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.

<?php
///////////////////////////////////////////////////////////////////////////////////////////////////
// GIF Util - (C) 2003 Yamasoft (S/C)
// http://www.yamasoft.com
// All Rights Reserved
// This file can be frelly 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]) - Requires cjpeg
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////

function gif_loadFile($lpszFileName, $iIndex = 0)
{
	$gif = new CGIF();

	if(!$gif->loadFile($lpszFileName, $iIndex)) {
		return false;
	}

	return $gif;
}

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

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));
	@fFlush($fh);
	@fClose($fh);
	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));
	@fFlush($fh);
	@fClose($fh);
	return true;
}

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

function gif_outputAsJpeg($gif, $lpszFileName, $bgColor = -1)
{
	if(gif_outputAsBmp($gif, "$lpszFileName.bmp", $gbColor)) {
		exec("cjpeg $lpszFileName.bmp >$lpszFileName 2>/dev/null");
		@unLink("$lpszFileName.bmp");

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

			@unLink($lpszFileName);
		}
	}

	return false;
}

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

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

	return true;
}

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

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

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

	// CONSTRUCTOR
	function CGIFLZW()
	{
		$this->MAX_LZW_BITS = 12;
		unSet($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);
	}

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

	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;
	}

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

	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;
	}

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

	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[intval($i / 8)] & (1 << ($i % 8))) != 0) << $j;
		}

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

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

class CGIFCOLORTABLE
{
	var $m_nColors;
	var $m_arColors;

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

	// CONSTRUCTOR
	function CGIFCOLORTABLE()
	{
		unSet($this->m_nColors);
		unSet($this->m_arColors);
	}

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

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

		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;
	}

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

	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;
	}

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

	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;
	}

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

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

		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
{
	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 $m_colorTable;

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

	// CONSTRUCTOR
	function CGIFFILEHEADER()
	{
		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) {
			$this->m_colorTable = new CGIFCOLORTABLE();
			if(!$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 CGIFIMAGEHEADER
{
	var $m_nLeft;
	var $m_nTop;
	var $m_nWidth;
	var $m_nHeight;
	var $m_bLocalClr;
	var $m_bInterlace;
	var $m_bSorted;
	var $m_nTableSize;
	var $m_colorTable;

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

	// CONSTRUCTOR
	function CGIFIMAGEHEADER()
	{
		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);
	}

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

	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));