169 lines
7.8 KiB
JavaScript
169 lines
7.8 KiB
JavaScript
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/* Blob.js
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* A Blob implementation.
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* 2013-06-20
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*
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* By Eli Grey, http://eligrey.com
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* By Devin Samarin, https://github.com/eboyjr
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* License: X11/MIT
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* See LICENSE.md
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*/
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/*global self, unescape */
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/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
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plusplus: true */
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/*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */
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if (typeof Blob !== "function" || typeof URL === "undefined")
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if (typeof Blob === "function" && typeof webkitURL !== "undefined") self.URL = webkitURL;
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else var Blob = (function (view) {
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"use strict";
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var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || view.MSBlobBuilder || (function(view) {
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var
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get_class = function(object) {
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return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1];
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}
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, FakeBlobBuilder = function BlobBuilder() {
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this.data = [];
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}
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, FakeBlob = function Blob(data, type, encoding) {
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this.data = data;
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this.size = data.length;
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this.type = type;
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this.encoding = encoding;
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}
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, FBB_proto = FakeBlobBuilder.prototype
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, FB_proto = FakeBlob.prototype
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, FileReaderSync = view.FileReaderSync
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, FileException = function(type) {
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this.code = this[this.name = type];
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}
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, file_ex_codes = (
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"NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR "
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+ "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
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).split(" ")
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, file_ex_code = file_ex_codes.length
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, real_URL = view.URL || view.webkitURL || view
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, real_create_object_URL = real_URL.createObjectURL
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, real_revoke_object_URL = real_URL.revokeObjectURL
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, URL = real_URL
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, btoa = view.btoa
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, atob = view.atob
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, ArrayBuffer = view.ArrayBuffer
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, Uint8Array = view.Uint8Array
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;
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FakeBlob.fake = FB_proto.fake = true;
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while (file_ex_code--) {
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FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
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}
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if (!real_URL.createObjectURL) {
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URL = view.URL = {};
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}
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URL.createObjectURL = function(blob) {
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var
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type = blob.type
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, data_URI_header
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;
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if (type === null) {
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type = "application/octet-stream";
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}
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if (blob instanceof FakeBlob) {
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data_URI_header = "data:" + type;
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if (blob.encoding === "base64") {
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return data_URI_header + ";base64," + blob.data;
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} else if (blob.encoding === "URI") {
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return data_URI_header + "," + decodeURIComponent(blob.data);
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} if (btoa) {
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return data_URI_header + ";base64," + btoa(blob.data);
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} else {
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return data_URI_header + "," + encodeURIComponent(blob.data);
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}
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} else if (real_create_object_URL) {
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return real_create_object_URL.call(real_URL, blob);
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}
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};
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URL.revokeObjectURL = function(object_URL) {
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if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
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real_revoke_object_URL.call(real_URL, object_URL);
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}
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};
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FBB_proto.append = function(data/*, endings*/) {
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var bb = this.data;
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// decode data to a binary string
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if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) {
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var
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str = ""
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, buf = new Uint8Array(data)
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, i = 0
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, buf_len = buf.length
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;
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for (; i < buf_len; i++) {
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str += String.fromCharCode(buf[i]);
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}
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bb.push(str);
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} else if (get_class(data) === "Blob" || get_class(data) === "File") {
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if (FileReaderSync) {
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var fr = new FileReaderSync;
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bb.push(fr.readAsBinaryString(data));
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} else {
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// async FileReader won't work as BlobBuilder is sync
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throw new FileException("NOT_READABLE_ERR");
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}
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} else if (data instanceof FakeBlob) {
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if (data.encoding === "base64" && atob) {
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bb.push(atob(data.data));
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} else if (data.encoding === "URI") {
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bb.push(decodeURIComponent(data.data));
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} else if (data.encoding === "raw") {
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bb.push(data.data);
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}
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} else {
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if (typeof data !== "string") {
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data += ""; // convert unsupported types to strings
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}
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// decode UTF-16 to binary string
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bb.push(unescape(encodeURIComponent(data)));
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}
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};
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FBB_proto.getBlob = function(type) {
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if (!arguments.length) {
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type = null;
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}
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return new FakeBlob(this.data.join(""), type, "raw");
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};
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FBB_proto.toString = function() {
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return "[object BlobBuilder]";
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};
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FB_proto.slice = function(start, end, type) {
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var args = arguments.length;
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if (args < 3) {
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type = null;
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}
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return new FakeBlob(
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this.data.slice(start, args > 1 ? end : this.data.length)
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, type
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, this.encoding
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);
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};
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FB_proto.toString = function() {
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return "[object Blob]";
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};
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return FakeBlobBuilder;
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}(view));
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return function Blob(blobParts, options) {
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var type = options ? (options.type || "") : "";
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var builder = new BlobBuilder();
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if (blobParts) {
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for (var i = 0, len = blobParts.length; i < len; i++) {
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builder.append(blobParts[i]);
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}
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}
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return builder.getBlob(type);
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};
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}(self));
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/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
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var saveAs=saveAs||(navigator.msSaveOrOpenBlob&&navigator.msSaveOrOpenBlob.bind(navigator))||(function(h){"use strict";var r=h.document,l=function(){return h.URL||h.webkitURL||h},e=h.URL||h.webkitURL||h,n=r.createElementNS("http://www.w3.org/1999/xhtml","a"),g=!h.externalHost&&"download" in n,j=function(t){var s=r.createEvent("MouseEvents");s.initMouseEvent("click",true,false,h,0,0,0,0,0,false,false,false,false,0,null);t.dispatchEvent(s)},o=h.webkitRequestFileSystem,p=h.requestFileSystem||o||h.mozRequestFileSystem,m=function(s){(h.setImmediate||h.setTimeout)(function(){throw s},0)},c="application/octet-stream",k=0,b=[],i=function(){var t=b.length;while(t--){var s=b[t];if(typeof s==="string"){e.revokeObjectURL(s)}else{s.remove()}}b.length=0},q=function(t,s,w){s=[].concat(s);var v=s.length;while(v--){var x=t["on"+s[v]];if(typeof x==="function"){try{x.call(t,w||t)}catch(u){m(u)}}}},f=function(t,u){var v=this,B=t.type,E=false,x,w,s=function(){var F=l().createObjectURL(t);b.push(F);return F},A=function(){q(v,"writestart progress write writeend".split(" "))},D=function(){if(E||!x){x=s(t)}if(w){w.location.href=x}else{window.open(x,"_blank")}v.readyState=v.DONE;A()},z=function(F){return function(){if(v.readyState!==v.DONE){return F.apply(this,arguments)}}},y={create:true,exclusive:false},C;v.readyState=v.INIT;if(!u){u="download"}if(g){x=s(t);n.href=x;n.download=u;j(n);v.readyState=v.DONE;A();return}if(h.chrome&&B&&B!==c){C=t.slice||t.webkitSlice;t=C.call(t,0,t.size,c);E=true}if(o&&u!=="download"){u+=".download"}if(B===c||o){w=h}if(!p){D();return}k+=t.size;p(h.TEMPORARY,k,z(function(F){F.root.getDirectory("saved",y,z(function(G){var H=function(){G.getFile(u,y,z(function(I){I.createWriter(z(function(J){J.onwriteend=function(K){w.location.href=I.toURL();b.push(I);v.readyState=v.DONE;q(v,"writeend",K)};J.onerror=function(){var K=J.error;if(K.code!==K.ABORT_ERR){D()}};"writestart progress write abort".split(" ").forEach(function(K){J["on"+K]=v["on"+K]});J.write(t);v.abort=function(){J.abort();v.readyState=v.DONE};v.readyState=v.WRITING}),D)}),D)};G.getFile(u,{create:false},z(function(I){I.remove();H()}),z(function(I){if(I.code===I.NOT_FOUND_ERR){H()}else{D()}}))}),D)}),D)},d=f.prototype,a=function(s,t){return new f(s,t)};d.abort=function(){var s=this;s.readyState=s.DONE;q(s,"abort")};d.readyState=d.INIT=0;d.WRITING=1;d.DONE=2;d.error=d.onwritestart=d.onprogress=d.onwrite=d.onabort=d.onerror=d.onwriteend=null;h.addEventListener("unload",i,false);return a}(self));
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