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/* 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 | ||
*/ | ||
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/*global self, unescape */ | ||
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true, | ||
plusplus: true */ | ||
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/*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */ | ||
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(function (view) { | ||
"use strict"; | ||
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view.URL = view.URL || view.webkitURL; | ||
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if (view.Blob && view.URL) { | ||
try { | ||
new Blob; | ||
return; | ||
} catch (e) {} | ||
} | ||
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// 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 | ||
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, ArrayBuffer = view.ArrayBuffer | ||
, Uint8Array = view.Uint8Array | ||
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, 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)); | ||
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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; | ||
}; | ||
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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)); |
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