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simplify more

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Simon Knott 2024-12-12 11:44:27 +01:00
parent 09749812bf
commit ca345d9b06
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GPG key ID: 8CEDC00028084AEC
1 changed files with 51 additions and 46 deletions
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97
packages/playwright-core/src/utils/tar.ts
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@ -14,8 +14,20 @@
* limitations under the License.
*/
import fs from 'fs';
import { Writable } from 'stream';
import { Writable, once } from 'stream';
import path from 'path';
import assert from 'assert';
enum TarType {
REGTYPE,
LNKTYPE,
SYMTYPE,
CHRTYPE,
BLKTYPE,
DIRTYPE,
FIFOTYPE,
CONTTYPE
}
function parseHeader(buffer: Buffer) {
if (buffer.length < 512)
@ -25,29 +37,21 @@ function parseHeader(buffer: Buffer) {
const prefixField = buffer.toString('utf8', 345, 500).replace(/\0/g, '');
if (prefixField)
name = path.join(prefixField, name);
name = name.replace(/^\/+/, '');
const size = parseInt(buffer.toString('utf8', 124, 136).trim(), 8);
const typeFlag = buffer[156];
const mode = parseInt(buffer.toString('utf8', 100, 108).trim(), 8);
const type = parseInt(buffer.toString('ascii', 156, 157), 10) as TarType;
const mode = parseInt(buffer.toString('utf8', 100, 108).trim(), 8) || 0o644;
const linkname = buffer.toString('utf8', 157, 257).replace(/\0/g, '');
// Parse user and group IDs
const uid = parseInt(buffer.toString('utf8', 108, 116).trim(), 8);
const gid = parseInt(buffer.toString('utf8', 116, 124).trim(), 8);
let type = 'file';
if (typeFlag === 53) // ASCII '5'
type = 'directory';
else if (typeFlag === 50) // ASCII '2'
type = 'symlink';
else if (typeFlag === 0 || typeFlag === 48) // ASCII '0'
type = 'file';
return {
name: name.replace(/^\/+/, ''),
name,
size,
type,
mode: mode || 0o644,
mode,
linkname,
uid,
gid
@ -81,48 +85,49 @@ export class TarExtractor extends Writable {
continue;
}
this.currentHeader = parseHeader(this.buffer);
const header = parseHeader(this.buffer);
this.buffer = this.buffer.subarray(512);
await this.processHeader();
if (!this.currentFileStream)
this.currentHeader = null;
const fullPath = this.outputPath(header.name);
switch (header.type) {
case TarType.DIRTYPE:
await fs.promises.mkdir(fullPath, { recursive: true, mode: 0o755 });
break;
case TarType.SYMTYPE:
await fs.promises.symlink(header.linkname, fullPath);
break;
case TarType.REGTYPE:
this.currentFileStream = fs.createWriteStream(fullPath, { mode: header.mode });
await once(this.currentFileStream, 'ready');
this.currentHeader = header;
this.remainingBytes = header.size;
break;
default:
throw new Error(`Unsupported type ${header.type} for '${header.name}'`);
}
continue;
}
if (this.remainingBytes > 0) {
const dataChunk = this.buffer.subarray(0, this.remainingBytes);
this.buffer = this.buffer.subarray(this.remainingBytes);
this.remainingBytes -= dataChunk.length;
assert(this.currentFileStream);
assert(this.remainingBytes > 0);
this.currentFileStream!.write(dataChunk);
const dataChunk = this.buffer.subarray(0, this.remainingBytes);
this.buffer = this.buffer.subarray(this.remainingBytes);
this.remainingBytes -= dataChunk.length;
if (this.remainingBytes === 0) {
const padding = 512 - (this.currentHeader!.size % 512);
if (padding < 512)
this.buffer = this.buffer.subarray(padding);
this.currentFileStream.write(dataChunk);
this.currentFileStream!.end();
this.currentHeader = null;
this.currentFileStream = null;
}
if (this.remainingBytes === 0) {
this.currentFileStream.end();
this.currentFileStream = null;
const padding = 512 - (this.currentHeader.size % 512);
if (padding < 512)
this.buffer = this.buffer.subarray(padding);
this.currentHeader = null;
}
}
}
private async processHeader() {
if (!this.currentHeader)
throw new Error('No header');
const fullPath = this.outputPath(this.currentHeader.name);
if (this.currentHeader.type === 'directory') {
await fs.promises.mkdir(fullPath, { recursive: true, mode: 0o755 });
} else if (this.currentHeader.type === 'symlink') {
await fs.promises.symlink(this.currentHeader.linkname, fullPath);
} else {
this.currentFileStream = fs.createWriteStream(fullPath, { mode: this.currentHeader.mode });
this.remainingBytes = this.currentHeader.size;
}
}
}