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128 lines
4.4 KiB
128 lines
4.4 KiB
#ifndef LPC_COMPRESSED_H1108569807_INCLUDE_GUARD_
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#define LPC_COMPRESSED_H1108569807_INCLUDE_GUARD_
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/* This file is part of indexlib.
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* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
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*
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* Indexlib is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation and available as file
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* GPL_V2 which is distributed along with indexlib.
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*
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* Indexlib is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of this program with any edition of
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* the TQt library by Trolltech AS, Norway (or with modified versions
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* of TQt that use the same license as TQt), and distribute linked
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* combinations including the two. You must obey the GNU General
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* Public License in all respects for all of the code used other than
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* TQt. If you modify this file, you may extend this exception to
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* your version of the file, but you are not obligated to do so. If
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* you do not wish to do so, delete this exception statement from
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* your version.
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*/
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#include <string>
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#include <vector>
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#include <memory>
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#include <iostream>
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#include "memvector.h"
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#include "manager.h"
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#include "mempool.h"
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#include "thing.h"
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#include "pointer.h"
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#include "format.h"
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void set_compression_manager( memory_manager* );
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memory_manager* get_comp_p();
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START_THING( compressed_page, thing<thing_manager<get_comp_p> > )
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public: // private:
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MEMBER( uint8_t, capacity, 0 )
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enum { header_size = 1 };
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MY_BASE( header_size )
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public:
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static void init( pointer<compressed_page> p ) {
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p->set_capacity( 4 );
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}
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void * data() { return my_base(); }
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const void * data() const { return my_base(); }
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void grow_to_size( const unsigned size ) {
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unsigned cur = ( 1 << capacity() ) - header_size;
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if ( size <= cur ) return;
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set_capacity( capacity() + 1 );
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grow_to_size( size );
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}
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void print( std::ostream& out ) {
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out << format( "\tsized %s\n" ) % ( 1 << capacity() );
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}
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END_THING( compressed_page )
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DO_POINTER_SPECS( compressed_page )
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struct compressed_page_traits {
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typedef compressed_page value_type;
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typedef compressed_pageptr pointer;
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static bool is_free( pointer p ) { return p->capacity() == 0; }
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static void mark_free( pointer p ) { p->set_capacity( 0 ); }
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static unsigned size_of( pointer p ) { return 1 << p->capacity(); }
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static unsigned type_offset() { return compressed_page::header_size; }
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static unsigned min_size() { return 16; } // zlib needs minimum 12 bytes
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static unsigned max_size() { return 1024 * 4; }
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static void set_manager( memory_manager* m ) { set_compression_manager( m ); }
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static void print( std::ostream& out, pointer p ) { out << '[' << p << "] compressed_page:\n"; p->print( out ); }
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};
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class compressed_file : public memory_manager {
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struct page;
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friend struct page;
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public:
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compressed_file( std::string );
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~compressed_file();
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const unsigned char* ronly_base( unsigned idx ) const;
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unsigned char* rw_base( unsigned idx ) const;
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unsigned size() const;
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void resize( unsigned );
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void print( std::ostream& ) const;
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static void remove( std::string base );
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private:
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void write_back();
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void zlibchecktrue( bool ) const;
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void zlibcheck( int err, int expected = 0 ) const;
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enum { page_bits = 12, page_bytes = 1 << page_bits, compress_buffer_size = page_bytes + 12 + page_bytes/50 };
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static unsigned pageidx( unsigned idx ) { return idx >> page_bits; }
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static unsigned inpageidx( unsigned idx ) { return idx & ( ( 1 << page_bits ) - 1 ); }
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struct page {
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explicit page( bool d = false ):
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dirty_( d ) {
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}
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compressed_pageptr origin_;
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bool dirty_;
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unsigned char data_[ compressed_file::page_bytes ];
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};
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mutable std::vector<page*> pages_;
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mutable memvector<uint32_t> auxdata_;
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memory_reference<uint32_t> compressed_data_for( unsigned idx ) const {
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return auxdata_[ idx + 1 ];
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}
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mempool<compressed_page_traits> data_;
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};
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#endif /* LPC_COMPRESSED_H1108569807_INCLUDE_GUARD_ */
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