RwBinaryStream

Reading Binary Streams

RwStreams are heirarchical streams of sections. Every section consists of:

• (gauranteed) RwHeader
• (gauranteed) RwData child section (the contents are specific to the section type, see definitions below.)
• (optional) Children sections

The RwHeader contains the size (sectionSize member) of all the data and children (and their data and children). This allows you to either skip the entire section and it's children by advancing the stream pointer, or to know when you have parsed all it's children by comparing the stream pointer to the address of the section RwHeader added to the sectionSize.

Simple Pseudo C++ Code to read a Binary Stream

//-----------------------------------------------------------------------
// The RwSection is a base class from which all RwType classes derive

RwSection * ReadSection(FileStream * stream, RwSection * parent)
{
	//-----------------------------------------------------------------------
	// read the header
	
	RwHeader header = ReadRwHeader(stream);
	
	//-----------------------------------------------------------------------
	// create the section - the type returned is based on header.sectionType
	// the reason the parent is passed in is because if the section is an
	// rwDATA what data it reads is dependant on the parent's sectionType and
	// also the number of rwDATA children the parent already has read
	
	RwSection * section = CreateAppropriateSection(stream, header.sectionType, parent);
	
	//-----------------------------------------------------------------------
	// recursively read the children
	
	u8 * endOfSection = stream.GetPosition() + header.sectionSize;
	while(stream.GetPosition() < endOfSection)
	{
		RwSection * childSection = ReadSection(stream, section)
		section->AddChild(childSection);
	}
	
	//-----------------------------------------------------------------------
	// return the newly created section
	
	return section;
}

RwType

enum
{
    rwDATA = 1,
    rwSTRING = 2,
    rwEXTENSION = 3,
    rwTEXTURE = 6,
    rwMATERIAL = 7,
    rwMATERIALLIST = 8,
    rwFRAMELIST = 14,
    rwGEOMETRY = 15,
    rwCLUMP = 16,
    rwLIGHT = 18,
    rwATOMIC = 20,
    rwTEXTURENATIVE = 21,
    rwTEXDICT = 22,
    rwGEOMETRYLIST = 26,
    rwMATERIALSPLIT = 124,
    rwFRAME = 39056126,
    rwPLUGIN_PARTICLES = 0x118,
    rwPLUGIN_MATERIALEFFECTS = 0x120,
    rwPLUGIN_BINMESH = 0x50e,
};

RwHeader

struct RwHeader
{
    s32 sectionType; // RwType
    s32 sectionSize;
    u8 unknown[2];
    s16 versionNumber;
};

RwClump

Possible Children

• RwFrameList
• RwGeometryList
• RwAtomic

RwData (1st, gauranteed)

Data type	Name	Version number	Condition	Notes
u32	objectCount	all
u8[8]	unknown	3074, 4099, 6147

RwData (2nd and subsequent, optional)

Data type	Name	Version number	Condition	Notes
u8[4]	unknown	3074, 4099, 6147

RwGeometry

Possible Children

• RwMaterialList
• In RwExtension
  • RwBinMeshPlugin
  • RwMorphPlugin

RwData (1st, gauranteed)

Data type	Name	Version number	Condition	Notes
u16	flags	all
u8[2]	unknown	all
u32	triangleCount	all
u32	vertexCount	all
u32	morphTargetCount	all
u32	ambientRgba	0, 2048, 3074
u32	diffuseRgba	0, 2048, 3074
u32	specularRgba	0, 2048, 3074
u32[vertexCount]	vertexRgba	all	only if( flags & flags.COLOUR)
f32[vertexCount][2]	uvs	all	only if( flags & flags.TEXTURE)	For versions 0, 2048 and 3074 the u and v are swapped
u16[triangleCount][3]	faces	all		For every face, read 4 u16s. and ignore the 3rd
vector3	boundingSpherePosition	all
f32	boundingSphereRadius	all
u8[8]	unknown	all
vector3[vertexCount]	positions	all
vector3[vertexCount]	normals	all	only if( flags & flags.NORMALS)