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Client for SwiftMQ Messaging System with JMS, AMQP 1.0 and file transfer over JMS.

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/*
 * Copyright 2019 IIT Software GmbH
 *
 * IIT Software GmbH licenses this file to You 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 com.swiftmq.tools.util;

import java.io.InputStream;

public class FastByteArrayInputStream extends InputStream {
    byte[] buffer = null;
    int pos = 0;
    int count = 0;

    public void setBuffer(byte[] buffer) {
        this.buffer = buffer;
        pos = 0;
        count = buffer.length;
    }

    public void setBuffer(byte[] buffer, int pos, int len) {
        this.buffer = buffer;
        this.pos = pos;
        count = pos + len;
    }

    public int read() {
        return (pos < count) ? (buffer[pos++] & 0xff) : -1;
    }

    public int read(byte b[], int off, int len) {
        System.arraycopy(buffer, pos, b, off, len);
        pos += len;
        return len;
    }

    public int available() {
        return count - pos;
    }

    public long skip(long n) {
        if (pos + n > count)
            n = count - pos;
        if (n < 0)
            return 0;
        pos += n;
        return n;
    }
}