void sort_run( indri::file::File& out, indri::file::File& in, size_t memory ) {
// read the data in
UINT64 length = in.size();
char* data = new char[length];
in.read( data, 0, length );
in.close();
qsort( data, length / 12, 12, sort_comparator );
out.write( data, 0, length );
delete[] data;
}
void copy_region( indri::file::File& out, indri::file::File& in, UINT64 position, UINT64 length ) {
char* buffer = new char[1024*1024];
UINT64 bufLength = 1024*1024;
UINT64 total = 0;
while( length > total ) {
UINT64 chunk = lemur_compat::min<UINT64>( bufLength, length - total );
in.read( buffer, position + total, chunk );
out.write( buffer, total, chunk );
total += chunk;
}
delete[] buffer;
}
indri::index::DiskTermListFileIterator::DiskTermListFileIterator( indri::file::File& termListFile ) :
_termListFile(termListFile),
_buffer(_termListFile, 1024*1024),
_fileSize(termListFile.size()),
_finished(false),
_currentDocument(0)
{
}
indri::index::DiskDocListFileIterator::DiskDocListFileIterator( indri::file::File& docListFile, int fieldCount ) :
_file( new indri::file::SequentialReadBuffer( docListFile ) ),
_fileLength( docListFile.size() ),
_fieldCount( fieldCount ),
_iterator( _file, 0, 0 ),
_finished( false )
{
_termData = (indri::index::TermData*) malloc( ::termdata_size( fieldCount ) );
}
void sort_file( indri::file::File& out, indri::file::File& in, size_t memory, int totalDocuments ) {
UINT64 length = in.size();
size_t rounded = (memory / 12) * 12;
UINT64 total = 0;
std::vector<std::string> temporaries;
while( length > total ) {
UINT64 chunk = lemur_compat::min<UINT64>( rounded, length - total );
indri::file::File tempIn;
indri::file::File tempOut;
std::string nameIn;
std::string nameOut;
tempIn.openTemporary( nameIn );
tempOut.openTemporary( nameOut );
// make a sorted run
copy_region( tempIn, in, total, chunk );
sort_run( tempOut, tempIn, memory );
tempIn.close();
tempOut.close();
lemur_compat::remove( nameIn.c_str() );
temporaries.push_back( nameOut );
total += chunk;
}
in.close();
merge_sorted_runs( out, temporaries, totalDocuments );
for( size_t i=0; i<temporaries.size(); i++ ) {
lemur_compat::remove( temporaries[i].c_str() );
}
}
static void zlib_read_document( z_stream_s& stream, indri::file::File& infile, UINT64 offset, indri::utility::Buffer& outputBuffer ) {
// read in data from the file until the stream ends
// split up the data as necessary
// decompress positional info
// read some data
char inputBuffer[INPUT_BUFFER_SIZE];
outputBuffer.grow( INPUT_BUFFER_SIZE );
outputBuffer.write( sizeof(indri::api::ParsedDocument) );
stream.avail_in = 0;
stream.avail_out = 0;
while(true) {
if( !stream.avail_in ) {
UINT64 readSize = infile.read( inputBuffer, offset, sizeof inputBuffer );
offset += readSize;
stream.avail_in = readSize;
stream.next_in = (Bytef*) inputBuffer;
}
stream.avail_out = outputBuffer.size() - outputBuffer.position();
stream.next_out = (Bytef*) outputBuffer.write( outputBuffer.size() - outputBuffer.position() );
int result = inflate( &stream, Z_NO_FLUSH );
outputBuffer.unwrite( stream.avail_out );
if( result == Z_STREAM_END ) {
result = inflate( &stream, Z_FINISH );
if( result < 0 )
LEMUR_THROW( result, "Something bad happened while trying to finish decompressing a document." );
inflateEnd( &stream );
break;
}
if( result < 0 ) {
LEMUR_THROW( result, "Something bad happened while trying to decompress a document." );
}
if( stream.avail_out == 0 ) {
outputBuffer.grow();
}
}
}
void install_prior( const std::string& indexPath, const std::string& priorName, indri::file::File& priorFile ) {
std::string priorDirectory = indri::file::Path::combine( indexPath, "prior" );
std::string priorPath = indri::file::Path::combine( priorDirectory, priorName );
// make sure there's a prior directory in the index
if( indri::file::Path::exists( priorDirectory ) == false ) {
indri::file::Path::make( priorDirectory );
}
// if there's a old prior there with this name, remove it
if( indri::file::Path::exists( priorPath ) ) {
lemur_compat::remove( priorPath.c_str() );
}
// copy the file
indri::file::File output;
output.create( priorPath );
size_t length = priorFile.size();
copy_region( output, priorFile, 0, length );
output.close();
}
bool extract_compression_table( std::map<double, int>& values, indri::file::File& in ) {
indri::file::SequentialReadBuffer* inb = new indri::file::SequentialReadBuffer( in, 512*1024 );
MergeFile mf;
mf.file = ∈
mf.buffer = inb;
mf.length = in.size();
mf.score = 0;
inb->seek( sizeof(UINT32)*2 );
while( !mf.finished() && values.size() <= 256 ) {
mf.readScore();
std::map<double,int>::iterator iter = values.find( mf.score );
if( iter == values.end() ) {
values.insert( std::make_pair( mf.score, values.size() ) );
}
}
delete mf.buffer;
return values.size() <= 256;
}
void convert_intscore_to_long_binary( indri::file::File& outfile, const char* infile ) {
std::ifstream in;
in.open( infile );
indri::file::SequentialWriteBuffer* outb = new indri::file::SequentialWriteBuffer( outfile, 1024*1024 );
while( !in.eof() ) {
int document;
double score;
in >> document
>> score;
outb->write( (const void*) &document, sizeof(UINT32) );
outb->write( (const void*) &score, sizeof(double) );
}
outb->flush();
delete outb;
outfile.close();
in.close();
}