openrw/rwengine/include/loaders/rwbinarystream.h

#ifndef _RWBINARYSTREAM_H_
#define _RWBINARYSTREAM_H_
#include <cstdint>
#include <glm/glm.hpp>

#include <cstddef>
#include <cassert>

/**
 * @brief Class for working with RenderWare binary streams.
 *
 * Stream files are split into chunks, each of which may have numerous
 * child chunks (in particular, the "struct" chunk which is used to store
 * data relating to the parent chunk).
 */
class RWBStream
{
	char* _data;
	std::ptrdiff_t _size;
	char* _dataCur;
	char* _nextChunk;
	std::uint32_t _chunkVersion;
	std::ptrdiff_t _currChunkSz;

public:

	typedef std::uint32_t ChunkID;

	RWBStream(char* data, size_t size)
	: _data(data), _size(size), _dataCur(data), _nextChunk(data)
	{}

	/**
	 * Moves the stream to the next chunk and returns it's ID
	 */
	ChunkID getNextChunk()
	{
		// Check that there's any data left
		if( (unsigned)(_dataCur - _data) >= _size ) return 0;

		// _nextChunk is initally = to _data, making this a non-op
		_dataCur = _nextChunk;

		ChunkID id = *(ChunkID*)(_dataCur);
		_dataCur += sizeof(ChunkID);
		_currChunkSz = *(std::uint32_t*)(_dataCur);
		_dataCur += sizeof(std::uint32_t);
		_chunkVersion = *(std::uint32_t*)(_dataCur);
		_dataCur += sizeof(std::uint32_t);

		_nextChunk = _dataCur + _currChunkSz;

		return id;
	}

	char* getCursor() const
	{
		return _dataCur;
	}

	size_t getCurrentChunkSize() const
	{
		return _currChunkSz;
	}

	std::uint32_t getChunkVersion() const
	{
		return _chunkVersion;
	}

	/**
	 * @brief Returns a new stream for the data inside this one.
	 */
	RWBStream getInnerStream() const
	{
		return RWBStream(_dataCur, _currChunkSz);
	}
};

/**
 * @file rwbinarystream.h 
 * Deprecated RenderWare binary stream interface.
 * Contains the structs for the shared Render Ware binary stream data.
 * Many thanks to http://www.gtamodding.com/index.php?title=RenderWare_binary_stream_file
 */

namespace RW
{
	enum {
		SID_Struct       = 0x0001,
		SID_String       = 0x0002,
		SID_Extension    = 0x0003,
		
		SID_Texture      = 0x0006,
		SID_Material     = 0x0007,
		SID_MaterialList = 0x0008,
		
		SID_FrameList    = 0x000E,
		SID_Geometry     = 0x000F,
		SID_Clump        = 0x0010,
		
		SID_Atomic       = 0x0014,
		SID_TextureNative     = 0x0015,
		SID_TextureDictionary = 0x0016,
		
		SID_GeometryList = 0x001A,
		
		SID_HAnimPLG     = 0x011E,
		
		SID_BinMeshPLG   = 0x50E,
		
		SID_NodeName     = 0x0253F2FE
	};

	typedef glm::vec3 BSTVector3;

	typedef glm::mat3 BSTMatrix;

	struct BSSectionHeader
	{
		uint32_t id;
		uint32_t size;
		uint32_t versionid;
	};
	
	struct BSExtension
	{
		
	};
	
	struct BSFrameList
	{
		uint32_t numframes;
	};

	
	struct BSClump 
	{
		uint32_t numatomics;
	};
	
	struct BSStruct
	{
		uint32_t id; // = 0x0001
	};
	
	struct BSGeometryList
	{
		uint32_t numgeometry;
	};
	
	struct BSGeometry
	{
		uint16_t flags;
		uint8_t numuvs;
		uint8_t geomflags;
		uint32_t numtris;
		uint32_t numverts;
		uint32_t numframes;
		
		enum {
			IsTriangleStrip   = 0x1,
			VertexTranslation = 0x2,
			TexCoords1        = 0x4,
			VertexColors      = 0x8,
			StoreNormals      = 0x16,
			DynamicVertexLighting = 0x32,
			ModuleMaterialColor   = 0x64,
			TexCoords2        = 0x128
		};
	};
	
	typedef glm::u8vec4 BSColor;
	
	struct BSGeometryColor
	{
		BSColor ambient;
		BSColor diffuse;
		BSColor specular;
	};
	
	struct BSGeometryUV
	{
		float u;
		float v;
	};
	
	struct BSGeometryTriangle
	{
		uint16_t first;
		uint16_t second;
		uint16_t attrib; // Who designed this nonsense.
		uint16_t third;
	};
	
	struct BSGeometryBounds
	{
		BSTVector3 center;
		float radius;
		uint32_t positions;
		uint32_t normals;
	};
	
	struct BSMaterialList
	{
		uint32_t nummaterials;
	};
	
	struct BSMaterial
	{
		uint32_t unknown;
		BSColor color;
		uint32_t alsounknown;
		uint32_t numtextures;
		float ambient;
		float specular;
		float diffuse;
	};
	
	struct BSTexture
	{
		uint16_t filterflags;
		uint16_t unknown;
	};
	
	struct BSBinMeshPLG
	{
		uint32_t facetype;
		uint32_t numsplits;
		uint32_t numfaces;
	};
	
	struct BSMaterialSplit
	{
		uint32_t numverts;
		uint32_t index;
	};
	
	/**
	 * Texture Dictionary Structures (TXD)
	 */
	struct BSTextureDictionary
	{
		uint16_t numtextures;
		uint16_t unknown;
	};
	
	struct BSTextureNative
	{
		uint32_t platform;
		uint16_t filterflags;
		uint8_t wrapV;
		uint8_t wrapU;
		char diffuseName[32]; 
		char alphaName[32];
		uint32_t rasterformat;
		uint32_t alpha;
		uint16_t width;
		uint16_t height;
		uint8_t bpp;
		uint8_t nummipmaps;
		uint8_t rastertype;
		uint8_t dxttype;
		uint32_t datasize;
		
		enum {
			FILTER_NONE = 0x0,
			FILTER_NEAREST = 0x01,
			FILTER_LINEAR = 0x02,
			FILTER_MIP_NEAREST = 0x03,
			FILTER_MIP_LINEAR = 0x04,
			FILTER_LINEAR_MIP_NEAREST = 0x05,
			FILTER_LINEAR_MIP_LINEAR = 0x06,
			FILTER_MYSTERY_OPTION = 0x1101
		};
		
		enum {
			WRAP_NONE = 0x00,
			WRAP_WRAP  = 0x01,
			WRAP_MIRROR = 0x02,
			WRAP_CLAMP = 0x03
		};
		
		enum {
			FORMAT_DEFAULT = 0x0000, // helpful
			FORMAT_1555    = 0x0100, // Alpha 1, RGB 5 b
			FORMAT_565     = 0x0200, // 5r6g5b
			FORMAT_4444    = 0x0300, // 4 bits each
			FORMAT_LUM8    = 0x0400, // Greyscale
			FORMAT_8888    = 0x0500, // 8 bits each
			FORMAT_888     = 0x0600, // RGB 8 bits each
			FORMAT_555     = 0x0A00, // do not use
			
			FORMAT_EXT_AUTO_MIPMAP = 0x1000, // Generate mipmaps
			FORMAT_EXT_PAL8        = 0x2000, // 256 colour palette
			FORMAT_EXT_PAL4        = 0x4000, // 16 color palette
			FORMAT_EXT_MIPMAP      = 0x8000 // Mipmaps included
		};
	};
	
	struct BSPaletteData
	{
		uint32_t palette[256];
		uint32_t rastersize;
	};
	
	/**
	 * Structure object
	 */
	class BinaryStreamSection
	{
	public:
		/**
		 * Data pointer
		 */
		char* data;
		
		/**
		 * Offset of this section in the data
		 */
		size_t offset;
		
		/**
		 * The BSSectionHeader for the section
		 */
		BSSectionHeader header;
		
		/**
		 * Structure header
		 */
		BSSectionHeader* structure;
		
		BinaryStreamSection(char* data, size_t offset = 0)
		: data(data), offset(offset), structure(nullptr)
		{
			header = *reinterpret_cast<BSSectionHeader*>(data+offset);
			if(header.size > sizeof(structure)) 
			{
				structure = reinterpret_cast<BSSectionHeader*>(data+offset+sizeof(BSSectionHeader));
				if(structure->id != SID_Struct) 
				{
					structure = nullptr;
				}
			}
		}
		
		template<class T> T readStructure()
		{
			return *reinterpret_cast<T*>(data+offset+sizeof(BSSectionHeader)*2);
		}
		
		template<class T> T& readSubStructure(size_t internalOffset)
		{
			return *reinterpret_cast<T*>(data+offset+sizeof(BSSectionHeader)+internalOffset);
		}

		template<class T*> T* readSubStructure(size_t internalOffset)
		{
			return reinterpret_cast<T*>(data+offset+sizeof(BSSectionHeader)+internalOffset);
		}
		
		template<class T> T readRaw(size_t internalOffset)
		{
			return *reinterpret_cast<T*>(data+offset+internalOffset);
		}
		
		char* raw()
		{
			return data + offset + sizeof(BSSectionHeader);
		}
		
		bool hasMoreData(size_t length)
		{
			return (length) < (header.size);
		}
		
		BinaryStreamSection getNextChildSection(size_t& internalOffset)
		{
			size_t realOffset = internalOffset;
			assert(realOffset < header.size);
			BinaryStreamSection sec(data, offset + sizeof(BSSectionHeader) + realOffset);
			internalOffset += sec.header.size + sizeof(BSSectionHeader);
			return sec;
		}
	};
}

#endif