mirror of
https://github.com/protomaps/PMTiles.git
synced 2026-02-04 10:51:07 +00:00
Finish implementation of v2 compatibility shim in v2.ts
This commit is contained in:
Brandon Liu
560
js/index.ts
560
js/index.ts
@@ -1,560 +0,0 @@
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declare const L: any;
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import { decompressSync } from "fflate";
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export const shift = (n: number, shift: number) => {
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return n * Math.pow(2, shift);
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};
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export const unshift = (n: number, shift: number) => {
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return Math.floor(n / Math.pow(2, shift));
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};
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export const getUint24 = (view: DataView, pos: number) => {
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return shift(view.getUint16(pos + 1, true), 8) + view.getUint8(pos);
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};
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export const getUint48 = (view: DataView, pos: number) => {
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return shift(view.getUint32(pos + 2, true), 16) + view.getUint16(pos, true);
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};
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interface Zxy {
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z: number;
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x: number;
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y: number;
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}
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interface Header {
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version: number;
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json_size: number;
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root_entries: number;
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}
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interface Root {
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header: Header;
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dir: DataView;
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view: DataView;
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}
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export interface Entry {
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z: number;
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x: number;
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y: number;
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offset: number;
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length: number;
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is_dir: boolean;
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}
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const compare = (
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tz: number,
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tx: number,
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ty: number,
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view: DataView,
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i: number
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) => {
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if (tz != view.getUint8(i)) return tz - view.getUint8(i);
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const x = getUint24(view, i + 1);
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if (tx != x) return tx - x;
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const y = getUint24(view, i + 4);
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if (ty != y) return ty - y;
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return 0;
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};
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export const queryLeafdir = (
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view: DataView,
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z: number,
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x: number,
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y: number
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): Entry | null => {
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const offset_len = queryView(view, z | 0x80, x, y);
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if (offset_len) {
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return {
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z: z,
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x: x,
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y: y,
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offset: offset_len[0],
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length: offset_len[1],
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is_dir: true,
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};
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}
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return null;
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};
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export const queryTile = (view: DataView, z: number, x: number, y: number) => {
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const offset_len = queryView(view, z, x, y);
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if (offset_len) {
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return {
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z: z,
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x: x,
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y: y,
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offset: offset_len[0],
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length: offset_len[1],
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is_dir: false,
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};
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}
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return null;
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};
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const queryView = (
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view: DataView,
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z: number,
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x: number,
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y: number
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): [number, number] | null => {
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let m = 0;
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let n = view.byteLength / 17 - 1;
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while (m <= n) {
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const k = (n + m) >> 1;
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const cmp = compare(z, x, y, view, k * 17);
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if (cmp > 0) {
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m = k + 1;
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} else if (cmp < 0) {
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n = k - 1;
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} else {
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return [getUint48(view, k * 17 + 7), view.getUint32(k * 17 + 13, true)];
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}
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}
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return null;
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};
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export const queryLeafLevel = (view: DataView): number | null => {
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if (view.byteLength < 17) return null;
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const numEntries = view.byteLength / 17;
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const entry = parseEntry(view, numEntries - 1);
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if (entry.is_dir) return entry.z;
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return null;
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};
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const entrySort = (a: Entry, b: Entry): number => {
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if (a.is_dir && !b.is_dir) {
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return 1;
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}
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if (!a.is_dir && b.is_dir) {
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return -1;
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}
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if (a.z !== b.z) {
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return a.z - b.z;
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}
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if (a.x !== b.x) {
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return a.x - b.x;
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}
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return a.y - b.y;
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};
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export const parseEntry = (dataview: DataView, i: number): Entry => {
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const z_raw = dataview.getUint8(i * 17);
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const z = z_raw & 127;
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return {
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z: z,
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x: getUint24(dataview, i * 17 + 1),
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y: getUint24(dataview, i * 17 + 4),
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offset: getUint48(dataview, i * 17 + 7),
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length: dataview.getUint32(i * 17 + 13, true),
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is_dir: z_raw >> 7 === 1,
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};
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};
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export const sortDir = (dataview: DataView): DataView => {
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const entries: Entry[] = [];
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for (let i = 0; i < dataview.byteLength / 17; i++) {
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entries.push(parseEntry(dataview, i));
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}
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return createDirectory(entries);
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};
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export const createDirectory = (entries: Entry[]): DataView => {
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entries.sort(entrySort);
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const buffer = new ArrayBuffer(17 * entries.length);
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const arr = new Uint8Array(buffer);
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for (let i = 0; i < entries.length; i++) {
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const entry = entries[i];
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let z = entry.z;
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if (entry.is_dir) z = z | 0x80;
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arr[i * 17] = z;
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arr[i * 17 + 1] = entry.x & 0xff;
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arr[i * 17 + 2] = (entry.x >> 8) & 0xff;
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arr[i * 17 + 3] = (entry.x >> 16) & 0xff;
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arr[i * 17 + 4] = entry.y & 0xff;
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arr[i * 17 + 5] = (entry.y >> 8) & 0xff;
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arr[i * 17 + 6] = (entry.y >> 16) & 0xff;
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arr[i * 17 + 7] = entry.offset & 0xff;
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arr[i * 17 + 8] = unshift(entry.offset, 8) & 0xff;
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arr[i * 17 + 9] = unshift(entry.offset, 16) & 0xff;
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arr[i * 17 + 10] = unshift(entry.offset, 24) & 0xff;
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arr[i * 17 + 11] = unshift(entry.offset, 32) & 0xff;
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arr[i * 17 + 12] = unshift(entry.offset, 48) & 0xff;
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arr[i * 17 + 13] = entry.length & 0xff;
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arr[i * 17 + 14] = (entry.length >> 8) & 0xff;
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arr[i * 17 + 15] = (entry.length >> 16) & 0xff;
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arr[i * 17 + 16] = (entry.length >> 24) & 0xff;
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}
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return new DataView(arr.buffer, arr.byteOffset, arr.length);
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};
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export const deriveLeaf = (root: Root, tile: Zxy): Zxy | null => {
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const leaf_level = queryLeafLevel(root.dir);
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if (leaf_level) {
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const level_diff = tile.z - leaf_level;
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const leaf_x = Math.trunc(tile.x / (1 << level_diff));
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const leaf_y = Math.trunc(tile.y / (1 << level_diff));
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return { z: leaf_level, x: leaf_x, y: leaf_y };
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}
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return null;
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};
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export const parseHeader = (dataview: DataView): Header => {
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const magic = dataview.getUint16(0, true);
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if (magic !== 19792) {
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throw new Error('File header does not begin with "PM"');
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}
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const version = dataview.getUint16(2, true);
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const json_size = dataview.getUint32(4, true);
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const root_entries = dataview.getUint16(8, true);
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return {
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version: version,
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json_size: json_size,
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root_entries: root_entries,
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};
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};
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export interface Source {
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getBytes: (offset: number, length: number) => Promise<DataView>;
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getKey: () => string;
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}
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export class FileSource implements Source {
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file: File;
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constructor(file: File) {
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this.file = file;
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}
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getKey() {
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return this.file.name;
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}
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async getBytes(offset: number, length: number) {
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let blob = this.file.slice(offset, offset + length);
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let a = await blob.arrayBuffer();
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return new DataView(a);
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}
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}
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export class FetchSource implements Source {
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url: string;
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constructor(url: string) {
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this.url = url;
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}
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getKey() {
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return this.url;
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}
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async getBytes(offset: number, length: number) {
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const controller = new AbortController();
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const signal = controller.signal;
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const resp = await fetch(this.url, {
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signal: signal,
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headers: { Range: "bytes=" + offset + "-" + (offset + length - 1) },
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});
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const contentLength = resp.headers.get("Content-Length");
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if (!contentLength || +contentLength !== length) {
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console.error(
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"Content-Length mismatch indicates byte serving not supported; aborting."
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);
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controller.abort();
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}
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const a = await resp.arrayBuffer();
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return new DataView(a);
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}
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}
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interface CacheEntry {
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lastUsed: number;
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buffer: Promise<DataView>;
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}
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export class LRUCacheSource implements Source {
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entries: Map<string, CacheEntry>;
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maxEntries: number;
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source: Source;
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constructor(source: Source, maxEntries: number) {
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this.source = source;
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this.entries = new Map<string, CacheEntry>();
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this.maxEntries = maxEntries;
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}
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getKey = () => {
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return this.source.getKey();
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};
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async getBytes(offset: number, length: number) {
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let val = this.entries.get(offset + "-" + length);
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if (val) {
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val.lastUsed = performance.now();
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return val.buffer;
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}
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let promise = this.source.getBytes(offset, length);
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this.entries.set(offset + "-" + length, {
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lastUsed: performance.now(),
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buffer: promise,
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});
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if (this.entries.size > this.maxEntries) {
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let minUsed = Infinity;
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let minKey = undefined;
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this.entries.forEach((val, key) => {
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if (val.lastUsed < minUsed) {
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minUsed = val.lastUsed;
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minKey = key;
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}
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});
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if (minKey) this.entries.delete(minKey);
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}
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return promise;
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}
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}
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export class PMTiles {
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source: Source;
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constructor(source: string | Source, maxLeaves = 64) {
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if (typeof source === "string") {
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this.source = new LRUCacheSource(new FetchSource(source), maxLeaves);
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} else {
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this.source = source;
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}
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}
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async fetchRoot(): Promise<Root> {
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const v = await this.source.getBytes(0, 512000);
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const header = parseHeader(new DataView(v.buffer, v.byteOffset, 10));
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let root_dir = new DataView(
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v.buffer,
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10 + header.json_size,
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17 * header.root_entries
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);
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if (header.version === 1) {
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console.warn("Sorting pmtiles v1 directory");
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root_dir = sortDir(root_dir);
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}
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return {
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header: header,
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view: v,
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dir: root_dir,
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};
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}
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async root_entries(): Promise<Entry[]> {
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const root = await this.fetchRoot();
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let entries = [];
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for (var i = 0; i < root.header.root_entries; i++) {
|
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entries.push(parseEntry(root.dir, i));
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}
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return entries;
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}
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async metadata(): Promise<any> {
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const root = await this.fetchRoot();
|
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const dec = new TextDecoder("utf-8");
|
||||
const result = JSON.parse(
|
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dec.decode(
|
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new DataView(
|
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root.view.buffer,
|
||||
root.view.byteOffset + 10,
|
||||
root.header.json_size
|
||||
)
|
||||
)
|
||||
);
|
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if (result.compression) {
|
||||
console.warn(
|
||||
`Archive has compression type: ${result.compression} and may not be readable directly by browsers.`
|
||||
);
|
||||
}
|
||||
if (!result.bounds) {
|
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console.warn(
|
||||
`Archive is missing 'bounds' in metadata, required in v2 and above.`
|
||||
);
|
||||
}
|
||||
if (!result.minzoom) {
|
||||
console.warn(
|
||||
`Archive is missing 'minzoom' in metadata, required in v2 and above.`
|
||||
);
|
||||
}
|
||||
if (!result.maxzoom) {
|
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console.warn(
|
||||
`Archive is missing 'maxzoom' in metadata, required in v2 and above.`
|
||||
);
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
async fetchLeafdir(version: number, entry: Entry): Promise<DataView> {
|
||||
let buf = await this.source.getBytes(entry.offset, entry.length);
|
||||
|
||||
if (version === 1) {
|
||||
console.warn("Sorting pmtiles v1 directory.");
|
||||
buf = sortDir(buf);
|
||||
}
|
||||
|
||||
return buf;
|
||||
}
|
||||
|
||||
async getLeafdir(version: number, entry: Entry): Promise<DataView> {
|
||||
return this.fetchLeafdir(version, entry);
|
||||
}
|
||||
|
||||
async getZxy(z: number, x: number, y: number): Promise<Entry | null> {
|
||||
const root = await this.fetchRoot();
|
||||
const entry = queryTile(
|
||||
new DataView(root.dir.buffer, root.dir.byteOffset, root.dir.byteLength),
|
||||
z,
|
||||
x,
|
||||
y
|
||||
);
|
||||
if (entry) return entry;
|
||||
|
||||
const leafcoords = deriveLeaf(root, { z: z, x: x, y: y });
|
||||
if (leafcoords) {
|
||||
const leafdir_entry = queryLeafdir(
|
||||
new DataView(root.dir.buffer, root.dir.byteOffset, root.dir.byteLength),
|
||||
leafcoords.z,
|
||||
leafcoords.x,
|
||||
leafcoords.y
|
||||
);
|
||||
if (leafdir_entry) {
|
||||
const leafdir = await this.getLeafdir(
|
||||
root.header.version,
|
||||
leafdir_entry
|
||||
);
|
||||
return queryTile(
|
||||
new DataView(leafdir.buffer, leafdir.byteOffset, leafdir.byteLength),
|
||||
z,
|
||||
x,
|
||||
y
|
||||
);
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
export const leafletLayer = (source: PMTiles, options: any) => {
|
||||
const cls = L.GridLayer.extend({
|
||||
createTile: function (coord: any, done: any) {
|
||||
const tile: any = document.createElement("img");
|
||||
source.getZxy(coord.z, coord.x, coord.y).then((result) => {
|
||||
if (result === null) return;
|
||||
|
||||
const controller = new AbortController();
|
||||
const signal = controller.signal;
|
||||
tile.cancel = () => {
|
||||
controller.abort();
|
||||
};
|
||||
|
||||
source.source
|
||||
.getBytes(result.offset, result.length)
|
||||
.then((buf) => {
|
||||
const blob = new Blob([buf], { type: "image/png" });
|
||||
const imageUrl = window.URL.createObjectURL(blob);
|
||||
tile.src = imageUrl;
|
||||
tile.cancel = null;
|
||||
done(null, tile);
|
||||
})
|
||||
.catch((error) => {
|
||||
if (error.name !== "AbortError") throw error;
|
||||
});
|
||||
});
|
||||
return tile;
|
||||
},
|
||||
|
||||
_removeTile: function (key: string) {
|
||||
const tile = this._tiles[key];
|
||||
if (!tile) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (tile.el.cancel) tile.el.cancel();
|
||||
|
||||
tile.el.width = 0;
|
||||
tile.el.height = 0;
|
||||
tile.el.deleted = true;
|
||||
L.DomUtil.remove(tile.el);
|
||||
delete this._tiles[key];
|
||||
this.fire("tileunload", {
|
||||
tile: tile.el,
|
||||
coords: this._keyToTileCoords(key),
|
||||
});
|
||||
},
|
||||
});
|
||||
return new cls(options);
|
||||
};
|
||||
|
||||
export class ProtocolCache {
|
||||
tiles: Map<string, PMTiles>;
|
||||
|
||||
constructor() {
|
||||
this.tiles = new Map<string, PMTiles>();
|
||||
}
|
||||
|
||||
add(p: PMTiles) {
|
||||
this.tiles.set(p.source.getKey(), p);
|
||||
}
|
||||
|
||||
get(url: string) {
|
||||
return this.tiles.get(url);
|
||||
}
|
||||
|
||||
protocol = (params: any, callback: any) => {
|
||||
const re = new RegExp(/pmtiles:\/\/(.+)\/(\d+)\/(\d+)\/(\d+)/);
|
||||
const result = params.url.match(re);
|
||||
const pmtiles_url = result[1];
|
||||
|
||||
let instance = this.tiles.get(pmtiles_url);
|
||||
if (!instance) {
|
||||
instance = new PMTiles(pmtiles_url);
|
||||
this.tiles.set(pmtiles_url, instance);
|
||||
}
|
||||
const z = result[2];
|
||||
const x = result[3];
|
||||
const y = result[4];
|
||||
let cancel = () => {};
|
||||
|
||||
instance.getZxy(+z, +x, +y).then((val) => {
|
||||
if (val) {
|
||||
instance!.source
|
||||
.getBytes(val.offset, val.length)
|
||||
.then((arr) => {
|
||||
let data = new Uint8Array(arr.buffer);
|
||||
if (data[0] == 0x1f && data[1] == 0x8b) {
|
||||
data = decompressSync(data);
|
||||
}
|
||||
callback(null, data, null, null);
|
||||
})
|
||||
.catch((e) => {
|
||||
callback(new Error("Canceled"), null, null, null);
|
||||
});
|
||||
} else {
|
||||
callback(null, new Uint8Array(), null, null);
|
||||
}
|
||||
});
|
||||
return {
|
||||
cancel: () => {
|
||||
cancel();
|
||||
},
|
||||
};
|
||||
};
|
||||
}
|
||||
325
js/v2.ts
325
js/v2.ts
@@ -1,25 +1,248 @@
|
||||
import { Header, Cache, RangeResponse } from './v3';
|
||||
import { Source, Header, Cache, RangeResponse, Compression } from "./v3";
|
||||
import { decompressSync } from "fflate";
|
||||
|
||||
export const shift = (n: number, shift: number) => {
|
||||
return n * Math.pow(2, shift);
|
||||
};
|
||||
|
||||
export const unshift = (n: number, shift: number) => {
|
||||
return Math.floor(n / Math.pow(2, shift));
|
||||
};
|
||||
|
||||
export const getUint24 = (view: DataView, pos: number) => {
|
||||
return shift(view.getUint16(pos + 1, true), 8) + view.getUint8(pos);
|
||||
};
|
||||
|
||||
export const getUint48 = (view: DataView, pos: number) => {
|
||||
return shift(view.getUint32(pos + 2, true), 16) + view.getUint16(pos, true);
|
||||
};
|
||||
|
||||
interface Zxy {
|
||||
z: number;
|
||||
x: number;
|
||||
y: number;
|
||||
}
|
||||
|
||||
export interface EntryV2 {
|
||||
z: number;
|
||||
x: number;
|
||||
y: number;
|
||||
offset: number;
|
||||
length: number;
|
||||
is_dir: boolean;
|
||||
}
|
||||
|
||||
const compare = (
|
||||
tz: number,
|
||||
tx: number,
|
||||
ty: number,
|
||||
view: DataView,
|
||||
i: number
|
||||
) => {
|
||||
if (tz != view.getUint8(i)) return tz - view.getUint8(i);
|
||||
const x = getUint24(view, i + 1);
|
||||
if (tx != x) return tx - x;
|
||||
const y = getUint24(view, i + 4);
|
||||
if (ty != y) return ty - y;
|
||||
return 0;
|
||||
};
|
||||
|
||||
export const queryLeafdir = (
|
||||
view: DataView,
|
||||
z: number,
|
||||
x: number,
|
||||
y: number
|
||||
): EntryV2 | null => {
|
||||
const offset_len = queryView(view, z | 0x80, x, y);
|
||||
if (offset_len) {
|
||||
return {
|
||||
z: z,
|
||||
x: x,
|
||||
y: y,
|
||||
offset: offset_len[0],
|
||||
length: offset_len[1],
|
||||
is_dir: true,
|
||||
};
|
||||
}
|
||||
return null;
|
||||
};
|
||||
|
||||
export const queryTile = (view: DataView, z: number, x: number, y: number) => {
|
||||
const offset_len = queryView(view, z, x, y);
|
||||
if (offset_len) {
|
||||
return {
|
||||
z: z,
|
||||
x: x,
|
||||
y: y,
|
||||
offset: offset_len[0],
|
||||
length: offset_len[1],
|
||||
is_dir: false,
|
||||
};
|
||||
}
|
||||
return null;
|
||||
};
|
||||
|
||||
const queryView = (
|
||||
view: DataView,
|
||||
z: number,
|
||||
x: number,
|
||||
y: number
|
||||
): [number, number] | null => {
|
||||
let m = 0;
|
||||
let n = view.byteLength / 17 - 1;
|
||||
while (m <= n) {
|
||||
const k = (n + m) >> 1;
|
||||
const cmp = compare(z, x, y, view, k * 17);
|
||||
if (cmp > 0) {
|
||||
m = k + 1;
|
||||
} else if (cmp < 0) {
|
||||
n = k - 1;
|
||||
} else {
|
||||
return [getUint48(view, k * 17 + 7), view.getUint32(k * 17 + 13, true)];
|
||||
}
|
||||
}
|
||||
return null;
|
||||
};
|
||||
|
||||
const entrySort = (a: EntryV2, b: EntryV2): number => {
|
||||
if (a.is_dir && !b.is_dir) {
|
||||
return 1;
|
||||
}
|
||||
if (!a.is_dir && b.is_dir) {
|
||||
return -1;
|
||||
}
|
||||
if (a.z !== b.z) {
|
||||
return a.z - b.z;
|
||||
}
|
||||
if (a.x !== b.x) {
|
||||
return a.x - b.x;
|
||||
}
|
||||
return a.y - b.y;
|
||||
};
|
||||
|
||||
export const parseEntry = (dataview: DataView, i: number): EntryV2 => {
|
||||
const z_raw = dataview.getUint8(i * 17);
|
||||
const z = z_raw & 127;
|
||||
return {
|
||||
z: z,
|
||||
x: getUint24(dataview, i * 17 + 1),
|
||||
y: getUint24(dataview, i * 17 + 4),
|
||||
offset: getUint48(dataview, i * 17 + 7),
|
||||
length: dataview.getUint32(i * 17 + 13, true),
|
||||
is_dir: z_raw >> 7 === 1,
|
||||
};
|
||||
};
|
||||
|
||||
export const sortDir = (a: ArrayBuffer): ArrayBuffer => {
|
||||
const entries: EntryV2[] = [];
|
||||
const view = new DataView(a);
|
||||
for (let i = 0; i < view.byteLength / 17; i++) {
|
||||
entries.push(parseEntry(view, i));
|
||||
}
|
||||
return createDirectory(entries);
|
||||
};
|
||||
|
||||
export const createDirectory = (entries: EntryV2[]): ArrayBuffer => {
|
||||
entries.sort(entrySort);
|
||||
|
||||
const buffer = new ArrayBuffer(17 * entries.length);
|
||||
const arr = new Uint8Array(buffer);
|
||||
for (let i = 0; i < entries.length; i++) {
|
||||
const entry = entries[i];
|
||||
let z = entry.z;
|
||||
if (entry.is_dir) z = z | 0x80;
|
||||
arr[i * 17] = z;
|
||||
|
||||
arr[i * 17 + 1] = entry.x & 0xff;
|
||||
arr[i * 17 + 2] = (entry.x >> 8) & 0xff;
|
||||
arr[i * 17 + 3] = (entry.x >> 16) & 0xff;
|
||||
|
||||
arr[i * 17 + 4] = entry.y & 0xff;
|
||||
arr[i * 17 + 5] = (entry.y >> 8) & 0xff;
|
||||
arr[i * 17 + 6] = (entry.y >> 16) & 0xff;
|
||||
|
||||
arr[i * 17 + 7] = entry.offset & 0xff;
|
||||
arr[i * 17 + 8] = unshift(entry.offset, 8) & 0xff;
|
||||
arr[i * 17 + 9] = unshift(entry.offset, 16) & 0xff;
|
||||
arr[i * 17 + 10] = unshift(entry.offset, 24) & 0xff;
|
||||
arr[i * 17 + 11] = unshift(entry.offset, 32) & 0xff;
|
||||
arr[i * 17 + 12] = unshift(entry.offset, 48) & 0xff;
|
||||
|
||||
arr[i * 17 + 13] = entry.length & 0xff;
|
||||
arr[i * 17 + 14] = (entry.length >> 8) & 0xff;
|
||||
arr[i * 17 + 15] = (entry.length >> 16) & 0xff;
|
||||
arr[i * 17 + 16] = (entry.length >> 24) & 0xff;
|
||||
}
|
||||
return buffer;
|
||||
};
|
||||
|
||||
export const deriveLeaf = (view: DataView, tile: Zxy): Zxy | null => {
|
||||
if (view.byteLength < 17) return null;
|
||||
const numEntries = view.byteLength / 17;
|
||||
const entry = parseEntry(view, numEntries - 1);
|
||||
if (entry.is_dir) {
|
||||
let leaf_level = entry.z;
|
||||
const level_diff = tile.z - leaf_level;
|
||||
const leaf_x = Math.trunc(tile.x / (1 << level_diff));
|
||||
const leaf_y = Math.trunc(tile.y / (1 << level_diff));
|
||||
return { z: leaf_level, x: leaf_x, y: leaf_y };
|
||||
}
|
||||
return null;
|
||||
};
|
||||
|
||||
async function getHeaderAndRoot(
|
||||
source: Source
|
||||
): Promise<[Header, [string, number, ArrayBuffer]]> {
|
||||
let resp = await source.getBytes(0, 512000);
|
||||
|
||||
const dataview = new DataView(resp.data);
|
||||
|
||||
const json_size = dataview.getUint32(4, true);
|
||||
const root_entries = dataview.getUint16(8, true);
|
||||
|
||||
const dec = new TextDecoder("utf-8");
|
||||
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.`
|
||||
);
|
||||
}
|
||||
if (!json_metadata.minzoom) {
|
||||
console.warn(
|
||||
`Archive is missing 'minzoom' in metadata, required in v2 and above.`
|
||||
);
|
||||
}
|
||||
if (!json_metadata.maxzoom) {
|
||||
console.warn(
|
||||
`Archive is missing 'maxzoom' in metadata, required in v2 and above.`
|
||||
);
|
||||
}
|
||||
|
||||
async function getHeaderAndRoot(a:ArrayBuffer, etag?:string): Promise<[Header, [string, number, ArrayBuffer]]> {
|
||||
const header = {
|
||||
specVersion: 2,
|
||||
rootDirectoryOffset: 0,
|
||||
rootDirectoryLength: 0,
|
||||
jsonMetadataOffset: 0,
|
||||
jsonMetadataLength: 0,
|
||||
specVersion: dataview.getUint16(2, true),
|
||||
rootDirectoryOffset: 10 + json_size,
|
||||
rootDirectoryLength: root_entries * 17,
|
||||
jsonMetadataOffset: 10,
|
||||
jsonMetadataLength: json_size,
|
||||
leafDirectoryOffset: 0,
|
||||
leafDirectoryLength: undefined,
|
||||
tileDataOffset: 512000,
|
||||
tileDataOffset: 0,
|
||||
tileDataLength: undefined,
|
||||
numAddressedTiles: 0,
|
||||
numTileEntries: 0,
|
||||
numTileContents: 0,
|
||||
clustered: false,
|
||||
internalCompression: 0,
|
||||
internalCompression: Compression.Unknown,
|
||||
tileCompression: 0,
|
||||
tileType: 0,
|
||||
minZoom: 0,
|
||||
maxZoom: 0,
|
||||
minZoom: +json_metadata.minzoom,
|
||||
maxZoom: +json_metadata.maxzoom,
|
||||
minLon: 0,
|
||||
minLat: 0,
|
||||
maxLon: 0,
|
||||
@@ -27,17 +250,83 @@ async function getHeaderAndRoot(a:ArrayBuffer, etag?:string): Promise<[Header, [
|
||||
centerZoom: 0,
|
||||
centerLon: 0,
|
||||
centerLat: 0,
|
||||
etag: etag,
|
||||
};
|
||||
return [header, ["",0,new ArrayBuffer(0)]];
|
||||
etag: resp.etag,
|
||||
};
|
||||
return [header, ["", 0, new ArrayBuffer(0)]];
|
||||
}
|
||||
|
||||
async function getZxy(header:Header,cache:Cache): Promise<RangeResponse | undefined> {
|
||||
return Promise.resolve(undefined);
|
||||
async function getZxy(
|
||||
header: Header,
|
||||
source: Source,
|
||||
cache: Cache,
|
||||
z: number,
|
||||
x: number,
|
||||
y: number
|
||||
): Promise<RangeResponse | undefined> {
|
||||
let root_dir = await cache.getArrayBuffer(
|
||||
source,
|
||||
header.rootDirectoryOffset,
|
||||
header.rootDirectoryLength,
|
||||
header
|
||||
);
|
||||
if (header.specVersion === 1) {
|
||||
root_dir = sortDir(root_dir);
|
||||
}
|
||||
|
||||
const entry = queryTile(new DataView(root_dir), z, x, y);
|
||||
if (entry) {
|
||||
let resp = await source.getBytes(entry.offset, entry.length); // TODO signal
|
||||
let tile_data = resp.data;
|
||||
|
||||
let view = new DataView(tile_data);
|
||||
if (view.getUint8(0) == 0x1f && view.getUint8(1) == 0x8b) {
|
||||
tile_data = decompressSync(new Uint8Array(tile_data));
|
||||
}
|
||||
|
||||
return {
|
||||
data: tile_data,
|
||||
};
|
||||
}
|
||||
const leafcoords = deriveLeaf(new DataView(root_dir), { z: z, x: x, y: y });
|
||||
|
||||
if (leafcoords) {
|
||||
const leafdir_entry = queryLeafdir(
|
||||
new DataView(root_dir),
|
||||
leafcoords.z,
|
||||
leafcoords.x,
|
||||
leafcoords.y
|
||||
);
|
||||
if (leafdir_entry) {
|
||||
let leaf_dir = await cache.getArrayBuffer(
|
||||
source,
|
||||
leafdir_entry.offset,
|
||||
leafdir_entry.length,
|
||||
header
|
||||
);
|
||||
|
||||
if (header.specVersion === 1) {
|
||||
leaf_dir = sortDir(leaf_dir);
|
||||
}
|
||||
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); // TODO signal
|
||||
let tile_data = resp.data;
|
||||
|
||||
let view = new DataView(tile_data);
|
||||
if (view.getUint8(0) == 0x1f && view.getUint8(1) == 0x8b) {
|
||||
tile_data = decompressSync(new Uint8Array(tile_data));
|
||||
}
|
||||
return {
|
||||
data: tile_data,
|
||||
};
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return undefined;
|
||||
}
|
||||
|
||||
export default {
|
||||
getHeaderAndRoot: getHeaderAndRoot,
|
||||
getZxy: getZxy
|
||||
getZxy: getZxy,
|
||||
};
|
||||
|
||||
|
||||
37
js/v3.ts
37
js/v3.ts
@@ -132,7 +132,7 @@ export interface Entry {
|
||||
|
||||
const ENTRY_SIZE_BYTES = 32;
|
||||
|
||||
enum Compression {
|
||||
export enum Compression {
|
||||
None = 0,
|
||||
Gzip = 1,
|
||||
Brotli = 2,
|
||||
@@ -299,9 +299,6 @@ export class FetchSource implements Source {
|
||||
|
||||
export function bytesToHeader(bytes: ArrayBuffer, etag?: string): Header {
|
||||
const v = new DataView(bytes);
|
||||
if (v.getUint16(0, true) !== 0x4d50) {
|
||||
throw new Error("Wrong magic number for PMTiles archive");
|
||||
}
|
||||
return {
|
||||
specVersion: 3,
|
||||
rootDirectoryOffset: Number(v.getBigUint64(3, true)),
|
||||
@@ -366,6 +363,14 @@ function deserializeIndex(buffer: ArrayBuffer): Entry[] {
|
||||
}
|
||||
|
||||
function detectVersion(a: ArrayBuffer): number {
|
||||
const v = new DataView(a);
|
||||
if (v.getUint16(2, true) === 2) {
|
||||
console.warn("PMTiles spec version 2 has been deprecated;");
|
||||
return 2;
|
||||
} else if (v.getUint16(2, true) === 1) {
|
||||
console.warn("PMTiles spec version 1 has been deprecated;");
|
||||
return 1;
|
||||
}
|
||||
return 3;
|
||||
}
|
||||
|
||||
@@ -394,9 +399,14 @@ async function getHeaderAndRoot(
|
||||
): Promise<[Header, [string, number, Entry[] | ArrayBuffer]?]> {
|
||||
let resp = await source.getBytes(0, 16384);
|
||||
|
||||
const v = new DataView(resp.data);
|
||||
if (v.getUint16(0, true) !== 0x4d50) {
|
||||
throw new Error("Wrong magic number for PMTiles archive");
|
||||
}
|
||||
|
||||
// V2 COMPATIBILITY
|
||||
if (detectVersion(resp.data) < 2) {
|
||||
return v2.getHeaderAndRoot(resp.data, resp.etag);
|
||||
if (detectVersion(resp.data) < 3) {
|
||||
return v2.getHeaderAndRoot(source);
|
||||
}
|
||||
|
||||
const headerData = resp.data.slice(0, HEADER_SIZE_BYTES);
|
||||
@@ -728,8 +738,12 @@ export class PMTiles {
|
||||
source: Source;
|
||||
cache: Cache;
|
||||
|
||||
constructor(source: Source, cache?: Cache) {
|
||||
this.source = source;
|
||||
constructor(source: Source | string, cache?: Cache) {
|
||||
if (typeof source === "string") {
|
||||
this.source = new FetchSource(source);
|
||||
} else {
|
||||
this.source = source;
|
||||
}
|
||||
if (cache) {
|
||||
this.cache = cache;
|
||||
} else {
|
||||
@@ -739,6 +753,11 @@ export class PMTiles {
|
||||
|
||||
async root_entries() {
|
||||
const header = await this.cache.getHeader(this.source);
|
||||
|
||||
// V2 COMPATIBILITY
|
||||
if (header.specVersion < 3) {
|
||||
return [];
|
||||
}
|
||||
let d_o = header.rootDirectoryOffset;
|
||||
let d_l = header.rootDirectoryLength;
|
||||
return await this.cache.getDirectory(this.source, d_o, d_l, header);
|
||||
@@ -759,7 +778,7 @@ export class PMTiles {
|
||||
|
||||
// V2 COMPATIBILITY
|
||||
if (header.specVersion < 3) {
|
||||
return v2.getZxy(header, this.cache);
|
||||
return v2.getZxy(header, this.source, this.cache, z, x, y);
|
||||
}
|
||||
|
||||
if (z < header.minZoom || z > header.maxZoom) {
|
||||
|
||||
Reference in New Issue
Block a user