org.wildfly.common.archive.ByteBufferInputStream Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.wildfly.common.archive;

import java.io.InputStream;
import java.nio.ByteBuffer;

final class ByteBufferInputStream extends InputStream {
    private final ByteBuffer[] bufs;
    private final long offset;
    private final long size;
    long pos;
    long mark;

    ByteBufferInputStream(final ByteBuffer[] bufs, final long offset, final long size) {
        this.bufs = bufs;
        this.offset = offset;
        this.size = size;
    }

    public int read() {
        return pos < size ? Archive.getByte(bufs, offset + pos++) : -1;
    }

    public int read(final byte[] b) {
        return read(b, 0, b.length);
    }

    public int read(final byte[] b, final int off, final int len) {
        final long rem = size - pos;
        if (rem == 0) return -1;
        final int realLen = (int) Math.min(len, rem);
        if (realLen > 0) {
            Archive.readBytes(bufs, offset + pos, b, off, realLen);
            return realLen;
        } else {
            return 0;
        }
    }

    public long skip(final long n) {
        final long rem = size - pos;
        final long cnt = Math.min(rem, n);
        if (cnt > 0) {
            pos += cnt;
            return cnt;
        } else {
            return 0;
        }
    }

    public int available() {
        return (int) Math.min(Integer.MAX_VALUE, size - pos);
    }

    public void close() {
    }

    public void mark(final int readLimit) {
        mark = pos;
    }

    public void reset() {
        pos = mark;
    }

    public boolean markSupported() {
        return true;
    }
}