96 lines
3.2 KiB
JavaScript
96 lines
3.2 KiB
JavaScript
'use strict';
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const Types = require('../constants/types');
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const Packet = require('../packets/packet');
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const binaryReader = new Array(256);
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class BinaryRow {
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constructor(columns) {
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this.columns = columns || [];
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}
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static toPacket(columns, encoding) {
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// throw new Error('Not implemented');
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const sequenceId = 0; // TODO remove, this is calculated now in connecton
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let length = 0;
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columns.forEach(val => {
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if (val === null || typeof val === 'undefined') {
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++length;
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return;
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}
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length += Packet.lengthCodedStringLength(val.toString(10), encoding);
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});
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length = length + 2;
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const buffer = Buffer.allocUnsafe(length + 4);
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const packet = new Packet(sequenceId, buffer, 0, length + 4);
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packet.offset = 4;
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packet.writeInt8(0);
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let bitmap = 0;
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let bitValue = 1;
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columns.forEach(parameter => {
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if (parameter.type === Types.NULL) {
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bitmap += bitValue;
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}
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bitValue *= 2;
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if (bitValue === 256) {
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packet.writeInt8(bitmap);
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bitmap = 0;
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bitValue = 1;
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}
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});
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if (bitValue !== 1) {
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packet.writeInt8(bitmap);
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}
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columns.forEach(val => {
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if (val === null) {
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packet.writeNull();
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return;
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}
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if (typeof val === 'undefined') {
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packet.writeInt8(0);
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return;
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}
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packet.writeLengthCodedString(val.toString(10), encoding);
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});
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return packet;
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}
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// TODO: complete list of types...
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static fromPacket(fields, packet) {
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const columns = new Array(fields.length);
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packet.readInt8(); // TODO check it's 0
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const nullBitmapLength = Math.floor((fields.length + 7 + 2) / 8);
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// TODO: read and interpret null bitmap
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packet.skip(nullBitmapLength);
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for (let i = 0; i < columns.length; ++i) {
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columns[i] = binaryReader[fields[i].columnType].apply(packet);
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}
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return new BinaryRow(columns);
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}
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}
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// TODO: replace with constants.MYSQL_TYPE_*
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binaryReader[Types.DECIMAL] = Packet.prototype.readLengthCodedString;
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binaryReader[1] = Packet.prototype.readInt8; // tiny
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binaryReader[2] = Packet.prototype.readInt16; // short
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binaryReader[3] = Packet.prototype.readInt32; // long
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binaryReader[4] = Packet.prototype.readFloat; // float
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binaryReader[5] = Packet.prototype.readDouble; // double
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binaryReader[6] = Packet.prototype.assertInvalid; // null, should be skipped vie null bitmap
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binaryReader[7] = Packet.prototype.readTimestamp; // timestamp, http://dev.mysql.com/doc/internals/en/prepared-statements.html#packet-ProtocolBinary::MYSQL_TYPE_TIMESTAMP
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binaryReader[8] = Packet.prototype.readInt64; // long long
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binaryReader[9] = Packet.prototype.readInt32; // int24
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binaryReader[10] = Packet.prototype.readTimestamp; // date
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binaryReader[11] = Packet.prototype.readTime; // time, http://dev.mysql.com/doc/internals/en/prepared-statements.html#packet-ProtocolBinary::MYSQL_TYPE_TIME
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binaryReader[12] = Packet.prototype.readDateTime; // datetime, http://dev.mysql.com/doc/internals/en/prepared-statements.html#packet-ProtocolBinary::MYSQL_TYPE_DATETIME
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binaryReader[13] = Packet.prototype.readInt16; // year
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binaryReader[Types.VAR_STRING] = Packet.prototype.readLengthCodedString; // var string
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module.exports = BinaryRow;
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