/[svn]/libgig/trunk/src/RIFF.cpp
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revision 1093 by schoenebeck, Sun Mar 11 17:44:31 2007 UTC revision 1383 by schoenebeck, Fri Oct 5 09:39:12 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        static 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 70  namespace RIFF { Line 89  namespace RIFF {
89      }      }
90    
91      Chunk::~Chunk() {      Chunk::~Chunk() {
92            if (CurrentChunkSize != NewChunkSize) pFile->UnlogResized(this);
93          if (pChunkData) delete[] pChunkData;          if (pChunkData) delete[] pChunkData;
94      }      }
95    
# Line 215  namespace RIFF { Line 235  namespace RIFF {
235       *  - RIFF::stream_closed :       *  - RIFF::stream_closed :
236       *    the data stream was closed somehow, no more reading possible       *    the data stream was closed somehow, no more reading possible
237       *  - RIFF::stream_end_reached :       *  - RIFF::stream_end_reached :
238       *    alreaady reached the end of the chunk data, no more reading       *    already reached the end of the chunk data, no more reading
239       *    possible without SetPos()       *    possible without SetPos()
240       */       */
241      stream_state_t Chunk::GetState() {      stream_state_t Chunk::GetState() {
# Line 774  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 1134  namespace RIFF { Line 1155  namespace RIFF {
1155          return pNewChunk;          return pNewChunk;
1156      }      }
1157    
1158        /** @brief Moves a sub chunk.
1159         *
1160         * Moves a sub chunk from one position in a list to another
1161         * position in the same list. The pSrc chunk is placed before the
1162         * pDst chunk.
1163         *
1164         * @param pSrc - sub chunk to be moved
1165         * @param pDst - the position to move to. pSrc will be placed
1166         *               before pDst. If pDst is 0, pSrc will be placed
1167         *               last in list.
1168         */
1169        void List::MoveSubChunk(Chunk* pSrc, Chunk* pDst) {
1170            if (!pSubChunks) LoadSubChunks();
1171            pSubChunks->remove(pSrc);
1172            ChunkList::iterator iter = find(pSubChunks->begin(), pSubChunks->end(), pDst);
1173            pSubChunks->insert(iter, pSrc);
1174        }
1175    
1176      /** @brief Creates a new list sub chunk.      /** @brief Creates a new list sub chunk.
1177       *       *
1178       * Creates and adds a new list sub chunk to this list chunk. Note that       * Creates and adds a new list sub chunk to this list chunk. Note that
# Line 1229  namespace RIFF { Line 1268  namespace RIFF {
1268          if (!pSubChunks) {          if (!pSubChunks) {
1269              pSubChunks    = new ChunkList();              pSubChunks    = new ChunkList();
1270              pSubChunksMap = new ChunkMap();              pSubChunksMap = new ChunkMap();
1271                #if defined(WIN32)
1272                if (pFile->hFileRead == INVALID_HANDLE_VALUE) return;
1273                #else
1274              if (!pFile->hFileRead) return;              if (!pFile->hFileRead) return;
1275                #endif
1276              unsigned long uiOriginalPos = GetPos();              unsigned long uiOriginalPos = GetPos();
1277              SetPos(0); // jump to beginning of list chunk body              SetPos(0); // jump to beginning of list chunk body
1278              while (RemainingBytes() >= CHUNK_HEADER_SIZE) {              while (RemainingBytes() >= CHUNK_HEADER_SIZE) {
# Line 1325  namespace RIFF { Line 1368  namespace RIFF {
1368       * "from scratch". Note: there must be no empty chunks or empty list       * "from scratch". Note: there must be no empty chunks or empty list
1369       * chunks when trying to make the new RIFF file persistent with Save()!       * chunks when trying to make the new RIFF file persistent with Save()!
1370       *       *
1371         * Note: by default, the RIFF file will be saved in native endian
1372         * format; that is, as a RIFF file on little-endian machines and
1373         * as a RIFX file on big-endian. To change this behaviour, call
1374         * SetByteOrder() before calling Save().
1375         *
1376       * @param FileType - four-byte identifier of the RIFF file type       * @param FileType - four-byte identifier of the RIFF file type
1377       * @see AddSubChunk(), AddSubList()       * @see AddSubChunk(), AddSubList(), SetByteOrder()
1378       */       */
1379      File::File(uint32_t FileType) : List(this) {      File::File(uint32_t FileType) : List(this) {
1380          #if defined(WIN32)          #if defined(WIN32)
# Line 1454  namespace RIFF { Line 1502  namespace RIFF {
1502                                                       NULL, OPEN_EXISTING,                                                       NULL, OPEN_EXISTING,
1503                                                       FILE_ATTRIBUTE_NORMAL, NULL                                                       FILE_ATTRIBUTE_NORMAL, NULL
1504                                                   );                                                   );
1505                          throw Exception("Could not (re)open file \"" + Filename + "\" in read mode");                          throw Exception("Could not (re)open file \"" + Filename + "\" in read+write mode");
1506                      }                      }
1507                      #else                      #else
1508                      if (hFileRead) fclose(hFileRead);                      if (hFileRead) fclose(hFileRead);
# Line 1488  namespace RIFF { Line 1536  namespace RIFF {
1536          return false;          return false;
1537      }      }
1538    
1539        /** @brief Set the byte order to be used when saving.
1540         *
1541         * Set the byte order to be used in the file. A value of
1542         * endian_little will create a RIFF file, endian_big a RIFX file
1543         * and endian_native will create a RIFF file on little-endian
1544         * machines and RIFX on big-endian machines.
1545         *
1546         * @param Endian - endianess to use when file is saved.
1547         */
1548        void File::SetByteOrder(endian_t Endian) {
1549            #if WORDS_BIGENDIAN
1550            bEndianNative = Endian != endian_little;
1551            #else
1552            bEndianNative = Endian != endian_big;
1553            #endif
1554        }
1555    
1556      /** @brief Save changes to same file.      /** @brief Save changes to same file.
1557       *       *
1558       * 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 1515  namespace RIFF { Line 1580  namespace RIFF {
1580          // first we sum up all positive chunk size changes (and skip all negative ones)          // first we sum up all positive chunk size changes (and skip all negative ones)
1581          unsigned long ulPositiveSizeDiff = 0;          unsigned long ulPositiveSizeDiff = 0;
1582          for (ChunkList::iterator iter = ResizedChunks.begin(), end = ResizedChunks.end(); iter != end; ++iter) {          for (ChunkList::iterator iter = ResizedChunks.begin(), end = ResizedChunks.end(); iter != end; ++iter) {
1583              if ((*iter)->GetNewSize() == 0) throw Exception("There is at least one empty chunk (zero size)");              if ((*iter)->GetNewSize() == 0) {
1584                    throw Exception("There is at least one empty chunk (zero size): " + __resolveChunkPath(*iter));
1585                }
1586              if ((*iter)->GetNewSize() + 1L > (*iter)->GetSize()) {              if ((*iter)->GetNewSize() + 1L > (*iter)->GetSize()) {
1587                  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
1588                  ulPositiveSizeDiff += ulDiff;                  ulPositiveSizeDiff += ulDiff;
# Line 1627  namespace RIFF { Line 1694  namespace RIFF {
1694          // forget all resized chunks          // forget all resized chunks
1695          ResizedChunks.clear();          ResizedChunks.clear();
1696    
1697          if (Filename.length() > 0) {          #if POSIX
1698              #if POSIX          if (hFileWrite) close(hFileWrite);
1699              close(hFileWrite);          #elif defined(WIN32)
1700              #elif defined(WIN32)          if (hFileWrite != INVALID_HANDLE_VALUE) CloseHandle(hFileWrite);
1701              CloseHandle(hFileWrite);          #else
1702              #else          if (hFileWrite) fclose(hFileWrite);
1703              fclose(hFileWrite);          #endif
1704              #endif          hFileWrite = hFileRead;
             hFileWrite = hFileRead;  
         }  
1705    
1706          // associate new file with this File object from now on          // associate new file with this File object from now on
1707          Filename = path;          Filename = path;
# Line 1676  namespace RIFF { Line 1741  namespace RIFF {
1741          ResizedChunks.push_back(pResizedChunk);          ResizedChunks.push_back(pResizedChunk);
1742      }      }
1743    
1744        void File::UnlogResized(Chunk* pResizedChunk) {
1745            ResizedChunks.remove(pResizedChunk);
1746        }
1747    
1748      unsigned long File::GetFileSize() {      unsigned long File::GetFileSize() {
1749          return __GetFileSize(hFileRead);          return __GetFileSize(hFileRead);
1750      }      }
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