shardy/dist/Block.js

Framework for online games and applications on Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Block = exports.BlockType = exports.BLOCK_HEAD = void 0;
exports.BLOCK_HEAD = 4;
var BlockType;
(function (BlockType) {
    BlockType[BlockType["Handshake"] = 0] = "Handshake";
    BlockType[BlockType["HandshakeAcknowledgement"] = 1] = "HandshakeAcknowledgement";
    BlockType[BlockType["Heartbeat"] = 2] = "Heartbeat";
    BlockType[BlockType["Data"] = 3] = "Data";
    BlockType[BlockType["Kick"] = 4] = "Kick";
})(BlockType || (exports.BlockType = BlockType = {}));
class Block {
    static encode(type, body) {
        const data = Buffer.from(body);
        const length = body ? body.length : 0;
        const buffer = Buffer.alloc(exports.BLOCK_HEAD + length);
        let index = 0;
        buffer[index++] = type & 0xff;
        buffer[index++] = (length >> 16) & 0xff;
        buffer[index++] = (length >> 8) & 0xff;
        buffer[index++] = length & 0xff;
        data.copy(buffer, index, 0, length);
        return buffer;
    }
    static decode(data) {
        const bytes = Buffer.from(data);
        const type = bytes[0];
        let index = 1;
        const length = ((bytes[index++] << 16) | (bytes[index++] << 8) | bytes[index++]) >>> 0;
        const body = length ? Buffer.alloc(length) : Buffer.alloc(0);
        bytes.copy(body, 0, exports.BLOCK_HEAD, exports.BLOCK_HEAD + length);
        return { type, body };
    }
    static check(type) {
        return Object.values(BlockType).includes(type);
    }
}
exports.Block = Block;
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