WebSVN – f9daq – Blame – //belle2/masterclass/js/Blob.js

Rev	Author	Line No.	Line
193	f9daq	1	/* Blob.js
		2	* A Blob implementation.
		3	* 2014-07-24
		4	*
		5	* By Eli Grey, http://eligrey.com
		6	* By Devin Samarin, https://github.com/dsamarin
		7	* License: MIT
		8	* See https://github.com/eligrey/Blob.js/blob/master/LICENSE.md
		9	*/
		10
		11	/global self, unescape /
		12	/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
		13	plusplus: true */
		14
		15	/! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js /
		16
		17	(function (view) {
		18	"use strict";
		19
		20	view.URL = view.URL \|\| view.webkitURL;
		21
		22	if (view.Blob && view.URL) {
		23	try {
		24	new Blob;
		25	return;
		26	} catch (e) {}
		27	}
		28
		29	// Internally we use a BlobBuilder implementation to base Blob off of
		30	// in order to support older browsers that only have BlobBuilder
		31	var BlobBuilder = view.BlobBuilder \|\| view.WebKitBlobBuilder \|\| view.MozBlobBuilder \|\| (function(view) {
		32	var
		33	get_class = function(object) {
		34	return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1];
		35	}
		36	, FakeBlobBuilder = function BlobBuilder() {
		37	this.data = [];
		38	}
		39	, FakeBlob = function Blob(data, type, encoding) {
		40	this.data = data;
		41	this.size = data.length;
		42	this.type = type;
		43	this.encoding = encoding;
		44	}
		45	, FBB_proto = FakeBlobBuilder.prototype
		46	, FB_proto = FakeBlob.prototype
		47	, FileReaderSync = view.FileReaderSync
		48	, FileException = function(type) {
		49	this.code = this[this.name = type];
		50	}
		51	, file_ex_codes = (
		52	"NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR "
		53	+ "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
		54	).split(" ")
		55	, file_ex_code = file_ex_codes.length
		56	, real_URL = view.URL \|\| view.webkitURL \|\| view
		57	, real_create_object_URL = real_URL.createObjectURL
		58	, real_revoke_object_URL = real_URL.revokeObjectURL
		59	, URL = real_URL
		60	, btoa = view.btoa
		61	, atob = view.atob
		62
		63	, ArrayBuffer = view.ArrayBuffer
		64	, Uint8Array = view.Uint8Array
		65
		66	, origin = /^[\w-]+:\/*\[?[\w\.:-]+\]?(?::[0-9]+)?/
		67	;
		68	FakeBlob.fake = FB_proto.fake = true;
		69	while (file_ex_code--) {
		70	FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
		71	}
		72	// Polyfill URL
		73	if (!real_URL.createObjectURL) {
		74	URL = view.URL = function(uri) {
		75	var
		76	uri_info = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
		77	, uri_origin
		78	;
		79	uri_info.href = uri;
		80	if (!("origin" in uri_info)) {
		81	if (uri_info.protocol.toLowerCase() === "data:") {
		82	uri_info.origin = null;
		83	} else {
		84	uri_origin = uri.match(origin);
		85	uri_info.origin = uri_origin && uri_origin[1];
		86	}
		87	}
		88	return uri_info;
		89	};
		90	}
		91	URL.createObjectURL = function(blob) {
		92	var
		93	type = blob.type
		94	, data_URI_header
		95	;
		96	if (type === null) {
		97	type = "application/octet-stream";
		98	}
		99	if (blob instanceof FakeBlob) {
		100	data_URI_header = "data:" + type;
		101	if (blob.encoding === "base64") {
		102	return data_URI_header + ";base64," + blob.data;
		103	} else if (blob.encoding === "URI") {
		104	return data_URI_header + "," + decodeURIComponent(blob.data);
		105	} if (btoa) {
		106	return data_URI_header + ";base64," + btoa(blob.data);
		107	} else {
		108	return data_URI_header + "," + encodeURIComponent(blob.data);
		109	}
		110	} else if (real_create_object_URL) {
		111	return real_create_object_URL.call(real_URL, blob);
		112	}
		113	};
		114	URL.revokeObjectURL = function(object_URL) {
		115	if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
		116	real_revoke_object_URL.call(real_URL, object_URL);
		117	}
		118	};
		119	FBB_proto.append = function(data/, endings/) {
		120	var bb = this.data;
		121	// decode data to a binary string
		122	if (Uint8Array && (data instanceof ArrayBuffer \|\| data instanceof Uint8Array)) {
		123	var
		124	str = ""
		125	, buf = new Uint8Array(data)
		126	, i = 0
		127	, buf_len = buf.length
		128	;
		129	for (; i < buf_len; i++) {
		130	str += String.fromCharCode(buf[i]);
		131	}
		132	bb.push(str);
		133	} else if (get_class(data) === "Blob" \|\| get_class(data) === "File") {
		134	if (FileReaderSync) {
		135	var fr = new FileReaderSync;
		136	bb.push(fr.readAsBinaryString(data));
		137	} else {
		138	// async FileReader won't work as BlobBuilder is sync
		139	throw new FileException("NOT_READABLE_ERR");
		140	}
		141	} else if (data instanceof FakeBlob) {
		142	if (data.encoding === "base64" && atob) {
		143	bb.push(atob(data.data));
		144	} else if (data.encoding === "URI") {
		145	bb.push(decodeURIComponent(data.data));
		146	} else if (data.encoding === "raw") {
		147	bb.push(data.data);
		148	}
		149	} else {
		150	if (typeof data !== "string") {
		151	data += ""; // convert unsupported types to strings
		152	}
		153	// decode UTF-16 to binary string
		154	bb.push(unescape(encodeURIComponent(data)));
		155	}
		156	};
		157	FBB_proto.getBlob = function(type) {
		158	if (!arguments.length) {
		159	type = null;
		160	}
		161	return new FakeBlob(this.data.join(""), type, "raw");
		162	};
		163	FBB_proto.toString = function() {
		164	return "[object BlobBuilder]";
		165	};
		166	FB_proto.slice = function(start, end, type) {
		167	var args = arguments.length;
		168	if (args < 3) {
		169	type = null;
		170	}
		171	return new FakeBlob(
		172	this.data.slice(start, args > 1 ? end : this.data.length)
		173	, type
		174	, this.encoding
		175	);
		176	};
		177	FB_proto.toString = function() {
		178	return "[object Blob]";
		179	};
		180	FB_proto.close = function() {
		181	this.size = 0;
		182	delete this.data;
		183	};
		184	return FakeBlobBuilder;
		185	}(view));
		186
		187	view.Blob = function(blobParts, options) {
		188	var type = options ? (options.type \|\| "") : "";
		189	var builder = new BlobBuilder();
		190	if (blobParts) {
		191	for (var i = 0, len = blobParts.length; i < len; i++) {
		192	if (Uint8Array && blobParts[i] instanceof Uint8Array) {
		193	builder.append(blobParts[i].buffer);
		194	}
		195	else {
		196	builder.append(blobParts[i]);
		197	}
		198	}
		199	}
		200	var blob = builder.getBlob(type);
		201	if (!blob.slice && blob.webkitSlice) {
		202	blob.slice = blob.webkitSlice;
		203	}
		204	return blob;
		205	};
		206
		207	var getPrototypeOf = Object.getPrototypeOf \|\| function(object) {
		208	return object.__proto__;
		209	};
		210	view.Blob.prototype = getPrototypeOf(new view.Blob());
		211	}(typeof self !== "undefined" && self \|\| typeof window !== "undefined" && window \|\| this.content \|\| this));

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