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269 lines
10 KiB
PHP
269 lines
10 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Search_Lucene
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* @subpackage Index
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: DictionaryLoader.php 20096 2010-01-06 02:05:09Z bkarwin $
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*/
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/**
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* Dictionary loader
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*
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* It's a dummy class which is created to encapsulate non-good structured code.
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* Manual "method inlining" is performed to increase dictionary index loading operation
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* which is major bottelneck for search performance.
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*
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*
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* @category Zend
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* @package Zend_Search_Lucene
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* @subpackage Index
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Search_Lucene_Index_DictionaryLoader
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{
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/**
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* Dictionary index loader.
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*
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* It takes a string which is actually <segment_name>.tii index file data and
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* returns two arrays - term and tremInfo lists.
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*
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* See Zend_Search_Lucene_Index_SegmintInfo class for details
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*
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* @param string $data
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* @return array
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* @throws Zend_Search_Lucene_Exception
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*/
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public static function load($data)
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{
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$termDictionary = array();
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$termInfos = array();
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$pos = 0;
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// $tiVersion = $tiiFile->readInt();
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$tiVersion = ord($data[0]) << 24 | ord($data[1]) << 16 | ord($data[2]) << 8 | ord($data[3]);
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$pos += 4;
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if ($tiVersion != (int)0xFFFFFFFE /* pre-2.1 format */ &&
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$tiVersion != (int)0xFFFFFFFD /* 2.1+ format */) {
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require_once 'Zend/Search/Lucene/Exception.php';
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throw new Zend_Search_Lucene_Exception('Wrong TermInfoIndexFile file format');
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}
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// $indexTermCount = $tiiFile->readLong();
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if (PHP_INT_SIZE > 4) {
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$indexTermCount = ord($data[$pos]) << 56 |
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ord($data[$pos+1]) << 48 |
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ord($data[$pos+2]) << 40 |
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ord($data[$pos+3]) << 32 |
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ord($data[$pos+4]) << 24 |
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ord($data[$pos+5]) << 16 |
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ord($data[$pos+6]) << 8 |
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ord($data[$pos+7]);
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} else {
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if ((ord($data[$pos]) != 0) ||
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(ord($data[$pos+1]) != 0) ||
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(ord($data[$pos+2]) != 0) ||
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(ord($data[$pos+3]) != 0) ||
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((ord($data[$pos+4]) & 0x80) != 0)) {
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require_once 'Zend/Search/Lucene/Exception.php';
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throw new Zend_Search_Lucene_Exception('Largest supported segment size (for 32-bit mode) is 2Gb');
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}
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$indexTermCount = ord($data[$pos+4]) << 24 |
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ord($data[$pos+5]) << 16 |
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ord($data[$pos+6]) << 8 |
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ord($data[$pos+7]);
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}
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$pos += 8;
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// $tiiFile->readInt(); // IndexInterval
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$pos += 4;
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// $skipInterval = $tiiFile->readInt();
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$skipInterval = ord($data[$pos]) << 24 | ord($data[$pos+1]) << 16 | ord($data[$pos+2]) << 8 | ord($data[$pos+3]);
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$pos += 4;
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if ($indexTermCount < 1) {
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require_once 'Zend/Search/Lucene/Exception.php';
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throw new Zend_Search_Lucene_Exception('Wrong number of terms in a term dictionary index');
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}
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if ($tiVersion == (int)0xFFFFFFFD /* 2.1+ format */) {
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/* Skip MaxSkipLevels value */
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$pos += 4;
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}
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$prevTerm = '';
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$freqPointer = 0;
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$proxPointer = 0;
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$indexPointer = 0;
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for ($count = 0; $count < $indexTermCount; $count++) {
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//$termPrefixLength = $tiiFile->readVInt();
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$nbyte = ord($data[$pos++]);
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$termPrefixLength = $nbyte & 0x7F;
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for ($shift=7; ($nbyte & 0x80) != 0; $shift += 7) {
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$nbyte = ord($data[$pos++]);
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$termPrefixLength |= ($nbyte & 0x7F) << $shift;
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}
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// $termSuffix = $tiiFile->readString();
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$nbyte = ord($data[$pos++]);
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$len = $nbyte & 0x7F;
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for ($shift=7; ($nbyte & 0x80) != 0; $shift += 7) {
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$nbyte = ord($data[$pos++]);
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$len |= ($nbyte & 0x7F) << $shift;
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}
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if ($len == 0) {
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$termSuffix = '';
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} else {
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$termSuffix = substr($data, $pos, $len);
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$pos += $len;
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for ($count1 = 0; $count1 < $len; $count1++ ) {
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if (( ord($termSuffix[$count1]) & 0xC0 ) == 0xC0) {
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$addBytes = 1;
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if (ord($termSuffix[$count1]) & 0x20 ) {
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$addBytes++;
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// Never used for Java Lucene created index.
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// Java2 doesn't encode strings in four bytes
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if (ord($termSuffix[$count1]) & 0x10 ) {
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$addBytes++;
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}
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}
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$termSuffix .= substr($data, $pos, $addBytes);
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$pos += $addBytes;
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$len += $addBytes;
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// Check for null character. Java2 encodes null character
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// in two bytes.
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if (ord($termSuffix[$count1]) == 0xC0 &&
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ord($termSuffix[$count1+1]) == 0x80 ) {
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$termSuffix[$count1] = 0;
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$termSuffix = substr($termSuffix,0,$count1+1)
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. substr($termSuffix,$count1+2);
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}
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$count1 += $addBytes;
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}
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}
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}
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// $termValue = Zend_Search_Lucene_Index_Term::getPrefix($prevTerm, $termPrefixLength) . $termSuffix;
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$pb = 0; $pc = 0;
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while ($pb < strlen($prevTerm) && $pc < $termPrefixLength) {
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$charBytes = 1;
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if ((ord($prevTerm[$pb]) & 0xC0) == 0xC0) {
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$charBytes++;
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if (ord($prevTerm[$pb]) & 0x20 ) {
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$charBytes++;
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if (ord($prevTerm[$pb]) & 0x10 ) {
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$charBytes++;
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}
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}
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}
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if ($pb + $charBytes > strlen($data)) {
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// wrong character
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break;
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}
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$pc++;
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$pb += $charBytes;
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}
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$termValue = substr($prevTerm, 0, $pb) . $termSuffix;
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// $termFieldNum = $tiiFile->readVInt();
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$nbyte = ord($data[$pos++]);
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$termFieldNum = $nbyte & 0x7F;
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for ($shift=7; ($nbyte & 0x80) != 0; $shift += 7) {
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$nbyte = ord($data[$pos++]);
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$termFieldNum |= ($nbyte & 0x7F) << $shift;
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}
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// $docFreq = $tiiFile->readVInt();
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$nbyte = ord($data[$pos++]);
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$docFreq = $nbyte & 0x7F;
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for ($shift=7; ($nbyte & 0x80) != 0; $shift += 7) {
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$nbyte = ord($data[$pos++]);
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$docFreq |= ($nbyte & 0x7F) << $shift;
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}
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// $freqPointer += $tiiFile->readVInt();
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$nbyte = ord($data[$pos++]);
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$vint = $nbyte & 0x7F;
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for ($shift=7; ($nbyte & 0x80) != 0; $shift += 7) {
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$nbyte = ord($data[$pos++]);
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$vint |= ($nbyte & 0x7F) << $shift;
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}
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$freqPointer += $vint;
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// $proxPointer += $tiiFile->readVInt();
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$nbyte = ord($data[$pos++]);
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$vint = $nbyte & 0x7F;
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for ($shift=7; ($nbyte & 0x80) != 0; $shift += 7) {
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$nbyte = ord($data[$pos++]);
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$vint |= ($nbyte & 0x7F) << $shift;
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}
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$proxPointer += $vint;
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if( $docFreq >= $skipInterval ) {
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// $skipDelta = $tiiFile->readVInt();
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$nbyte = ord($data[$pos++]);
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$vint = $nbyte & 0x7F;
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for ($shift=7; ($nbyte & 0x80) != 0; $shift += 7) {
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$nbyte = ord($data[$pos++]);
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$vint |= ($nbyte & 0x7F) << $shift;
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}
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$skipDelta = $vint;
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} else {
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$skipDelta = 0;
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}
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// $indexPointer += $tiiFile->readVInt();
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$nbyte = ord($data[$pos++]);
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$vint = $nbyte & 0x7F;
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for ($shift=7; ($nbyte & 0x80) != 0; $shift += 7) {
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$nbyte = ord($data[$pos++]);
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$vint |= ($nbyte & 0x7F) << $shift;
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}
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$indexPointer += $vint;
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// $this->_termDictionary[] = new Zend_Search_Lucene_Index_Term($termValue, $termFieldNum);
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$termDictionary[] = array($termFieldNum, $termValue);
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$termInfos[] =
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// new Zend_Search_Lucene_Index_TermInfo($docFreq, $freqPointer, $proxPointer, $skipDelta, $indexPointer);
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array($docFreq, $freqPointer, $proxPointer, $skipDelta, $indexPointer);
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$prevTerm = $termValue;
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}
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// Check special index entry mark
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if ($termDictionary[0][0] != (int)0xFFFFFFFF) {
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require_once 'Zend/Search/Lucene/Exception.php';
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throw new Zend_Search_Lucene_Exception('Wrong TermInfoIndexFile file format');
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}
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if (PHP_INT_SIZE > 4) {
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// Treat 64-bit 0xFFFFFFFF as -1
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$termDictionary[0][0] = -1;
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}
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return array($termDictionary, $termInfos);
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}
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}
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