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/*
* Copyright (c) 2016, 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.a;
import com.mysql.cj.Messages;
import com.mysql.cj.MysqlType;
import com.mysql.cj.conf.PropertyKey;
import com.mysql.cj.exceptions.ExceptionFactory;
import com.mysql.cj.protocol.ColumnDefinition;
import com.mysql.cj.protocol.ProtocolEntityFactory;
import com.mysql.cj.protocol.Resultset;
import com.mysql.cj.protocol.Resultset.Concurrency;
import com.mysql.cj.protocol.ResultsetRow;
import com.mysql.cj.protocol.a.NativeConstants.StringLengthDataType;
import com.mysql.cj.protocol.a.NativeConstants.StringSelfDataType;
import com.mysql.cj.protocol.a.result.BinaryBufferRow;
import com.mysql.cj.protocol.a.result.ByteArrayRow;
import com.mysql.cj.result.Field;
/**
* Handle binary-encoded data for server-side PreparedStatements
*
*/
public class BinaryRowFactory extends AbstractRowFactory implements ProtocolEntityFactory {
public BinaryRowFactory(NativeProtocol protocol, ColumnDefinition columnDefinition, Resultset.Concurrency resultSetConcurrency,
boolean canReuseRowPacketForBufferRow) {
this.columnDefinition = columnDefinition;
this.resultSetConcurrency = resultSetConcurrency;
this.canReuseRowPacketForBufferRow = canReuseRowPacketForBufferRow;
this.useBufferRowSizeThreshold = protocol.getPropertySet().getMemorySizeProperty(PropertyKey.largeRowSizeThreshold);
this.exceptionInterceptor = protocol.getExceptionInterceptor();
this.valueDecoder = new MysqlBinaryValueDecoder();
}
@Override
public ResultsetRow createFromMessage(NativePacketPayload rowPacket) {
// use a buffer row for reusable packets (streaming results), blobs and long strings
// or if we're over the threshold
boolean useBufferRow = this.canReuseRowPacketForBufferRow || this.columnDefinition.hasLargeFields()
|| rowPacket.getPayloadLength() >= this.useBufferRowSizeThreshold.getValue();
// bump past ProtocolBinary::ResultsetRow packet header
rowPacket.setPosition(rowPacket.getPosition() + 1);
if (this.resultSetConcurrency == Concurrency.UPDATABLE || !useBufferRow) {
return unpackBinaryResultSetRow(this.columnDefinition.getFields(), rowPacket);
}
return new BinaryBufferRow(rowPacket, this.columnDefinition, this.exceptionInterceptor, this.valueDecoder);
}
@Override
public boolean canReuseRowPacketForBufferRow() {
return this.canReuseRowPacketForBufferRow;
}
/**
* Un-packs binary-encoded result set data for one row
*
* @param fields
* {@link Field}s array
* @param binaryData
* data
*
* @return byte[][]
*/
private final ResultsetRow unpackBinaryResultSetRow(Field[] fields, NativePacketPayload binaryData) {
int numFields = fields.length;
byte[][] unpackedRowBytes = new byte[numFields][];
//
// Unpack the null bitmask, first
//
int nullCount = (numFields + 9) / 8;
int nullMaskPos = binaryData.getPosition();
binaryData.setPosition(nullMaskPos + nullCount);
int bit = 4; // first two bits are reserved for future use
byte[] buf = binaryData.getByteBuffer();
for (int i = 0; i < numFields; i++) {
if ((buf[nullMaskPos] & bit) != 0) {
unpackedRowBytes[i] = null;
} else {
extractNativeEncodedColumn(binaryData, fields, i, unpackedRowBytes);
}
if (((bit <<= 1) & 255) == 0) {
bit = 1; /* To next byte */
nullMaskPos++;
}
}
return new ByteArrayRow(unpackedRowBytes, this.exceptionInterceptor, new MysqlBinaryValueDecoder());
}
/**
* Copy the raw result bytes from the
*
* @param binaryData
* packet to the
* @param fields
* {@link Field}s array
* @param columnIndex
* column index
* @param unpackedRowData
* byte array.
*/
private final void extractNativeEncodedColumn(NativePacketPayload binaryData, Field[] fields, int columnIndex, byte[][] unpackedRowData) {
int type = fields[columnIndex].getMysqlTypeId();
int len = NativeUtils.getBinaryEncodedLength(type);
if (type == MysqlType.FIELD_TYPE_NULL) {
// Do nothing
} else if (len == 0) {
unpackedRowData[columnIndex] = binaryData.readBytes(StringSelfDataType.STRING_LENENC);
} else if (len > 0) {
unpackedRowData[columnIndex] = binaryData.readBytes(StringLengthDataType.STRING_FIXED, len);
} else {
throw ExceptionFactory.createException(Messages.getString("MysqlIO.97", new Object[] { type, columnIndex, fields.length }));
}
}
}
