409 lines
9 KiB
JavaScript
409 lines
9 KiB
JavaScript
/**
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* Untar library code based on the tar-async project (MIT License):
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* https://github.com/beatgammit/tar-async
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*/
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// Production steps of ECMA-262, Edition 5, 15.4.4.18
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// Reference: http://es5.github.com/#x15.4.4.18
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if (!Array.prototype.forEach) {
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Array.prototype.forEach = function (callback, thisArg) {
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var T, k;
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if (this == null) {
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throw new TypeError(" this is null or not defined");
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}
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// 1. Let O be the result of calling ToObject passing the |this| value as the argument.
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var O = Object(this);
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// 2. Let lenValue be the result of calling the Get internal method of O with the argument "length".
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// 3. Let len be ToUint32(lenValue).
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var len = O.length >>> 0;
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// 4. If IsCallable(callback) is false, throw a TypeError exception.
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// See: http://es5.github.com/#x9.11
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if (typeof callback !== "function") {
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throw new TypeError(callback + " is not a function");
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}
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// 5. If thisArg was supplied, let T be thisArg; else let T be undefined.
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if (arguments.length > 1) {
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T = thisArg;
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}
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// 6. Let k be 0
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k = 0;
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// 7. Repeat, while k < len
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while (k < len) {
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var kValue;
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// a. Let Pk be ToString(k).
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// This is implicit for LHS operands of the in operator
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// b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk.
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// This step can be combined with c
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// c. If kPresent is true, then
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if (k in O) {
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// i. Let kValue be the result of calling the Get internal method of O with argument Pk.
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kValue = O[k];
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// ii. Call the Call internal method of callback with T as the this value and
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// argument list containing kValue, k, and O.
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callback.call(T, kValue, k, O);
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}
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// d. Increase k by 1.
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k++;
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}
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// 8. return undefined
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};
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}
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// Polyfill: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some
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if (!Array.prototype.some) {
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Array.prototype.some = function(fun /*, thisArg */)
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{
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'use strict';
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if (this === void 0 || this === null)
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throw new TypeError();
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var t = Object(this);
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var len = t.length >>> 0;
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if (typeof fun !== 'function')
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throw new TypeError();
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var thisArg = arguments.length >= 2 ? arguments[1] : void 0;
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for (var i = 0; i < len; i++)
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{
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if (i in t && fun.call(thisArg, t[i], i, t))
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return true;
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}
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return false;
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};
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}
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(function() {
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function pad(num, bytes, base) {
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num = num.toString(base || 8);
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return "000000000000".substr(num.length + 12 - bytes) + num;
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}
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/*
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struct posix_header { // byte offset
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char name[100]; // 0
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char mode[8]; // 100
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char uid[8]; // 108
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char gid[8]; // 116
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char size[12]; // 124
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char mtime[12]; // 136
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char chksum[8]; // 148
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char typeflag; // 156
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char linkname[100]; // 157
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char magic[6]; // 257
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char version[2]; // 263
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char uname[32]; // 265
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char gname[32]; // 297
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char devmajor[8]; // 329
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char devminor[8]; // 337
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char prefix[155]; // 345
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// 500
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};
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*/
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var headerFormat = [
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{
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'field': 'filename',
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'length': 100,
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'type': 'string'
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},
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{
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'field': 'mode',
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'length': 8,
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'type': 'number'
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},
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{
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'field': 'uid',
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'length': 8,
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'type': 'number'
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},
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{
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'field': 'gid',
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'length': 8,
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'type': 'number'
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},
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{
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'field': 'size',
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'length': 12,
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'type': 'number'
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},
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{
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'field': 'mtime',
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'length': 12,
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'type': 'number'
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},
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{
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'field': 'checksum',
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'length': 8,
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'type': 'number'
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},
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{
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'field': 'type',
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'length': 1,
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'type': 'number'
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},
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{
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'field': 'linkName',
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'length': 100,
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'type': 'string'
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},
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{
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'field': 'ustar',
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'length': 8,
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'type': 'string'
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},
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{
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'field': 'owner',
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'length': 32,
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'type': 'string'
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},
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{
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'field': 'group',
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'length': 32,
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'type': 'string'
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},
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{
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'field': 'majorNumber',
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'length': 8,
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'type': 'number'
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},
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{
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'field': 'minorNumber',
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'length': 8,
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'type': 'number'
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},
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{
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'field': 'filenamePrefix',
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'length': 155,
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'type': 'string'
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},
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{
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'field': 'padding',
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'length': 12
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}
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];
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function clean(length) {
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var i, buffer = new Buffer(length);
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for (i = 0; i < length; i += 1) {
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buffer[i] = 0;
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}
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return buffer;
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}
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function formatHeader(data) {
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var buffer = [];
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offset = 0;
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headerFormat.forEach(function (value) {
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var v = data[value.field] || "";
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for (var i = 0; i < v.length; ++i) {
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buffer[offset + i] = v[i];
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}
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offset += value.length;
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});
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return buffer;
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}
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var totalRead = 0,
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recordSize = 512,
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fileBuffer,
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leftToRead,
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fileTypes = [
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'normal', 'hard-link', 'symbolic-link', 'character-special', 'block-special', 'directory', 'fifo', 'contiguous-file'
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];
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function filterDecoder(input) {
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var filter = [];
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if (!input) {
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return [0, 7];
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}
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if (typeof input === 'string') {
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input = [].push(input);
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}
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if (!(input instanceof Array)) {
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console.error('Invalid fileType. Only Arrays or strings are accepted');
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return;
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}
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input.forEach(function (i) {
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var index = fileTypes.indexOf(i);
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if (index < 0) {
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console.error('Filetype not valid. Ignoring input:', i);
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return;
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}
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filter.push(i);
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});
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return filter;
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}
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function readInt(value) {
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return parseInt(value.replace(/^0*/, ''), 8) || 0;
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}
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function readString(buf) {
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var str = '';
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for (var i = 0; i < buf.length; ++i) {
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if (buf[i] == 0) { break; }
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str += String.fromCharCode(buf[i]);
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}
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return str;
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}
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function doHeader(buf, cb) {
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var data = {}, offset = 0, checksum = 0;
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function updateChecksum(value) {
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var i, length;
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for (i = 0, length = value.length; i < length; i += 1) {
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checksum += value.charCodeAt(i);
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}
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}
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headerFormat.some(function (field) {
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var tBuf = buf.subarray(offset, offset + field.length),
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tString = String.fromCharCode.apply(null, tBuf);
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offset += field.length;
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if (field.field === 'ustar' && !/ustar/.test(tString)) {
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// end the loop if not using the extended header
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return true;
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} else if (field.field === 'checksum') {
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updateChecksum(' ');
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} else {
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updateChecksum(tString);
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}
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if (field.type === 'string') {
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data[field.field] = readString(tBuf);
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} else if (field.type === 'number') {
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data[field.field] = readInt(tString);
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}
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});
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if (checksum !== data.checksum) {
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cb.call(this, 'Checksum not equal', checksum, data.checksum);
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return false;
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}
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cb.call(this, null, data, recordSize);
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return true;
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}
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function readTarFile(state, data) {
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var fileBuffer = new Uint8Array(data.size);
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fileBuffer.set(state.buffer.subarray(0, data.size));
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state.files.push({
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'meta': data,
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'buffer': fileBuffer
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});
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}
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function removeTrailingNulls(state) {
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// If we're not an even multiple, account for trailing nulls
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if (state.totalRead % recordSize) {
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var bytesBuffer = recordSize - (state.totalRead % recordSize);
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// If we don't have enough bytes to account for the nulls
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if (state.buffer.length < bytesBuffer) {
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state.totalRead += bytesBuffer;
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return;
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}
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// Throw away trailing nulls
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state.buffer = state.buffer.subarray(bytesBuffer);
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state.totalRead += bytesBuffer;
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}
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}
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function processTar(state) {
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if (state.totalRead == 0) {
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// Remove trailing nulls.
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removeTrailingNulls(state);
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}
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// Check to see if/when we are done.
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if (state.buffer.length < recordSize) {
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state.cb('done', state.totalRead, state.files, null);
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return;
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}
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state.cb('working', state.totalRead, state.files, null);
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doHeader.call(this, state.buffer, function (err, data, rOffset) {
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if (err) {
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if (rOffset === 0) {
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state.cb('done', state.totalRead, state.files, null);
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return;
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}
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return state.cb('error', state.totalRead, state.files, err);
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}
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// Update total; rOffset should always be 512
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state.totalRead += rOffset;
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state.buffer = state.buffer.subarray(rOffset);
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// Read the tar file contents.
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readTarFile(state, data);
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// Update the total and offset.
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state.totalRead += data.size;
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state.buffer = state.buffer.subarray(data.size);
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// Remove trailing nulls.
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removeTrailingNulls(state);
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if (state.buffer.length > 0) {
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setTimeout(function() {
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processTar(state);
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}, 0);
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} else {
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state.cb('done', state.totalRead, state.files, null);
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}
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});
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}
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/*
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* Extract data from an input.
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*
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* @param data The data, in Uint8Array form.
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*/
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function Untar(data) {
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this.data = data;
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}
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Untar.prototype.process = function(cb, opt_filter) {
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return processTar({
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'cb': cb,
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'buffer': this.data,
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'fileTypes': filterDecoder(opt_filter || []),
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'totalRead': 0,
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'files': []
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});
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};
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window.Untar = Untar;
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})();
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