rezip.js

// Copyright (C) 2020 Micro Focus or one of its affiliates.

import fs from 'fs';

// Open the given vsix file and patch the Linux debug adapter binary to be executable
if (process.argv.length < 3) {
    console.log("usage: rezip <vsix>");
    process.exit(1);
} else {
    let vsixPath = process.argv[2];
    console.log(`Fixing ${vsixPath}...`)

    var buffer = fs.readFileSync(vsixPath);

    for (let i = buffer.length - 4; i >= 0; i--) {
        let signature = buffer.readInt32BE(i);
        if (signature == 0x504B0102) {
            let fileNameLen = buffer.readInt16LE(i + 0x1C);
            let name = "";
            for (let j = 0; j < fileNameLen; j++) {
                let b = buffer.readUInt8(i + 0x2E + j);
                name += String.fromCharCode(b);
            }

            let fileAttributes = buffer.readUInt32LE(i + 0x26);
            if (name === 'extension/bin/debugadapter/linux-x64/MicroFocus.VsCodeDebugProtocol') {
                fileAttributes = 0x81FF8000;
                buffer.writeUInt32LE(fileAttributes, i + 0x26);
                break;
            }
        }
    }

    fs.writeFileSync(vsixPath, buffer);
}