First commit containing tar package
This commit is contained in:
Fabian Stamm
6
tar/src/deps.ts
Normal file
6
tar/src/deps.ts
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@ -0,0 +1,6 @@
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export * as Tar from "https://deno.land/std@0.62.0/archive/tar.ts";
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export * as Path from "https://deno.land/std@0.62.0/path/mod.ts";
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export * as FS from "https://deno.land/std@0.62.0/fs/mod.ts";
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export * as IO_Readers from "https://deno.land/std@0.62.0/io/readers.ts";
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export * as IO_BufIO from "https://deno.land/std@0.62.0/io/bufio.ts";
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export * as Assert from "https://deno.land/std@0.62.0/_util/assert.ts";
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73
tar/src/mod.ts
Normal file
73
tar/src/mod.ts
Normal file
@ -0,0 +1,73 @@
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import { FS, Path } from "./deps.ts";
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import { Tar, Untar } from "./tar.ts";
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export async function uncompress(src: string, dest: string): Promise<void> {
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const tarFile = await Deno.open(src, { read: true });
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const untar = new Untar(tarFile);
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for await (const entry of untar) {
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if (entry.type === "directory") {
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await FS.ensureDir(Path.join(dest, entry.fileName));
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} else if (entry.type === "file") {
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const path = Path.join(dest, entry.fileName);
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await FS.ensureFile(path);
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const file = await Deno.open(path, { write: true, create: true });
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await Deno.copy(entry, file);
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file.close();
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} else {
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//TODO: Error/Warning
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}
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}
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tarFile.close();
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}
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export interface ICompressOptions {
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excludeSrc?: boolean;
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}
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export async function compress(
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src: string,
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dest: string,
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options?: ICompressOptions
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): Promise<void> {
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src = Path.resolve(src);
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const tar = new Tar();
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const stat = await Deno.lstat(src);
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if (stat.isFile) {
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tar.append(Path.basename(src), {
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filePath: src,
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});
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} else {
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let root = src;
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if (!options?.excludeSrc) {
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root = Path.dirname(src);
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await tar.append(Path.basename(src), {
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type: "directory",
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reader: new Deno.Buffer(),
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contentSize: 0,
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});
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}
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const walker = FS.walk(src, { includeDirs: true, includeFiles: true });
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for await (const file of walker) {
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const relativePath = Path.relative(root, file.path);
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if (file.isDirectory) {
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await tar.append(relativePath, {
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type: "directory",
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reader: new Deno.Buffer(),
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contentSize: 0,
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});
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} else {
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await tar.append(relativePath, {
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filePath: file.path,
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type: "file",
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});
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}
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}
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}
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const writer = await Deno.open(dest, { write: true, create: true });
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await Deno.copy(tar.getReader(), writer);
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writer.close();
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}
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13
tar/src/mod_test.ts
Normal file
13
tar/src/mod_test.ts
Normal file
@ -0,0 +1,13 @@
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import { compress, uncompress } from "./mod.ts";
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console.log("Compressing (excludeSrc:false)");
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await compress("demo", "demo.tar");
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console.log("Decompressing (excludeSrc:false)");
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await uncompress("demo.tar", "demo-unpacked");
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console.log("Compressing (excludeSrc:true)");
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await compress("demo", "demo2.tar", { excludeSrc: true });
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console.log("Decompressing (excludeSrc:true)");
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await uncompress("demo2.tar", "demo2-unpacked");
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639
tar/src/tar.ts
Normal file
639
tar/src/tar.ts
Normal file
@ -0,0 +1,639 @@
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/**
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* Ported and modified from: https://github.com/beatgammit/tar-js and
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* licensed as:
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*
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* (The MIT License)
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*
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* Copyright (c) 2011 T. Jameson Little
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* Copyright (c) 2019 Jun Kato
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* Copyright (c) 2020 the Deno authors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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import { IO_Readers, IO_BufIO, Assert } from "./deps.ts";
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const { MultiReader } = IO_Readers;
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const { PartialReadError } = IO_BufIO;
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type Reader = Deno.Reader;
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type Seeker = Deno.Seeker;
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const recordSize = 512;
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const ustar = "ustar\u000000";
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// https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
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// eight checksum bytes taken to be ascii spaces (decimal value 32)
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const initialChecksum = 8 * 32;
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async function readBlock(
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reader: Deno.Reader,
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p: Uint8Array
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): Promise<number | null> {
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let bytesRead = 0;
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while (bytesRead < p.length) {
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const rr = await reader.read(p.subarray(bytesRead));
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if (rr === null) {
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if (bytesRead === 0) {
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return null;
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} else {
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throw new PartialReadError();
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}
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}
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bytesRead += rr;
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}
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return bytesRead;
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}
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/**
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* Simple file reader
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*/
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class FileReader implements Reader {
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private file?: Deno.File;
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constructor(private filePath: string) {}
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public async read(p: Uint8Array): Promise<number | null> {
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if (!this.file) {
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this.file = await Deno.open(this.filePath, { read: true });
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}
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const res = await Deno.read(this.file.rid, p);
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if (res === null) {
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Deno.close(this.file.rid);
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this.file = undefined;
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}
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return res;
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}
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}
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/**
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* Remove the trailing null codes
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* @param buffer
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*/
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function trim(buffer: Uint8Array): Uint8Array {
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const index = buffer.findIndex((v): boolean => v === 0);
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if (index < 0) return buffer;
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return buffer.subarray(0, index);
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}
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/**
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* Initialize Uint8Array of the specified length filled with 0
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* @param length
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*/
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function clean(length: number): Uint8Array {
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const buffer = new Uint8Array(length);
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buffer.fill(0, 0, length - 1);
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return buffer;
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}
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function pad(num: number, bytes: number, base?: number): string {
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const numString = num.toString(base || 8);
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return "000000000000".substr(numString.length + 12 - bytes) + numString;
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}
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const types: { [key: string]: string } = {
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"": "file",
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"0": "file",
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"1": "link",
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"2": "symlink",
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"3": "character-device",
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"4": "block-device",
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"5": "directory",
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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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const ustarStructure: Array<{ field: string; length: number }> = [
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{
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field: "fileName",
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length: 100,
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},
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{
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field: "fileMode",
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length: 8,
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},
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{
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field: "uid",
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length: 8,
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},
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{
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field: "gid",
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length: 8,
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},
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{
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field: "fileSize",
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length: 12,
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},
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{
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field: "mtime",
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length: 12,
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},
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{
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field: "checksum",
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length: 8,
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},
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{
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field: "type",
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length: 1,
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},
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{
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field: "linkName",
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length: 100,
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},
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{
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field: "ustar",
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length: 8,
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},
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{
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field: "owner",
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length: 32,
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},
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{
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field: "group",
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length: 32,
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},
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{
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field: "majorNumber",
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length: 8,
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},
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{
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field: "minorNumber",
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length: 8,
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},
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{
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field: "fileNamePrefix",
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length: 155,
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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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/**
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* Create header for a file in a tar archive
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*/
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function formatHeader(data: TarData): Uint8Array {
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const encoder = new TextEncoder(),
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buffer = clean(512);
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let offset = 0;
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ustarStructure.forEach(function (value): void {
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const entry = encoder.encode(data[value.field as keyof TarData] || "");
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buffer.set(entry, offset);
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offset += value.length; // space it out with nulls
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});
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return buffer;
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}
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/**
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* Parse file header in a tar archive
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* @param length
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*/
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function parseHeader(buffer: Uint8Array): { [key: string]: Uint8Array } {
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const data: { [key: string]: Uint8Array } = {};
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let offset = 0;
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ustarStructure.forEach(function (value): void {
|
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const arr = buffer.subarray(offset, offset + value.length);
|
||||
data[value.field] = arr;
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offset += value.length;
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});
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return data;
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}
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interface TarHeader {
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[key: string]: Uint8Array;
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}
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export interface TarData {
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fileName?: string;
|
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fileNamePrefix?: string;
|
||||
fileMode?: string;
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uid?: string;
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gid?: string;
|
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fileSize?: string;
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mtime?: string;
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checksum?: string;
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type?: string;
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ustar?: string;
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owner?: string;
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group?: string;
|
||||
}
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||||
|
||||
export interface TarDataWithSource extends TarData {
|
||||
/**
|
||||
* file to read
|
||||
*/
|
||||
filePath?: string;
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||||
/**
|
||||
* buffer to read
|
||||
*/
|
||||
reader?: Reader;
|
||||
}
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||||
export interface TarInfo {
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||||
fileMode?: number;
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||||
mtime?: number;
|
||||
uid?: number;
|
||||
gid?: number;
|
||||
owner?: string;
|
||||
group?: string;
|
||||
type?: string;
|
||||
}
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||||
|
||||
export interface TarOptions extends TarInfo {
|
||||
/**
|
||||
* append file
|
||||
*/
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filePath?: string;
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/**
|
||||
* append any arbitrary content
|
||||
*/
|
||||
reader?: Reader;
|
||||
|
||||
/**
|
||||
* size of the content to be appended
|
||||
*/
|
||||
contentSize?: number;
|
||||
}
|
||||
|
||||
export interface TarMeta extends TarInfo {
|
||||
fileName: string;
|
||||
fileSize?: number;
|
||||
}
|
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|
||||
// eslint-disable-next-line @typescript-eslint/no-empty-interface
|
||||
interface TarEntry extends TarMeta {}
|
||||
|
||||
/**
|
||||
* A class to create a tar archive
|
||||
*/
|
||||
export class Tar {
|
||||
data: TarDataWithSource[];
|
||||
|
||||
constructor() {
|
||||
this.data = [];
|
||||
}
|
||||
|
||||
/**
|
||||
* Append a file to this tar archive
|
||||
* @param fn file name
|
||||
* e.g., test.txt; use slash for directory separators
|
||||
* @param opts options
|
||||
*/
|
||||
async append(fn: string, opts: TarOptions): Promise<void> {
|
||||
if (typeof fn !== "string") {
|
||||
throw new Error("file name not specified");
|
||||
}
|
||||
let fileName = fn;
|
||||
// separate file name into two parts if needed
|
||||
let fileNamePrefix: string | undefined;
|
||||
if (fileName.length > 100) {
|
||||
let i = fileName.length;
|
||||
while (i >= 0) {
|
||||
i = fileName.lastIndexOf("/", i);
|
||||
if (i <= 155) {
|
||||
fileNamePrefix = fileName.substr(0, i);
|
||||
fileName = fileName.substr(i + 1);
|
||||
break;
|
||||
}
|
||||
i--;
|
||||
}
|
||||
const errMsg =
|
||||
"ustar format does not allow a long file name (length of [file name" +
|
||||
"prefix] + / + [file name] must be shorter than 256 bytes)";
|
||||
if (i < 0 || fileName.length > 100) {
|
||||
throw new Error(errMsg);
|
||||
} else {
|
||||
Assert.assert(fileNamePrefix != null);
|
||||
if (fileNamePrefix.length > 155) {
|
||||
throw new Error(errMsg);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
opts = opts || {};
|
||||
|
||||
// set meta data
|
||||
let info: Deno.FileInfo | undefined;
|
||||
if (opts.filePath) {
|
||||
info = await Deno.stat(opts.filePath);
|
||||
}
|
||||
|
||||
const mode =
|
||||
opts.fileMode || (info && info.mode) || parseInt("777", 8) & 0xfff,
|
||||
mtime = Math.floor(
|
||||
opts.mtime ?? (info?.mtime ?? new Date()).valueOf() / 1000
|
||||
),
|
||||
uid = opts.uid || 0,
|
||||
gid = opts.gid || 0;
|
||||
if (typeof opts.owner === "string" && opts.owner.length >= 32) {
|
||||
throw new Error(
|
||||
"ustar format does not allow owner name length >= 32 bytes"
|
||||
);
|
||||
}
|
||||
if (typeof opts.group === "string" && opts.group.length >= 32) {
|
||||
throw new Error(
|
||||
"ustar format does not allow group name length >= 32 bytes"
|
||||
);
|
||||
}
|
||||
|
||||
const fileSize = info?.size ?? opts.contentSize;
|
||||
Assert.assert(fileSize != null, "fileSize must be set");
|
||||
|
||||
let type = "0";
|
||||
if (opts.type) {
|
||||
if (types[opts.type]) type = opts.type;
|
||||
else {
|
||||
type =
|
||||
Object.keys(types).find((e) => types[e] === opts.type) || "0";
|
||||
}
|
||||
}
|
||||
|
||||
const tarData: TarDataWithSource = {
|
||||
fileName,
|
||||
fileNamePrefix,
|
||||
fileMode: pad(mode, 7),
|
||||
uid: pad(uid, 7),
|
||||
gid: pad(gid, 7),
|
||||
fileSize: pad(fileSize, 11),
|
||||
mtime: pad(mtime, 11),
|
||||
checksum: " ",
|
||||
type, // just a file
|
||||
ustar,
|
||||
owner: opts.owner || "",
|
||||
group: opts.group || "",
|
||||
filePath: opts.filePath,
|
||||
reader: opts.reader,
|
||||
};
|
||||
|
||||
// calculate the checksum
|
||||
let checksum = 0;
|
||||
const encoder = new TextEncoder();
|
||||
Object.keys(tarData)
|
||||
.filter((key): boolean => ["filePath", "reader"].indexOf(key) < 0)
|
||||
.forEach(function (key): void {
|
||||
checksum += encoder
|
||||
.encode(tarData[key as keyof TarData])
|
||||
.reduce((p, c): number => p + c, 0);
|
||||
});
|
||||
|
||||
tarData.checksum = pad(checksum, 6) + "\u0000 ";
|
||||
this.data.push(tarData);
|
||||
}
|
||||
|
||||
/**
|
||||
* Get a Reader instance for this tar data
|
||||
*/
|
||||
getReader(): Reader {
|
||||
const readers: Reader[] = [];
|
||||
this.data.forEach((tarData): void => {
|
||||
let { reader } = tarData;
|
||||
const { filePath } = tarData;
|
||||
const headerArr = formatHeader(tarData);
|
||||
readers.push(new Deno.Buffer(headerArr));
|
||||
if (!reader) {
|
||||
Assert.assert(filePath != null);
|
||||
reader = new FileReader(filePath);
|
||||
}
|
||||
readers.push(reader);
|
||||
|
||||
// to the nearest multiple of recordSize
|
||||
Assert.assert(tarData.fileSize != null, "fileSize must be set");
|
||||
readers.push(
|
||||
new Deno.Buffer(
|
||||
clean(
|
||||
recordSize -
|
||||
(parseInt(tarData.fileSize, 8) % recordSize || recordSize)
|
||||
)
|
||||
)
|
||||
);
|
||||
});
|
||||
|
||||
// append 2 empty records
|
||||
readers.push(new Deno.Buffer(clean(recordSize * 2)));
|
||||
return new MultiReader(...readers);
|
||||
}
|
||||
}
|
||||
|
||||
class TarEntry implements Reader {
|
||||
#header: TarHeader;
|
||||
#reader: Reader | (Reader & Deno.Seeker);
|
||||
#size: number;
|
||||
#read = 0;
|
||||
#consumed = false;
|
||||
#entrySize: number;
|
||||
constructor(
|
||||
meta: TarMeta,
|
||||
header: TarHeader,
|
||||
reader: Reader | (Reader & Deno.Seeker)
|
||||
) {
|
||||
Object.assign(this, meta);
|
||||
this.#header = header;
|
||||
this.#reader = reader;
|
||||
|
||||
// File Size
|
||||
this.#size = this.fileSize || 0;
|
||||
// Entry Size
|
||||
const blocks = Math.ceil(this.#size / recordSize);
|
||||
this.#entrySize = blocks * recordSize;
|
||||
}
|
||||
|
||||
get consumed(): boolean {
|
||||
return this.#consumed;
|
||||
}
|
||||
|
||||
async read(p: Uint8Array): Promise<number | null> {
|
||||
// Bytes left for entry
|
||||
const entryBytesLeft = this.#entrySize - this.#read;
|
||||
const bufSize = Math.min(
|
||||
// bufSize can't be greater than p.length nor bytes left in the entry
|
||||
p.length,
|
||||
entryBytesLeft
|
||||
);
|
||||
|
||||
if (entryBytesLeft <= 0) return null;
|
||||
|
||||
const block = new Uint8Array(bufSize);
|
||||
const n = await readBlock(this.#reader, block);
|
||||
const bytesLeft = this.#size - this.#read;
|
||||
|
||||
this.#read += n || 0;
|
||||
if (n === null || bytesLeft <= 0) {
|
||||
if (null) this.#consumed = true;
|
||||
return null;
|
||||
}
|
||||
|
||||
// Remove zero filled
|
||||
const offset = bytesLeft < n ? bytesLeft : n;
|
||||
p.set(block.subarray(0, offset), 0);
|
||||
|
||||
return offset < 0 ? n - Math.abs(offset) : offset;
|
||||
}
|
||||
|
||||
async discard(): Promise<void> {
|
||||
// Discard current entry
|
||||
if (this.#consumed) return;
|
||||
this.#consumed = true;
|
||||
|
||||
if (typeof (this.#reader as Seeker).seek === "function") {
|
||||
await (this.#reader as Seeker).seek(
|
||||
this.#entrySize - this.#read,
|
||||
Deno.SeekMode.Current
|
||||
);
|
||||
this.#read = this.#entrySize;
|
||||
} else {
|
||||
await Deno.readAll(this);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* A class to extract a tar archive
|
||||
*/
|
||||
export class Untar {
|
||||
reader: Reader;
|
||||
block: Uint8Array;
|
||||
#entry: TarEntry | undefined;
|
||||
|
||||
constructor(reader: Reader) {
|
||||
this.reader = reader;
|
||||
this.block = new Uint8Array(recordSize);
|
||||
}
|
||||
|
||||
#checksum = (header: Uint8Array): number => {
|
||||
let sum = initialChecksum;
|
||||
for (let i = 0; i < 512; i++) {
|
||||
if (i >= 148 && i < 156) {
|
||||
// Ignore checksum header
|
||||
continue;
|
||||
}
|
||||
sum += header[i];
|
||||
}
|
||||
return sum;
|
||||
};
|
||||
|
||||
#getHeader = async (): Promise<TarHeader | null> => {
|
||||
await readBlock(this.reader, this.block);
|
||||
const header = parseHeader(this.block);
|
||||
|
||||
// calculate the checksum
|
||||
const decoder = new TextDecoder();
|
||||
const checksum = this.#checksum(this.block);
|
||||
|
||||
if (parseInt(decoder.decode(header.checksum), 8) !== checksum) {
|
||||
if (checksum === initialChecksum) {
|
||||
// EOF
|
||||
return null;
|
||||
}
|
||||
throw new Error("checksum error");
|
||||
}
|
||||
|
||||
const magic = decoder.decode(header.ustar);
|
||||
|
||||
if (magic.indexOf("ustar")) {
|
||||
throw new Error(`unsupported archive format: ${magic}`);
|
||||
}
|
||||
|
||||
return header;
|
||||
};
|
||||
|
||||
#getMetadata = (header: TarHeader): TarMeta => {
|
||||
const decoder = new TextDecoder();
|
||||
// get meta data
|
||||
const meta: TarMeta = {
|
||||
fileName: decoder.decode(trim(header.fileName)),
|
||||
};
|
||||
const fileNamePrefix = trim(header.fileNamePrefix);
|
||||
if (fileNamePrefix.byteLength > 0) {
|
||||
meta.fileName = decoder.decode(fileNamePrefix) + "/" + meta.fileName;
|
||||
}
|
||||
(["fileMode", "mtime", "uid", "gid"] as [
|
||||
"fileMode",
|
||||
"mtime",
|
||||
"uid",
|
||||
"gid"
|
||||
]).forEach((key): void => {
|
||||
const arr = trim(header[key]);
|
||||
if (arr.byteLength > 0) {
|
||||
meta[key] = parseInt(decoder.decode(arr), 8);
|
||||
}
|
||||
});
|
||||
(["owner", "group", "type"] as ["owner", "group", "type"]).forEach(
|
||||
(key): void => {
|
||||
const arr = trim(header[key]);
|
||||
if (arr.byteLength > 0) {
|
||||
meta[key] = decoder.decode(arr);
|
||||
}
|
||||
}
|
||||
);
|
||||
|
||||
meta.fileSize = parseInt(decoder.decode(header.fileSize), 8);
|
||||
meta.type = types[meta.type as string] || meta.type;
|
||||
|
||||
return meta;
|
||||
};
|
||||
|
||||
async extract(): Promise<TarEntry | null> {
|
||||
if (this.#entry && !this.#entry.consumed) {
|
||||
// If entry body was not read, discard the body
|
||||
// so we can read the next entry.
|
||||
await this.#entry.discard();
|
||||
}
|
||||
|
||||
const header = await this.#getHeader();
|
||||
if (header === null) return null;
|
||||
|
||||
const meta = this.#getMetadata(header);
|
||||
|
||||
this.#entry = new TarEntry(meta, header, this.reader);
|
||||
|
||||
return this.#entry;
|
||||
}
|
||||
|
||||
async *[Symbol.asyncIterator](): AsyncIterableIterator<TarEntry> {
|
||||
while (true) {
|
||||
const entry = await this.extract();
|
||||
|
||||
if (entry === null) return;
|
||||
|
||||
yield entry;
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user