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package com.groupon.stomp;

import java.io.IOException;
import java.io.InputStream;


/**
 * Very similar to the java.io.ByteArrayInputStream but this version is not
 * thread safe.
 * Copyright (c) 2013, Groupon, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * Neither the name of GROUPON nor the names of its contributors may be
 * used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * */
public class ByteArrayInputStream extends InputStream {

    byte buffer[];
    int limit;
    int pos;
    int mark;

    public ByteArrayInputStream(byte data[]) {
        this(data, 0, data.length);
    }

    public ByteArrayInputStream(ByteSequence sequence) {
        this(sequence.getData(), sequence.getOffset(), sequence.getLength());
    }

    public ByteArrayInputStream(byte data[], int offset, int size) {
        this.buffer = data;
        this.mark = offset;
        this.pos = offset;
        this.limit = offset + size;
    }

    public int read() throws IOException {
        if (pos < limit) {
            return buffer[pos++] & 0xff;
        } else {
            return -1;
        }
    }

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

    public int read(byte b[], int off, int len) {
        if (pos < limit) {
            len = Math.min(len, limit - pos);
            if (len > 0) {
                System.arraycopy(buffer, pos, b, off, len);
                pos += len;
            }
            return len;
        } else {
            return -1;
        }
    }

    public long skip(long len) throws IOException {
        if (pos < limit) {
            len = Math.min(len, limit - pos);
            if (len > 0) {
                pos += len;
            }
            return len;
        } else {
            return -1;
        }
    }

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

    public boolean markSupported() {
        return true;
    }

    public void mark(int markpos) {
        mark = pos;
    }

    public void reset() {
        pos = mark;
    }
}