Created
December 8, 2015 16:10
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/* | |
* Binary Ajax 0.2 | |
* Copyright (c) 2008 Jacob Seidelin, cupboy@gmail.com, http://blog.nihilogic.dk/ | |
* Licensed under the MPL License [http://www.nihilogic.dk/licenses/mpl-license.txt] | |
*/ | |
var BinaryFile = function(data, dataOffset, dataLength) { | |
var dataOffset = dataOffset || 0; | |
var dataLength = 0; | |
this.getRawData = function() { | |
return data; | |
} | |
if (typeof data == "string") { | |
dataLength = dataLength || data.length; | |
this.getByteAt = function(offset) { | |
return data.charCodeAt(offset + dataOffset) & 0xFF; | |
} | |
} else if (typeof data == "unknown") { | |
dataLength = dataLength || IEBinary_getLength(data); | |
this.getByteAt = function(offset) { | |
return IEBinary_getByteAt(data, offset + dataOffset); | |
} | |
} else { | |
} | |
this.getLength = function() { | |
return dataLength; | |
} | |
this.getSByteAt = function(offset) { | |
var byte = this.getByteAt(offset); | |
if (byte > 127) | |
return byte - 256; | |
else | |
return byte; | |
} | |
this.getShortAt = function(offset, bigEndian) { | |
var short = bigEndian ? | |
(this.getByteAt(offset) << 8) + this.getByteAt(offset + 1) | |
: (this.getByteAt(offset + 1) << 8) + this.getByteAt(offset) | |
if (short < 0) short += 65536; | |
return short; | |
} | |
this.getSShortAt = function(offset, bigEndian) { | |
var ushort = this.getShortAt(offset, bigEndian); | |
if (ushort > 32767) | |
return ushort - 65536; | |
else | |
return ushort; | |
} | |
this.getLongAt = function(offset, bigEndian) { | |
var byte1 = this.getByteAt(offset), | |
byte2 = this.getByteAt(offset + 1), | |
byte3 = this.getByteAt(offset + 2), | |
byte4 = this.getByteAt(offset + 3); | |
var long = bigEndian ? | |
(((((byte1 << 8) + byte2) << 8) + byte3) << 8) + byte4 | |
: (((((byte4 << 8) + byte3) << 8) + byte2) << 8) + byte1; | |
if (long < 0) long += 4294967296; | |
return long; | |
} | |
this.getSLongAt = function(offset, bigEndian) { | |
var ulong = this.getLongAt(offset, bigEndian); | |
if (ulong > 2147483647) | |
return ulong - 4294967296; | |
else | |
return ulong; | |
} | |
this.getStringAt = function(offset, length) { | |
var chars = []; | |
for (var i=offset,j=0;i<offset+length;i++,j++) { | |
chars[j] = String.fromCharCode(this.getByteAt(i)); | |
} | |
return chars.join(""); | |
} | |
this.getCharAt = function(offset) { | |
return String.fromCharCode(this.getByteAt(offset)); | |
} | |
this.toBase64 = function() { | |
return window.btoa(data); | |
} | |
this.fromBase64 = function(str) { | |
data = window.atob(str); | |
} | |
} | |
var BinaryAjax = (function() { | |
function createRequest() { | |
var http = null; | |
if (window.XMLHttpRequest) { | |
http = new XMLHttpRequest(); | |
} else if (window.ActiveXObject) { | |
http = new ActiveXObject("Microsoft.XMLHTTP"); | |
} | |
return http; | |
} | |
function getHead(url, callback, error) { | |
var http = createRequest(); | |
if (http) { | |
if (callback) { | |
if (typeof(http.onload) != "undefined") { | |
http.onload = function() { | |
if (http.status == "200") { | |
callback(this); | |
} else { | |
if (error) error(); | |
} | |
http = null; | |
}; | |
} else { | |
http.onreadystatechange = function() { | |
if (http.readyState == 4) { | |
if (http.status == "200") { | |
callback(this); | |
} else { | |
if (error) error(); | |
} | |
http = null; | |
} | |
}; | |
} | |
} | |
http.open("HEAD", url, true); | |
http.send(null); | |
} else { | |
if (error) error(); | |
} | |
} | |
function sendRequest(url, callback, error, range, acceptRanges, fileSize) { | |
var http = createRequest(); | |
if (http) { | |
var dataOffset = 0; | |
if (range && !acceptRanges) { | |
dataOffset = range[0]; | |
} | |
var dataLen = 0; | |
if (range) { | |
dataLen = range[1]-range[0]+1; | |
} | |
if (callback) { | |
if (typeof(http.onload) != "undefined") { | |
http.onload = function() { | |
if (http.status == "200" || http.status == "206" || http.status == "0") { | |
http.binaryResponse = new BinaryFile(http.responseText, dataOffset, dataLen); | |
http.fileSize = fileSize || http.getResponseHeader("Content-Length"); | |
callback(http); | |
} else { | |
if (error) error(); | |
} | |
http = null; | |
}; | |
} else { | |
http.onreadystatechange = function() { | |
if (http.readyState == 4) { | |
if (http.status == "200" || http.status == "206" || http.status == "0") { | |
// IE6 craps if we try to extend the XHR object | |
var res = { | |
status : http.status, | |
// IE needs responseBody, Chrome/Safari needs responseText | |
binaryResponse : new BinaryFile(http.responseBody || http.responseText, dataOffset, dataLen), | |
fileSize : fileSize || http.getResponseHeader("Content-Length") | |
}; | |
callback(res); | |
} else { | |
if (error) error(); | |
} | |
http = null; | |
} | |
}; | |
} | |
} | |
http.open("GET", url, true); | |
if (http.overrideMimeType) http.overrideMimeType('text/plain; charset=x-user-defined'); | |
if (range && acceptRanges) { | |
http.setRequestHeader("Range", "bytes=" + range[0] + "-" + range[1]); | |
} | |
http.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 1970 00:00:00 GMT"); | |
http.send(null); | |
} else { | |
if (error) error(); | |
} | |
} | |
return function(url, callback, error, range) { | |
if (range) { | |
getHead( | |
url, | |
function(http) { | |
var length = parseInt(http.getResponseHeader("Content-Length"),10); | |
var acceptRanges = http.getResponseHeader("Accept-Ranges"); | |
var start, end; | |
start = range[0]; | |
if (range[0] < 0) | |
start += length; | |
end = start + range[1] - 1; | |
sendRequest(url, callback, error, [start, end], (acceptRanges == "bytes"), length); | |
} | |
); | |
} else { | |
sendRequest(url, callback, error); | |
} | |
} | |
}()); | |
document.write( | |
"<script type='text/vbscript'>\r\n" | |
+ "Function IEBinary_getByteAt(strBinary, offset)\r\n" | |
+ " IEBinary_getByteAt = AscB(MidB(strBinary,offset+1,1))\r\n" | |
+ "End Function\r\n" | |
+ "Function IEBinary_getLength(strBinary)\r\n" | |
+ " IEBinary_getLength = LenB(strBinary)\r\n" | |
+ "End Function\r\n" | |
+ "</script>\r\n" | |
); |
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(function() { | |
var debug = false; | |
var root = this; | |
var EXIF = function(obj) { | |
if (obj instanceof EXIF) return obj; | |
if (!(this instanceof EXIF)) return new EXIF(obj); | |
this.EXIFwrapped = obj; | |
}; | |
if (typeof exports !== 'undefined') { | |
if (typeof module !== 'undefined' && module.exports) { | |
exports = module.exports = EXIF; | |
} | |
exports.EXIF = EXIF; | |
} else { | |
root.EXIF = EXIF; | |
} | |
var ExifTags = EXIF.Tags = { | |
// version tags | |
0x9000 : "ExifVersion", // EXIF version | |
0xA000 : "FlashpixVersion", // Flashpix format version | |
// colorspace tags | |
0xA001 : "ColorSpace", // Color space information tag | |
// image configuration | |
0xA002 : "PixelXDimension", // Valid width of meaningful image | |
0xA003 : "PixelYDimension", // Valid height of meaningful image | |
0x9101 : "ComponentsConfiguration", // Information about channels | |
0x9102 : "CompressedBitsPerPixel", // Compressed bits per pixel | |
// user information | |
0x927C : "MakerNote", // Any desired information written by the manufacturer | |
0x9286 : "UserComment", // Comments by user | |
// related file | |
0xA004 : "RelatedSoundFile", // Name of related sound file | |
// date and time | |
0x9003 : "DateTimeOriginal", // Date and time when the original image was generated | |
0x9004 : "DateTimeDigitized", // Date and time when the image was stored digitally | |
0x9290 : "SubsecTime", // Fractions of seconds for DateTime | |
0x9291 : "SubsecTimeOriginal", // Fractions of seconds for DateTimeOriginal | |
0x9292 : "SubsecTimeDigitized", // Fractions of seconds for DateTimeDigitized | |
// picture-taking conditions | |
0x829A : "ExposureTime", // Exposure time (in seconds) | |
0x829D : "FNumber", // F number | |
0x8822 : "ExposureProgram", // Exposure program | |
0x8824 : "SpectralSensitivity", // Spectral sensitivity | |
0x8827 : "ISOSpeedRatings", // ISO speed rating | |
0x8828 : "OECF", // Optoelectric conversion factor | |
0x9201 : "ShutterSpeedValue", // Shutter speed | |
0x9202 : "ApertureValue", // Lens aperture | |
0x9203 : "BrightnessValue", // Value of brightness | |
0x9204 : "ExposureBias", // Exposure bias | |
0x9205 : "MaxApertureValue", // Smallest F number of lens | |
0x9206 : "SubjectDistance", // Distance to subject in meters | |
0x9207 : "MeteringMode", // Metering mode | |
0x9208 : "LightSource", // Kind of light source | |
0x9209 : "Flash", // Flash status | |
0x9214 : "SubjectArea", // Location and area of main subject | |
0x920A : "FocalLength", // Focal length of the lens in mm | |
0xA20B : "FlashEnergy", // Strobe energy in BCPS | |
0xA20C : "SpatialFrequencyResponse", // | |
0xA20E : "FocalPlaneXResolution", // Number of pixels in width direction per FocalPlaneResolutionUnit | |
0xA20F : "FocalPlaneYResolution", // Number of pixels in height direction per FocalPlaneResolutionUnit | |
0xA210 : "FocalPlaneResolutionUnit", // Unit for measuring FocalPlaneXResolution and FocalPlaneYResolution | |
0xA214 : "SubjectLocation", // Location of subject in image | |
0xA215 : "ExposureIndex", // Exposure index selected on camera | |
0xA217 : "SensingMethod", // Image sensor type | |
0xA300 : "FileSource", // Image source (3 == DSC) | |
0xA301 : "SceneType", // Scene type (1 == directly photographed) | |
0xA302 : "CFAPattern", // Color filter array geometric pattern | |
0xA401 : "CustomRendered", // Special processing | |
0xA402 : "ExposureMode", // Exposure mode | |
0xA403 : "WhiteBalance", // 1 = auto white balance, 2 = manual | |
0xA404 : "DigitalZoomRation", // Digital zoom ratio | |
0xA405 : "FocalLengthIn35mmFilm", // Equivalent foacl length assuming 35mm film camera (in mm) | |
0xA406 : "SceneCaptureType", // Type of scene | |
0xA407 : "GainControl", // Degree of overall image gain adjustment | |
0xA408 : "Contrast", // Direction of contrast processing applied by camera | |
0xA409 : "Saturation", // Direction of saturation processing applied by camera | |
0xA40A : "Sharpness", // Direction of sharpness processing applied by camera | |
0xA40B : "DeviceSettingDescription", // | |
0xA40C : "SubjectDistanceRange", // Distance to subject | |
// other tags | |
0xA005 : "InteroperabilityIFDPointer", | |
0xA420 : "ImageUniqueID" // Identifier assigned uniquely to each image | |
}; | |
var TiffTags = EXIF.TiffTags = { | |
0x0100 : "ImageWidth", | |
0x0101 : "ImageHeight", | |
0x8769 : "ExifIFDPointer", | |
0x8825 : "GPSInfoIFDPointer", | |
0xA005 : "InteroperabilityIFDPointer", | |
0x0102 : "BitsPerSample", | |
0x0103 : "Compression", | |
0x0106 : "PhotometricInterpretation", | |
0x0112 : "Orientation", | |
0x0115 : "SamplesPerPixel", | |
0x011C : "PlanarConfiguration", | |
0x0212 : "YCbCrSubSampling", | |
0x0213 : "YCbCrPositioning", | |
0x011A : "XResolution", | |
0x011B : "YResolution", | |
0x0128 : "ResolutionUnit", | |
0x0111 : "StripOffsets", | |
0x0116 : "RowsPerStrip", | |
0x0117 : "StripByteCounts", | |
0x0201 : "JPEGInterchangeFormat", | |
0x0202 : "JPEGInterchangeFormatLength", | |
0x012D : "TransferFunction", | |
0x013E : "WhitePoint", | |
0x013F : "PrimaryChromaticities", | |
0x0211 : "YCbCrCoefficients", | |
0x0214 : "ReferenceBlackWhite", | |
0x0132 : "DateTime", | |
0x010E : "ImageDescription", | |
0x010F : "Make", | |
0x0110 : "Model", | |
0x0131 : "Software", | |
0x013B : "Artist", | |
0x8298 : "Copyright" | |
}; | |
var GPSTags = EXIF.GPSTags = { | |
0x0000 : "GPSVersionID", | |
0x0001 : "GPSLatitudeRef", | |
0x0002 : "GPSLatitude", | |
0x0003 : "GPSLongitudeRef", | |
0x0004 : "GPSLongitude", | |
0x0005 : "GPSAltitudeRef", | |
0x0006 : "GPSAltitude", | |
0x0007 : "GPSTimeStamp", | |
0x0008 : "GPSSatellites", | |
0x0009 : "GPSStatus", | |
0x000A : "GPSMeasureMode", | |
0x000B : "GPSDOP", | |
0x000C : "GPSSpeedRef", | |
0x000D : "GPSSpeed", | |
0x000E : "GPSTrackRef", | |
0x000F : "GPSTrack", | |
0x0010 : "GPSImgDirectionRef", | |
0x0011 : "GPSImgDirection", | |
0x0012 : "GPSMapDatum", | |
0x0013 : "GPSDestLatitudeRef", | |
0x0014 : "GPSDestLatitude", | |
0x0015 : "GPSDestLongitudeRef", | |
0x0016 : "GPSDestLongitude", | |
0x0017 : "GPSDestBearingRef", | |
0x0018 : "GPSDestBearing", | |
0x0019 : "GPSDestDistanceRef", | |
0x001A : "GPSDestDistance", | |
0x001B : "GPSProcessingMethod", | |
0x001C : "GPSAreaInformation", | |
0x001D : "GPSDateStamp", | |
0x001E : "GPSDifferential" | |
}; | |
var StringValues = EXIF.StringValues = { | |
ExposureProgram : { | |
0 : "Not defined", | |
1 : "Manual", | |
2 : "Normal program", | |
3 : "Aperture priority", | |
4 : "Shutter priority", | |
5 : "Creative program", | |
6 : "Action program", | |
7 : "Portrait mode", | |
8 : "Landscape mode" | |
}, | |
MeteringMode : { | |
0 : "Unknown", | |
1 : "Average", | |
2 : "CenterWeightedAverage", | |
3 : "Spot", | |
4 : "MultiSpot", | |
5 : "Pattern", | |
6 : "Partial", | |
255 : "Other" | |
}, | |
LightSource : { | |
0 : "Unknown", | |
1 : "Daylight", | |
2 : "Fluorescent", | |
3 : "Tungsten (incandescent light)", | |
4 : "Flash", | |
9 : "Fine weather", | |
10 : "Cloudy weather", | |
11 : "Shade", | |
12 : "Daylight fluorescent (D 5700 - 7100K)", | |
13 : "Day white fluorescent (N 4600 - 5400K)", | |
14 : "Cool white fluorescent (W 3900 - 4500K)", | |
15 : "White fluorescent (WW 3200 - 3700K)", | |
17 : "Standard light A", | |
18 : "Standard light B", | |
19 : "Standard light C", | |
20 : "D55", | |
21 : "D65", | |
22 : "D75", | |
23 : "D50", | |
24 : "ISO studio tungsten", | |
255 : "Other" | |
}, | |
Flash : { | |
0x0000 : "Flash did not fire", | |
0x0001 : "Flash fired", | |
0x0005 : "Strobe return light not detected", | |
0x0007 : "Strobe return light detected", | |
0x0009 : "Flash fired, compulsory flash mode", | |
0x000D : "Flash fired, compulsory flash mode, return light not detected", | |
0x000F : "Flash fired, compulsory flash mode, return light detected", | |
0x0010 : "Flash did not fire, compulsory flash mode", | |
0x0018 : "Flash did not fire, auto mode", | |
0x0019 : "Flash fired, auto mode", | |
0x001D : "Flash fired, auto mode, return light not detected", | |
0x001F : "Flash fired, auto mode, return light detected", | |
0x0020 : "No flash function", | |
0x0041 : "Flash fired, red-eye reduction mode", | |
0x0045 : "Flash fired, red-eye reduction mode, return light not detected", | |
0x0047 : "Flash fired, red-eye reduction mode, return light detected", | |
0x0049 : "Flash fired, compulsory flash mode, red-eye reduction mode", | |
0x004D : "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected", | |
0x004F : "Flash fired, compulsory flash mode, red-eye reduction mode, return light detected", | |
0x0059 : "Flash fired, auto mode, red-eye reduction mode", | |
0x005D : "Flash fired, auto mode, return light not detected, red-eye reduction mode", | |
0x005F : "Flash fired, auto mode, return light detected, red-eye reduction mode" | |
}, | |
SensingMethod : { | |
1 : "Not defined", | |
2 : "One-chip color area sensor", | |
3 : "Two-chip color area sensor", | |
4 : "Three-chip color area sensor", | |
5 : "Color sequential area sensor", | |
7 : "Trilinear sensor", | |
8 : "Color sequential linear sensor" | |
}, | |
SceneCaptureType : { | |
0 : "Standard", | |
1 : "Landscape", | |
2 : "Portrait", | |
3 : "Night scene" | |
}, | |
SceneType : { | |
1 : "Directly photographed" | |
}, | |
CustomRendered : { | |
0 : "Normal process", | |
1 : "Custom process" | |
}, | |
WhiteBalance : { | |
0 : "Auto white balance", | |
1 : "Manual white balance" | |
}, | |
GainControl : { | |
0 : "None", | |
1 : "Low gain up", | |
2 : "High gain up", | |
3 : "Low gain down", | |
4 : "High gain down" | |
}, | |
Contrast : { | |
0 : "Normal", | |
1 : "Soft", | |
2 : "Hard" | |
}, | |
Saturation : { | |
0 : "Normal", | |
1 : "Low saturation", | |
2 : "High saturation" | |
}, | |
Sharpness : { | |
0 : "Normal", | |
1 : "Soft", | |
2 : "Hard" | |
}, | |
SubjectDistanceRange : { | |
0 : "Unknown", | |
1 : "Macro", | |
2 : "Close view", | |
3 : "Distant view" | |
}, | |
FileSource : { | |
3 : "DSC" | |
}, | |
Components : { | |
0 : "", | |
1 : "Y", | |
2 : "Cb", | |
3 : "Cr", | |
4 : "R", | |
5 : "G", | |
6 : "B" | |
} | |
}; | |
function addEvent(element, event, handler) { | |
if (element.addEventListener) { | |
element.addEventListener(event, handler, false); | |
} else if (element.attachEvent) { | |
element.attachEvent("on" + event, handler); | |
} | |
} | |
function imageHasData(img) { | |
return !!(img.exifdata); | |
} | |
function base64ToArrayBuffer(base64, contentType) { | |
contentType = contentType || base64.match(/^data\:([^\;]+)\;base64,/mi)[1] || ''; // e.g. 'data:image/jpeg;base64,...' => 'image/jpeg' | |
base64 = base64.replace(/^data\:([^\;]+)\;base64,/gmi, ''); | |
var binary = atob(base64); | |
var len = binary.length; | |
var buffer = new ArrayBuffer(len); | |
var view = new Uint8Array(buffer); | |
for (var i = 0; i < len; i++) { | |
view[i] = binary.charCodeAt(i); | |
} | |
return buffer; | |
} | |
function objectURLToBlob(url, callback) { | |
var http = new XMLHttpRequest(); | |
http.open("GET", url, true); | |
http.responseType = "blob"; | |
http.onload = function(e) { | |
if (this.status == 200 || this.status === 0) { | |
callback(this.response); | |
} | |
}; | |
http.send(); | |
} | |
function getImageData(img, callback) { | |
function handleBinaryFile(binFile) { | |
var data = findEXIFinJPEG(binFile); | |
var iptcdata = findIPTCinJPEG(binFile); | |
img.exifdata = data || {}; | |
img.iptcdata = iptcdata || {}; | |
if (callback) { | |
callback.call(img); | |
} | |
} | |
if (img.src) { | |
if (/^data\:/i.test(img.src)) { // Data URI | |
var arrayBuffer = base64ToArrayBuffer(img.src); | |
handleBinaryFile(arrayBuffer); | |
} else if (/^blob\:/i.test(img.src)) { // Object URL | |
var fileReader = new FileReader(); | |
fileReader.onload = function(e) { | |
handleBinaryFile(e.target.result); | |
}; | |
objectURLToBlob(img.src, function (blob) { | |
fileReader.readAsArrayBuffer(blob); | |
}); | |
} else { | |
var http = new XMLHttpRequest(); | |
http.onload = function() { | |
if (this.status == 200 || this.status === 0) { | |
handleBinaryFile(http.response); | |
} else { | |
throw "Could not load image"; | |
} | |
http = null; | |
}; | |
http.open("GET", img.src, true); | |
http.responseType = "arraybuffer"; | |
http.send(null); | |
} | |
} else if (window.FileReader && (img instanceof window.Blob || img instanceof window.File)) { | |
var fileReader = new FileReader(); | |
fileReader.onload = function(e) { | |
if (debug) console.log("Got file of length " + e.target.result.byteLength); | |
handleBinaryFile(e.target.result); | |
}; | |
fileReader.readAsArrayBuffer(img); | |
} | |
} | |
function findEXIFinJPEG(file) { | |
var dataView = new DataView(file); | |
if (debug) console.log("Got file of length " + file.byteLength); | |
if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) { | |
if (debug) console.log("Not a valid JPEG"); | |
return false; // not a valid jpeg | |
} | |
var offset = 2, | |
length = file.byteLength, | |
marker; | |
while (offset < length) { | |
if (dataView.getUint8(offset) != 0xFF) { | |
if (debug) console.log("Not a valid marker at offset " + offset + ", found: " + dataView.getUint8(offset)); | |
return false; // not a valid marker, something is wrong | |
} | |
marker = dataView.getUint8(offset + 1); | |
if (debug) console.log(marker); | |
// we could implement handling for other markers here, | |
// but we're only looking for 0xFFE1 for EXIF data | |
if (marker == 225) { | |
if (debug) console.log("Found 0xFFE1 marker"); | |
return readEXIFData(dataView, offset + 4, dataView.getUint16(offset + 2) - 2); | |
// offset += 2 + file.getShortAt(offset+2, true); | |
} else { | |
offset += 2 + dataView.getUint16(offset+2); | |
} | |
} | |
} | |
function findIPTCinJPEG(file) { | |
var dataView = new DataView(file); | |
if (debug) console.log("Got file of length " + file.byteLength); | |
if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) { | |
if (debug) console.log("Not a valid JPEG"); | |
return false; // not a valid jpeg | |
} | |
var offset = 2, | |
length = file.byteLength; | |
var isFieldSegmentStart = function(dataView, offset){ | |
return ( | |
dataView.getUint8(offset) === 0x38 && | |
dataView.getUint8(offset+1) === 0x42 && | |
dataView.getUint8(offset+2) === 0x49 && | |
dataView.getUint8(offset+3) === 0x4D && | |
dataView.getUint8(offset+4) === 0x04 && | |
dataView.getUint8(offset+5) === 0x04 | |
); | |
}; | |
while (offset < length) { | |
if ( isFieldSegmentStart(dataView, offset )){ | |
// Get the length of the name header (which is padded to an even number of bytes) | |
var nameHeaderLength = dataView.getUint8(offset+7); | |
if(nameHeaderLength % 2 !== 0) nameHeaderLength += 1; | |
// Check for pre photoshop 6 format | |
if(nameHeaderLength === 0) { | |
// Always 4 | |
nameHeaderLength = 4; | |
} | |
var startOffset = offset + 8 + nameHeaderLength; | |
var sectionLength = dataView.getUint16(offset + 6 + nameHeaderLength); | |
return readIPTCData(file, startOffset, sectionLength); | |
break; | |
} | |
// Not the marker, continue searching | |
offset++; | |
} | |
} | |
var IptcFieldMap = { | |
0x78 : 'caption', | |
0x6E : 'credit', | |
0x19 : 'keywords', | |
0x37 : 'dateCreated', | |
0x50 : 'byline', | |
0x55 : 'bylineTitle', | |
0x7A : 'captionWriter', | |
0x69 : 'headline', | |
0x74 : 'copyright', | |
0x0F : 'category' | |
}; | |
function readIPTCData(file, startOffset, sectionLength){ | |
var dataView = new DataView(file); | |
var data = {}; | |
var fieldValue, fieldName, dataSize, segmentType, segmentSize; | |
var segmentStartPos = startOffset; | |
while(segmentStartPos < startOffset+sectionLength) { | |
if(dataView.getUint8(segmentStartPos) === 0x1C && dataView.getUint8(segmentStartPos+1) === 0x02){ | |
segmentType = dataView.getUint8(segmentStartPos+2); | |
if(segmentType in IptcFieldMap) { | |
dataSize = dataView.getInt16(segmentStartPos+3); | |
segmentSize = dataSize + 5; | |
fieldName = IptcFieldMap[segmentType]; | |
fieldValue = getStringFromDB(dataView, segmentStartPos+5, dataSize); | |
// Check if we already stored a value with this name | |
if(data.hasOwnProperty(fieldName)) { | |
// Value already stored with this name, create multivalue field | |
if(data[fieldName] instanceof Array) { | |
data[fieldName].push(fieldValue); | |
} | |
else { | |
data[fieldName] = [data[fieldName], fieldValue]; | |
} | |
} | |
else { | |
data[fieldName] = fieldValue; | |
} | |
} | |
} | |
segmentStartPos++; | |
} | |
return data; | |
} | |
function readTags(file, tiffStart, dirStart, strings, bigEnd) { | |
var entries = file.getUint16(dirStart, !bigEnd), | |
tags = {}, | |
entryOffset, tag, | |
i; | |
for (i=0;i<entries;i++) { | |
entryOffset = dirStart + i*12 + 2; | |
tag = strings[file.getUint16(entryOffset, !bigEnd)]; | |
if (!tag && debug) console.log("Unknown tag: " + file.getUint16(entryOffset, !bigEnd)); | |
tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd); | |
} | |
return tags; | |
} | |
function readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd) { | |
var type = file.getUint16(entryOffset+2, !bigEnd), | |
numValues = file.getUint32(entryOffset+4, !bigEnd), | |
valueOffset = file.getUint32(entryOffset+8, !bigEnd) + tiffStart, | |
offset, | |
vals, val, n, | |
numerator, denominator; | |
switch (type) { | |
case 1: // byte, 8-bit unsigned int | |
case 7: // undefined, 8-bit byte, value depending on field | |
if (numValues == 1) { | |
return file.getUint8(entryOffset + 8, !bigEnd); | |
} else { | |
offset = numValues > 4 ? valueOffset : (entryOffset + 8); | |
vals = []; | |
for (n=0;n<numValues;n++) { | |
vals[n] = file.getUint8(offset + n); | |
} | |
return vals; | |
} | |
case 2: // ascii, 8-bit byte | |
offset = numValues > 4 ? valueOffset : (entryOffset + 8); | |
return getStringFromDB(file, offset, numValues-1); | |
case 3: // short, 16 bit int | |
if (numValues == 1) { | |
return file.getUint16(entryOffset + 8, !bigEnd); | |
} else { | |
offset = numValues > 2 ? valueOffset : (entryOffset + 8); | |
vals = []; | |
for (n=0;n<numValues;n++) { | |
vals[n] = file.getUint16(offset + 2*n, !bigEnd); | |
} | |
return vals; | |
} | |
case 4: // long, 32 bit int | |
if (numValues == 1) { | |
return file.getUint32(entryOffset + 8, !bigEnd); | |
} else { | |
vals = []; | |
for (n=0;n<numValues;n++) { | |
vals[n] = file.getUint32(valueOffset + 4*n, !bigEnd); | |
} | |
return vals; | |
} | |
case 5: // rational = two long values, first is numerator, second is denominator | |
if (numValues == 1) { | |
numerator = file.getUint32(valueOffset, !bigEnd); | |
denominator = file.getUint32(valueOffset+4, !bigEnd); | |
val = new Number(numerator / denominator); | |
val.numerator = numerator; | |
val.denominator = denominator; | |
return val; | |
} else { | |
vals = []; | |
for (n=0;n<numValues;n++) { | |
numerator = file.getUint32(valueOffset + 8*n, !bigEnd); | |
denominator = file.getUint32(valueOffset+4 + 8*n, !bigEnd); | |
vals[n] = new Number(numerator / denominator); | |
vals[n].numerator = numerator; | |
vals[n].denominator = denominator; | |
} | |
return vals; | |
} | |
case 9: // slong, 32 bit signed int | |
if (numValues == 1) { | |
return file.getInt32(entryOffset + 8, !bigEnd); | |
} else { | |
vals = []; | |
for (n=0;n<numValues;n++) { | |
vals[n] = file.getInt32(valueOffset + 4*n, !bigEnd); | |
} | |
return vals; | |
} | |
case 10: // signed rational, two slongs, first is numerator, second is denominator | |
if (numValues == 1) { | |
return file.getInt32(valueOffset, !bigEnd) / file.getInt32(valueOffset+4, !bigEnd); | |
} else { | |
vals = []; | |
for (n=0;n<numValues;n++) { | |
vals[n] = file.getInt32(valueOffset + 8*n, !bigEnd) / file.getInt32(valueOffset+4 + 8*n, !bigEnd); | |
} | |
return vals; | |
} | |
} | |
} | |
function getStringFromDB(buffer, start, length) { | |
var outstr = ""; | |
for (n = start; n < start+length; n++) { | |
outstr += String.fromCharCode(buffer.getUint8(n)); | |
} | |
return outstr; | |
} | |
function readEXIFData(file, start) { | |
if (getStringFromDB(file, start, 4) != "Exif") { | |
if (debug) console.log("Not valid EXIF data! " + getStringFromDB(file, start, 4)); | |
return false; | |
} | |
var bigEnd, | |
tags, tag, | |
exifData, gpsData, | |
tiffOffset = start + 6; | |
// test for TIFF validity and endianness | |
if (file.getUint16(tiffOffset) == 0x4949) { | |
bigEnd = false; | |
} else if (file.getUint16(tiffOffset) == 0x4D4D) { | |
bigEnd = true; | |
} else { | |
if (debug) console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)"); | |
return false; | |
} | |
if (file.getUint16(tiffOffset+2, !bigEnd) != 0x002A) { | |
if (debug) console.log("Not valid TIFF data! (no 0x002A)"); | |
return false; | |
} | |
var firstIFDOffset = file.getUint32(tiffOffset+4, !bigEnd); | |
if (firstIFDOffset < 0x00000008) { | |
if (debug) console.log("Not valid TIFF data! (First offset less than 8)", file.getUint32(tiffOffset+4, !bigEnd)); | |
return false; | |
} | |
tags = readTags(file, tiffOffset, tiffOffset + firstIFDOffset, TiffTags, bigEnd); | |
if (tags.ExifIFDPointer) { | |
exifData = readTags(file, tiffOffset, tiffOffset + tags.ExifIFDPointer, ExifTags, bigEnd); | |
for (tag in exifData) { | |
switch (tag) { | |
case "LightSource" : | |
case "Flash" : | |
case "MeteringMode" : | |
case "ExposureProgram" : | |
case "SensingMethod" : | |
case "SceneCaptureType" : | |
case "SceneType" : | |
case "CustomRendered" : | |
case "WhiteBalance" : | |
case "GainControl" : | |
case "Contrast" : | |
case "Saturation" : | |
case "Sharpness" : | |
case "SubjectDistanceRange" : | |
case "FileSource" : | |
exifData[tag] = StringValues[tag][exifData[tag]]; | |
break; | |
case "ExifVersion" : | |
case "FlashpixVersion" : | |
exifData[tag] = String.fromCharCode(exifData[tag][0], exifData[tag][1], exifData[tag][2], exifData[tag][3]); | |
break; | |
case "ComponentsConfiguration" : | |
exifData[tag] = | |
StringValues.Components[exifData[tag][0]] + | |
StringValues.Components[exifData[tag][1]] + | |
StringValues.Components[exifData[tag][2]] + | |
StringValues.Components[exifData[tag][3]]; | |
break; | |
} | |
tags[tag] = exifData[tag]; | |
} | |
} | |
if (tags.GPSInfoIFDPointer) { | |
gpsData = readTags(file, tiffOffset, tiffOffset + tags.GPSInfoIFDPointer, GPSTags, bigEnd); | |
for (tag in gpsData) { | |
switch (tag) { | |
case "GPSVersionID" : | |
gpsData[tag] = gpsData[tag][0] + | |
"." + gpsData[tag][1] + | |
"." + gpsData[tag][2] + | |
"." + gpsData[tag][3]; | |
break; | |
} | |
tags[tag] = gpsData[tag]; | |
} | |
} | |
return tags; | |
} | |
EXIF.getData = function(img, callback) { | |
if ((img instanceof Image || img instanceof HTMLImageElement) && !img.complete) return false; | |
if (!imageHasData(img)) { | |
getImageData(img, callback); | |
} else { | |
if (callback) { | |
callback.call(img); | |
} | |
} | |
return true; | |
} | |
EXIF.getTag = function(img, tag) { | |
if (!imageHasData(img)) return; | |
return img.exifdata[tag]; | |
} | |
EXIF.getAllTags = function(img) { | |
if (!imageHasData(img)) return {}; | |
var a, | |
data = img.exifdata, | |
tags = {}; | |
for (a in data) { | |
if (data.hasOwnProperty(a)) { | |
tags[a] = data[a]; | |
} | |
} | |
return tags; | |
} | |
EXIF.pretty = function(img) { | |
if (!imageHasData(img)) return ""; | |
var a, | |
data = img.exifdata, | |
strPretty = ""; | |
for (a in data) { | |
if (data.hasOwnProperty(a)) { | |
if (typeof data[a] == "object") { | |
if (data[a] instanceof Number) { | |
strPretty += a + " : " + data[a] + " [" + data[a].numerator + "/" + data[a].denominator + "]\r\n"; | |
} else { | |
strPretty += a + " : [" + data[a].length + " values]\r\n"; | |
} | |
} else { | |
strPretty += a + " : " + data[a] + "\r\n"; | |
} | |
} | |
} | |
return strPretty; | |
} | |
EXIF.readFromBinaryFile = function(file) { | |
return findEXIFinJPEG(file); | |
} | |
if (typeof define === 'function' && define.amd) { | |
define('exif-js', [], function() { | |
return EXIF; | |
}); | |
} | |
}.call(this)); |
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