com.atlassian.clover.registry.format.BufferUtils Maven / Gradle / Ivy

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Clover's runtime library - required by code instrumented by Clover. Clover is an award-winning code coverage and testing tool for Java and Groovy. It integrates easily with Maven, Ant, Grails, Eclipse and IntelliJ IDEA as well as with continuous integration servers such as Bamboo, Jenkins or Hudson.

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package com.atlassian.clover.registry.format;

import java.nio.channels.FileChannel;
import java.nio.ByteBuffer;
import java.nio.BufferUnderflowException;
import java.io.IOException;
import java.util.zip.Adler32;

/** General ByteBuffer utility methods */
class BufferUtils {
    static void writeFully(FileChannel channel, ByteBuffer fileInfosBuffer) throws IOException {
        while (fileInfosBuffer.hasRemaining()) {
            channel.write(fileInfosBuffer);
        }
    }

    static ByteBuffer readFully(FileChannel channel, ByteBuffer buffer) throws IOException {
        int read = 0;
        while (buffer.hasRemaining() && read != -1) {
            read = channel.read(buffer);
        }
        if (buffer.hasRemaining()) {
            throw new BufferUnderflowException();
        }
        buffer.flip();
        return buffer;
    }

    static void putWithChecksum(ByteBuffer buffer, int value, Adler32 checksum) {
        buffer.putInt(value);
        checksum.update(value);
    }

    static void putWithChecksum(ByteBuffer buffer, long value, Adler32 checksum) {
        buffer.putLong(value);
        checksum.update((int)(value & 0xFFFFL));
        checksum.update((int)(value >> 32));
    }

    static int getIntWithChecksum(ByteBuffer buffer, Adler32 checksum) {
        final int value = buffer.getInt();
        checksum.update(value);
        return value;
    }

    static long getLongWithChecksum(ByteBuffer buffer, Adler32 checksum) {
        final long value = buffer.getLong();
        checksum.update((int)(value & 0xFFFFL));
        checksum.update((int)(value >> 32));
        return value;
    }
}