gif.php

在综合英文版XOOPS 2.09, 2.091, 2.092 的基础上正式发布XOOPS 2.09中文版 XOOPS 2.09x 版主要是PHP5升级、bug修正和安全补正： 1 全面兼容PHP 5.

		$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;
	}

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

	function w2i($str)
	{
		return ord(substr($str, 0, 1)) + (ord(substr($str, 1, 1)) << 8);
	}
}

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

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

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

	function CGIFIMAGE()
	{
		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();
	}

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

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

			case 0x2C: // Image
				// LOAD HEADER & COLOR TABLE
				if(!$this->m_gih->load($data, $len = 0)) {
					return false;
				}
				$data = substr($data, $len);
				$datLen += $len;

				// ALLOC BUFFER
				if(!($this->m_data = $this->m_lzw->deCompress($data, $len = 0))) {
					return false;
				}
				$data = substr($data, $len);
				$datLen += $len;

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

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

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

	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;
	}

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

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

		// READ FILE
		if(!($fh = @fOpen($lpszFileName, "rb"))) {
		//	return false;
		}
//for local Gif's
//		$this->m_lpData = @fRead($fh, @fileSize($lpszFileName));
//for remote Gif's
		while(!feof($fh)) {
			$this->m_lpData = $this->m_lpData . fread($fh, 1024);
                        //$this->m_lpData = @fRead($fh, @fileSize($lpszFileName));
		}
		fClose($fh);
		// GET FILE HEADER
		if(!$this->m_gfh->load($this->m_lpData, $len = 0)) {
			return false;
		}
		$this->m_lpData = substr($this->m_lpData, $len);

		do {
			if(!$this->m_img->load($this->m_lpData, $imgLen = 0)) {
				return false;
			}
			$this->m_lpData = substr($this->m_lpData, $imgLen);
		}
		while($iIndex-- > 0);

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

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

	function getSize($lpszFileName, &$width, &$height)
	{
		if(!($fh = @fOpen($lpszFileName, "rb"))) {
			return false;
		}
		$data = @fRead($fh, @fileSize($lpszFileName));
		@fClose($fh);

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

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

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

	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);
			}
		}
		else if($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;
			$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;
	}

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

	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);
			}
		}
		else if($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;
			$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;
	}

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

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

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

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

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

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

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

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

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

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

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

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

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

?>