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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.system.Context;
import com.impossibl.postgres.types.PrimitiveType;
import com.impossibl.postgres.types.Type;
import com.impossibl.postgres.utils.guava.ByteStreams;
import static com.impossibl.postgres.system.Settings.FIELD_VARYING_LENGTH_MAX;
import static com.impossibl.postgres.types.PrimitiveType.Binary;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import static java.lang.Math.min;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferInputStream;
import org.jboss.netty.buffer.ChannelBufferOutputStream;
public class Bytes extends SimpleProcProvider {
public static final BinDecoder BINARY_DECODER = new BinDecoder();
public static final BinEncoder BINARY_ENCODER = new BinEncoder();
public Bytes() {
super(new TxtEncoder(), new TxtDecoder(), new BinEncoder(), new BinDecoder(), "bytea");
}
static class BinDecoder extends BinaryDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return Binary;
}
@Override
public Class getOutputType() {
return InputStream.class;
}
@Override
public InputStream decode(Type type, Short typeLength, Integer typeModifier, ChannelBuffer buffer, Context context) throws IOException {
int length = buffer.readInt();
if (length == -1) {
return null;
}
int readLength;
Integer maxLength = (Integer) context.getSetting(FIELD_VARYING_LENGTH_MAX);
if (maxLength != null) {
readLength = min(maxLength, length);
}
else {
readLength = length;
}
ChannelBuffer data = buffer.readBytes(readLength);
buffer.skipBytes(length - readLength);
return new ChannelBufferInputStream(data);
}
}
static class BinEncoder extends BinaryEncoder {
@Override
public Class getInputType() {
return InputStream.class;
}
@Override
public PrimitiveType getOutputPrimitiveType() {
return Binary;
}
@Override
public void encode(Type type, ChannelBuffer buffer, Object val, Context context) throws IOException {
if (val == null) {
buffer.writeInt(-1);
}
else {
InputStream in = (InputStream) val;
int totalLength;
// Do we know, for sure, how long the stream is?
if (in instanceof ByteStreams.LimitedInputStream) {
totalLength = (int) ((ByteStreams.LimitedInputStream) in).limit();
}
else if (in instanceof ByteArrayInputStream) {
totalLength = in.available();
}
else {
// We must fallback to reading entire buffer to make sure we
// get all the data from the input stream
byte[] data = ByteStreams.toByteArray(in);
totalLength = data.length;
in = new ByteArrayInputStream(data);
}
buffer.writeInt(totalLength);
// Copy stream to buffer
long totalRead = ByteStreams.copy(in, new ChannelBufferOutputStream(buffer));
if (totalLength != totalRead) {
throw new IOException("invalid stream length");
}
}
}
@Override
public int length(Type type, Object val, Context context) throws IOException {
int length = 4;
if (val != null) {
InputStream in = (InputStream) val;
// Do we know, for sure, how long the stream is?
if (in instanceof ByteStreams.LimitedInputStream) {
length += (int) ((ByteStreams.LimitedInputStream) in).limit();
}
else if (in instanceof ByteArrayInputStream) {
length += in.available();
}
else {
throw new IOException("unable to compute length of InputStream type: " + val.getClass().getName());
}
}
return length;
}
}
static class TxtDecoder extends TextDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return Binary;
}
@Override
public Class getOutputType() {
return InputStream.class;
}
@Override
public InputStream decode(Type type, Short typeLength, Integer typeModifier, CharSequence buffer, Context context) throws IOException {
byte[] data;
if (buffer.length() > 2 && buffer.charAt(0) == '\\' && buffer.charAt(1) == 'x') {
data = decodeHex(buffer.subSequence(2, buffer.length()));
}
else {
data = decodeEscape(buffer);
}
return new ByteArrayInputStream(data);
}
byte[] decodeHex(CharSequence buffer) {
int length = buffer.length();
byte[] data = new byte[length / 2];
for (int i = 0; i < length; i += 2) {
data[i / 2] = (byte) ((Character.digit(buffer.charAt(i), 16) << 4) + Character.digit(buffer.charAt(i + 1), 16));
}
return data;
}
byte[] decodeEscape(CharSequence buffer) {
int length = buffer.length();
byte[] data = new byte[length];
int out = 0;
for (int i = 0; i < length; ++i) {
char ch = buffer.charAt(i);
switch (ch) {
case '\\':
char ch1 = buffer.charAt(++i);
switch (ch1) {
case '\\':
data[++out] = '\\';
default:
char ch2 = buffer.charAt(++i);
char ch3 = buffer.charAt(++i);
data[++out] = (byte) (ch1 * 64 + ch2 * 8 + ch3);
}
default:
data[++out] = (byte) ch;
}
}
return Arrays.copyOf(data, out);
}
}
static class TxtEncoder extends TextEncoder {
@Override
public Class getInputType() {
return InputStream.class;
}
@Override
public PrimitiveType getOutputPrimitiveType() {
return Binary;
}
private static final char[] hexArray = "0123456789ABCDEF".toCharArray();
@Override
public void encode(Type type, StringBuilder buffer, Object val, Context context) throws IOException {
InputStream in = (InputStream) val;
buffer.append("\\x");
int v;
while ((v = in.read()) > -1) {
buffer.append(hexArray[v >>> 4]).append(hexArray[v & 0x0F]);
}
}
}
}
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