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v3 js: varint routines [#41]

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This commit is contained in:
Brandon Liu
2022-09-19 21:13:58 -07:00
parent 07eaf102a9
commit fbb0f4614c
2 changed files with 89 additions and 5 deletions
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36
js/index.test.ts
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@@ -11,7 +11,13 @@ import {
createDirectory,
} from "./index";
import { Entry as EntryV3, zxyToTileId, tileIdToZxy, findTile } from "./v3";
import {
Entry as EntryV3,
zxyToTileId,
tileIdToZxy,
findTile,
readVarint,
} from "./v3";
test("stub data", (assertion) => {
let dataview = createDirectory([
@@ -148,6 +154,22 @@ test("convert spec v1 directory to spec v2 directory", (assertion) => {
assertion.ok(entry!.offset === 3);
});
test("varint", (assertion) => {
let b: BufferPosition = {
buf: new Uint8Array([0, 1, 127, 0xe5, 0x8e, 0x26]),
pos: 0,
};
assertion.eq(readVarint(b), 0);
assertion.eq(readVarint(b), 1);
assertion.eq(readVarint(b), 127);
assertion.eq(readVarint(b), 624485);
b = {
buf: new Uint8Array([0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0f]),
pos: 0,
};
assertion.eq(readVarint(b), 9007199254740991);
});
test("zxy to tile id", (assertion) => {
assertion.eq(zxyToTileId(0, 0, 0), 0);
assertion.eq(zxyToTileId(1, 0, 0), 1);
@@ -185,7 +207,9 @@ test("tile search for first entry == id", (assertion) => {
});
test("tile search for first entry == id", (assertion) => {
let entries: EntryV3[] = [{ tileId: 100, offset: 1, length: 1, runLength: 1 }];
let entries: EntryV3[] = [
{ tileId: 100, offset: 1, length: 1, runLength: 1 },
];
let entry = findTile(entries, 100)!;
assertion.eq(entry.offset, 1);
assertion.eq(entry.length, 1);
@@ -193,7 +217,9 @@ test("tile search for first entry == id", (assertion) => {
});
test("tile search for first entry == id", (assertion) => {
let entries: EntryV3[] = [{ tileId: 100, offset: 1, length: 1, runLength: 2 }];
let entries: EntryV3[] = [
{ tileId: 100, offset: 1, length: 1, runLength: 2 },
];
let entry = findTile(entries, 101)!;
assertion.eq(entry.offset, 1);
assertion.eq(entry.length, 1);
@@ -217,7 +243,9 @@ test("tile search for first entry == id", (assertion) => {
});
test("leaf search", (assertion) => {
let entries: EntryV3[] = [{ tileId: 100, offset: 1, length: 1, runLength: 0 }];
let entries: EntryV3[] = [
{ tileId: 100, offset: 1, length: 1, runLength: 0 },
];
let entry = findTile(entries, 150);
assertion.eq(entry!.offset, 1);
assertion.eq(entry!.length, 1);