| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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 org.apache.kahadb.util; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * Very similar to the java.io.ByteArrayInputStream but this version is not |
| * thread safe. |
| */ |
| 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; |
| } |
| } |