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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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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2017 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 org.wildfly.common.iteration;

import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.Signature;
import java.security.SignatureException;
import java.util.Arrays;
import java.util.NoSuchElementException;

import javax.crypto.Mac;

import org.wildfly.common.bytes.ByteStringBuilder;

/**
 */
final class ByteArrayIterator extends ByteIterator {
    private final int len;
    private final byte[] bytes;
    private final int offs;
    private int idx;

    ByteArrayIterator(final int len, final byte[] bytes, final int offs) {
        this.len = len;
        this.bytes = bytes;
        this.offs = offs;
        idx = 0;
    }

    public boolean hasNext() {
        return idx < len;
    }

    public boolean hasPrevious() {
        return idx > 0;
    }

    public int next() {
        if (! hasNext()) throw new NoSuchElementException();
        return bytes[offs + idx++] & 0xff;
    }

    public int previous() {
        if (! hasPrevious()) throw new NoSuchElementException();
        return bytes[offs + -- idx] & 0xff;
    }

    public int peekNext() throws NoSuchElementException {
        if (! hasNext()) throw new NoSuchElementException();
        return bytes[offs + idx] & 0xff;
    }

    public int peekPrevious() throws NoSuchElementException {
        if (! hasPrevious()) throw new NoSuchElementException();
        return bytes[offs + idx - 1] & 0xff;
    }

    public long getIndex() {
        return idx;
    }

    public void update(final MessageDigest digest) throws IllegalStateException {
        digest.update(bytes, offs + idx, len - idx);
        idx = len;
    }

    public ByteIterator doFinal(final MessageDigest digest) throws IllegalStateException {
        update(digest);
        return ByteIterator.ofBytes(digest.digest());
    }

    public void update(final Mac mac) throws IllegalStateException {
        mac.update(bytes, offs + idx, len - idx);
        idx = len;
    }

    public ByteIterator doFinal(final Mac mac) throws IllegalStateException {
        update(mac);
        return ByteIterator.ofBytes(mac.doFinal());
    }

    public void update(final Signature signature) throws SignatureException {
        signature.update(bytes, offs + idx, len - idx);
        idx = len;
    }

    public boolean verify(final Signature signature) throws SignatureException {
        try {
            return signature.verify(bytes, offs + idx, len - idx);
        } finally {
            idx = len;
        }
    }

    public ByteArrayOutputStream drainTo(final ByteArrayOutputStream stream) {
        stream.write(bytes, offs + idx, len - idx);
        idx = len;
        return stream;
    }

    public byte[] drain() {
        try {
            return Arrays.copyOfRange(bytes, offs + idx, offs + len);
        } finally {
            idx = len;
        }
    }

    public int drain(final byte[] dst, final int offs, final int dlen) {
        int cnt = Math.min(len - idx, dlen);
        System.arraycopy(bytes, offs + idx, dst, offs, cnt);
        idx += cnt;
        return cnt;
    }

    public String drainToUtf8(final int count) {
        int cnt = Math.min(len - idx, count);
        String s = new String(bytes, idx, cnt, StandardCharsets.UTF_8);
        idx += cnt;
        return s;
    }

    public String drainToLatin1(final int count) {
        int cnt = Math.min(len - idx, count);
        String s = new String(bytes, idx, cnt, StandardCharsets.ISO_8859_1);
        idx += cnt;
        return s;
    }

    public ByteStringBuilder appendTo(final ByteStringBuilder builder) {
        builder.append(bytes, offs + idx, len - idx);
        idx = len;
        return builder;
    }
}