com.mycila.hc.io.ByteBufferInputStream.groovy Maven / Gradle / Ivy

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/**
 * Copyright (C) 2013 Mycila ([email protected])
 *
 * 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 com.mycila.hc.io

import java.nio.ByteBuffer

/**
 * @author Mathieu Carbou ([email protected])
 * @date 2014-02-13
 */
class ByteBufferInputStream extends InputStream {
    protected final ByteBuffer buffer

    ByteBufferInputStream(ByteBuffer buffer) {
        this.buffer = buffer
    }

    @Override
    int read() throws IOException {
        return !buffer.hasRemaining() ? -1 : buffer.get() & 0xFF
    }

    @Override
    int read(byte[] bytes, int off, int len) throws IOException {
        if (!buffer.hasRemaining()) {
            return -1
        }
        len = Math.min(len, buffer.remaining())
        buffer.get(bytes, off, len)
        return len
    }
}