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js client: show error when future spec version is read

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This commit is contained in:
Brandon Liu
2022-11-01 17:02:49 +08:00
parent 92f6670640
commit 302eeab47e
3 changed files with 19 additions and 2 deletions
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9
js/index.ts
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@@ -309,8 +309,15 @@ export class FetchSource implements Source {
export function bytesToHeader(bytes: ArrayBuffer, etag?: string): Header {
const v = new DataView(bytes);
const spec_version = v.getUint8(7);
if (spec_version > 3) {
throw Error(
`Archive is spec version ${spec_version} but this library supports up to spec version 3`
);
}
return {
specVersion: 3,
specVersion: spec_version,
rootDirectoryOffset: Number(v.getBigUint64(8, true)),
rootDirectoryLength: Number(v.getBigUint64(16, true)),
jsonMetadataOffset: Number(v.getBigUint64(24, true)),