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// Copyright (C) 2001 Mike Krueger
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// Copyright (C) 2004 John Reilly
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// This file was translated from java, it was part of the GNU Classpath
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// Copyright (C) 2001 Free Software Foundation, Inc.
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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// Linking this library statically or dynamically with other modules is
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// making a combined work based on this library. Thus, the terms and
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// conditions of the GNU General Public License cover the whole
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// As a special exception, the copyright holders of this library give you
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// permission to link this library with independent modules to produce an
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// executable, regardless of the license terms of these independent
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// modules, and to copy and distribute the resulting executable under
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// terms of your choice, provided that you also meet, for each linked
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// independent module, the terms and conditions of the license of that
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// module. An independent module is a module which is not derived from
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// or based on this library. If you modify this library, you may extend
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// this exception to your version of the library, but you are not
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// obligated to do so. If you do not wish to do so, delete this
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// exception statement from your version.
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namespace PdfSharp.SharpZipLib.Zip.Compression
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/// This class is general purpose class for writing data to a buffer.
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/// It allows you to write bits as well as bytes
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/// Based on DeflaterPending.java
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/// author of the original java version : Jochen Hoenicke
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internal class PendingBuffer
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/// <summary>Internal work buffer
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/// construct instance using default buffer size of 4096
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public PendingBuffer() : this( 4096 )
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/// construct instance using specified buffer size
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/// <param name="bufsize">
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/// size to use for internal buffer
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public PendingBuffer(int bufsize)
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buf = new byte[bufsize];
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/// Clear internal state/buffers
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start = end = bitCount = 0;
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/// write a byte to buffer
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public void WriteByte(int b)
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if (DeflaterConstants.DEBUGGING && start != 0) {
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throw new SharpZipBaseException();
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buf[end++] = (byte) b;
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/// Write a short value to buffer LSB first
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public void WriteShort(int s)
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if (DeflaterConstants.DEBUGGING && start != 0) {
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throw new SharpZipBaseException();
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buf[end++] = (byte) s;
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buf[end++] = (byte) (s >> 8);
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/// write an integer LSB first
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/// <param name="s">value to write</param>
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public void WriteInt(int s)
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if (DeflaterConstants.DEBUGGING && start != 0) {
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throw new SharpZipBaseException();
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buf[end++] = (byte) s;
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buf[end++] = (byte) (s >> 8);
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buf[end++] = (byte) (s >> 16);
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buf[end++] = (byte) (s >> 24);
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/// Write a block of data to buffer
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/// <param name="block">data to write</param>
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/// <param name="offset">offset of first byte to write</param>
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/// <param name="len">number of bytes to write</param>
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public void WriteBlock(byte[] block, int offset, int len)
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if (DeflaterConstants.DEBUGGING && start != 0) {
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throw new SharpZipBaseException();
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System.Array.Copy(block, offset, buf, end, len);
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/// The number of bits written to the buffer
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public int BitCount {
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/// Align internal buffer on a byte boundary
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public void AlignToByte()
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if (DeflaterConstants.DEBUGGING && start != 0) {
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throw new SharpZipBaseException();
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buf[end++] = (byte) bits;
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buf[end++] = (byte) (bits >> 8);
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/// Write bits to internal buffer
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/// <param name="b">source of bits</param>
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/// <param name="count">number of bits to write</param>
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public void WriteBits(int b, int count)
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if (DeflaterConstants.DEBUGGING && start != 0) {
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throw new SharpZipBaseException();
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// if (DeflaterConstants.DEBUGGING) {
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// //Console.WriteLine("writeBits("+b+","+count+")");
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bits |= (uint)(b << bitCount);
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if (bitCount >= 16) {
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buf[end++] = (byte) bits;
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buf[end++] = (byte) (bits >> 8);
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/// Write a short value to internal buffer most significant byte first
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/// <param name="s">value to write</param>
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public void WriteShortMSB(int s)
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if (DeflaterConstants.DEBUGGING && start != 0) {
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throw new SharpZipBaseException();
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buf[end++] = (byte) (s >> 8);
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buf[end++] = (byte) s;
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/// Indicates if buffer has been flushed
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public bool IsFlushed {
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/// Flushes the pending buffer into the given output array. If the
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/// output array is to small, only a partial flush is done.
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/// <param name="output">
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/// the output array;
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/// <param name="offset">
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/// the offset into output array;
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/// <param name="length">
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/// length the maximum number of bytes to store;
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/// <exception name="ArgumentOutOfRangeException">
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/// IndexOutOfBoundsException if offset or length are invalid.
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public int Flush(byte[] output, int offset, int length)
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buf[end++] = (byte) bits;
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if (length > end - start) {
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length = end - start;
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System.Array.Copy(buf, start, output, offset, length);
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System.Array.Copy(buf, start, output, offset, length);
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/// Convert internal buffer to byte array.
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/// Buffer is empty on completion
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/// converted buffer contents contents
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public byte[] ToByteArray()
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byte[] ret = new byte[end - start];
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System.Array.Copy(buf, start, ret, 0, ret.Length);
added
removed
lib/PdfSharp/PdfSharp.SharpZipLib/Zip/Compression/PendingBuffer.cs
