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Add types for aniParse

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This commit is contained in:
Jordan Eldredge 2020-12-02 22:25:15 -08:00
parent 38360208f1
commit 2d6257712e
1 changed files with 19 additions and 8 deletions
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27
packages/webamp/js/aniParser.ts
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@ -1,12 +1,22 @@
import { RIFFFile } from "riff-file";
import { unpackArray } from "byte-data";
export function parseAni(arr) {
let riff = new RIFFFile();
type Chunk = {
format: string;
chunkId: string;
chunkData: {
start: number;
end: number;
};
subChunks: Chunk[];
};
export function parseAni(arr: Uint8Array) {
const riff = new RIFFFile();
riff.setSignature(arr);
const { signature } = riff;
const signature = riff.signature as Chunk;
if (signature.format !== "ACON") {
throw new Error(`Invalid format. Expected "ACON", got ${signature.format}`);
}
@ -44,7 +54,8 @@ export function parseAni(arr) {
}
const DWORD = { bits: 32, be: false, signed: false, fp: false };
function parseMetadata(chunkData) {
function parseMetadata(chunkData: Uint8Array) {
const words = unpackArray(chunkData, DWORD);
if (words.length !== 9) {
throw new Error(
@ -64,15 +75,15 @@ function parseMetadata(chunkData) {
};
}
function base64(u8) {
return btoa(String.fromCharCode.apply(null, u8));
function base64(u8: Uint8Array): string {
return window.btoa(String.fromCharCode.apply(null, u8));
}
function urlFromData(arr) {
function urlFromData(arr: Uint8Array): string {
const arrBase64 = base64(arr);
return `data:image/x-win-bitmap;base64,${arrBase64}`;
}
function getChunkData(arr, chunk) {
function getChunkData(arr: Uint8Array, chunk: Chunk): Uint8Array {
return arr.slice(chunk.chunkData.start, chunk.chunkData.end);
}