Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | 2x 2x 2x 2x 2x 25x 9x 9x 15x 15x 3x 3x 33x 33x 9x 9x 7x 7x 2x 15x 15x 14x 14x 1x 3x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 1x 64x 64x 64x 64x 53x 53x 11x 7x 7x 4x 4x 4x 4x 64x 1x 1x 1x 1x 1x 5x 5x 5x 5x 5x 5x 17x 5x | import {Writer} from '@jsonjoy.com/buffers/lib/Writer';
import {WsFrameOpcode} from './constants';
import {WsFrameEncodingError} from './errors';
import type {IWriter, IWriterGrowable} from '@jsonjoy.com/buffers';
const maskBuf = new Uint8Array(4);
const maskBufView = new DataView(maskBuf.buffer, maskBuf.byteOffset, maskBuf.byteLength);
export class WsFrameEncoder<W extends IWriter & IWriterGrowable = IWriter & IWriterGrowable> {
constructor(public readonly writer: W = new Writer() as any) {}
public encodePing(data: Uint8Array | null): Uint8Array {
this.writePing(data);
return this.writer.flush();
}
public encodePong(data: Uint8Array | null): Uint8Array {
this.writePong(data);
return this.writer.flush();
}
public encodeClose(reason: string, code = 0): Uint8Array {
this.writeClose(reason, code);
return this.writer.flush();
}
public encodeHdr(fin: 0 | 1, opcode: WsFrameOpcode, length: number, mask: number): Uint8Array {
this.writeHdr(fin, opcode, length, mask);
return this.writer.flush();
}
public encodeDataMsgHdrFast(length: number): Uint8Array {
this.writeDataMsgHdrFast(length);
return this.writer.flush();
}
public writePing(data: Uint8Array | null): void {
let length = 0;
if (data && (length = data.length)) {
this.writeHdr(1, WsFrameOpcode.PING, length, 0);
this.writer.buf(data, length);
} else {
this.writeHdr(1, WsFrameOpcode.PING, 0, 0);
}
}
public writePong(data: Uint8Array | null): void {
let length = 0;
if (data && (length = data.length)) {
this.writeHdr(1, WsFrameOpcode.PONG, length, 0);
this.writer.buf(data, length);
} else {
this.writeHdr(1, WsFrameOpcode.PONG, 0, 0);
}
}
public writeClose(reason: string, code = 0): void {
if (reason || code) {
const reasonLength = reason.length;
const length = 2 + reasonLength;
const writer = this.writer;
writer.ensureCapacity(
2 + // Frame header
2 + // Close code 2 bytes
reasonLength * 4, // Close reason, max 4 bytes per UTF-8 char
);
const lengthX = writer.x + 1;
this.writeHdr(1, WsFrameOpcode.CLOSE, length, 0);
writer.u16(code);
Eif (reasonLength) {
const utf8Length = writer.utf8(reason);
Iif (utf8Length !== reasonLength) {
if (utf8Length > 126 - 2) throw new WsFrameEncodingError();
writer.uint8[lengthX] = (writer.uint8[lengthX] & 0b10000000) | (utf8Length + 2);
}
}
} else {
this.writeHdr(1, WsFrameOpcode.CLOSE, 0, 0);
}
}
public writeHdr(fin: 0 | 1, opcode: WsFrameOpcode, length: number, mask: number): void {
const octet1 = (fin << 7) | opcode;
const maskBit = mask ? 0b10000000 : 0b00000000;
const writer = this.writer;
if (length < 126) {
const octet2 = maskBit | length;
writer.u16((octet1 << 8) | octet2);
} else if (length < 0x10000) {
const octet2 = maskBit | 126;
writer.u32(((octet1 << 8) | octet2) * 0x10000 + length);
} else {
const octet2 = maskBit | 127;
writer.u16((octet1 << 8) | octet2);
writer.u32(0);
writer.u32(length);
}
if (mask) writer.u32(mask);
}
public writeDataMsgHdrFast(length: number): void {
const writer = this.writer;
Iif (length < 126) {
writer.u16(0b10000010_00000000 + length);
return;
}
Eif (length < 0x10000) {
writer.u32(0b10000010_01111110_00000000_00000000 + length);
return;
}
writer.u16(0b10000010_01111111);
writer.u32(0);
writer.u32(length);
}
public writeBufXor(buf: Uint8Array, mask: number): void {
maskBufView.setUint32(0, mask, false);
const writer = this.writer;
const length = buf.length;
writer.ensureCapacity(length);
let x = writer.x;
const uint8 = writer.uint8;
for (let i = 0; i < length; i++) uint8[x++] = buf[i] ^ maskBuf[i & 3];
writer.x = x;
}
}
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