| /* |
| * 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.commons.sanselan.common; |
| |
| public class BitArrayOutputStream { |
| private byte[] buffer; |
| private int bytesWritten = 0; |
| private int cache = 0; |
| private int cacheMask = 0x80; |
| |
| public BitArrayOutputStream() { |
| buffer = new byte[16]; |
| } |
| |
| public BitArrayOutputStream(int size) { |
| buffer = new byte[size]; |
| } |
| |
| public int size() { |
| return bytesWritten; |
| } |
| |
| public byte[] toByteArray() { |
| flush(); |
| if (bytesWritten == buffer.length) { |
| return buffer; |
| } |
| byte[] out = new byte[bytesWritten]; |
| System.arraycopy(buffer, 0, out, 0, bytesWritten); |
| return out; |
| } |
| |
| public void close() { |
| flush(); |
| } |
| |
| public void flush() { |
| if (cacheMask != 0x80) { |
| writeByte(cache); |
| cache = 0; |
| cacheMask = 0x80; |
| } |
| } |
| |
| public void write(int b) { |
| flush(); |
| writeByte(b); |
| } |
| |
| public void writeBit(int bit) { |
| if (bit != 0) { |
| cache |= cacheMask; |
| } |
| cacheMask >>>= 1; |
| if (cacheMask == 0) { |
| flush(); |
| } |
| } |
| |
| public int getBitsAvailableInCurrentByte() { |
| int count = 0; |
| for (int mask = cacheMask; mask != 0; mask >>>= 1) { |
| ++count; |
| } |
| return count; |
| } |
| |
| private void writeByte(int b) { |
| if (bytesWritten >= buffer.length) { |
| byte[] bigger = new byte[buffer.length * 2]; |
| System.arraycopy(buffer, 0, bigger, 0, bytesWritten); |
| buffer = bigger; |
| } |
| buffer[bytesWritten++] = (byte)b; |
| } |
| } |