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/*
* Copyright (c) 2015, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.protocol.x;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import com.google.protobuf.CodedInputStream;
import com.mysql.cj.exceptions.AssertionFailedException;
import com.mysql.cj.exceptions.DataReadException;
import com.mysql.cj.protocol.InternalDate;
import com.mysql.cj.protocol.InternalTime;
import com.mysql.cj.protocol.InternalTimestamp;
import com.mysql.cj.protocol.ValueDecoder;
import com.mysql.cj.result.Field;
import com.mysql.cj.result.ValueFactory;
public class XProtocolDecoder implements ValueDecoder {
public static XProtocolDecoder instance = new XProtocolDecoder();
@Override
public T decodeDate(byte[] bytes, int offset, int length, ValueFactory vf) {
return decodeTimestamp(bytes, offset, length, 0, vf);
}
@Override
public T decodeTime(byte[] bytes, int offset, int length, int scale, ValueFactory vf) {
try {
CodedInputStream inputStream = CodedInputStream.newInstance(bytes, offset, length);
boolean negative = inputStream.readRawByte() > 0;
int hours = 0;
int minutes = 0;
int seconds = 0;
int nanos = 0;
if (!inputStream.isAtEnd()) {
hours = (int) inputStream.readInt64();
if (!inputStream.isAtEnd()) {
minutes = (int) inputStream.readInt64();
if (!inputStream.isAtEnd()) {
seconds = (int) inputStream.readInt64();
if (!inputStream.isAtEnd()) {
nanos = 1000 * (int) inputStream.readInt64();
}
}
}
}
return vf.createFromTime(new InternalTime(negative ? -1 * hours : hours, minutes, seconds, nanos, scale));
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeTimestamp(byte[] bytes, int offset, int length, int scale, ValueFactory vf) {
try {
CodedInputStream inputStream = CodedInputStream.newInstance(bytes, offset, length);
int year = (int) inputStream.readUInt64();
int month = (int) inputStream.readUInt64();
int day = (int) inputStream.readUInt64();
// do we have a time too?
if (inputStream.getBytesUntilLimit() > 0) {
int hours = 0;
int minutes = 0;
int seconds = 0;
int nanos = 0;
if (!inputStream.isAtEnd()) {
hours = (int) inputStream.readInt64();
if (!inputStream.isAtEnd()) {
minutes = (int) inputStream.readInt64();
if (!inputStream.isAtEnd()) {
seconds = (int) inputStream.readInt64();
if (!inputStream.isAtEnd()) {
nanos = 1000 * (int) inputStream.readInt64();
}
}
}
}
return vf.createFromTimestamp(new InternalTimestamp(year, month, day, hours, minutes, seconds, nanos, scale));
}
return vf.createFromDate(new InternalDate(year, month, day));
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeInt1(byte[] bytes, int offset, int length, ValueFactory vf) {
// TODO Auto-generated method stub
return null;
}
@Override
public T decodeUInt1(byte[] bytes, int offset, int length, ValueFactory vf) {
// TODO Auto-generated method stub
return null;
}
@Override
public T decodeInt2(byte[] bytes, int offset, int length, ValueFactory vf) {
// TODO Auto-generated method stub
return null;
}
@Override
public T decodeUInt2(byte[] bytes, int offset, int length, ValueFactory vf) {
// TODO Auto-generated method stub
return null;
}
@Override
public T decodeInt4(byte[] bytes, int offset, int length, ValueFactory vf) {
// TODO Auto-generated method stub
return null;
}
@Override
public T decodeUInt4(byte[] bytes, int offset, int length, ValueFactory vf) {
// TODO Auto-generated method stub
return null;
}
@Override
public T decodeInt8(byte[] bytes, int offset, int length, ValueFactory vf) {
try {
return vf.createFromLong(CodedInputStream.newInstance(bytes, offset, length).readSInt64());
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeUInt8(byte[] bytes, int offset, int length, ValueFactory vf) {
try {
// protobuf stores an unsigned 64bit int into a java long with the highest bit as the sign, we re-interpret it using ByteBuffer (with a prepended
// 0-byte to avoid negative)
BigInteger v = new BigInteger(
ByteBuffer.allocate(9).put((byte) 0).putLong(CodedInputStream.newInstance(bytes, offset, length).readUInt64()).array());
return vf.createFromBigInteger(v);
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeFloat(byte[] bytes, int offset, int length, ValueFactory vf) {
try {
return vf.createFromDouble(CodedInputStream.newInstance(bytes, offset, length).readFloat());
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeDouble(byte[] bytes, int offset, int length, ValueFactory vf) {
try {
return vf.createFromDouble(CodedInputStream.newInstance(bytes, offset, length).readDouble());
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeDecimal(byte[] bytes, int offset, int length, ValueFactory vf) {
try {
CodedInputStream inputStream = CodedInputStream.newInstance(bytes, offset, length);
// packed BCD format (c.f. wikipedia)
// TODO: optimization possibilities include using int/long if the digits is < X and scale = 0
byte scale = inputStream.readRawByte();
// we allocate an extra char for the sign
CharBuffer unscaledString = CharBuffer.allocate(2 * inputStream.getBytesUntilLimit());
unscaledString.position(1);
byte sign = 0;
// read until we encounter the sign bit
while (true) {
int b = 0xFF & inputStream.readRawByte();
if ((b >> 4) > 9) {
sign = (byte) (b >> 4);
break;
}
unscaledString.append((char) ((b >> 4) + '0'));
if ((b & 0x0f) > 9) {
sign = (byte) (b & 0x0f);
break;
}
unscaledString.append((char) ((b & 0x0f) + '0'));
}
if (inputStream.getBytesUntilLimit() > 0) {
throw AssertionFailedException
.shouldNotHappen("Did not read all bytes while decoding decimal. Bytes left: " + inputStream.getBytesUntilLimit());
}
switch (sign) {
case 0xa:
case 0xc:
case 0xe:
case 0xf:
unscaledString.put(0, '+');
break;
case 0xb:
case 0xd:
unscaledString.put(0, '-');
break;
}
// may have filled the CharBuffer or one remaining. need to remove it before toString()
int characters = unscaledString.position();
unscaledString.clear(); // reset position
BigInteger unscaled = new BigInteger(unscaledString.subSequence(0, characters).toString());
return vf.createFromBigDecimal(new BigDecimal(unscaled, scale));
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeByteArray(byte[] bytes, int offset, int length, Field f, ValueFactory vf) {
try {
CodedInputStream inputStream = CodedInputStream.newInstance(bytes, offset, length);
// c.f. Streaming_command_delegate::get_string()
int size = inputStream.getBytesUntilLimit();
size--; // for null terminator
return vf.createFromBytes(inputStream.readRawBytes(size), 0, size, f);
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeBit(byte[] bytes, int offset, int length, ValueFactory vf) {
try {
// protobuf stores an unsigned 64bit int into a java long with the highest bit as the sign, we re-interpret it using ByteBuffer (with a prepended
// 0-byte to avoid negative)
byte[] buf = ByteBuffer.allocate(Long.BYTES + 1).put((byte) 0).putLong(CodedInputStream.newInstance(bytes, offset, length).readUInt64()).array();
return vf.createFromBit(buf, 0, Long.BYTES + 1);
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeSet(byte[] bytes, int offset, int length, Field f, ValueFactory vf) {
try {
CodedInputStream inputStream = CodedInputStream.newInstance(bytes, offset, length);
StringBuilder vals = new StringBuilder();
while (inputStream.getBytesUntilLimit() > 0) {
if (vals.length() > 0) {
vals.append(",");
}
long valLen = inputStream.readUInt64();
// TODO: charset
vals.append(new String(inputStream.readRawBytes((int) valLen)));
}
// TODO: charset mess here
byte[] buf = vals.toString().getBytes();
return vf.createFromBytes(buf, 0, buf.length, f);
} catch (IOException e) {
throw new DataReadException(e);
}
}
@Override
public T decodeYear(byte[] bytes, int offset, int length, ValueFactory vf) {
// TODO Auto-generated method stub
return null;
}
}
