mirror of
https://github.com/motajs/template.git
synced 2026-09-30 15:30:16 +08:00
unanmed
965e002476
- Encode bigint bytes by bit-shift mask instead of the broken accumulator - Decode the bigint length prefix and payload bytes unsigned - Encode negative bigint as dedicated type 8 with magnitude payload - Un-skip the multi-byte and heterogeneous bigint cases, add focused cases
826 lines
27 KiB
TypeScript
826 lines
27 KiB
TypeScript
import { logger } from '@motajs/common';
|
||
import {
|
||
IReplayArray,
|
||
IReplayArrayConfig,
|
||
IReplayReadStream,
|
||
IReplayStepHandler,
|
||
ReplayCommandWidth,
|
||
ReplayParamValue
|
||
} from './types';
|
||
|
||
interface INormalizedParam {
|
||
/**
|
||
* 参数类型：
|
||
*
|
||
* - 0: boolean
|
||
* - 1: int8
|
||
* - 2: int16
|
||
* - 3: int32
|
||
* - 4: 非负 int64，载荷为幅值
|
||
* - 5: 负 int64，载荷为幅值
|
||
* - 6: float
|
||
* - 7: 非负 bigint，载荷为幅值
|
||
* - 8: 负 bigint，载荷为幅值
|
||
* - 9: string，带 int32 长度前缀
|
||
* - 10 ~ 255: n - 9 长度的字符串
|
||
*/
|
||
readonly paramType: number;
|
||
|
||
/** 参数值 */
|
||
readonly paramValue: number | Uint8Array;
|
||
/** 此参数占据的字节长度，包含类型 token */
|
||
readonly byteLength: number;
|
||
}
|
||
|
||
interface IDecodedParam {
|
||
/** 参数值 */
|
||
readonly paramValue: ReplayParamValue;
|
||
/** 参数占据的字节数，包含类型 token */
|
||
readonly byteLength: number;
|
||
}
|
||
|
||
interface IDecodedCommand {
|
||
/** 指令标识 */
|
||
readonly command: number;
|
||
/** 指令的参数数量 */
|
||
readonly paramCount: number;
|
||
}
|
||
|
||
export class ReplayArray implements IReplayArray {
|
||
length: number = 0;
|
||
commandWidth: ReplayCommandWidth = ReplayCommandWidth.Uint8;
|
||
|
||
/** 文本编码器 */
|
||
private readonly textEncoder: TextEncoder;
|
||
/** 文本解码器 */
|
||
private readonly textDecoder: TextDecoder;
|
||
|
||
/** 指令数组缓冲区 */
|
||
private commandBuffer: ArrayBuffer;
|
||
/** 参数数组缓冲区 */
|
||
private paramBuffer: ArrayBuffer;
|
||
/** 参数起始索引缓冲区 */
|
||
private indexBuffer: ArrayBuffer;
|
||
/** 当前参数缓冲区已经使用了多少字节 */
|
||
private paramUsed: number;
|
||
|
||
/** 指令数组的 DataView */
|
||
private commandView: DataView;
|
||
/** 参数数组的 DataView */
|
||
private paramView: DataView;
|
||
/** 指令数组的 TypedArray */
|
||
private commandArray: Uint8Array;
|
||
/** 参数数组的 TypedArray */
|
||
private paramArray: Uint8Array;
|
||
/** 参数起始索引 TypedArray */
|
||
private indexArray: Uint32Array;
|
||
|
||
/** 指令数组扩容乘数 */
|
||
private readonly commandExpand: number;
|
||
/** 参数数组扩容乘数 */
|
||
private readonly paramExpand: number;
|
||
/** 指令数组最大长度 */
|
||
private readonly commandMax: number;
|
||
/** 参数数组最大长度 */
|
||
private readonly paramMax: number;
|
||
|
||
/** 所有可用的读取流 */
|
||
private readonly readStreams: Set<IReplayReadStream>;
|
||
|
||
/** 当前是否处于禁用状态 */
|
||
private disabled: number = 0;
|
||
|
||
constructor(config: Readonly<IReplayArrayConfig>) {
|
||
this.textEncoder = new TextEncoder();
|
||
this.textDecoder = new TextDecoder();
|
||
this.readStreams = new Set();
|
||
this.paramUsed = 0;
|
||
this.commandWidth = config.commandWidth;
|
||
this.commandMax = config.commandMaxLength;
|
||
this.paramMax = config.paramMaxLength;
|
||
|
||
if (config.commandExpandMultiplier < 1) {
|
||
const str = config.commandExpandMultiplier.toString();
|
||
logger.warn(149, 'command', str);
|
||
this.commandExpand = 2;
|
||
} else {
|
||
this.commandExpand = config.commandExpandMultiplier;
|
||
}
|
||
|
||
if (config.paramExpandMultiplier < 1) {
|
||
const str = config.paramExpandMultiplier.toString();
|
||
logger.warn(149, 'param', str);
|
||
this.paramExpand = 2;
|
||
} else {
|
||
this.paramExpand = config.paramExpandMultiplier;
|
||
}
|
||
|
||
const commandSize = this.getCommandSize();
|
||
this.commandBuffer = new ArrayBuffer(
|
||
config.initCommandLength * commandSize
|
||
);
|
||
this.paramBuffer = new ArrayBuffer(config.initParamLength);
|
||
this.indexBuffer = new ArrayBuffer(config.initCommandLength * 4);
|
||
|
||
this.commandView = new DataView(this.commandBuffer);
|
||
this.paramView = new DataView(this.paramBuffer);
|
||
this.commandArray = new Uint8Array(this.commandBuffer);
|
||
this.paramArray = new Uint8Array(this.paramBuffer);
|
||
this.indexArray = new Uint32Array(this.indexBuffer);
|
||
}
|
||
|
||
/**
|
||
* 获取指令位宽
|
||
*/
|
||
private getCommandSize() {
|
||
if (this.commandWidth === ReplayCommandWidth.Uint8) {
|
||
return 2;
|
||
} else {
|
||
return 3;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 检查两个数组缓冲区的容量，不足则扩容
|
||
* @param paramLength 将要添加至参数数组的内容的字节数
|
||
*/
|
||
private checkBufferExpand(paramLength: number) {
|
||
const commandSize = this.getCommandSize();
|
||
const commandLength = Math.ceil(
|
||
this.commandBuffer.byteLength / commandSize
|
||
);
|
||
|
||
let expanded = false;
|
||
|
||
if (commandLength - this.length < 10) {
|
||
if (commandLength >= this.commandMax) {
|
||
logger.warn(150, 'command', this.commandMax.toString());
|
||
} else {
|
||
const nextSize = Math.min(
|
||
Math.ceil(commandLength * this.commandExpand),
|
||
this.commandMax
|
||
);
|
||
const origin = this.commandArray;
|
||
this.commandBuffer = new ArrayBuffer(nextSize * commandSize);
|
||
this.commandView = new DataView(this.commandBuffer);
|
||
this.commandArray = new Uint8Array(this.commandBuffer);
|
||
this.commandArray.set(origin);
|
||
|
||
const originIndex = this.indexArray;
|
||
this.indexBuffer = new ArrayBuffer(nextSize * 4);
|
||
this.indexArray = new Uint32Array(this.indexBuffer);
|
||
this.indexArray.set(originIndex);
|
||
|
||
expanded = true;
|
||
}
|
||
}
|
||
|
||
if (this.paramBuffer.byteLength - this.paramUsed < paramLength + 10) {
|
||
if (this.paramBuffer.byteLength >= this.paramMax) {
|
||
logger.warn(150, 'param', this.paramMax.toString());
|
||
} else {
|
||
const nextSize = Math.min(
|
||
Math.ceil(this.paramBuffer.byteLength * this.paramExpand),
|
||
this.paramMax
|
||
);
|
||
const origin = this.paramArray;
|
||
this.paramBuffer = new ArrayBuffer(nextSize);
|
||
this.paramView = new DataView(this.paramBuffer);
|
||
this.paramArray = new Uint8Array(this.paramBuffer);
|
||
this.paramArray.set(origin);
|
||
|
||
expanded = true;
|
||
}
|
||
}
|
||
|
||
if (expanded) {
|
||
// 重新检查一遍，防止拓展之后还是不够用
|
||
this.checkBufferExpand(paramLength);
|
||
}
|
||
}
|
||
|
||
//#region 写入与编码
|
||
|
||
/**
|
||
* 将所有的读取流标记为过期并删除
|
||
*/
|
||
private expireStreams() {
|
||
this.readStreams.forEach(v => {
|
||
v.expired = true;
|
||
});
|
||
this.readStreams.clear();
|
||
}
|
||
|
||
/**
|
||
* 将数值标准化为数字或 Uint8Array
|
||
* @param param 参数值
|
||
*/
|
||
private normalizeParam(param: ReplayParamValue): INormalizedParam {
|
||
if (typeof param === 'boolean') {
|
||
// 0 - boolean
|
||
return {
|
||
paramType: 0,
|
||
paramValue: param ? 1 : 0,
|
||
byteLength: 2
|
||
};
|
||
} else if (typeof param === 'number') {
|
||
let type = 1;
|
||
let byte = 2;
|
||
if (Number.isInteger(param)) {
|
||
if (param < 128 && param >= -128) {
|
||
// 1 - int8
|
||
type = 1;
|
||
byte = 2;
|
||
} else if (param < 32768 && param >= -32768) {
|
||
// 2 - int16
|
||
type = 2;
|
||
byte = 3;
|
||
} else if (param < 2147483648 && param >= -2147483648) {
|
||
// 3 - int32
|
||
type = 3;
|
||
byte = 5;
|
||
} else if (param >= 2147483648) {
|
||
// 4 - 非负 int64
|
||
type = 4;
|
||
byte = 9;
|
||
} else {
|
||
// 5 - 负 int64，载荷为幅值
|
||
type = 5;
|
||
byte = 9;
|
||
}
|
||
} else {
|
||
// 6 - float
|
||
type = 6;
|
||
byte = 9;
|
||
}
|
||
return {
|
||
paramType: type,
|
||
paramValue: param,
|
||
byteLength: byte
|
||
};
|
||
} else if (typeof param === 'bigint') {
|
||
// 7 - 非负 bigint / 8 - 负 bigint，均以幅值按字节写入
|
||
const wall = 2n ** 2047n;
|
||
if (param > wall - 1n || param < -wall) {
|
||
logger.warn(152);
|
||
}
|
||
const magnitude = param < 0n ? -param : param;
|
||
const bit = magnitude.toString(2);
|
||
const length = Math.ceil(bit.length / 8);
|
||
const arr = new Uint8Array(length);
|
||
for (let i = 0; i < length; i++) {
|
||
arr[i] = Number((magnitude >> (8n * BigInt(i))) & 0xffn);
|
||
}
|
||
return {
|
||
paramType: param < 0n ? 8 : 7,
|
||
paramValue: arr,
|
||
byteLength: arr.length + 2
|
||
};
|
||
} else if (typeof param === 'string') {
|
||
const arr = this.textEncoder.encode(param);
|
||
if (arr.length > 0 && arr.length <= 246) {
|
||
// 10 ~ 255 - string
|
||
return {
|
||
paramType: arr.length + 9,
|
||
paramValue: arr,
|
||
byteLength: arr.length + 1
|
||
};
|
||
} else {
|
||
// 9 - string
|
||
return {
|
||
paramType: 9,
|
||
paramValue: arr,
|
||
byteLength: arr.length + 5
|
||
};
|
||
}
|
||
}
|
||
logger.warn(148, typeof param, String(param));
|
||
return {
|
||
paramType: 0,
|
||
paramValue: 0,
|
||
byteLength: 0
|
||
};
|
||
}
|
||
|
||
/**
|
||
* 将一系列参数值标准化为数字或 Uint8Array
|
||
* @param params 参数值列表
|
||
*/
|
||
private normalizeParamList(params: ReplayParamValue[]): INormalizedParam[] {
|
||
let arr = params;
|
||
if (params.length > 255) {
|
||
logger.warn(153, params.length.toString());
|
||
arr = params.slice(0, 255);
|
||
}
|
||
return arr.map(v => this.normalizeParam(v));
|
||
}
|
||
|
||
/**
|
||
* 计算参数所需的字节数
|
||
* @param params 标准化后的参数值
|
||
*/
|
||
private calculateParamsLength(params: INormalizedParam[]): number {
|
||
return params.reduce((prev, curr) => prev + curr.byteLength, 0);
|
||
}
|
||
|
||
/**
|
||
* 将指令实际写入缓冲区
|
||
* @param startIndex 指令的起始索引
|
||
* @param paramCount 指令对应的参数数量
|
||
* @param command 指令的标识数字
|
||
*/
|
||
private setCommandArray(
|
||
startIndex: number,
|
||
paramCount: number,
|
||
command: number
|
||
) {
|
||
this.commandView.setUint8(startIndex, paramCount);
|
||
if (this.commandWidth === ReplayCommandWidth.Uint8) {
|
||
this.commandView.setUint8(startIndex + 1, command);
|
||
} else {
|
||
this.commandView.setUint16(startIndex + 1, command);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 将参数列表实际写入缓冲区
|
||
* @param startIndex 起始索引
|
||
* @param params 参数列表
|
||
*/
|
||
private setParamArray(startIndex: number, params: INormalizedParam[]) {
|
||
let index = startIndex;
|
||
params.forEach(param => {
|
||
this.paramView.setInt8(index, param.paramType);
|
||
|
||
const num = param.paramValue as number;
|
||
const arr = param.paramValue as Uint8Array;
|
||
|
||
if (param.paramType === 0) {
|
||
// 0 - boolean
|
||
this.paramView.setInt8(index + 1, num);
|
||
} else if (param.paramType === 1) {
|
||
// 1 - int8
|
||
this.paramView.setInt8(index + 1, num);
|
||
} else if (param.paramType === 2) {
|
||
// 2 - int16
|
||
this.paramView.setInt16(index + 1, num);
|
||
} else if (param.paramType === 3) {
|
||
// 3 - int32
|
||
this.paramView.setInt32(index + 1, num);
|
||
} else if (param.paramType === 4 || param.paramType === 5) {
|
||
// 4 - 非负 int64 / 5 - 负 int64，均以幅值拆分高低 32 位
|
||
const magnitude = num < 0 ? -num : num;
|
||
const high = Math.floor(magnitude / 2147483648);
|
||
const low = magnitude - high * 2147483648;
|
||
this.paramView.setInt32(index + 1, low);
|
||
this.paramView.setInt32(index + 5, high);
|
||
} else if (param.paramType === 6) {
|
||
// 6 - float
|
||
this.paramView.setFloat64(index + 1, num);
|
||
} else if (param.paramType === 7 || param.paramType === 8) {
|
||
// 7 - 非负 bigint / 8 - 负 bigint，写入幅值字节
|
||
this.paramArray[index + 1] = arr.length;
|
||
this.paramArray.set(arr, index + 2);
|
||
} else if (param.paramType === 9) {
|
||
// 9 - string
|
||
this.paramView.setInt32(index + 1, arr.length);
|
||
this.paramArray.set(arr, index + 5);
|
||
} else {
|
||
// 10 ~ 255 - string
|
||
this.paramArray.set(arr, index + 1);
|
||
}
|
||
index += param.byteLength;
|
||
});
|
||
}
|
||
|
||
add(command: number, params: ReplayParamValue[]): void {
|
||
if (this.disabled > 0) return;
|
||
const normalized = this.normalizeParamList(params);
|
||
const length = this.calculateParamsLength(normalized);
|
||
this.checkBufferExpand(length);
|
||
|
||
// 追加指令
|
||
const commandSize = this.getCommandSize();
|
||
const commandStart = commandSize * this.length;
|
||
this.setCommandArray(commandStart, params.length, command);
|
||
|
||
// 追加参数
|
||
this.setParamArray(this.paramUsed, normalized);
|
||
this.indexArray[this.length] = this.paramUsed;
|
||
this.paramUsed += length;
|
||
this.length++;
|
||
|
||
this.expireStreams();
|
||
}
|
||
|
||
insert(index: number, command: number, params: ReplayParamValue[]): void {
|
||
if (this.disabled > 0) return;
|
||
const normalized = this.normalizeParamList(params);
|
||
const length = this.calculateParamsLength(normalized);
|
||
this.checkBufferExpand(length);
|
||
|
||
const commandSize = this.getCommandSize();
|
||
|
||
// 先进行位移
|
||
const commandStart = index * commandSize;
|
||
const paramStart = this.indexArray[index];
|
||
this.commandArray.copyWithin(commandStart + commandSize, commandStart);
|
||
this.paramArray.copyWithin(paramStart, paramStart + length);
|
||
this.indexArray.copyWithin(index, index + 1);
|
||
|
||
// 然后进行赋值操作，索引数组因为这一个指令的起始索引其实没变，所以不需要赋值
|
||
this.setCommandArray(commandStart, params.length, command);
|
||
this.setParamArray(paramStart, normalized);
|
||
|
||
this.length++;
|
||
this.paramUsed += length;
|
||
|
||
// 最后把后面的内容的索引数组增加 length 即可
|
||
for (let i = index + 1; i < this.length; i++) {
|
||
this.indexArray[i] += length;
|
||
}
|
||
|
||
this.expireStreams();
|
||
}
|
||
|
||
delete(index: number): void {
|
||
if (this.disabled > 0) return;
|
||
const commandSize = this.getCommandSize();
|
||
const commandStart = index * commandSize;
|
||
const paramStart = this.indexArray[index];
|
||
const nextParam = this.indexArray[index + 1];
|
||
const paramLength = nextParam - paramStart;
|
||
|
||
// 直接进行位移
|
||
this.commandArray.copyWithin(commandStart, commandStart + commandSize);
|
||
this.paramArray.copyWithin(paramStart, nextParam);
|
||
this.indexArray.copyWithin(index, index + 1);
|
||
|
||
this.length--;
|
||
this.paramUsed -= paramLength;
|
||
|
||
// 然后把后续值赋零
|
||
const commandLast = this.length * commandSize;
|
||
const paramLast = this.paramUsed;
|
||
this.commandArray[commandLast] = 0;
|
||
this.commandArray[commandLast + 1] = 0;
|
||
this.commandArray[commandLast + 2] = 0;
|
||
for (let i = 0; i < paramLength; i++) {
|
||
this.paramArray[paramLast + i] = 0;
|
||
}
|
||
|
||
// 最后把后面的索引减少 paramLength
|
||
for (let i = paramStart; i < this.length; i++) {
|
||
this.indexArray[i] -= paramLength;
|
||
}
|
||
|
||
this.expireStreams();
|
||
}
|
||
|
||
set(index: number, command: number, params: ReplayParamValue[]): void {
|
||
if (this.disabled > 0) return;
|
||
const normalized = this.normalizeParamList(params);
|
||
const length = this.calculateParamsLength(normalized);
|
||
const paramStart = this.indexArray[index];
|
||
const nextParam = this.indexArray[index + 1];
|
||
const paramLength = nextParam - paramStart;
|
||
const deltaLength = length - paramLength;
|
||
if (deltaLength > 0) {
|
||
this.checkBufferExpand(deltaLength);
|
||
}
|
||
|
||
// 先写入指令
|
||
const commandSize = this.getCommandSize();
|
||
const commandStart = index * commandSize;
|
||
this.setCommandArray(commandStart, params.length, command);
|
||
|
||
// 然后根据差值位移参数数组，如果参数长度减少还需要将最后几项置零
|
||
this.paramArray.copyWithin(nextParam + deltaLength, nextParam);
|
||
this.paramUsed += deltaLength;
|
||
if (deltaLength < 0) {
|
||
const zeros = -deltaLength;
|
||
const paramLast = this.paramUsed;
|
||
for (let i = 0; i < zeros; i++) {
|
||
this.paramArray[paramLast + i] = 0;
|
||
}
|
||
}
|
||
|
||
// 然后设置参数数组
|
||
this.setParamArray(paramStart, normalized);
|
||
|
||
// 最后调整索引数组
|
||
for (let i = paramStart + 1; i < this.length; i++) {
|
||
this.indexArray[i] += deltaLength;
|
||
}
|
||
|
||
this.expireStreams();
|
||
}
|
||
|
||
setCommandWidth(width: ReplayCommandWidth): void {
|
||
this.disable();
|
||
const oldWidth = this.commandWidth;
|
||
const oldSize = this.getCommandSize();
|
||
this.commandWidth = width;
|
||
const newSize = this.getCommandSize();
|
||
const commandLength = this.commandBuffer.byteLength / oldSize;
|
||
const length = Math.floor(commandLength * newSize);
|
||
const newBuffer = new ArrayBuffer(length);
|
||
const newView = new DataView(newBuffer);
|
||
|
||
for (let i = 0; i < this.length; i++) {
|
||
const oldStart = i * oldSize;
|
||
const newStart = i * newSize;
|
||
|
||
// 先读取旧指令
|
||
const count = this.commandView.getUint8(oldStart);
|
||
let oldCommand = 0;
|
||
if (oldWidth === ReplayCommandWidth.Uint8) {
|
||
oldCommand = this.commandView.getUint8(oldStart + 1);
|
||
} else {
|
||
oldCommand = this.commandView.getUint16(oldStart + 1);
|
||
}
|
||
|
||
// 再写入新的 DataView
|
||
newView.setUint8(newStart, count);
|
||
if (width === ReplayCommandWidth.Uint8) {
|
||
if (oldCommand > 255) {
|
||
logger.warn(154, oldCommand.toString());
|
||
}
|
||
newView.setUint8(newStart + 1, oldCommand);
|
||
} else {
|
||
newView.setUint16(newStart + 1, oldCommand);
|
||
}
|
||
}
|
||
|
||
this.commandBuffer = newBuffer;
|
||
this.commandArray = new Uint8Array(newBuffer);
|
||
this.commandView = newView;
|
||
|
||
this.expireStreams();
|
||
this.revert();
|
||
}
|
||
|
||
//#endregion
|
||
|
||
//#region 读取与解码
|
||
|
||
/**
|
||
* 解码单个录像指令
|
||
* @param startIndex 解码起始索引
|
||
*/
|
||
private decodeCommand(startIndex: number): IDecodedCommand {
|
||
const count = this.commandView.getUint8(startIndex);
|
||
let command = 0;
|
||
if (this.commandWidth === ReplayCommandWidth.Uint8) {
|
||
command = this.commandView.getUint8(startIndex + 1);
|
||
} else {
|
||
command = this.commandView.getUint16(startIndex + 1);
|
||
}
|
||
|
||
return {
|
||
command,
|
||
paramCount: count
|
||
};
|
||
}
|
||
|
||
/**
|
||
* 解码单个录像参数
|
||
* @param startIndex 解码起始索引
|
||
*/
|
||
private decodeParam(startIndex: number): IDecodedParam {
|
||
const type = this.paramArray[startIndex];
|
||
|
||
let value: ReplayParamValue = 0;
|
||
let byte = 0;
|
||
|
||
if (type === 0) {
|
||
// 0 - boolean
|
||
const next = this.paramArray[startIndex + 1];
|
||
byte = 2;
|
||
if (next === 1) {
|
||
value = true;
|
||
} else if (next === 0) {
|
||
value = false;
|
||
} else {
|
||
logger.warn(151, next.toString());
|
||
value = false;
|
||
}
|
||
} else if (type === 1) {
|
||
// 1 - int8
|
||
byte = 2;
|
||
value = this.paramView.getInt8(startIndex + 1);
|
||
} else if (type === 2) {
|
||
// 2 - int16
|
||
byte = 3;
|
||
value = this.paramView.getInt16(startIndex + 1);
|
||
} else if (type === 3) {
|
||
// 3 - int32
|
||
byte = 5;
|
||
value = this.paramView.getInt32(startIndex + 1);
|
||
} else if (type === 4) {
|
||
// 4 - 非负 int64
|
||
const low = this.paramView.getInt32(startIndex + 1);
|
||
const high = this.paramView.getInt32(startIndex + 5);
|
||
byte = 9;
|
||
value = low + high * 2147483648;
|
||
} else if (type === 5) {
|
||
// 5 - 负 int64，读回幅值后取负
|
||
const low = this.paramView.getInt32(startIndex + 1);
|
||
const high = this.paramView.getInt32(startIndex + 5);
|
||
byte = 9;
|
||
value = -(low + high * 2147483648);
|
||
} else if (type === 6) {
|
||
// 6 - float
|
||
byte = 9;
|
||
value = this.paramView.getFloat64(startIndex + 1);
|
||
} else if (type === 7 || type === 8) {
|
||
// 7 - 非负 bigint / 8 - 负 bigint，读回幅值后按类型码还原符号
|
||
const length = this.paramView.getUint8(startIndex + 1);
|
||
let base = 0n;
|
||
for (let i = 0; i < length; i++) {
|
||
const num = this.paramView.getUint8(startIndex + 2 + i);
|
||
base += BigInt(num) << (8n * BigInt(i));
|
||
}
|
||
byte = length + 2;
|
||
value = type === 8 ? -base : base;
|
||
} else if (type === 9) {
|
||
// 9 - string
|
||
const length = this.paramView.getInt32(startIndex + 1);
|
||
const endIndex = startIndex + 5 + length;
|
||
const arr = this.paramArray.slice(startIndex + 5, endIndex);
|
||
byte = length + 5;
|
||
value = this.textDecoder.decode(arr);
|
||
} else {
|
||
// 10 ~ 255 - string
|
||
const length = type - 9;
|
||
const endIndex = startIndex + 1 + length;
|
||
const arr = this.paramArray.slice(startIndex + 1, endIndex);
|
||
byte = length + 1;
|
||
value = this.textDecoder.decode(arr);
|
||
}
|
||
|
||
return {
|
||
paramValue: value,
|
||
byteLength: byte
|
||
};
|
||
}
|
||
|
||
/**
|
||
* 解码指定数量的录像参数
|
||
* @param startIndex 解码起始索引
|
||
* @param count 解码参数数量
|
||
*/
|
||
private decodeParamList(
|
||
startIndex: number,
|
||
count: number
|
||
): IDecodedParam[] {
|
||
const arr: IDecodedParam[] = [];
|
||
|
||
let index = startIndex;
|
||
for (let i = 0; i < count; i++) {
|
||
const decoded = this.decodeParam(index);
|
||
index += decoded.byteLength;
|
||
arr.push(decoded);
|
||
}
|
||
|
||
return arr;
|
||
}
|
||
|
||
/**
|
||
* 创建录像步信息对象
|
||
* @param command 指令标识
|
||
* @param params 解码后的参数列表
|
||
* @param index 录像索引
|
||
*/
|
||
private createReplayStepHandler(
|
||
command: number,
|
||
params: IDecodedParam[],
|
||
index: number
|
||
): IReplayStepHandler {
|
||
return {
|
||
command,
|
||
params: params.map(v => v.paramValue),
|
||
index
|
||
};
|
||
}
|
||
|
||
get(index: number): IReplayStepHandler {
|
||
const commandSize = this.getCommandSize();
|
||
const commandStart = index * commandSize;
|
||
const paramStart = this.indexArray[index];
|
||
|
||
const command = this.decodeCommand(commandStart);
|
||
const params = this.decodeParamList(paramStart, command.paramCount);
|
||
|
||
return this.createReplayStepHandler(command.command, params, index);
|
||
}
|
||
|
||
createReadStream(startIndex: number = 0): Readonly<IReplayReadStream> {
|
||
const commandSize = this.getCommandSize();
|
||
let currCommand = startIndex * commandSize;
|
||
let currParam = this.indexArray[startIndex];
|
||
|
||
const stream: IReplayReadStream = {
|
||
index: startIndex,
|
||
length: this.length,
|
||
expired: false,
|
||
|
||
read: () => {
|
||
if (stream.expired) {
|
||
logger.warn(155);
|
||
}
|
||
if (stream.index >= this.length) return null;
|
||
const { command, paramCount } = this.decodeCommand(currCommand);
|
||
const params = this.decodeParamList(currParam, paramCount);
|
||
stream.index++;
|
||
currCommand += commandSize;
|
||
currParam += params.reduce(
|
||
(prev, curr) => prev + curr.byteLength,
|
||
0
|
||
);
|
||
const index = stream.index;
|
||
return this.createReplayStepHandler(command, params, index);
|
||
},
|
||
|
||
destroy: () => {
|
||
this.readStreams.delete(stream);
|
||
}
|
||
};
|
||
|
||
this.readStreams.add(stream);
|
||
|
||
return stream;
|
||
}
|
||
|
||
//#endregion
|
||
|
||
//#region 重建方法
|
||
|
||
rebuildIndexArray(): void {
|
||
const commandSize = this.getCommandSize();
|
||
let currCommand = 0;
|
||
let currParam = 0;
|
||
|
||
// 需要对每个参数进行解码，然后 cumsum
|
||
for (let i = 0; i < this.length; i++) {
|
||
const { paramCount } = this.decodeCommand(currCommand);
|
||
const params = this.decodeParamList(currParam, paramCount);
|
||
this.indexArray[i] = currParam;
|
||
currCommand += commandSize;
|
||
currParam += params.reduce(
|
||
(prev, curr) => prev + curr.byteLength,
|
||
0
|
||
);
|
||
}
|
||
|
||
this.paramUsed = currParam;
|
||
}
|
||
|
||
setReplayArray(
|
||
commandWidth: ReplayCommandWidth,
|
||
commandBuffer: ArrayBuffer,
|
||
paramBuffer: ArrayBuffer,
|
||
length: number
|
||
): void {
|
||
this.disabled = 0;
|
||
this.commandWidth = commandWidth;
|
||
this.commandBuffer = commandBuffer;
|
||
this.commandArray = new Uint8Array(commandBuffer);
|
||
this.commandView = new DataView(commandBuffer);
|
||
this.paramBuffer = paramBuffer;
|
||
this.paramArray = new Uint8Array(paramBuffer);
|
||
this.paramView = new DataView(paramBuffer);
|
||
|
||
const commandSize = this.getCommandSize();
|
||
const commandBufferLength = Math.ceil(
|
||
commandBuffer.byteLength / commandSize
|
||
);
|
||
this.indexBuffer = new ArrayBuffer(commandBufferLength * 4);
|
||
this.indexArray = new Uint32Array(this.indexBuffer);
|
||
|
||
this.length = length;
|
||
|
||
this.rebuildIndexArray();
|
||
}
|
||
|
||
//#endregion
|
||
|
||
getCommandArray(): ArrayBuffer {
|
||
return this.commandBuffer;
|
||
}
|
||
|
||
getParamArray(): ArrayBuffer {
|
||
return this.paramBuffer;
|
||
}
|
||
|
||
disable(): void {
|
||
this.disabled++;
|
||
}
|
||
|
||
revert(): void {
|
||
if (this.disabled > 0) {
|
||
this.disabled--;
|
||
}
|
||
}
|
||
}
|