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File: vendors/jszip/lib/utils.js

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File: vendors/jszip/lib/utils.js
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Class: Gentelella BladeOne
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'use strict'; var support = require('./support'); var compressions = require('./compressions'); var nodeBuffer = require('./nodeBuffer'); /** * Convert a string to a "binary string" : a string containing only char codes between 0 and 255. * @param {string} str the string to transform. * @return {String} the binary string. */ exports.string2binary = function(str) { var result = ""; for (var i = 0; i < str.length; i++) { result += String.fromCharCode(str.charCodeAt(i) & 0xff); } return result; }; exports.arrayBuffer2Blob = function(buffer, mimeType) { exports.checkSupport("blob"); mimeType = mimeType || 'application/zip'; try { // Blob constructor return new Blob([buffer], { type: mimeType }); } catch (e) { try { // deprecated, browser only, old way var Builder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder; var builder = new Builder(); builder.append(buffer); return builder.getBlob(mimeType); } catch (e) { // well, fuck ?! throw new Error("Bug : can't construct the Blob."); } } }; /** * The identity function. * @param {Object} input the input. * @return {Object} the same input. */ function identity(input) { return input; } /** * Fill in an array with a string. * @param {String} str the string to use. * @param {Array|ArrayBuffer|Uint8Array|Buffer} array the array to fill in (will be mutated). * @return {Array|ArrayBuffer|Uint8Array|Buffer} the updated array. */ function stringToArrayLike(str, array) { for (var i = 0; i < str.length; ++i) { array[i] = str.charCodeAt(i) & 0xFF; } return array; } /** * Transform an array-like object to a string. * @param {Array|ArrayBuffer|Uint8Array|Buffer} array the array to transform. * @return {String} the result. */ function arrayLikeToString(array) { // Performances notes : // -------------------- // String.fromCharCode.apply(null, array) is the fastest, see // see http://jsperf.com/converting-a-uint8array-to-a-string/2 // but the stack is limited (and we can get huge arrays !). // // result += String.fromCharCode(array[i]); generate too many strings ! // // This code is inspired by http://jsperf.com/arraybuffer-to-string-apply-performance/2 var chunk = 65536; var result = [], len = array.length, type = exports.getTypeOf(array), k = 0, canUseApply = true; try { switch(type) { case "uint8array": String.fromCharCode.apply(null, new Uint8Array(0)); break; case "nodebuffer": String.fromCharCode.apply(null, nodeBuffer(0)); break; } } catch(e) { canUseApply = false; } // no apply : slow and painful algorithm // default browser on android 4.* if (!canUseApply) { var resultStr = ""; for(var i = 0; i < array.length;i++) { resultStr += String.fromCharCode(array[i]); } return resultStr; } while (k < len && chunk > 1) { try { if (type === "array" || type === "nodebuffer") { result.push(String.fromCharCode.apply(null, array.slice(k, Math.min(k + chunk, len)))); } else { result.push(String.fromCharCode.apply(null, array.subarray(k, Math.min(k + chunk, len)))); } k += chunk; } catch (e) { chunk = Math.floor(chunk / 2); } } return result.join(""); } exports.applyFromCharCode = arrayLikeToString; /** * Copy the data from an array-like to an other array-like. * @param {Array|ArrayBuffer|Uint8Array|Buffer} arrayFrom the origin array. * @param {Array|ArrayBuffer|Uint8Array|Buffer} arrayTo the destination array which will be mutated. * @return {Array|ArrayBuffer|Uint8Array|Buffer} the updated destination array. */ function arrayLikeToArrayLike(arrayFrom, arrayTo) { for (var i = 0; i < arrayFrom.length; i++) { arrayTo[i] = arrayFrom[i]; } return arrayTo; } // a matrix containing functions to transform everything into everything. var transform = {}; // string to ? transform["string"] = { "string": identity, "array": function(input) { return stringToArrayLike(input, new Array(input.length)); }, "arraybuffer": function(input) { return transform["string"]["uint8array"](input).buffer; }, "uint8array": function(input) { return stringToArrayLike(input, new Uint8Array(input.length)); }, "nodebuffer": function(input) { return stringToArrayLike(input, nodeBuffer(input.length)); } }; // array to ? transform["array"] = { "string": arrayLikeToString, "array": identity, "arraybuffer": function(input) { return (new Uint8Array(input)).buffer; }, "uint8array": function(input) { return new Uint8Array(input); }, "nodebuffer": function(input) { return nodeBuffer(input); } }; // arraybuffer to ? transform["arraybuffer"] = { "string": function(input) { return arrayLikeToString(new Uint8Array(input)); }, "array": function(input) { return arrayLikeToArrayLike(new Uint8Array(input), new Array(input.byteLength)); }, "arraybuffer": identity, "uint8array": function(input) { return new Uint8Array(input); }, "nodebuffer": function(input) { return nodeBuffer(new Uint8Array(input)); } }; // uint8array to ? transform["uint8array"] = { "string": arrayLikeToString, "array": function(input) { return arrayLikeToArrayLike(input, new Array(input.length)); }, "arraybuffer": function(input) { return input.buffer; }, "uint8array": identity, "nodebuffer": function(input) { return nodeBuffer(input); } }; // nodebuffer to ? transform["nodebuffer"] = { "string": arrayLikeToString, "array": function(input) { return arrayLikeToArrayLike(input, new Array(input.length)); }, "arraybuffer": function(input) { return transform["nodebuffer"]["uint8array"](input).buffer; }, "uint8array": function(input) { return arrayLikeToArrayLike(input, new Uint8Array(input.length)); }, "nodebuffer": identity }; /** * Transform an input into any type. * The supported output type are : string, array, uint8array, arraybuffer, nodebuffer. * If no output type is specified, the unmodified input will be returned. * @param {String} outputType the output type. * @param {String|Array|ArrayBuffer|Uint8Array|Buffer} input the input to convert. * @throws {Error} an Error if the browser doesn't support the requested output type. */ exports.transformTo = function(outputType, input) { if (!input) { // undefined, null, etc // an empty string won't harm. input = ""; } if (!outputType) { return input; } exports.checkSupport(outputType); var inputType = exports.getTypeOf(input); var result = transform[inputType][outputType](input); return result; }; /** * Return the type of the input. * The type will be in a format valid for JSZip.utils.transformTo : string, array, uint8array, arraybuffer. * @param {Object} input the input to identify. * @return {String} the (lowercase) type of the input. */ exports.getTypeOf = function(input) { if (typeof input === "string") { return "string"; } if (Object.prototype.toString.call(input) === "[object Array]") { return "array"; } if (support.nodebuffer && nodeBuffer.test(input)) { return "nodebuffer"; } if (support.uint8array && input instanceof Uint8Array) { return "uint8array"; } if (support.arraybuffer && input instanceof ArrayBuffer) { return "arraybuffer"; } }; /** * Throw an exception if the type is not supported. * @param {String} type the type to check. * @throws {Error} an Error if the browser doesn't support the requested type. */ exports.checkSupport = function(type) { var supported = support[type.toLowerCase()]; if (!supported) { throw new Error(type + " is not supported by this browser"); } }; exports.MAX_VALUE_16BITS = 65535; exports.MAX_VALUE_32BITS = -1; // well, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF" is parsed as -1 /** * Prettify a string read as binary. * @param {string} str the string to prettify. * @return {string} a pretty string. */ exports.pretty = function(str) { var res = '', code, i; for (i = 0; i < (str || "").length; i++) { code = str.charCodeAt(i); res += '\\x' + (code < 16 ? "0" : "") + code.toString(16).toUpperCase(); } return res; }; /** * Find a compression registered in JSZip. * @param {string} compressionMethod the method magic to find. * @return {Object|null} the JSZip compression object, null if none found. */ exports.findCompression = function(compressionMethod) { for (var method in compressions) { if (!compressions.hasOwnProperty(method)) { continue; } if (compressions[method].magic === compressionMethod) { return compressions[method]; } } return null; }; /** * Cross-window, cross-Node-context regular expression detection * @param {Object} object Anything * @return {Boolean} true if the object is a regular expression, * false otherwise */ exports.isRegExp = function (object) { return Object.prototype.toString.call(object) === "[object RegExp]"; }; /** * Merge the objects passed as parameters into a new one. * @private * @param {...Object} var_args All objects to merge. * @return {Object} a new object with the data of the others. */ exports.extend = function() { var result = {}, i, attr; for (i = 0; i < arguments.length; i++) { // arguments is not enumerable in some browsers for (attr in arguments[i]) { if (arguments[i].hasOwnProperty(attr) && typeof result[attr] === "undefined") { result[attr] = arguments[i][attr]; } } } return result; };