Blob.js

/* eslint-disable */ /* Blob.js  * A Blob implementation.  * 2014-05-27  *  * 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 */
(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                 ;             FakeBlob.fake = FB_proto.fake = true;             while (file_ex_code--) {                 FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;             }             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)) {                     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 = this.data.length = 0;             };             return FakeBlobBuilder;         }(view));
    view.Blob = 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);     }; }(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));
上一篇:2021-10-25②LVS 负载均衡集群企业级应用实战、LVS/DR 模式、LVS-NAT模式


下一篇:12-1运算符重载