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