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@hazae41/kcp

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Zero-copy KCP protocol for the web

github.com/hazae41/kcp

hazae41/kcp

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1
{"version":3,"file":"segment.cjs","sources":["../../../../src/mods/kcp/segment.ts"],"sourcesContent":["import { Empty, Opaque, Writable } from \"@hazae41/binary\";\nimport { Cursor } from \"@hazae41/cursor\";\n\nexport interface KcpSegmentParams<Fragment extends Writable> {\n readonly conversation: number,\n readonly command: number,\n readonly count?: number,\n readonly window?: number,\n readonly timestamp?: number,\n readonly serial: number,\n readonly unackSerial: number,\n readonly fragment: Fragment\n}\n\nexport class KcpSegment<Fragment extends Writable> {\n\n static readonly commands = {\n push: 81,\n ack: 82,\n wask: 83,\n wins: 84\n } as const\n\n private constructor(\n /**\n * conv\n */\n readonly conversation: number,\n /**\n * cmd\n */\n readonly command: number,\n /**\n * frg\n */\n readonly count = 0,\n /**\n * wnd\n */\n readonly window = 65535,\n /**\n * ts\n */\n readonly timestamp = Math.ceil(Date.now() / 1000),\n /**\n * sn\n */\n readonly serial: number,\n /**\n * una\n */\n readonly unackSerial: number,\n /**\n * data\n */\n readonly fragment: Fragment,\n /**\n * data size\n */\n readonly fragmentSize: number\n ) { }\n\n static empty(params: KcpSegmentParams<Empty>) {\n const { conversation, command, count, window, timestamp, serial, unackSerial, fragment } = params\n return new KcpSegment<Empty>(conversation, command, count, window, timestamp, serial, unackSerial, fragment, 0)\n }\n\n static newOrThrow<Fragment extends Writable>(params: KcpSegmentParams<Fragment>) {\n const { conversation, command, count, window, timestamp, serial, unackSerial, fragment } = params\n return new KcpSegment<Fragment>(conversation, command, count, window, timestamp, serial, unackSerial, fragment, fragment.sizeOrThrow())\n }\n\n sizeOrThrow() {\n return 0\n + 4\n + 1\n + 1\n + 2\n + 4\n + 4\n + 4\n + 4\n + this.fragmentSize\n }\n\n writeOrThrow(cursor: Cursor) {\n cursor.writeUint32OrThrow(this.conversation, true)\n cursor.writeUint8OrThrow(this.command)\n cursor.writeUint8OrThrow(this.count)\n cursor.writeUint16OrThrow(this.window, true)\n cursor.writeUint32OrThrow(this.timestamp, true)\n cursor.writeUint32OrThrow(this.serial, true)\n cursor.writeUint32OrThrow(this.unackSerial, true)\n cursor.writeUint32OrThrow(this.fragmentSize, true)\n\n this.fragment.writeOrThrow(cursor)\n }\n\n static readOrThrow(cursor: Cursor) {\n const conversation = cursor.readUint32OrThrow(true)\n const command = cursor.readUint8OrThrow()\n const count = cursor.readUint8OrThrow()\n const window = cursor.readUint16OrThrow(true)\n const timestamp = cursor.readUint32OrThrow(true)\n const serial = cursor.readUint32OrThrow(true)\n const unackSerial = cursor.readUint32OrThrow(true)\n const length = cursor.readUint32OrThrow(true)\n const bytes = cursor.readAndCopyOrThrow(length)\n const fragment = new Opaque(bytes)\n\n return KcpSegment.newOrThrow({ conversation, command, count, window, timestamp, serial, unackSerial, fragment })\n 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