public int EndDeflate()
{
if ( dstate == null )
throw new CompressionProcessException ( "No Deflate State!" );
dstate = null;
return ZlibConstants.Z_OK;
}
internal void gen_bitlen( DeflateManager s )
{
short [] tree = dyn_tree;
short [] stree = staticTree.treeCodes;
int [] extra = staticTree.extraBits;
int base_Renamed = staticTree.extraBase;
int max_length = staticTree.maxLength;
int h;
int n, m;
int bits;
int xbits;
short f;
int overflow = 0;
for ( bits = 0; bits <= ZlibConstants.MAX_BITS; bits++ )
s.bl_count [ bits ] = 0;
tree [ s.heap [ s.heap_max ] * 2 + 1 ] = 0;
for ( h = s.heap_max + 1; h < HEAP_SIZE; h++ )
{
n = s.heap [ h ];
bits = tree [ tree [ n * 2 + 1 ] * 2 + 1 ] + 1;
if ( bits > max_length )
{
bits = max_length; overflow++;
}
tree [ n * 2 + 1 ] = ( short ) bits;
if ( n > max_code )
continue;
s.bl_count [ bits ]++;
xbits = 0;
if ( n >= base_Renamed )
xbits = extra [ n - base_Renamed ];
f = tree [ n * 2 ];
s.opt_len += f * ( bits + xbits );
if ( stree != null )
s.static_len += f * ( stree [ n * 2 + 1 ] + xbits );
}
if ( overflow == 0 )
return;
do
{
bits = max_length - 1;
while ( s.bl_count [ bits ] == 0 )
bits--;
s.bl_count [ bits ]--;
s.bl_count [ bits + 1 ] = ( short ) ( s.bl_count [ bits + 1 ] + 2 );
s.bl_count [ max_length ]--;
overflow -= 2;
}
while ( overflow > 0 );
for ( bits = max_length; bits != 0; bits-- )
{
n = s.bl_count [ bits ];
while ( n != 0 )
{
m = s.heap [ --h ];
if ( m > max_code )
continue;
if ( tree [ m * 2 + 1 ] != bits )
{
s.opt_len = ( int ) ( s.opt_len + ( ( long ) bits - ( long ) tree [ m * 2 + 1 ] ) * ( long ) tree [ m * 2 ] );
tree [ m * 2 + 1 ] = ( short ) bits;
}
n--;
}
}
}
internal void build_tree( DeflateManager s )
{
short [] tree = dyn_tree;
short [] stree = staticTree.treeCodes;
int elems = staticTree.elems;
int n, m;
int max_code = -1;
int node;
s.heap_len = 0;
s.heap_max = HEAP_SIZE;
for ( n = 0; n < elems; n++ )
{
if ( tree [ n * 2 ] != 0 )
{
s.heap [ ++s.heap_len ] = max_code = n;
s.depth [ n ] = 0;
}
else
{
tree [ n * 2 + 1 ] = 0;
}
}
while ( s.heap_len < 2 )
{
node = s.heap [ ++s.heap_len ] = ( max_code < 2 ? ++max_code : 0 );
tree [ node * 2 ] = 1;
s.depth [ node ] = 0;
s.opt_len--;
if ( stree != null )
s.static_len -= stree [ node * 2 + 1 ];
}
this.max_code = max_code;
for ( n = s.heap_len / 2; n >= 1; n-- )
s.pqdownheap ( tree, n );
node = elems;
do
{
n = s.heap [ 1 ];
s.heap [ 1 ] = s.heap [ s.heap_len-- ];
s.pqdownheap ( tree, 1 );
m = s.heap [ 1 ];
s.heap [ --s.heap_max ] = n;
s.heap [ --s.heap_max ] = m;
tree [ node * 2 ] = unchecked ( ( short ) ( tree [ n * 2 ] + tree [ m * 2 ] ) );
s.depth [ node ] = ( sbyte ) ( System.Math.Max ( ( byte ) s.depth [ n ], ( byte ) s.depth [ m ] ) + 1 );
tree [ n * 2 + 1 ] = tree [ m * 2 + 1 ] = ( short ) node;
s.heap [ 1 ] = node++;
s.pqdownheap ( tree, 1 );
}
while ( s.heap_len >= 2 );
s.heap [ --s.heap_max ] = s.heap [ 1 ];
gen_bitlen ( s );
gen_codes ( tree, max_code, s.bl_count );
}
private int _InternalInitializeDeflate( bool wantRfc1950Header )
{
if ( istate != null ) throw new CompressionProcessException ( "You may not call InitializeDeflate() after calling InitializeInflate()." );
dstate = new DeflateManager ();
dstate.WantRfc1950HeaderBytes = wantRfc1950Header;
return dstate.Initialize ( this, this.CompressLevel, this.WindowBits, this.Strategy );
}
