Archive for April 2009
Pro-tip: Against infected zombies, a shotgun can be very effective. Flamethrower even more so.
TinyUploads is a new program that shrinks your photos for you and then uploads them online. You can embed those photos on your blog, or alternatively send users to a link directly on TinyUploads.com like this: http://tinyuploads.com/0ci. I’ll also embed the images here:
Updated June 17, 2009
Most JPG files contain EXIF metadata about it. This includes such information as “Date taken”, “Camera make”, “Resolution”, “Exposure”, “Aperture”, and also an image thumbnail.
This library will allow you to quickly parse the EXIF metadata in a JPG file as well as fetch the image thumbnail.
Here is sample usage of the library:
var reader:ExifReader = new ExifReader(); reader.addEventListener(Event.COMPLETE, function (e:Event):void{ // Prints all of the metadata keys parsed. trace(reader.getKeys()); // Prints the date the image was taken. trace(reader.getValue("DateTime")); // Fetches the embedded thumbnail BitmapData, and prints its dimensions. trace(reader.getThumbnailBitmapData().width +'x' + reader.getThumbnailBitmapData().height); }); reader.load(new URLRequest('myimage.jpg'), true);
Here is the library.
// ExifReader.as // Reads and obtains JPG EXIF data. // Project site: http://patrickshyu.com/exif // // SAMPLE USAGE: // var reader:ExifReader = new ExifReader(); // reader.addEventListener(Event.COMPLETE, function (e:Event):void{ // trace(reader.getKeys()); // trace(reader.getValue("DateTime")); // trace(reader.getThumbnailBitmapData().width +'x' + reader.getThumbnailBitmapData().height); // }); // reader.load(new URLRequest('myimage.jpg'), true); package com.patrickshyu { import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.Loader; import flash.display.LoaderInfo; import flash.events.Event; import flash.events.EventDispatcher; import flash.events.ProgressEvent; import flash.net.URLRequest; import flash.net.URLStream; import flash.utils.ByteArray; public class ExifReader extends EventDispatcher { private var m_loadThumbnail:Boolean = false; private var m_urlStream:URLStream = null; private var m_data:ByteArray = new ByteArray(); private var m_exif:Object = new Object; private var m_exifKeys:Array = new Array(); private var m_intel:Boolean=true; private var m_loc:uint=0; private var m_thumbnailData:ByteArray = null; private var m_thumbnailBitmapData:BitmapData=null; private var DATASIZES:Object = new Object; private var TAGS:Object = new Object; public function load(urlReq:URLRequest, loadThumbnail:Boolean = false):void{ m_loadThumbnail = loadThumbnail; m_urlStream = new URLStream(); m_urlStream.addEventListener( ProgressEvent.PROGRESS, dataHandler); m_urlStream.load(urlReq); } public function getKeys():Array{ return m_exifKeys; } public function hasKey(key:String):Boolean{ return m_exif[key] != undefined; } public function getValue(key:String):Object{ if(m_exif[key] == undefined) return null; return m_exif[key]; } public function getThumbnailBitmapData():BitmapData{ return m_thumbnailBitmapData; } public function ExifReader(){ DATASIZES[1] = 1; DATASIZES[2] = 1; DATASIZES[3] = 2; DATASIZES[4] = 4; DATASIZES[5] = 8; DATASIZES[6] = 1; DATASIZES[7] = 1; DATASIZES[8] = 2; DATASIZES[9] = 4; DATASIZES[10] = 8; DATASIZES[11] = 4; DATASIZES[12] = 8; TAGS[0x010e] = 'ImageDescription'; TAGS[0x010f] = 'Make'; TAGS[0X0110] = 'Model'; TAGS[0x0112] = 'Orientation'; TAGS[0x011a] = 'XResolution'; TAGS[0x011b] = 'YResolution'; TAGS[0x0128] = 'ResolutionUnit'; TAGS[0x0131] = 'Software'; TAGS[0x0132] = 'DateTime'; TAGS[0x013e] = 'WhitePoint'; TAGS[0x013f] = 'PrimaryChromaticities'; TAGS[0x0221] = 'YCbCrCoefficients'; TAGS[0x0213] = 'YCbCrPositioning'; TAGS[0x0214] = 'ReferenceBlackWhite'; TAGS[0x8298] = 'Copyright'; TAGS[0x829a] = 'ExposureTime'; TAGS[0x829d] = 'FNumber'; TAGS[0x8822] = 'ExposureProgram'; TAGS[0x8827] = 'IsoSpeedRatings'; TAGS[0x9000] = 'ExifVersion'; TAGS[0x9003] = 'DateTimeOriginal'; TAGS[0x9004] = 'DateTimeDigitized'; TAGS[0x9101] = 'ComponentsConfiguration'; TAGS[0x9102] = 'CompressedBitsPerPixel'; TAGS[0x9201] = 'ShutterSpeedValue'; TAGS[0x9202] = 'ApertureValue'; TAGS[0x9203] = 'BrightnessValue'; TAGS[0x9204] = 'ExposureBiasValue'; TAGS[0x9205] = 'MaxApertureValue'; TAGS[0x9206] = 'SubjectDistance'; TAGS[0x9207] = 'MeteringMode'; TAGS[0x9208] = 'LightSource'; TAGS[0x9209] = 'Flash'; TAGS[0x920a] = 'FocalLength'; TAGS[0x927c] = 'MakerNote'; TAGS[0x9286] = 'UserComment'; TAGS[0x9290] = 'SubsecTime'; TAGS[0x9291] = 'SubsecTimeOriginal'; TAGS[0x9292] = 'SubsecTimeDigitized'; TAGS[0xa000] = 'FlashPixVersion'; TAGS[0xa001] = 'ColorSpace'; TAGS[0xa002] = 'ExifImageWidth'; TAGS[0xa003] = 'ExifImageHeight'; TAGS[0xa004] = 'RelatedSoundFile'; TAGS[0xa005] = 'ExifInteroperabilityOffset'; TAGS[0xa20e] = 'FocalPlaneXResolution'; TAGS[0xa20f] = 'FocalPlaneYResolution'; TAGS[0xa210] = 'FocalPlaneResolutionUnit'; TAGS[0xa215] = 'ExposureIndex'; TAGS[0xa217] = 'SensingMethod'; TAGS[0xa300] = 'FileSource'; TAGS[0xa301] = 'SceneType'; TAGS[0xa302] = 'CFAPattern'; //... add more if you like. //See http://park2.wakwak.com/~tsuruzoh/Computer/Digicams/exif-e.html } private function dataHandler(e:ProgressEvent):void{ //EXIF data in top 64kb of data if(m_urlStream.bytesAvailable >= 64*1024){ m_urlStream.readBytes(m_data, 0, m_urlStream.bytesAvailable); m_urlStream.close(); processData(); } } private function processData():void{ var iter:int=0; //confirm JPG type if(!(m_data.readUnsignedByte()==0xff && m_data.readUnsignedByte()==0xd8)) return stop(); //Locate APP1 MARKER var ff:uint=0; var marker:uint=0; for(iter=0;iter<5;++iter){ //cap iterations ff = m_data.readUnsignedByte(); marker = m_data.readUnsignedByte(); var size:uint = (m_data.readUnsignedByte()<<8) + m_data.readUnsignedByte(); if(marker == 0x00e1) break; else{ for(var x:int=0;x<size-2;++x) m_data.readUnsignedByte(); } } //Confirm APP1 MARKER if(!(ff == 0x00ff && marker==0x00e1)) return stop(); //Confirm EXIF header var i:uint; var exifHeader:Array = [0x45,0x78,0x69,0x66,0x0,0x0]; for(i=0; i<6;i++) {if(exifHeader[i] != m_data.readByte()) return stop();} //Read past TIFF header m_intel = (m_data.readByte()!=0x4d); m_data.readByte(); //redundant for(i=0; i<6;i++) {m_data.readByte();} //read rest of TIFF header //Read IFD data m_loc = 8; readIFD(0); //Read thumbnail if(m_thumbnailData){ var loader:Loader = new Loader(); loader.contentLoaderInfo.addEventListener(Event.COMPLETE, thumbnailLoaded); loader.loadBytes(m_thumbnailData); } else stop(); } //EXIF data is composed of 'IFD' fields. You have IFD0, which is the main picture data. //IFD1 contains thumbnail data. There are also sub-IFDs inside IFDs, notably inside IFD0. //The sub-IFDs will contain a lot of additional EXIF metadata. //readIFD(int) will help read all of these such fields. private function readIFD(ifd:int):void{ var iter:int=0; var jumps:Array = new Array(); var subexifJump:uint=0; var thumbnailAddress:uint=0; var thumbnailSize:int=0; // Read number of entries var numEntries:uint; if(m_intel) numEntries = m_data.readUnsignedByte() + (m_data.readUnsignedByte()<<8); else numEntries = (m_data.readUnsignedByte()<<8) + (m_data.readUnsignedByte()); if(numEntries>100) numEntries=100; //cap entries m_loc+=2; for(iter=0; iter<numEntries;++iter){ //Read tag var tag:uint; if(m_intel) tag = (m_data.readUnsignedByte()) + (m_data.readUnsignedByte()<<8); else tag = (m_data.readUnsignedByte()<<8) + (m_data.readUnsignedByte()); //read type var type:uint; if(m_intel) type = (m_data.readUnsignedByte()+(m_data.readUnsignedByte()<<8)); else type = (m_data.readUnsignedByte()<<8)+(m_data.readUnsignedByte()<<0); //Read # of components var comp:uint; if(m_intel) comp = (m_data.readUnsignedByte()+(m_data.readUnsignedByte()<<8) + (m_data.readUnsignedByte()<<16) + (m_data.readUnsignedByte()<<24)); else comp = (m_data.readUnsignedByte()<<24)+(m_data.readUnsignedByte()<<16) + (m_data.readUnsignedByte()<<8) + (m_data.readUnsignedByte()<<0); //Read data var data:uint; if(m_intel) data= m_data.readUnsignedByte()+(m_data.readUnsignedByte()<<8) + (m_data.readUnsignedByte()<<16) + (m_data.readUnsignedByte()<<24); else data = (m_data.readUnsignedByte()<<24)+(m_data.readUnsignedByte()<<16) + (m_data.readUnsignedByte()<<8) + (m_data.readUnsignedByte()<<0); m_loc+=12; if(tag==0x0201) thumbnailAddress = data; //thumbnail address if(tag==0x0202) thumbnailSize = data; //thumbnail size (in bytes) if(TAGS[tag] != undefined){ //Determine data size if(DATASIZES[type] * comp <= 4){ //data is contained within field m_exif[TAGS[tag]] = data; m_exifKeys.push(TAGS[tag]); } else{ //data is at an offset var jumpT:Object = new Object(); jumpT.name = TAGS[tag]; jumpT.address=data; jumpT.components = comp; jumpT.type = type; jumps.push(jumpT); } } if(tag==0x8769){ // subexif tag subexifJump = data; } } var nextIFD:uint; if(m_intel) nextIFD= m_data.readUnsignedByte()+(m_data.readUnsignedByte()<<8) + (m_data.readUnsignedByte()<<16) + (m_data.readUnsignedByte()<<24); else nextIFD = (m_data.readUnsignedByte()<<24)+(m_data.readUnsignedByte()<<16) + (m_data.readUnsignedByte()<<8) + (m_data.readUnsignedByte()<<0); m_loc+=4; //commenting this out, as suggested in the comments. //if(ifd==0) jumps = new Array(); for each(var jumpTarget:Object in jumps){ var jumpData:Object = null; for(;m_loc<jumpTarget.address;++m_loc)m_data.readByte(); if(jumpTarget.type==5){ //unsigned rational var numerator:uint = m_data.readInt(); var denominator:uint = m_data.readUnsignedInt(); m_loc+=8; jumpData = numerator / denominator; } if(jumpTarget.type==2){ //string var field:String=''; for(var compGather:int=0;compGather<jumpTarget.components;++compGather){ field += String.fromCharCode(m_data.readByte()); ++m_loc; } if(jumpTarget.name=='DateTime' || jumpTarget.name=='DateTimeOriginal' || jumpTarget.name=='DateTimeDigitized'){ var array:Array = field.split(/[: ]/); if(parseInt(array[0]) > 1990){ jumpData = new Date(parseInt(array[0]), parseInt(array[1])-1, parseInt(array[2]), parseInt(array[3]), parseInt(array[4]), parseInt(array[5])); } } else jumpData = field; } m_exif[jumpTarget.name] = jumpData; m_exifKeys.push(jumpTarget.name); } if(ifd==0 && subexifJump){ //jump to subexif area to obtain meta information for(;m_loc<data;++m_loc) m_data.readByte(); readIFD(ifd); } if(ifd==1 && thumbnailAddress && m_loadThumbnail){ //jump to obtain thumbnail for(;m_loc<thumbnailAddress;++m_loc) m_data.readByte(); m_thumbnailData = new ByteArray(); m_data.readBytes(m_thumbnailData, 0, thumbnailSize); return; } // End-of-IFD // read the next IFD if(nextIFD) for(;m_loc<nextIFD;++m_loc) m_data.readUnsignedByte(); if(ifd==0 && nextIFD) readIFD(1); } private function thumbnailLoaded(e:Event):void{ m_thumbnailData.clear(); var loader:LoaderInfo = e.target as LoaderInfo; var bitmap:Bitmap = loader.content as Bitmap; if(bitmap != null){ m_thumbnailBitmapData = bitmap.bitmapData; } stop(); } // Releases m_data and dispatches COMPLETE signal. private function stop():void{ m_data=null; dispatchEvent(new Event(Event.COMPLETE)); return; } } }
Licensing: This library is free to use for non-commerical use. If you are using this for a commercial project, send me some money. Thanks.
