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annotate libs/assimp/IFF.h @ 0:b2f14e535253

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author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
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nuclear@0 1
nuclear@0 2
nuclear@0 3 // Definitions for the Interchange File Format (IFF)
nuclear@0 4 // Alexander Gessler, 2006
nuclear@0 5 // Adapted to Assimp August 2008
nuclear@0 6
nuclear@0 7 #ifndef AI_IFF_H_INCLUDED
nuclear@0 8 #define AI_IFF_H_INCLUDED
nuclear@0 9
nuclear@0 10 #include "ByteSwap.h"
nuclear@0 11
nuclear@0 12 namespace Assimp {
nuclear@0 13 namespace IFF {
nuclear@0 14
nuclear@0 15 #include "assimp/Compiler/pushpack1.h"
nuclear@0 16
nuclear@0 17 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 18 //! Describes an IFF chunk header
nuclear@0 19 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 20 struct ChunkHeader
nuclear@0 21 {
nuclear@0 22 //! Type of the chunk header - FourCC
nuclear@0 23 uint32_t type;
nuclear@0 24
nuclear@0 25 //! Length of the chunk data, in bytes
nuclear@0 26 uint32_t length;
nuclear@0 27 } PACK_STRUCT;
nuclear@0 28
nuclear@0 29
nuclear@0 30 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 31 //! Describes an IFF sub chunk header
nuclear@0 32 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 33 struct SubChunkHeader
nuclear@0 34 {
nuclear@0 35 //! Type of the chunk header - FourCC
nuclear@0 36 uint32_t type;
nuclear@0 37
nuclear@0 38 //! Length of the chunk data, in bytes
nuclear@0 39 uint16_t length;
nuclear@0 40 } PACK_STRUCT;
nuclear@0 41
nuclear@0 42 #include "assimp/Compiler/poppack1.h"
nuclear@0 43
nuclear@0 44
nuclear@0 45 #define AI_IFF_FOURCC(a,b,c,d) ((uint32_t) (((uint8_t)a << 24u) | \
nuclear@0 46 ((uint8_t)b << 16u) | ((uint8_t)c << 8u) | ((uint8_t)d)))
nuclear@0 47
nuclear@0 48
nuclear@0 49 #define AI_IFF_FOURCC_FORM AI_IFF_FOURCC('F','O','R','M')
nuclear@0 50
nuclear@0 51
nuclear@0 52 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 53 //! Load a chunk header
nuclear@0 54 //! @param outFile Pointer to the file data - points to the chunk data afterwards
nuclear@0 55 //! @return Pointer to the chunk header
nuclear@0 56 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 57 inline ChunkHeader* LoadChunk(uint8_t*& outFile)
nuclear@0 58 {
nuclear@0 59 ChunkHeader* head = (ChunkHeader*) outFile;
nuclear@0 60 AI_LSWAP4(head->length);
nuclear@0 61 AI_LSWAP4(head->type);
nuclear@0 62 outFile += sizeof(ChunkHeader);
nuclear@0 63 return head;
nuclear@0 64 }
nuclear@0 65
nuclear@0 66 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 67 //! Load a sub chunk header
nuclear@0 68 //! @param outFile Pointer to the file data - points to the chunk data afterwards
nuclear@0 69 //! @return Pointer to the sub chunk header
nuclear@0 70 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 71 inline SubChunkHeader* LoadSubChunk(uint8_t*& outFile)
nuclear@0 72 {
nuclear@0 73 SubChunkHeader* head = (SubChunkHeader*) outFile;
nuclear@0 74 AI_LSWAP2(head->length);
nuclear@0 75 AI_LSWAP4(head->type);
nuclear@0 76 outFile += sizeof(SubChunkHeader);
nuclear@0 77 return head;
nuclear@0 78 }
nuclear@0 79
nuclear@0 80 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 81 //! Read the file header and return the type of the file and its size
nuclear@0 82 //! @param outFile Pointer to the file data. The buffer must at
nuclear@0 83 //! least be 12 bytes large.
nuclear@0 84 //! @param fileType Receives the type of the file
nuclear@0 85 //! @return 0 if everything was OK, otherwise an error message
nuclear@0 86 /////////////////////////////////////////////////////////////////////////////////
nuclear@0 87 inline const char* ReadHeader(uint8_t* outFile,uint32_t& fileType)
nuclear@0 88 {
nuclear@0 89 ChunkHeader* head = LoadChunk(outFile);
nuclear@0 90 if(AI_IFF_FOURCC_FORM != head->type)
nuclear@0 91 {
nuclear@0 92 return "The file is not an IFF file: FORM chunk is missing";
nuclear@0 93 }
nuclear@0 94 fileType = *((uint32_t*)(head+1));
nuclear@0 95 AI_LSWAP4(fileType);
nuclear@0 96 return 0;
nuclear@0 97 }
nuclear@0 98
nuclear@0 99
nuclear@0 100 }}
nuclear@0 101
nuclear@0 102 #endif // !! AI_IFF_H_INCLUDED