B3D:
Specifications
Sample Blitz Code
;
;b3d file utils to be included
;
Dim b3d_stack(100)
Global b3d_file,b3d_tos
Function b3dSetFile( file )
b3d_tos=0
b3d_file=file
End Function
;***** functions for reading from B3D files *****
Function b3dReadByte()
Return ReadByte( b3d_file )
End Function
Function b3dReadInt()
Return ReadInt( b3d_file )
End Function
Function b3dReadFloat#()
Return ReadFloat( b3d_file )
End Function
Function b3dReadString$()
Repeat
ch=b3dReadByte()
If ch=0 Return t$
t$=t$+Chr$(ch)
Forever
End Function
Function b3dReadChunk$()
For k=1 To 4
tag$=tag$+Chr$(b3dReadByte())
Next
sz=ReadInt( b3d_file )
b3d_tos=b3d_tos+1
b3d_stack(b3d_tos)=FilePos( b3d_file )+sz
Return tag$
End Function
Function b3dExitChunk()
SeekFile b3d_file,b3d_stack(b3d_tos)
b3d_tos=b3d_tos-1
End Function
Function b3dChunkSize()
Return b3d_stack(b3d_tos)-FilePos( b3d_file )
End Function
;***** Functions for writing to B3D files *****
Function b3dWriteByte( n )
WriteByte( b3d_file,n )
End Function
Function b3dWriteInt( n )
WriteInt( b3d_file,n )
End Function
Function b3dWriteFloat( n# )
WriteFloat( b3d_file,n )
End Function
Function b3dWriteString( t$ )
For k=1 To Len( t$ )
ch=Asc(Mid$(t$,k,1))
b3dWriteByte(ch)
If ch=0 Return
Next
b3dWriteByte( 0 )
End Function
Function b3dBeginChunk( tag$ )
b3d_tos=b3d_tos+1
For k=1 To 4
b3dWriteByte(Asc(Mid$( tag$,k,1 )))
Next
b3dWriteInt( 0 )
b3d_stack(b3d_tos)=FilePos( b3d_file )
End Function
Function b3dEndChunk()
n=FilePos( b3d_file )
SeekFile b3d_file,b3d_stack(b3d_tos)-4
b3dWriteInt( n-b3d_stack(b3d_tos) )
SeekFile b3d_file,n
b3d_tos=b3d_tos-1
End Function
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