/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.code.or.common.util;
import java.math.BigDecimal;
import java.util.Calendar;
/**
*
* @author Jingqi Xu
* @see tungsten replicator
*/
public final class MySQLUtils {
//
private static final int DIGITS_PER_4BYTES = 9;
private static final BigDecimal POSITIVE_ONE = BigDecimal.ONE;
private static final BigDecimal NEGATIVE_ONE = new BigDecimal("-1");
private static final int DECIMAL_BINARY_SIZE[] = {0, 1, 1, 2, 2, 3, 3, 4, 4, 4};
/**
*
*/
public static byte[] password41OrLater(byte password[], byte scramble[]) {
final byte[] stage1 = CodecUtils.sha(password);
final byte[] stage2 = CodecUtils.sha(CodecUtils.concat(scramble, CodecUtils.sha(stage1)));
return CodecUtils.xor(stage1, stage2);
}
/**
*
*/
public static int toYear(int value) {
return 1900 + value;
}
public static java.sql.Date toDate(int value) {
final int d = value % 32; value >>>= 5;
final int m = value % 16;
final int y = value >> 4;
final Calendar cal = Calendar.getInstance();
cal.clear();
cal.set(y, m - 1, d);
return new java.sql.Date(cal.getTimeInMillis());
}
public static java.sql.Time toTime(int value) {
final int s = (int)(value % 100); value /= 100;
final int m = (int)(value % 100);
final int h = (int)(value / 100);
final Calendar c = Calendar.getInstance();
c.set(70, 0, 1, h, m, s);
return new java.sql.Time(c.getTimeInMillis());
}
public static java.util.Date toDatetime(long value) {
final int sec = (int)(value % 100); value /= 100;
final int min = (int)(value % 100); value /= 100;
final int hour = (int)(value % 100); value /= 100;
final int day = (int)(value % 100); value /= 100;
final int mon = (int)(value % 100);
final int year = (int)(value / 100);
final Calendar c = Calendar.getInstance();
c.set(year, mon - 1, day, hour, min, sec);
return c.getTime();
}
public static java.sql.Timestamp toTimestamp(long value) {
return new java.sql.Timestamp(value * 1000L);
}
public static BigDecimal toDecimal(int precision, int scale, byte[] value) {
//
final boolean positive = (value[0] & 0x80) == 0x80;
value[0] ^= 0x80;
if (!positive) {
for (int i = 0; i < value.length; i++) {
value[i] ^= 0xFF;
}
}
//
final int x = precision - scale;
final int ipDigits = x / DIGITS_PER_4BYTES;
final int ipDigitsX = x - ipDigits * DIGITS_PER_4BYTES;
final int ipSize = (ipDigits << 2) + DECIMAL_BINARY_SIZE[ipDigitsX];
int offset = DECIMAL_BINARY_SIZE[ipDigitsX];
BigDecimal ip = offset > 0 ? BigDecimal.valueOf(CodecUtils.toInt(value, 0, offset)) : BigDecimal.ZERO;
for(; offset < ipSize; offset += 4) {
final int i = CodecUtils.toInt(value, offset, 4);
ip = ip.movePointRight(DIGITS_PER_4BYTES).add(BigDecimal.valueOf(i));
}
//
int shift = 0;
BigDecimal fp = BigDecimal.ZERO;
for (; shift + DIGITS_PER_4BYTES <= scale; shift += DIGITS_PER_4BYTES, offset += 4) {
final int i = CodecUtils.toInt(value, offset, 4);
fp = fp.add(BigDecimal.valueOf(i).movePointLeft(shift + DIGITS_PER_4BYTES));
}
if(shift < scale) {
final int i = CodecUtils.toInt(value, offset, DECIMAL_BINARY_SIZE[scale - shift]);
fp = fp.add(BigDecimal.valueOf(i).movePointLeft(scale));
}
//
return positive ? POSITIVE_ONE.multiply(ip.add(fp)) : NEGATIVE_ONE.multiply(ip.add(fp));
}
/**
*
*/
public static int getDecimalBinarySize(int precision, int scale) {
final int x = precision - scale;
final int ipDigits = x / DIGITS_PER_4BYTES;
final int fpDigits = scale / DIGITS_PER_4BYTES;
final int ipDigitsX = x - ipDigits * DIGITS_PER_4BYTES;
final int fpDigitsX = scale - fpDigits * DIGITS_PER_4BYTES;
return (ipDigits << 2) + DECIMAL_BINARY_SIZE[ipDigitsX] + (fpDigits << 2) + DECIMAL_BINARY_SIZE[fpDigitsX];
}
}