可以调整gif动画图片尺寸的很实用的php类

类的使用demo：

<?<span php 
</span><span //</span><span http://www.cnblogs.com/roucheng/</span>
<span require_once</span> "roucheng.php"<span ;  
</span><span $gr</span> = <span new</span><span  gifresizer; 
</span><span $gr</span>->temp_dir = "keleyi"<span ; 
</span><span $gr</span>->resize("keleyi.gif","keleyi_resized.gif",500,500<span ); 
</span>?>

类的源代码,保存为roucheng.php文件：

<span   1</span> <? 
<span   2</span>     <span /*</span><span * 
</span><span   3</span> <span     * 
</span><span   4</span> <span     * Resizes Animated GIF Files
</span><span   5</span> <span     *
</span><span   6</span> <span     *   ///IMPORTANT NOTE: The script needs a temporary directory where all the frames should be extracted. 
</span><span   7</span> <span     *   Create a directory with a 777 permission level and write the path into $temp_dir variable below. 
</span><span   8</span> <span     *   
</span><span   9</span> <span     *   Default directory is "frames".
</span><span  10</span>     <span */</span>
<span  11</span>  
<span  12</span>     <span class</span><span  gifresizer {
</span><span  13</span>  
<span  14</span>         <span public</span> <span $temp_dir</span> = "frames"<span ;
</span><span  15</span>         <span private</span> <span $pointer</span> = 0<span ;
</span><span  16</span>         <span private</span> <span $index</span> = 0<span ;
</span><span  17</span>         <span private</span> <span $globaldata</span> = <span array</span><span ();
</span><span  18</span>         <span private</span> <span $imagedata</span> = <span array</span><span ();
</span><span  19</span>         <span private</span> <span $imageinfo</span> = <span array</span><span ();
</span><span  20</span>         <span private</span> <span $handle</span> = 0<span ;
</span><span  21</span>         <span private</span> <span $orgvars</span> = <span array</span><span ();
</span><span  22</span>         <span private</span> <span $encdata</span> = <span array</span><span ();
</span><span  23</span>         <span private</span> <span $parsedfiles</span> = <span array</span><span ();
</span><span  24</span>         <span private</span> <span $originalwidth</span> = 0<span ;
</span><span  25</span>         <span private</span> <span $originalheight</span> = 0<span ;
</span><span  26</span>         <span private</span> <span $wr</span>,<span $hr</span><span ;
</span><span  27</span>         <span private</span> <span $props</span> = <span array</span><span ();
</span><span  28</span>         <span private</span> <span $decoding</span> = <span false</span><span ;
</span><span  29</span>  
<span  30</span>         <span /*</span><span * 
</span><span  31</span> <span         * Public part of the class
</span><span  32</span> <span         * 
</span><span  33</span> <span         * @orgfile - Original file path
</span><span  34</span> <span         * @newfile - New filename with path
</span><span  35</span> <span         * @width   - Desired image width 
</span><span  36</span> <span         * @height  - Desired image height
</span><span  37</span>         <span */</span>
<span  38</span>         <span function</span> resize(<span $orgfile</span>,<span $newfile</span>,<span $width</span>,<span $height</span><span ){
</span><span  39</span>             <span $this</span>->decode(<span $orgfile</span><span );
</span><span  40</span>             <span $this</span>->wr=<span $width</span>/<span $this</span>-><span originalwidth;
</span><span  41</span>             <span $this</span>->hr=<span $height</span>/<span $this</span>-><span originalheight;
</span><span  42</span>             <span $this</span>-><span resizeframes();
</span><span  43</span>             <span $this</span>->encode(<span $newfile</span>,<span $width</span>,<span $height</span><span );
</span><span  44</span>             <span $this</span>-><span clearframes();
</span><span  45</span> <span         }   
</span><span  46</span>  
<span  47</span>         <span /*</span><span * 
</span><span  48</span> <span         * GIF Decoder function.
</span><span  49</span> <span         * Parses the GIF animation into single frames.
</span><span  50</span>         <span */</span>
<span  51</span>         <span private</span> <span function</span> decode(<span $filename</span><span ){
</span><span  52</span>             <span $this</span>->decoding = <span true</span><span ;            
</span><span  53</span>             <span $this</span>-><span clearvariables();
</span><span  54</span>             <span $this</span>->loadfile(<span $filename</span><span );
</span><span  55</span>             <span $this</span>-><span get_gif_header();
</span><span  56</span>             <span $this</span>->get_graphics_extension(0<span );
</span><span  57</span>             <span $this</span>-><span get_application_data();
</span><span  58</span>             <span $this</span>-><span get_application_data();
</span><span  59</span>             <span $this</span>->get_image_block(0<span );
</span><span  60</span>             <span $this</span>->get_graphics_extension(1<span );
</span><span  61</span>             <span $this</span>-><span get_comment_data();
</span><span  62</span>             <span $this</span>-><span get_application_data();
</span><span  63</span>             <span $this</span>->get_image_block(1<span );
</span><span  64</span>             <span while</span>(!<span $this</span>->checkbyte(0x3b) && !<span $this</span>-><span checkEOF()){
</span><span  65</span>                 <span $this</span>->get_comment_data(1<span );
</span><span  66</span>                 <span $this</span>->get_graphics_extension(2<span );
</span><span  67</span>                 <span $this</span>->get_image_block(2<span );
</span><span  68</span> <span             }
</span><span  69</span>             <span $this</span>->writeframes(<span time</span><span ());      
</span><span  70</span>             <span $this</span>-><span closefile();
</span><span  71</span>             <span $this</span>->decoding = <span false</span><span ;
</span><span  72</span> <span         }
</span><span  73</span>  
<span  74</span>         <span /*</span><span * 
</span><span  75</span> <span         * GIF Encoder function.
</span><span  76</span> <span         * Combines the parsed GIF frames into one single animation.
</span><span  77</span>         <span */</span>
<span  78</span>         <span private</span> <span function</span> encode(<span $new_filename</span>,<span $newwidth</span>,<span $newheight</span><span ){
</span><span  79</span>             <span $mystring</span> = ""<span ;
</span><span  80</span>             <span $this</span>->pointer = 0<span ;
</span><span  81</span>             <span $this</span>->imagedata = <span array</span><span ();
</span><span  82</span>             <span $this</span>->imageinfo = <span array</span><span ();
</span><span  83</span>             <span $this</span>->handle = 0<span ;
</span><span  84</span>             <span $this</span>->index=0<span ;
</span><span  85</span>  
<span  86</span>             <span $k</span>=0<span ;
</span><span  87</span>             <span foreach</span>(<span $this</span>->parsedfiles <span as</span> <span $imagepart</span><span ){
</span><span  88</span>                 <span $this</span>->loadfile(<span $imagepart</span><span );
</span><span  89</span>                 <span $this</span>-><span get_gif_header();
</span><span  90</span>                 <span $this</span>-><span get_application_data();
</span><span  91</span>                 <span $this</span>-><span get_comment_data();
</span><span  92</span>                 <span $this</span>->get_graphics_extension(0<span );
</span><span  93</span>                 <span $this</span>->get_image_block(0<span );
</span><span  94</span>  
<span  95</span>                 <span //</span><span get transparent color index and color</span>
<span  96</span>                 <span if</span>(<span isset</span>(<span $this</span>->encdata[<span $this</span>->index-1<span ]))
</span><span  97</span>                     <span $gxdata</span> = <span $this</span>->encdata[<span $this</span>->index-1]["graphicsextension"<span ];
</span><span  98</span>                 <span else</span>
<span  99</span>                     <span $gxdata</span> = <span null</span><span ;
</span><span 100</span>                 <span $ghdata</span> = <span $this</span>->imageinfo["gifheader"<span ];
</span><span 101</span>                 <span $trcolor</span> = ""<span ;
</span><span 102</span>                 <span $hastransparency</span>=(<span $gxdata</span>[3]&&1==1<span );
</span><span 103</span>  
<span 104</span>                 <span if</span>(<span $hastransparency</span><span ){
</span><span 105</span>                     <span $trcx</span> = <span ord</span>(<span $gxdata</span>[6<span ]);
</span><span 106</span>                     <span $trcolor</span> = <span substr</span>(<span $ghdata</span>,13+<span $trcx</span>*3,3<span );
</span><span 107</span> <span                 }
</span><span 108</span>  
<span 109</span>                 <span //</span><span global color table to image data;</span>
<span 110</span>                 <span $this</span>->transfercolortable(<span $this</span>->imageinfo["gifheader"],<span $this</span>->imagedata[<span $this</span>->index-1]["imagedata"<span ]); 
</span><span 111</span>  
<span 112</span>                 <span $imageblock</span> = &<span $this</span>->imagedata[<span $this</span>->index-1]["imagedata"<span ];
</span><span 113</span>  
<span 114</span>                 <span //</span><span if transparency exists transfer transparency index</span>
<span 115</span>                 <span if</span>(<span $hastransparency</span><span ){
</span><span 116</span>                     <span $haslocalcolortable</span> = ((<span ord</span>(<span $imageblock</span>[9])&128)==128<span );
</span><span 117</span>                     <span if</span>(<span $haslocalcolortable</span><span ){
</span><span 118</span>                         <span //</span><span local table exists. determine boundaries and look for it.</span>
<span 119</span>                         <span $tablesize</span>=(<span pow</span>(2,(<span ord</span>(<span $imageblock</span>[9])&7)+1)*3)+10<span ;
</span><span 120</span>                         <span $this</span>->orgvars[<span $this</span>->index-1]["transparent_color_index"] = 
<span 121</span>                         ((<span strrpos</span>(<span substr</span>(<span $this</span>->imagedata[<span $this</span>->index-1]["imagedata"],0,<span $tablesize</span>),<span $trcolor</span>)-10)/3<span );        
</span><span 122</span>                     }<span else</span><span {
</span><span 123</span>                         <span //</span><span local table doesnt exist, look at the global one.</span>
<span 124</span>                         <span $tablesize</span>=(<span pow</span>(2,(<span ord</span>(<span $gxdata</span>[10])&7)+1)*3)+10<span ;
</span><span 125</span>                         <span $this</span>->orgvars[<span $this</span>->index-1]["transparent_color_index"] = 
<span 126</span>                         ((<span strrpos</span>(<span substr</span>(<span $ghdata</span>,0,<span $tablesize</span>),<span $trcolor</span>)-10)/3<span );    
</span><span 127</span> <span                     }               
</span><span 128</span> <span                 }
</span><span 129</span>  
<span 130</span>                 <span //</span><span apply original delay time,transparent index and disposal values to graphics extension</span>
<span 131</span>  
<span 132</span>                 <span if</span>(!<span $this</span>->imagedata[<span $this</span>->index-1]["graphicsextension"]) <span $this</span>->imagedata[<span $this</span>->index-1]["graphicsextension"] = <span chr</span>(0x21).<span chr</span>(0xf9).<span chr</span>(0x04).<span chr</span>(0x00).<span chr</span>(0x00).<span chr</span>(0x00).<span chr</span>(0x00).<span chr</span>(0x00<span );
</span><span 133</span>  
<span 134</span>                 <span $imagedata</span> = &<span $this</span>->imagedata[<span $this</span>->index-1]["graphicsextension"<span ];
</span><span 135</span>  
<span 136</span>                 <span $imagedata</span>[3] = <span chr</span>((<span ord</span>(<span $imagedata</span>[3]) & 0xE3) | (<span $this</span>->orgvars[<span $this</span>->index-1]["disposal_method"] << 2<span ));
</span><span 137</span>                 <span $imagedata</span>[4] = <span chr</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["delay_time"] % 256<span ));
</span><span 138</span>                 <span $imagedata</span>[5] = <span chr</span>(<span floor</span>(<span $this</span>->orgvars[<span $this</span>->index-1]["delay_time"] / 256<span ));
</span><span 139</span>                 <span if</span>(<span $hastransparency</span><span ){
</span><span 140</span>                     <span $imagedata</span>[6] = <span chr</span>(<span $this</span>->orgvars[<span $this</span>->index-1]["transparent_color_index"<span ]);
</span><span 141</span> <span                 }
</span><span 142</span>                 <span $imagedata</span>[3] = <span chr</span>(<span ord</span>(<span $imagedata</span>[3])|<span $hastransparency</span><span );
</span><span 143</span>  
<span 144</span>                 <span //</span><span apply calculated left and top offset </span>
<span 145</span>                 <span $imageblock</span>[1] = <span chr</span>(<span round</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["offset_left"]*<span $this</span>->wr) % 256<span ));
</span><span 146</span>                 <span $imageblock</span>[2] = <span chr</span>(<span floor</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["offset_left"]*<span $this</span>->wr) / 256<span ));
</span><span 147</span>                 <span $imageblock</span>[3] = <span chr</span>(<span round</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["offset_top"]*<span $this</span>->hr) % 256<span ));
</span><span 148</span>                 <span $imageblock</span>[4] = <span chr</span>(<span floor</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["offset_top"]*<span $this</span>->hr) / 256<span ));           
</span><span 149</span>  
<span 150</span>                 <span if</span>(<span $this</span>->index==1<span ){
</span><span 151</span>                     <span if</span>(!<span isset</span>(<span $this</span>->imageinfo["applicationdata"]) || !<span $this</span>->imageinfo["applicationdata"<span ]) 
</span><span 152</span>                         <span $this</span>->imageinfo["applicationdata"]=<span chr</span>(0x21).<span chr</span>(0xff).<span chr</span>(0x0b)."NETSCAPE2.0".<span chr</span>(0x03).<span chr</span>(0x01).<span chr</span>(0x00).<span chr</span>(0x00).<span chr</span>(0x00<span );
</span><span 153</span>                     <span if</span>(!<span isset</span>(<span $this</span>->imageinfo["commentdata"]) || !<span $this</span>->imageinfo["commentdata"<span ])
</span><span 154</span>                         <span $this</span>->imageinfo["commentdata"] = <span chr</span>(0x21).<span chr</span>(0xfe).<span chr</span>(0x10)."PHPGIFRESIZER1.0".<span chr</span>(0<span );
</span><span 155</span>                     <span $mystring</span> .= <span $this</span>->orgvars["gifheader"]. <span $this</span>->imageinfo["applicationdata"].<span $this</span>->imageinfo["commentdata"<span ];
</span><span 156</span>                     <span if</span>(<span isset</span>(<span $this</span>->orgvars["hasgx_type_0"]) && <span $this</span>->orgvars["hasgx_type_0"]) <span $mystring</span> .= <span $this</span>->globaldata["graphicsextension_0"<span ];
</span><span 157</span>                     <span if</span>(<span isset</span>(<span $this</span>->orgvars["hasgx_type_1"]) && <span $this</span>->orgvars["hasgx_type_1"]) <span $mystring</span> .= <span $this</span>->globaldata["graphicsextension"<span ];
</span><span 158</span> <span                 }
</span><span 159</span>  
<span 160</span>                 <span $mystring</span> .= <span $imagedata</span> . <span $imageblock</span><span ;
</span><span 161</span>                 <span $k</span>++<span ;
</span><span 162</span>                 <span $this</span>-><span closefile();
</span><span 163</span> <span             }
</span><span 164</span>  
<span 165</span>             <span $mystring</span> .= <span chr</span>(0x3b<span ); 
</span><span 166</span>  
<span 167</span>             <span //</span><span applying new width & height to gif header</span>
<span 168</span>             <span $mystring</span>[6] = <span chr</span>(<span $newwidth</span> % 256<span );
</span><span 169</span>             <span $mystring</span>[7] = <span chr</span>(<span floor</span>(<span $newwidth</span> / 256<span ));
</span><span 170</span>             <span $mystring</span>[8] = <span chr</span>(<span $newheight</span> % 256<span );
</span><span 171</span>             <span $mystring</span>[9] = <span chr</span>(<span floor</span>(<span $newheight</span> / 256<span ));
</span><span 172</span>             <span $mystring</span>[11]= <span $this</span>->orgvars["background_color"<span ];
</span><span 173</span>             <span //</span><span if(file_exists($new_filename)){unlink($new_filename);}</span>
<span 174</span>             <span file_put_contents</span>(<span $new_filename</span>,<span $mystring</span><span );
</span><span 175</span> <span         }
</span><span 176</span>  
<span 177</span>         <span /*</span><span * 
</span><span 178</span> <span         * Variable Reset function
</span><span 179</span> <span         * If a instance is used multiple times, it's needed. Trust me.
</span><span 180</span>         <span */</span>
<span 181</span>         <span private</span> <span function</span><span  clearvariables(){
</span><span 182</span>             <span $this</span>->pointer = 0<span ;
</span><span 183</span>             <span $this</span>->index = 0<span ;
</span><span 184</span>             <span $this</span>->imagedata = <span array</span><span ();
</span><span 185</span>             <span $this</span>->imageinfo = <span array</span><span ();            
</span><span 186</span>             <span $this</span>->handle = 0<span ;
</span><span 187</span>             <span $this</span>->parsedfiles = <span array</span><span ();
</span><span 188</span> <span         }
</span><span 189</span>  
<span 190</span>         <span /*</span><span * 
</span><span 191</span> <span         * Clear Frames function
</span><span 192</span> <span         * For deleting the frames after encoding.
</span><span 193</span>         <span */</span>
<span 194</span>         <span private</span> <span function</span><span  clearframes(){
</span><span 195</span>             <span foreach</span>(<span $this</span>->parsedfiles <span as</span> <span $temp_frame</span><span ){
</span><span 196</span>                 <span unlink</span>(<span $temp_frame</span><span );
</span><span 197</span> <span             }
</span><span 198</span> <span         }
</span><span 199</span>  
<span 200</span>         <span /*</span><span * 
</span><span 201</span> <span         * Frame Writer
</span><span 202</span> <span         * Writes the GIF frames into files.
</span><span 203</span>         <span */</span>
<span 204</span>         <span private</span> <span function</span> writeframes(<span $prepend</span><span ){
</span><span 205</span>             <span for</span>(<span $i</span>=0;<span $i</span><<span sizeof</span>(<span $this</span>->imagedata);<span $i</span>++<span ){
</span><span 206</span>                 <span file_put_contents</span>(<span $this</span>->temp_dir."/frame_".<span $prepend</span>."_".<span str_pad</span>(<span $i</span>,2,"0",STR_PAD_LEFT).".gif",<span $this</span>->imageinfo["gifheader"].<span $this</span>->imagedata[<span $i</span>]["graphicsextension"].<span $this</span>->imagedata[<span $i</span>]["imagedata"].<span chr</span>(0x3b<span ));
</span><span 207</span>                 <span $this</span>->parsedfiles[]=<span $this</span>->temp_dir."/frame_".<span $prepend</span>."_".<span str_pad</span>(<span $i</span>,2,"0",STR_PAD_LEFT).".gif"<span ;
</span><span 208</span> <span             }
</span><span 209</span> <span         }
</span><span 210</span>  
<span 211</span>         <span /*</span><span * 
</span><span 212</span> <span         * Color Palette Transfer Device
</span><span 213</span> <span         * Transferring Global Color Table (GCT) from frames into Local Color Tables in animation.
</span><span 214</span>         <span */</span>
<span 215</span>         <span private</span> <span function</span> transfercolortable(<span $src</span>,&<span $dst</span><span ){
</span><span 216</span>             <span //</span><span src is gif header,dst is image data block
</span><span 217</span> <span             //if global color table exists,transfer it</span>
<span 218</span>             <span if</span>((<span ord</span>(<span $src</span>[10])&128)==128<span ){
</span><span 219</span>                 <span //</span><span Gif Header Global Color Table Length</span>
<span 220</span>                 <span $ghctl</span> = <span pow</span>(2,<span $this</span>->readbits(<span ord</span>(<span $src</span>[10]),5,3)+1)*3<span ;
</span><span 221</span>                 <span //</span><span cut global color table from gif header</span>
<span 222</span>                 <span $ghgct</span> = <span substr</span>(<span $src</span>,13,<span $ghctl</span><span );
</span><span 223</span>                 <span //</span><span check image block color table length</span>
<span 224</span>                 <span if</span>((<span ord</span>(<span $dst</span>[9])&128)==128<span ){
</span><span 225</span>                     <span //</span><span Image data contains color table. skip.</span>
<span 226</span>                 }<span else</span><span {
</span><span 227</span>                     <span //</span><span Image data needs a color table.
</span><span 228</span> <span                     //get last color table length so we can truncate the dummy color table</span>
<span 229</span>                     <span $idctl</span> = <span pow</span>(2,<span $this</span>->readbits(<span ord</span>(<span $dst</span>[9]),5,3)+1)*3<span ;
</span><span 230</span>                     <span //</span><span set color table flag and length   </span>
<span 231</span>                     <span $dst</span>[9] = <span chr</span>(<span ord</span>(<span $dst</span>[9]) | (0x80 | (<span log</span>(<span $ghctl</span>/3,2)-1<span )));
</span><span 232</span>                     <span //</span><span inject color table</span>
<span 233</span>                     <span $dst</span> = <span substr</span>(<span $dst</span>,0,10).<span $ghgct</span>.<span substr</span>(<span $dst</span>,-1*<span strlen</span>(<span $dst</span>)+10<span );
</span><span 234</span> <span                 }
</span><span 235</span>             }<span else</span><span {
</span><span 236</span>                 <span //</span><span global color table doesn't exist. skip.</span>
<span 237</span> <span             }
</span><span 238</span> <span         }
</span><span 239</span>  
<span 240</span>         <span /*</span><span * 
</span><span 241</span> <span         * GIF Parser Functions.
</span><span 242</span> <span         * Below functions are the main structure parser components.
</span><span 243</span>         <span */</span>
<span 244</span>         <span private</span> <span function</span><span  get_gif_header(){
</span><span 245</span>             <span $this</span>->p_forward(10<span );
</span><span 246</span>             <span if</span>(<span $this</span>->readbits((<span $mybyte</span>=<span $this</span>->readbyte_int()),0,1)==1<span ){
</span><span 247</span>                 <span $this</span>->p_forward(2<span );
</span><span 248</span>                 <span $this</span>->p_forward(<span pow</span>(2,<span $this</span>->readbits(<span $mybyte</span>,5,3)+1)*3<span );
</span><span 249</span>             }<span else</span><span {
</span><span 250</span>                 <span $this</span>->p_forward(2<span );
</span><span 251</span> <span             }
</span><span 252</span>  
<span 253</span>             <span $this</span>->imageinfo["gifheader"]=<span $this</span>->datapart(0,<span $this</span>-><span pointer);
</span><span 254</span>             <span if</span>(<span $this</span>-><span decoding){
</span><span 255</span>                 <span $this</span>->orgvars["gifheader"]=<span $this</span>->imageinfo["gifheader"<span ];
</span><span 256</span>                 <span $this</span>->originalwidth = <span ord</span>(<span $this</span>->orgvars["gifheader"][7])*256+<span ord</span>(<span $this</span>->orgvars["gifheader"][6<span ]);
</span><span 257</span>                 <span $this</span>->originalheight = <span ord</span>(<span $this</span>->orgvars["gifheader"][9])*256+<span ord</span>(<span $this</span>->orgvars["gifheader"][8<span ]);
</span><span 258</span>                 <span $this</span>->orgvars["background_color"]=<span $this</span>->orgvars["gifheader"][11<span ];
</span><span 259</span> <span             }
</span><span 260</span>  
<span 261</span> <span         }
</span><span 262</span>         <span //</span><span -------------------------------------------------------</span>
<span 263</span>         <span private</span> <span function</span><span  get_application_data(){
</span><span 264</span>             <span $startdata</span> = <span $this</span>->readbyte(2<span );
</span><span 265</span>             <span if</span>(<span $startdata</span>==<span chr</span>(0x21).<span chr</span>(0xff<span )){
</span><span 266</span>                 <span $start</span> = <span $this</span>->pointer - 2<span ;
</span><span 267</span>                 <span $this</span>->p_forward(<span $this</span>-><span readbyte_int());
</span><span 268</span>                 <span $this</span>->read_data_stream(<span $this</span>-><span readbyte_int());
</span><span 269</span>                 <span $this</span>->imageinfo["applicationdata"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 270</span>             }<span else</span><span {
</span><span 271</span>                 <span $this</span>->p_rewind(2<span );
</span><span 272</span> <span             }
</span><span 273</span> <span         }
</span><span 274</span>         <span //</span><span -------------------------------------------------------</span>
<span 275</span>         <span private</span> <span function</span><span  get_comment_data(){
</span><span 276</span>             <span $startdata</span> = <span $this</span>->readbyte(2<span );
</span><span 277</span>             <span if</span>(<span $startdata</span>==<span chr</span>(0x21).<span chr</span>(0xfe<span )){
</span><span 278</span>                 <span $start</span> = <span $this</span>->pointer - 2<span ;
</span><span 279</span>                 <span $this</span>->read_data_stream(<span $this</span>-><span readbyte_int());
</span><span 280</span>                 <span $this</span>->imageinfo["commentdata"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 281</span>             }<span else</span><span {
</span><span 282</span>                 <span $this</span>->p_rewind(2<span );
</span><span 283</span> <span             }
</span><span 284</span> <span         }
</span><span 285</span>         <span //</span><span -------------------------------------------------------</span>
<span 286</span>         <span private</span> <span function</span> get_graphics_extension(<span $type</span><span ){
</span><span 287</span>             <span $startdata</span> = <span $this</span>->readbyte(2<span );
</span><span 288</span>             <span if</span>(<span $startdata</span>==<span chr</span>(0x21).<span chr</span>(0xf9<span )){
</span><span 289</span>                 <span $start</span> = <span $this</span>->pointer - 2<span ;
</span><span 290</span>                 <span $this</span>->p_forward(<span $this</span>-><span readbyte_int());
</span><span 291</span>                 <span $this</span>->p_forward(1<span );
</span><span 292</span>                 <span if</span>(<span $type</span>==2<span ){
</span><span 293</span>                     <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 294</span>                 }<span else</span> <span if</span>(<span $type</span>==1<span ){
</span><span 295</span>                     <span $this</span>->orgvars["hasgx_type_1"] = 1<span ;
</span><span 296</span>                     <span $this</span>->globaldata["graphicsextension"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 297</span>                 }<span else</span> <span if</span>(<span $type</span>==0 && <span $this</span>->decoding==<span false</span><span ){
</span><span 298</span>                     <span $this</span>->encdata[<span $this</span>->index]["graphicsextension"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 299</span>                 }<span else</span> <span if</span>(<span $type</span>==0 && <span $this</span>->decoding==<span true</span><span ){
</span><span 300</span>                     <span $this</span>->orgvars["hasgx_type_0"] = 1<span ;
</span><span 301</span>                     <span $this</span>->globaldata["graphicsextension_0"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 302</span> <span                 }
</span><span 303</span>             }<span else</span><span {
</span><span 304</span>                 <span $this</span>->p_rewind(2<span );
</span><span 305</span> <span             }
</span><span 306</span> <span         }
</span><span 307</span>         <span //</span><span -------------------------------------------------------</span>
<span 308</span>         <span private</span> <span function</span> get_image_block(<span $type</span><span ){
</span><span 309</span>             <span if</span>(<span $this</span>->checkbyte(0x2c<span )){
</span><span 310</span>                 <span $start</span> = <span $this</span>-><span pointer;
</span><span 311</span>                 <span $this</span>->p_forward(9<span );
</span><span 312</span>                 <span if</span>(<span $this</span>->readbits((<span $mybyte</span>=<span $this</span>->readbyte_int()),0,1)==1<span ){
</span><span 313</span>                     <span $this</span>->p_forward(<span pow</span>(2,<span $this</span>->readbits(<span $mybyte</span>,5,3)+1)*3<span );
</span><span 314</span> <span                 }
</span><span 315</span>                 <span $this</span>->p_forward(1<span );
</span><span 316</span>                 <span $this</span>->read_data_stream(<span $this</span>-><span readbyte_int());
</span><span 317</span>                 <span $this</span>->imagedata[<span $this</span>->index]["imagedata"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 318</span>  
<span 319</span>                 <span if</span>(<span $type</span>==0<span ){
</span><span 320</span>                     <span $this</span>->orgvars["hasgx_type_0"] = 0<span ;
</span><span 321</span>                     <span if</span>(<span isset</span>(<span $this</span>->globaldata["graphicsextension_0"<span ]))
</span><span 322</span>                         <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"]=<span $this</span>->globaldata["graphicsextension_0"<span ];
</span><span 323</span>                     <span else</span>
<span 324</span>                         <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"]=<span null</span><span ;
</span><span 325</span>                     <span unset</span>(<span $this</span>->globaldata["graphicsextension_0"<span ]);
</span><span 326</span>                 }<span elseif</span>(<span $type</span>==1<span ){
</span><span 327</span>                     <span if</span>(<span isset</span>(<span $this</span>->orgvars["hasgx_type_1"]) && <span $this</span>->orgvars["hasgx_type_1"]==1<span ){
</span><span 328</span>                         <span $this</span>->orgvars["hasgx_type_1"] = 0<span ;
</span><span 329</span>                         <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"]=<span $this</span>->globaldata["graphicsextension"<span ];
</span><span 330</span>                         <span unset</span>(<span $this</span>->globaldata["graphicsextension"<span ]);
</span><span 331</span>                     }<span else</span><span {
</span><span 332</span>                         <span $this</span>->orgvars["hasgx_type_0"] = 0<span ;
</span><span 333</span>                         <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"]=<span $this</span>->globaldata["graphicsextension_0"<span ];
</span><span 334</span>                         <span unset</span>(<span $this</span>->globaldata["graphicsextension_0"<span ]);
</span><span 335</span> <span                     }
</span><span 336</span> <span                 }
</span><span 337</span>  
<span 338</span>                 <span $this</span>-><span parse_image_data();
</span><span 339</span>                 <span $this</span>->index++<span ;
</span><span 340</span>  
<span 341</span> <span             }
</span><span 342</span> <span         }
</span><span 343</span>         <span //</span><span -------------------------------------------------------</span>
<span 344</span>         <span private</span> <span function</span><span  parse_image_data(){
</span><span 345</span>             <span $this</span>->imagedata[<span $this</span>->index]["disposal_method"] = <span $this</span>->get_imagedata_bit("ext",3,3,3<span );
</span><span 346</span>             <span $this</span>->imagedata[<span $this</span>->index]["user_input_flag"] = <span $this</span>->get_imagedata_bit("ext",3,6,1<span );
</span><span 347</span>             <span $this</span>->imagedata[<span $this</span>->index]["transparent_color_flag"] = <span $this</span>->get_imagedata_bit("ext",3,7,1<span );
</span><span 348</span>             <span $this</span>->imagedata[<span $this</span>->index]["delay_time"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("ext",4,2<span ));
</span><span 349</span>             <span $this</span>->imagedata[<span $this</span>->index]["transparent_color_index"] = <span ord</span>(<span $this</span>->get_imagedata_byte("ext",6,1<span ));
</span><span 350</span>             <span $this</span>->imagedata[<span $this</span>->index]["offset_left"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("dat",1,2<span ));
</span><span 351</span>             <span $this</span>->imagedata[<span $this</span>->index]["offset_top"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("dat",3,2<span ));
</span><span 352</span>             <span $this</span>->imagedata[<span $this</span>->index]["width"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("dat",5,2<span ));
</span><span 353</span>             <span $this</span>->imagedata[<span $this</span>->index]["height"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("dat",7,2<span ));
</span><span 354</span>             <span $this</span>->imagedata[<span $this</span>->index]["local_color_table_flag"] = <span $this</span>->get_imagedata_bit("dat",9,0,1<span );
</span><span 355</span>             <span $this</span>->imagedata[<span $this</span>->index]["interlace_flag"] = <span $this</span>->get_imagedata_bit("dat",9,1,1<span );
</span><span 356</span>             <span $this</span>->imagedata[<span $this</span>->index]["sort_flag"] = <span $this</span>->get_imagedata_bit("dat",9,2,1<span );
</span><span 357</span>             <span $this</span>->imagedata[<span $this</span>->index]["color_table_size"] = <span pow</span>(2,<span $this</span>->get_imagedata_bit("dat",9,5,3)+1)*3<span ;
</span><span 358</span>             <span $this</span>->imagedata[<span $this</span>->index]["color_table"] = <span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["imagedata"],10,<span $this</span>->imagedata[<span $this</span>->index]["color_table_size"<span ]);
</span><span 359</span>             <span $this</span>->imagedata[<span $this</span>->index]["lzw_code_size"] = <span ord</span>(<span $this</span>->get_imagedata_byte("dat",10,1<span ));
</span><span 360</span>             <span if</span>(<span $this</span>-><span decoding){
</span><span 361</span>                 <span $this</span>->orgvars[<span $this</span>->index]["transparent_color_flag"] = <span $this</span>->imagedata[<span $this</span>->index]["transparent_color_flag"<span ];
</span><span 362</span>                 <span $this</span>->orgvars[<span $this</span>->index]["transparent_color_index"] = <span $this</span>->imagedata[<span $this</span>->index]["transparent_color_index"<span ];
</span><span 363</span>                 <span $this</span>->orgvars[<span $this</span>->index]["delay_time"] = <span $this</span>->imagedata[<span $this</span>->index]["delay_time"<span ];
</span><span 364</span>                 <span $this</span>->orgvars[<span $this</span>->index]["disposal_method"] = <span $this</span>->imagedata[<span $this</span>->index]["disposal_method"<span ];
</span><span 365</span>                 <span $this</span>->orgvars[<span $this</span>->index]["offset_left"] = <span $this</span>->imagedata[<span $this</span>->index]["offset_left"<span ];
</span><span 366</span>                 <span $this</span>->orgvars[<span $this</span>->index]["offset_top"] = <span $this</span>->imagedata[<span $this</span>->index]["offset_top"<span ];
</span><span 367</span> <span             }
</span><span 368</span> <span         }
</span><span 369</span>         <span //</span><span -------------------------------------------------------</span>
<span 370</span>         <span private</span> <span function</span> get_imagedata_byte(<span $type</span>,<span $start</span>,<span $length</span><span ){
</span><span 371</span>             <span if</span>(<span $type</span>=="ext"<span )
</span><span 372</span>                 <span return</span> <span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"],<span $start</span>,<span $length</span><span );
</span><span 373</span>             <span elseif</span>(<span $type</span>=="dat"<span )
</span><span 374</span>                 <span return</span> <span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["imagedata"],<span $start</span>,<span $length</span><span );
</span><span 375</span> <span         }
</span><span 376</span>         <span //</span><span -------------------------------------------------------</span>
<span 377</span>         <span private</span> <span function</span> get_imagedata_bit(<span $type</span>,<span $byteindex</span>,<span $bitstart</span>,<span $bitlength</span><span ){
</span><span 378</span>             <span if</span>(<span $type</span>=="ext"<span )
</span><span 379</span>                 <span return</span> <span $this</span>->readbits(<span ord</span>(<span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"],<span $byteindex</span>,1)),<span $bitstart</span>,<span $bitlength</span><span );
</span><span 380</span>             <span elseif</span>(<span $type</span>=="dat"<span )
</span><span 381</span>                 <span return</span> <span $this</span>->readbits(<span ord</span>(<span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["imagedata"],<span $byteindex</span>,1)),<span $bitstart</span>,<span $bitlength</span><span );
</span><span 382</span> <span         }
</span><span 383</span>         <span //</span><span -------------------------------------------------------</span>
<span 384</span>         <span private</span> <span function</span> dualbyteval(<span $s</span><span ){
</span><span 385</span>             <span $i</span> = <span ord</span>(<span $s</span>[1])*256 + <span ord</span>(<span $s</span>[0<span ]);
</span><span 386</span>             <span return</span> <span $i</span><span ;
</span><span 387</span> <span         }
</span><span 388</span>         <span //</span><span ------------   Helper Functions ---------------------</span>
<span 389</span>         <span private</span> <span function</span> read_data_stream(<span $first_length</span><span ){
</span><span 390</span>             <span $this</span>->p_forward(<span $first_length</span><span );
</span><span 391</span>             <span $length</span>=<span $this</span>-><span readbyte_int();
</span><span 392</span>             <span if</span>(<span $length</span>!=0<span ) {
</span><span 393</span>                 <span while</span>(<span $length</span>!=0<span ){
</span><span 394</span>                     <span $this</span>->p_forward(<span $length</span><span );
</span><span 395</span>                     <span $length</span>=<span $this</span>-><span readbyte_int();
</span><span 396</span> <span                 }
</span><span 397</span> <span             }
</span><span 398</span>             <span return</span> <span true</span><span ;
</span><span 399</span> <span         }
</span><span 400</span>         <span //</span><span -------------------------------------------------------</span>
<span 401</span>         <span private</span> <span function</span> loadfile(<span $filename</span><span ){
</span><span 402</span>             <span $this</span>->handle = <span fopen</span>(<span $filename</span>,"rb"<span );
</span><span 403</span>             <span $this</span>->pointer = 0<span ;
</span><span 404</span> <span         }
</span><span 405</span>         <span //</span><span -------------------------------------------------------</span>
<span 406</span>         <span private</span> <span function</span><span  closefile(){
</span><span 407</span>             <span fclose</span>(<span $this</span>-><span handle);
</span><span 408</span>             <span $this</span>->handle=0<span ;
</span><span 409</span> <span         }
</span><span 410</span>         <span //</span><span -------------------------------------------------------</span>
<span 411</span>         <span private</span> <span function</span> readbyte(<span $byte_count</span><span ){
</span><span 412</span>             <span $data</span> = <span fread</span>(<span $this</span>->handle,<span $byte_count</span><span );
</span><span 413</span>             <span $this</span>->pointer += <span $byte_count</span><span ;
</span><span 414</span>             <span return</span> <span $data</span><span ;
</span><span 415</span> <span         }
</span><span 416</span>         <span //</span><span -------------------------------------------------------</span>
<span 417</span>         <span private</span> <span function</span><span  readbyte_int(){
</span><span 418</span>             <span $data</span> = <span fread</span>(<span $this</span>->handle,1<span );
</span><span 419</span>             <span $this</span>->pointer++<span ;
</span><span 420</span>             <span return</span> <span ord</span>(<span $data</span><span );
</span><span 421</span> <span         }
</span><span 422</span>         <span //</span><span -------------------------------------------------------</span>
<span 423</span>         <span private</span> <span function</span> readbits(<span $byte</span>,<span $start</span>,<span $length</span><span ){
</span><span 424</span>             <span $bin</span> = <span str_pad</span>(<span decbin</span>(<span $byte</span>),8,"0",<span STR_PAD_LEFT);
</span><span 425</span>             <span $data</span> = <span substr</span>(<span $bin</span>,<span $start</span>,<span $length</span><span );
</span><span 426</span>             <span return</span> <span bindec</span>(<span $data</span><span );
</span><span 427</span> <span         }
</span><span 428</span>         <span //</span><span -------------------------------------------------------</span>
<span 429</span>         <span private</span> <span function</span> p_rewind(<span $length</span><span ){
</span><span 430</span>             <span $this</span>->pointer-=<span $length</span><span ;
</span><span 431</span>             <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 432</span> <span         }
</span><span 433</span>         <span //</span><span -------------------------------------------------------</span>
<span 434</span>         <span private</span> <span function</span> p_forward(<span $length</span><span ){
</span><span 435</span>             <span $this</span>->pointer+=<span $length</span><span ;
</span><span 436</span>             <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 437</span> <span         }
</span><span 438</span>         <span //</span><span -------------------------------------------------------</span>
<span 439</span>         <span private</span> <span function</span> datapart(<span $start</span>,<span $length</span><span ){
</span><span 440</span>             <span fseek</span>(<span $this</span>->handle,<span $start</span><span );
</span><span 441</span>             <span $data</span> = <span fread</span>(<span $this</span>->handle,<span $length</span><span );
</span><span 442</span>             <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 443</span>             <span return</span> <span $data</span><span ;
</span><span 444</span> <span         }
</span><span 445</span>         <span //</span><span -------------------------------------------------------</span>
<span 446</span>         <span private</span> <span function</span> checkbyte(<span $byte</span><span ){
</span><span 447</span>             <span if</span>(<span fgetc</span>(<span $this</span>->handle)==<span chr</span>(<span $byte</span><span )){
</span><span 448</span>                 <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 449</span>                 <span return</span> <span true</span><span ;
</span><span 450</span>             }<span else</span><span {
</span><span 451</span>                 <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 452</span>                 <span return</span> <span false</span><span ;
</span><span 453</span> <span             }
</span><span 454</span> <span         }   
</span><span 455</span>         <span //</span><span -------------------------------------------------------</span>
<span 456</span>         <span private</span> <span function</span><span  checkEOF(){
</span><span 457</span>             <span if</span>(<span fgetc</span>(<span $this</span>->handle)===<span false</span><span ){
</span><span 458</span>                 <span return</span> <span true</span><span ;
</span><span 459</span>             }<span else</span><span {
</span><span 460</span>                 <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 461</span>                 <span return</span> <span false</span><span ;
</span><span 462</span> <span             }
</span><span 463</span> <span         }   
</span><span 464</span>         <span //</span><span -------------------------------------------------------</span>
<span 465</span>         <span /*</span><span * 
</span><span 466</span> <span         * Debug Functions.  keleyi.com
</span><span 467</span> <span         * Parses the GIF animation into single frames.
</span><span 468</span>         <span */</span>
<span 469</span>         <span private</span> <span function</span> debug(<span $string</span><span ){
</span><span 470</span>             <span echo</span> "<pre class="brush:php;toolbar:false">"<span ;
</span><span 471</span>             <span for</span>(<span $i</span>=0;<span $i</span><<span strlen</span>(<span $string</span>);<span $i</span>++<span ){
</span><span 472</span>                 <span echo</span> <span str_pad</span>(<span dechex</span>(<span ord</span>(<span $string</span>[<span $i</span>])),2,"0",STR_PAD_LEFT). " "<span ;
</span><span 473</span> <span             }
</span><span 474</span>             <span echo</span> "

" debuglen(, "

"<span ;
</span><span 479</span>             <span for</span>(<span $i</span>=0;<span $i</span><<span $len</span>;<span $i</span>++<span ){
</span><span 480</span>                 <span echo</span> <span str_pad</span>(<span dechex</span>(<span ord</span>(<span $var</span>[<span $i</span>])),2,"0",STR_PAD_LEFT). " "<span ;
</span><span 481</span> <span             }
</span><span 482</span>             <span echo</span> "

" debugstream( ->debug(->datapart(->pointer, =0 (->parsedfiles = imagecreatefromgif( = ->imagedata[]["width" = ->imagedata[]["height" = ( * -> = ( * -> = imagecreatetruecolor(, = imagecolortransparent( imagealphablending(, imagesavealpha(, imagepalettecopy(, imagefill(,0,0,imagecolortransparent( imagecolortransparent(,imagecolortransparent( imagecopyresized(,,0,0,0,0,,,, imagegif(, imagedestroy( imagedestroy( ++ ?>