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Diffstat (limited to 'jsaccess/jsa/js-contrib/Blob.js')
| -rw-r--r-- | jsaccess/jsa/js-contrib/Blob.js | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/jsaccess/jsa/js-contrib/Blob.js b/jsaccess/jsa/js-contrib/Blob.js new file mode 100644 index 0000000..f669f16 --- /dev/null +++ b/jsaccess/jsa/js-contrib/Blob.js @@ -0,0 +1,177 @@ +/* Blob.js + * A Blob implementation. + * 2013-01-23 + * + * 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") +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)); |