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/*
* SonarQube Python Plugin
* Copyright (C) 2011-2024 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.python.caching;
import java.io.Closeable;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import javax.annotation.Nullable;
/**
* Use variable length encoding for integers.
* https://en.wikipedia.org/wiki/Variable-length_code
*/
public class VarLengthOutputStream implements Closeable {
private final DataOutputStream out;
public VarLengthOutputStream(OutputStream out) {
this.out = new DataOutputStream(out);
}
public void writeInt(int value) throws IOException {
do {
// encode the next 7 bits + "next byte" bit
int bits = value & 0x7F;
// remove 7 bits from value
value >>>= 7;
// add "next byte" bit if another byte is required
byte b = (byte) (bits + ((value != 0) ? 0x80 : 0));
out.write(b);
} while (value != 0);
}
public void writeUTF(@Nullable String string) throws IOException {
byte[] bytes;
if (string == null) {
bytes = "".getBytes(StandardCharsets.UTF_8);
} else {
bytes = string.getBytes(StandardCharsets.UTF_8);
}
writeInt(bytes.length);
out.write(bytes);
}
@Override
public void close() throws IOException {
out.close();
}
}
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