| /* Blob.js |
| * A Blob implementation. |
| * 2013-06-20 |
| * |
| * By Eli Grey, http://eligrey.com |
| * By Devin Samarin, https://github.com/eboyjr |
| * License: X11/MIT |
| * See 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 */ |
| |
| if (typeof Blob !== "function" || typeof URL === "undefined") |
| if (typeof Blob === "function" && typeof webkitURL !== "undefined") var URL = webkitURL; |
| else var Blob = (function (view) { |
| "use strict"; |
| |
| var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || view.MSBlobBuilder || (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 |
| , can_apply_typed_arrays = false |
| , can_apply_typed_arrays_test = function(pass) { |
| can_apply_typed_arrays = !pass; |
| } |
| |
| , ArrayBuffer = view.ArrayBuffer |
| , Uint8Array = view.Uint8Array |
| ; |
| FakeBlob.fake = FB_proto.fake = true; |
| while (file_ex_code--) { |
| FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1; |
| } |
| try { |
| if (Uint8Array) { |
| can_apply_typed_arrays_test.apply(0, new Uint8Array(1)); |
| } |
| } catch (ex) {} |
| if (!real_URL.createObjectURL) { |
| URL = view.URL = {}; |
| } |
| 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)) { |
| if (can_apply_typed_arrays) { |
| bb.push(String.fromCharCode.apply(String, new Uint8Array(data))); |
| } else { |
| var |
| str = "" |
| , buf = new Uint8Array(data) |
| , i = 0 |
| , buf_len = buf.length |
| ; |
| for (; i < buf_len; i++) { |
| str += String.fromCharCode(buf[i]); |
| } |
| } |
| } 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]"; |
| }; |
| return FakeBlobBuilder; |
| }(view)); |
| |
| return function Blob(blobParts, options) { |
| var type = options ? (options.type || "") : ""; |
| var builder = new BlobBuilder(); |
| if (blobParts) { |
| for (var i = 0, len = blobParts.length; i < len; i++) { |
| builder.append(blobParts[i]); |
| } |
| } |
| return builder.getBlob(type); |
| }; |
| }(self)); |