@eagleoutice/flowr-dev/project/sigdb/index-format.js

Static Dataflow Analyzer and Program Slicer for the R Programming Language

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.encodeIndex = encodeIndex;
exports.decodeIndex = decodeIndex;
exports.readSigDbIndex = readSigDbIndex;
/**
 * The sidecar `.idx` index format: the byte ranges a reader seeks to (dictionary + per-package blob) plus the
 * package routing/metadata, and its compact on-disk (wire) form. Split out of `../sigdb` so the reader/writer
 * there does not carry the index encoding.
 */
const fs_1 = __importDefault(require("fs"));
/** encode an index to its compact on-disk form; omit `meta` when it is hoisted elsewhere (a manifest) */
function encodeIndex(i, withMeta = true) {
    return { n: i.byteCount, d: i.dict, b: i.blobs, p: i.pkgs, ...(withMeta ? { m: i.meta } : {}) };
}
/** decode a compact index; `meta` falls back to a hoisted map, and `dict` to empty (a blob-only shard) */
function decodeIndex(w, meta) {
    const full = w;
    return { byteCount: w.n, dict: full.d ?? [0, 0], blobs: w.b, pkgs: w.p, meta: full.m ?? meta ?? {} };
}
/** read a plain bundle's sidecar `.idx` file and decode it */
function readSigDbIndex(plainFile) {
    return decodeIndex(JSON.parse(fs_1.default.readFileSync(`${plainFile}.idx`, 'utf8')));
}
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