705 lines
No EOL
15 KiB
PHP
705 lines
No EOL
15 KiB
PHP
<?php
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/**
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* Classes used for reading gif files (in case PHP's GD doesn't provide the
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* proper gif-functions).
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*
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* Gif Util copyright 2003 by Yamasoft (S/C). All rights reserved.
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* Do not remove this portion of the header, or use these functions except
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* from the original author. To get it, please navigate to:
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* http://www.yamasoft.com/php-gif.zip
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*
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* Simple Machines Forum (SMF)
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*
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* @package SMF
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* @author Simple Machines https://www.simplemachines.org
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* @copyright 2022 Simple Machines and individual contributors
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* @license https://www.simplemachines.org/about/smf/license.php BSD
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*
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* @version 2.1.0
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*/
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if (!defined('SMF'))
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die('No direct access...');
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/**
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* Class gif_lzw_compression
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*
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* An implementation of the LZW compression algorithm
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*/
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class gif_lzw_compression
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{
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public $MAX_LZW_BITS;
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public $Fresh, $CodeSize, $SetCodeSize, $MaxCode, $MaxCodeSize, $FirstCode, $OldCode;
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public $ClearCode, $EndCode, $Next, $Vals, $Stack, $sp, $Buf, $CurBit, $LastBit, $Done, $LastByte;
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public function __construct()
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{
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$this->MAX_LZW_BITS = 12;
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unset($this->Next, $this->Vals, $this->Stack, $this->Buf);
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$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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public 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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$this->LZWCommand($data, true);
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while (($iIndex = $this->LZWCommand($data, false)) >= 0)
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$ret .= chr($iIndex);
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$datLen = $stLen - strlen($data);
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if ($iIndex != -2)
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return false;
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return $ret;
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}
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public function LZWCommand(&$data, $bInit)
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{
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if ($bInit)
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{
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$this->SetCodeSize = ord($data[0]);
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$data = substr($data, 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->GetCode($data, $bInit);
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$this->Fresh = 1;
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for ($i = 0; $i < $this->ClearCode; $i++)
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{
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$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); $i++)
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{
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$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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if ($this->Fresh)
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{
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$this->Fresh = 0;
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do
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{
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$this->FirstCode = $this->GetCode($data, $bInit);
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$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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{
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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, $bInit)) >= 0)
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{
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if ($Code == $this->ClearCode)
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{
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for ($i = 0; $i < $this->ClearCode; $i++)
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{
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$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); $i++)
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{
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$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, $bInit);
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$this->OldCode = $this->FirstCode;
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return $this->FirstCode;
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}
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if ($Code == $this->EndCode)
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return -2;
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$InCode = $Code;
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if ($Code >= $this->MaxCode)
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{
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$this->Stack[$this->sp] = $this->FirstCode;
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$this->sp++;
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$Code = $this->OldCode;
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}
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while ($Code >= $this->ClearCode)
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{
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$this->Stack[$this->sp] = $this->Vals[$Code];
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$this->sp++;
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if ($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] = $this->FirstCode;
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$this->sp++;
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if (($Code = $this->MaxCode) < (1 << $this->MAX_LZW_BITS))
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{
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$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 << $this->MAX_LZW_BITS)))
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{
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$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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{
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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 $Code;
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}
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public function GetCode(&$data, $bInit)
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{
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if ($bInit)
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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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if (($this->CurBit + $this->CodeSize) >= $this->LastBit)
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{
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if ($this->Done)
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{
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// Ran off the end of my bits...
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if ($this->CurBit >= $this->LastBit)
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return 0;
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return -1;
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}
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$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[0]);
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$data = substr($data, 1);
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if ($count)
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{
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for ($i = 0; $i < $count; $i++)
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$this->Buf[2 + $i] = ord($data[$i]);
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$data = substr($data, $count);
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}
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else
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$this->Done = 1;
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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) << $j;
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$this->CurBit += $this->CodeSize;
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return $iRet;
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}
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}
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class gif_color_table
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{
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public $m_nColors;
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public $m_arColors;
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public function __construct()
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{
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unset($this->m_nColors, $this->m_arColors);
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}
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public function load($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; $i++)
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{
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$rgb = substr($lpData, $i * 3, 3);
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if (strlen($rgb) < 3)
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return false;
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$this->m_arColors[] = (ord($rgb[2]) << 16) + (ord($rgb[1]) << 8) + ord($rgb[0]);
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$this->m_nColors++;
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}
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return true;
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}
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public function toString()
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{
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$ret = '';
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for ($i = 0; $i < $this->m_nColors; $i++)
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{
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$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 $ret;
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}
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public function colorIndex($rgb)
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{
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$dif = 0;
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$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; $i++)
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{
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$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 < $dif))
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{
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$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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class gif_file_header
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{
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public $m_lpVer, $m_nWidth, $m_nHeight, $m_bGlobalClr, $m_nColorRes;
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public $m_bSorted, $m_nTableSize, $m_nBgColor, $m_nPixelRatio;
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public $m_colorTable;
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public function __construct()
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{
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unset($this->m_lpVer, $this->m_nWidth, $this->m_nHeight, $this->m_bGlobalClr, $this->m_nColorRes);
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unset($this->m_bSorted, $this->m_nTableSize, $this->m_nBgColor, $this->m_nPixelRatio, $this->m_colorTable);
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}
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public function load($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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list ($this->m_nWidth, $this->m_nHeight) = array_values(unpack('v2', substr($lpData, 6, 4)));
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if (!$this->m_nWidth || !$this->m_nHeight)
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return false;
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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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{
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$this->m_colorTable = new gif_color_table();
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if (!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize))
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return false;
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$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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class gif_image_header
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{
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public $m_nLeft, $m_nTop, $m_nWidth, $m_nHeight, $m_bLocalClr;
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public $m_bInterlace, $m_bSorted, $m_nTableSize, $m_colorTable;
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public function __construct()
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{
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unset($this->m_nLeft, $this->m_nTop, $this->m_nWidth, $this->m_nHeight, $this->m_bLocalClr);
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unset($this->m_bInterlace, $this->m_bSorted, $this->m_nTableSize, $this->m_colorTable);
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}
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public function load($lpData, &$hdrLen)
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{
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$hdrLen = 0;
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// Get the width/height/etc. from the header.
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list ($this->m_nLeft, $this->m_nTop, $this->m_nWidth, $this->m_nHeight) = array_values(unpack('v4', substr($lpData, 0, 8)));
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if (!$this->m_nWidth || !$this->m_nHeight)
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return false;
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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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{
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$this->m_colorTable = new gif_color_table();
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if (!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize))
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return false;
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$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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class gif_image
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{
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public $m_disp, $m_bUser, $m_bTrans, $m_nDelay, $m_nTrans, $m_lpComm;
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public $m_gih, $m_data, $m_lzw;
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public function __construct()
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{
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unset($this->m_disp, $this->m_bUser, $this->m_nDelay, $this->m_nTrans, $this->m_lpComm, $this->m_data);
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$this->m_gih = new gif_image_header();
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$this->m_lzw = new gif_lzw_compression();
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}
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public function load($data, &$datLen)
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{
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$datLen = 0;
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while (true)
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{
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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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{
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// Extension...
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case 0x21:
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$len = 0;
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if (!$this->skipExt($data, $len))
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return false;
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$datLen += $len;
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break;
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// Image...
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case 0x2C:
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// Load the header and color table.
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$len = 0;
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if (!$this->m_gih->load($data, $len))
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return false;
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$data = substr($data, $len);
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$datLen += $len;
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// Decompress the data, and ride on home ;).
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$len = 0;
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if (!($this->m_data = $this->m_lzw->decompress($data, $len)))
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return false;
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$datLen += $len;
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if ($this->m_gih->m_bInterlace)
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$this->deInterlace();
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return true;
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case 0x3B: // EOF
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default:
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return false;
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}
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}
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return false;
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}
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public function skipExt(&$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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{
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// Graphic Control...
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case 0xF9:
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$b = ord($data[1]);
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$this->m_disp = ($b & 0x1C) >> 2;
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$this->m_bUser = ($b & 0x02) ? true : false;
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$this->m_bTrans = ($b & 0x01) ? true : false;
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list ($this->m_nDelay) = array_values(unpack('v', substr($data, 2, 2)));
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$this->m_nTrans = ord($data[4]);
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break;
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// Comment...
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case 0xFE:
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$this->m_lpComm = substr($data, 1, ord($data[0]));
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break;
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// Plain text...
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case 0x01:
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break;
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// Application...
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case 0xFF:
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break;
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}
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// Skip default as defs may change.
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$b = ord($data[0]);
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$data = substr($data, 1);
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$extLen++;
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while ($b > 0)
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{
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$data = substr($data, $b);
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$extLen += $b;
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$b = ord($data[0]);
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$data = substr($data, 1);
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$extLen++;
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}
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return true;
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}
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public function deInterlace()
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{
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$data = $this->m_data;
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for ($i = 0; $i < 4; $i++)
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{
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switch ($i)
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{
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case 0:
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$s = 8;
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$y = 0;
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break;
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case 1:
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$s = 8;
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$y = 4;
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break;
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case 2:
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$s = 4;
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$y = 2;
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break;
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case 3:
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$s = 2;
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$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 gif_file
|
|
{
|
|
public $header, $image, $data, $loaded;
|
|
|
|
public function __construct()
|
|
{
|
|
$this->data = '';
|
|
$this->loaded = false;
|
|
$this->header = new gif_file_header();
|
|
$this->image = new gif_image();
|
|
}
|
|
|
|
public function loadFile($filename, $iIndex)
|
|
{
|
|
if ($iIndex < 0)
|
|
return false;
|
|
|
|
$this->data = @file_get_contents($filename);
|
|
if ($this->data === false)
|
|
return false;
|
|
|
|
// Tell the header to load up....
|
|
$len = 0;
|
|
if (!$this->header->load($this->data, $len))
|
|
return false;
|
|
|
|
$this->data = substr($this->data, $len);
|
|
|
|
// Keep reading (at least once) so we get to the actual image we're looking for.
|
|
for ($j = 0; $j <= $iIndex; $j++)
|
|
{
|
|
$imgLen = 0;
|
|
if (!$this->image->load($this->data, $imgLen))
|
|
return false;
|
|
|
|
$this->data = substr($this->data, $imgLen);
|
|
}
|
|
|
|
$this->loaded = true;
|
|
return true;
|
|
}
|
|
|
|
public function get_png_data($background_color)
|
|
{
|
|
if (!$this->loaded)
|
|
return false;
|
|
|
|
// Prepare the color table.
|
|
if ($this->image->m_gih->m_bLocalClr)
|
|
{
|
|
$colors = $this->image->m_gih->m_nTableSize;
|
|
$pal = $this->image->m_gih->m_colorTable->toString();
|
|
|
|
if ($background_color != -1)
|
|
$background_color = $this->image->m_gih->m_colorTable->colorIndex($background_color);
|
|
}
|
|
elseif ($this->header->m_bGlobalClr)
|
|
{
|
|
$colors = $this->header->m_nTableSize;
|
|
$pal = $this->header->m_colorTable->toString();
|
|
|
|
if ($background_color != -1)
|
|
$background_color = $this->header->m_colorTable->colorIndex($background_color);
|
|
}
|
|
else
|
|
{
|
|
$colors = 0;
|
|
$background_color = -1;
|
|
}
|
|
|
|
if ($background_color == -1)
|
|
$background_color = $this->header->m_nBgColor;
|
|
|
|
$data = &$this->image->m_data;
|
|
$header = &$this->image->m_gih;
|
|
|
|
$i = 0;
|
|
$bmp = '';
|
|
|
|
// Prepare the bitmap itself.
|
|
for ($y = 0; $y < $this->header->m_nHeight; $y++)
|
|
{
|
|
$bmp .= "\x00";
|
|
|
|
for ($x = 0; $x < $this->header->m_nWidth; $x++, $i++)
|
|
{
|
|
// Is this in the proper range? If so, get the specific pixel data...
|
|
if ($x >= $header->m_nLeft && $y >= $header->m_nTop && $x < ($header->m_nLeft + $header->m_nWidth) && $y < ($header->m_nTop + $header->m_nHeight))
|
|
$bmp .= $data[$i];
|
|
// Otherwise, this is background...
|
|
else
|
|
$bmp .= chr($background_color);
|
|
}
|
|
}
|
|
|
|
$bmp = gzcompress($bmp, 9);
|
|
|
|
// Output the basic signature first of all.
|
|
$out = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
|
|
|
|
// Now, we want the header...
|
|
$out .= "\x00\x00\x00\x0D";
|
|
$tmp = 'IHDR' . pack('N', (int) $this->header->m_nWidth) . pack('N', (int) $this->header->m_nHeight) . "\x08\x03\x00\x00\x00";
|
|
$out .= $tmp . pack('N', smf_crc32($tmp));
|
|
|
|
// The palette, assuming we have one to speak of...
|
|
if ($colors > 0)
|
|
{
|
|
$out .= pack('N', (int) $colors * 3);
|
|
$tmp = 'PLTE' . $pal;
|
|
$out .= $tmp . pack('N', smf_crc32($tmp));
|
|
}
|
|
|
|
// Do we have any transparency we want to make available?
|
|
if ($this->image->m_bTrans && $colors > 0)
|
|
{
|
|
$out .= pack('N', (int) $colors);
|
|
$tmp = 'tRNS';
|
|
|
|
// Stick each color on - full transparency or none.
|
|
for ($i = 0; $i < $colors; $i++)
|
|
$tmp .= $i == $this->image->m_nTrans ? "\x00" : "\xFF";
|
|
|
|
$out .= $tmp . pack('N', smf_crc32($tmp));
|
|
}
|
|
|
|
// Here's the data itself!
|
|
$out .= pack('N', strlen($bmp));
|
|
$tmp = 'IDAT' . $bmp;
|
|
$out .= $tmp . pack('N', smf_crc32($tmp));
|
|
|
|
// EOF marker...
|
|
$out .= "\x00\x00\x00\x00" . 'IEND' . "\xAE\x42\x60\x82";
|
|
|
|
return $out;
|
|
}
|
|
}
|
|
|
|
// 64-bit only functions?
|
|
if (!function_exists('smf_crc32'))
|
|
{
|
|
require_once $sourcedir . '/Subs-Compat.php';
|
|
}
|
|
|
|
?>
|