@oaklean/profiler-core
Version:
Part of the @oaklean suite. It provides all basic functions to work with the `.oak` file format. It allows parsing the `.oak` file format as well as tools for analyzing the measurement values. It also provides all necessary capabilities required for prec
281 lines • 27 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.BufferHelper = exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES = void 0;
const zlib_1 = __importDefault(require("zlib"));
// Types
const types_1 = require("../types");
exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES = {
[types_1.PrimitiveBufferTypes.UInt]: 4,
[types_1.PrimitiveBufferTypes.Double]: 8,
[types_1.PrimitiveBufferTypes.String2L]: 2 ** 16 - 1,
[types_1.PrimitiveBufferTypes.String4L]: 2 ** 32 - 1,
[types_1.PrimitiveBufferTypes.Boolean]: 1,
[types_1.PrimitiveBufferTypes.UInt8]: 1,
};
const VALUE_MAP_HEADER_SIZE = 2; // in bytes
class BufferHelper {
static numberMapToBuffer(typeMap, values, keyOffset) {
// first segmentSize * 8 - 1 bits are used to mark wether a value is present
// the (segmentSize * 8)th bit marks wether there comes a valueMap behind
const valueIsPresent_Buffer = Buffer.alloc(VALUE_MAP_HEADER_SIZE);
const keys = Array.from(Object.keys(typeMap));
const valueBuffers = [];
const valueLen = Math.min(VALUE_MAP_HEADER_SIZE * 8 - 1, keys.length - (keyOffset || 0));
for (let i = 0; i < valueLen; i++) {
const key = keys[i + (keyOffset || 0)];
const byteSize = typeMap[key];
if (values[key] !== undefined && values[key] !== 0) {
switch (byteSize) {
case types_1.PrimitiveBufferTypes.UInt:
valueBuffers.push(BufferHelper.UIntToBuffer(values[key], key));
break;
case types_1.PrimitiveBufferTypes.Double:
valueBuffers.push(BufferHelper.DoubleToBuffer(values[key]));
break;
default:
throw new Error('BufferHelper.valueMap: unexpected byte size');
}
BufferHelper.setBit(valueIsPresent_Buffer, i, 1);
}
}
if (keys.length - (keyOffset || 0) > VALUE_MAP_HEADER_SIZE * 8 - 1) {
const nextBuffer = BufferHelper.numberMapToBuffer(typeMap, values, (keyOffset || 0) + valueLen);
if (nextBuffer.subarray(0, VALUE_MAP_HEADER_SIZE).toString('hex') === '00'.repeat(VALUE_MAP_HEADER_SIZE)) {
return Buffer.concat([valueIsPresent_Buffer, ...valueBuffers]);
}
BufferHelper.setBit(valueIsPresent_Buffer, VALUE_MAP_HEADER_SIZE * 8 - 1, 1);
// still values to store
return Buffer.concat([valueIsPresent_Buffer, ...valueBuffers, nextBuffer]);
}
return Buffer.concat([valueIsPresent_Buffer, ...valueBuffers]);
}
static numberMapFromBuffer(typeMap, buffer) {
const { result: numberArray, remainingBuffer } = BufferHelper.numberArrayFromBuffer(buffer, typeMap);
const result = {};
const keys = Array.from(Object.keys(typeMap));
for (let i = 0; i < keys.length; i++) {
result[keys[i]] = numberArray[i] || 0;
}
return {
instance: result,
remainingBuffer
};
}
static numberArrayFromBuffer(buffer, typeMap, keyOffset) {
if (buffer.byteLength < 2) {
throw new Error('BufferHelper.valueMapFromBuffer: not enough bytes remaining');
}
const valueIsPresent_Buffer = buffer.subarray(0, 2);
let remainingBuffer = buffer.subarray(2);
const keys = Array.from(Object.keys(typeMap));
const data = [];
for (let i = 0; i < VALUE_MAP_HEADER_SIZE * 8 - 1; i++) {
const key = keys[i + (keyOffset || 0)];
if (BufferHelper.readBit(valueIsPresent_Buffer, i) === 1) {
switch (typeMap[key]) {
case types_1.PrimitiveBufferTypes.UInt:
{
const { instance, remainingBuffer: newRemainingBuffer } = BufferHelper.UIntFromBuffer(remainingBuffer);
remainingBuffer = newRemainingBuffer;
data.push(instance);
}
break;
case types_1.PrimitiveBufferTypes.Double:
{
const { instance, remainingBuffer: newRemainingBuffer } = BufferHelper.DoubleFromBuffer(remainingBuffer);
remainingBuffer = newRemainingBuffer;
data.push(instance);
}
break;
default:
throw new Error('SensorValues.toBuffer: unexpected primitive buffer type');
}
}
else {
data.push(0);
}
}
if (keys.length - (keyOffset || 0) > VALUE_MAP_HEADER_SIZE * 8 - 1 &&
BufferHelper.readBit(valueIsPresent_Buffer, VALUE_MAP_HEADER_SIZE * 8 - 1) === 1) {
// still values to read
const { result, remainingBuffer: remainingBuffer_childCall } = BufferHelper.numberArrayFromBuffer(remainingBuffer, typeMap, (keyOffset || 0) + VALUE_MAP_HEADER_SIZE * 8 - 1);
return {
result: [...data, ...result],
remainingBuffer: remainingBuffer_childCall
};
}
return {
result: data,
remainingBuffer: remainingBuffer
};
}
static UInt8ToBuffer(tinyInt) {
if (tinyInt < 0 || tinyInt > 2 ** (exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.UInt8] * 8) - 1) {
throw new Error(`BufferHelper.TIntToBuffer: value out of domain: ${tinyInt}`);
}
const result = Buffer.alloc(exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.UInt8]);
result.writeUInt8(tinyInt);
return result;
}
static UInt8FromBuffer(buffer) {
if (buffer.byteLength < exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.UInt8]) {
throw new Error('BufferHelper.TIntFromBuffer: not enough bytes remaining');
}
const instance = buffer.readUInt8();
return {
instance: instance,
remainingBuffer: buffer.subarray(exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.UInt8])
};
}
static BooleanToBuffer(bool) {
const result = Buffer.alloc(exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.Boolean]);
result.writeInt8(bool ? 1 : 0);
return result;
}
static BooleanFromBuffer(buffer) {
if (buffer.byteLength < exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.Boolean]) {
throw new Error('BufferHelper.BooleanFromBuffer: not enough bytes remaining');
}
const instance = buffer.readInt8();
return {
instance: instance === 0 ? false : true,
remainingBuffer: buffer.subarray(exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.Boolean])
};
}
static UIntToBuffer(int, message) {
if (int < 0 || int > 2 ** (exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.UInt] * 8) - 1) {
throw new Error(`BufferHelper.UIntToBuffer: value out of domain: ${int} : ${message}`);
}
const result = Buffer.alloc(exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.UInt]);
result.writeUInt32LE(int);
return result;
}
static UIntFromBuffer(buffer) {
if (buffer.byteLength < exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.UInt]) {
throw new Error('BufferHelper.UIntFromBuffer: not enough bytes remaining');
}
const instance = buffer.readUInt32LE();
return {
instance,
remainingBuffer: buffer.subarray(exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.UInt])
};
}
static DoubleToBuffer(double) {
const result = Buffer.alloc(exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.Double]);
result.writeDoubleLE(double);
return result;
}
static DoubleFromBuffer(buffer) {
if (buffer.byteLength < exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.Double]) {
throw new Error('BufferHelper.DoubleFromBuffer: not enough bytes remaining');
}
const instance = buffer.readDoubleLE();
return {
instance,
remainingBuffer: buffer.subarray(exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.Double])
};
}
static String2LToBuffer(string) {
if (string.length > exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.String2L]) {
throw new Error('BufferHelper.String2LToBuffer: only supports string smaller than 2^16 - 1 characters');
}
const string_Buffer = Buffer.from(string);
const length_Buffer = Buffer.alloc(2);
length_Buffer.writeUInt16LE(string_Buffer.byteLength);
return Buffer.concat([length_Buffer, string_Buffer]);
}
static String2LFromBuffer(buffer) {
if (buffer.byteLength < 2) {
throw new Error('BufferHelper.String2LFromBuffer: not enough bytes remaining');
}
const length = buffer.readUInt16LE();
if (buffer.byteLength - 2 - length < 0) {
throw new Error('BufferHelper.String2LFromBuffer: not enough bytes remaining');
}
const string = buffer.subarray(2, 2 + length).toString('utf-8');
return {
instance: string,
remainingBuffer: buffer.subarray(2 + length)
};
}
static String4LToBuffer(string) {
if (string.length > exports.PRIMITIVE_BUFFER_TYPES_BYTE_SIZES[types_1.PrimitiveBufferTypes.String4L]) {
throw new Error('BufferHelper.String4LToBuffer: only supports string smaller than 2^32 - 1 characters');
}
const string_Buffer = Buffer.from(string);
const length_Buffer = Buffer.alloc(4);
length_Buffer.writeUInt32LE(string_Buffer.byteLength);
return Buffer.concat([length_Buffer, string_Buffer]);
}
static String4LFromBuffer(buffer) {
if (buffer.byteLength < 4) {
throw new Error('BufferHelper.String4LFromBuffer: not enough bytes remaining');
}
const length = buffer.readUInt32LE();
if (buffer.byteLength - 4 - length < 0) {
throw new Error('BufferHelper.String4LFromBuffer: not enough bytes remaining');
}
const string = buffer.subarray(4, 4 + length).toString('utf-8');
return {
instance: string,
remainingBuffer: buffer.subarray(4 + length)
};
}
static readBit(buffer, bit) {
const i = Math.floor(bit / 8);
return (buffer[i] >> (bit % 8)) % 2;
}
static setBit(buffer, bit, value) {
const i = Math.floor(bit / 8);
if (value === 0) {
buffer[i] &= ~(1 << (bit % 8));
}
else {
buffer[i] |= (1 << (bit % 8));
}
}
static compressBuffer(buffer) {
return __awaiter(this, void 0, void 0, function* () {
return new Promise((resolve, reject) => {
zlib_1.default.deflate(buffer, (error, result) => {
if (error === null) {
resolve(result);
}
else {
reject(error);
}
});
});
});
}
static decompressBuffer(buffer, maxOutputLength = 100 * 1024 * 1024) {
return __awaiter(this, void 0, void 0, function* () {
return new Promise((resolve, reject) => {
zlib_1.default.inflate(buffer, {
maxOutputLength // protect against zip bombs
}, (error, result) => {
if (error === null) {
resolve(result);
}
else {
reject(error);
}
});
});
});
}
}
exports.BufferHelper = BufferHelper;
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