--- /dev/null
+/* 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++) {
+ builder.append(blobParts[i]);
+ }
+ }
+ return builder.getBlob(type);
+ };
+}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));
Code Review / policy / engine.git / blobdiff