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;
}
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;
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;
}
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 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 InflateBlocks( ZlibCodec codec, System.Object checkfn, int w )
{
_codec = codec;
hufts = new int [ MANY * 3 ];
window = new byte [ w ];
end = w;
this.checkfn = checkfn;
mode = InflateBlockMode.TYPE;
Reset ();
}
internal int SyncPoint( ZlibCodec z )
{
return blocks.SyncPoint ();
}
internal int Initialize( ZlibCodec codec, int w )
{
_codec = codec;
_codec.Message = null;
blocks = null;
if ( w < 8 || w > 15 )
{
End ();
throw new CompressionProcessException ( "Bad window size." );
}
wbits = w;
blocks = new InflateBlocks ( codec,
HandleRfc1950HeaderBytes ? this : null,
1 << w );
Reset ();
return ZlibConstants.Z_OK;
}
internal int InflateFast( int bl, int bd, int [] tl, int tl_index, int [] td, int td_index, InflateBlocks s, ZlibCodec z )
{
int t;
int [] tp;
int tp_index;
int e;
int b;
int k;
int p;
int n;
int q;
int m;
int ml;
int md;
int c;
int d;
int r;
int tp_index_t_3;
p = z.NextIn; n = z.AvailableBytesIn; b = s.bitb; k = s.bitk;
q = s.writeAt; m = q < s.readAt ? s.readAt - q - 1 : s.end - q;
ml = InternalInflateConstants.InflateMask [ bl ];
md = InternalInflateConstants.InflateMask [ bd ];
do
{
while ( k < ( 20 ) )
{
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 & InternalInflateConstants.InflateMask [ e ] );
b >>= e; k -= e;
while ( k < 15 )
{
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 )
{
e &= 15;
while ( k < e )
{
n--;
b |= ( z.InputBuffer [ p++ ] & 0xff ) << k; k += 8;
}
d = tp [ tp_index_t_3 + 2 ] + ( b & InternalInflateConstants.InflateMask [ e ] );
b >>= e; k -= e;
m -= c;
if ( q >= d )
{
r = q - d;
if ( q - r > 0 && 2 > ( q - r ) )
{
s.window [ q++ ] = s.window [ r++ ];
s.window [ q++ ] = s.window [ r++ ];
c -= 2;
}
else
{
Array.Copy ( s.window, r, s.window, q, 2 );
q += 2; r += 2; c -= 2;
}
}
else
{
r = q - d;
do
{
r += s.end;
}
while ( r < 0 );
e = s.end - r;
if ( c > e )
{
c -= e;
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;
}
}
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 & InternalInflateConstants.InflateMask [ 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.writeAt = q;
return ZlibConstants.Z_DATA_ERROR;
}
}
while ( true );
break;
}
if ( ( e & 64 ) == 0 )
{
t += tp [ tp_index_t_3 + 2 ];
t += ( b & InternalInflateConstants.InflateMask [ 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.writeAt = 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.writeAt = q;
return ZlibConstants.Z_DATA_ERROR;
}
}
while ( true );
}
while ( m >= 258 && n >= 10 );
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.writeAt = q;
return ZlibConstants.Z_OK;
}
private void end()
{
if ( z == null )
return;
if ( _wantCompress )
{
_z.EndDeflate ();
}
else
{
_z.EndInflate ();
}
_z = null;
}
internal int Initialize( ZlibCodec codec, CompressionLevel level, int windowBits, int memLevel, CompressionStrategy strategy )
{
_codec = codec;
_codec.Message = null;
if ( windowBits < 9 || windowBits > 15 )
throw new CompressionProcessException ( "windowBits must be in the range 9..15." );
if ( memLevel < 1 || memLevel > MEM_LEVEL_MAX )
throw new CompressionProcessException ( String.Format ( "memLevel must be in the range 1.. {0}", MEM_LEVEL_MAX ) );
_codec.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 );
pending = new byte [ lit_bufsize * 4 ];
_distanceOffset = lit_bufsize;
_lengthOffset = ( 1 + 2 ) * lit_bufsize;
this.compressionLevel = level;
this.compressionStrategy = strategy;
Reset ();
return ZlibConstants.Z_OK;
}
internal int Initialize( ZlibCodec codec, CompressionLevel level, int bits, CompressionStrategy compressionStrategy )
{
return Initialize ( codec, level, bits, MEM_LEVEL_DEFAULT, compressionStrategy );
}
internal int Initialize( ZlibCodec codec, CompressionLevel level )
{
return Initialize ( codec, level, ZlibConstants.WindowBitsMax );
}