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bt.bencoding.BEEncoder Maven / Gradle / Ivy
/*
* Copyright (c) 2016—2017 Andrei Tomashpolskiy and individual contributors.
*
* Licensed 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 bt.bencoding;
import bt.bencoding.model.BEInteger;
import bt.bencoding.model.BEList;
import bt.bencoding.model.BEMap;
import bt.bencoding.model.BEObject;
import bt.bencoding.model.BEString;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigInteger;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;
import java.util.function.BinaryOperator;
import java.util.stream.Collectors;
/**
* BEncoding encoder.
*
* @since 1.0
*/
public class BEEncoder {
private static final Charset defaultCharset = Charset.forName("UTF-8");
private static final BEEncoder instance = new BEEncoder();
/**
* Get default encoder.
*
* @since 1.0
*/
public static BEEncoder encoder() {
return instance;
}
/**
* Write bencoded string to a binary output.
*
* @since 1.0
*/
public void encode(BEString string, OutputStream out) throws IOException {
Objects.requireNonNull(string);
byte[] bytes = string.getValue();
encodeString(bytes, out);
}
private void encodeString(byte[] bytes, OutputStream out) throws IOException {
write(out, Integer.toString(bytes.length).getBytes(defaultCharset));
write(out, ':');
write(out, bytes);
}
/**
* Write bencoded integer to a binary output.
*
* @since 1.0
*/
public void encode(BEInteger integer, OutputStream out) throws IOException {
Objects.requireNonNull(integer);
BigInteger value = integer.getValue();
write(out, BEParser.INTEGER_PREFIX);
write(out, Integer.toString(value.intValueExact()).getBytes(defaultCharset));
write(out, BEParser.EOF);
}
/**
* Write bencoded list to a binary output.
*
* @since 1.0
*/
public void encode(BEList list, OutputStream out) throws IOException {
Objects.requireNonNull(list);
List extends BEObject>> values = list.getValue();
write(out, BEParser.LIST_PREFIX);
for (BEObject> value : values) {
value.writeTo(out);
}
write(out, BEParser.EOF);
}
/**
* Write bencoded dictionary to a binary output.
*
* @since 1.0
*/
public void encode(BEMap map, OutputStream out) throws IOException {
Objects.requireNonNull(map);
write(out, BEParser.MAP_PREFIX);
TreeMap> values = map.getValue().entrySet().stream()
.collect(Collectors.toMap(
e -> e.getKey().getBytes(defaultCharset),
Map.Entry::getValue,
(BinaryOperator>) (u, u2) -> {
throw new IllegalStateException();
},
() -> new TreeMap<>(ByteStringComparator.comparator())));
for (Map.Entry> e : values.entrySet()) {
encodeString(e.getKey(), out);
e.getValue().writeTo(out);
}
write(out, BEParser.EOF);
}
private void write(OutputStream out, int i) throws IOException {
out.write(i);
}
private void write(OutputStream out, byte[] bytes) throws IOException {
out.write(bytes);
}
}
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