@alinex/datastore/lib/compression/index.js

Read, work and write data structures from and to differents locations and formats.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.compress = exports.uncompress = exports.compressions = void 0;
const path_1 = require("path");
const debug_1 = require("debug");
const debug = debug_1.default("datastore:compression");
exports.compressions = ["gzip", "deflate", "brotli", "bzip2", "lzma", "tar", "tgz", "tbz2", "tlz", "zip"];
const alias = {
    br: "brotli",
    gz: "gzip",
    "tar.gz": "tgz",
    "tar.bz2": "tbz2",
    "tar.lzma": "tlz"
};
function detect(pathname) {
    if (!path_1.extname(pathname))
        return null;
    let ext = path_1.extname(path_1.basename(pathname, path_1.extname(pathname)))
        .replace(/^\./, "")
        .toLowerCase() + path_1.extname(pathname).toLowerCase();
    if (alias[ext])
        ext = alias[ext];
    if (exports.compressions.indexOf(ext) !== -1)
        return ext;
    ext = path_1.extname(pathname)
        .replace(/^\./, "")
        .toLowerCase();
    if (alias[ext])
        ext = alias[ext];
    if (exports.compressions.indexOf(ext) !== -1)
        return ext;
    return detect(path_1.basename(pathname, path_1.extname(pathname)));
}
const handler = function (parsedUri, options) {
    let ext = null;
    if (options && options.compression) {
        ext = options.compression;
        if (ext) {
            if (alias[ext])
                ext = alias[ext];
            if (exports.compressions.indexOf(ext) == -1)
                ext = null;
        }
    }
    else {
        ext = detect(parsedUri.pathname);
    }
    if (!ext)
        ext = "none";
    return Promise.resolve().then(() => require(`./${ext}`));
};
exports.uncompress = async function (parsedUri, buffer, options) {
    if (debug.enabled) {
        const size = buffer.length;
        return handler(parsedUri, options).then(mod => mod.uncompress(parsedUri, buffer).then(buffer => {
            if (buffer.length != size)
                debug(`size ${size} bytes -> ${buffer.length} bytes`);
            return buffer;
        }));
    }
    return handler(parsedUri, options).then(mod => mod.uncompress(parsedUri, buffer));
};
exports.compress = async function (parsedUri, buffer, options) {
    if (debug.enabled) {
        const size = buffer.length;
        return handler(parsedUri, options).then(mod => mod.compress(parsedUri, buffer).then(buffer => {
            if (buffer.length != size)
                debug(`size ${size} bytes -> ${buffer.length} bytes`);
            return buffer;
        }));
    }
    return handler(parsedUri, options).then(mod => mod.compress(parsedUri, buffer));
};
exports.default = { compress: exports.compress, uncompress: exports.uncompress };
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