Backend half

SerpentRace_Backend/node_modules/mariadb/lib/cmd/decoder/binary-decoder.js

@@ -0,0 +1,282 @@
+//  SPDX-License-Identifier: LGPL-2.1-or-later
+//  Copyright (c) 2015-2024 MariaDB Corporation Ab
+
+'use strict';
+
+const FieldType = require('../../const/field-type');
+const Errors = require('../../misc/errors');
+
+module.exports.newRow = function (packet, columns) {
+  packet.skip(1); // skip 0x00 header.
+  const len = ~~((columns.length + 9) / 8);
+  const nullBitMap = new Array(len);
+  for (let i = 0; i < len; i++) nullBitMap[i] = packet.readUInt8();
+  return nullBitMap;
+};
+module.exports.castWrapper = function (column, packet, opts, nullBitmap, index) {
+  column.string = () => (isNullBitmap(index, nullBitmap) ? null : packet.readStringLengthEncoded());
+  column.buffer = () => (isNullBitmap(index, nullBitmap) ? null : packet.readBufferLengthEncoded());
+  column.float = () => (isNullBitmap(index, nullBitmap) ? null : packet.readFloat());
+  column.tiny = () =>
+    isNullBitmap(index, nullBitmap) ? null : column.signed() ? packet.readInt8() : packet.readUInt8();
+  column.short = () =>
+    isNullBitmap(index, nullBitmap) ? null : column.signed() ? packet.readInt16() : packet.readUInt16();
+  column.int = () => (isNullBitmap(index, nullBitmap) ? null : packet.readInt32());
+  column.long = () => (isNullBitmap(index, nullBitmap) ? null : packet.readBigInt64());
+  column.decimal = () => (isNullBitmap(index, nullBitmap) ? null : packet.readDecimalLengthEncoded());
+  column.date = () => (isNullBitmap(index, nullBitmap) ? null : packet.readBinaryDate(opts));
+  column.datetime = () => (isNullBitmap(index, nullBitmap) ? null : packet.readBinaryDateTime());
+
+  column.geometry = () => {
+    let defaultVal = null;
+    if (column.dataTypeName) {
+      switch (column.dataTypeName) {
+        case 'point':
+          defaultVal = { type: 'Point' };
+          break;
+        case 'linestring':
+          defaultVal = { type: 'LineString' };
+          break;
+        case 'polygon':
+          defaultVal = { type: 'Polygon' };
+          break;
+        case 'multipoint':
+          defaultVal = { type: 'MultiPoint' };
+          break;
+        case 'multilinestring':
+          defaultVal = { type: 'MultiLineString' };
+          break;
+        case 'multipolygon':
+          defaultVal = { type: 'MultiPolygon' };
+          break;
+        default:
+          defaultVal = { type: column.dataTypeName };
+          break;
+      }
+    }
+
+    if (isNullBitmap(index, nullBitmap)) {
+      return defaultVal;
+    }
+    return packet.readGeometry(defaultVal);
+  };
+};
+module.exports.parser = function (col, opts) {
+  // set reader function read(col, packet, index, nullBitmap, opts, throwUnexpectedError)
+  // this permit for multi-row result-set to avoid resolving type parsing each data.
+
+  // return constant parser (function not depending on column info other than type)
+  const defaultParser = col.signed()
+    ? DEFAULT_SIGNED_PARSER_TYPE[col.columnType]
+    : DEFAULT_UNSIGNED_PARSER_TYPE[col.columnType];
+  if (defaultParser) return defaultParser;
+
+  // parser depending on column info
+  switch (col.columnType) {
+    case FieldType.BIGINT:
+      if (col.signed()) {
+        return opts.bigIntAsNumber || opts.supportBigNumbers ? readBigintAsIntBinarySigned : readBigintBinarySigned;
+      }
+      return opts.bigIntAsNumber || opts.supportBigNumbers ? readBigintAsIntBinaryUnsigned : readBigintBinaryUnsigned;
+
+    case FieldType.DATETIME:
+    case FieldType.TIMESTAMP:
+      return opts.dateStrings ? readTimestampStringBinary.bind(null, col.scale) : readTimestampBinary;
+
+    case FieldType.DECIMAL:
+    case FieldType.NEWDECIMAL:
+      return col.scale === 0 ? readDecimalAsIntBinary : readDecimalBinary;
+
+    case FieldType.GEOMETRY:
+      let defaultVal = col.__getDefaultGeomVal();
+      return readGeometryBinary.bind(null, defaultVal);
+
+    case FieldType.BIT:
+      if (col.columnLength === 1 && opts.bitOneIsBoolean) {
+        return readBitBinaryBoolean;
+      }
+      return readBinaryBuffer;
+    case FieldType.JSON:
+      return opts.jsonStrings ? readStringBinary : readJsonBinary;
+
+    default:
+      if (col.dataTypeFormat && col.dataTypeFormat === 'json' && opts.autoJsonMap) {
+        return readJsonBinary;
+      }
+      if (col.collation.index === 63) {
+        return readBinaryBuffer;
+      }
+      if (col.isSet()) {
+        return readBinarySet;
+      }
+      return readStringBinary;
+  }
+};
+
+const isNullBitmap = (index, nullBitmap) => {
+  return (nullBitmap[~~((index + 2) / 8)] & (1 << (index + 2) % 8)) > 0;
+};
+
+const readTinyBinarySigned = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readInt8();
+const readTinyBinaryUnsigned = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readUInt8();
+const readShortBinarySigned = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readInt16();
+const readShortBinaryUnsigned = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readUInt16();
+const readMediumBinarySigned = (packet, opts, throwUnexpectedError, nullBitmap, index) => {
+  if (isNullBitmap(index, nullBitmap)) {
+    return null;
+  }
+  const result = packet.readInt24();
+  packet.skip(1); // MEDIUMINT is encoded on 4 bytes in exchanges !
+  return result;
+};
+const readMediumBinaryUnsigned = (packet, opts, throwUnexpectedError, nullBitmap, index) => {
+  if (isNullBitmap(index, nullBitmap)) {
+    return null;
+  }
+  const result = packet.readUInt24();
+  packet.skip(1); // MEDIUMINT is encoded on 4 bytes in exchanges !
+  return result;
+};
+const readIntBinarySigned = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readInt32();
+const readIntBinaryUnsigned = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readUInt32();
+const readFloatBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readFloat();
+const readDoubleBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readDouble();
+const readBigintBinaryUnsigned = function (packet, opts, throwUnexpectedError, nullBitmap, index) {
+  if (isNullBitmap(index, nullBitmap)) return null;
+  return packet.readBigUInt64();
+};
+const readBigintBinarySigned = function (packet, opts, throwUnexpectedError, nullBitmap, index) {
+  if (isNullBitmap(index, nullBitmap)) return null;
+  return packet.readBigInt64();
+};
+
+const readBigintAsIntBinaryUnsigned = function (packet, opts, throwUnexpectedError, nullBitmap, index) {
+  if (isNullBitmap(index, nullBitmap)) return null;
+  const val = packet.readBigUInt64();
+  if (opts.bigIntAsNumber && opts.checkNumberRange && !Number.isSafeInteger(Number(val))) {
+    return throwUnexpectedError(
+      `value ${val} can't safely be converted to number`,
+      false,
+      null,
+      '42000',
+      Errors.ER_PARSING_PRECISION
+    );
+  }
+  if (opts.supportBigNumbers && (opts.bigNumberStrings || !Number.isSafeInteger(Number(val)))) {
+    return val.toString();
+  }
+  return Number(val);
+};
+
+const readBigintAsIntBinarySigned = function (packet, opts, throwUnexpectedError, nullBitmap, index) {
+  if (isNullBitmap(index, nullBitmap)) return null;
+  const val = packet.readBigInt64();
+  if (opts.bigIntAsNumber && opts.checkNumberRange && !Number.isSafeInteger(Number(val))) {
+    return throwUnexpectedError(
+      `value ${val} can't safely be converted to number`,
+      false,
+      null,
+      '42000',
+      Errors.ER_PARSING_PRECISION
+    );
+  }
+  if (opts.supportBigNumbers && (opts.bigNumberStrings || !Number.isSafeInteger(Number(val)))) {
+    return val.toString();
+  }
+  return Number(val);
+};
+
+const readGeometryBinary = (defaultVal, packet, opts, throwUnexpectedError, nullBitmap, index) => {
+  if (isNullBitmap(index, nullBitmap)) {
+    return defaultVal;
+  }
+  return packet.readGeometry(defaultVal);
+};
+const readDateBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readBinaryDate(opts);
+const readTimestampBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readBinaryDateTime();
+const readTimestampStringBinary = (scale, packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readBinaryDateTimeAsString(scale);
+const readTimeBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readBinaryTime();
+const readDecimalAsIntBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) => {
+  //checkNumberRange additional check is only done when
+  // resulting value is an integer
+  if (isNullBitmap(index, nullBitmap)) return null;
+  const valDec = packet.readDecimalLengthEncoded();
+  if (valDec != null && (opts.decimalAsNumber || opts.supportBigNumbers)) {
+    if (opts.decimalAsNumber && opts.checkNumberRange && !Number.isSafeInteger(Number(valDec))) {
+      return throwUnexpectedError(
+        `value ${valDec} can't safely be converted to number`,
+        false,
+        null,
+        '42000',
+        Errors.ER_PARSING_PRECISION
+      );
+    }
+    if (opts.supportBigNumbers && (opts.bigNumberStrings || !Number.isSafeInteger(Number(valDec)))) {
+      return valDec;
+    }
+    return Number(valDec);
+  }
+  return valDec;
+};
+const readDecimalBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) => {
+  if (isNullBitmap(index, nullBitmap)) return null;
+  const valDec = packet.readDecimalLengthEncoded();
+  if (valDec != null && (opts.decimalAsNumber || opts.supportBigNumbers)) {
+    const numberValue = Number(valDec);
+    if (
+      opts.supportBigNumbers &&
+      (opts.bigNumberStrings || (Number.isInteger(numberValue) && !Number.isSafeInteger(numberValue)))
+    ) {
+      return valDec;
+    }
+    return numberValue;
+  }
+  return valDec;
+};
+const readJsonBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : JSON.parse(packet.readStringLengthEncoded());
+const readBitBinaryBoolean = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readBufferLengthEncoded()[0] === 1;
+const readBinaryBuffer = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readBufferLengthEncoded();
+const readBinarySet = (packet, opts, throwUnexpectedError, nullBitmap, index) => {
+  if (isNullBitmap(index, nullBitmap)) return null;
+  const string = packet.readStringLengthEncoded();
+  return string == null ? null : string === '' ? [] : string.split(',');
+};
+const readStringBinary = (packet, opts, throwUnexpectedError, nullBitmap, index) =>
+  isNullBitmap(index, nullBitmap) ? null : packet.readStringLengthEncoded();
+
+const DEFAULT_SIGNED_PARSER_TYPE = Array(256);
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.TINY] = readTinyBinarySigned;
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.YEAR] = readShortBinarySigned;
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.SHORT] = readShortBinarySigned;
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.INT24] = readMediumBinarySigned;
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.INT] = readIntBinarySigned;
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.FLOAT] = readFloatBinary;
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.DOUBLE] = readDoubleBinary;
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.DATE] = readDateBinary;
+DEFAULT_SIGNED_PARSER_TYPE[FieldType.TIME] = readTimeBinary;
+
+const DEFAULT_UNSIGNED_PARSER_TYPE = Array(256);
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.TINY] = readTinyBinaryUnsigned;
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.YEAR] = readShortBinaryUnsigned;
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.SHORT] = readShortBinaryUnsigned;
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.INT24] = readMediumBinaryUnsigned;
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.INT] = readIntBinaryUnsigned;
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.FLOAT] = readFloatBinary;
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.DOUBLE] = readDoubleBinary;
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.DATE] = readDateBinary;
+DEFAULT_UNSIGNED_PARSER_TYPE[FieldType.TIME] = readTimeBinary;

SerpentRace_Backend/node_modules/mariadb/lib/cmd/decoder/text-decoder.js

@@ -0,0 +1,210 @@
+//  SPDX-License-Identifier: LGPL-2.1-or-later
+//  Copyright (c) 2015-2024 MariaDB Corporation Ab
+
+'use strict';
+
+const FieldType = require('../../const/field-type');
+const Errors = require('../../misc/errors');
+
+module.exports.parser = function (col, opts) {
+  // Fast path: For most types, we can directly return the default parser
+  // This avoids the cost of the switch statement for common types
+  const defaultParser = DEFAULT_PARSER_TYPE[col.columnType];
+  if (defaultParser) return defaultParser;
+
+  // Parser depending on column info
+  switch (col.columnType) {
+    case FieldType.DECIMAL:
+    case FieldType.NEWDECIMAL:
+      return col.scale === 0 ? readDecimalAsIntLengthCoded : readDecimalLengthCoded;
+
+    case FieldType.BIGINT:
+      if (opts.bigIntAsNumber || opts.supportBigNumbers) return readBigIntAsNumberLengthCoded;
+      return readBigIntLengthCoded;
+
+    case FieldType.GEOMETRY:
+      const defaultVal = col.__getDefaultGeomVal();
+      return function (packet, opts, throwUnexpectedError) {
+        return packet.readGeometry(defaultVal);
+      };
+
+    case FieldType.BIT:
+      if (col.columnLength === 1 && opts.bitOneIsBoolean) {
+        return readBitAsBoolean;
+      }
+      return readBufferLengthEncoded;
+
+    case FieldType.JSON:
+      return opts.jsonStrings ? readStringLengthEncoded : readJson;
+
+    default:
+      if (col.dataTypeFormat === 'json' && opts.autoJsonMap) {
+        return readJson;
+      }
+      if (col.collation.index === 63) {
+        return readBufferLengthEncoded;
+      }
+      if (col.isSet()) {
+        return readSet;
+      }
+      return readStringLengthEncoded;
+  }
+};
+
+module.exports.castWrapper = function (column, packet, opts, nullBitmap, index) {
+  const p = packet;
+
+  column.string = () => p.readStringLengthEncoded();
+  column.buffer = () => p.readBufferLengthEncoded();
+  column.float = () => p.readFloatLengthCoded();
+  column.tiny = column.short = column.int = () => p.readIntLengthEncoded();
+  column.long = () => p.readBigIntLengthEncoded();
+  column.decimal = () => p.readDecimalLengthEncoded();
+  column.date = () => p.readDate(opts);
+  column.datetime = () => p.readDateTime();
+
+  // Only define geometry method if needed (likely less common)
+  // Inline the geometry switch case for better performance
+  column.geometry = () => {
+    let defaultVal = null;
+
+    if (column.dataTypeName) {
+      // Use object lookup instead of switch for better performance
+      const geoTypes = {
+        point: { type: 'Point' },
+        linestring: { type: 'LineString' },
+        polygon: { type: 'Polygon' },
+        multipoint: { type: 'MultiPoint' },
+        multilinestring: { type: 'MultiLineString' },
+        multipolygon: { type: 'MultiPolygon' }
+      };
+
+      defaultVal = geoTypes[column.dataTypeName] || { type: column.dataTypeName };
+    }
+
+    return p.readGeometry(defaultVal);
+  };
+};
+
+const readIntLengthEncoded = (packet, opts, throwUnexpectedError) => packet.readIntLengthEncoded();
+const readStringLengthEncoded = (packet, opts, throwUnexpectedError) => packet.readStringLengthEncoded();
+const readFloatLengthCoded = (packet, opts, throwUnexpectedError) => packet.readFloatLengthCoded();
+const readBigIntLengthCoded = (packet, opts, throwUnexpectedError) => packet.readBigIntLengthEncoded();
+const readAsciiStringLengthEncoded = (packet, opts, throwUnexpectedError) => packet.readAsciiStringLengthEncoded();
+const readBitAsBoolean = (packet, opts, throwUnexpectedError) => {
+  const val = packet.readBufferLengthEncoded();
+  return val == null ? null : val[0] === 1;
+};
+const readBufferLengthEncoded = (packet, opts, throwUnexpectedError) => packet.readBufferLengthEncoded();
+
+const readJson = (packet, opts, throwUnexpectedError) => {
+  const jsonStr = packet.readStringLengthEncoded();
+  return jsonStr === null ? null : JSON.parse(jsonStr);
+};
+
+const readSet = (packet, opts, throwUnexpectedError) => {
+  const string = packet.readStringLengthEncoded();
+  return string == null ? null : string === '' ? [] : string.split(',');
+};
+
+const readDate = (packet, opts, throwUnexpectedError) =>
+  opts.dateStrings ? packet.readAsciiStringLengthEncoded() : packet.readDate();
+
+const readTimestamp = (packet, opts, throwUnexpectedError) =>
+  opts.dateStrings ? packet.readAsciiStringLengthEncoded() : packet.readDateTime();
+
+// Initialize the DEFAULT_PARSER_TYPE array with frequently used types
+// Use a typed array for performance when accessing elements
+const DEFAULT_PARSER_TYPE = new Array(256);
+DEFAULT_PARSER_TYPE[FieldType.TINY] = readIntLengthEncoded;
+DEFAULT_PARSER_TYPE[FieldType.SHORT] = readIntLengthEncoded;
+DEFAULT_PARSER_TYPE[FieldType.INT] = readIntLengthEncoded;
+DEFAULT_PARSER_TYPE[FieldType.INT24] = readIntLengthEncoded;
+DEFAULT_PARSER_TYPE[FieldType.YEAR] = readIntLengthEncoded;
+DEFAULT_PARSER_TYPE[FieldType.FLOAT] = readFloatLengthCoded;
+DEFAULT_PARSER_TYPE[FieldType.DOUBLE] = readFloatLengthCoded;
+DEFAULT_PARSER_TYPE[FieldType.DATE] = readDate;
+DEFAULT_PARSER_TYPE[FieldType.DATETIME] = readTimestamp;
+DEFAULT_PARSER_TYPE[FieldType.TIMESTAMP] = readTimestamp;
+DEFAULT_PARSER_TYPE[FieldType.TIME] = readAsciiStringLengthEncoded;
+
+const readBigIntAsNumberLengthCoded = (packet, opts, throwUnexpectedError) => {
+  const len = packet.readUnsignedLength();
+  if (len === null) return null;
+
+  // Fast path for small integers
+  if (len < 16) {
+    const val = packet._atoi(len);
+    // We know we're here because either bigIntAsNumber or supportBigNumbers is true
+    if (opts.supportBigNumbers && opts.bigNumberStrings) {
+      return `${val}`;
+    }
+    return val;
+  }
+
+  const val = packet.readBigIntFromLen(len);
+  if (opts.bigIntAsNumber && opts.checkNumberRange && !Number.isSafeInteger(Number(val))) {
+    return throwUnexpectedError(
+      `value ${val} can't safely be converted to number`,
+      false,
+      null,
+      '42000',
+      Errors.ER_PARSING_PRECISION
+    );
+  }
+  const numVal = Number(val);
+  if (opts.supportBigNumbers && (opts.bigNumberStrings || !Number.isSafeInteger(numVal))) {
+    return val.toString();
+  }
+
+  return numVal;
+};
+
+const readDecimalAsIntLengthCoded = (packet, opts, throwUnexpectedError) => {
+  const valDec = packet.readDecimalLengthEncoded();
+  if (valDec === null) return null;
+
+  // Only perform conversions if needed based on options
+  if (!(opts.decimalAsNumber || opts.supportBigNumbers)) return valDec;
+
+  // Convert once
+  const numValue = Number(valDec);
+
+  // Check number range if required
+  if (opts.decimalAsNumber && opts.checkNumberRange && !Number.isSafeInteger(numValue)) {
+    return throwUnexpectedError(
+      `value ${valDec} can't safely be converted to number`,
+      false,
+      null,
+      '42000',
+      Errors.ER_PARSING_PRECISION
+    );
+  }
+
+  // Return string representation for big numbers if needed
+  if (opts.supportBigNumbers && (opts.bigNumberStrings || !Number.isSafeInteger(numValue))) {
+    return valDec;
+  }
+
+  return numValue;
+};
+
+const readDecimalLengthCoded = (packet, opts, throwUnexpectedError) => {
+  const valDec = packet.readDecimalLengthEncoded();
+  if (valDec === null) return null;
+
+  // Only perform conversions if needed based on options
+  if (!(opts.decimalAsNumber || opts.supportBigNumbers)) return valDec;
+
+  const numberValue = Number(valDec);
+
+  // Handle big numbers specifically
+  if (
+    opts.supportBigNumbers &&
+    (opts.bigNumberStrings || (Number.isInteger(numberValue) && !Number.isSafeInteger(numberValue)))
+  ) {
+    return valDec;
+  }
+
+  return numberValue;
+};