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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { sendAsyncMinimal, sendSyncMinimal } from "./dispatch_minimal.ts";
// TODO(bartlomieju): remove this import and maybe lazy-initialize
// OPS_CACHE that belongs only to this module
import { OPS_CACHE } from "../runtime.ts";
// This is done because read/write are extremely performance sensitive.
let OP_READ = -1;
let OP_WRITE = -1;
export function readSync(rid: number, buffer: Uint8Array): number | null {
if (buffer.length == 0) {
return 0;
}
if (OP_READ < 0) {
OP_READ = OPS_CACHE["op_read"];
}
const nread = sendSyncMinimal(OP_READ, rid, buffer);
if (nread < 0) {
throw new Error("read error");
} else if (nread == 0) {
return null;
} else {
return nread;
}
}
export async function read(
rid: number,
buffer: Uint8Array
): Promise<number | null> {
if (buffer.length == 0) {
return 0;
}
if (OP_READ < 0) {
OP_READ = OPS_CACHE["op_read"];
}
const nread = await sendAsyncMinimal(OP_READ, rid, buffer);
if (nread < 0) {
throw new Error("read error");
} else if (nread == 0) {
return null;
} else {
return nread;
}
}
export function writeSync(rid: number, data: Uint8Array): number {
if (OP_WRITE < 0) {
OP_WRITE = OPS_CACHE["op_write"];
}
const result = sendSyncMinimal(OP_WRITE, rid, data);
if (result < 0) {
throw new Error("write error");
} else {
return result;
}
}
export async function write(rid: number, data: Uint8Array): Promise<number> {
if (OP_WRITE < 0) {
OP_WRITE = OPS_CACHE["op_write"];
}
const result = await sendAsyncMinimal(OP_WRITE, rid, data);
if (result < 0) {
throw new Error("write error");
} else {
return result;
}
}
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