Add load-image-meta.js (needs it for loadImage.parseMetaData method)

Author: umhan35

vendor/assets/javascripts/jquery-fileupload/vendor/load-image-meta.js

@@ -0,0 +1,137 @@
+/*
+ * JavaScript Load Image Meta 1.0.1
+ * https://github.com/blueimp/JavaScript-Load-Image
+ *
+ * Copyright 2013, Sebastian Tschan
+ * https://blueimp.net
+ *
+ * Image meta data handling implementation
+ * based on the help and contribution of
+ * Achim Stöhr.
+ *
+ * Licensed under the MIT license:
+ * http://www.opensource.org/licenses/MIT
+ */
+
+/*jslint continue:true */
+/*global define, window, DataView, Blob, Uint8Array, console */
+
+(function (factory) {
+    'use strict';
+    if (typeof define === 'function' && define.amd) {
+        // Register as an anonymous AMD module:
+        define(['load-image'], factory);
+    } else {
+        // Browser globals:
+        factory(window.loadImage);
+    }
+}(function (loadImage) {
+    'use strict';
+
+    var hasblobSlice = window.Blob && (Blob.prototype.slice ||
+            Blob.prototype.webkitSlice || Blob.prototype.mozSlice);
+
+    loadImage.blobSlice = hasblobSlice && function () {
+        var slice = this.slice || this.webkitSlice || this.mozSlice;
+        return slice.apply(this, arguments);
+    };
+
+    loadImage.metaDataParsers = {
+        jpeg: {
+            0xffe1: [] // APP1 marker
+        }
+    };
+
+    // Parses image meta data and calls the callback with an object argument
+    // with the following properties:
+    // * imageHead: The complete image head as ArrayBuffer (Uint8Array for IE10)
+    // The options arguments accepts an object and supports the following properties:
+    // * maxMetaDataSize: Defines the maximum number of bytes to parse.
+    // * disableImageHead: Disables creating the imageHead property.
+    loadImage.parseMetaData = function (file, callback, options) {
+        options = options || {};
+        var that = this,
+            // 256 KiB should contain all EXIF/ICC/IPTC segments:
+            maxMetaDataSize = options.maxMetaDataSize || 262144,
+            data = {},
+            noMetaData = !(window.DataView  && file && file.size >= 12 &&
+                file.type === 'image/jpeg' && loadImage.blobSlice);
+        if (noMetaData || !loadImage.readFile(
+                loadImage.blobSlice.call(file, 0, maxMetaDataSize),
+                function (e) {
+                    // Note on endianness:
+                    // Since the marker and length bytes in JPEG files are always
+                    // stored in big endian order, we can leave the endian parameter
+                    // of the DataView methods undefined, defaulting to big endian.
+                    var buffer = e.target.result,
+                        dataView = new DataView(buffer),
+                        offset = 2,
+                        maxOffset = dataView.byteLength - 4,
+                        headLength = offset,
+                        markerBytes,
+                        markerLength,
+                        parsers,
+                        i;
+                    // Check for the JPEG marker (0xffd8):
+                    if (dataView.getUint16(0) === 0xffd8) {
+                        while (offset < maxOffset) {
+                            markerBytes = dataView.getUint16(offset);
+                            // Search for APPn (0xffeN) and COM (0xfffe) markers,
+                            // which contain application-specific meta-data like
+                            // Exif, ICC and IPTC data and text comments:
+                            if ((markerBytes >= 0xffe0 && markerBytes <= 0xffef) ||
+                                    markerBytes === 0xfffe) {
+                                // The marker bytes (2) are always followed by
+                                // the length bytes (2), indicating the length of the
+                                // marker segment, which includes the length bytes,
+                                // but not the marker bytes, so we add 2:
+                                markerLength = dataView.getUint16(offset + 2) + 2;
+                                if (offset + markerLength > dataView.byteLength) {
+                                    console.log('Invalid meta data: Invalid segment size.');
+                                    break;
+                                }
+                                parsers = loadImage.metaDataParsers.jpeg[markerBytes];
+                                if (parsers) {
+                                    for (i = 0; i < parsers.length; i += 1) {
+                                        parsers[i].call(
+                                            that,
+                                            dataView,
+                                            offset,
+                                            markerLength,
+                                            data,
+                                            options
+                                        );
+                                    }
+                                }
+                                offset += markerLength;
+                                headLength = offset;
+                            } else {
+                                // Not an APPn or COM marker, probably safe to
+                                // assume that this is the end of the meta data
+                                break;
+                            }
+                        }
+                        // Meta length must be longer than JPEG marker (2)
+                        // plus APPn marker (2), followed by length bytes (2):
+                        if (!options.disableImageHead && headLength > 6) {
+                            if (buffer.slice) {
+                                data.imageHead = buffer.slice(0, headLength);
+                            } else {
+                                // Workaround for IE10, which does not yet
+                                // support ArrayBuffer.slice:
+                                data.imageHead = new Uint8Array(buffer)
+                                    .subarray(0, headLength);
+                            }
+                        }
+                    } else {
+                        console.log('Invalid JPEG file: Missing JPEG marker.');
+                    }
+                    callback(data);
+                },
+                'readAsArrayBuffer'
+            )) {
+            callback(data);
+        }
+    };
+
+}));