/[svn]/libgig/trunk/src/RIFF.cpp
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revision 2542 by schoenebeck, Mon Nov 25 02:22:38 2013 UTC revision 2543 by schoenebeck, Sat May 10 02:06:58 2014 UTC
# Line 2  Line 2 
2   *                                                                         *   *                                                                         *
3   *   libgig - C++ cross-platform Gigasampler format file access library    *   *   libgig - C++ cross-platform Gigasampler format file access library    *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003-2013 by Christian Schoenebeck                      *   *   Copyright (C) 2003-2014 by Christian Schoenebeck                      *
6   *                              <cuse@users.sourceforge.net>               *   *                              <cuse@users.sourceforge.net>               *
7   *                                                                         *   *                                                                         *
8   *   This library is free software; you can redistribute it and/or modify  *   *   This library is free software; you can redistribute it and/or modify  *
# Line 281  namespace RIFF { Line 281  namespace RIFF {
281         #if DEBUG         #if DEBUG
282         std::cout << "Chunk::Read(void*,ulong,ulong)" << std::endl;         std::cout << "Chunk::Read(void*,ulong,ulong)" << std::endl;
283         #endif // DEBUG         #endif // DEBUG
284          if (ulStartPos == 0) return 0; // is only 0 if this is a new chunk, so nothing to read (yet)          //if (ulStartPos == 0) return 0; // is only 0 if this is a new chunk, so nothing to read (yet)
285          if (ulPos >= CurrentChunkSize) return 0;          if (ulPos >= CurrentChunkSize) return 0;
286          if (ulPos + WordCount * WordSize >= CurrentChunkSize) WordCount = (CurrentChunkSize - ulPos) / WordSize;          if (ulPos + WordCount * WordSize >= CurrentChunkSize) WordCount = (CurrentChunkSize - ulPos) / WordSize;
287          #if POSIX          #if POSIX
# Line 751  namespace RIFF { Line 751  namespace RIFF {
751       * @see ReleaseChunkData()       * @see ReleaseChunkData()
752       */       */
753      void* Chunk::LoadChunkData() {      void* Chunk::LoadChunkData() {
754          if (!pChunkData && pFile->Filename != "" && ulStartPos != 0) {          if (!pChunkData && pFile->Filename != "" /*&& ulStartPos != 0*/) {
755              #if POSIX              #if POSIX
756              if (lseek(pFile->hFileRead, ulStartPos, SEEK_SET) == -1) return NULL;              if (lseek(pFile->hFileRead, ulStartPos, SEEK_SET) == -1) return NULL;
757              #elif defined(WIN32)              #elif defined(WIN32)
# Line 1419  namespace RIFF { Line 1419  namespace RIFF {
1419       * @param FileType - four-byte identifier of the RIFF file type       * @param FileType - four-byte identifier of the RIFF file type
1420       * @see AddSubChunk(), AddSubList(), SetByteOrder()       * @see AddSubChunk(), AddSubList(), SetByteOrder()
1421       */       */
1422      File::File(uint32_t FileType) : List(this), bIsNewFile(true) {      File::File(uint32_t FileType)
1423            : List(this), bIsNewFile(true), Layout(layout_standard)
1424        {
1425          //HACK: see _GET_RESIZED_CHUNKS() comment          //HACK: see _GET_RESIZED_CHUNKS() comment
1426          ResizedChunks.push_back(reinterpret_cast<Chunk*>(new std::set<Chunk*>));          ResizedChunks.push_back(reinterpret_cast<Chunk*>(new std::set<Chunk*>));
1427          #if defined(WIN32)          #if defined(WIN32)
# Line 1441  namespace RIFF { Line 1443  namespace RIFF {
1443       * @throws RIFF::Exception if error occured while trying to load the       * @throws RIFF::Exception if error occured while trying to load the
1444       *                         given RIFF file       *                         given RIFF file
1445       */       */
1446      File::File(const String& path) : List(this), Filename(path), bIsNewFile(false) {      File::File(const String& path)
1447            : List(this), Filename(path), bIsNewFile(false), Layout(layout_standard)
1448        {
1449         #if DEBUG         #if DEBUG
1450         std::cout << "File::File("<<path<<")" << std::endl;         std::cout << "File::File("<<path<<")" << std::endl;
1451         #endif // DEBUG         #endif // DEBUG
1452            bEndianNative = true;
1453          try {          try {
1454              bEndianNative = true;              __openExistingFile(path);
             //HACK: see _GET_RESIZED_CHUNKS() comment  
             ResizedChunks.push_back(reinterpret_cast<Chunk*>(new std::set<Chunk*>));  
             #if POSIX  
             hFileRead = hFileWrite = open(path.c_str(), O_RDONLY | O_NONBLOCK);  
             if (hFileRead <= 0) {  
                 hFileRead = hFileWrite = 0;  
                 throw RIFF::Exception("Can't open \"" + path + "\"");  
             }  
             #elif defined(WIN32)  
             hFileRead = hFileWrite = CreateFile(  
                                          path.c_str(), GENERIC_READ,  
                                          FILE_SHARE_READ | FILE_SHARE_WRITE,  
                                          NULL, OPEN_EXISTING,  
                                          FILE_ATTRIBUTE_NORMAL |  
                                          FILE_FLAG_RANDOM_ACCESS, NULL  
                                      );  
             if (hFileRead == INVALID_HANDLE_VALUE) {  
                 hFileRead = hFileWrite = INVALID_HANDLE_VALUE;  
                 throw RIFF::Exception("Can't open \"" + path + "\"");  
             }  
             #else  
             hFileRead = hFileWrite = fopen(path.c_str(), "rb");  
             if (!hFileRead) throw RIFF::Exception("Can't open \"" + path + "\"");  
             #endif // POSIX  
             Mode = stream_mode_read;  
             ulStartPos = RIFF_HEADER_SIZE;  
             ReadHeader(0);  
1455              if (ChunkID != CHUNK_ID_RIFF && ChunkID != CHUNK_ID_RIFX) {              if (ChunkID != CHUNK_ID_RIFF && ChunkID != CHUNK_ID_RIFX) {
1456                  throw RIFF::Exception("Not a RIFF file");                  throw RIFF::Exception("Not a RIFF file");
1457              }              }
# Line 1484  namespace RIFF { Line 1462  namespace RIFF {
1462          }          }
1463      }      }
1464    
1465        /** @brief Load existing RIFF-like file.
1466         *
1467         * Loads an existing file, which is not a "real" RIFF file, but similar to
1468         * an ordinary RIFF file.
1469         *
1470         * A "real" RIFF file contains at top level a List chunk either with chunk
1471         * ID "RIFF" or "RIFX". The simple constructor above expects this to be
1472         * case, and if it finds the toplevel List chunk to have another chunk ID
1473         * than one of those two expected ones, it would throw an Exception and
1474         * would refuse to load the file accordingly.
1475         *
1476         * Since there are however a lot of file formats which use the same simple
1477         * principles of the RIFF format, with another toplevel List chunk ID
1478         * though, you can use this alternative constructor here to be able to load
1479         * and handle those files in the same way as you would do with "real" RIFF
1480         * files.
1481         *
1482         * @param path - path and file name of the RIFF-alike file to be opened
1483         * @param FileType - expected toplevel List chunk ID (this is the very
1484         *                   first chunk found in the file)
1485         * @param Endian - whether the file uses little endian or big endian layout
1486         * @param layout - general file structure type
1487         * @throws RIFF::Exception if error occured while trying to load the
1488         *                         given RIFF-alike file
1489         */
1490        File::File(const String& path, uint32_t FileType, endian_t Endian, layout_t layout)
1491            : List(this), Filename(path), bIsNewFile(false), Layout(layout)
1492        {
1493            SetByteOrder(Endian);
1494            try {
1495                __openExistingFile(path, &FileType);
1496            }
1497            catch (...) {
1498                Cleanup();
1499                throw;
1500            }
1501        }
1502    
1503        /**
1504         * Opens an already existing RIFF file or RIFF-alike file. This method
1505         * shall only be called once (in a File class constructor).
1506         *
1507         * @param path - path and file name of the RIFF file or RIFF-alike file to
1508         *               be opened
1509         * @param FileType - (optional) expected chunk ID of first chunk in file
1510         * @throws RIFF::Exception if error occured while trying to load the
1511         *                         given RIFF file or RIFF-alike file
1512         */
1513        void File::__openExistingFile(const String& path, uint32_t* FileType) {
1514            //HACK: see _GET_RESIZED_CHUNKS() comment
1515            ResizedChunks.push_back(reinterpret_cast<Chunk*>(new std::set<Chunk*>));
1516            #if POSIX
1517            hFileRead = hFileWrite = open(path.c_str(), O_RDONLY | O_NONBLOCK);
1518            if (hFileRead <= 0) {
1519                hFileRead = hFileWrite = 0;
1520                throw RIFF::Exception("Can't open \"" + path + "\"");
1521            }
1522            #elif defined(WIN32)
1523            hFileRead = hFileWrite = CreateFile(
1524                                         path.c_str(), GENERIC_READ,
1525                                         FILE_SHARE_READ | FILE_SHARE_WRITE,
1526                                         NULL, OPEN_EXISTING,
1527                                         FILE_ATTRIBUTE_NORMAL |
1528                                         FILE_FLAG_RANDOM_ACCESS, NULL
1529                                     );
1530            if (hFileRead == INVALID_HANDLE_VALUE) {
1531                hFileRead = hFileWrite = INVALID_HANDLE_VALUE;
1532                throw RIFF::Exception("Can't open \"" + path + "\"");
1533            }
1534            #else
1535            hFileRead = hFileWrite = fopen(path.c_str(), "rb");
1536            if (!hFileRead) throw RIFF::Exception("Can't open \"" + path + "\"");
1537            #endif // POSIX
1538            Mode = stream_mode_read;
1539            switch (Layout) {
1540                case layout_standard: // this is a normal RIFF file
1541                    ulStartPos = RIFF_HEADER_SIZE;
1542                    ReadHeader(0);
1543                    if (FileType && ChunkID != *FileType)
1544                        throw RIFF::Exception("Invalid file container ID");
1545                    break;
1546                case layout_flat: // non-standard RIFF-alike file
1547                    ulStartPos = 0;
1548                    NewChunkSize = CurrentChunkSize = GetFileSize();
1549                    if (FileType) {
1550                        uint32_t ckid;
1551                        if (Read(&ckid, 4, 1) != 4) {
1552                            throw RIFF::Exception("Invalid file header ID (premature end of header)");
1553                        } else if (ckid != *FileType) {
1554                            String s = " (expected '" + convertToString(*FileType) + "' but got '" + convertToString(ckid) + "')";
1555                            throw RIFF::Exception("Invalid file header ID" + s);
1556                        }
1557                        SetPos(0); // reset to first byte of file
1558                    }
1559                    LoadSubChunks();
1560                    break;
1561            }
1562        }
1563    
1564      String File::GetFileName() {      String File::GetFileName() {
1565          return Filename;          return Filename;
1566      }      }
# Line 1496  namespace RIFF { Line 1573  namespace RIFF {
1573          return Mode;          return Mode;
1574      }      }
1575    
1576        layout_t File::GetLayout() const {
1577            return Layout;
1578        }
1579    
1580      /** @brief Change file access mode.      /** @brief Change file access mode.
1581       *       *
1582       * Changes files access mode either to read-only mode or to read/write       * Changes files access mode either to read-only mode or to read/write
# Line 1628  namespace RIFF { Line 1709  namespace RIFF {
1709       *                         chunk or any kind of IO error occured       *                         chunk or any kind of IO error occured
1710       */       */
1711      void File::Save() {      void File::Save() {
1712            //TODO: implementation for the case where first chunk is not a global container (List chunk) is not implemented yet (i.e. Korg files)
1713            if (Layout == layout_flat)
1714                throw Exception("Saving a RIFF file with layout_flat is not implemented yet");
1715    
1716          // make sure the RIFF tree is built (from the original file)          // make sure the RIFF tree is built (from the original file)
1717          LoadSubChunksRecursively();          LoadSubChunksRecursively();
1718    
# Line 1719  namespace RIFF { Line 1804  namespace RIFF {
1804      void File::Save(const String& path) {      void File::Save(const String& path) {
1805          //TODO: we should make a check here if somebody tries to write to the same file and automatically call the other Save() method in that case          //TODO: we should make a check here if somebody tries to write to the same file and automatically call the other Save() method in that case
1806    
1807            //TODO: implementation for the case where first chunk is not a global container (List chunk) is not implemented yet (i.e. Korg files)
1808            if (Layout == layout_flat)
1809                throw Exception("Saving a RIFF file with layout_flat is not implemented yet");
1810    
1811          // make sure the RIFF tree is built (from the original file)          // make sure the RIFF tree is built (from the original file)
1812          LoadSubChunksRecursively();          LoadSubChunksRecursively();
1813    

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