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/*
 * Copyright (c) 2008, Harald Kuhr
 * 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 the copyright holder 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.
 */

package com.twelvemonkeys.imageio.stream;

import javax.imageio.stream.ImageInputStreamImpl;
import java.io.IOException;

import static com.twelvemonkeys.lang.Validate.isTrue;
import static com.twelvemonkeys.lang.Validate.notNull;

/**
 * Experimental
 *
 * @author Harald Kuhr
 * @author last modified by $Author: haraldk$
 * @version $Id: ByteArrayImageInputStream.java,v 1.0 May 15, 2008 2:12:12 PM haraldk Exp$
 */
public final class ByteArrayImageInputStream extends ImageInputStreamImpl {
    private final byte[] data;
    private final int dataOffset;
    private final int dataLength;

    public ByteArrayImageInputStream(final byte[] data) {
        this(data, 0, data != null ? data.length : -1);
    }

    public ByteArrayImageInputStream(final byte[] data, int offset, int length) {
        this.data = notNull(data, "data");
        dataOffset = isMax(data.length, offset, "offset");
        dataLength = isMax(data.length - offset, length, "length");
    }

    private static int isMax(final int high, final int value, final String name) {
        return isTrue(value >= 0 && value <= high, value, String.format("%s out of range [0, %d]: %d", name, high, value));
    }

    public int read() throws IOException {
        if (streamPos >= dataLength) {
            return -1;
        }

        bitOffset = 0;

        return data[((int) streamPos++) + dataOffset] & 0xff;
    }

    public int read(byte[] buffer, int offset, int len) throws IOException {
        if (streamPos >= dataLength) {
            return -1;
        }

        int length = (int) Math.min(dataLength - streamPos, len);
        bitOffset = 0;
        System.arraycopy(data, (int) streamPos + dataOffset, buffer, offset, length);
        streamPos += length;

        return length;
    }

    @Override
    public long length() {
        return dataLength;
    }

    @Override
    public boolean isCached() {
        return true;
    }

    @Override
    public boolean isCachedMemory() {
        return true;
    }
}