首页 > 解决方案 > Deno:处理 tar 存档会导致校验和错误(标准库)

问题描述

我想tar.tsStandard Library的帮助下处理一个 tar 存档。

test.tar存档可以通过以下代码成功写入:

import { Tar, Untar } from "https://deno.land/std/archive/tar.ts";

// create tar archive
const tar = new Tar();
const content = new TextEncoder().encode("hello tar world!");
await tar.append("output.txt", {
  reader: new Deno.Buffer(content),
  contentSize: content.byteLength,
});
await Deno.writeFile("./test.tar", tar.out);

但是,读取 tar 会触发错误:

error: Uncaught Error: checksum error  
      throw new Error("checksum error");  
        --------^
    at Untar.extract (https://deno.land/std/archive/tar.ts:432:13)  
    at async file:///C:/Users/bela/Desktop/script/test.ts:23:16  

编码:

// read from tar archive
const untar = new Untar(await Deno.open("./test.tar"));
const buf = new Deno.Buffer();
const result = await untar.extract(buf); // <-- this line triggers error
const untarText = new TextDecoder("utf-8").decode(buf.bytes());

我哪里漏了一步?

标签: tardeno

解决方案


您必须使用tar.getReader()才能获得正确的tar内容。

const tar = new Tar();
const content = new TextEncoder().encode("hello tar world!");
await tar.append("output.txt", {
    reader: new Deno.Buffer(content),
    contentSize: content.byteLength,
});

const writer = await Deno.open("./test.tar", { write: true, create: true });
await Deno.copy(tar.getReader(), writer);
const untar = new Untar(await Deno.open("./test.tar", { read: true }));
const buf = new Deno.Buffer();
const result = await untar.extract(buf); // <-- this line triggers error
const untarText = new TextDecoder("utf-8").decode(buf.bytes());
console.log(untarText);

tar.out当前是零填充的Uint8Array,这似乎是 std 代码中的错误


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