930 lines
24 KiB
JavaScript
930 lines
24 KiB
JavaScript
// This file was modified by Oracle on June 1, 2021.
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// A comment describing some changes in the strict default SQL mode regarding
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// non-standard dates was introduced.
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// Modifications copyright (c) 2021, Oracle and/or its affiliates.
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'use strict';
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const ErrorCodeToName = require('../constants/errors.js');
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const NativeBuffer = require('buffer').Buffer;
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const Long = require('long');
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const StringParser = require('../parsers/string.js');
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const INVALID_DATE = new Date(NaN);
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// this is nearly duplicate of previous function so generated code is not slower
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// due to "if (dateStrings)" branching
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const pad = '000000000000';
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function leftPad(num, value) {
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const s = value.toString();
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// if we don't need to pad
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if (s.length >= num) {
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return s;
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}
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return (pad + s).slice(-num);
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}
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// The whole reason parse* function below exist
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// is because String creation is relatively expensive (at least with V8), and if we have
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// a buffer with "12345" content ideally we would like to bypass intermediate
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// "12345" string creation and directly build 12345 number out of
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// <Buffer 31 32 33 34 35> data.
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// In my benchmarks the difference is ~25M 8-digit numbers per second vs
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// 4.5 M using Number(packet.readLengthCodedString())
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// not used when size is close to max precision as series of *10 accumulate error
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// and approximate result mihgt be diffreent from (approximate as well) Number(bigNumStringValue))
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// In the futire node version if speed difference is smaller parse* functions might be removed
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// don't consider them as Packet public API
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const minus = '-'.charCodeAt(0);
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const plus = '+'.charCodeAt(0);
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// TODO: handle E notation
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const dot = '.'.charCodeAt(0);
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const exponent = 'e'.charCodeAt(0);
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const exponentCapital = 'E'.charCodeAt(0);
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class Packet {
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constructor(id, buffer, start, end) {
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// hot path, enable checks when testing only
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// if (!Buffer.isBuffer(buffer) || typeof start == 'undefined' || typeof end == 'undefined')
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// throw new Error('invalid packet');
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this.sequenceId = id;
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this.numPackets = 1;
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this.buffer = buffer;
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this.start = start;
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this.offset = start + 4;
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this.end = end;
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}
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// ==============================
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// readers
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// ==============================
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reset() {
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this.offset = this.start + 4;
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}
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length() {
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return this.end - this.start;
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}
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slice() {
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return this.buffer.slice(this.start, this.end);
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}
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dump() {
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// eslint-disable-next-line no-console
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console.log(
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[this.buffer.asciiSlice(this.start, this.end)],
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this.buffer.slice(this.start, this.end),
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this.length(),
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this.sequenceId
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);
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}
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haveMoreData() {
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return this.end > this.offset;
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}
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skip(num) {
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this.offset += num;
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}
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readInt8() {
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return this.buffer[this.offset++];
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}
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readInt16() {
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this.offset += 2;
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return this.buffer.readUInt16LE(this.offset - 2);
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}
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readInt24() {
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return this.readInt16() + (this.readInt8() << 16);
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}
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readInt32() {
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this.offset += 4;
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return this.buffer.readUInt32LE(this.offset - 4);
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}
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readSInt8() {
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return this.buffer.readInt8(this.offset++);
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}
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readSInt16() {
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this.offset += 2;
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return this.buffer.readInt16LE(this.offset - 2);
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}
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readSInt32() {
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this.offset += 4;
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return this.buffer.readInt32LE(this.offset - 4);
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}
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readInt64JSNumber() {
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const word0 = this.readInt32();
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const word1 = this.readInt32();
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const l = new Long(word0, word1, true);
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return l.toNumber();
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}
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readSInt64JSNumber() {
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const word0 = this.readInt32();
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const word1 = this.readInt32();
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if (!(word1 & 0x80000000)) {
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return word0 + 0x100000000 * word1;
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}
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const l = new Long(word0, word1, false);
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return l.toNumber();
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}
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readInt64String() {
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const word0 = this.readInt32();
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const word1 = this.readInt32();
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const res = new Long(word0, word1, true);
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return res.toString();
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}
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readSInt64String() {
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const word0 = this.readInt32();
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const word1 = this.readInt32();
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const res = new Long(word0, word1, false);
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return res.toString();
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}
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readInt64() {
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const word0 = this.readInt32();
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const word1 = this.readInt32();
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let res = new Long(word0, word1, true);
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const resNumber = res.toNumber();
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const resString = res.toString();
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res = resNumber.toString() === resString ? resNumber : resString;
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return res;
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}
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readSInt64() {
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const word0 = this.readInt32();
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const word1 = this.readInt32();
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let res = new Long(word0, word1, false);
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const resNumber = res.toNumber();
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const resString = res.toString();
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res = resNumber.toString() === resString ? resNumber : resString;
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return res;
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}
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isEOF() {
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return this.buffer[this.offset] === 0xfe && this.length() < 13;
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}
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eofStatusFlags() {
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return this.buffer.readInt16LE(this.offset + 3);
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}
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eofWarningCount() {
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return this.buffer.readInt16LE(this.offset + 1);
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}
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readLengthCodedNumber(bigNumberStrings, signed) {
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const byte1 = this.buffer[this.offset++];
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if (byte1 < 251) {
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return byte1;
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}
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return this.readLengthCodedNumberExt(byte1, bigNumberStrings, signed);
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}
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readLengthCodedNumberSigned(bigNumberStrings) {
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return this.readLengthCodedNumber(bigNumberStrings, true);
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}
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readLengthCodedNumberExt(tag, bigNumberStrings, signed) {
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let word0, word1;
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let res;
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if (tag === 0xfb) {
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return null;
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}
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if (tag === 0xfc) {
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return this.readInt8() + (this.readInt8() << 8);
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}
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if (tag === 0xfd) {
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return this.readInt8() + (this.readInt8() << 8) + (this.readInt8() << 16);
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}
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if (tag === 0xfe) {
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// TODO: check version
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// Up to MySQL 3.22, 0xfe was followed by a 4-byte integer.
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word0 = this.readInt32();
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word1 = this.readInt32();
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if (word1 === 0) {
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return word0; // don't convert to float if possible
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}
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if (word1 < 2097152) {
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// max exact float point int, 2^52 / 2^32
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return word1 * 0x100000000 + word0;
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}
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res = new Long(word0, word1, !signed); // Long need unsigned
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const resNumber = res.toNumber();
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const resString = res.toString();
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res = resNumber.toString() === resString ? resNumber : resString;
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return bigNumberStrings ? resString : res;
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}
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// eslint-disable-next-line no-console
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console.trace();
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throw new Error(`Should not reach here: ${tag}`);
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}
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readFloat() {
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const res = this.buffer.readFloatLE(this.offset);
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this.offset += 4;
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return res;
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}
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readDouble() {
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const res = this.buffer.readDoubleLE(this.offset);
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this.offset += 8;
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return res;
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}
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readBuffer(len) {
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if (typeof len === 'undefined') {
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len = this.end - this.offset;
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}
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this.offset += len;
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return this.buffer.slice(this.offset - len, this.offset);
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}
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// DATE, DATETIME and TIMESTAMP
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readDateTime(timezone) {
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if (!timezone || timezone === 'Z' || timezone === 'local') {
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const length = this.readInt8();
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if (length === 0xfb) {
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return null;
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}
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let y = 0;
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let m = 0;
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let d = 0;
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let H = 0;
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let M = 0;
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let S = 0;
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let ms = 0;
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if (length > 3) {
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y = this.readInt16();
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m = this.readInt8();
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d = this.readInt8();
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}
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if (length > 6) {
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H = this.readInt8();
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M = this.readInt8();
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S = this.readInt8();
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}
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if (length > 10) {
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ms = this.readInt32() / 1000;
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}
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// NO_ZERO_DATE mode and NO_ZERO_IN_DATE mode are part of the strict
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// default SQL mode used by MySQL 8.0. This means that non-standard
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// dates like '0000-00-00' become NULL. For older versions and other
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// possible MySQL flavours we still need to account for the
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// non-standard behaviour.
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if (y + m + d + H + M + S + ms === 0) {
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return INVALID_DATE;
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}
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if (timezone === 'Z') {
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return new Date(Date.UTC(y, m - 1, d, H, M, S, ms));
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}
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return new Date(y, m - 1, d, H, M, S, ms);
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}
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let str = this.readDateTimeString(6, 'T');
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if (str.length === 10) {
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str += 'T00:00:00';
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}
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return new Date(str + timezone);
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}
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readDateTimeString(decimals, timeSep) {
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const length = this.readInt8();
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let y = 0;
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let m = 0;
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let d = 0;
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let H = 0;
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let M = 0;
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let S = 0;
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let ms = 0;
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let str;
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if (length > 3) {
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y = this.readInt16();
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m = this.readInt8();
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d = this.readInt8();
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str = [leftPad(4, y), leftPad(2, m), leftPad(2, d)].join('-');
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}
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if (length > 6) {
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H = this.readInt8();
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M = this.readInt8();
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S = this.readInt8();
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str += `${timeSep || ' '}${[
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leftPad(2, H),
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leftPad(2, M),
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leftPad(2, S)
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].join(':')}`;
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}
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if (length > 10) {
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ms = this.readInt32();
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str += '.';
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if (decimals) {
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ms = leftPad(6, ms);
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if (ms.length > decimals) {
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ms = ms.substring(0, decimals); // rounding is done at the MySQL side, only 0 are here
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}
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}
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str += ms;
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}
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return str;
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}
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// TIME - value as a string, Can be negative
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readTimeString(convertTtoMs) {
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const length = this.readInt8();
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if (length === 0) {
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return '00:00:00';
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}
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const sign = this.readInt8() ? -1 : 1; // 'isNegative' flag byte
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let d = 0;
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let H = 0;
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let M = 0;
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let S = 0;
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let ms = 0;
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if (length > 6) {
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d = this.readInt32();
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H = this.readInt8();
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M = this.readInt8();
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S = this.readInt8();
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}
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if (length > 10) {
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ms = this.readInt32();
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}
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if (convertTtoMs) {
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H += d * 24;
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M += H * 60;
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S += M * 60;
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ms += S * 1000;
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ms *= sign;
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return ms;
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}
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// Format follows mySQL TIME format ([-][h]hh:mm:ss[.u[u[u[u[u[u]]]]]])
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// For positive times below 24 hours, this makes it equal to ISO 8601 times
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return (
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(sign === -1 ? '-' : '') +
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[leftPad(2, d * 24 + H), leftPad(2, M), leftPad(2, S)].join(':') +
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(ms ? `.${ms}`.replace(/0+$/, '') : '')
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);
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}
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readLengthCodedString(encoding) {
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const len = this.readLengthCodedNumber();
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// TODO: check manually first byte here to avoid polymorphic return type?
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if (len === null) {
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return null;
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}
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this.offset += len;
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// TODO: Use characterSetCode to get proper encoding
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// https://github.com/sidorares/node-mysql2/pull/374
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return StringParser.decode(
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this.buffer,
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encoding,
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this.offset - len,
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this.offset
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);
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}
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readLengthCodedBuffer() {
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const len = this.readLengthCodedNumber();
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if (len === null) {
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return null;
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}
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return this.readBuffer(len);
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}
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readNullTerminatedString(encoding) {
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const start = this.offset;
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let end = this.offset;
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while (this.buffer[end]) {
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end = end + 1; // TODO: handle OOB check
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}
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this.offset = end + 1;
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return StringParser.decode(this.buffer, encoding, start, end);
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}
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// TODO reuse?
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readString(len, encoding) {
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if (typeof len === 'string' && typeof encoding === 'undefined') {
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encoding = len;
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len = undefined;
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}
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if (typeof len === 'undefined') {
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len = this.end - this.offset;
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}
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this.offset += len;
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return StringParser.decode(
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this.buffer,
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encoding,
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this.offset - len,
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this.offset
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);
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}
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parseInt(len, supportBigNumbers) {
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if (len === null) {
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return null;
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}
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if (len >= 14 && !supportBigNumbers) {
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const s = this.buffer.toString('ascii', this.offset, this.offset + len);
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this.offset += len;
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return Number(s);
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}
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let result = 0;
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const start = this.offset;
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const end = this.offset + len;
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let sign = 1;
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if (len === 0) {
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return 0; // TODO: assert? exception?
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}
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if (this.buffer[this.offset] === minus) {
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this.offset++;
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sign = -1;
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}
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// max precise int is 9007199254740992
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let str;
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const numDigits = end - this.offset;
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if (supportBigNumbers) {
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if (numDigits >= 15) {
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str = this.readString(end - this.offset, 'binary');
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result = parseInt(str, 10);
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if (result.toString() === str) {
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return sign * result;
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}
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return sign === -1 ? `-${str}` : str;
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}
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if (numDigits > 16) {
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str = this.readString(end - this.offset);
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return sign === -1 ? `-${str}` : str;
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}
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}
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if (this.buffer[this.offset] === plus) {
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this.offset++; // just ignore
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}
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while (this.offset < end) {
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result *= 10;
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result += this.buffer[this.offset] - 48;
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this.offset++;
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}
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const num = result * sign;
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if (!supportBigNumbers) {
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return num;
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}
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str = this.buffer.toString('ascii', start, end);
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if (num.toString() === str) {
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return num;
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}
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return str;
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}
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// note that if value of inputNumberAsString is bigger than MAX_SAFE_INTEGER
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// ( or smaller than MIN_SAFE_INTEGER ) the parseIntNoBigCheck result might be
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// different from what you would get from Number(inputNumberAsString)
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// String(parseIntNoBigCheck) <> String(Number(inputNumberAsString)) <> inputNumberAsString
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parseIntNoBigCheck(len) {
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if (len === null) {
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return null;
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}
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let result = 0;
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const end = this.offset + len;
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let sign = 1;
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if (len === 0) {
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return 0; // TODO: assert? exception?
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}
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if (this.buffer[this.offset] === minus) {
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this.offset++;
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sign = -1;
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}
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if (this.buffer[this.offset] === plus) {
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this.offset++; // just ignore
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}
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while (this.offset < end) {
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result *= 10;
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result += this.buffer[this.offset] - 48;
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this.offset++;
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}
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return result * sign;
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}
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// copy-paste from https://github.com/mysqljs/mysql/blob/master/lib/protocol/Parser.js
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parseGeometryValue() {
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const buffer = this.readLengthCodedBuffer();
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let offset = 4;
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if (buffer === null || !buffer.length) {
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return null;
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}
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function parseGeometry() {
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let x, y, i, j, numPoints, line;
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let result = null;
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const byteOrder = buffer.readUInt8(offset);
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offset += 1;
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const wkbType = byteOrder
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? buffer.readUInt32LE(offset)
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: buffer.readUInt32BE(offset);
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offset += 4;
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switch (wkbType) {
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case 1: // WKBPoint
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x = byteOrder
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? buffer.readDoubleLE(offset)
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: buffer.readDoubleBE(offset);
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offset += 8;
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y = byteOrder
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? buffer.readDoubleLE(offset)
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: buffer.readDoubleBE(offset);
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offset += 8;
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result = { x: x, y: y };
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break;
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case 2: // WKBLineString
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numPoints = byteOrder
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? buffer.readUInt32LE(offset)
|
|
: buffer.readUInt32BE(offset);
|
|
offset += 4;
|
|
result = [];
|
|
for (i = numPoints; i > 0; i--) {
|
|
x = byteOrder
|
|
? buffer.readDoubleLE(offset)
|
|
: buffer.readDoubleBE(offset);
|
|
offset += 8;
|
|
y = byteOrder
|
|
? buffer.readDoubleLE(offset)
|
|
: buffer.readDoubleBE(offset);
|
|
offset += 8;
|
|
result.push({ x: x, y: y });
|
|
}
|
|
break;
|
|
case 3: // WKBPolygon
|
|
// eslint-disable-next-line no-case-declarations
|
|
const numRings = byteOrder
|
|
? buffer.readUInt32LE(offset)
|
|
: buffer.readUInt32BE(offset);
|
|
offset += 4;
|
|
result = [];
|
|
for (i = numRings; i > 0; i--) {
|
|
numPoints = byteOrder
|
|
? buffer.readUInt32LE(offset)
|
|
: buffer.readUInt32BE(offset);
|
|
offset += 4;
|
|
line = [];
|
|
for (j = numPoints; j > 0; j--) {
|
|
x = byteOrder
|
|
? buffer.readDoubleLE(offset)
|
|
: buffer.readDoubleBE(offset);
|
|
offset += 8;
|
|
y = byteOrder
|
|
? buffer.readDoubleLE(offset)
|
|
: buffer.readDoubleBE(offset);
|
|
offset += 8;
|
|
line.push({ x: x, y: y });
|
|
}
|
|
result.push(line);
|
|
}
|
|
break;
|
|
case 4: // WKBMultiPoint
|
|
case 5: // WKBMultiLineString
|
|
case 6: // WKBMultiPolygon
|
|
case 7: // WKBGeometryCollection
|
|
// eslint-disable-next-line no-case-declarations
|
|
const num = byteOrder
|
|
? buffer.readUInt32LE(offset)
|
|
: buffer.readUInt32BE(offset);
|
|
offset += 4;
|
|
result = [];
|
|
for (i = num; i > 0; i--) {
|
|
result.push(parseGeometry());
|
|
}
|
|
break;
|
|
}
|
|
return result;
|
|
}
|
|
return parseGeometry();
|
|
}
|
|
|
|
parseVector() {
|
|
const bufLen = this.readLengthCodedNumber();
|
|
const vectorEnd = this.offset + bufLen;
|
|
const result = [];
|
|
while (this.offset < vectorEnd && this.offset < this.end) {
|
|
result.push(this.readFloat());
|
|
}
|
|
return result;
|
|
}
|
|
|
|
parseDate(timezone) {
|
|
const strLen = this.readLengthCodedNumber();
|
|
if (strLen === null) {
|
|
return null;
|
|
}
|
|
if (strLen !== 10) {
|
|
// we expect only YYYY-MM-DD here.
|
|
// if for some reason it's not the case return invalid date
|
|
return new Date(NaN);
|
|
}
|
|
const y = this.parseInt(4);
|
|
this.offset++; // -
|
|
const m = this.parseInt(2);
|
|
this.offset++; // -
|
|
const d = this.parseInt(2);
|
|
if (!timezone || timezone === 'local') {
|
|
return new Date(y, m - 1, d);
|
|
}
|
|
if (timezone === 'Z') {
|
|
return new Date(Date.UTC(y, m - 1, d));
|
|
}
|
|
return new Date(
|
|
`${leftPad(4, y)}-${leftPad(2, m)}-${leftPad(2, d)}T00:00:00${timezone}`
|
|
);
|
|
}
|
|
|
|
parseDateTime(timezone) {
|
|
const str = this.readLengthCodedString('binary');
|
|
if (str === null) {
|
|
return null;
|
|
}
|
|
if (!timezone || timezone === 'local') {
|
|
return new Date(str);
|
|
}
|
|
return new Date(`${str}${timezone}`);
|
|
}
|
|
|
|
parseFloat(len) {
|
|
if (len === null) {
|
|
return null;
|
|
}
|
|
let result = 0;
|
|
const end = this.offset + len;
|
|
let factor = 1;
|
|
let pastDot = false;
|
|
let charCode = 0;
|
|
if (len === 0) {
|
|
return 0; // TODO: assert? exception?
|
|
}
|
|
if (this.buffer[this.offset] === minus) {
|
|
this.offset++;
|
|
factor = -1;
|
|
}
|
|
if (this.buffer[this.offset] === plus) {
|
|
this.offset++; // just ignore
|
|
}
|
|
while (this.offset < end) {
|
|
charCode = this.buffer[this.offset];
|
|
if (charCode === dot) {
|
|
pastDot = true;
|
|
this.offset++;
|
|
} else if (charCode === exponent || charCode === exponentCapital) {
|
|
this.offset++;
|
|
const exponentValue = this.parseInt(end - this.offset);
|
|
return (result / factor) * Math.pow(10, exponentValue);
|
|
} else {
|
|
result *= 10;
|
|
result += this.buffer[this.offset] - 48;
|
|
this.offset++;
|
|
if (pastDot) {
|
|
factor = factor * 10;
|
|
}
|
|
}
|
|
}
|
|
return result / factor;
|
|
}
|
|
|
|
parseLengthCodedIntNoBigCheck() {
|
|
return this.parseIntNoBigCheck(this.readLengthCodedNumber());
|
|
}
|
|
|
|
parseLengthCodedInt(supportBigNumbers) {
|
|
return this.parseInt(this.readLengthCodedNumber(), supportBigNumbers);
|
|
}
|
|
|
|
parseLengthCodedIntString() {
|
|
return this.readLengthCodedString('binary');
|
|
}
|
|
|
|
parseLengthCodedFloat() {
|
|
return this.parseFloat(this.readLengthCodedNumber());
|
|
}
|
|
|
|
peekByte() {
|
|
return this.buffer[this.offset];
|
|
}
|
|
|
|
// OxFE is often used as "Alt" flag - not ok, not error.
|
|
// For example, it's first byte of AuthSwitchRequest
|
|
isAlt() {
|
|
return this.peekByte() === 0xfe;
|
|
}
|
|
|
|
isError() {
|
|
return this.peekByte() === 0xff;
|
|
}
|
|
|
|
asError(encoding) {
|
|
this.reset();
|
|
this.readInt8(); // fieldCount
|
|
const errorCode = this.readInt16();
|
|
let sqlState = '';
|
|
if (this.buffer[this.offset] === 0x23) {
|
|
this.skip(1);
|
|
sqlState = this.readBuffer(5).toString();
|
|
}
|
|
const message = this.readString(undefined, encoding);
|
|
const err = new Error(message);
|
|
err.code = ErrorCodeToName[errorCode];
|
|
err.errno = errorCode;
|
|
err.sqlState = sqlState;
|
|
err.sqlMessage = message;
|
|
return err;
|
|
}
|
|
|
|
writeInt32(n) {
|
|
this.buffer.writeUInt32LE(n, this.offset);
|
|
this.offset += 4;
|
|
}
|
|
|
|
writeInt24(n) {
|
|
this.writeInt8(n & 0xff);
|
|
this.writeInt16(n >> 8);
|
|
}
|
|
|
|
writeInt16(n) {
|
|
this.buffer.writeUInt16LE(n, this.offset);
|
|
this.offset += 2;
|
|
}
|
|
|
|
writeInt8(n) {
|
|
this.buffer.writeUInt8(n, this.offset);
|
|
this.offset++;
|
|
}
|
|
|
|
writeDouble(n) {
|
|
this.buffer.writeDoubleLE(n, this.offset);
|
|
this.offset += 8;
|
|
}
|
|
|
|
writeBuffer(b) {
|
|
b.copy(this.buffer, this.offset);
|
|
this.offset += b.length;
|
|
}
|
|
|
|
writeNull() {
|
|
this.buffer[this.offset] = 0xfb;
|
|
this.offset++;
|
|
}
|
|
|
|
// TODO: refactor following three?
|
|
writeNullTerminatedString(s, encoding) {
|
|
const buf = StringParser.encode(s, encoding);
|
|
this.buffer.length && buf.copy(this.buffer, this.offset);
|
|
this.offset += buf.length;
|
|
this.writeInt8(0);
|
|
}
|
|
|
|
writeString(s, encoding) {
|
|
if (s === null) {
|
|
this.writeInt8(0xfb);
|
|
return;
|
|
}
|
|
if (s.length === 0) {
|
|
return;
|
|
}
|
|
// const bytes = Buffer.byteLength(s, 'utf8');
|
|
// this.buffer.write(s, this.offset, bytes, 'utf8');
|
|
// this.offset += bytes;
|
|
const buf = StringParser.encode(s, encoding);
|
|
this.buffer.length && buf.copy(this.buffer, this.offset);
|
|
this.offset += buf.length;
|
|
}
|
|
|
|
writeLengthCodedString(s, encoding) {
|
|
const buf = StringParser.encode(s, encoding);
|
|
this.writeLengthCodedNumber(buf.length);
|
|
this.buffer.length && buf.copy(this.buffer, this.offset);
|
|
this.offset += buf.length;
|
|
}
|
|
|
|
writeLengthCodedBuffer(b) {
|
|
this.writeLengthCodedNumber(b.length);
|
|
b.copy(this.buffer, this.offset);
|
|
this.offset += b.length;
|
|
}
|
|
|
|
writeLengthCodedNumber(n) {
|
|
if (n < 0xfb) {
|
|
return this.writeInt8(n);
|
|
}
|
|
if (n < 0xffff) {
|
|
this.writeInt8(0xfc);
|
|
return this.writeInt16(n);
|
|
}
|
|
if (n < 0xffffff) {
|
|
this.writeInt8(0xfd);
|
|
return this.writeInt24(n);
|
|
}
|
|
if (n === null) {
|
|
return this.writeInt8(0xfb);
|
|
}
|
|
// TODO: check that n is out of int precision
|
|
this.writeInt8(0xfe);
|
|
this.buffer.writeUInt32LE(n, this.offset);
|
|
this.offset += 4;
|
|
this.buffer.writeUInt32LE(n >> 32, this.offset);
|
|
this.offset += 4;
|
|
return this.offset;
|
|
}
|
|
|
|
writeDate(d, timezone) {
|
|
this.buffer.writeUInt8(11, this.offset);
|
|
if (!timezone || timezone === 'local') {
|
|
this.buffer.writeUInt16LE(d.getFullYear(), this.offset + 1);
|
|
this.buffer.writeUInt8(d.getMonth() + 1, this.offset + 3);
|
|
this.buffer.writeUInt8(d.getDate(), this.offset + 4);
|
|
this.buffer.writeUInt8(d.getHours(), this.offset + 5);
|
|
this.buffer.writeUInt8(d.getMinutes(), this.offset + 6);
|
|
this.buffer.writeUInt8(d.getSeconds(), this.offset + 7);
|
|
this.buffer.writeUInt32LE(d.getMilliseconds() * 1000, this.offset + 8);
|
|
} else {
|
|
if (timezone !== 'Z') {
|
|
const offset =
|
|
(timezone[0] === '-' ? -1 : 1) *
|
|
(parseInt(timezone.substring(1, 3), 10) * 60 +
|
|
parseInt(timezone.substring(4), 10));
|
|
if (offset !== 0) {
|
|
d = new Date(d.getTime() + 60000 * offset);
|
|
}
|
|
}
|
|
this.buffer.writeUInt16LE(d.getUTCFullYear(), this.offset + 1);
|
|
this.buffer.writeUInt8(d.getUTCMonth() + 1, this.offset + 3);
|
|
this.buffer.writeUInt8(d.getUTCDate(), this.offset + 4);
|
|
this.buffer.writeUInt8(d.getUTCHours(), this.offset + 5);
|
|
this.buffer.writeUInt8(d.getUTCMinutes(), this.offset + 6);
|
|
this.buffer.writeUInt8(d.getUTCSeconds(), this.offset + 7);
|
|
this.buffer.writeUInt32LE(d.getUTCMilliseconds() * 1000, this.offset + 8);
|
|
}
|
|
this.offset += 12;
|
|
}
|
|
|
|
writeHeader(sequenceId) {
|
|
const offset = this.offset;
|
|
this.offset = 0;
|
|
this.writeInt24(this.buffer.length - 4);
|
|
this.writeInt8(sequenceId);
|
|
this.offset = offset;
|
|
}
|
|
|
|
clone() {
|
|
return new Packet(this.sequenceId, this.buffer, this.start, this.end);
|
|
}
|
|
|
|
type() {
|
|
if (this.isEOF()) {
|
|
return 'EOF';
|
|
}
|
|
if (this.isError()) {
|
|
return 'Error';
|
|
}
|
|
if (this.buffer[this.offset] === 0) {
|
|
return 'maybeOK'; // could be other packet types as well
|
|
}
|
|
return '';
|
|
}
|
|
|
|
static lengthCodedNumberLength(n) {
|
|
if (n < 0xfb) {
|
|
return 1;
|
|
}
|
|
if (n < 0xffff) {
|
|
return 3;
|
|
}
|
|
if (n < 0xffffff) {
|
|
return 5;
|
|
}
|
|
return 9;
|
|
}
|
|
|
|
static lengthCodedStringLength(str, encoding) {
|
|
const buf = StringParser.encode(str, encoding);
|
|
const slen = buf.length;
|
|
return Packet.lengthCodedNumberLength(slen) + slen;
|
|
}
|
|
|
|
static MockBuffer() {
|
|
const noop = function () {};
|
|
const res = Buffer.alloc(0);
|
|
for (const op in NativeBuffer.prototype) {
|
|
if (typeof res[op] === 'function') {
|
|
res[op] = noop;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
}
|
|
|
|
module.exports = Packet;
|