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Said TurkseverandClaude Opus 5.5
4ea6631425
Trim the doc text this PR adds (README, CHANGELOG, CURRENT-STATE, KNOWN-ISSUES, SECURITY, DATA_SOURCES, .env.example, the CI job comment), drop code comments that restate the code, cut design-note JSDoc to a line or two, and drop review tags from test names. Comments only; no code changes. Also: README key count (seven keys, two metered), CURRENT-STATE's gate paragraph (CI runs a production build with a dummy token), the stacked doc above meshBoxInRange and the orphaned inMeshRange line in coverage.js, and a duplicate ALPR row in DATA_SOURCES that a merge had brought back. Co-Authored-By: Claude Opus 5.5 <[email protected]>
57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
import { PbfReader, PbfWriter } from 'pbf';
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/** Field number of `layers` in a Mapbox Vector Tile, and of `name` in a layer. */
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const TILE_LAYER_FIELD = 3;
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const LAYER_NAME_FIELD = 1;
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/** Read a layer's name without touching its features. */
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function layerName(layerBytes) {
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const pbf = new PbfReader(layerBytes);
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let name = '';
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pbf.readFields((tag, _result, reader) => {
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if (tag !== LAYER_NAME_FIELD) return;
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name = reader.readString();
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reader.pos = reader.length; // the name is all we need
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}, null);
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return name;
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}
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/**
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* Drop whole layers from a vector tile without decoding kept layers, so a
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* 12 MB tile trims in milliseconds. Returns the input when nothing was dropped.
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* @param {Buffer|Uint8Array} bytes
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* @param {Iterable<string>} dropNames
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*/
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export function stripTileLayers(bytes, dropNames) {
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const drop = new Set(dropNames || []);
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if (!bytes?.length || !drop.size) return bytes;
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const reader = new PbfReader(bytes);
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const writer = new PbfWriter();
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let dropped = false;
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reader.readFields((tag, _result, pbf) => {
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if (tag !== TILE_LAYER_FIELD) return;
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const end = pbf.readVarint() + pbf.pos;
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const layerBytes = bytes.subarray(pbf.pos, end);
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pbf.pos = end;
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if (drop.has(layerName(layerBytes))) {
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dropped = true;
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return;
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}
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writer.writeBytesField(TILE_LAYER_FIELD, layerBytes);
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}, null);
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return dropped ? Buffer.from(writer.finish()) : bytes;
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}
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/** Names of the layers inside a vector tile, in order. */
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export function listTileLayers(bytes) {
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const names = [];
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if (!bytes?.length) return names;
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new PbfReader(bytes).readFields((tag, _result, pbf) => {
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if (tag !== TILE_LAYER_FIELD) return;
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const end = pbf.readVarint() + pbf.pos;
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names.push(layerName(bytes.subarray(pbf.pos, end)));
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pbf.pos = end;
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}, null);
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return names;
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}
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