internal int inflate_trees_bits(int[] c, int[] bb, int[] tb, int[] hp, ZlibCodec z)
{
int result;
initWorkArea(19);
hn[0] = 0;
result = huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);
if (result == Z_DATA_ERROR)
{
z.Message = "oversubscribed dynamic bit lengths tree";
}
else if (result == Z_BUF_ERROR || bb[0] == 0)
{
z.Message = "incomplete dynamic bit lengths tree";
result = Z_DATA_ERROR;
}
return result;
}
internal int End(ZlibCodec z)
{
if (blocks != null)
blocks.Free (z);
blocks = null;
// ZFREE(z, z->state);
return ZlibConstants.Z_OK;
}
internal int Process(ZlibCodec 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.NextIn;
n = z.AvailableBytesIn;
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 = ZlibConstants.Z_OK;
} else {
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
;
n--;
b |= (z.InputBuffer [p++] & 0xff) << k;
k += 8;
}
t = (int)(b & 7);
last = t & 1;
switch (SharedUtils.URShift (t, 1)) {
case 0: // stored
{
b = SharedUtils.URShift (b, (3));
k -= (3);
}
t = k & 7; // go to byte boundary
{
b = SharedUtils.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.Init (bl [0], bd [0], tl [0], 0, td [0], 0, z);
}
{
b = SharedUtils.URShift (b, (3));
k -= (3);
}
mode = CODES;
break;
case 2: // dynamic
{
b = SharedUtils.URShift (b, (3));
k -= (3);
}
mode = TABLE;
break;
case 3: // illegal
{
b = SharedUtils.URShift (b, (3));
k -= (3);
}
mode = BAD;
z.Message = "invalid block type";
r = ZlibConstants.Z_DATA_ERROR;
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
break;
case LENS:
while (k < (32)) {
if (n != 0) {
r = ZlibConstants.Z_OK;
} else {
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
;
n--;
b |= (z.InputBuffer [p++] & 0xff) << k;
k += 8;
}
if (((SharedUtils.URShift ((~b), 16)) & 0xffff) != (b & 0xffff)) {
mode = BAD;
z.Message = "invalid stored block lengths";
r = ZlibConstants.Z_DATA_ERROR;
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return 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.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return 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 = 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.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
}
}
r = ZlibConstants.Z_OK;
t = left;
if (t > n)
t = n;
if (t > m)
t = m;
Array.Copy (z.InputBuffer, 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 = ZlibConstants.Z_OK;
} else {
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
;
n--;
b |= (z.InputBuffer [p++] & 0xff) << k;
k += 8;
}
table = t = (b & 0x3fff);
if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29) {
mode = BAD;
z.Message = "too many length or distance symbols";
r = ZlibConstants.Z_DATA_ERROR;
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
if (blens == null || blens.Length < t) {
blens = new int[t];
} else {
for (int i = 0; i < t; i++) {
blens [i] = 0;
}
}
{
b = SharedUtils.URShift (b, (14));
k -= (14);
}
index = 0;
mode = BTREE;
goto case BTREE;
case BTREE:
while (index < 4 + (SharedUtils.URShift(table, 10))) {
while (k < (3)) {
if (n != 0) {
r = ZlibConstants.Z_OK;
} else {
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
;
n--;
b |= (z.InputBuffer [p++] & 0xff) << k;
k += 8;
}
blens [border [index++]] = b & 7;
{
b = SharedUtils.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 != ZlibConstants.Z_OK) {
r = t;
if (r == ZlibConstants.Z_DATA_ERROR) {
blens = null;
mode = BAD;
}
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return 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 = ZlibConstants.Z_OK;
} else {
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
;
n--;
b |= (z.InputBuffer [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 = SharedUtils.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 = ZlibConstants.Z_OK;
} else {
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
;
n--;
b |= (z.InputBuffer [p++] & 0xff) << k;
k += 8;
}
b = SharedUtils.URShift (b, (t));
k -= (t);
j += (b & inflate_mask [i]);
b = SharedUtils.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.Message = "invalid bit length repeat";
r = ZlibConstants.Z_DATA_ERROR;
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return 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[] { 9 }; // must be <= 9 for lookahead assumptions
int[] bd = new int[] { 6 }; // must be <= 9 for lookahead assumptions
int[] tl = new int[1];
int[] td = new int[1];
t = table;
t = inftree.inflate_trees_dynamic (257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f), blens, bl, bd, tl, td, hufts, z);
if (t != ZlibConstants.Z_OK) {
if (t == ZlibConstants.Z_DATA_ERROR) {
blens = null;
mode = BAD;
}
r = t;
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
codes.Init (bl [0], bd [0], hufts, tl [0], hufts, td [0], z);
}
mode = CODES;
goto case CODES;
case CODES:
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
if ((r = codes.Process (this, z, r)) != ZlibConstants.Z_STREAM_END) {
return Flush (z, r);
}
r = ZlibConstants.Z_OK;
p = z.NextIn;
n = z.AvailableBytesIn;
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 = Flush (z, r);
q = write;
m = (int)(q < read ? read - q - 1 : end - q);
if (read != write) {
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
mode = DONE;
goto case DONE;
case DONE:
r = ZlibConstants.Z_STREAM_END;
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
case BAD:
r = ZlibConstants.Z_DATA_ERROR;
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
default:
r = ZlibConstants.Z_STREAM_ERROR;
bitb = b;
bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
write = q;
return Flush (z, r);
}
}
}
internal int Deflate(ZlibCodec strm, int flush)
{
int old_flush;
if (flush > ZlibConstants.Z_FINISH || flush < 0) {
throw new ZlibException (String.Format ("Flush value is invalid. Should be 0 < x < {0}", ZlibConstants.Z_FINISH));
//return ZlibConstants.Z_STREAM_ERROR;
}
if (strm.OutputBuffer == null || (strm.InputBuffer == null && strm.AvailableBytesIn != 0) || (status == FINISH_STATE && flush != ZlibConstants.Z_FINISH)) {
strm.Message = z_errmsg [ZlibConstants.Z_NEED_DICT - (ZlibConstants.Z_STREAM_ERROR)];
throw new ZlibException (String.Format ("Something is fishy. [{0}]", strm.Message));
//return ZlibConstants.Z_STREAM_ERROR;
}
if (strm.AvailableBytesOut == 0) {
strm.Message = z_errmsg [ZlibConstants.Z_NEED_DICT - (ZlibConstants.Z_BUF_ERROR)];
throw new ZlibException ("OutputBuffer is full (AvailableBytesOut == 0)");
//return ZlibConstants.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 = (((int)compressionLevel - 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)(SharedUtils.URShift (strm._Adler32, 16)));
putShortMSB ((int)(strm._Adler32 & 0xffff));
}
strm._Adler32 = Adler.Adler32 (0, null, 0, 0);
}
// Flush as much pending output as possible
if (pendingCount != 0) {
strm.flush_pending ();
if (strm.AvailableBytesOut == 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 ZlibConstants.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.AvailableBytesIn == 0 && flush <= old_flush && flush != ZlibConstants.Z_FINISH) {
strm.Message = z_errmsg [ZlibConstants.Z_NEED_DICT - (ZlibConstants.Z_BUF_ERROR)];
throw new ZlibException ("AvailableBytesOut == 0 && flush<=old_flush && flush != ZlibConstants.Z_FINISH");
//return ZlibConstants.Z_BUF_ERROR;
}
// User must not provide more input after the first FINISH:
if (status == FINISH_STATE && strm.AvailableBytesIn != 0) {
strm.Message = z_errmsg [ZlibConstants.Z_NEED_DICT - (ZlibConstants.Z_BUF_ERROR)];
throw new ZlibException ("status == FINISH_STATE && strm.AvailableBytesIn != 0");
//return ZlibConstants.Z_BUF_ERROR;
}
// Start a new block or continue the current one.
if (strm.AvailableBytesIn != 0 || lookahead != 0 || (flush != ZlibConstants.Z_NO_FLUSH && status != FINISH_STATE)) {
int bstate = - 1;
switch (configTable [(int)compressionLevel].func) {
case STORED:
bstate = DeflateNone (flush);
break;
case FAST:
bstate = DeflateFast (flush);
break;
case SLOW:
bstate = DeflateSlow (flush);
break;
default:
break;
}
if (bstate == FinishStarted || bstate == FinishDone) {
status = FINISH_STATE;
}
if (bstate == NeedMore || bstate == FinishStarted) {
if (strm.AvailableBytesOut == 0) {
last_flush = - 1; // avoid BUF_ERROR next call, see above
}
return ZlibConstants.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 == ZlibConstants.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 == ZlibConstants.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.AvailableBytesOut == 0) {
last_flush = - 1; // avoid BUF_ERROR at next call, see above
return ZlibConstants.Z_OK;
}
}
}
if (flush != ZlibConstants.Z_FINISH)
return ZlibConstants.Z_OK;
if (!WantRfc1950HeaderBytes || Rfc1950BytesEmitted)
return ZlibConstants.Z_STREAM_END;
// Write the zlib trailer (adler32)
putShortMSB ((int)(SharedUtils.URShift (strm._Adler32, 16)));
putShortMSB ((int)(strm._Adler32 & 0xffff));
strm.flush_pending ();
// If avail_out is zero, the application will call deflate again
// to flush the rest.
Rfc1950BytesEmitted = true; // write the trailer only once!
return pendingCount != 0 ? ZlibConstants.Z_OK : ZlibConstants.Z_STREAM_END;
}
internal int Initialize(ZlibCodec strm, CompressionLevel level)
{
return Initialize (strm, level, ZlibConstants.WINDOW_BITS_MAX);
}
private void end()
{
if (_z == null)
return;
if (_wantCompress)
{
_z.EndDeflate();
}
else
{
_z.EndInflate();
}
_z = null;
}
internal int SetDictionary(ZlibCodec strm, byte[] dictionary)
{
int length = dictionary.Length;
int index = 0;
if (dictionary == null || status != INIT_STATE)
throw new ZlibException ("Stream error.");
strm._Adler32 = Adler.Adler32 (strm._Adler32, dictionary, 0, dictionary.Length);
if (length < MIN_MATCH)
return ZlibConstants.Z_OK;
if (length > w_size - MIN_LOOKAHEAD) {
length = w_size - MIN_LOOKAHEAD;
index = dictionary.Length - 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 ZlibConstants.Z_OK;
}
internal int Reset(ZlibCodec z)
{
if (z == null)
throw new ZlibException ("Codec is null.");
if (z.istate == null)
throw new ZlibException ("InflateManager is null.");
z.TotalBytesIn = z.TotalBytesOut = 0;
z.Message = null;
z.istate.mode = z.istate.HandleRfc1950HeaderBytes ? METHOD : BLOCKS;
z.istate.blocks.Reset (z, null);
return ZlibConstants.Z_OK;
}
internal int SetDictionary(ZlibCodec z, byte[] dictionary)
{
int index = 0;
int length = dictionary.Length;
if (z == null || z.istate == null || z.istate.mode != DICT0)
throw new ZlibException ("Stream error.");
if (Adler.Adler32 (1L, dictionary, 0, dictionary.Length) != z._Adler32) {
return ZlibConstants.Z_DATA_ERROR;
}
z._Adler32 = Adler.Adler32 (0, null, 0, 0);
if (length >= (1 << z.istate.wbits)) {
length = (1 << z.istate.wbits) - 1;
index = dictionary.Length - length;
}
z.istate.blocks.SetDictionary (dictionary, index, length);
z.istate.mode = BLOCKS;
return ZlibConstants.Z_OK;
}
internal int Process(InflateBlocks blocks, ZlibCodec z, int r)
{
int j; // temporary storage
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.NextIn;
n = z.AvailableBytesIn;
b = blocks.bitb;
k = blocks.bitk;
q = blocks.write;
m = q < blocks.read ? blocks.read - q - 1 : blocks.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) {
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
r = InflateFast (lbits, dbits, ltree, ltree_index, dtree, dtree_index, blocks, z);
p = z.NextIn;
n = z.AvailableBytesIn;
b = blocks.bitb;
k = blocks.bitk;
q = blocks.write;
m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
if (r != ZlibConstants.Z_OK) {
mode = (r == ZlibConstants.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 = ZlibConstants.Z_OK;
else {
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
}
n--;
b |= (z.InputBuffer [p++] & 0xff) << k;
k += 8;
}
tindex = (tree_index + (b & inflate_mask [j])) * 3;
b = SharedUtils.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.Message = "invalid literal/length code";
r = ZlibConstants.Z_DATA_ERROR;
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
case LENEXT: // i: getting length extra (have base)
j = get_Renamed;
while (k < (j)) {
if (n != 0)
r = ZlibConstants.Z_OK;
else {
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
}
n--;
b |= (z.InputBuffer [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 = ZlibConstants.Z_OK;
else {
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
}
n--;
b |= (z.InputBuffer [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.Message = "invalid distance code";
r = ZlibConstants.Z_DATA_ERROR;
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
case DISTEXT: // i: getting distance extra
j = get_Renamed;
while (k < (j)) {
if (n != 0)
r = ZlibConstants.Z_OK;
else {
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
}
n--;
b |= (z.InputBuffer [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 += blocks.end; // of "if" handles invalid distances
}
while (len != 0) {
if (m == 0) {
if (q == blocks.end && blocks.read != 0) {
q = 0;
m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
}
if (m == 0) {
blocks.write = q;
r = blocks.Flush (z, r);
q = blocks.write;
m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
if (q == blocks.end && blocks.read != 0) {
q = 0;
m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
}
if (m == 0) {
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
}
}
}
blocks.window [q++] = blocks.window [f++];
m--;
if (f == blocks.end)
f = 0;
len--;
}
mode = START;
break;
case LIT: // o: got literal, waiting for output space
if (m == 0) {
if (q == blocks.end && blocks.read != 0) {
q = 0;
m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
}
if (m == 0) {
blocks.write = q;
r = blocks.Flush (z, r);
q = blocks.write;
m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
if (q == blocks.end && blocks.read != 0) {
q = 0;
m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
}
if (m == 0) {
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
}
}
}
r = ZlibConstants.Z_OK;
blocks.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
}
blocks.write = q;
r = blocks.Flush (z, r);
q = blocks.write;
m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
if (blocks.read != blocks.write) {
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
}
mode = END;
goto case END;
case END:
r = ZlibConstants.Z_STREAM_END;
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
case BADCODE: // x: got error
r = ZlibConstants.Z_DATA_ERROR;
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
default:
r = ZlibConstants.Z_STREAM_ERROR;
blocks.bitb = b;
blocks.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
blocks.write = q;
return blocks.Flush (z, r);
}
}
}
internal int Initialize(ZlibCodec z, int w)
{
z.Message = null;
blocks = null;
// handle undocumented nowrap option (no zlib header or check)
//nowrap = 0;
//if (w < 0)
//{
// w = - w;
// nowrap = 1;
//}
// set window size
if (w < 8 || w > 15) {
End (z);
throw new ZlibException ("Bad window size.");
//return ZlibConstants.Z_STREAM_ERROR;
}
wbits = w;
z.istate.blocks = new InflateBlocks (z,
z.istate.HandleRfc1950HeaderBytes ? this : null,
1 << w);
// reset state
Reset (z);
return ZlibConstants.Z_OK;
}
internal void Init(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, ZlibCodec z)
{
mode = START;
lbits = (byte)bl;
dbits = (byte)bd;
ltree = tl;
ltree_index = tl_index;
dtree = td;
dtree_index = td_index;
tree = 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 InflateFast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InflateBlocks s, ZlibCodec 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
int tp_index_t_3; // (tp_index+t)*3
// load input, output, bit values
p = z.NextIn;
n = z.AvailableBytesIn;
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.InputBuffer [p++] & 0xff) << k;
k += 8;
}
t = b & ml;
tp = tl;
tp_index = tl_index;
tp_index_t_3 = (tp_index + t) * 3;
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.InputBuffer [p++] & 0xff) << k;
k += 8;
}
t = b & md;
tp = td;
tp_index = td_index;
tp_index_t_3 = (tp_index + t) * 3;
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.InputBuffer [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++]; // minimum count is three,
s.window [q++] = s.window [r++]; // so unroll loop a little
c -= 2;
} 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]);
tp_index_t_3 = (tp_index + t) * 3;
e = tp [tp_index_t_3];
} else {
z.Message = "invalid distance code";
c = z.AvailableBytesIn - n;
c = (k >> 3) < c ? k >> 3 : c;
n += c;
p -= c;
k -= (c << 3);
s.bitb = b;
s.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
s.write = q;
return ZlibConstants.Z_DATA_ERROR;
}
} while (true);
break;
}
if ((e & 64) == 0) {
t += tp [tp_index_t_3 + 2];
t += (b & inflate_mask [e]);
tp_index_t_3 = (tp_index + t) * 3;
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.AvailableBytesIn - n;
c = (k >> 3) < c ? k >> 3 : c;
n += c;
p -= c;
k -= (c << 3);
s.bitb = b;
s.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
s.write = q;
return ZlibConstants.Z_STREAM_END;
} else {
z.Message = "invalid literal/length code";
c = z.AvailableBytesIn - n;
c = (k >> 3) < c ? k >> 3 : c;
n += c;
p -= c;
k -= (c << 3);
s.bitb = b;
s.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
s.write = q;
return ZlibConstants.Z_DATA_ERROR;
}
} while (true);
} while (m >= 258 && n >= 10);
// not enough input or output--restore pointers and return
c = z.AvailableBytesIn - n;
c = (k >> 3) < c ? k >> 3 : c;
n += c;
p -= c;
k -= (c << 3);
s.bitb = b;
s.bitk = k;
z.AvailableBytesIn = n;
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
s.write = q;
return ZlibConstants.Z_OK;
}
internal int Inflate(ZlibCodec z, int f)
{
int r;
int b;
if (z == null)
throw new ZlibException ("Codec is null. ");
if (z.istate == null)
throw new ZlibException ("InflateManager is null. ");
if (z.InputBuffer == null)
throw new ZlibException ("InputBuffer is null. ");
//return ZlibConstants.Z_STREAM_ERROR;
f = (f == ZlibConstants.Z_FINISH)
? ZlibConstants.Z_BUF_ERROR
: ZlibConstants.Z_OK;
r = ZlibConstants.Z_BUF_ERROR;
while (true) {
switch (z.istate.mode) {
case METHOD:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
if (((z.istate.method = z.InputBuffer [z.NextIn++]) & 0xf) != Z_DEFLATED) {
z.istate.mode = BAD;
z.Message = String.Format ("unknown compression method (0x{0:X2})", z.istate.method);
z.istate.marker = 5; // can't try inflateSync
break;
}
if ((z.istate.method >> 4) + 8 > z.istate.wbits) {
z.istate.mode = BAD;
z.Message = String.Format ("invalid window size ({0})", (z.istate.method >> 4) + 8);
z.istate.marker = 5; // can't try inflateSync
break;
}
z.istate.mode = FLAG;
goto case FLAG;
case FLAG:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
b = (z.InputBuffer [z.NextIn++]) & 0xff;
if ((((z.istate.method << 8) + b) % 31) != 0) {
z.istate.mode = BAD;
z.Message = "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.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
z.istate.need = ((z.InputBuffer [z.NextIn++] & 0xff) << 24) & unchecked((int)0xff000000L);
z.istate.mode = DICT3;
goto case DICT3;
case DICT3:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
z.istate.need += (((z.InputBuffer [z.NextIn++] & 0xff) << 16) & 0xff0000L);
z.istate.mode = DICT2;
goto case DICT2;
case DICT2:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
z.istate.need += (((z.InputBuffer [z.NextIn++] & 0xff) << 8) & 0xff00L);
z.istate.mode = DICT1;
goto case DICT1;
case DICT1:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
z.istate.need += (z.InputBuffer [z.NextIn++] & 0xffL);
z._Adler32 = z.istate.need;
z.istate.mode = DICT0;
return ZlibConstants.Z_NEED_DICT;
case DICT0:
z.istate.mode = BAD;
z.Message = "need dictionary";
z.istate.marker = 0; // can try inflateSync
return ZlibConstants.Z_STREAM_ERROR;
case BLOCKS:
r = z.istate.blocks.Process (z, r);
if (r == ZlibConstants.Z_DATA_ERROR) {
z.istate.mode = BAD;
z.istate.marker = 0; // can try inflateSync
break;
}
if (r == ZlibConstants.Z_OK)
r = f;
if (r != ZlibConstants.Z_STREAM_END)
return r;
r = f;
z.istate.blocks.Reset (z, z.istate.was);
if (!z.istate.HandleRfc1950HeaderBytes) {
z.istate.mode = DONE;
break;
}
z.istate.mode = CHECK4;
goto case CHECK4;
case CHECK4:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
z.istate.need = ((z.InputBuffer [z.NextIn++] & 0xff) << 24) & unchecked((int)0xff000000L);
z.istate.mode = CHECK3;
goto case CHECK3;
case CHECK3:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
z.istate.need += (((z.InputBuffer [z.NextIn++] & 0xff) << 16) & 0xff0000L);
z.istate.mode = CHECK2;
goto case CHECK2;
case CHECK2:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
z.istate.need += (((z.InputBuffer [z.NextIn++] & 0xff) << 8) & 0xff00L);
z.istate.mode = CHECK1;
goto case CHECK1;
case CHECK1:
if (z.AvailableBytesIn == 0)
return r;
r = f;
z.AvailableBytesIn--;
z.TotalBytesIn++;
z.istate.need += (z.InputBuffer [z.NextIn++] & 0xffL);
unchecked {
if (((int)(z.istate.was [0])) != ((int)(z.istate.need))) {
z.istate.mode = BAD;
z.Message = "incorrect data check";
z.istate.marker = 5; // can't try inflateSync
break;
}
}
z.istate.mode = DONE;
goto case DONE;
case DONE:
return ZlibConstants.Z_STREAM_END;
case BAD:
throw new ZlibException (String.Format ("Bad state ({0})", z.Message));
//return ZlibConstants.Z_DATA_ERROR;
default:
throw new ZlibException ("Stream error.");
//return ZlibConstants.Z_STREAM_ERROR;
}
}
}
internal int inflate_trees_dynamic(int nl, int nd, int[] c, int[] bl, int[] bd, int[] tl, int[] td, int[] hp, ZlibCodec z)
{
int result;
// build literal/length tree
initWorkArea(288);
hn[0] = 0;
result = huft_build(c, 0, nl, 257, cplens, cplext, tl, bl, hp, hn, v);
if (result != Z_OK || bl[0] == 0)
{
if (result == Z_DATA_ERROR)
{
z.Message = "oversubscribed literal/length tree";
}
else if (result != Z_MEM_ERROR)
{
z.Message = "incomplete literal/length tree";
result = Z_DATA_ERROR;
}
return result;
}
// build distance tree
initWorkArea(288);
result = huft_build(c, nl, nd, 0, cpdist, cpdext, td, bd, hp, hn, v);
if (result != Z_OK || (bd[0] == 0 && nl > 257))
{
if (result == Z_DATA_ERROR)
{
z.Message = "oversubscribed distance tree";
}
else if (result == Z_BUF_ERROR)
{
z.Message = "incomplete distance tree";
result = Z_DATA_ERROR;
}
else if (result != Z_MEM_ERROR)
{
z.Message = "empty distance tree with lengths";
result = Z_DATA_ERROR;
}
return result;
}
return Z_OK;
}
internal int Sync(ZlibCodec z)
{
int n; // number of bytes to look at
int p; // pointer to bytes
int m; // number of marker bytes found in a row
long r, w; // temporaries to save total_in and total_out
// set up
if (z == null || z.istate == null)
return ZlibConstants.Z_STREAM_ERROR;
if (z.istate.mode != BAD) {
z.istate.mode = BAD;
z.istate.marker = 0;
}
if ((n = z.AvailableBytesIn) == 0)
return ZlibConstants.Z_BUF_ERROR;
p = z.NextIn;
m = z.istate.marker;
// search
while (n != 0 && m < 4) {
if (z.InputBuffer [p] == mark [m]) {
m++;
} else if (z.InputBuffer [p] != 0) {
m = 0;
} else {
m = 4 - m;
}
p++;
n--;
}
// restore
z.TotalBytesIn += p - z.NextIn;
z.NextIn = p;
z.AvailableBytesIn = n;
z.istate.marker = m;
// return no joy or set up to restart on a new block
if (m != 4) {
return ZlibConstants.Z_DATA_ERROR;
}
r = z.TotalBytesIn;
w = z.TotalBytesOut;
Reset (z);
z.TotalBytesIn = r;
z.TotalBytesOut = w;
z.istate.mode = BLOCKS;
return ZlibConstants.Z_OK;
}
internal static int inflate_trees_fixed(int[] bl, int[] bd, int[][] tl, int[][] td, ZlibCodec z)
{
bl[0] = fixed_bl;
bd[0] = fixed_bd;
tl[0] = fixed_tl;
td[0] = fixed_td;
return Z_OK;
}
// Returns true if inflate is currently at the end of a block generated
// by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
// implementation to provide an additional safety check. PPP uses Z_SYNC_FLUSH
// but removes the length bytes of the resulting empty stored block. When
// decompressing, PPP checks that at the end of input packet, inflate is
// waiting for these length bytes.
internal int SyncPoint(ZlibCodec z)
{
if (z == null || z.istate == null || z.istate.blocks == null)
return ZlibConstants.Z_STREAM_ERROR;
return z.istate.blocks.SyncPoint ();
}
internal int Reset(ZlibCodec strm)
{
strm.TotalBytesIn = strm.TotalBytesOut = 0;
strm.Message = null;
//strm.data_type = Z_UNKNOWN;
pendingCount = 0;
nextPending = 0;
Rfc1950BytesEmitted = false;
status = (WantRfc1950HeaderBytes) ? INIT_STATE : BUSY_STATE;
strm._Adler32 = Adler.Adler32 (0, null, 0, 0);
last_flush = ZlibConstants.Z_NO_FLUSH;
_InitializeTreeData ();
_InitializeLazyMatch ();
return ZlibConstants.Z_OK;
}
internal InflateBlocks(ZlibCodec 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 int SetParams(ZlibCodec strm, CompressionLevel _level, CompressionStrategy _strategy)
{
int result = ZlibConstants.Z_OK;
if (configTable [(int)compressionLevel].func != configTable [(int)_level].func && strm.TotalBytesIn != 0) {
// Flush the last buffer:
result = strm.Deflate (ZlibConstants.Z_PARTIAL_FLUSH);
}
if (compressionLevel != _level) {
compressionLevel = _level;
max_lazy_match = configTable [(int)compressionLevel].max_lazy;
good_match = configTable [(int)compressionLevel].good_length;
nice_match = configTable [(int)compressionLevel].nice_length;
max_chain_length = configTable [(int)compressionLevel].max_chain;
}
compressionStrategy = _strategy;
return result;
}
// copy as much as possible from the sliding window to the output area
internal int Flush(ZlibCodec z, int r)
{
int n;
int p;
int q;
// local copies of source and destination pointers
p = z.NextOut;
q = read;
// compute number of bytes to copy as far as end of window
n = (int)((q <= write ? write : end) - q);
if (n > z.AvailableBytesOut)
n = z.AvailableBytesOut;
if (n != 0 && r == ZlibConstants.Z_BUF_ERROR)
r = ZlibConstants.Z_OK;
// update counters
z.AvailableBytesOut -= n;
z.TotalBytesOut += n;
// update check information
if (checkfn != null)
z._Adler32 = check = Adler.Adler32 (check, window, q, n);
// copy as far as end of window
Array.Copy (window, q, z.OutputBuffer, 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.AvailableBytesOut)
n = z.AvailableBytesOut;
if (n != 0 && r == ZlibConstants.Z_BUF_ERROR)
r = ZlibConstants.Z_OK;
// update counters
z.AvailableBytesOut -= n;
z.TotalBytesOut += n;
// update check information
if (checkfn != null)
z._Adler32 = check = Adler.Adler32 (check, window, q, n);
// copy
Array.Copy (window, q, z.OutputBuffer, p, n);
p += n;
q += n;
}
// update pointers
z.NextOut = p;
read = q;
// done
return r;
}
internal int Initialize(ZlibCodec strm, CompressionLevel level, int bits)
{
return Initialize (strm, level, Z_DEFLATED, bits, MEM_LEVEL_DEFAULT, CompressionStrategy.DEFAULT);
}
internal void Free(ZlibCodec z)
{
Reset (z, null);
window = null;
hufts = null;
//ZFREE(z, s);
}
internal int Initialize(ZlibCodec stream, CompressionLevel level, int method, int windowBits, int memLevel, CompressionStrategy strategy)
{
stream.Message = null;
// validation
if (windowBits < 9 || windowBits > 15)
throw new ZlibException ("windowBits must be in the range 9..15.");
if (memLevel < 1 || memLevel > MEM_LEVEL_MAX)
throw new ZlibException (String.Format ("memLevel must be in the range 1.. {0}", MEM_LEVEL_MAX));
if (method != Z_DEFLATED)
throw new ZlibException ("Unexpected value for method: it must be Z_DEFLATED.");
stream.dstate = this;
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 = new byte[lit_bufsize * 4];
d_buf = lit_bufsize / 2;
l_buf = (1 + 2) * lit_bufsize;
this.compressionLevel = level;
this.compressionStrategy = strategy;
this.method = (sbyte)method;
return Reset (stream);
}
internal void Reset(ZlibCodec z, long[] c)
{
if (c != null)
c [0] = check;
if (mode == BTREE || mode == DTREE) {
}
if (mode == CODES) {
}
mode = TYPE;
bitk = 0;
bitb = 0;
read = write = 0;
if (checkfn != null)
z._Adler32 = check = Adler.Adler32 (0L, null, 0, 0);
}