@cspell/cspell-tools/dist/gzip/compressFiles.js

Tools to assist with the development of cSpell

import { readFile, writeFile } from 'node:fs/promises';
import { promisify } from 'node:util';
import { gunzip as gunzipCB, gzip as gz, gzipSync } from 'node:zlib';
const gzip = promisify(gz);
const gunzip = promisify(gunzipCB);
export var OSFlags;
(function (OSFlags) {
    OSFlags[OSFlags["auto"] = -1] = "auto";
    OSFlags[OSFlags["FAT"] = 0] = "FAT";
    OSFlags[OSFlags["Unix"] = 3] = "Unix";
    OSFlags[OSFlags["HPFS"] = 6] = "HPFS";
    OSFlags[OSFlags["MACOS"] = 7] = "MACOS";
    OSFlags[OSFlags["NTFS"] = 11] = "NTFS";
})(OSFlags || (OSFlags = {}));
// https://docs.fileformat.com/compression/gz/#:~:text=A%20GZ%20file%20is%20a,compression%20formats%20on%20UNIX%20systems.
const OSSystemIDOffset = 9;
export async function compressFile(file, os) {
    if (file.endsWith('.gz'))
        return file;
    const targetFile = file + '.gz';
    const zBuf = await compress(await readFile(file), os);
    await writeFile(targetFile, zBuf);
    return targetFile;
}
export async function compress(buf, os) {
    return fixOSSystemID(await gzip(buf), os);
}
export function compressSync(buf, os) {
    return fixOSSystemID(gzipSync(buf), os);
}
function fixOSSystemID(zBuf, os = OSFlags.Unix) {
    const osFlag = os == OSFlags.auto ? zBuf[OSSystemIDOffset] : os;
    zBuf[OSSystemIDOffset] = osFlag;
    return zBuf;
}
export async function decompress(buf, encoding) {
    const dBuf = gunzip(buf);
    if (!encoding)
        return dBuf;
    return (await dBuf).toString(encoding);
}
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