mirror of
https://github.com/protomaps/PMTiles.git
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add prettierrc config file
This commit is contained in:
Logan Houp
556
js/v2.ts
556
js/v2.ts
@@ -1,360 +1,360 @@
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import {
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Source,
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Header,
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Cache,
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RangeResponse,
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Compression,
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TileType,
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Source,
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Header,
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Cache,
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RangeResponse,
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Compression,
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TileType,
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} from "./index";
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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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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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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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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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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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z: number;
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x: number;
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y: number;
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}
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export interface EntryV2 {
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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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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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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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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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view: DataView,
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z: number,
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x: number,
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y: number
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): EntryV2 | 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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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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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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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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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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const entrySort = (a: EntryV2, b: EntryV2): 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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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): EntryV2 => {
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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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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 = (a: ArrayBuffer): ArrayBuffer => {
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const entries: EntryV2[] = [];
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const view = new DataView(a);
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for (let i = 0; i < view.byteLength / 17; i++) {
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entries.push(parseEntry(view, i));
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}
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return createDirectory(entries);
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const entries: EntryV2[] = [];
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const view = new DataView(a);
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for (let i = 0; i < view.byteLength / 17; i++) {
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entries.push(parseEntry(view, i));
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}
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return createDirectory(entries);
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};
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export const createDirectory = (entries: EntryV2[]): ArrayBuffer => {
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entries.sort(entrySort);
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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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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 + 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 + 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 + 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 buffer;
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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 buffer;
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};
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export const deriveLeaf = (view: DataView, tile: Zxy): Zxy | 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) {
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const leaf_level = entry.z;
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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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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) {
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const leaf_level = entry.z;
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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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async function getHeader(source: Source): Promise<Header> {
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const resp = await source.getBytes(0, 512000);
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const resp = await source.getBytes(0, 512000);
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const dataview = new DataView(resp.data);
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const dataview = new DataView(resp.data);
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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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const json_size = dataview.getUint32(4, true);
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const root_entries = dataview.getUint16(8, true);
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const dec = new TextDecoder("utf-8");
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const json_metadata = JSON.parse(
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dec.decode(new DataView(resp.data, 10, json_size))
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);
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let tile_compression = Compression.Unknown;
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if (json_metadata.compression === "gzip") {
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tile_compression = Compression.Gzip;
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}
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const dec = new TextDecoder("utf-8");
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const json_metadata = JSON.parse(
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dec.decode(new DataView(resp.data, 10, json_size))
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);
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let tile_compression = Compression.Unknown;
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if (json_metadata.compression === "gzip") {
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tile_compression = Compression.Gzip;
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}
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let minzoom = 0;
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if ("minzoom" in json_metadata) {
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minzoom = +json_metadata.minzoom;
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}
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let minzoom = 0;
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if ("minzoom" in json_metadata) {
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minzoom = +json_metadata.minzoom;
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}
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let maxzoom = 0;
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if ("maxzoom" in json_metadata) {
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maxzoom = +json_metadata.maxzoom;
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}
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let maxzoom = 0;
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if ("maxzoom" in json_metadata) {
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maxzoom = +json_metadata.maxzoom;
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}
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let center_lon = 0;
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let center_lat = 0;
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let center_zoom = 0;
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let min_lon = -180.0;
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let min_lat = -85.0;
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let max_lon = 180.0;
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let max_lat = 85.0;
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let center_lon = 0;
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let center_lat = 0;
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let center_zoom = 0;
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let min_lon = -180.0;
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let min_lat = -85.0;
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let max_lon = 180.0;
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let max_lat = 85.0;
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if (json_metadata.bounds) {
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const split = json_metadata.bounds.split(",");
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min_lon = +split[0];
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min_lat = +split[1];
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max_lon = +split[2];
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max_lat = +split[3];
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}
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if (json_metadata.bounds) {
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const split = json_metadata.bounds.split(",");
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min_lon = +split[0];
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min_lat = +split[1];
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max_lon = +split[2];
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||||
max_lat = +split[3];
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||||
}
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||||
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||||
if (json_metadata.center) {
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const split = json_metadata.center.split(",");
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||||
center_lon = +split[0];
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||||
center_lat = +split[1];
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center_zoom = +split[2];
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}
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if (json_metadata.center) {
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const split = json_metadata.center.split(",");
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center_lon = +split[0];
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||||
center_lat = +split[1];
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center_zoom = +split[2];
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}
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||||
const header = {
|
||||
specVersion: dataview.getUint16(2, true),
|
||||
rootDirectoryOffset: 10 + json_size,
|
||||
rootDirectoryLength: root_entries * 17,
|
||||
jsonMetadataOffset: 10,
|
||||
jsonMetadataLength: json_size,
|
||||
leafDirectoryOffset: 0,
|
||||
leafDirectoryLength: undefined,
|
||||
tileDataOffset: 0,
|
||||
tileDataLength: undefined,
|
||||
numAddressedTiles: 0,
|
||||
numTileEntries: 0,
|
||||
numTileContents: 0,
|
||||
clustered: false,
|
||||
internalCompression: Compression.None,
|
||||
tileCompression: tile_compression,
|
||||
tileType: TileType.Mvt,
|
||||
minZoom: minzoom,
|
||||
maxZoom: maxzoom,
|
||||
minLon: min_lon,
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||||
minLat: min_lat,
|
||||
maxLon: max_lon,
|
||||
maxLat: max_lat,
|
||||
centerZoom: center_zoom,
|
||||
centerLon: center_lon,
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||||
centerLat: center_lat,
|
||||
etag: resp.etag,
|
||||
};
|
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return header;
|
||||
const header = {
|
||||
specVersion: dataview.getUint16(2, true),
|
||||
rootDirectoryOffset: 10 + json_size,
|
||||
rootDirectoryLength: root_entries * 17,
|
||||
jsonMetadataOffset: 10,
|
||||
jsonMetadataLength: json_size,
|
||||
leafDirectoryOffset: 0,
|
||||
leafDirectoryLength: undefined,
|
||||
tileDataOffset: 0,
|
||||
tileDataLength: undefined,
|
||||
numAddressedTiles: 0,
|
||||
numTileEntries: 0,
|
||||
numTileContents: 0,
|
||||
clustered: false,
|
||||
internalCompression: Compression.None,
|
||||
tileCompression: tile_compression,
|
||||
tileType: TileType.Mvt,
|
||||
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;
|
||||
}
|
||||
|
||||
async function getZxy(
|
||||
header: Header,
|
||||
source: Source,
|
||||
cache: Cache,
|
||||
z: number,
|
||||
x: number,
|
||||
y: number,
|
||||
signal?: AbortSignal
|
||||
header: Header,
|
||||
source: Source,
|
||||
cache: Cache,
|
||||
z: number,
|
||||
x: number,
|
||||
y: number,
|
||||
signal?: AbortSignal
|
||||
): Promise<RangeResponse | undefined> {
|
||||
let root_dir = await cache.getArrayBuffer(
|
||||
source,
|
||||
header.rootDirectoryOffset,
|
||||
header.rootDirectoryLength,
|
||||
header
|
||||
);
|
||||
if (header.specVersion === 1) {
|
||||
root_dir = sortDir(root_dir);
|
||||
}
|
||||
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) {
|
||||
const resp = await source.getBytes(entry.offset, entry.length, signal);
|
||||
let tile_data = resp.data;
|
||||
const entry = queryTile(new DataView(root_dir), z, x, y);
|
||||
if (entry) {
|
||||
const resp = await source.getBytes(entry.offset, entry.length, signal);
|
||||
let tile_data = resp.data;
|
||||
|
||||
const view = new DataView(tile_data);
|
||||
if (view.getUint8(0) == 0x1f && view.getUint8(1) == 0x8b) {
|
||||
tile_data = decompressSync(new Uint8Array(tile_data));
|
||||
}
|
||||
const 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 });
|
||||
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 (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);
|
||||
}
|
||||
const tile_entry = queryTile(new DataView(leaf_dir), z, x, y);
|
||||
if (tile_entry) {
|
||||
const resp = await source.getBytes(
|
||||
tile_entry.offset,
|
||||
tile_entry.length,
|
||||
signal
|
||||
);
|
||||
let tile_data = resp.data;
|
||||
if (header.specVersion === 1) {
|
||||
leaf_dir = sortDir(leaf_dir);
|
||||
}
|
||||
const tile_entry = queryTile(new DataView(leaf_dir), z, x, y);
|
||||
if (tile_entry) {
|
||||
const resp = await source.getBytes(
|
||||
tile_entry.offset,
|
||||
tile_entry.length,
|
||||
signal
|
||||
);
|
||||
let tile_data = resp.data;
|
||||
|
||||
const 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 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;
|
||||
return undefined;
|
||||
}
|
||||
|
||||
export default {
|
||||
getHeader: getHeader,
|
||||
getZxy: getZxy,
|
||||
getHeader: getHeader,
|
||||
getZxy: getZxy,
|
||||
};
|
||||
|
||||
Reference in New Issue
Block a user