mirror of
https://github.com/xiaoyifang/goldendict-ng.git
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447 lines
12 KiB
C++
447 lines
12 KiB
C++
/* This file is (c) 2008-2011 Konstantin Isakov <ikm@goldendict.org>
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* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
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#include "dictdfiles.hh"
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#include "btreeidx.hh"
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#include "folding.hh"
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#include "utf8.hh"
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#include "dictzip.h"
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#include "htmlescape.hh"
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#include "fsencoding.hh"
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#include "langcoder.hh"
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#include <map>
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#include <set>
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#include <string>
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#include <vector>
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#include <list>
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#include <wctype.h>
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#include <stdlib.h>
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#ifdef _MSC_VER
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#include <stub_msvc.h>
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#endif
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namespace DictdFiles {
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using std::map;
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using std::multimap;
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using std::pair;
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using std::set;
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using std::string;
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using gd::wstring;
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using std::vector;
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using std::list;
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using BtreeIndexing::WordArticleLink;
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using BtreeIndexing::IndexedWords;
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using BtreeIndexing::IndexInfo;
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namespace {
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DEF_EX_STR( exCantReadFile, "Can't read file", Dictionary::Ex )
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DEF_EX( exFailedToReadLineFromIndex, "Failed to read line from index file", Dictionary::Ex )
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DEF_EX( exMalformedIndexFileLine, "Malformed index file line encountered", Dictionary::Ex )
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DEF_EX( exInvalidBase64, "Invalid base64 sequence encountered", Dictionary::Ex )
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enum
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{
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Signature = 0x58444344, // DCDX on little-endian, XDCD on big-endian
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CurrentFormatVersion = 3 + BtreeIndexing::FormatVersion + Folding::Version
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};
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struct IdxHeader
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{
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uint32_t signature; // First comes the signature, DCDX
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uint32_t formatVersion; // File format version (CurrentFormatVersion)
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uint32_t wordCount; // Total number of words
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uint32_t indexBtreeMaxElements; // Two fields from IndexInfo
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uint32_t indexRootOffset;
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uint32_t langFrom; // Source language
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uint32_t langTo; // Target language
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}
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#ifndef _MSC_VER
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__attribute__((packed))
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#endif
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;
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bool indexIsOldOrBad( string const & indexFile )
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{
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File::Class idx( indexFile, "rb" );
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IdxHeader header;
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return idx.readRecords( &header, sizeof( header ), 1 ) != 1 ||
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header.signature != Signature ||
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header.formatVersion != CurrentFormatVersion;
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}
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class DictdDictionary: public BtreeIndexing::BtreeDictionary
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{
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Mutex idxMutex;
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File::Class idx, indexFile; // The later is .index file
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IdxHeader idxHeader;
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dictData * dz;
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public:
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DictdDictionary( string const & id, string const & indexFile,
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vector< string > const & dictionaryFiles );
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~DictdDictionary();
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virtual string getName() throw();
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virtual map< Dictionary::Property, string > getProperties() throw()
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{ return map< Dictionary::Property, string >(); }
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virtual unsigned long getArticleCount() throw()
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{ return idxHeader.wordCount; }
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virtual unsigned long getWordCount() throw()
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{ return idxHeader.wordCount; }
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virtual QIcon getIcon() throw()
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{ return QIcon(":/icons/icon32_dictd.png"); }
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inline virtual quint32 getLangFrom() const
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{ return idxHeader.langFrom; }
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inline virtual quint32 getLangTo() const
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{ return idxHeader.langTo; }
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virtual sptr< Dictionary::DataRequest > getArticle( wstring const &,
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vector< wstring > const & alts,
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wstring const & )
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throw( std::exception );
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};
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DictdDictionary::DictdDictionary( string const & id,
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string const & indexFile,
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vector< string > const & dictionaryFiles ):
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BtreeDictionary( id, dictionaryFiles ),
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idx( indexFile, "rb" ),
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indexFile( dictionaryFiles[ 0 ], "rb" ),
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idxHeader( idx.read< IdxHeader >() )
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{
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// Open the .dict file
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dz = dict_data_open( dictionaryFiles[ 1 ].c_str(), 0 );
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if ( !dz )
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throw exCantReadFile( dictionaryFiles[ 1 ] );
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// Initialize the index
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openIndex( IndexInfo( idxHeader.indexBtreeMaxElements,
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idxHeader.indexRootOffset ),
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idx, idxMutex );
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}
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DictdDictionary::~DictdDictionary()
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{
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if ( dz )
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dict_data_close( dz );
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}
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string nameFromFileName( string const & indexFileName )
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{
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if ( indexFileName.empty() )
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return string();
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char const * sep = strrchr( indexFileName.c_str(), FsEncoding::separator() );
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if ( !sep )
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sep = indexFileName.c_str();
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char const * dot = strrchr( sep, '.' );
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if ( !dot )
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dot = indexFileName.c_str() + indexFileName.size();
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return Utf8::encode( FsEncoding::decode( string( sep + 1, dot - sep - 1 ) ) );
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}
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string DictdDictionary::getName() throw()
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{
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return nameFromFileName( getDictionaryFilenames()[ 0 ] );
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}
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uint32_t decodeBase64( string const & str )
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{
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static char const digits[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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uint32_t number = 0;
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for( char const * next = str.c_str(); *next; ++next )
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{
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char const * d = strchr( digits, *next );
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if ( !d )
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throw exInvalidBase64();
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number = number * 64 + ( d - digits );
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}
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return number;
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}
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sptr< Dictionary::DataRequest > DictdDictionary::getArticle( wstring const & word,
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vector< wstring > const & alts,
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wstring const & )
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throw( std::exception )
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{
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try
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{
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vector< WordArticleLink > chain = findArticles( word );
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for( unsigned x = 0; x < alts.size(); ++x )
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{
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/// Make an additional query for each alt
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vector< WordArticleLink > altChain = findArticles( alts[ x ] );
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chain.insert( chain.end(), altChain.begin(), altChain.end() );
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}
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multimap< wstring, string > mainArticles, alternateArticles;
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set< uint32_t > articlesIncluded; // Some synonyms make it that the articles
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// appear several times. We combat this
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// by only allowing them to appear once.
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wstring wordCaseFolded = Folding::applySimpleCaseOnly( word );
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char buf[ 16384 ];
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for( unsigned x = 0; x < chain.size(); ++x )
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{
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if ( articlesIncluded.find( chain[ x ].articleOffset ) != articlesIncluded.end() )
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continue; // We already have this article in the body.
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// Now load that article
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indexFile.seek( chain[ x ].articleOffset );
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if ( !indexFile.gets( buf, sizeof( buf ), true ) )
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throw exFailedToReadLineFromIndex();
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char * tab1 = strchr( buf, '\t' );
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if ( !tab1 )
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throw exMalformedIndexFileLine();
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char * tab2 = strchr( tab1 + 1, '\t' );
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if ( !tab2 )
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throw exMalformedIndexFileLine();
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// After tab1 should be article offset, after tab2 -- article size
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uint32_t articleOffset = decodeBase64( string( tab1 + 1, tab2 - tab1 - 1 ) );
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uint32_t articleSize = decodeBase64( tab2 + 1 );
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char * articleBody = dict_data_read_( dz, articleOffset, articleSize, 0, 0 );
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if ( !articleBody )
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throw exCantReadFile( getDictionaryFilenames()[ 1 ] );
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//sprintf( buf, "Offset: %u, Size: %u\n", articleOffset, articleSize );
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string articleText = string( "<div class=\"dictd_article\">" ) +
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Html::preformat( articleBody ) + "</div>";
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free( articleBody );
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// Ok. Now, does it go to main articles, or to alternate ones? We list
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// main ones first, and alternates after.
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// We do the case-folded comparison here.
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wstring headwordStripped =
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Folding::applySimpleCaseOnly( Utf8::decode( chain[ x ].word ) );
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multimap< wstring, string > & mapToUse =
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( wordCaseFolded == headwordStripped ) ?
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mainArticles : alternateArticles;
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mapToUse.insert( pair< wstring, string >(
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Folding::applySimpleCaseOnly( Utf8::decode( chain[ x ].word ) ),
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articleText ) );
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articlesIncluded.insert( chain[ x ].articleOffset );
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}
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if ( mainArticles.empty() && alternateArticles.empty() )
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return new Dictionary::DataRequestInstant( false );
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string result;
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multimap< wstring, string >::const_iterator i;
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for( i = mainArticles.begin(); i != mainArticles.end(); ++i )
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result += i->second;
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for( i = alternateArticles.begin(); i != alternateArticles.end(); ++i )
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result += i->second;
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sptr< Dictionary::DataRequestInstant > ret =
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new Dictionary::DataRequestInstant( true );
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ret->getData().resize( result.size() );
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memcpy( &(ret->getData().front()), result.data(), result.size() );
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return ret;
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}
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catch( std::exception & e )
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{
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return new Dictionary::DataRequestInstant( QString( e.what() ) );
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}
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}
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} // anonymous namespace
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static bool tryPossibleName( string const & name, string & copyTo )
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{
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if ( File::exists( name ) )
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{
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copyTo = name;
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return true;
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}
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else
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return false;
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}
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vector< sptr< Dictionary::Class > > makeDictionaries(
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vector< string > const & fileNames,
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string const & indicesDir,
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Dictionary::Initializing & initializing )
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throw( std::exception )
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{
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vector< sptr< Dictionary::Class > > dictionaries;
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for( vector< string >::const_iterator i = fileNames.begin(); i != fileNames.end();
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++i )
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{
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// Only allow .index suffixes
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if ( i->size() < 6 ||
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strcasecmp( i->c_str() + ( i->size() - 6 ), ".index" ) != 0 )
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continue;
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try
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{
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vector< string > dictFiles( 1, *i );
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// Check if there is an 'abrv' file present
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string baseName( *i, 0, i->size() - 5 );
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dictFiles.push_back( string() );
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if ( !tryPossibleName( baseName + "dict", dictFiles[ 1 ] ) &&
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!tryPossibleName( baseName + "dict.dz", dictFiles[ 1 ] ) )
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{
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// No corresponding .dict file, skipping
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continue;
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}
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string dictId = Dictionary::makeDictionaryId( dictFiles );
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string indexFile = indicesDir + dictId;
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if ( Dictionary::needToRebuildIndex( dictFiles, indexFile ) ||
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indexIsOldOrBad( indexFile ) )
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{
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// Building the index
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initializing.indexingDictionary( nameFromFileName( dictFiles[ 0 ] ) );
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File::Class idx( indexFile, "wb" );
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IdxHeader idxHeader;
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memset( &idxHeader, 0, sizeof( idxHeader ) );
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// We write a dummy header first. At the end of the process the header
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// will be rewritten with the right values.
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idx.write( idxHeader );
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IndexedWords indexedWords;
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File::Class indexFile( dictFiles[ 0 ], "rb" );
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// Read words from index until none's left.
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char buf[ 16384 ];
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do
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{
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uint32_t curOffset = indexFile.tell();
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if ( !indexFile.gets( buf, sizeof( buf ), true ) )
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break;
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// Check that there are exactly two tabs in the record.
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char * tab = strchr( buf, '\t' );
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if ( !tab || ! ( tab = strchr( tab + 1, '\t' ) ) || strchr( tab + 1, '\t' ) )
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{
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printf( "Warning: incorrect amount of tabs in a line, skipping: %s\n", buf );
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continue;
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}
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indexedWords.addWord( Utf8::decode( string( buf, strchr( buf, '\t' ) - buf ) ), curOffset );
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++idxHeader.wordCount;
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} while( !indexFile.eof() );
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// Build index
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IndexInfo idxInfo = BtreeIndexing::buildIndex( indexedWords, idx );
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idxHeader.indexBtreeMaxElements = idxInfo.btreeMaxElements;
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idxHeader.indexRootOffset = idxInfo.rootOffset;
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// That concludes it. Update the header.
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idxHeader.signature = Signature;
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idxHeader.formatVersion = CurrentFormatVersion;
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// read languages
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QPair<quint32,quint32> langs =
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LangCoder::findIdsForFilename( QString::fromStdString( dictFiles[ 0 ] ) );
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// if no languages found, try dictionary's name
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if ( langs.first == 0 || langs.second == 0 )
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{
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langs =
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LangCoder::findIdsForFilename( QString::fromStdString( nameFromFileName( dictFiles[ 0 ] ) ) );
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}
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idxHeader.langFrom = langs.first;
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idxHeader.langTo = langs.second;
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idx.rewind();
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idx.write( &idxHeader, sizeof( idxHeader ) );
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}
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dictionaries.push_back( new DictdDictionary( dictId,
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indexFile,
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dictFiles ) );
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}
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catch( std::exception & e )
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{
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fprintf( stderr, "Dictd dictionary reading failed: %s, error: %s\n",
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i->c_str(), e.what() );
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}
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}
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return dictionaries;
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}
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}
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