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improve v2 compatibility shim populating metadata

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This commit is contained in:
Brandon Liu
2022-10-05 22:42:07 +08:00
parent 884e980100
commit 3d40ca4501
2 changed files with 62 additions and 35 deletions
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95
js/v2.ts
View File

@@ -1,4 +1,11 @@
import { Source, Header, Cache, RangeResponse, Compression, TileType } from "./index";
import {
Source,
Header,
Cache,
RangeResponse,
Compression,
TileType,
} from "./index";
import { decompressSync } from "fflate";
export const shift = (n: number, shift: number) => {
@@ -190,9 +197,7 @@ export const deriveLeaf = (view: DataView, tile: Zxy): Zxy | null => {
return null;
};
async function getHeaderAndRoot(
source: Source
): Promise<[Header, [string, number, ArrayBuffer]]> {
async function getHeader(source: Source): Promise<Header> {
let resp = await source.getBytes(0, 512000);
const dataview = new DataView(resp.data);
@@ -204,24 +209,42 @@ async function getHeaderAndRoot(
const json_metadata = JSON.parse(
dec.decode(new DataView(resp.data, 10, json_size))
);
// if (json_metadata.compression) {
// }
if (!json_metadata.bounds) {
console.warn(
`Archive is missing 'bounds' in metadata, required in v2 and above.`
);
let tile_compression = Compression.Unknown;
if (json_metadata.compression === "gzip") {
tile_compression = Compression.Gzip;
}
if (!('minzoom' in json_metadata)) {
console.warn(
`Archive is missing 'minzoom' in metadata, required in v2 and above.`
);
let minzoom = 0;
if ("minzoom" in json_metadata) {
minzoom = +json_metadata.minzoom;
}
if (!('maxzoom' in json_metadata)) {
console.warn(
`Archive is missing 'maxzoom' in metadata, required in v2 and above.`
);
let maxzoom = 0;
if ("maxzoom" in json_metadata) {
maxzoom = +json_metadata.maxzoom;
}
let center_lon = 0;
let center_lat = 0;
let center_zoom = 0;
let min_lon = -180.0;
let min_lat = -85.0;
let max_lon = 180.0;
let max_lat = 85.0;
if (json_metadata.bounds) {
let split = json_metadata.bounds.split(",");
min_lon = +split[0];
min_lat = +split[1];
max_lon = +split[2];
max_lat = +split[3];
}
if (json_metadata.center) {
let split = json_metadata.center.split(",");
center_lon = +split[0];
center_lat = +split[1];
center_zoom = +split[2];
}
const header = {
@@ -238,21 +261,21 @@ async function getHeaderAndRoot(
numTileEntries: 0,
numTileContents: 0,
clustered: false,
internalCompression: Compression.Unknown,
tileCompression: Compression.Unknown,
internalCompression: Compression.None,
tileCompression: tile_compression,
tileType: TileType.Mvt,
minZoom: +json_metadata.minzoom,
maxZoom: +json_metadata.maxzoom,
minLon: 0,
minLat: 0,
maxLon: 0,
maxLat: 0,
centerZoom: 0,
centerLon: 0,
centerLat: 0,
minZoom: minzoom,
maxZoom: maxzoom,
minLon: min_lon,
minLat: min_lat,
maxLon: max_lon,
maxLat: max_lat,
centerZoom: center_zoom,
centerLon: center_lon,
centerLat: center_lat,
etag: resp.etag,
};
return [header, ["", 0, new ArrayBuffer(0)]];
return header;
}
async function getZxy(
@@ -310,7 +333,11 @@ async function getZxy(
}
let tile_entry = queryTile(new DataView(leaf_dir), z, x, y);
if (tile_entry) {
let resp = await source.getBytes(tile_entry.offset, tile_entry.length, signal);
let resp = await source.getBytes(
tile_entry.offset,
tile_entry.length,
signal
);
let tile_data = resp.data;
let view = new DataView(tile_data);
@@ -328,6 +355,6 @@ async function getZxy(
}
export default {
getHeaderAndRoot: getHeaderAndRoot,
getHeader: getHeader,
getZxy: getZxy,
};