CGIFLZW

Complexity

Total Complexity

31

Size/Duplication

Total Lines	210
Duplicated Lines	0 %

Importance

Changes	4
Bugs	0	Features	0

4 Methods

Rating	Name	Duplication	Size	Complexity
B	GetCode()	0	46	8
D	LZWCommand()	0	112	19
A	__construct()	0	12	1
A	deCompress()	0	20	3

<?php
///////////////////////////////////////////////////////////////////////////////////////////////////
// GIF Util - (C) 2003 Yamasoft (S/C)
// http://www.yamasoft.com
// 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.
///////////////////////////////////////////////////////////////////////////////////////////////////
// <gif>  = gif_loadFile(filename, [index])
// <bool> = gif_getSize(<gif> or filename, &width, &height)
// <bool> = gif_outputAsPng(<gif>, filename, [bgColor])
// <bool> = gif_outputAsBmp(<gif>, filename, [bgcolor])
// <bool> = gif_outputAsJpeg(<gif>, filename, [bgcolor]) - use cjpeg if available otherwise uses GD
///////////////////////////////////////////////////////////////////////////////////////////////////
// Original code by Fabien Ezber
// Modified by James Heinrich <info@silisoftware.com> for use in phpThumb() - December 10, 2003
// * Added function gif_loadFileToGDimageResource() - this returns a GD image resource
// * Modified gif_outputAsJpeg() to check if it's running under Windows, or if cjpeg is not
//   available, in which case it will attempt to output JPEG using GD functions
// * added @ error-suppression to two lines where it checks: if ($this->m_img->m_bTrans)
//   otherwise warnings are generated if error_reporting == E_ALL
///////////////////////////////////////////////////////////////////////////////////////////////////

function gif_loadFile($lpszFileName, $iIndex = 0)
{
    $gif = new CGIF();
    if ($gif->loadFile($lpszFileName, $iIndex)) {
        return $gif;
    }
    return false;
}

///////////////////////////////////////////////////////////////////////////////////////////////////

// Added by James Heinrich <info@silisoftware.com> - December 10, 2003
function gif_loadFileToGDimageResource($gifFilename, $bgColor = -1)
{
    if ($gif = gif_loadFile($gifFilename)) {
        if (!phpthumb_functions::FunctionIsDisabled('set_time_limit')) {
            // shouldn't take nearly this long
            set_time_limit(120);
        }
        // general strategy: convert raw data to PNG then convert PNG data to GD image resource
        $PNGdata = $gif->getPng($bgColor);
        if ($img = @imagecreatefromstring($PNGdata)) {

It seems like $PNGdata can also be of type false; however, parameter $image of imagecreatefromstring() does only seem to accept string, maybe add an additional type check?

            // excellent - PNG image data successfully converted to GD image
            return $img;
        } elseif ($img = $gif->getGD_PixelPlotterVersion()) {
            // problem: imagecreatefromstring() didn't like the PNG image data.
            //   This has been known to happen in PHP v4.0.6
            // solution: take the raw image data and create a new GD image and plot
            //   pixel-by-pixel on the GD image. This is extremely slow, but it does
            //   work and a slow solution is better than no solution, right? :)
            return $img;
        }
    }
    return false;
}

///////////////////////////////////////////////////////////////////////////////////////////////////

function gif_outputAsBmp($gif, $lpszFileName, $bgColor = -1)
{
    if (!isset($gif) || (@get_class($gif) <> 'cgif') || !$gif->loaded() || ($lpszFileName == '')) {
        return false;
    }

    $fd = $gif->getBmp($bgColor);
    if (strlen($fd) <= 0) {
        return false;
    }

    if (!($fh = @fopen($lpszFileName, 'wb'))) {
        return false;
    }
    @fwrite($fh, $fd, strlen($fd));

It seems like you do not handle an error condition for fwrite(). This can introduce security issues, and is generally not recommended.

    @fflush($fh);

It seems like you do not handle an error condition for fflush(). This can introduce security issues, and is generally not recommended.

    @fclose($fh);

It seems like you do not handle an error condition for fclose(). This can introduce security issues, and is generally not recommended.

    return true;
}

///////////////////////////////////////////////////////////////////////////////////////////////////

function gif_outputAsPng($gif, $lpszFileName, $bgColor = -1)
{
    if (!isset($gif) || (@get_class($gif) <> 'cgif') || !$gif->loaded() || ($lpszFileName == '')) {
        return false;
    }

    $fd = $gif->getPng($bgColor);
    if (strlen($fd) <= 0) {
        return false;
    }

    if (!($fh = @fopen($lpszFileName, 'wb'))) {
        return false;
    }
    @fwrite($fh, $fd, strlen($fd));

It seems like you do not handle an error condition for fwrite(). This can introduce security issues, and is generally not recommended.

    @fflush($fh);

It seems like you do not handle an error condition for fflush(). This can introduce security issues, and is generally not recommended.

    @fclose($fh);

It seems like you do not handle an error condition for fclose(). This can introduce security issues, and is generally not recommended.

    return true;
}

///////////////////////////////////////////////////////////////////////////////////////////////////

function gif_outputAsJpeg($gif, $lpszFileName, $bgColor = -1)
{
    // JPEG output that does not require cjpeg added by James Heinrich <info@silisoftware.com> - December 10, 2003
    if ((strtoupper(substr(PHP_OS, 0, 3)) != 'WIN') && (file_exists('/usr/local/bin/cjpeg') || shell_exec('which cjpeg'))) {
        if (gif_outputAsBmp($gif, $lpszFileName . '.bmp', $bgColor)) {
            exec('cjpeg ' . $lpszFileName . '.bmp >' . $lpszFileName . ' 2>/dev/null');
            @unlink($lpszFileName . '.bmp');

It seems like you do not handle an error condition for unlink(). This can introduce security issues, and is generally not recommended.

            if (@file_exists($lpszFileName)) {
                if (@filesize($lpszFileName) > 0) {
                    return true;
                }

                @unlink($lpszFileName);
            }
        }
    } else {
        // either Windows, or cjpeg not found in path
        if ($img = @imagecreatefromstring($gif->getPng($bgColor))) {
            if (@imagejpeg($img, $lpszFileName)) {
                return true;
            }
        }
    }

    return false;
}

///////////////////////////////////////////////////////////////////////////////////////////////////

function gif_getSize($gif, &$width, &$height)
{
    if (isset($gif) && (@get_class($gif) == 'cgif') && $gif->loaded()) {
        $width  = $gif->width();
        $height = $gif->height();
    } elseif (@file_exists($gif)) {
        $myGIF = new CGIF();
        if (!$myGIF->getSize($gif, $width, $height)) {
            return false;
        }
    } else {
        return false;
    }

    return true;
}

///////////////////////////////////////////////////////////////////////////////////////////////////

class CGIFLZW
{
    public $MAX_LZW_BITS;
    public $Fresh, $CodeSize, $SetCodeSize, $MaxCode, $MaxCodeSize, $FirstCode, $OldCode;
    public $ClearCode, $EndCode, $Next, $Vals, $Stack, $sp, $Buf, $CurBit, $LastBit, $Done, $LastByte;
    ///////////////////////////////////////////////////////////////////////////

    // CONSTRUCTOR
    public function __construct()
    {
        $this->MAX_LZW_BITS = 12;
        unset($this->Next);
        unset($this->Vals);
        unset($this->Stack);
        unset($this->Buf);

        $this->Next  = range(0, (1 << $this->MAX_LZW_BITS) - 1);
        $this->Vals  = range(0, (1 << $this->MAX_LZW_BITS) - 1);
        $this->Stack = range(0, (1 << ($this->MAX_LZW_BITS + 1)) - 1);
        $this->Buf   = range(0, 279);
    }

    ///////////////////////////////////////////////////////////////////////////

    public function deCompress($data, &$datLen)
    {
        $stLen  = strlen($data);
        $datLen = 0;
        $ret    = '';

        // INITIALIZATION
        $this->LZWCommand($data, true);

        while (($iIndex = $this->LZWCommand($data, false)) >= 0) {
            $ret .= chr($iIndex);
        }

        $datLen = $stLen - strlen($data);

        if ($iIndex != -2) {
            return false;
        }

        return $ret;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function LZWCommand(&$data, $bInit)
    {
        if ($bInit) {
            $this->SetCodeSize = ord($data[0]);
            $data              = substr($data, 1);

            $this->CodeSize    = $this->SetCodeSize + 1;
            $this->ClearCode   = 1 << $this->SetCodeSize;
            $this->EndCode     = $this->ClearCode + 1;
            $this->MaxCode     = $this->ClearCode + 2;
            $this->MaxCodeSize = $this->ClearCode << 1;

            $this->GetCode($data, $bInit);

            $this->Fresh = 1;
            for ($i = 0; $i < $this->ClearCode; $i++) {
                $this->Next[$i] = 0;
                $this->Vals[$i] = $i;
            }

            for (; $i < (1 << $this->MAX_LZW_BITS); $i++) {
                $this->Next[$i] = 0;
                $this->Vals[$i] = 0;
            }

            $this->sp = 0;
            return 1;
        }

        if ($this->Fresh) {
            $this->Fresh = 0;
            do {
                $this->FirstCode = $this->GetCode($data, $bInit);
                $this->OldCode   = $this->FirstCode;
            } while ($this->FirstCode == $this->ClearCode);

            return $this->FirstCode;
        }

        if ($this->sp > 0) {
            $this->sp--;
            return $this->Stack[$this->sp];
        }

        while (($Code = $this->GetCode($data, $bInit)) >= 0) {
            if ($Code == $this->ClearCode) {
                for ($i = 0; $i < $this->ClearCode; $i++) {
                    $this->Next[$i] = 0;
                    $this->Vals[$i] = $i;
                }

                for (; $i < (1 << $this->MAX_LZW_BITS); $i++) {
                    $this->Next[$i] = 0;
                    $this->Vals[$i] = 0;
                }

                $this->CodeSize    = $this->SetCodeSize + 1;
                $this->MaxCodeSize = $this->ClearCode << 1;
                $this->MaxCode     = $this->ClearCode + 2;
                $this->sp          = 0;
                $this->FirstCode   = $this->GetCode($data, $bInit);
                $this->OldCode     = $this->FirstCode;

                return $this->FirstCode;
            }

            if ($Code == $this->EndCode) {
                return -2;
            }

            $InCode = $Code;
            if ($Code >= $this->MaxCode) {
                $this->Stack[$this->sp] = $this->FirstCode;
                $this->sp++;
                $Code = $this->OldCode;
            }

            while ($Code >= $this->ClearCode) {
                $this->Stack[$this->sp] = $this->Vals[$Code];
                $this->sp++;

                if ($Code == $this->Next[$Code]) // Circular table entry, big GIF Error!
                {
                    return -1;
                }

                $Code = $this->Next[$Code];
            }

            $this->FirstCode        = $this->Vals[$Code];
            $this->Stack[$this->sp] = $this->FirstCode;
            $this->sp++;

            if (($Code = $this->MaxCode) < (1 << $this->MAX_LZW_BITS)) {
                $this->Next[$Code] = $this->OldCode;
                $this->Vals[$Code] = $this->FirstCode;
                $this->MaxCode++;

                if (($this->MaxCode >= $this->MaxCodeSize) && ($this->MaxCodeSize < (1 << $this->MAX_LZW_BITS))) {
                    $this->MaxCodeSize *= 2;
                    $this->CodeSize++;
                }
            }

            $this->OldCode = $InCode;
            if ($this->sp > 0) {
                $this->sp--;
                return $this->Stack[$this->sp];
            }
        }

        return $Code;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function GetCode(&$data, $bInit)
    {
        if ($bInit) {
            $this->CurBit   = 0;
            $this->LastBit  = 0;
            $this->Done     = 0;
            $this->LastByte = 2;
            return 1;
        }

        if (($this->CurBit + $this->CodeSize) >= $this->LastBit) {
            if ($this->Done) {
                if ($this->CurBit >= $this->LastBit) {
                    // Ran off the end of my bits
                    return 0;
                }
                return -1;
            }

            $this->Buf[0] = $this->Buf[$this->LastByte - 2];
            $this->Buf[1] = $this->Buf[$this->LastByte - 1];

            $Count = ord($data[0]);
            $data  = substr($data, 1);

            if ($Count) {
                for ($i = 0; $i < $Count; $i++) {
                    $this->Buf[2 + $i] = ord($data[$i]);
                }
                $data = substr($data, $Count);
            } else {
                $this->Done = 1;
            }

            $this->LastByte = 2 + $Count;
            $this->CurBit   = ($this->CurBit - $this->LastBit) + 16;
            $this->LastBit  = (2 + $Count) << 3;
        }

        $iRet = 0;
        for ($i = $this->CurBit, $j = 0; $j < $this->CodeSize; $i++, $j++) {
            $iRet |= (($this->Buf[(int)($i / 8)] & (1 << ($i % 8))) != 0) << $j;
        }

        $this->CurBit += $this->CodeSize;
        return $iRet;
    }
}

///////////////////////////////////////////////////////////////////////////////////////////////////

class CGIFCOLORTABLE
{
    public $m_nColors;
    public $m_arColors;
    ///////////////////////////////////////////////////////////////////////////

    // CONSTRUCTOR
    public function __construct()
    {
        unset($this->m_nColors);
        unset($this->m_arColors);
    }

    ///////////////////////////////////////////////////////////////////////////

    public function load($lpData, $num)
    {
        $this->m_nColors  = 0;
        $this->m_arColors = [];

        for ($i = 0; $i < $num; $i++) {
            $rgb = substr($lpData, $i * 3, 3);
            if (strlen($rgb) < 3) {
                return false;
            }

            $this->m_arColors[] = (ord($rgb[2]) << 16) + (ord($rgb[1]) << 8) + ord($rgb[0]);
            $this->m_nColors++;
        }

        return true;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function toString()
    {
        $ret = '';

        for ($i = 0; $i < $this->m_nColors; $i++) {
            $ret .= chr($this->m_arColors[$i] & 0x000000FF) . // R
                    chr(($this->m_arColors[$i] & 0x0000FF00) >> 8) . // G
                    chr(($this->m_arColors[$i] & 0x00FF0000) >> 16);  // B
        }

        return $ret;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function toRGBQuad()
    {
        $ret = '';

        for ($i = 0; $i < $this->m_nColors; $i++) {
            $ret .= chr(($this->m_arColors[$i] & 0x00FF0000) >> 16) . // B
                    chr(($this->m_arColors[$i] & 0x0000FF00) >> 8) . // G
                    chr($this->m_arColors[$i] & 0x000000FF) . // R
                    "\x00";
        }

        return $ret;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function colorIndex($rgb)
    {
        $rgb = (int)$rgb & 0xFFFFFF;
        $r1  = ($rgb & 0x0000FF);
        $g1  = ($rgb & 0x00FF00) >> 8;
        $b1  = ($rgb & 0xFF0000) >> 16;
        $idx = -1;
        $dif = 0;

        for ($i = 0; $i < $this->m_nColors; $i++) {
            $r2 = ($this->m_arColors[$i] & 0x000000FF);
            $g2 = ($this->m_arColors[$i] & 0x0000FF00) >> 8;
            $b2 = ($this->m_arColors[$i] & 0x00FF0000) >> 16;
            $d  = abs($r2 - $r1) + abs($g2 - $g1) + abs($b2 - $b1);

            if (($idx == -1) || ($d < $dif)) {
                $idx = $i;
                $dif = $d;
            }
        }

        return $idx;
    }
}

///////////////////////////////////////////////////////////////////////////////////////////////////

class CGIFFILEHEADER
{
    public $m_lpVer;
    public $m_nWidth;
    public $m_nHeight;
    public $m_bGlobalClr;
    public $m_nColorRes;
    public $m_bSorted;
    public $m_nTableSize;
    public $m_nBgColor;
    public $m_nPixelRatio;
    public $m_colorTable;
    ///////////////////////////////////////////////////////////////////////////

    // CONSTRUCTOR
    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);
    }

    ///////////////////////////////////////////////////////////////////////////

    public 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;
        }

        $b                   = ord($lpData[10]);
        $this->m_bGlobalClr  = ($b & 0x80) ? true : false;
        $this->m_nColorRes   = ($b & 0x70) >> 4;
        $this->m_bSorted     = ($b & 0x08) ? true : false;
        $this->m_nTableSize  = 2 << ($b & 0x07);
        $this->m_nBgColor    = ord($lpData[11]);
        $this->m_nPixelRatio = ord($lpData[12]);
        $hdrLen              = 13;

        if ($this->m_bGlobalClr) {
            $this->m_colorTable = new CGIFCOLORTABLE();
            if (!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize)) {
                return false;
            }
            $hdrLen += 3 * $this->m_nTableSize;
        }

        return true;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function w2i($str)
    {
        return ord($str[0]) + (ord($str[1]) << 8);
    }
}

///////////////////////////////////////////////////////////////////////////////////////////////////

class CGIFIMAGEHEADER
{
    public $m_nLeft;
    public $m_nTop;
    public $m_nWidth;
    public $m_nHeight;
    public $m_bLocalClr;
    public $m_bInterlace;
    public $m_bSorted;
    public $m_nTableSize;
    public $m_colorTable;
    ///////////////////////////////////////////////////////////////////////////

    // CONSTRUCTOR
    public function __construct()
    {
        unset($this->m_nLeft);
        unset($this->m_nTop);
        unset($this->m_nWidth);
        unset($this->m_nHeight);
        unset($this->m_bLocalClr);
        unset($this->m_bInterlace);
        unset($this->m_bSorted);
        unset($this->m_nTableSize);
        unset($this->m_colorTable);
    }

    ///////////////////////////////////////////////////////////////////////////

    public function load($lpData, &$hdrLen)
    {
        $hdrLen = 0;

        $this->m_nLeft   = $this->w2i(substr($lpData, 0, 2));
        $this->m_nTop    = $this->w2i(substr($lpData, 2, 2));
        $this->m_nWidth  = $this->w2i(substr($lpData, 4, 2));
        $this->m_nHeight = $this->w2i(substr($lpData, 6, 2));

        if (!$this->m_nWidth || !$this->m_nHeight) {
            return false;
        }

        $b                  = ord($lpData[8]);
        $this->m_bLocalClr  = ($b & 0x80) ? true : false;
        $this->m_bInterlace = ($b & 0x40) ? true : false;
        $this->m_bSorted    = ($b & 0x20) ? true : false;
        $this->m_nTableSize = 2 << ($b & 0x07);
        $hdrLen             = 9;

        if ($this->m_bLocalClr) {
            $this->m_colorTable = new CGIFCOLORTABLE();
            if (!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize)) {
                return false;
            }
            $hdrLen += 3 * $this->m_nTableSize;
        }

        return true;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function w2i($str)
    {
        return ord($str[0]) + (ord($str[1]) << 8);
    }
}

///////////////////////////////////////////////////////////////////////////////////////////////////

class CGIFIMAGE
{
    public $m_disp;
    public $m_bUser;
    public $m_bTrans;
    public $m_nDelay;
    public $m_nTrans;
    public $m_lpComm;
    public $m_gih;
    public $m_data;
    public $m_lzw;

    ///////////////////////////////////////////////////////////////////////////

    public function __construct()
    {
        unset($this->m_disp);
        unset($this->m_bUser);
        unset($this->m_bTrans);
        unset($this->m_nDelay);
        unset($this->m_nTrans);
        unset($this->m_lpComm);
        unset($this->m_data);
        $this->m_gih = new CGIFIMAGEHEADER();
        $this->m_lzw = new CGIFLZW();
    }

    ///////////////////////////////////////////////////////////////////////////

    public function load($data, &$datLen)
    {
        $datLen = 0;

        while (true) {
            $b    = ord($data[0]);
            $data = substr($data, 1);
            $datLen++;

            switch ($b) {
                case 0x21: // Extension
                    if (!$this->skipExt($data, $len = 0)) {

$len = 0 cannot be passed to CGIFIMAGE::skipExt() as the parameter $extLen expects a reference.

                        return false;
                    }
                    $datLen += $len;
                    break;

                case 0x2C: // Image
                    // LOAD HEADER & COLOR TABLE
                    if (!$this->m_gih->load($data, $len = 0)) {

$len = 0 cannot be passed to CGIFIMAGEHEADER::load() as the parameter $hdrLen expects a reference.

                        return false;
                    }
                    $data   = substr($data, $len);
                    $datLen += $len;

                    // ALLOC BUFFER
                    if (!($this->m_data = $this->m_lzw->deCompress($data, $len = 0))) {

$len = 0 cannot be passed to CGIFLZW::deCompress() as the parameter $datLen expects a reference.

                        return false;
                    }
                    $data   = substr($data, $len);

The assignment to $data is dead and can be removed.

                    $datLen += $len;

                    if ($this->m_gih->m_bInterlace) {
                        $this->deInterlace();
                    }
                    return true;

                case 0x3B: // EOF
                default:
                    return false;
            }
        }
        return false;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function skipExt(&$data, &$extLen)
    {
        $extLen = 0;

        $b    = ord($data[0]);
        $data = substr($data, 1);
        $extLen++;

        switch ($b) {
            case 0xF9: // Graphic Control
                $b              = ord($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;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function w2i($str)
    {
        return ord($str[0]) + (ord($str[1]) << 8);
    }

    ///////////////////////////////////////////////////////////////////////////

    public function deInterlace()
    {
        $data = $this->m_data;
        $s    = 0;
        $y    = 0;

        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
{
    public $m_gfh;
    public $m_lpData;
    public $m_img;
    public $m_bLoaded;
    ///////////////////////////////////////////////////////////////////////////

    // CONSTRUCTOR
    public function __construct()
    {
        $this->m_gfh     = new CGIFFILEHEADER();
        $this->m_img     = new CGIFIMAGE();
        $this->m_lpData  = '';
        $this->m_bLoaded = false;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function loadFile($lpszFileName, $iIndex)
    {
        if ($iIndex < 0) {
            return false;
        }

        // READ FILE
        if (!($fh = @fopen($lpszFileName, 'rb'))) {
            return false;
        }
        $this->m_lpData = @fread($fh, @filesize($lpszFileName));

It seems like @filesize($lpszFileName) can also be of type false; however, parameter $length of fread() does only seem to accept integer, maybe add an additional type check?

        fclose($fh);

        // GET FILE HEADER
        if (!$this->m_gfh->load($this->m_lpData, $len = 0)) {

$len = 0 cannot be passed to CGIFFILEHEADER::load() as the parameter $hdrLen expects a reference.

            return false;
        }
        $this->m_lpData = substr($this->m_lpData, $len);

It seems like $this->m_lpData can also be of type false; however, parameter $string of substr() does only seem to accept string, maybe add an additional type check?

        do {
            if (!$this->m_img->load($this->m_lpData, $imgLen = 0)) {

$imgLen = 0 cannot be passed to CGIFIMAGE::load() as the parameter $datLen expects a reference.

                return false;
            }
            $this->m_lpData = substr($this->m_lpData, $imgLen);
        } while ($iIndex-- > 0);

        $this->m_bLoaded = true;
        return true;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function getSize($lpszFileName, &$width, &$height)
    {
        if (!($fh = @fopen($lpszFileName, 'rb'))) {
            return false;
        }
        $data = @fread($fh, @filesize($lpszFileName));

It seems like @filesize($lpszFileName) can also be of type false; however, parameter $length of fread() does only seem to accept integer, maybe add an additional type check?

        @fclose($fh);

It seems like you do not handle an error condition for fclose(). This can introduce security issues, and is generally not recommended.

        $gfh = new CGIFFILEHEADER();
        if (!$gfh->load($data, $len = 0)) {

$len = 0 cannot be passed to CGIFFILEHEADER::load() as the parameter $hdrLen expects a reference.

            return false;
        }

        $width  = $gfh->m_nWidth;
        $height = $gfh->m_nHeight;
        return true;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function getBmp($bgColor)
    {
        $out = '';

        if (!$this->m_bLoaded) {
            return false;
        }

        // PREPARE COLOR TABLE (RGBQUADs)
        if ($this->m_img->m_gih->m_bLocalClr) {
            $nColors = $this->m_img->m_gih->m_nTableSize;
            $rgbq    = $this->m_img->m_gih->m_colorTable->toRGBQuad();
            if ($bgColor != -1) {
                $bgColor = $this->m_img->m_gih->m_colorTable->colorIndex($bgColor);
            }
        } elseif ($this->m_gfh->m_bGlobalClr) {
            $nColors = $this->m_gfh->m_nTableSize;
            $rgbq    = $this->m_gfh->m_colorTable->toRGBQuad();
            if ($bgColor != -1) {
                $bgColor = $this->m_gfh->m_colorTable->colorIndex($bgColor);
            }
        } else {
            $nColors = 0;
            $rgbq    = '';
            $bgColor = -1;
        }

        // PREPARE BITMAP BITS
        $data = $this->m_img->m_data;
        $nPxl = ($this->m_gfh->m_nHeight - 1) * $this->m_gfh->m_nWidth;
        $bmp  = '';
        $nPad = ($this->m_gfh->m_nWidth % 4) ? 4 - ($this->m_gfh->m_nWidth % 4) : 0;
        for ($y = 0; $y < $this->m_gfh->m_nHeight; $y++) {
            for ($x = 0; $x < $this->m_gfh->m_nWidth; $x++, $nPxl++) {
                if (($x >= $this->m_img->m_gih->m_nLeft)
                    && ($y >= $this->m_img->m_gih->m_nTop)
                    && ($x < ($this->m_img->m_gih->m_nLeft + $this->m_img->m_gih->m_nWidth))
                    && ($y < ($this->m_img->m_gih->m_nTop + $this->m_img->m_gih->m_nHeight))) {
                    // PART OF IMAGE
                    if (@$this->m_img->m_bTrans && (ord($data[$nPxl]) == $this->m_img->m_nTrans)) {
                        // TRANSPARENT -> BACKGROUND
                        if ($bgColor == -1) {
                            $bmp .= chr($this->m_gfh->m_nBgColor);
                        } else {
                            $bmp .= chr($bgColor);
                        }
                    } else {
                        $bmp .= $data[$nPxl];
                    }
                } else {
                    // BACKGROUND
                    if ($bgColor == -1) {
                        $bmp .= chr($this->m_gfh->m_nBgColor);
                    } else {
                        $bmp .= chr($bgColor);
                    }
                }
            }
            $nPxl -= $this->m_gfh->m_nWidth << 1;

            // ADD PADDING
            for ($x = 0; $x < $nPad; $x++) {
                $bmp .= "\x00";
            }
        }

        // BITMAPFILEHEADER
        $out .= 'BM';
        $out .= $this->dword(14 + 40 + ($nColors << 2) + strlen($bmp));
        $out .= "\x00\x00";
        $out .= "\x00\x00";
        $out .= $this->dword(14 + 40 + ($nColors << 2));

        // BITMAPINFOHEADER
        $out .= $this->dword(40);
        $out .= $this->dword($this->m_gfh->m_nWidth);
        $out .= $this->dword($this->m_gfh->m_nHeight);
        $out .= "\x01\x00";
        $out .= "\x08\x00";
        $out .= "\x00\x00\x00\x00";
        $out .= "\x00\x00\x00\x00";
        $out .= "\x12\x0B\x00\x00";
        $out .= "\x12\x0B\x00\x00";
        $out .= $this->dword($nColors % 256);
        $out .= "\x00\x00\x00\x00";

        // COLOR TABLE
        if ($nColors > 0) {
            $out .= $rgbq;
        }

        // DATA
        $out .= $bmp;

        return $out;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function getPng($bgColor)
    {
        $out = '';

        if (!$this->m_bLoaded) {
            return false;
        }

        // PREPARE COLOR TABLE (RGBQUADs)
        if ($this->m_img->m_gih->m_bLocalClr) {
            $nColors = $this->m_img->m_gih->m_nTableSize;
            $pal     = $this->m_img->m_gih->m_colorTable->toString();
            if ($bgColor != -1) {
                $bgColor = $this->m_img->m_gih->m_colorTable->colorIndex($bgColor);
            }
        } elseif ($this->m_gfh->m_bGlobalClr) {
            $nColors = $this->m_gfh->m_nTableSize;
            $pal     = $this->m_gfh->m_colorTable->toString();
            if ($bgColor != -1) {
                $bgColor = $this->m_gfh->m_colorTable->colorIndex($bgColor);
            }
        } else {
            $nColors = 0;
            $pal     = '';
            $bgColor = -1;
        }

        // PREPARE BITMAP BITS
        $data = $this->m_img->m_data;
        $nPxl = 0;
        $bmp  = '';
        for ($y = 0; $y < $this->m_gfh->m_nHeight; $y++) {
            $bmp .= "\x00";
            for ($x = 0; $x < $this->m_gfh->m_nWidth; $x++, $nPxl++) {
                if (($x >= $this->m_img->m_gih->m_nLeft)
                    && ($y >= $this->m_img->m_gih->m_nTop)
                    && ($x < ($this->m_img->m_gih->m_nLeft + $this->m_img->m_gih->m_nWidth))
                    && ($y < ($this->m_img->m_gih->m_nTop + $this->m_img->m_gih->m_nHeight))) {
                    // PART OF IMAGE
                    $bmp .= $data[$nPxl];
                } else {
                    // BACKGROUND
                    if ($bgColor == -1) {
                        $bmp .= chr($this->m_gfh->m_nBgColor);
                    } else {
                        $bmp .= chr($bgColor);
                    }
                }
            }
        }
        $bmp = gzcompress($bmp, 9);

        ///////////////////////////////////////////////////////////////////////
        // SIGNATURE
        $out .= "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
        ///////////////////////////////////////////////////////////////////////
        // HEADER
        $out .= "\x00\x00\x00\x0D";
        $tmp = 'IHDR';
        $tmp .= $this->ndword($this->m_gfh->m_nWidth);
        $tmp .= $this->ndword($this->m_gfh->m_nHeight);
        $tmp .= "\x08\x03\x00\x00\x00";
        $out .= $tmp;
        $out .= $this->ndword(crc32($tmp));
        ///////////////////////////////////////////////////////////////////////
        // PALETTE
        if ($nColors > 0) {
            $out .= $this->ndword($nColors * 3);
            $tmp = 'PLTE';
            $tmp .= $pal;
            $out .= $tmp;
            $out .= $this->ndword(crc32($tmp));
        }
        ///////////////////////////////////////////////////////////////////////
        // TRANSPARENCY
        if (@$this->m_img->m_bTrans && ($nColors > 0)) {
            $out .= $this->ndword($nColors);
            $tmp = 'tRNS';
            for ($i = 0; $i < $nColors; $i++) {
                $tmp .= ($i == $this->m_img->m_nTrans) ? "\x00" : "\xFF";
            }
            $out .= $tmp;
            $out .= $this->ndword(crc32($tmp));
        }
        ///////////////////////////////////////////////////////////////////////
        // DATA BITS
        $out .= $this->ndword(strlen($bmp));
        $tmp = 'IDAT';
        $tmp .= $bmp;
        $out .= $tmp;
        $out .= $this->ndword(crc32($tmp));
        ///////////////////////////////////////////////////////////////////////
        // END OF FILE
        $out .= "\x00\x00\x00\x00IEND\xAE\x42\x60\x82";

        return $out;
    }

    ///////////////////////////////////////////////////////////////////////////

    // Added by James Heinrich <info@silisoftware.com> - January 5, 2003

    // Takes raw image data and plots it pixel-by-pixel on a new GD image and returns that
    // It's extremely slow, but the only solution when imagecreatefromstring() fails
    public function getGD_PixelPlotterVersion()
    {
        if (!$this->m_bLoaded) {
            return false;
        }

        // PREPARE COLOR TABLE (RGBQUADs)
        if ($this->m_img->m_gih->m_bLocalClr) {
            $pal = $this->m_img->m_gih->m_colorTable->toString();
        } elseif ($this->m_gfh->m_bGlobalClr) {
            $pal = $this->m_gfh->m_colorTable->toString();
        } else {
            die('No color table available in getGD_PixelPlotterVersion()');

Using exit here is not recommended.

        }

        $PlottingIMG    = imagecreate($this->m_gfh->m_nWidth, $this->m_gfh->m_nHeight);
        $NumColorsInPal = floor(strlen($pal) / 3);
        $ThisImageColor = [];
        for ($i = 0; $i < $NumColorsInPal; $i++) {
            $ThisImageColor[$i] = imagecolorallocate(
                $PlottingIMG,
                ord($pal{($i * 3) + 0}),
                ord($pal{($i * 3) + 1}),
                ord($pal{($i * 3) + 2})
            );
        }

        // PREPARE BITMAP BITS
        $data = $this->m_img->m_data;
        $nPxl = ($this->m_gfh->m_nHeight - 1) * $this->m_gfh->m_nWidth;
        for ($y = 0; $y < $this->m_gfh->m_nHeight; $y++) {
            if (!phpthumb_functions::FunctionIsDisabled('set_time_limit')) {
                set_time_limit(30);
            }
            for ($x = 0; $x < $this->m_gfh->m_nWidth; $x++, $nPxl++) {
                if (($x >= $this->m_img->m_gih->m_nLeft)
                    && ($y >= $this->m_img->m_gih->m_nTop)
                    && ($x < ($this->m_img->m_gih->m_nLeft + $this->m_img->m_gih->m_nWidth))
                    && ($y < ($this->m_img->m_gih->m_nTop + $this->m_img->m_gih->m_nHeight))) {
                    // PART OF IMAGE
                    if (@$this->m_img->m_bTrans && (ord($data[$nPxl]) == $this->m_img->m_nTrans)) {
                        imagesetpixel($PlottingIMG, $x, $this->m_gfh->m_nHeight - $y - 1, $ThisImageColor[$this->m_gfh->m_nBgColor]);
                    } else {
                        imagesetpixel($PlottingIMG, $x, $this->m_gfh->m_nHeight - $y - 1, $ThisImageColor[ord($data[$nPxl])]);
                    }
                } else {
                    // BACKGROUND
                    imagesetpixel($PlottingIMG, $x, $this->m_gfh->m_nHeight - $y - 1, $ThisImageColor[$this->m_gfh->m_nBgColor]);
                }
            }
            $nPxl -= $this->m_gfh->m_nWidth << 1;
        }

        return $PlottingIMG;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function dword($val)
    {
        $val = (int)$val;
        return chr($val & 0xFF) . chr(($val & 0xFF00) >> 8) . chr(($val & 0xFF0000) >> 16) . chr(($val & 0xFF000000) >> 24);
    }

    ///////////////////////////////////////////////////////////////////////////

    public function ndword($val)
    {
        $val = (int)$val;
        return chr(($val & 0xFF000000) >> 24) . chr(($val & 0xFF0000) >> 16) . chr(($val & 0xFF00) >> 8) . chr($val & 0xFF);
    }

    ///////////////////////////////////////////////////////////////////////////

    public function width()
    {
        return $this->m_gfh->m_nWidth;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function height()
    {
        return $this->m_gfh->m_nHeight;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function comment()
    {
        return $this->m_img->m_lpComm;
    }

    ///////////////////////////////////////////////////////////////////////////

    public function loaded()
    {
        return $this->m_bLoaded;
    }
}