = 9;
numArray4[0] = 6;
num1 = this.table;
num1 = InfTree.inflate_trees_dynamic(0x101 + (num1 & 0x1f), 1 + ((num1 >> 5) & 0x1f), this.blens, numArray3, numArray4, numArray5, numArray6, this.hufts, z);
switch (num1)
{
case 0:
this.codes = new InfCodes(numArray3[0], numArray4[0], this.hufts, numArray5[0], this.hufts, numArray6[0], z);
this.blens = null;
this.mode = 6;
goto Label_0B63;
case -3:
this.blens = null;
this.mode = 9;
break;
}
r = num1;
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
Label_0B63:
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
if ((r = this.codes.proc(this, z, r)) != 1)
{
return(this.inflate_flush(z, r));
}
r = 0;
this.codes.free(z);
num4 = z.next_in_index;
num5 = z.avail_in;
num2 = this.bitb;
num3 = this.bitk;
num6 = this.write;
num7 = (num6 < this.read) ? ((this.read - num6) - 1) : (this.end - num6);
if (this.last == 0)
{
this.mode = 0;
goto Label_0047;
}
this.mode = 7;
Label_0C2C:
this.write = num6;
r = this.inflate_flush(z, r);
num6 = this.write;
num7 = (num6 < this.read) ? ((this.read - num6) - 1) : (this.end - num6);
if (this.read != this.write)
{
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
this.mode = 8;
Label_0CC1:
r = 1;
this.bitb = num2;
this.bitk = num3;
z.avail_in = num5;
z.total_in += num4 - z.next_in_index;
z.next_in_index = num4;
this.write = num6;
return(this.inflate_flush(z, r));
}
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(InfBlocks s, ZStream z, int 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.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));
}
}
}
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;
}
internal void free(ZStream z)
{
// ZFREE(z, c);
}
void ClearContext(bool @in, bool @out)
{
if (@in && inbound != null) { inbound.free(); inbound = null; }
if (@out && outbound != null) { outbound.free(); outbound = null; }
}
// 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)
{
// ZFREE(z, c);
}
internal int dtree_index; // distance tree
internal InfCodes(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, ZStream z)
{
mode = START;
lbits = (byte)bl;
dbits = (byte)bd;
ltree = tl;
ltree_index = tl_index;
dtree = td;
dtree_index = td_index;
}
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);
}
}
}
internal static int inflate_trees_bits(int[] c, int[] bb, int[] tb, int[] hp, ZStream z)
{
int[] hn = new int[1];
int[] v = new int[19];
int num = InfTree.huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);
if (num == -3)
{
z.msg = "oversubscribed dynamic bit lengths tree";
}
else
{
if (num == -5 || bb[0] == 0)
{
z.msg = "incomplete dynamic bit lengths tree";
num = -3;
}
}
return(num);
}
