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PostgreSQL JDBC - NG - Driver
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/**
* Copyright (c) 2013, impossibl.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of impossibl.com nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.impossibl.postgres.system.procs;
import com.impossibl.postgres.jdbc.PGBlob;
import com.impossibl.postgres.jdbc.PGBufferBlob;
import com.impossibl.postgres.system.Context;
import com.impossibl.postgres.system.ConversionException;
import com.impossibl.postgres.types.Type;
import com.impossibl.postgres.utils.guava.ByteStreams;
import static com.impossibl.postgres.system.SystemSettings.FIELD_LENGTH_MAX;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.SQLException;
import static java.lang.Math.min;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufInputStream;
import io.netty.buffer.Unpooled;
public class Bytes extends SimpleProcProvider {
public Bytes() {
super(new TxtEncoder(), new TxtDecoder(), new BinEncoder(), new BinDecoder(), "bytea");
}
private static byte[] coerceInput(Type type, Object source, Long length) throws IOException {
if (source instanceof byte[]) {
return (byte[]) source;
}
if (source instanceof InputStream) {
InputStream is = (InputStream) source;
if (length != null) {
is = ByteStreams.limit(is, length);
}
return ByteStreams.toByteArray(is);
}
if (source instanceof PGBlob) {
PGBlob blob = (PGBlob) source;
try (InputStream in = blob.getBinaryStream()) {
return ByteStreams.toByteArray(in);
}
catch (SQLException e) {
throw new IOException("Error loading blob data", e);
}
}
throw new ConversionException(source.getClass(), type);
}
private static Object convertOutput(Context context, Type type, ByteBuf decoded, Class targetClass) throws ConversionException {
if (targetClass == InputStream.class) {
return new ByteBufInputStream(decoded, true);
}
if (targetClass == byte[].class) {
byte[] bytes = new byte[decoded.readableBytes()];
decoded.readBytes(bytes);
decoded.release();
return bytes;
}
if (targetClass == String.class) {
byte[] bytes = new byte[decoded.readableBytes()];
decoded.readBytes(bytes);
decoded.release();
return new String(bytes, context.getCharset());
}
if (targetClass == Blob.class) {
return new PGBufferBlob(decoded.retainedDuplicate());
}
throw new ConversionException(type, targetClass);
}
static class BinDecoder extends BaseBinaryDecoder {
BinDecoder() {
enableRespectMaxLength();
}
@Override
public Class getDefaultClass() {
return InputStream.class;
}
@Override
protected Object decodeValue(Context context, Type type, Short typeLength, Integer typeModifier, ByteBuf buffer, Class targetClass, Object targetContext) throws IOException {
int length = buffer.readableBytes();
int readLength;
Integer maxLength = context.getSetting(FIELD_LENGTH_MAX);
if (maxLength != null) {
readLength = min(maxLength, length);
}
else {
readLength = length;
}
ByteBuf bytes = buffer.readRetainedSlice(readLength);
try {
buffer.skipBytes(length - readLength);
return convertOutput(context, type, bytes, targetClass);
}
catch (Throwable t) {
bytes.release();
throw t;
}
}
}
static class BinEncoder extends BaseBinaryEncoder {
@Override
protected void encodeValue(Context context, Type type, Object val, Object sourceContext, ByteBuf buffer) throws IOException {
Long specifiedLength = (Long) sourceContext;
byte[] value = Bytes.coerceInput(type, val, specifiedLength);
if (specifiedLength != null && specifiedLength != value.length) {
throw new IOException("Invalid binary length");
}
buffer.writeBytes(value);
}
}
static class TxtDecoder extends BaseTextDecoder {
TxtDecoder() {
enableRespectMaxLength();
}
@Override
public Class getDefaultClass() {
return InputStream.class;
}
@Override
protected Object decodeValue(Context context, Type type, Short typeLength, Integer typeModifier, CharSequence buffer, Class targetClass, Object targetContext) throws IOException {
ByteBuf bytes;
if (buffer.length() > 2 && buffer.charAt(0) == '\\' && buffer.charAt(1) == 'x') {
bytes = Unpooled.wrappedBuffer(decodeHex(buffer.subSequence(2, buffer.length())));
}
else {
bytes = decodeEscape(buffer);
}
try {
return convertOutput(context, type, bytes, targetClass);
}
catch (Throwable t) {
bytes.release();
throw t;
}
}
ByteBuf decodeEscape(CharSequence buffer) {
int length = buffer.length();
ByteBuf data = Unpooled.buffer(length);
try {
for (int i = 0; i < length; ++i) {
char ch = buffer.charAt(i);
if (ch == '\\') {
char ch1 = buffer.charAt(++i);
if (ch1 == '\\') {
data.writeByte((byte) '\\');
}
if (i == length - 1) break;
char ch2 = buffer.charAt(++i);
char ch3 = buffer.charAt(++i);
data.writeByte((byte) (ch1 * 64 + ch2 * 8 + ch3));
}
data.writeByte((byte) ch);
}
return data.capacity(data.writerIndex());
}
catch (Throwable t) {
data.release();
throw t;
}
}
}
static class TxtEncoder extends BaseTextEncoder {
@Override
protected void encodeValue(Context context, Type type, Object val, Object sourceContext, StringBuilder buffer) throws IOException {
Long specifiedLength = (Long) sourceContext;
byte[] value = coerceInput(type, val, specifiedLength);
if (specifiedLength != null && specifiedLength != value.length) {
throw new IOException("Mismatch in length of binary arguments");
}
buffer.append("\\x");
encodeHex(value, buffer);
}
}
private static final char[] HEX_CHARS = "0123456789ABCDEF".toCharArray();
public static byte[] decodeHex(CharSequence buffer) throws ConversionException {
return decodeHex(buffer, false);
}
public static byte[] decodeHex(CharSequence buffer, boolean ignoreDelimeters) throws ConversionException {
// count non hex chars
int hexChars = 0;
for (int i = 0; i < buffer.length(); i++) {
char ch = buffer.charAt(i);
switch (ch) {
case '-':
case '_':
case ':':
case '.':
case ',':
continue;
default:
if ((ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F') || (ch >= '0' && ch <= '9'))
hexChars++;
else if (!ignoreDelimeters)
throw new ConversionException("Invalid hex input");
}
}
if (hexChars % 2 != 0) {
throw new ConversionException("Invalid hex input");
}
int length = buffer.length();
byte[] data = new byte[hexChars / 2];
for (int i = 0, j = 0; i < length; i += 2, j += 1) {
char ch = buffer.charAt(i);
switch (ch) {
case '-':
case '_':
case ':':
case '.':
case ',':
i += 1;
ch = buffer.charAt(i);
default:
char ch2 = buffer.charAt(i + 1);
data[j] = (byte) (((Character.digit(ch, 16) << 4) + Character.digit(ch2, 16)));
}
}
return data;
}
public static String encodeHex(byte[] value) {
StringBuilder out = new StringBuilder();
encodeHex(value, out);
return out.toString();
}
public static void encodeHex(byte[] value, StringBuilder buffer) {
buffer.ensureCapacity(buffer.capacity() + value.length * 2);
for (byte b : value) {
buffer.append(HEX_CHARS[(b >>> 4) & 0x0F]).append(HEX_CHARS[b & 0x0F]);
}
}
}