ya-webadb/libraries/adb/src/commands/sync/request.ts

import { encodeUtf8, struct, u32 } from "@yume-chan/struct";

export const AdbSyncNumberRequest = struct(
    { id: u32, arg: u32 },
    { littleEndian: true },
);

export interface AdbSyncWritable {
    write(buffer: Uint8Array): Promise<void>;
}

export async function adbSyncWriteRequest(
    writable: AdbSyncWritable,
    id: number,
    value: number | string | Uint8Array,
): Promise<void> {
    if (typeof value === "number") {
        await writable.write(
            AdbSyncNumberRequest.serialize({ id, arg: value }),
        );
        return;
    }

    if (typeof value === "string") {
        value = encodeUtf8(value);
    }

    // `writable` is buffered, it copies inputs to an internal buffer,
    // so don't concatenate headers and data here, that will be an unnecessary copy.
    await writable.write(
        AdbSyncNumberRequest.serialize({ id, arg: value.length }),
    );
    await writable.write(value);
}