/[svn]/libgig/trunk/src/RIFF.cpp
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revision 1102 by persson, Sun Mar 18 07:13:06 2007 UTC revision 1207 by persson, Sat May 26 13:59:40 2007 UTC
# Line 29  Line 29 
29    
30  namespace RIFF {  namespace RIFF {
31    
32    // *************** Internal functions **************
33    // *
34    
35        /// Returns a human readable path of the given chunk.
36        String __resolveChunkPath(Chunk* pCk) {
37            String sPath;
38            for (Chunk* pChunk = pCk; pChunk; pChunk = pChunk->GetParent()) {
39                if (pChunk->GetChunkID() == CHUNK_ID_LIST) {
40                    List* pList = (List*) pChunk;
41                    sPath = "->'" + pList->GetListTypeString() + "'" + sPath;
42                } else {
43                    sPath = "->'" + pChunk->GetChunkIDString() + "'" + sPath;
44                }
45            }
46            return sPath;
47        }
48    
49    
50    
51  // *************** Chunk **************  // *************** Chunk **************
52  // *  // *
53    
# Line 775  namespace RIFF { Line 794  namespace RIFF {
794       * @see File::Save()       * @see File::Save()
795       */       */
796      void Chunk::Resize(int iNewSize) {      void Chunk::Resize(int iNewSize) {
797          if (iNewSize <= 0) throw Exception("Chunk size must be at least one byte");          if (iNewSize <= 0)
798                throw Exception("There is at least one empty chunk (zero size): " + __resolveChunkPath(this));
799          if (NewChunkSize == iNewSize) return;          if (NewChunkSize == iNewSize) return;
800          NewChunkSize = iNewSize;          NewChunkSize = iNewSize;
801          pFile->LogAsResized(this);          pFile->LogAsResized(this);
# Line 1344  namespace RIFF { Line 1364  namespace RIFF {
1364       * "from scratch". Note: there must be no empty chunks or empty list       * "from scratch". Note: there must be no empty chunks or empty list
1365       * chunks when trying to make the new RIFF file persistent with Save()!       * chunks when trying to make the new RIFF file persistent with Save()!
1366       *       *
1367         * Note: by default, the RIFF file will be saved in native endian
1368         * format; that is, as a RIFF file on little-endian machines and
1369         * as a RIFX file on big-endian. To change this behaviour, call
1370         * SetByteOrder() before calling Save().
1371         *
1372       * @param FileType - four-byte identifier of the RIFF file type       * @param FileType - four-byte identifier of the RIFF file type
1373       * @see AddSubChunk(), AddSubList()       * @see AddSubChunk(), AddSubList(), SetByteOrder()
1374       */       */
1375      File::File(uint32_t FileType) : List(this) {      File::File(uint32_t FileType) : List(this) {
1376          #if defined(WIN32)          #if defined(WIN32)
# Line 1507  namespace RIFF { Line 1532  namespace RIFF {
1532          return false;          return false;
1533      }      }
1534    
1535        /** @brief Set the byte order to be used when saving.
1536         *
1537         * Set the byte order to be used in the file. A value of
1538         * endian_little will create a RIFF file, endian_big a RIFX file
1539         * and endian_native will create a RIFF file on little-endian
1540         * machines and RIFX on big-endian machines.
1541         *
1542         * @param Endian - endianess to use when file is saved.
1543         */
1544        void File::SetByteOrder(endian_t Endian) {
1545            #if WORDS_BIGENDIAN
1546            bEndianNative = Endian != endian_little;
1547            #else
1548            bEndianNative = Endian != endian_big;
1549            #endif
1550        }
1551    
1552      /** @brief Save changes to same file.      /** @brief Save changes to same file.
1553       *       *
1554       * Make all changes of all chunks persistent by writing them to the       * Make all changes of all chunks persistent by writing them to the
# Line 1535  namespace RIFF { Line 1577  namespace RIFF {
1577          unsigned long ulPositiveSizeDiff = 0;          unsigned long ulPositiveSizeDiff = 0;
1578          for (ChunkList::iterator iter = ResizedChunks.begin(), end = ResizedChunks.end(); iter != end; ++iter) {          for (ChunkList::iterator iter = ResizedChunks.begin(), end = ResizedChunks.end(); iter != end; ++iter) {
1579              if ((*iter)->GetNewSize() == 0) {              if ((*iter)->GetNewSize() == 0) {
1580                  // just to make the exception message a bit more verbose: resolve the chunk's path                  throw Exception("There is at least one empty chunk (zero size): " + __resolveChunkPath(*iter));
                 String sChunkPath;  
                 for (Chunk* pChunk = *iter; pChunk; pChunk = pChunk->GetParent()) {  
                     if (pChunk->GetChunkID() == CHUNK_ID_LIST) {  
                         List* pList = (List*) pChunk;  
                         sChunkPath = "->'" + pList->GetListTypeString() + "'" + sChunkPath;  
                     } else {  
                         sChunkPath = "->'" + pChunk->GetChunkIDString() + "'" + sChunkPath;  
                     }  
                 }  
                 throw Exception("There is at least one empty chunk (zero size): " + sChunkPath);  
1581              }              }
1582              if ((*iter)->GetNewSize() + 1L > (*iter)->GetSize()) {              if ((*iter)->GetNewSize() + 1L > (*iter)->GetSize()) {
1583                  unsigned long ulDiff = (*iter)->GetNewSize() - (*iter)->GetSize() + 1L; // +1 in case we have to add a pad byte                  unsigned long ulDiff = (*iter)->GetNewSize() - (*iter)->GetSize() + 1L; // +1 in case we have to add a pad byte
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