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glbitstream.h

00001 /*
00002 Copyright (c) 2000-2003 Lee Thomason (www.grinninglizard.com)
00003 
00004 Grinning Lizard Utilities. Note that software that uses the 
00005 utility package (including Lilith3D and Kyra) have more restrictive
00006 licences which applies to code outside of the utility package.
00007 
00008 
00009 This software is provided 'as-is', without any express or implied 
00010 warranty. In no event will the authors be held liable for any 
00011 damages arising from the use of this software.
00012 
00013 Permission is granted to anyone to use this software for any 
00014 purpose, including commercial applications, and to alter it and 
00015 redistribute it freely, subject to the following restrictions:
00016 
00017 1. The origin of this software must not be misrepresented; you must 
00018 not claim that you wrote the original software. If you use this 
00019 software in a product, an acknowledgment in the product documentation 
00020 would be appreciated but is not required.
00021 
00022 2. Altered source versions must be plainly marked as such, and 
00023 must not be misrepresented as being the original software.
00024 
00025 3. This notice may not be removed or altered from any source 
00026 distribution.
00027 */
00028 
00029 #ifndef BITSTREAMER_INCLUDED
00030 #define BITSTREAMER_INCLUDED
00031 
00032 #include "../util/gltypes.h"
00033 #include "SDL_rwops.h"
00034 
00035 
00036 class GlBitStream
00037 {
00038   public:
00039         static int BitsNeeded( U32 maxValue );
00040 
00041 };
00042 
00043 class GlWriteBitStream : public GlBitStream
00044 {
00045   public:
00046         GlWriteBitStream( SDL_RWops* fp );
00047         ~GlWriteBitStream();
00048 
00049         void WriteBits( U32 data, int nBitsInData );
00050         void Flush();
00051 
00052   private:
00053         SDL_RWops* fp;
00054 
00055         U8 accum;
00056         int bitsLeft;
00057 };
00058 
00059 
00060 class GlReadBitStream : public GlBitStream
00061 {
00062   public:
00063         GlReadBitStream( SDL_RWops* fp );
00064         ~GlReadBitStream()                              {}
00065 
00066         U32 ReadBits( int nBitsInData );
00067         void Flush();
00068 
00069   private:
00070         SDL_RWops* fp;
00071         int bitsLeft;
00072         U8 accum;
00073 };
00074 
00075 #endif

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