mirror of
https://github.com/bilawalsidhu/gods-eye-view.git
synced 2026-11-04 02:14:01 +00:00
Sameh Khamis
73e789489b
Knip, configured with the application, package exports, scripts, QA harnesses, workers, tools and tests as entry points, reports exports that no module imports. Each was checked by hand against string-based and namespace imports. - Symbols that are still used inside their own module lose only the `export` keyword (176 constants and helpers). - Unused re-exports are removed from barrel modules (flight, military, vessel, CCTV, directions, transit history, local ADS-B and street-level policy modules). - Declarations that nothing uses at all are deleted, among them AIS_WATCHDOG_STATUSES, applyFilter, isRadioCountryCode, compactText, DENSITY_STOPS, the unused CCTV endpoint constants, and the SDR band constants. - Default exports that nothing imports are removed. The ones in src/data/earthquakes.js, src/data/telegeographySubmarineCables.js, src/data/wind.js and src/data/bhoteKoshiLocator.js each constructed a layer instance at import time that nothing used; those instances are no longer created. Every export of a package.json entry stays, as does TOMTOM_CREDIT, which the traffic layer reads from the credits namespace it is given.
75 lines
2.7 KiB
JavaScript
75 lines
2.7 KiB
JavaScript
// Inspect encoded headers before allowing the browser to decode local images.
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const MAX_IMPORT_IMAGE_PIXELS = 16 * 1024 * 1024;
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const MAX_SIDE = 8192;
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/** Width and height from a supported raster header; no image is decoded. */
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export function importImageSize(bytes) {
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const v = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
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const ascii = (at, n) => String.fromCharCode(...bytes.subarray(at, at + n));
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const u24 = (at) => bytes[at] | (bytes[at + 1] << 8) | (bytes[at + 2] << 16);
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if (
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bytes.length >= 24 &&
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v.getUint32(0) === 0x89504e47 &&
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ascii(12, 4) === 'IHDR'
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)
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return [v.getUint32(16), v.getUint32(20)];
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if (bytes.length >= 10 && /^GIF8[79]a$/.test(ascii(0, 6)))
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return [v.getUint16(6, true), v.getUint16(8, true)];
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if (bytes.length >= 26 && ascii(0, 2) === 'BM') {
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if (v.getUint32(14, true) === 12)
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return [v.getUint16(18, true), v.getUint16(20, true)];
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return [Math.abs(v.getInt32(18, true)), Math.abs(v.getInt32(22, true))];
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}
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if (bytes.length >= 30 && ascii(0, 4) === 'RIFF' && ascii(8, 4) === 'WEBP') {
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const kind = ascii(12, 4);
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if (kind === 'VP8X') return [1 + u24(24), 1 + u24(27)];
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if (kind === 'VP8 ' && u24(23) === 0x2a019d)
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return [v.getUint16(26, true) & 0x3fff, v.getUint16(28, true) & 0x3fff];
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if (kind === 'VP8L' && bytes[20] === 0x2f) {
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const bits = v.getUint32(21, true);
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return [(bits & 0x3fff) + 1, ((bits >>> 14) & 0x3fff) + 1];
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}
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}
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if (bytes.length >= 4 && v.getUint16(0) === 0xffd8) {
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for (let at = 2; at + 4 <= bytes.length;) {
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if (bytes[at++] !== 0xff) break;
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while (bytes[at] === 0xff) at++;
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const marker = bytes[at++];
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if (marker === 0xd9 || marker === 0xda) break;
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if (marker === 1 || (marker >= 0xd0 && marker <= 0xd7)) continue;
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const length = v.getUint16(at);
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if (length < 2 || at + length > bytes.length) break;
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if (
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[
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0xc0, 0xc1, 0xc2, 0xc3, 0xc5, 0xc6, 0xc7, 0xc9, 0xca, 0xcb, 0xcd,
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0xce, 0xcf,
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].includes(marker) &&
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length >= 8
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)
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return [v.getUint16(at + 5), v.getUint16(at + 3)];
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at += length;
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}
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}
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return null;
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}
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/** Charge each distinct encoded image once against the file's decoded budget. */
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export function createImportImageBudget() {
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const seen = new Set();
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let pixels = 0;
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return (key, bytes) => {
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if (seen.has(key)) return;
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const size = importImageSize(bytes);
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if (
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!size ||
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size.some((n) => !Number.isInteger(n) || n <= 0 || n > MAX_SIDE) ||
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pixels + size[0] * size[1] > MAX_IMPORT_IMAGE_PIXELS
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)
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throw new Error(
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'Local images exceed the decoded image limit or have an unreadable header.',
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);
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pixels += size[0] * size[1];
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seen.add(key);
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};
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}
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