assimp/code/IFF.h

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// Definitions for the Interchange File Format (IFF)
// Alexander Gessler, 2006
// Adapted for Assimp August 2008
#ifndef AI_IFF_H_INCLUDED
#define AI_IFF_H_INCLUDED
#include "ByteSwap.h"
namespace Assimp {
namespace IFF {
//! Describes an IFF chunk header
struct ChunkHeader
{
//! Type of the chunk header - FourCC
uint32_t type;
//! Length of the chunk data, in bytes
uint32_t length;
};
#define AI_IFF_FOURCC(a,b,c,d) ((uint32_t) (((uint8_t)a << 24u) | \
((uint8_t)b << 16u) | ((uint8_t)c << 8u) | ((uint8_t)d)))
#define AI_IFF_FOURCC_FORM AI_IFF_FOURCC('F','O','R','M')
/////////////////////////////////////////////////////////////////////////////////
//! Read the file header and return the type of the file and its size
//! @param outFile Pointer to the file data. The buffer must at
//! least be 12 bytes large.
//! @param fileType Receives the type of the file
//! @return 0 if everything was OK, otherwise an error message
/////////////////////////////////////////////////////////////////////////////////
inline const char* ReadHeader(const uint8_t* outFile,uint32_t& fileType)
{
LE_NCONST ChunkHeader* head = (LE_NCONST ChunkHeader*) outFile;
AI_LSWAP4(head->length);
AI_LSWAP4(head->type);
if(AI_IFF_FOURCC_FORM != head->type)
{
return "The file is not an IFF file: FORM chunk is missing";
}
fileType = *((uint32_t*)(head+1));
AI_LSWAP4(fileType);
return 0;
}
}}
#endif // !! AI_IFF_H_INCLUDED