| /* Blob.js |
| * A Blob implementation. |
| * 2014-07-24 |
| * |
| * By Eli Grey, http://eligrey.com |
| * By Devin Samarin, https://github.com/dsamarin |
| * License: X11/MIT |
| * See https://github.com/eligrey/Blob.js/blob/master/LICENSE.md |
| */ |
| |
| /*global self, unescape */ |
| /*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true, |
| plusplus: true */ |
| |
| /*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */ |
| |
| (function (view) { |
| "use strict"; |
| |
| view.URL = view.URL || view.webkitURL; |
| |
| if (view.Blob && view.URL) { |
| try { |
| new Blob; |
| return; |
| } catch (e) {} |
| } |
| |
| // Internally we use a BlobBuilder implementation to base Blob off of |
| // in order to support older browsers that only have BlobBuilder |
| var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function(view) { |
| var |
| get_class = function(object) { |
| return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1]; |
| } |
| , FakeBlobBuilder = function BlobBuilder() { |
| this.data = []; |
| } |
| , FakeBlob = function Blob(data, type, encoding) { |
| this.data = data; |
| this.size = data.length; |
| this.type = type; |
| this.encoding = encoding; |
| } |
| , FBB_proto = FakeBlobBuilder.prototype |
| , FB_proto = FakeBlob.prototype |
| , FileReaderSync = view.FileReaderSync |
| , FileException = function(type) { |
| this.code = this[this.name = type]; |
| } |
| , file_ex_codes = ( |
| "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR " |
| + "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR" |
| ).split(" ") |
| , file_ex_code = file_ex_codes.length |
| , real_URL = view.URL || view.webkitURL || view |
| , real_create_object_URL = real_URL.createObjectURL |
| , real_revoke_object_URL = real_URL.revokeObjectURL |
| , URL = real_URL |
| , btoa = view.btoa |
| , atob = view.atob |
| |
| , ArrayBuffer = view.ArrayBuffer |
| , Uint8Array = view.Uint8Array |
| |
| , origin = /^[\w-]+:\/*\[?[\w\.:-]+\]?(?::[0-9]+)?/ |
| ; |
| FakeBlob.fake = FB_proto.fake = true; |
| while (file_ex_code--) { |
| FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1; |
| } |
| // Polyfill URL |
| if (!real_URL.createObjectURL) { |
| URL = view.URL = function(uri) { |
| var |
| uri_info = document.createElementNS("http://www.w3.org/1999/xhtml", "a") |
| , uri_origin |
| ; |
| uri_info.href = uri; |
| if (!("origin" in uri_info)) { |
| if (uri_info.protocol.toLowerCase() === "data:") { |
| uri_info.origin = null; |
| } else { |
| uri_origin = uri.match(origin); |
| uri_info.origin = uri_origin && uri_origin[1]; |
| } |
| } |
| return uri_info; |
| }; |
| } |
| URL.createObjectURL = function(blob) { |
| var |
| type = blob.type |
| , data_URI_header |
| ; |
| if (type === null) { |
| type = "application/octet-stream"; |
| } |
| if (blob instanceof FakeBlob) { |
| data_URI_header = "data:" + type; |
| if (blob.encoding === "base64") { |
| return data_URI_header + ";base64," + blob.data; |
| } else if (blob.encoding === "URI") { |
| return data_URI_header + "," + decodeURIComponent(blob.data); |
| } if (btoa) { |
| return data_URI_header + ";base64," + btoa(blob.data); |
| } else { |
| return data_URI_header + "," + encodeURIComponent(blob.data); |
| } |
| } else if (real_create_object_URL) { |
| return real_create_object_URL.call(real_URL, blob); |
| } |
| }; |
| URL.revokeObjectURL = function(object_URL) { |
| if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) { |
| real_revoke_object_URL.call(real_URL, object_URL); |
| } |
| }; |
| FBB_proto.append = function(data/*, endings*/) { |
| var bb = this.data; |
| // decode data to a binary string |
| if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) { |
| var |
| str = "" |
| , buf = new Uint8Array(data) |
| , i = 0 |
| , buf_len = buf.length |
| ; |
| for (; i < buf_len; i++) { |
| str += String.fromCharCode(buf[i]); |
| } |
| bb.push(str); |
| } else if (get_class(data) === "Blob" || get_class(data) === "File") { |
| if (FileReaderSync) { |
| var fr = new FileReaderSync; |
| bb.push(fr.readAsBinaryString(data)); |
| } else { |
| // async FileReader won't work as BlobBuilder is sync |
| throw new FileException("NOT_READABLE_ERR"); |
| } |
| } else if (data instanceof FakeBlob) { |
| if (data.encoding === "base64" && atob) { |
| bb.push(atob(data.data)); |
| } else if (data.encoding === "URI") { |
| bb.push(decodeURIComponent(data.data)); |
| } else if (data.encoding === "raw") { |
| bb.push(data.data); |
| } |
| } else { |
| if (typeof data !== "string") { |
| data += ""; // convert unsupported types to strings |
| } |
| // decode UTF-16 to binary string |
| bb.push(unescape(encodeURIComponent(data))); |
| } |
| }; |
| FBB_proto.getBlob = function(type) { |
| if (!arguments.length) { |
| type = null; |
| } |
| return new FakeBlob(this.data.join(""), type, "raw"); |
| }; |
| FBB_proto.toString = function() { |
| return "[object BlobBuilder]"; |
| }; |
| FB_proto.slice = function(start, end, type) { |
| var args = arguments.length; |
| if (args < 3) { |
| type = null; |
| } |
| return new FakeBlob( |
| this.data.slice(start, args > 1 ? end : this.data.length) |
| , type |
| , this.encoding |
| ); |
| }; |
| FB_proto.toString = function() { |
| return "[object Blob]"; |
| }; |
| FB_proto.close = function() { |
| this.size = 0; |
| delete this.data; |
| }; |
| return FakeBlobBuilder; |
| }(view)); |
| |
| view.Blob = function(blobParts, options) { |
| var type = options ? (options.type || "") : ""; |
| var builder = new BlobBuilder(); |
| if (blobParts) { |
| for (var i = 0, len = blobParts.length; i < len; i++) { |
| if (Uint8Array && blobParts[i] instanceof Uint8Array) { |
| builder.append(blobParts[i].buffer); |
| } |
| else { |
| builder.append(blobParts[i]); |
| } |
| } |
| } |
| var blob = builder.getBlob(type); |
| if (!blob.slice && blob.webkitSlice) { |
| blob.slice = blob.webkitSlice; |
| } |
| return blob; |
| }; |
| |
| var getPrototypeOf = Object.getPrototypeOf || function(object) { |
| return object.__proto__; |
| }; |
| view.Blob.prototype = getPrototypeOf(new view.Blob()); |
| }(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this)); |