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/* This file is part of indexlib.
* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
*
* Indexlib is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation and available as file
* GPL_V2 which is distributed along with indexlib.
*
* Indexlib is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of this program with any edition of
* the TQt library by Trolltech AS, Norway (or with modified versions
* of TQt that use the same license as TQt), and distribute linked
* combinations including the two. You must obey the GNU General
* Public License in all respects for all of the code used other than
* TQt. If you modify this file, you may extend this exception to
* your version of the file, but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from
* your version.
*/
#include "compressed.h"
#include "logfile.h"
#include "bitio.h"
#include "path.h"
#include "format.h"
#include <zlib.h>
#include <cassert>
#include <cstring>
#include <iostream>
namespace {
memory_manager* cmanager = 0;
}
void set_compression_manager( memory_manager* m ) {
cmanager = m;
}
memory_manager* get_comp_p() {
return cmanager;
}
compressed_file::compressed_file( std::string base ):
auxdata_( path_concat( base, "table" ) ),
data_( std::auto_ptr<memory_manager>( new mmap_manager( path_concat( base, "data" ) ) ) )
{
if ( auxdata_.empty() ) auxdata_.push_back( 0 );
}
compressed_file::~compressed_file() {
write_back();
}
const unsigned char* compressed_file::ronly_base( const unsigned idx ) const {
logfile() << format( "%s ( addr: %s ) page: %s \n" ) % __PRETTY_FUNCTION__ % idx % pageidx( idx );
assert( idx < size() );
if ( pages_.size() <= pageidx( idx ) ) pages_.resize( pageidx( idx ) + 1 );
if ( !pages_[ pageidx( idx ) ] ) {
logfile() << format( "%s allocating a page %s\n" ) % __PRETTY_FUNCTION__ % pageidx( idx );
page* p = new page( true );
pages_[ pageidx( idx ) ] = p;
z_stream stream;
stream.zalloc = 0;
stream.zfree = 0;
stream.opaque = 0;
zlibcheck( inflateInit( &stream ) );
p->origin_ = compressed_pageptr::cast_from_uint32( compressed_data_for( pageidx( idx ) ) );
unsigned char* source = reinterpret_cast<unsigned char*>( p->origin_->data() );
stream.next_in = source;
stream.avail_in = ( 1 << p->origin_->capacity() ) - compressed_page::header_size;
stream.next_out = p->data_;
stream.avail_out = page_bytes + 1;
zlibcheck( inflate( &stream, Z_FINISH ), Z_STREAM_END );
//assert( !stream.avail_out );
zlibcheck( inflateEnd( &stream ) );
}
return & ( pages_[ pageidx( idx ) ]->data_[ inpageidx( idx ) ] );
}
void compressed_file::print( std::ostream& out ) const {
data_.print( out );
}
void compressed_file::remove( std::string base ) {
memvector<uint32_t>::remove( path_concat( base, "table" ) );
mmap_manager::remove( path_concat( base, "data" ) );
}
unsigned compressed_file::size() const {
return auxdata_[ 0 ];
}
void compressed_file::resize( const unsigned n_s ) {
logfile() << format( "%s ( %s )\n" ) % __PRETTY_FUNCTION__ % n_s;
if ( n_s <= size() ) return;
unsigned curpages = size() >> page_bits;
assert( !( size() % page_bytes ) );
const unsigned targetpages = ( n_s >> page_bits ) + bool( n_s % page_bytes );
auxdata_[ 0 ] = targetpages << page_bits;
logfile() << format( "Size set to %s (pages = %s, n_s = %s ) \n" ) % size() % targetpages % n_s;
auxdata_.resize( targetpages + 1 ); // 1 for the auxdata_[0]
static unsigned char empty[ page_bytes ] = { 0 };
unsigned char empty_compress[ compress_buffer_size ];
uLongf size = compress_buffer_size;
zlibcheck( compress( empty_compress, &size, empty, page_bytes ) );
while ( curpages < targetpages ) {
compressed_pageptr p = data_.allocate( size + compressed_page::header_size );
compressed_page::init( p );
p->grow_to_size( size );
std::memcpy( p->data(), empty_compress, size );
compressed_data_for ( curpages ) = p.cast_to_uint32();
++curpages;
}
}
unsigned char* compressed_file::rw_base( unsigned idx ) const {
const unsigned char* res = ronly_base( idx );
pages_[ pageidx( idx ) ]->dirty_ = true;
logfile() << format( "rw_base( %s ), pageidx=%s returning %s\n" ) % idx % pageidx( idx ) % ( void* )res;
return const_cast<unsigned char*>( res );
}
void compressed_file::write_back() {
logfile() <<format( "%s\n" ) % __PRETTY_FUNCTION__;
for ( unsigned pagei = 0, size = pages_.size(); pagei != size; ++ pagei ) {
page* p = pages_[ pagei ];
if ( p && p->dirty_ ) {
unsigned char buffer[ compress_buffer_size ];
uLongf size = compress_buffer_size;
zlibcheck( compress( buffer, &size, p->data_, page_bytes ) );
{
unsigned char buffer2[ 4096 ] = {0};
z_stream stream;
stream.zalloc = 0;
stream.zfree = 0;
stream.opaque = 0;
zlibcheck( inflateInit( &stream ) );
stream.next_in = buffer;
stream.avail_in = size;
stream.next_out = buffer2;
stream.avail_out = page_bytes + 1;
zlibcheck( inflate( &stream, Z_FINISH ), Z_STREAM_END );
//assert( !stream.avail_out );
zlibcheck( inflateEnd( &stream ) );
assert( !memcmp( buffer2, p->data_, 4096 ) );
}
logfile() << format( "Compressed page %s to size %s\n" ) % pagei % size;
unsigned original = ( 1 << p->origin_->capacity() ) - compressed_page::header_size;
if ( size > original ) {
p->origin_ = data_.reallocate( p->origin_, size + compressed_page::header_size );
p->origin_->grow_to_size( size );
}
std::memcpy( p->origin_->data(), buffer, size );
compressed_data_for( pagei ) = p->origin_.cast_to_uint32();
} else {
logfile() << format( "write_back() not saving %s\n" ) % pagei;
}
}
}
void compressed_file::zlibcheck( int err, int expected ) const {
if ( err != expected ) {
std::cerr << "zlib reports an error: " << err << std::endl;
// throw compressed_file::zlib_exception( err );
abort();
}
}
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