io.questdb.std.str.NativeLPSZ Maven / Gradle / Ivy
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*
* Copyright (c) 2014-2019 Appsicle
* Copyright (c) 2019-2020 QuestDB
*
* 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 io.questdb.std.str;
import io.questdb.std.Unsafe;
/**
* Represents C LPSZ as Java' CharSequence. Byes in native memory are interpreted as ASCII characters. Multi-byte
* characters are NOT decoded.
*/
public class NativeLPSZ extends AbstractCharSequence {
private long address;
private int len;
@Override
public int length() {
return len;
}
@Override
public char charAt(int index) {
return (char) Unsafe.getUnsafe().getByte(address + index);
}
@SuppressWarnings("StatementWithEmptyBody")
public NativeLPSZ of(long address) {
this.address = address;
long p = address;
while (Unsafe.getUnsafe().getByte(p++) != 0) ;
this.len = (int) (p - address - 1);
return this;
}
}