700 lines
16 KiB
PHP
700 lines
16 KiB
PHP
<?php
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// 2009-12-22 Adapted for mPDF 4.2
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// GIF Util - (C) 2003 Yamasoft (S/C)
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// http://www.yamasoft.com
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// All Rights Reserved
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// This file can be freely copied, distributed, modified, updated by anyone under the only
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// condition to leave the original address (Yamasoft, http://www.yamasoft.com) and this header.
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///////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// 2009-12-22 Adapted INB
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// Functions calling functionname($x, $len = 0) were not working on PHP5.1.5 as pass by reference
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// All edited to $len = 0; then call function.
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///////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class CGIFLZW
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{
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var $MAX_LZW_BITS;
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var $Fresh, $CodeSize, $SetCodeSize, $MaxCode, $MaxCodeSize, $FirstCode, $OldCode;
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var $ClearCode, $EndCode, $Next, $Vals, $Stack, $sp, $Buf, $CurBit, $LastBit, $Done, $LastByte;
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///////////////////////////////////////////////////////////////////////////
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// CONSTRUCTOR
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function CGIFLZW()
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{
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$this->MAX_LZW_BITS = 12;
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unSet($this->Next);
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unSet($this->Vals);
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unSet($this->Stack);
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unSet($this->Buf);
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$this->Next = range(0, (1 << $this->MAX_LZW_BITS) - 1);
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$this->Vals = range(0, (1 << $this->MAX_LZW_BITS) - 1);
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$this->Stack = range(0, (1 << ($this->MAX_LZW_BITS + 1)) - 1);
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$this->Buf = range(0, 279);
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}
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///////////////////////////////////////////////////////////////////////////
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function deCompress($data, &$datLen)
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{
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$stLen = strlen($data);
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$datLen = 0;
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$ret = "";
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$dp = 0; // data pointer
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// INITIALIZATION
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$this->LZWCommandInit($data, $dp);
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while(($iIndex = $this->LZWCommand($data, $dp)) >= 0) {
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$ret .= chr($iIndex);
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}
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$datLen = $dp;
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if($iIndex != -2) {
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return false;
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}
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return $ret;
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}
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///////////////////////////////////////////////////////////////////////////
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function LZWCommandInit(&$data, &$dp)
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{
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$this->SetCodeSize = ord($data[0]);
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$dp += 1;
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$this->CodeSize = $this->SetCodeSize + 1;
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$this->ClearCode = 1 << $this->SetCodeSize;
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$this->EndCode = $this->ClearCode + 1;
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$this->MaxCode = $this->ClearCode + 2;
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$this->MaxCodeSize = $this->ClearCode << 1;
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$this->GetCodeInit($data, $dp);
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$this->Fresh = 1;
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for($i = 0; $i < $this->ClearCode; $i++) {
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$this->Next[$i] = 0;
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$this->Vals[$i] = $i;
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}
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for(; $i < (1 << $this->MAX_LZW_BITS); $i++) {
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$this->Next[$i] = 0;
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$this->Vals[$i] = 0;
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}
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$this->sp = 0;
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return 1;
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}
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function LZWCommand(&$data, &$dp)
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{
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if($this->Fresh) {
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$this->Fresh = 0;
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do {
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$this->FirstCode = $this->GetCode($data, $dp);
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$this->OldCode = $this->FirstCode;
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}
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while($this->FirstCode == $this->ClearCode);
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return $this->FirstCode;
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}
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if($this->sp > 0) {
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$this->sp--;
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return $this->Stack[$this->sp];
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}
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while(($Code = $this->GetCode($data, $dp)) >= 0) {
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if($Code == $this->ClearCode) {
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for($i = 0; $i < $this->ClearCode; $i++) {
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$this->Next[$i] = 0;
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$this->Vals[$i] = $i;
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}
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for(; $i < (1 << $this->MAX_LZW_BITS); $i++) {
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$this->Next[$i] = 0;
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$this->Vals[$i] = 0;
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}
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$this->CodeSize = $this->SetCodeSize + 1;
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$this->MaxCodeSize = $this->ClearCode << 1;
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$this->MaxCode = $this->ClearCode + 2;
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$this->sp = 0;
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$this->FirstCode = $this->GetCode($data, $dp);
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$this->OldCode = $this->FirstCode;
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return $this->FirstCode;
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}
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if($Code == $this->EndCode) {
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return -2;
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}
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$InCode = $Code;
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if($Code >= $this->MaxCode) {
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$this->Stack[$this->sp++] = $this->FirstCode;
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$Code = $this->OldCode;
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}
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while($Code >= $this->ClearCode) {
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$this->Stack[$this->sp++] = $this->Vals[$Code];
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if($Code == $this->Next[$Code]) // Circular table entry, big GIF Error!
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return -1;
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$Code = $this->Next[$Code];
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}
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$this->FirstCode = $this->Vals[$Code];
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$this->Stack[$this->sp++] = $this->FirstCode;
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if(($Code = $this->MaxCode) < (1 << $this->MAX_LZW_BITS)) {
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$this->Next[$Code] = $this->OldCode;
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$this->Vals[$Code] = $this->FirstCode;
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$this->MaxCode++;
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if(($this->MaxCode >= $this->MaxCodeSize) && ($this->MaxCodeSize < (1 << $this->MAX_LZW_BITS))) {
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$this->MaxCodeSize *= 2;
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$this->CodeSize++;
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}
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}
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$this->OldCode = $InCode;
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if($this->sp > 0) {
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$this->sp--;
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return $this->Stack[$this->sp];
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}
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}
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return $Code;
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}
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///////////////////////////////////////////////////////////////////////////
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function GetCodeInit(&$data, &$dp)
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{
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$this->CurBit = 0;
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$this->LastBit = 0;
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$this->Done = 0;
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$this->LastByte = 2;
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return 1;
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}
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function GetCode(&$data, &$dp)
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{
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if(($this->CurBit + $this->CodeSize) >= $this->LastBit) {
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if($this->Done) {
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if($this->CurBit >= $this->LastBit) {
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// Ran off the end of my bits
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return 0;
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}
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return -1;
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}
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$this->Buf[0] = $this->Buf[$this->LastByte - 2];
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$this->Buf[1] = $this->Buf[$this->LastByte - 1];
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$Count = ord($data[$dp]);
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$dp += 1;
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if($Count) {
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for($i = 0; $i < $Count; $i++) {
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$this->Buf[2 + $i] = ord($data[$dp+$i]);
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}
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$dp += $Count;
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}
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else {
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$this->Done = 1;
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}
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$this->LastByte = 2 + $Count;
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$this->CurBit = ($this->CurBit - $this->LastBit) + 16;
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$this->LastBit = (2 + $Count) << 3;
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}
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$iRet = 0;
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for($i = $this->CurBit, $j = 0; $j < $this->CodeSize; $i++, $j++) {
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$iRet |= (($this->Buf[intval($i / 8)] & (1 << ($i % 8))) != 0) << $j;
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}
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$this->CurBit += $this->CodeSize;
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return $iRet;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class CGIFCOLORTABLE
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{
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var $m_nColors;
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var $m_arColors;
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///////////////////////////////////////////////////////////////////////////
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// CONSTRUCTOR
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function CGIFCOLORTABLE()
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{
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unSet($this->m_nColors);
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unSet($this->m_arColors);
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}
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///////////////////////////////////////////////////////////////////////////
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function load($lpData, $num)
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{
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$this->m_nColors = 0;
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$this->m_arColors = array();
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for($i = 0; $i < $num; $i++) {
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$rgb = substr($lpData, $i * 3, 3);
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if(strlen($rgb) < 3) {
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return false;
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}
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$this->m_arColors[] = (ord($rgb[2]) << 16) + (ord($rgb[1]) << 8) + ord($rgb[0]);
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$this->m_nColors++;
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}
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return true;
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}
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///////////////////////////////////////////////////////////////////////////
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function toString()
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{
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$ret = "";
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for($i = 0; $i < $this->m_nColors; $i++) {
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$ret .=
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chr(($this->m_arColors[$i] & 0x000000FF)) . // R
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chr(($this->m_arColors[$i] & 0x0000FF00) >> 8) . // G
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chr(($this->m_arColors[$i] & 0x00FF0000) >> 16); // B
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}
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return $ret;
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}
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///////////////////////////////////////////////////////////////////////////
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function colorIndex($rgb)
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{
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$rgb = intval($rgb) & 0xFFFFFF;
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$r1 = ($rgb & 0x0000FF);
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$g1 = ($rgb & 0x00FF00) >> 8;
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$b1 = ($rgb & 0xFF0000) >> 16;
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$idx = -1;
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for($i = 0; $i < $this->m_nColors; $i++) {
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$r2 = ($this->m_arColors[$i] & 0x000000FF);
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$g2 = ($this->m_arColors[$i] & 0x0000FF00) >> 8;
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$b2 = ($this->m_arColors[$i] & 0x00FF0000) >> 16;
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$d = abs($r2 - $r1) + abs($g2 - $g1) + abs($b2 - $b1);
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if(($idx == -1) || ($d < $dif)) {
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$idx = $i;
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$dif = $d;
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}
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}
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return $idx;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class CGIFFILEHEADER
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{
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var $m_lpVer;
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var $m_nWidth;
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var $m_nHeight;
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var $m_bGlobalClr;
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var $m_nColorRes;
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var $m_bSorted;
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var $m_nTableSize;
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var $m_nBgColor;
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var $m_nPixelRatio;
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var $m_colorTable;
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///////////////////////////////////////////////////////////////////////////
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// CONSTRUCTOR
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function CGIFFILEHEADER()
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{
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unSet($this->m_lpVer);
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unSet($this->m_nWidth);
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unSet($this->m_nHeight);
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unSet($this->m_bGlobalClr);
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unSet($this->m_nColorRes);
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unSet($this->m_bSorted);
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unSet($this->m_nTableSize);
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unSet($this->m_nBgColor);
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unSet($this->m_nPixelRatio);
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unSet($this->m_colorTable);
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}
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///////////////////////////////////////////////////////////////////////////
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function load($lpData, &$hdrLen)
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{
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$hdrLen = 0;
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$this->m_lpVer = substr($lpData, 0, 6);
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if(($this->m_lpVer <> "GIF87a") && ($this->m_lpVer <> "GIF89a")) {
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return false;
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}
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$this->m_nWidth = $this->w2i(substr($lpData, 6, 2));
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$this->m_nHeight = $this->w2i(substr($lpData, 8, 2));
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if(!$this->m_nWidth || !$this->m_nHeight) {
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return false;
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}
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$b = ord(substr($lpData, 10, 1));
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$this->m_bGlobalClr = ($b & 0x80) ? true : false;
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$this->m_nColorRes = ($b & 0x70) >> 4;
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$this->m_bSorted = ($b & 0x08) ? true : false;
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$this->m_nTableSize = 2 << ($b & 0x07);
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$this->m_nBgColor = ord(substr($lpData, 11, 1));
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$this->m_nPixelRatio = ord(substr($lpData, 12, 1));
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$hdrLen = 13;
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if($this->m_bGlobalClr) {
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$this->m_colorTable = new CGIFCOLORTABLE();
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if(!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize)) {
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return false;
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}
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$hdrLen += 3 * $this->m_nTableSize;
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}
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return true;
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}
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///////////////////////////////////////////////////////////////////////////
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function w2i($str)
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{
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return ord(substr($str, 0, 1)) + (ord(substr($str, 1, 1)) << 8);
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class CGIFIMAGEHEADER
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{
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var $m_nLeft;
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var $m_nTop;
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var $m_nWidth;
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var $m_nHeight;
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var $m_bLocalClr;
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var $m_bInterlace;
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var $m_bSorted;
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var $m_nTableSize;
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var $m_colorTable;
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///////////////////////////////////////////////////////////////////////////
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// CONSTRUCTOR
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function CGIFIMAGEHEADER()
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{
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unSet($this->m_nLeft);
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unSet($this->m_nTop);
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unSet($this->m_nWidth);
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unSet($this->m_nHeight);
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unSet($this->m_bLocalClr);
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unSet($this->m_bInterlace);
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unSet($this->m_bSorted);
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unSet($this->m_nTableSize);
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unSet($this->m_colorTable);
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}
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///////////////////////////////////////////////////////////////////////////
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function load($lpData, &$hdrLen)
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{
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$hdrLen = 0;
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$this->m_nLeft = $this->w2i(substr($lpData, 0, 2));
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$this->m_nTop = $this->w2i(substr($lpData, 2, 2));
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$this->m_nWidth = $this->w2i(substr($lpData, 4, 2));
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$this->m_nHeight = $this->w2i(substr($lpData, 6, 2));
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if(!$this->m_nWidth || !$this->m_nHeight) {
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return false;
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}
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$b = ord($lpData{8});
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$this->m_bLocalClr = ($b & 0x80) ? true : false;
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$this->m_bInterlace = ($b & 0x40) ? true : false;
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$this->m_bSorted = ($b & 0x20) ? true : false;
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$this->m_nTableSize = 2 << ($b & 0x07);
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$hdrLen = 9;
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if($this->m_bLocalClr) {
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$this->m_colorTable = new CGIFCOLORTABLE();
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if(!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize)) {
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return false;
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}
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$hdrLen += 3 * $this->m_nTableSize;
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}
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return true;
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}
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///////////////////////////////////////////////////////////////////////////
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function w2i($str)
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{
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return ord(substr($str, 0, 1)) + (ord(substr($str, 1, 1)) << 8);
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class CGIFIMAGE
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{
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var $m_disp;
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var $m_bUser;
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var $m_bTrans;
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var $m_nDelay;
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var $m_nTrans;
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var $m_lpComm;
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var $m_gih;
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var $m_data;
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var $m_lzw;
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///////////////////////////////////////////////////////////////////////////
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function CGIFIMAGE()
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{
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unSet($this->m_disp);
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unSet($this->m_bUser);
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unSet($this->m_bTrans);
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unSet($this->m_nDelay);
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unSet($this->m_nTrans);
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unSet($this->m_lpComm);
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unSet($this->m_data);
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$this->m_gih = new CGIFIMAGEHEADER();
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$this->m_lzw = new CGIFLZW();
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}
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///////////////////////////////////////////////////////////////////////////
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function load($data, &$datLen)
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{
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$datLen = 0;
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while(true) {
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$b = ord($data[0]);
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$data = substr($data, 1);
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$datLen++;
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switch($b) {
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case 0x21: // Extension
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$len = 0;
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if(!$this->skipExt($data, $len)) {
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return false;
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}
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$datLen += $len;
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break;
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case 0x2C: // Image
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// LOAD HEADER & COLOR TABLE
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$len = 0;
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if(!$this->m_gih->load($data, $len)) {
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return false;
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}
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$data = substr($data, $len);
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$datLen += $len;
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// ALLOC BUFFER
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$len = 0;
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if(!($this->m_data = $this->m_lzw->deCompress($data, $len))) {
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return false;
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}
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$data = substr($data, $len);
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$datLen += $len;
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if($this->m_gih->m_bInterlace) {
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$this->deInterlace();
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}
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return true;
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case 0x3B: // EOF
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default:
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return false;
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}
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}
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return false;
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}
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///////////////////////////////////////////////////////////////////////////
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function skipExt(&$data, &$extLen)
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{
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$extLen = 0;
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$b = ord($data[0]);
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$data = substr($data, 1);
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$extLen++;
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switch($b) {
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case 0xF9: // Graphic Control
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$b = ord($data[1]);
|
|
$this->m_disp = ($b & 0x1C) >> 2;
|
|
$this->m_bUser = ($b & 0x02) ? true : false;
|
|
$this->m_bTrans = ($b & 0x01) ? true : false;
|
|
$this->m_nDelay = $this->w2i(substr($data, 2, 2));
|
|
$this->m_nTrans = ord($data[4]);
|
|
break;
|
|
|
|
case 0xFE: // Comment
|
|
$this->m_lpComm = substr($data, 1, ord($data[0]));
|
|
break;
|
|
|
|
case 0x01: // Plain text
|
|
break;
|
|
|
|
case 0xFF: // Application
|
|
break;
|
|
}
|
|
|
|
// SKIP DEFAULT AS DEFS MAY CHANGE
|
|
$b = ord($data[0]);
|
|
$data = substr($data, 1);
|
|
$extLen++;
|
|
while($b > 0) {
|
|
$data = substr($data, $b);
|
|
$extLen += $b;
|
|
$b = ord($data[0]);
|
|
$data = substr($data, 1);
|
|
$extLen++;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
function w2i($str)
|
|
{
|
|
return ord(substr($str, 0, 1)) + (ord(substr($str, 1, 1)) << 8);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
function deInterlace()
|
|
{
|
|
$data = $this->m_data;
|
|
|
|
for($i = 0; $i < 4; $i++) {
|
|
switch($i) {
|
|
case 0:
|
|
$s = 8;
|
|
$y = 0;
|
|
break;
|
|
|
|
case 1:
|
|
$s = 8;
|
|
$y = 4;
|
|
break;
|
|
|
|
case 2:
|
|
$s = 4;
|
|
$y = 2;
|
|
break;
|
|
|
|
case 3:
|
|
$s = 2;
|
|
$y = 1;
|
|
break;
|
|
}
|
|
|
|
for(; $y < $this->m_gih->m_nHeight; $y += $s) {
|
|
$lne = substr($this->m_data, 0, $this->m_gih->m_nWidth);
|
|
$this->m_data = substr($this->m_data, $this->m_gih->m_nWidth);
|
|
|
|
$data =
|
|
substr($data, 0, $y * $this->m_gih->m_nWidth) .
|
|
$lne .
|
|
substr($data, ($y + 1) * $this->m_gih->m_nWidth);
|
|
}
|
|
}
|
|
|
|
$this->m_data = $data;
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
class CGIF
|
|
{
|
|
var $m_gfh;
|
|
var $m_lpData;
|
|
var $m_img;
|
|
var $m_bLoaded;
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
// CONSTRUCTOR
|
|
function CGIF()
|
|
{
|
|
$this->m_gfh = new CGIFFILEHEADER();
|
|
$this->m_img = new CGIFIMAGE();
|
|
$this->m_lpData = "";
|
|
$this->m_bLoaded = false;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
function ClearData() {
|
|
$this->m_lpData = '';
|
|
unSet($this->m_img->m_data);
|
|
unSet($this->m_img->m_lzw->Next);
|
|
unSet($this->m_img->m_lzw->Vals);
|
|
unSet($this->m_img->m_lzw->Stack);
|
|
unSet($this->m_img->m_lzw->Buf);
|
|
}
|
|
|
|
function loadFile(&$data, $iIndex)
|
|
{
|
|
if($iIndex < 0) {
|
|
return false;
|
|
}
|
|
$this->m_lpData = $data;
|
|
|
|
// GET FILE HEADER
|
|
$len = 0;
|
|
if(!$this->m_gfh->load($this->m_lpData, $len)) {
|
|
return false;
|
|
}
|
|
|
|
$this->m_lpData = substr($this->m_lpData, $len);
|
|
|
|
do {
|
|
$imgLen = 0;
|
|
if(!$this->m_img->load($this->m_lpData, $imgLen)) {
|
|
return false;
|
|
}
|
|
$this->m_lpData = substr($this->m_lpData, $imgLen);
|
|
}
|
|
while($iIndex-- > 0);
|
|
|
|
$this->m_bLoaded = true;
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
?>
|