111 lines
2.5 KiB
JavaScript
111 lines
2.5 KiB
JavaScript
/*
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* tar-js
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* MIT (c) 2011 T. Jameson Little
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*/
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(function () {
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"use strict";
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var header = require("./header"),
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utils = require("./utils"),
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recordSize = 512,
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blockSize;
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function Tar(recordsPerBlock) {
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this.written = 0;
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blockSize = (recordsPerBlock || 20) * recordSize;
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this.out = utils.clean(blockSize);
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}
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Tar.prototype.append = function (filepath, input, opts, callback) {
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var data,
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checksum,
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mode,
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mtime,
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uid,
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gid,
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headerArr;
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if (typeof input === 'string') {
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input = utils.stringToUint8(input);
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} else if (input.constructor !== Uint8Array.prototype.constructor) {
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throw 'Invalid input type. You gave me: ' + input.constructor.toString().match(/function\s*([$A-Za-z_][0-9A-Za-z_]*)\s*\(/)[1];
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}
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if (typeof opts === 'function') {
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callback = opts;
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opts = {};
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}
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opts = opts || {};
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mode = opts.mode || parseInt('777', 8) & 0xfff;
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mtime = opts.mtime || Math.floor(+new Date() / 1000);
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uid = opts.uid || 0;
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gid = opts.gid || 0;
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data = {
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fileName: filepath,
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fileMode: utils.pad(mode, 7),
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uid: utils.pad(uid, 7),
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gid: utils.pad(gid, 7),
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fileSize: utils.pad(input.length, 11),
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mtime: utils.pad(mtime, 11),
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checksum: ' ',
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type: '0', // just a file
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ustar: 'ustar ',
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owner: opts.owner || '',
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group: opts.group || ''
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};
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// calculate the checksum
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checksum = 0;
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Object.keys(data).forEach(function (key) {
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var i, value = data[key], 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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data.checksum = utils.pad(checksum, 6) + "\u0000 ";
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headerArr = header.format(data);
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var i, offset, length;
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this.out.set(headerArr, this.written);
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this.written += headerArr.length;
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// If there is not enough space in this.out, we need to expand it to
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// fit the new input.
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if (this.written + input.length > this.out.length) {
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this.out = utils.extend(this.out, this.written, input.length, blockSize);
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}
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this.out.set(input, this.written);
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// to the nearest multiple of recordSize
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this.written += input.length + (recordSize - (input.length % recordSize || recordSize));
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// make sure there's at least 2 empty records worth of extra space
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if (this.out.length - this.written < recordSize * 2) {
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this.out = utils.extend(this.out, this.written, recordSize * 2, blockSize);
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}
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if (typeof callback === 'function') {
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callback(this.out);
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}
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return this.out;
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};
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Tar.prototype.clear = function () {
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this.written = 0;
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this.out = utils.clean(blockSize);
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};
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module.exports = Tar;
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}());
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