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Code Editor : LZWDecode.php
<?php // // FPDI - Version 1.2 // // Copyright 2004-2007 Setasign - Jan Slabon // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // class LZWDecode { var $sTable = array(); var $data = null; var $tIdx; var $bitsToGet = 9; var $bytePointer; var $bitPointer; var $nextData = 0; var $nextBits = 0; var $andTable = array(511, 1023, 2047, 4095); function LZWDecode(&$fpdi) { $this->fpdi =& $fpdi; } /** * Method to decode LZW compressed data. * * @param string data The compressed data. */ function decode(&$data) { if($data[0] == 0x00 && $data[1] == 0x01) { $this->fpdi->error("LZW flavour not supported."); } $this->initsTable(); $this->data =& $data; // Initialize pointers $this->bytePointer = 0; $this->bitPointer = 0; $this->nextData = 0; $this->nextBits = 0; $oldCode = 0; $string = ""; $uncompData = ""; while (($code = $this->getNextCode()) != 257) { if ($code == 256) { $this->initsTable(); $code = $this->getNextCode(); if ($code == 257) { break; } $uncompData .= $this->sTable[$code]; $oldCode = $code; } else { if ($code < $this->tIdx) { $string = $this->sTable[$code]; $uncompData .= $string; $this->addStringToTable($this->sTable[$oldCode], $string[0]); $oldCode = $code; } else { $string = $this->sTable[$oldCode]; $string = $string.$string[0]; $uncompData .= $string; $this->addStringToTable($string); $oldCode = $code; } } } return $uncompData; } /** * Initialize the string table. */ function initsTable() { $this->sTable = array(); for ($i = 0; $i < 256; $i++) $this->sTable[$i] = chr($i); $this->tIdx = 258; $this->bitsToGet = 9; } /** * Add a new string to the string table. */ function addStringToTable ($oldString, $newString="") { $string = $oldString.$newString; // Add this new String to the table $this->sTable[$this->tIdx++] = $string; if ($this->tIdx == 511) { $this->bitsToGet = 10; } else if ($this->tIdx == 1023) { $this->bitsToGet = 11; } else if ($this->tIdx == 2047) { $this->bitsToGet = 12; } } // Returns the next 9, 10, 11 or 12 bits function getNextCode() { if ($this->bytePointer == strlen($this->data)) return 257; $this->nextData = ($this->nextData << 8) | (ord($this->data[$this->bytePointer++]) & 0xff); $this->nextBits += 8; if ($this->nextBits < $this->bitsToGet) { $this->nextData = ($this->nextData << 8) | (ord($this->data[$this->bytePointer++]) & 0xff); $this->nextBits += 8; } $code = ($this->nextData >> ($this->nextBits - $this->bitsToGet)) & $this->andTable[$this->bitsToGet-9]; $this->nextBits -= $this->bitsToGet; return $code; } } ?>
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