Viewing file:  FileHeader.php (1.9 KB) -rw-r--r--
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<?php
namespace Mpdf\Gif;
/**
* GIF Util - (C) 2003 Yamasoft (S/C)
*
* All Rights Reserved
*
* This file can be freely copied, distributed, modified, updated by anyone under the only
* condition to leave the original address (Yamasoft, http://www.yamasoft.com) and this header.
*
* @link http://www.yamasoft.com
*/
class FileHeader
{
var $m_lpVer;
var $m_nWidth;
var $m_nHeight;
var $m_bGlobalClr;
var $m_nColorRes;
var $m_bSorted;
var $m_nTableSize;
var $m_nBgColor;
var $m_nPixelRatio;
/**
* @var \Mpdf\Gif\ColorTable
*/
var $m_colorTable;
public function __construct()
{
unset($this->m_lpVer);
unset($this->m_nWidth);
unset($this->m_nHeight);
unset($this->m_bGlobalClr);
unset($this->m_nColorRes);
unset($this->m_bSorted);
unset($this->m_nTableSize);
unset($this->m_nBgColor);
unset($this->m_nPixelRatio);
unset($this->m_colorTable);
}
function load($lpData, &$hdrLen)
{
$hdrLen = 0;
$this->m_lpVer = substr($lpData, 0, 6);
if (($this->m_lpVer <> "GIF87a") && ($this->m_lpVer <> "GIF89a")) {
return false;
}
$this->m_nWidth = $this->w2i(substr($lpData, 6, 2));
$this->m_nHeight = $this->w2i(substr($lpData, 8, 2));
if (!$this->m_nWidth || !$this->m_nHeight) {
return false;
}
$b = ord(substr($lpData, 10, 1));
$this->m_bGlobalClr = ($b & 0x80) ? true : false;
$this->m_nColorRes = ($b & 0x70) >> 4;
$this->m_bSorted = ($b & 0x08) ? true : false;
$this->m_nTableSize = 2 << ($b & 0x07);
$this->m_nBgColor = ord(substr($lpData, 11, 1));
$this->m_nPixelRatio = ord(substr($lpData, 12, 1));
$hdrLen = 13;
if ($this->m_bGlobalClr) {
$this->m_colorTable = new ColorTable();
if (!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize)) {
return false;
}
$hdrLen += 3 * $this->m_nTableSize;
}
return true;
}
function w2i($str)
{
return ord(substr($str, 0, 1)) + (ord(substr($str, 1, 1)) << 8);
}
}
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