159 lines
7.6 KiB
C#
159 lines
7.6 KiB
C#
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#region Using Statements
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using System;
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using System.IO;
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#endregion // Using Statements
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#region License AnxFramework
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//
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// This file is part of the ANX.Framework created by the "ANX.Framework developer group".
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//
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// This file is released under the Ms-PL license.
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//
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//
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//
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// Microsoft Public License (Ms-PL)
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//
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// This license governs use of the accompanying software. If you use the software, you accept this license.
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// If you do not accept the license, do not use the software.
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//
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// 1.Definitions
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// The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning
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// here as under U.S. copyright law.
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// A "contribution" is the original software, or any additions or changes to the software.
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// A "contributor" is any person that distributes its contribution under this license.
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// "Licensed patents" are a contributor's patent claims that read directly on its contribution.
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//
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// 2.Grant of Rights
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// (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations
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// in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to
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// reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution
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// or any derivative works that you create.
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// (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in
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// section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed
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// patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution
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// in the software or derivative works of the contribution in the software.
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//
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// 3.Conditions and Limitations
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// (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
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// (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your
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// patent license from such contributor to the software ends automatically.
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// (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution
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// notices that are present in the software.
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// (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
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// a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or
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// object code form, you may only do so under a license that complies with this license.
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// (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees,
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// or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the
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// extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a
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// particular purpose and non-infringement.
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#endregion // License
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#region License MonoXna
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/*
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MIT License
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Copyright © 2011 The MonoXNA Team
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All rights reserved.
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Authors:
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* Lars Magnusson <lavima@gmail.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#endregion License
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namespace ANX.Framework.Content
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{
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internal static class Decompressor
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{
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public static Stream DecompressStream(BinaryReader reader, Stream input, int num)
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{
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// ... let's decompress it!
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// get the decompressed size (num is our compressed size)
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int decompressedSize = reader.ReadInt32();
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// create a memory stream of that size
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MemoryStream output = new MemoryStream(decompressedSize);
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// save our initial position
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long pos = input.Position;
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// default window size for XNB encoded files is 64Kb (need 16 bits to represent it)
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LzxDecoder decoder = new LzxDecoder(16);
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// start our decode process
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while (pos < num)
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{
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// the compressed stream is seperated into blocks that will decompress
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// into 32Kb or some other size if specified.
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// normal, 32Kb output blocks will have a short indicating the size
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// of the block before the block starts
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// blocks that have a defined output will be preceded by a byte of value
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// 0xFF (255), then a short indicating the output size and another
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// for the block size
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// all shorts for these cases are encoded in big endian order
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int hi, lo, block_size, frame_size;
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// let's get the first byte
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hi = reader.ReadByte();
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// does this block define a frame size?
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if (hi == 0xFF)
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{
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// get our bytes
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hi = reader.ReadByte();
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lo = reader.ReadByte();
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// make a beautiful short baby together
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frame_size = (hi << 8) | lo;
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// let's read the block size
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hi = reader.ReadByte();
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lo = reader.ReadByte();
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block_size = (hi << 8) | lo;
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// add the read in bytes to the position
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pos += 5;
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}
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else
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{
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// just block size, so let's read the rest
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lo = reader.ReadByte();
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block_size = (hi << 8) | lo;
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// frame size is 32Kb by default
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frame_size = 32768;
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// add the read in bytes to the position
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pos += 2;
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}
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// either says there is nothing to decode
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if (block_size == 0 || frame_size == 0)
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break;
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// let's decompress the sucker
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decoder.Decompress(input, block_size, output, frame_size);
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// let's increment the input position by the block size
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pos += block_size;
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// reset the position of the input just incase the bit buffer
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// read in some unused bytes
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input.Seek(pos, SeekOrigin.Begin);
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}
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// finished decoding everything, let's set the decompressed buffer
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// to the beginning and return that
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output.Seek(0, SeekOrigin.Begin);
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return output;
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}
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}
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}
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