/[svn]/libgig/trunk/src/gig.cpp

Diff of /libgig/trunk/src/gig.cpp

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-revision 2543 by schoenebeck,
Sat May 10 02:06:58 2014 UTC
+revision 2912 by schoenebeck,
Tue May 17 14:30:10 2016 UTC
 Line 2
   *                                                                         *
   *   libgig - C++ cross-platform Gigasampler format file access library    *
   *                                                                         *
-  *   Copyright (C) 2003-2014 by Christian Schoenebeck                      *
+  *   Copyright (C) 2003-2016 by Christian Schoenebeck                      *
   *                              <cuse@users.sourceforge.net>               *
   *                                                                         *
   *   This library is free software; you can redistribute it and/or modify  *
 Line 28
  #include <algorithm>
  #include <math.h>
  #include <iostream>
+ #include <assert.h>
+ /// libgig's current file format version (for extending the original Giga file
+ /// format with libgig's own custom data / custom features).
+ #define GIG_FILE_EXT_VERSION    2
  /// Initial size of the sample buffer which is used for decompression of
  /// compressed sample wave streams - this value should always be bigger than
-Line 52
+Line 57
  namespace gig {
- // *************** progress_t ***************
- // *
-     progress_t::progress_t() {
-         callback    = NULL;
-         custom      = NULL;
-         __range_min = 0.0f;
-         __range_max = 1.0f;
-     }
-     // private helper function to convert progress of a subprocess into the global progress
-     static void __notify_progress(progress_t* pProgress, float subprogress) {
-         if (pProgress && pProgress->callback) {
-             const float totalrange    = pProgress->__range_max - pProgress->__range_min;
-             const float totalprogress = pProgress->__range_min + subprogress * totalrange;
-             pProgress->factor         = totalprogress;
-             pProgress->callback(pProgress); // now actually notify about the progress
-         }
-     }
-     // private helper function to divide a progress into subprogresses
-     static void __divide_progress(progress_t* pParentProgress, progress_t* pSubProgress, float totalTasks, float currentTask) {
-         if (pParentProgress && pParentProgress->callback) {
-             const float totalrange    = pParentProgress->__range_max - pParentProgress->__range_min;
-             pSubProgress->callback    = pParentProgress->callback;
-             pSubProgress->custom      = pParentProgress->custom;
-             pSubProgress->__range_min = pParentProgress->__range_min + totalrange * currentTask / totalTasks;
-             pSubProgress->__range_max = pSubProgress->__range_min + totalrange / totalTasks;
-         }
-     }
  // *************** Internal functions for sample decompression ***************
  // *
-Line 122 
 namespace {
+Line 95 
 namespace {
      void Decompress16(int compressionmode, const unsigned char* params,
                        int srcStep, int dstStep,
                        const unsigned char* pSrc, int16_t* pDst,
-                       unsigned long currentframeoffset,
+                       file_offset_t currentframeoffset,
-                       unsigned long copysamples)
+                       file_offset_t copysamples)
      {
          switch (compressionmode) {
              case 0: // 16 bit uncompressed
-Line 159 
 namespace {
+Line 132 
 namespace {
      void Decompress24(int compressionmode, const unsigned char* params,
                        int dstStep, const unsigned char* pSrc, uint8_t* pDst,
-                       unsigned long currentframeoffset,
+                       file_offset_t currentframeoffset,
-                       unsigned long copysamples, int truncatedBits)
+                       file_offset_t copysamples, int truncatedBits)
      {
          int y, dy, ddy, dddy;
-Line 366 
 namespace {
+Line 339 
 namespace {
       * @param fileNo         - number of an extension file where this sample
       *                         is located, 0 otherwise
       */
-     Sample::Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset, unsigned long fileNo) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) {
+     Sample::Sample(File* pFile, RIFF::List* waveList, file_offset_t WavePoolOffset, unsigned long fileNo) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) {
          static const DLS::Info::string_length_t fixedStringLengths[] = {
              { CHUNK_ID_INAM, 64 },
              { 0, 0 }
-Line 508 
 namespace {
+Line 481 
 namespace {
          const int iReadAtOnce = 32*1024;
          char* buf = new char[iReadAtOnce * orig->FrameSize];
          Sample* pOrig = (Sample*) orig; //HACK: remove constness for now
-         unsigned long restorePos = pOrig->GetPos();
+         file_offset_t restorePos = pOrig->GetPos();
          pOrig->SetPos(0);
          SetPos(0);
-         for (unsigned long n = pOrig->Read(buf, iReadAtOnce); n;
+         for (file_offset_t n = pOrig->Read(buf, iReadAtOnce); n;
                             n = pOrig->Read(buf, iReadAtOnce))
          {
              Write(buf, n);
-Line 527 
 namespace {
+Line 500 
 namespace {
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
       *
+      * @param pProgress - callback function for progress notification
       * @throws DLS::Exception if FormatTag != DLS_WAVE_FORMAT_PCM or no sample data
       *                        was provided yet
       * @throws gig::Exception if there is any invalid sample setting
       */
-     void Sample::UpdateChunks() {
+     void Sample::UpdateChunks(progress_t* pProgress) {
          // first update base class's chunks
-         DLS::Sample::UpdateChunks();
+         DLS::Sample::UpdateChunks(pProgress);
          // make sure 'smpl' chunk exists
          pCkSmpl = pWaveList->GetSubChunk(CHUNK_ID_SMPL);
-Line 595 
 namespace {
+Line 569 
 namespace {
      void Sample::ScanCompressedSample() {
          //TODO: we have to add some more scans here (e.g. determine compression rate)
          this->SamplesTotal = 0;
-         std::list<unsigned long> frameOffsets;
+         std::list<file_offset_t> frameOffsets;
          SamplesPerFrame = BitDepth == 24 ? 256 : 2048;
          WorstCaseFrameSize = SamplesPerFrame * FrameSize + Channels; // +Channels for compression flag
-Line 611 
 namespace {
+Line 585 
 namespace {
                  const int mode_l = pCkData->ReadUint8();
                  const int mode_r = pCkData->ReadUint8();
                  if (mode_l > 5 || mode_r > 5) throw gig::Exception("Unknown compression mode");
-                 const unsigned long frameSize = bytesPerFrame[mode_l] + bytesPerFrame[mode_r];
+                 const file_offset_t frameSize = bytesPerFrame[mode_l] + bytesPerFrame[mode_r];
                  if (pCkData->RemainingBytes() <= frameSize) {
                      SamplesInLastFrame =
-Line 630 
 namespace {
+Line 604 
 namespace {
                  const int mode = pCkData->ReadUint8();
                  if (mode > 5) throw gig::Exception("Unknown compression mode");
-                 const unsigned long frameSize = bytesPerFrame[mode];
+                 const file_offset_t frameSize = bytesPerFrame[mode];
                  if (pCkData->RemainingBytes() <= frameSize) {
                      SamplesInLastFrame =
-Line 646 
 namespace {
+Line 620 
 namespace {
          // Build the frames table (which is used for fast resolving of a frame's chunk offset)
          if (FrameTable) delete[] FrameTable;
-         FrameTable = new unsigned long[frameOffsets.size()];
+         FrameTable = new file_offset_t[frameOffsets.size()];
-         std::list<unsigned long>::iterator end  = frameOffsets.end();
+         std::list<file_offset_t>::iterator end  = frameOffsets.end();
-         std::list<unsigned long>::iterator iter = frameOffsets.begin();
+         std::list<file_offset_t>::iterator iter = frameOffsets.begin();
          for (int i = 0; iter != end; i++, iter++) {
              FrameTable[i] = *iter;
          }
-Line 689 
 namespace {
+Line 663 
 namespace {
       *                      the cached sample data in bytes
       * @see                 ReleaseSampleData(), Read(), SetPos()
       */
-     buffer_t Sample::LoadSampleData(unsigned long SampleCount) {
+     buffer_t Sample::LoadSampleData(file_offset_t SampleCount) {
          return LoadSampleDataWithNullSamplesExtension(SampleCount, 0); // 0 amount of NullSamples
      }
-Line 748 
 namespace {
+Line 722 
 namespace {
       *                           size of the cached sample data in bytes
       * @see                      ReleaseSampleData(), Read(), SetPos()
       */
-     buffer_t Sample::LoadSampleDataWithNullSamplesExtension(unsigned long SampleCount, uint NullSamplesCount) {
+     buffer_t Sample::LoadSampleDataWithNullSamplesExtension(file_offset_t SampleCount, uint NullSamplesCount) {
          if (SampleCount > this->SamplesTotal) SampleCount = this->SamplesTotal;
          if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
-         unsigned long allocationsize = (SampleCount + NullSamplesCount) * this->FrameSize;
+         file_offset_t allocationsize = (SampleCount + NullSamplesCount) * this->FrameSize;
          SetPos(0); // reset read position to begin of sample
          RAMCache.pStart            = new int8_t[allocationsize];
          RAMCache.Size              = Read(RAMCache.pStart, SampleCount) * this->FrameSize;
-Line 849 
 namespace {
+Line 823 
 namespace {
       * @returns            the new sample position
       * @see                Read()
       */
-     unsigned long Sample::SetPos(unsigned long SampleCount, RIFF::stream_whence_t Whence) {
+     file_offset_t Sample::SetPos(file_offset_t SampleCount, RIFF::stream_whence_t Whence) {
          if (Compressed) {
              switch (Whence) {
                  case RIFF::stream_curpos:
-Line 867 
 namespace {
+Line 841 
 namespace {
              }
              if (this->SamplePos > this->SamplesTotal) this->SamplePos = this->SamplesTotal;
-             unsigned long frame = this->SamplePos / 2048; // to which frame to jump
+             file_offset_t frame = this->SamplePos / 2048; // to which frame to jump
              this->FrameOffset   = this->SamplePos % 2048; // offset (in sample points) within that frame
              pCkData->SetPos(FrameTable[frame]);           // set chunk pointer to the start of sought frame
              return this->SamplePos;
          }
          else { // not compressed
-             unsigned long orderedBytes = SampleCount * this->FrameSize;
+             file_offset_t orderedBytes = SampleCount * this->FrameSize;
-             unsigned long result = pCkData->SetPos(orderedBytes, Whence);
+             file_offset_t result = pCkData->SetPos(orderedBytes, Whence);
              return (result == orderedBytes) ? SampleCount
                                              : result / this->FrameSize;
          }
-Line 883 
 namespace {
+Line 857 
 namespace {
      /**
       * Returns the current position in the sample (in sample points).
       */
-     unsigned long Sample::GetPos() const {
+     file_offset_t Sample::GetPos() const {
          if (Compressed) return SamplePos;
          else            return pCkData->GetPos() / FrameSize;
      }
-Line 922 
 namespace {
+Line 896 
 namespace {
       * @returns                number of successfully read sample points
       * @see                    CreateDecompressionBuffer()
       */
-     unsigned long Sample::ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState,
+     file_offset_t Sample::ReadAndLoop(void* pBuffer, file_offset_t SampleCount, playback_state_t* pPlaybackState,
                                        DimensionRegion* pDimRgn, buffer_t* pExternalDecompressionBuffer) {
-         unsigned long samplestoread = SampleCount, totalreadsamples = 0, readsamples, samplestoloopend;
+         file_offset_t samplestoread = SampleCount, totalreadsamples = 0, readsamples, samplestoloopend;
          uint8_t* pDst = (uint8_t*) pBuffer;
          SetPos(pPlaybackState->position); // recover position from the last time
-Line 962 
 namespace {
+Line 936 
 namespace {
                                  // reading, swap all sample frames so it reflects
                                  // backward playback
-                                 unsigned long swapareastart       = totalreadsamples;
+                                 file_offset_t swapareastart       = totalreadsamples;
-                                 unsigned long loopoffset          = GetPos() - loop.LoopStart;
+                                 file_offset_t loopoffset          = GetPos() - loop.LoopStart;
-                                 unsigned long samplestoreadinloop = Min(samplestoread, loopoffset);
+                                 file_offset_t samplestoreadinloop = Min(samplestoread, loopoffset);
-                                 unsigned long reverseplaybackend  = GetPos() - samplestoreadinloop;
+                                 file_offset_t reverseplaybackend  = GetPos() - samplestoreadinloop;
                                  SetPos(reverseplaybackend);
-Line 1013 
 namespace {
+Line 987 
 namespace {
                          // reading, swap all sample frames so it reflects
                          // backward playback
-                         unsigned long swapareastart       = totalreadsamples;
+                         file_offset_t swapareastart       = totalreadsamples;
-                         unsigned long loopoffset          = GetPos() - loop.LoopStart;
+                         file_offset_t loopoffset          = GetPos() - loop.LoopStart;
-                         unsigned long samplestoreadinloop = (this->LoopPlayCount) ? Min(samplestoread, pPlaybackState->loop_cycles_left * loop.LoopLength - loopoffset)
+                         file_offset_t samplestoreadinloop = (this->LoopPlayCount) ? Min(samplestoread, pPlaybackState->loop_cycles_left * loop.LoopLength - loopoffset)
                                                                                    : samplestoread;
-                         unsigned long reverseplaybackend  = loop.LoopStart + Abs((loopoffset - samplestoreadinloop) % loop.LoopLength);
+                         file_offset_t reverseplaybackend  = loop.LoopStart + Abs((loopoffset - samplestoreadinloop) % loop.LoopLength);
                          SetPos(reverseplaybackend);
-Line 1097 
 namespace {
+Line 1071 
 namespace {
       * @returns            number of successfully read sample points
       * @see                SetPos(), CreateDecompressionBuffer()
       */
-     unsigned long Sample::Read(void* pBuffer, unsigned long SampleCount, buffer_t* pExternalDecompressionBuffer) {
+     file_offset_t Sample::Read(void* pBuffer, file_offset_t SampleCount, buffer_t* pExternalDecompressionBuffer) {
          if (SampleCount == 0) return 0;
          if (!Compressed) {
              if (BitDepth == 24) {
-Line 1112 
 namespace {
+Line 1086 
 namespace {
          else {
              if (this->SamplePos >= this->SamplesTotal) return 0;
              //TODO: efficiency: maybe we should test for an average compression rate
-             unsigned long assumedsize      = GuessSize(SampleCount),
+             file_offset_t assumedsize      = GuessSize(SampleCount),
                            remainingbytes   = 0,           // remaining bytes in the local buffer
                            remainingsamples = SampleCount,
                            copysamples, skipsamples,
-Line 1135 
 namespace {
+Line 1109 
 namespace {
              remainingbytes = pCkData->Read(pSrc, assumedsize, 1);
              while (remainingsamples && remainingbytes) {
-                 unsigned long framesamples = SamplesPerFrame;
+                 file_offset_t framesamples = SamplesPerFrame;
-                 unsigned long framebytes, rightChannelOffset = 0, nextFrameOffset;
+                 file_offset_t framebytes, rightChannelOffset = 0, nextFrameOffset;
                  int mode_l = *pSrc++, mode_r = 0;
-Line 1286 
 namespace {
+Line 1260 
 namespace {
       * @throws gig::Exception if sample is compressed
       * @see DLS::LoadSampleData()
       */
-     unsigned long Sample::Write(void* pBuffer, unsigned long SampleCount) {
+     file_offset_t Sample::Write(void* pBuffer, file_offset_t SampleCount) {
          if (Compressed) throw gig::Exception("There is no support for writing compressed gig samples (yet)");
          // if this is the first write in this sample, reset the
-Line 1295 
 namespace {
+Line 1269 
 namespace {
              __resetCRC(crc);
          }
          if (GetSize() < SampleCount) throw Exception("Could not write sample data, current sample size to small");
-         unsigned long res;
+         file_offset_t res;
          if (BitDepth == 24) {
              res = pCkData->Write(pBuffer, SampleCount * FrameSize, 1) / FrameSize;
          } else { // 16 bit
-Line 1329 
 namespace {
+Line 1303 
 namespace {
       * @returns allocated decompression buffer
       * @see DestroyDecompressionBuffer()
       */
-     buffer_t Sample::CreateDecompressionBuffer(unsigned long MaxReadSize) {
+     buffer_t Sample::CreateDecompressionBuffer(file_offset_t MaxReadSize) {
          buffer_t result;
          const double worstCaseHeaderOverhead =
                  (256.0 /*frame size*/ + 12.0 /*header*/ + 2.0 /*compression type flag (stereo)*/) / 256.0;
-         result.Size              = (unsigned long) (double(MaxReadSize) * 3.0 /*(24 Bit)*/ * 2.0 /*stereo*/ * worstCaseHeaderOverhead);
+         result.Size              = (file_offset_t) (double(MaxReadSize) * 3.0 /*(24 Bit)*/ * 2.0 /*stereo*/ * worstCaseHeaderOverhead);
          result.pStart            = new int8_t[result.Size];
          result.NullExtensionSize = 0;
          return result;
-Line 1708 
 namespace {
+Line 1682 
 namespace {
          //NOTE: copy code copied from assignment constructor above, see comment there as well
          *this = *orig; // default memberwise shallow copy of all parameters
+         // restore members that shall not be altered
          pParentList = p; // restore the chunk pointer
+         pRegion = pOriginalRegion;
-         // only take the raw sample reference & parent region reference if the
+         // only take the raw sample reference reference if the
          // two DimensionRegion objects are part of the same file
          if (pOriginalRegion->GetParent()->GetParent() != orig->pRegion->GetParent()->GetParent()) {
-             pRegion = pOriginalRegion;
              pSample = pOriginalSample;
          }
-Line 1749 
 namespace {
+Line 1725 
 namespace {
       *
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
       */
-     void DimensionRegion::UpdateChunks() {
+     void DimensionRegion::UpdateChunks(progress_t* pProgress) {
          // first update base class's chunk
-         DLS::Sampler::UpdateChunks();
+         DLS::Sampler::UpdateChunks(pProgress);
          RIFF::Chunk* wsmp = pParentList->GetSubChunk(CHUNK_ID_WSMP);
          uint8_t* pData = (uint8_t*) wsmp->LoadChunkData();
-Line 3023 
 namespace {
+Line 3001 
 namespace {
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
       *
+      * @param pProgress - callback function for progress notification
       * @throws gig::Exception if samples cannot be dereferenced
       */
-     void Region::UpdateChunks() {
+     void Region::UpdateChunks(progress_t* pProgress) {
          // in the gig format we don't care about the Region's sample reference
          // but we still have to provide some existing one to not corrupt the
          // file, so to avoid the latter we simply always assign the sample of
-Line 3033 
 namespace {
+Line 3012 
 namespace {
          pSample = pDimensionRegions[0]->pSample;
          // first update base class's chunks
-         DLS::Region::UpdateChunks();
+         DLS::Region::UpdateChunks(pProgress);
          // update dimension region's chunks
          for (int i = 0; i < DimensionRegions; i++) {
-             pDimensionRegions[i]->UpdateChunks();
+             pDimensionRegions[i]->UpdateChunks(pProgress);
          }
          File* pFile = (File*) GetParent()->GetParent();
-Line 3053 
 namespace {
+Line 3032 
 namespace {
              memset(_3lnk->LoadChunkData(), 0, _3lnkChunkSize);
              // move 3prg to last position
-             pCkRegion->MoveSubChunk(pCkRegion->GetSubList(LIST_TYPE_3PRG), 0);
+             pCkRegion->MoveSubChunk(pCkRegion->GetSubList(LIST_TYPE_3PRG), (RIFF::Chunk*)NULL);
          }
          // update dimension definitions in '3lnk' chunk
-Line 3199 
 namespace {
+Line 3178 
 namespace {
       *                        dimension bits limit is violated
       */
      void Region::AddDimension(dimension_def_t* pDimDef) {
+         // some initial sanity checks of the given dimension definition
+         if (pDimDef->zones < 2)
+             throw gig::Exception("Could not add new dimension, amount of requested zones must always be at least two");
+         if (pDimDef->bits < 1)
+             throw gig::Exception("Could not add new dimension, amount of requested requested zone bits must always be at least one");
+         if (pDimDef->dimension == dimension_samplechannel) {
+             if (pDimDef->zones != 2)
+                 throw gig::Exception("Could not add new 'sample channel' dimensions, the requested amount of zones must always be 2 for this dimension type");
+             if (pDimDef->bits != 1)
+                 throw gig::Exception("Could not add new 'sample channel' dimensions, the requested amount of zone bits must always be 1 for this dimension type");
+         }
          // check if max. amount of dimensions reached
          File* file = (File*) GetParent()->GetParent();
          const int iMaxDimensions = (file->pVersion && file->pVersion->major == 3) ? 8 : 5;
-Line 3374 
 namespace {
+Line 3365 
 namespace {
          if (pDimDef->dimension == dimension_layer) Layers = 1;
      }
+     /** @brief Delete one split zone of a dimension (decrement zone amount).
+      *
+      * Instead of deleting an entire dimensions, this method will only delete
+      * one particular split zone given by @a zone of the Region's dimension
+      * given by @a type. So this method will simply decrement the amount of
+      * zones by one of the dimension in question. To be able to do that, the
+      * respective dimension must exist on this Region and it must have at least
+      * 3 zones. All DimensionRegion objects associated with the zone will be
+      * deleted.
+      *
+      * @param type - identifies the dimension where a zone shall be deleted
+      * @param zone - index of the dimension split zone that shall be deleted
+      * @throws gig::Exception if requested zone could not be deleted
+      */
+     void Region::DeleteDimensionZone(dimension_t type, int zone) {
+         dimension_def_t* oldDef = GetDimensionDefinition(type);
+         if (!oldDef)
+             throw gig::Exception("Could not delete dimension zone, no such dimension of given type");
+         if (oldDef->zones <= 2)
+             throw gig::Exception("Could not delete dimension zone, because it would end up with only one zone.");
+         if (zone < 0 || zone >= oldDef->zones)
+             throw gig::Exception("Could not delete dimension zone, requested zone index out of bounds.");
+         const int newZoneSize = oldDef->zones - 1;
+         // create a temporary Region which just acts as a temporary copy
+         // container and will be deleted at the end of this function and will
+         // also not be visible through the API during this process
+         gig::Region* tempRgn = NULL;
+         {
+             // adding these temporary chunks is probably not even necessary
+             Instrument* instr = static_cast<Instrument*>(GetParent());
+             RIFF::List* pCkInstrument = instr->pCkInstrument;
+             RIFF::List* lrgn = pCkInstrument->GetSubList(LIST_TYPE_LRGN);
+             if (!lrgn)  lrgn = pCkInstrument->AddSubList(LIST_TYPE_LRGN);
+             RIFF::List* rgn = lrgn->AddSubList(LIST_TYPE_RGN);
+             tempRgn = new Region(instr, rgn);
+         }
+         // copy this region's dimensions (with already the dimension split size
+         // requested by the arguments of this method call) to the temporary
+         // region, and don't use Region::CopyAssign() here for this task, since
+         // it would also alter fast lookup helper variables here and there
+         dimension_def_t newDef;
+         for (int i = 0; i < Dimensions; ++i) {
+             dimension_def_t def = pDimensionDefinitions[i]; // copy, don't reference
+             // is this the dimension requested by the method arguments? ...
+             if (def.dimension == type) { // ... if yes, decrement zone amount by one
+                 def.zones = newZoneSize;
+                 if ((1 << (def.bits - 1)) == def.zones) def.bits--;
+                 newDef = def;
+             }
+             tempRgn->AddDimension(&def);
+         }
+         // find the dimension index in the tempRegion which is the dimension
+         // type passed to this method (paranoidly expecting different order)
+         int tempReducedDimensionIndex = -1;
+         for (int d = 0; d < tempRgn->Dimensions; ++d) {
+             if (tempRgn->pDimensionDefinitions[d].dimension == type) {
+                 tempReducedDimensionIndex = d;
+                 break;
+             }
+         }
+         // copy dimension regions from this region to the temporary region
+         for (int iDst = 0; iDst < 256; ++iDst) {
+             DimensionRegion* dstDimRgn = tempRgn->pDimensionRegions[iDst];
+             if (!dstDimRgn) continue;
+             std::map<dimension_t,int> dimCase;
+             bool isValidZone = true;
+             for (int d = 0, baseBits = 0; d < tempRgn->Dimensions; ++d) {
+                 const int dstBits = tempRgn->pDimensionDefinitions[d].bits;
+                 dimCase[tempRgn->pDimensionDefinitions[d].dimension] =
+                     (iDst >> baseBits) & ((1 << dstBits) - 1);
+                 baseBits += dstBits;
+                 // there are also DimensionRegion objects of unused zones, skip them
+                 if (dimCase[tempRgn->pDimensionDefinitions[d].dimension] >= tempRgn->pDimensionDefinitions[d].zones) {
+                     isValidZone = false;
+                     break;
+                 }
+             }
+             if (!isValidZone) continue;
+             // a bit paranoid: cope with the chance that the dimensions would
+             // have different order in source and destination regions
+             const bool isLastZone = (dimCase[type] == newZoneSize - 1);
+             if (dimCase[type] >= zone) dimCase[type]++;
+             DimensionRegion* srcDimRgn = GetDimensionRegionByBit(dimCase);
+             dstDimRgn->CopyAssign(srcDimRgn);
+             // if this is the upper most zone of the dimension passed to this
+             // method, then correct (raise) its upper limit to 127
+             if (newDef.split_type == split_type_normal && isLastZone)
+                 dstDimRgn->DimensionUpperLimits[tempReducedDimensionIndex] = 127;
+         }
+         // now tempRegion's dimensions and DimensionRegions basically reflect
+         // what we wanted to get for this actual Region here, so we now just
+         // delete and recreate the dimension in question with the new amount
+         // zones and then copy back from tempRegion
+         DeleteDimension(oldDef);
+         AddDimension(&newDef);
+         for (int iSrc = 0; iSrc < 256; ++iSrc) {
+             DimensionRegion* srcDimRgn = tempRgn->pDimensionRegions[iSrc];
+             if (!srcDimRgn) continue;
+             std::map<dimension_t,int> dimCase;
+             for (int d = 0, baseBits = 0; d < tempRgn->Dimensions; ++d) {
+                 const int srcBits = tempRgn->pDimensionDefinitions[d].bits;
+                 dimCase[tempRgn->pDimensionDefinitions[d].dimension] =
+                     (iSrc >> baseBits) & ((1 << srcBits) - 1);
+                 baseBits += srcBits;
+             }
+             // a bit paranoid: cope with the chance that the dimensions would
+             // have different order in source and destination regions
+             DimensionRegion* dstDimRgn = GetDimensionRegionByBit(dimCase);
+             if (!dstDimRgn) continue;
+             dstDimRgn->CopyAssign(srcDimRgn);
+         }
+         // delete temporary region
+         delete tempRgn;
+         UpdateVelocityTable();
+     }
+     /** @brief Divide split zone of a dimension in two (increment zone amount).
+      *
+      * This will increment the amount of zones for the dimension (given by
+      * @a type) by one. It will do so by dividing the zone (given by @a zone)
+      * in the middle of its zone range in two. So the two zones resulting from
+      * the zone being splitted, will be an equivalent copy regarding all their
+      * articulation informations and sample reference. The two zones will only
+      * differ in their zone's upper limit
+      * (DimensionRegion::DimensionUpperLimits).
+      *
+      * @param type - identifies the dimension where a zone shall be splitted
+      * @param zone - index of the dimension split zone that shall be splitted
+      * @throws gig::Exception if requested zone could not be splitted
+      */
+     void Region::SplitDimensionZone(dimension_t type, int zone) {
+         dimension_def_t* oldDef = GetDimensionDefinition(type);
+         if (!oldDef)
+             throw gig::Exception("Could not split dimension zone, no such dimension of given type");
+         if (zone < 0 || zone >= oldDef->zones)
+             throw gig::Exception("Could not split dimension zone, requested zone index out of bounds.");
+         const int newZoneSize = oldDef->zones + 1;
+         // create a temporary Region which just acts as a temporary copy
+         // container and will be deleted at the end of this function and will
+         // also not be visible through the API during this process
+         gig::Region* tempRgn = NULL;
+         {
+             // adding these temporary chunks is probably not even necessary
+             Instrument* instr = static_cast<Instrument*>(GetParent());
+             RIFF::List* pCkInstrument = instr->pCkInstrument;
+             RIFF::List* lrgn = pCkInstrument->GetSubList(LIST_TYPE_LRGN);
+             if (!lrgn)  lrgn = pCkInstrument->AddSubList(LIST_TYPE_LRGN);
+             RIFF::List* rgn = lrgn->AddSubList(LIST_TYPE_RGN);
+             tempRgn = new Region(instr, rgn);
+         }
+         // copy this region's dimensions (with already the dimension split size
+         // requested by the arguments of this method call) to the temporary
+         // region, and don't use Region::CopyAssign() here for this task, since
+         // it would also alter fast lookup helper variables here and there
+         dimension_def_t newDef;
+         for (int i = 0; i < Dimensions; ++i) {
+             dimension_def_t def = pDimensionDefinitions[i]; // copy, don't reference
+             // is this the dimension requested by the method arguments? ...
+             if (def.dimension == type) { // ... if yes, increment zone amount by one
+                 def.zones = newZoneSize;
+                 if ((1 << oldDef->bits) < newZoneSize) def.bits++;
+                 newDef = def;
+             }
+             tempRgn->AddDimension(&def);
+         }
+         // find the dimension index in the tempRegion which is the dimension
+         // type passed to this method (paranoidly expecting different order)
+         int tempIncreasedDimensionIndex = -1;
+         for (int d = 0; d < tempRgn->Dimensions; ++d) {
+             if (tempRgn->pDimensionDefinitions[d].dimension == type) {
+                 tempIncreasedDimensionIndex = d;
+                 break;
+             }
+         }
+         // copy dimension regions from this region to the temporary region
+         for (int iSrc = 0; iSrc < 256; ++iSrc) {
+             DimensionRegion* srcDimRgn = pDimensionRegions[iSrc];
+             if (!srcDimRgn) continue;
+             std::map<dimension_t,int> dimCase;
+             bool isValidZone = true;
+             for (int d = 0, baseBits = 0; d < Dimensions; ++d) {
+                 const int srcBits = pDimensionDefinitions[d].bits;
+                 dimCase[pDimensionDefinitions[d].dimension] =
+                     (iSrc >> baseBits) & ((1 << srcBits) - 1);
+                 // there are also DimensionRegion objects for unused zones, skip them
+                 if (dimCase[pDimensionDefinitions[d].dimension] >= pDimensionDefinitions[d].zones) {
+                     isValidZone = false;
+                     break;
+                 }
+                 baseBits += srcBits;
+             }
+             if (!isValidZone) continue;
+             // a bit paranoid: cope with the chance that the dimensions would
+             // have different order in source and destination regions
+             if (dimCase[type] > zone) dimCase[type]++;
+             DimensionRegion* dstDimRgn = tempRgn->GetDimensionRegionByBit(dimCase);
+             dstDimRgn->CopyAssign(srcDimRgn);
+             // if this is the requested zone to be splitted, then also copy
+             // the source DimensionRegion to the newly created target zone
+             // and set the old zones upper limit lower
+             if (dimCase[type] == zone) {
+                 // lower old zones upper limit
+                 if (newDef.split_type == split_type_normal) {
+                     const int high =
+                         dstDimRgn->DimensionUpperLimits[tempIncreasedDimensionIndex];
+                     int low = 0;
+                     if (zone > 0) {
+                         std::map<dimension_t,int> lowerCase = dimCase;
+                         lowerCase[type]--;
+                         DimensionRegion* dstDimRgnLow = tempRgn->GetDimensionRegionByBit(lowerCase);
+                         low = dstDimRgnLow->DimensionUpperLimits[tempIncreasedDimensionIndex];
+                     }
+                     dstDimRgn->DimensionUpperLimits[tempIncreasedDimensionIndex] = low + (high - low) / 2;
+                 }
+                 // fill the newly created zone of the divided zone as well
+                 dimCase[type]++;
+                 dstDimRgn = tempRgn->GetDimensionRegionByBit(dimCase);
+                 dstDimRgn->CopyAssign(srcDimRgn);
+             }
+         }
+         // now tempRegion's dimensions and DimensionRegions basically reflect
+         // what we wanted to get for this actual Region here, so we now just
+         // delete and recreate the dimension in question with the new amount
+         // zones and then copy back from tempRegion
+         DeleteDimension(oldDef);
+         AddDimension(&newDef);
+         for (int iSrc = 0; iSrc < 256; ++iSrc) {
+             DimensionRegion* srcDimRgn = tempRgn->pDimensionRegions[iSrc];
+             if (!srcDimRgn) continue;
+             std::map<dimension_t,int> dimCase;
+             for (int d = 0, baseBits = 0; d < tempRgn->Dimensions; ++d) {
+                 const int srcBits = tempRgn->pDimensionDefinitions[d].bits;
+                 dimCase[tempRgn->pDimensionDefinitions[d].dimension] =
+                     (iSrc >> baseBits) & ((1 << srcBits) - 1);
+                 baseBits += srcBits;
+             }
+             // a bit paranoid: cope with the chance that the dimensions would
+             // have different order in source and destination regions
+             DimensionRegion* dstDimRgn = GetDimensionRegionByBit(dimCase);
+             if (!dstDimRgn) continue;
+             dstDimRgn->CopyAssign(srcDimRgn);
+         }
+         // delete temporary region
+         delete tempRgn;
+         UpdateVelocityTable();
+     }
+     /** @brief Change type of an existing dimension.
+      *
+      * Alters the dimension type of a dimension already existing on this
+      * region. If there is currently no dimension on this Region with type
+      * @a oldType, then this call with throw an Exception. Likewise there are
+      * cases where the requested dimension type cannot be performed. For example
+      * if the new dimension type shall be gig::dimension_samplechannel, and the
+      * current dimension has more than 2 zones. In such cases an Exception is
+      * thrown as well.
+      *
+      * @param oldType - identifies the existing dimension to be changed
+      * @param newType - to which dimension type it should be changed to
+      * @throws gig::Exception if requested change cannot be performed
+      */
+     void Region::SetDimensionType(dimension_t oldType, dimension_t newType) {
+         if (oldType == newType) return;
+         dimension_def_t* def = GetDimensionDefinition(oldType);
+         if (!def)
+             throw gig::Exception("No dimension with provided old dimension type exists on this region");
+         if (newType == dimension_samplechannel && def->zones != 2)
+             throw gig::Exception("Cannot change to dimension type 'sample channel', because existing dimension does not have 2 zones");
+         if (GetDimensionDefinition(newType))
+             throw gig::Exception("There is already a dimension with requested new dimension type on this region");
+         def->dimension  = newType;
+         def->split_type = __resolveSplitType(newType);
+     }
+     DimensionRegion* Region::GetDimensionRegionByBit(const std::map<dimension_t,int>& DimCase) {
+         uint8_t bits[8] = {};
+         for (std::map<dimension_t,int>::const_iterator it = DimCase.begin();
+              it != DimCase.end(); ++it)
+         {
+             for (int d = 0; d < Dimensions; ++d) {
+                 if (pDimensionDefinitions[d].dimension == it->first) {
+                     bits[d] = it->second;
+                     goto nextDimCaseSlice;
+                 }
+             }
+             assert(false); // do crash ... too harsh maybe ? ignore it instead ?
+             nextDimCaseSlice:
+             ; // noop
+         }
+         return GetDimensionRegionByBit(bits);
+     }
+     /**
+      * Searches in the current Region for a dimension of the given dimension
+      * type and returns the precise configuration of that dimension in this
+      * Region.
+      *
+      * @param type - dimension type of the sought dimension
+      * @returns dimension definition or NULL if there is no dimension with
+      *          sought type in this Region.
+      */
+     dimension_def_t* Region::GetDimensionDefinition(dimension_t type) {
+         for (int i = 0; i < Dimensions; ++i)
+             if (pDimensionDefinitions[i].dimension == type)
+                 return &pDimensionDefinitions[i];
+         return NULL;
+     }
      Region::~Region() {
          for (int i = 0; i < 256; i++) {
              if (pDimensionRegions[i]) delete pDimensionRegions[i];
-Line 3431 
 namespace {
+Line 3746 
 namespace {
              }
              bitpos += pDimensionDefinitions[i].bits;
          }
-         DimensionRegion* dimreg = pDimensionRegions[dimregidx];
+         DimensionRegion* dimreg = pDimensionRegions[dimregidx & 255];
+         if (!dimreg) return NULL;
          if (veldim != -1) {
              // (dimreg is now the dimension region for the lowest velocity)
              if (dimreg->VelocityTable) // custom defined zone ranges
-                 bits = dimreg->VelocityTable[DimValues[veldim]];
+                 bits = dimreg->VelocityTable[DimValues[veldim] & 127];
              else // normal split type
-                 bits = uint8_t(DimValues[veldim] / pDimensionDefinitions[veldim].zone_size);
+                 bits = uint8_t((DimValues[veldim] & 127) / pDimensionDefinitions[veldim].zone_size);
-             dimregidx |= bits << velbitpos;
+             const uint8_t limiter_mask = (1 << pDimensionDefinitions[veldim].bits) - 1;
-             dimreg = pDimensionRegions[dimregidx];
+             dimregidx |= (bits & limiter_mask) << velbitpos;
+             dimreg = pDimensionRegions[dimregidx & 255];
          }
          return dimreg;
      }
+     int Region::GetDimensionRegionIndexByValue(const uint DimValues[8]) {
+         uint8_t bits;
+         int veldim = -1;
+         int velbitpos;
+         int bitpos = 0;
+         int dimregidx = 0;
+         for (uint i = 0; i < Dimensions; i++) {
+             if (pDimensionDefinitions[i].dimension == dimension_velocity) {
+                 // the velocity dimension must be handled after the other dimensions
+                 veldim = i;
+                 velbitpos = bitpos;
+             } else {
+                 switch (pDimensionDefinitions[i].split_type) {
+                     case split_type_normal:
+                         if (pDimensionRegions[0]->DimensionUpperLimits[i]) {
+                             // gig3: all normal dimensions (not just the velocity dimension) have custom zone ranges
+                             for (bits = 0 ; bits < pDimensionDefinitions[i].zones ; bits++) {
+                                 if (DimValues[i] <= pDimensionRegions[bits << bitpos]->DimensionUpperLimits[i]) break;
+                             }
+                         } else {
+                             // gig2: evenly sized zones
+                             bits = uint8_t(DimValues[i] / pDimensionDefinitions[i].zone_size);
+                         }
+                         break;
+                     case split_type_bit: // the value is already the sought dimension bit number
+                         const uint8_t limiter_mask = (0xff << pDimensionDefinitions[i].bits) ^ 0xff;
+                         bits = DimValues[i] & limiter_mask; // just make sure the value doesn't use more bits than allowed
+                         break;
+                 }
+                 dimregidx |= bits << bitpos;
+             }
+             bitpos += pDimensionDefinitions[i].bits;
+         }
+         dimregidx &= 255;
+         DimensionRegion* dimreg = pDimensionRegions[dimregidx];
+         if (!dimreg) return -1;
+         if (veldim != -1) {
+             // (dimreg is now the dimension region for the lowest velocity)
+             if (dimreg->VelocityTable) // custom defined zone ranges
+                 bits = dimreg->VelocityTable[DimValues[veldim] & 127];
+             else // normal split type
+                 bits = uint8_t((DimValues[veldim] & 127) / pDimensionDefinitions[veldim].zone_size);
+             const uint8_t limiter_mask = (1 << pDimensionDefinitions[veldim].bits) - 1;
+             dimregidx |= (bits & limiter_mask) << velbitpos;
+             dimregidx &= 255;
+         }
+         return dimregidx;
+     }
      /**
       * Returns the appropriate DimensionRegion for the given dimension bit
       * numbers (zone index). You usually use <i>GetDimensionRegionByValue</i>
-Line 3483 
 namespace {
+Line 3850 
 namespace {
          if ((int32_t)WavePoolTableIndex == -1) return NULL;
          File* file = (File*) GetParent()->GetParent();
          if (!file->pWavePoolTable) return NULL;
-         unsigned long soughtoffset = file->pWavePoolTable[WavePoolTableIndex];
+         if (file->HasMonolithicLargeFilePolicy()) {
-         unsigned long soughtfileno = file->pWavePoolTableHi[WavePoolTableIndex];
+             uint64_t soughtoffset =
-         Sample* sample = file->GetFirstSample(pProgress);
+                 uint64_t(file->pWavePoolTable[WavePoolTableIndex]) |
-         while (sample) {
+                 uint64_t(file->pWavePoolTableHi[WavePoolTableIndex]) << 32;
-             if (sample->ulWavePoolOffset == soughtoffset &&
+             Sample* sample = file->GetFirstSample(pProgress);
-                 sample->FileNo == soughtfileno) return static_cast<gig::Sample*>(sample);
+             while (sample) {
-             sample = file->GetNextSample();
+                 if (sample->ullWavePoolOffset == soughtoffset)
+                     return static_cast<gig::Sample*>(sample);
+                 sample = file->GetNextSample();
+             }
+         } else {
+             file_offset_t soughtoffset = file->pWavePoolTable[WavePoolTableIndex];
+             file_offset_t soughtfileno = file->pWavePoolTableHi[WavePoolTableIndex];
+             Sample* sample = file->GetFirstSample(pProgress);
+             while (sample) {
+                 if (sample->ullWavePoolOffset == soughtoffset &&
+                     sample->FileNo == soughtfileno) return static_cast<gig::Sample*>(sample);
+                 sample = file->GetNextSample();
+             }
          }
          return NULL;
      }
-Line 3711 
 namespace {
+Line 4090 
 namespace {
          }
      }
+ // *************** Script ***************
+ // *
+     Script::Script(ScriptGroup* group, RIFF::Chunk* ckScri) {
+         pGroup = group;
+         pChunk = ckScri;
+         if (ckScri) { // object is loaded from file ...
+             // read header
+             uint32_t headerSize = ckScri->ReadUint32();
+             Compression = (Compression_t) ckScri->ReadUint32();
+             Encoding    = (Encoding_t) ckScri->ReadUint32();
+             Language    = (Language_t) ckScri->ReadUint32();
+             Bypass      = (Language_t) ckScri->ReadUint32() & 1;
+             crc         = ckScri->ReadUint32();
+             uint32_t nameSize = ckScri->ReadUint32();
+             Name.resize(nameSize, ' ');
+             for (int i = 0; i < nameSize; ++i)
+                 Name[i] = ckScri->ReadUint8();
+             // to handle potential future extensions of the header
+             ckScri->SetPos(sizeof(int32_t) + headerSize);
+             // read actual script data
+             uint32_t scriptSize = ckScri->GetSize() - ckScri->GetPos();
+             data.resize(scriptSize);
+             for (int i = 0; i < scriptSize; ++i)
+                 data[i] = ckScri->ReadUint8();
+         } else { // this is a new script object, so just initialize it as such ...
+             Compression = COMPRESSION_NONE;
+             Encoding = ENCODING_ASCII;
+             Language = LANGUAGE_NKSP;
+             Bypass   = false;
+             crc      = 0;
+             Name     = "Unnamed Script";
+         }
+     }
+     Script::~Script() {
+     }
+     /**
+      * Returns the current script (i.e. as source code) in text format.
+      */
+     String Script::GetScriptAsText() {
+         String s;
+         s.resize(data.size(), ' ');
+         memcpy(&s[0], &data[0], data.size());
+         return s;
+     }
+     /**
+      * Replaces the current script with the new script source code text given
+      * by @a text.
+      *
+      * @param text - new script source code
+      */
+     void Script::SetScriptAsText(const String& text) {
+         data.resize(text.size());
+         memcpy(&data[0], &text[0], text.size());
+     }
+     /**
+      * Apply this script to the respective RIFF chunks. You have to call
+      * File::Save() to make changes persistent.
+      *
+      * Usually there is absolutely no need to call this method explicitly.
+      * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
+      */
+     void Script::UpdateChunks(progress_t* pProgress) {
+         // recalculate CRC32 check sum
+         __resetCRC(crc);
+         __calculateCRC(&data[0], data.size(), crc);
+         __encodeCRC(crc);
+         // make sure chunk exists and has the required size
+         const int chunkSize = 7*sizeof(int32_t) + Name.size() + data.size();
+         if (!pChunk) pChunk = pGroup->pList->AddSubChunk(CHUNK_ID_SCRI, chunkSize);
+         else pChunk->Resize(chunkSize);
+         // fill the chunk data to be written to disk
+         uint8_t* pData = (uint8_t*) pChunk->LoadChunkData();
+         int pos = 0;
+         store32(&pData[pos], 6*sizeof(int32_t) + Name.size()); // total header size
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Compression);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Encoding);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Language);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Bypass ? 1 : 0);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], crc);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Name.size());
+         pos += sizeof(int32_t);
+         for (int i = 0; i < Name.size(); ++i, ++pos)
+             pData[pos] = Name[i];
+         for (int i = 0; i < data.size(); ++i, ++pos)
+             pData[pos] = data[i];
+     }
+     /**
+      * Move this script from its current ScriptGroup to another ScriptGroup
+      * given by @a pGroup.
+      *
+      * @param pGroup - script's new group
+      */
+     void Script::SetGroup(ScriptGroup* pGroup) {
+         if (this->pGroup == pGroup) return;
+         if (pChunk)
+             pChunk->GetParent()->MoveSubChunk(pChunk, pGroup->pList);
+         this->pGroup = pGroup;
+     }
+     /**
+      * Returns the script group this script currently belongs to. Each script
+      * is a member of exactly one ScriptGroup.
+      *
+      * @returns current script group
+      */
+     ScriptGroup* Script::GetGroup() const {
+         return pGroup;
+     }
+     void Script::RemoveAllScriptReferences() {
+         File* pFile = pGroup->pFile;
+         for (int i = 0; pFile->GetInstrument(i); ++i) {
+             Instrument* instr = pFile->GetInstrument(i);
+             instr->RemoveScript(this);
+         }
+     }
+ // *************** ScriptGroup ***************
+ // *
+     ScriptGroup::ScriptGroup(File* file, RIFF::List* lstRTIS) {
+         pFile = file;
+         pList = lstRTIS;
+         pScripts = NULL;
+         if (lstRTIS) {
+             RIFF::Chunk* ckName = lstRTIS->GetSubChunk(CHUNK_ID_LSNM);
+             ::LoadString(ckName, Name);
+         } else {
+             Name = "Default Group";
+         }
+     }
+     ScriptGroup::~ScriptGroup() {
+         if (pScripts) {
+             std::list<Script*>::iterator iter = pScripts->begin();
+             std::list<Script*>::iterator end  = pScripts->end();
+             while (iter != end) {
+                 delete *iter;
+                 ++iter;
+             }
+             delete pScripts;
+         }
+     }
+     /**
+      * Apply this script group to the respective RIFF chunks. You have to call
+      * File::Save() to make changes persistent.
+      *
+      * Usually there is absolutely no need to call this method explicitly.
+      * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
+      */
+     void ScriptGroup::UpdateChunks(progress_t* pProgress) {
+         if (pScripts) {
+             if (!pList)
+                 pList = pFile->pRIFF->GetSubList(LIST_TYPE_3LS)->AddSubList(LIST_TYPE_RTIS);
+             // now store the name of this group as <LSNM> chunk as subchunk of the <RTIS> list chunk
+             ::SaveString(CHUNK_ID_LSNM, NULL, pList, Name, String("Unnamed Group"), true, 64);
+             for (std::list<Script*>::iterator it = pScripts->begin();
+                  it != pScripts->end(); ++it)
+             {
+                 (*it)->UpdateChunks(pProgress);
+             }
+         }
+     }
+     /** @brief Get instrument script.
+      *
+      * Returns the real-time instrument script with the given index.
+      *
+      * @param index - number of the sought script (0..n)
+      * @returns sought script or NULL if there's no such script
+      */
+     Script* ScriptGroup::GetScript(uint index) {
+         if (!pScripts) LoadScripts();
+         std::list<Script*>::iterator it = pScripts->begin();
+         for (uint i = 0; it != pScripts->end(); ++i, ++it)
+             if (i == index) return *it;
+         return NULL;
+     }
+     /** @brief Add new instrument script.
+      *
+      * Adds a new real-time instrument script to the file. The script is not
+      * actually used / executed unless it is referenced by an instrument to be
+      * used. This is similar to samples, which you can add to a file, without
+      * an instrument necessarily actually using it.
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @return new empty script object
+      */
+     Script* ScriptGroup::AddScript() {
+         if (!pScripts) LoadScripts();
+         Script* pScript = new Script(this, NULL);
+         pScripts->push_back(pScript);
+         return pScript;
+     }
+     /** @brief Delete an instrument script.
+      *
+      * This will delete the given real-time instrument script. References of
+      * instruments that are using that script will be removed accordingly.
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @param pScript - script to delete
+      * @throws gig::Exception if given script could not be found
+      */
+     void ScriptGroup::DeleteScript(Script* pScript) {
+         if (!pScripts) LoadScripts();
+         std::list<Script*>::iterator iter =
+             find(pScripts->begin(), pScripts->end(), pScript);
+         if (iter == pScripts->end())
+             throw gig::Exception("Could not delete script, could not find given script");
+         pScripts->erase(iter);
+         pScript->RemoveAllScriptReferences();
+         if (pScript->pChunk)
+             pScript->pChunk->GetParent()->DeleteSubChunk(pScript->pChunk);
+         delete pScript;
+     }
+     void ScriptGroup::LoadScripts() {
+         if (pScripts) return;
+         pScripts = new std::list<Script*>;
+         if (!pList) return;
+         for (RIFF::Chunk* ck = pList->GetFirstSubChunk(); ck;
+              ck = pList->GetNextSubChunk())
+         {
+             if (ck->GetChunkID() == CHUNK_ID_SCRI) {
+                 pScripts->push_back(new Script(this, ck));
+             }
+         }
+     }
  // *************** Instrument ***************
  // *
-Line 3733 
 namespace {
+Line 4365 
 namespace {
          DimensionKeyRange.high = 0;
          pMidiRules = new MidiRule*[3];
          pMidiRules[0] = NULL;
+         pScriptRefs = NULL;
          // Loading
          RIFF::List* lart = insList->GetSubList(LIST_TYPE_LART);
-Line 3793 
 namespace {
+Line 4426 
 namespace {
              }
          }
+         // own gig format extensions
+         RIFF::List* lst3LS = insList->GetSubList(LIST_TYPE_3LS);
+         if (lst3LS) {
+             RIFF::Chunk* ckSCSL = lst3LS->GetSubChunk(CHUNK_ID_SCSL);
+             if (ckSCSL) {
+                 int headerSize = ckSCSL->ReadUint32();
+                 int slotCount  = ckSCSL->ReadUint32();
+                 if (slotCount) {
+                     int slotSize  = ckSCSL->ReadUint32();
+                     ckSCSL->SetPos(headerSize); // in case of future header extensions
+                     int unknownSpace = slotSize - 2*sizeof(uint32_t); // in case of future slot extensions
+                     for (int i = 0; i < slotCount; ++i) {
+                         _ScriptPooolEntry e;
+                         e.fileOffset = ckSCSL->ReadUint32();
+                         e.bypass     = ckSCSL->ReadUint32() & 1;
+                         if (unknownSpace) ckSCSL->SetPos(unknownSpace, RIFF::stream_curpos); // in case of future extensions
+                         scriptPoolFileOffsets.push_back(e);
+                     }
+                 }
+             }
+         }
          __notify_progress(pProgress, 1.0f); // notify done
      }
-Line 3813 
 namespace {
+Line 4468 
 namespace {
              delete pMidiRules[i];
          }
          delete[] pMidiRules;
+         if (pScriptRefs) delete pScriptRefs;
      }
      /**
-Line 3822 
 namespace {
+Line 4478 
 namespace {
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
       *
+      * @param pProgress - callback function for progress notification
       * @throws gig::Exception if samples cannot be dereferenced
       */
-     void Instrument::UpdateChunks() {
+     void Instrument::UpdateChunks(progress_t* pProgress) {
          // first update base classes' chunks
-         DLS::Instrument::UpdateChunks();
+         DLS::Instrument::UpdateChunks(pProgress);
          // update Regions' chunks
          {
              RegionList::iterator iter = pRegions->begin();
              RegionList::iterator end  = pRegions->end();
              for (; iter != end; ++iter)
-                 (*iter)->UpdateChunks();
+                 (*iter)->UpdateChunks(pProgress);
          }
          // make sure 'lart' RIFF list chunk exists
-Line 3868 
 namespace {
+Line 4525 
 namespace {
                  pMidiRules[i]->UpdateChunks(pData);
              }
          }
+         // own gig format extensions
+        if (ScriptSlotCount()) {
+            // make sure we have converted the original loaded script file
+            // offsets into valid Script object pointers
+            LoadScripts();
+            RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
+            if (!lst3LS) lst3LS = pCkInstrument->AddSubList(LIST_TYPE_3LS);
+            const int slotCount = pScriptRefs->size();
+            const int headerSize = 3 * sizeof(uint32_t);
+            const int slotSize  = 2 * sizeof(uint32_t);
+            const int totalChunkSize = headerSize + slotCount * slotSize;
+            RIFF::Chunk* ckSCSL = lst3LS->GetSubChunk(CHUNK_ID_SCSL);
+            if (!ckSCSL) ckSCSL = lst3LS->AddSubChunk(CHUNK_ID_SCSL, totalChunkSize);
+            else ckSCSL->Resize(totalChunkSize);
+            uint8_t* pData = (uint8_t*) ckSCSL->LoadChunkData();
+            int pos = 0;
+            store32(&pData[pos], headerSize);
+            pos += sizeof(uint32_t);
+            store32(&pData[pos], slotCount);
+            pos += sizeof(uint32_t);
+            store32(&pData[pos], slotSize);
+            pos += sizeof(uint32_t);
+            for (int i = 0; i < slotCount; ++i) {
+                // arbitrary value, the actual file offset will be updated in
+                // UpdateScriptFileOffsets() after the file has been resized
+                int bogusFileOffset = 0;
+                store32(&pData[pos], bogusFileOffset);
+                pos += sizeof(uint32_t);
+                store32(&pData[pos], (*pScriptRefs)[i].bypass ? 1 : 0);
+                pos += sizeof(uint32_t);
+            }
+        } else {
+            // no script slots, so get rid of any LS custom RIFF chunks (if any)
+            RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
+            if (lst3LS) pCkInstrument->DeleteSubChunk(lst3LS);
+        }
+     }
+     void Instrument::UpdateScriptFileOffsets() {
+        // own gig format extensions
+        if (pScriptRefs && pScriptRefs->size() > 0) {
+            RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
+            RIFF::Chunk* ckSCSL = lst3LS->GetSubChunk(CHUNK_ID_SCSL);
+            const int slotCount = pScriptRefs->size();
+            const int headerSize = 3 * sizeof(uint32_t);
+            ckSCSL->SetPos(headerSize);
+            for (int i = 0; i < slotCount; ++i) {
+                uint32_t fileOffset =
+                     (*pScriptRefs)[i].script->pChunk->GetFilePos() -
+                     (*pScriptRefs)[i].script->pChunk->GetPos() -
+                     CHUNK_HEADER_SIZE(ckSCSL->GetFile()->GetFileOffsetSize());
+                ckSCSL->WriteUint32(&fileOffset);
+                // jump over flags entry (containing the bypass flag)
+                ckSCSL->SetPos(sizeof(uint32_t), RIFF::stream_curpos);
+            }
+        }
      }
      /**
-Line 3937 
 namespace {
+Line 4652 
 namespace {
      }
      /**
+      * Move this instrument at the position before @arg dst.
+      *
+      * This method can be used to reorder the sequence of instruments in a
+      * .gig file. This might be helpful especially on large .gig files which
+      * contain a large number of instruments within the same .gig file. So
+      * grouping such instruments to similar ones, can help to keep track of them
+      * when working with such complex .gig files.
+      *
+      * When calling this method, this instrument will be removed from in its
+      * current position in the instruments list and moved to the requested
+      * target position provided by @param dst. You may also pass NULL as
+      * argument to this method, in that case this intrument will be moved to the
+      * very end of the .gig file's instrument list.
+      *
+      * You have to call Save() to make the order change persistent to the .gig
+      * file.
+      *
+      * Currently this method is limited to moving the instrument within the same
+      * .gig file. Trying to move it to another .gig file by calling this method
+      * will throw an exception.
+      *
+      * @param dst - destination instrument at which this instrument will be
+      *              moved to, or pass NULL for moving to end of list
+      * @throw gig::Exception if this instrument and target instrument are not
+      *                       part of the same file
+      */
+     void Instrument::MoveTo(Instrument* dst) {
+         if (dst && GetParent() != dst->GetParent())
+             throw Exception(
+                 "gig::Instrument::MoveTo() can only be used for moving within "
+                 "the same gig file."
+             );
+         File* pFile = (File*) GetParent();
+         // move this instrument within the instrument list
+         {
+             File::InstrumentList& list = *pFile->pInstruments;
+             File::InstrumentList::iterator itFrom =
+                 std::find(list.begin(), list.end(), static_cast<DLS::Instrument*>(this));
+             File::InstrumentList::iterator itTo =
+                 std::find(list.begin(), list.end(), static_cast<DLS::Instrument*>(dst));
+             list.splice(itTo, list, itFrom);
+         }
+         // move the instrument's actual list RIFF chunk appropriately
+         RIFF::List* lstCkInstruments = pFile->pRIFF->GetSubList(LIST_TYPE_LINS);
+         lstCkInstruments->MoveSubChunk(
+             this->pCkInstrument,
+             (RIFF::Chunk*) ((dst) ? dst->pCkInstrument : NULL)
+         );
+     }
+     /**
       * Returns a MIDI rule of the instrument.
       *
       * The list of MIDI rules, at least in gig v3, always contains at
-Line 3999 
 namespace {
+Line 4771 
 namespace {
          pMidiRules[i] = 0;
      }
+     void Instrument::LoadScripts() {
+         if (pScriptRefs) return;
+         pScriptRefs = new std::vector<_ScriptPooolRef>;
+         if (scriptPoolFileOffsets.empty()) return;
+         File* pFile = (File*) GetParent();
+         for (uint k = 0; k < scriptPoolFileOffsets.size(); ++k) {
+             uint32_t soughtOffset = scriptPoolFileOffsets[k].fileOffset;
+             for (uint i = 0; pFile->GetScriptGroup(i); ++i) {
+                 ScriptGroup* group = pFile->GetScriptGroup(i);
+                 for (uint s = 0; group->GetScript(s); ++s) {
+                     Script* script = group->GetScript(s);
+                     if (script->pChunk) {
+                         uint32_t offset = script->pChunk->GetFilePos() -
+                                           script->pChunk->GetPos() -
+                                           CHUNK_HEADER_SIZE(script->pChunk->GetFile()->GetFileOffsetSize());
+                         if (offset == soughtOffset)
+                         {
+                             _ScriptPooolRef ref;
+                             ref.script = script;
+                             ref.bypass = scriptPoolFileOffsets[k].bypass;
+                             pScriptRefs->push_back(ref);
+                             break;
+                         }
+                     }
+                 }
+             }
+         }
+         // we don't need that anymore
+         scriptPoolFileOffsets.clear();
+     }
+     /** @brief Get instrument script (gig format extension).
+      *
+      * Returns the real-time instrument script of instrument script slot
+      * @a index.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param index - instrument script slot index
+      * @returns script or NULL if index is out of bounds
+      */
+     Script* Instrument::GetScriptOfSlot(uint index) {
+         LoadScripts();
+         if (index >= pScriptRefs->size()) return NULL;
+         return pScriptRefs->at(index).script;
+     }
+     /** @brief Add new instrument script slot (gig format extension).
+      *
+      * Add the given real-time instrument script reference to this instrument,
+      * which shall be executed by the sampler for for this instrument. The
+      * script will be added to the end of the script list of this instrument.
+      * The positions of the scripts in the Instrument's Script list are
+      * relevant, because they define in which order they shall be executed by
+      * the sampler. For this reason it is also legal to add the same script
+      * twice to an instrument, for example you might have a script called
+      * "MyFilter" which performs an event filter task, and you might have
+      * another script called "MyNoteTrigger" which triggers new notes, then you
+      * might for example have the following list of scripts on the instrument:
+      *
+      * 1. Script "MyFilter"
+      * 2. Script "MyNoteTrigger"
+      * 3. Script "MyFilter"
+      *
+      * Which would make sense, because the 2nd script launched new events, which
+      * you might need to filter as well.
+      *
+      * There are two ways to disable / "bypass" scripts. You can either disable
+      * a script locally for the respective script slot on an instrument (i.e. by
+      * passing @c false to the 2nd argument of this method, or by calling
+      * SetScriptBypassed()). Or you can disable a script globally for all slots
+      * and all instruments by setting Script::Bypass.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param pScript - script that shall be executed for this instrument
+      * @param bypass  - if enabled, the sampler shall skip executing this
+      *                  script (in the respective list position)
+      * @see SetScriptBypassed()
+      */
+     void Instrument::AddScriptSlot(Script* pScript, bool bypass) {
+         LoadScripts();
+         _ScriptPooolRef ref = { pScript, bypass };
+         pScriptRefs->push_back(ref);
+     }
+     /** @brief Flip two script slots with each other (gig format extension).
+      *
+      * Swaps the position of the two given scripts in the Instrument's Script
+      * list. The positions of the scripts in the Instrument's Script list are
+      * relevant, because they define in which order they shall be executed by
+      * the sampler.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param index1 - index of the first script slot to swap
+      * @param index2 - index of the second script slot to swap
+      */
+     void Instrument::SwapScriptSlots(uint index1, uint index2) {
+         LoadScripts();
+         if (index1 >= pScriptRefs->size() || index2 >= pScriptRefs->size())
+             return;
+         _ScriptPooolRef tmp = (*pScriptRefs)[index1];
+         (*pScriptRefs)[index1] = (*pScriptRefs)[index2];
+         (*pScriptRefs)[index2] = tmp;
+     }
+     /** @brief Remove script slot.
+      *
+      * Removes the script slot with the given slot index.
+      *
+      * @param index - index of script slot to remove
+      */
+     void Instrument::RemoveScriptSlot(uint index) {
+         LoadScripts();
+         if (index >= pScriptRefs->size()) return;
+         pScriptRefs->erase( pScriptRefs->begin() + index );
+     }
+     /** @brief Remove reference to given Script (gig format extension).
+      *
+      * This will remove all script slots on the instrument which are referencing
+      * the given script.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param pScript - script reference to remove from this instrument
+      * @see RemoveScriptSlot()
+      */
+     void Instrument::RemoveScript(Script* pScript) {
+         LoadScripts();
+         for (int i = pScriptRefs->size() - 1; i >= 0; --i) {
+             if ((*pScriptRefs)[i].script == pScript) {
+                 pScriptRefs->erase( pScriptRefs->begin() + i );
+             }
+         }
+     }
+     /** @brief Instrument's amount of script slots.
+      *
+      * This method returns the amount of script slots this instrument currently
+      * uses.
+      *
+      * A script slot is a reference of a real-time instrument script to be
+      * executed by the sampler. The scripts will be executed by the sampler in
+      * sequence of the slots. One (same) script may be referenced multiple
+      * times in different slots.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      */
+     uint Instrument::ScriptSlotCount() const {
+         return pScriptRefs ? pScriptRefs->size() : scriptPoolFileOffsets.size();
+     }
+     /** @brief Whether script execution shall be skipped.
+      *
+      * Defines locally for the Script reference slot in the Instrument's Script
+      * list, whether the script shall be skipped by the sampler regarding
+      * execution.
+      *
+      * It is also possible to ignore exeuction of the script globally, for all
+      * slots and for all instruments by setting Script::Bypass.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param index - index of the script slot on this instrument
+      * @see Script::Bypass
+      */
+     bool Instrument::IsScriptSlotBypassed(uint index) {
+         if (index >= ScriptSlotCount()) return false;
+         return pScriptRefs ? pScriptRefs->at(index).bypass
+                            : scriptPoolFileOffsets.at(index).bypass;
+     }
+     /** @brief Defines whether execution shall be skipped.
+      *
+      * You can call this method to define locally whether or whether not the
+      * given script slot shall be executed by the sampler.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param index - script slot index on this instrument
+      * @param bBypass - if true, the script slot will be skipped by the sampler
+      * @see Script::Bypass
+      */
+     void Instrument::SetScriptSlotBypassed(uint index, bool bBypass) {
+         if (index >= ScriptSlotCount()) return;
+         if (pScriptRefs)
+             pScriptRefs->at(index).bypass = bBypass;
+         else
+             scriptPoolFileOffsets.at(index).bypass = bBypass;
+     }
      /**
       * Make a (semi) deep copy of the Instrument object given by @a orig
       * and assign it to this object.
-Line 4032 
 namespace {
+Line 5012 
 namespace {
          PitchbendRange = orig->PitchbendRange;
          PianoReleaseMode = orig->PianoReleaseMode;
          DimensionKeyRange = orig->DimensionKeyRange;
+         scriptPoolFileOffsets = orig->scriptPoolFileOffsets;
+         pScriptRefs = orig->pScriptRefs;
          // free old midi rules
          for (int i = 0 ; pMidiRules[i] ; i++) {
-Line 4086 
 namespace {
+Line 5068 
 namespace {
       *
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
       */
-     void Group::UpdateChunks() {
+     void Group::UpdateChunks(progress_t* pProgress) {
          // make sure <3gri> and <3gnl> list chunks exist
          RIFF::List* _3gri = pFile->pRIFF->GetSubList(LIST_TYPE_3GRI);
          if (!_3gri) {
-Line 4217 
 namespace {
+Line 5201 
 namespace {
          bAutoLoad = true;
          *pVersion = VERSION_3;
          pGroups = NULL;
+         pScriptGroups = NULL;
          pInfo->SetFixedStringLengths(_FileFixedStringLengths);
          pInfo->ArchivalLocation = String(256, ' ');
-Line 4232 
 namespace {
+Line 5217 
 namespace {
      File::File(RIFF::File* pRIFF) : DLS::File(pRIFF) {
          bAutoLoad = true;
          pGroups = NULL;
+         pScriptGroups = NULL;
          pInfo->SetFixedStringLengths(_FileFixedStringLengths);
      }
-Line 4245 
 namespace {
+Line 5231 
 namespace {
              }
              delete pGroups;
          }
+         if (pScriptGroups) {
+             std::list<ScriptGroup*>::iterator iter = pScriptGroups->begin();
+             std::list<ScriptGroup*>::iterator end  = pScriptGroups->end();
+             while (iter != end) {
+                 delete *iter;
+                 ++iter;
+             }
+             delete pScriptGroups;
+         }
      }
      Sample* File::GetFirstSample(progress_t* pProgress) {
-Line 4354 
 namespace {
+Line 5349 
 namespace {
          // check if samples should be loaded from extension files
          int lastFileNo = 0;
-         for (int i = 0 ; i < WavePoolCount ; i++) {
+         if (!HasMonolithicLargeFilePolicy()) {
-             if (pWavePoolTableHi[i] > lastFileNo) lastFileNo = pWavePoolTableHi[i];
+             for (int i = 0 ; i < WavePoolCount ; i++) {
+                 if (pWavePoolTableHi[i] > lastFileNo) lastFileNo = pWavePoolTableHi[i];
+             }
          }
          String name(pRIFF->GetFileName());
          int nameLen = name.length();
-Line 4365 
 namespace {
+Line 5362 
 namespace {
          for (int fileNo = 0 ; ; ) {
              RIFF::List* wvpl = file->GetSubList(LIST_TYPE_WVPL);
              if (wvpl) {
-                 unsigned long wvplFileOffset = wvpl->GetFilePos();
+                 file_offset_t wvplFileOffset = wvpl->GetFilePos();
                  RIFF::List* wave = wvpl->GetFirstSubList();
                  while (wave) {
                      if (wave->GetListType() == LIST_TYPE_WAVE) {
-Line 4373 
 namespace {
+Line 5370 
 namespace {
                          const float subprogress = (float) iSampleIndex / (float) iTotalSamples;
                          __notify_progress(pProgress, subprogress);
-                         unsigned long waveFileOffset = wave->GetFilePos();
+                         file_offset_t waveFileOffset = wave->GetFilePos();
                          pSamples->push_back(new Sample(this, wave, waveFileOffset - wvplFileOffset, fileNo));
                          iSampleIndex++;
-Line 4757 
 namespace {
+Line 5754 
 namespace {
          }
      }
+     /** @brief Get instrument script group (by index).
+      *
+      * Returns the real-time instrument script group with the given index.
+      *
+      * @param index - number of the sought group (0..n)
+      * @returns sought script group or NULL if there's no such group
+      */
+     ScriptGroup* File::GetScriptGroup(uint index) {
+         if (!pScriptGroups) LoadScriptGroups();
+         std::list<ScriptGroup*>::iterator it = pScriptGroups->begin();
+         for (uint i = 0; it != pScriptGroups->end(); ++i, ++it)
+             if (i == index) return *it;
+         return NULL;
+     }
+     /** @brief Get instrument script group (by name).
+      *
+      * Returns the first real-time instrument script group found with the given
+      * group name. Note that group names may not necessarily be unique.
+      *
+      * @param name - name of the sought script group
+      * @returns sought script group or NULL if there's no such group
+      */
+     ScriptGroup* File::GetScriptGroup(const String& name) {
+         if (!pScriptGroups) LoadScriptGroups();
+         std::list<ScriptGroup*>::iterator it = pScriptGroups->begin();
+         for (uint i = 0; it != pScriptGroups->end(); ++i, ++it)
+             if ((*it)->Name == name) return *it;
+         return NULL;
+     }
+     /** @brief Add new instrument script group.
+      *
+      * Adds a new, empty real-time instrument script group to the file.
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @return new empty script group
+      */
+     ScriptGroup* File::AddScriptGroup() {
+         if (!pScriptGroups) LoadScriptGroups();
+         ScriptGroup* pScriptGroup = new ScriptGroup(this, NULL);
+         pScriptGroups->push_back(pScriptGroup);
+         return pScriptGroup;
+     }
+     /** @brief Delete an instrument script group.
+      *
+      * This will delete the given real-time instrument script group and all its
+      * instrument scripts it contains. References inside instruments that are
+      * using the deleted scripts will be removed from the respective instruments
+      * accordingly.
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @param pScriptGroup - script group to delete
+      * @throws gig::Exception if given script group could not be found
+      */
+     void File::DeleteScriptGroup(ScriptGroup* pScriptGroup) {
+         if (!pScriptGroups) LoadScriptGroups();
+         std::list<ScriptGroup*>::iterator iter =
+             find(pScriptGroups->begin(), pScriptGroups->end(), pScriptGroup);
+         if (iter == pScriptGroups->end())
+             throw gig::Exception("Could not delete script group, could not find given script group");
+         pScriptGroups->erase(iter);
+         for (int i = 0; pScriptGroup->GetScript(i); ++i)
+             pScriptGroup->DeleteScript(pScriptGroup->GetScript(i));
+         if (pScriptGroup->pList)
+             pScriptGroup->pList->GetParent()->DeleteSubChunk(pScriptGroup->pList);
+         delete pScriptGroup;
+     }
+     void File::LoadScriptGroups() {
+         if (pScriptGroups) return;
+         pScriptGroups = new std::list<ScriptGroup*>;
+         RIFF::List* lstLS = pRIFF->GetSubList(LIST_TYPE_3LS);
+         if (lstLS) {
+             for (RIFF::List* lst = lstLS->GetFirstSubList(); lst;
+                  lst = lstLS->GetNextSubList())
+             {
+                 if (lst->GetListType() == LIST_TYPE_RTIS) {
+                     pScriptGroups->push_back(new ScriptGroup(this, lst));
+                 }
+             }
+         }
+     }
+     /** @brief Returns the version number of libgig's Giga file format extension.
+      *
+      * libgig added several new features which were not available with the
+      * original GigaStudio software. For those purposes libgig's own custom RIFF
+      * chunks were added to the Giga file format.
+      *
+      * This method returns the version number of the Giga file format extension
+      * used in this Giga file. Currently there are 3 possible values that might
+      * be returned by this method:
+      *
+      * - @c 0: This gig file is not using any libgig specific file format
+      *         extension at all.
+      * - @c 1: This gig file uses the RT instrument script format extension.
+      * - @c 2: This gig file additionally provides support for monolithic
+      *         large gig files (larger than 2 GB).
+      *
+      * @note This method is currently protected and shall not be used as public
+      * API method, since its method signature might change in future.
+      */
+     uint File::GetFormatExtensionVersion() const {
+         RIFF::List* lst3LS = pRIFF->GetSubList(LIST_TYPE_3LS);
+         if (!lst3LS) return 0; // is not using custom Giga format extensions at all
+         RIFF::Chunk* ckFFmt = lst3LS->GetSubChunk(CHUNK_ID_FFMT);
+         if (!ckFFmt) return 1; // uses custom Giga format extension(s) but had no format version saved
+         uint8_t* pData = (uint8_t*) ckFFmt->LoadChunkData();
+         return load32(pData);
+     }
+     /** @brief Returns true in case this file is stored as one, single monolithic gig file.
+      *
+      * To avoid issues with operating systems which did not support large files
+      * (larger than 2 GB) the original Giga file format avoided to ever save gig
+      * files larger than 2 GB, instead such large Giga files were splitted into
+      * several files, each one not being larger than 2 GB. It used a predefined
+      * file name scheme for them like this:
+      * @code
+      * foo.gig
+      * foo.gx01
+      * foo.gx02
+      * foo.gx03
+      * ...
+      * @endcode
+      * So when like in this example foo.gig was loaded, all other files
+      * (foo.gx01, ...) were automatically loaded as well to make up the overall
+      * large gig file (provided they were located at the same directory). Such
+      * additional .gxYY files were called "extension files".
+      *
+      * Since nowadays all modern systems support large files, libgig always
+      * saves large gig files as one single monolithic gig file instead, that
+      * is libgig won't split such a large gig file into separate files like the
+      * original GigaStudio software did. It uses a custom Giga file format
+      * extension for this feature.
+      *
+      * For still being able though to load old splitted gig files and the new
+      * large monolithic ones, this method is used to determine which loading
+      * policy must be used for this gig file.
+      *
+      * @note This method is currently protected and shall not be used as public
+      * API method, since its method signature might change in future and since
+      * this method should not be directly relevant for applications based on
+      * libgig.
+      */
+     bool File::HasMonolithicLargeFilePolicy() const {
+         RIFF::List* lst3LS = pRIFF->GetSubList(LIST_TYPE_3LS);
+         if (!lst3LS) return false;
+         RIFF::Chunk* ckFFmt = lst3LS->GetSubChunk(CHUNK_ID_FFMT);
+         if (!ckFFmt) return false;
+         uint8_t* pData = (uint8_t*) ckFFmt->LoadChunkData();
+         uint32_t formatBitField = load32(&pData[4]);
+         return formatBitField & 1;
+     }
      /**
       * Apply all the gig file's current instruments, samples, groups and settings
       * to the respective RIFF chunks. You have to call Save() to make changes
-Line 4765 
 namespace {
+Line 5921 
 namespace {
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
       *
+      * @param pProgress - callback function for progress notification
       * @throws Exception - on errors
       */
-     void File::UpdateChunks() {
+     void File::UpdateChunks(progress_t* pProgress) {
          bool newFile = pRIFF->GetSubList(LIST_TYPE_INFO) == NULL;
          b64BitWavePoolOffsets = pVersion && pVersion->major == 3;
+         // update own gig format extension chunks
+         // (not part of the GigaStudio 4 format)
+         RIFF::List* lst3LS = pRIFF->GetSubList(LIST_TYPE_3LS);
+         if (!lst3LS) {
+             lst3LS = pRIFF->AddSubList(LIST_TYPE_3LS);
+         }
+         // Make sure <3LS > chunk is placed before <ptbl> chunk. The precise
+         // location of <3LS > is irrelevant, however it MUST BE located BEFORE
+         // the actual wave data, otherwise the <3LS > chunk becomes
+         // inaccessible on gig files larger than 4GB !
+         RIFF::Chunk* ckPTBL = pRIFF->GetSubChunk(CHUNK_ID_PTBL);
+         pRIFF->MoveSubChunk(lst3LS, ckPTBL);
+         // Update <FFmt> chunk with informations about our file format
+         // extensions. Currently this <FFmt> chunk has the following
+         // layout:
+         //
+         // <uint32> -> (libgig's) File Format Extension version
+         // <uint32> -> Format bit field:
+         //             bit 0: If flag is not set use separate .gx01
+         //                    extension files if file is larger than 2 GB
+         //                    like with the original Giga format, if flag
+         //                    is set use 64 bit sample references and keep
+         //                    everything as one single monolithic gig file.
+         RIFF::Chunk* ckFFmt = lst3LS->GetSubChunk(CHUNK_ID_FFMT);
+         if (!ckFFmt) {
+             const int iChunkSize = 2 * sizeof(uint32_t);
+             ckFFmt = lst3LS->AddSubChunk(CHUNK_ID_FFMT, iChunkSize);
+         }
+         {
+             uint8_t* pData = (uint8_t*) ckFFmt->LoadChunkData();
+             store32(&pData[0], GIG_FILE_EXT_VERSION);
+             // for now we always save gig files larger than 2 GB as one
+             // single monolithic file (saving those with extension files is
+             // currently not supported and probably also not desired anymore
+             // nowadays).
+             uint32_t formatBitfield = 1;
+             store32(&pData[4], formatBitfield);
+         }
+         // This must be performed before writing the chunks for instruments,
+         // because the instruments' script slots will write the file offsets
+         // of the respective instrument script chunk as reference.
+         if (pScriptGroups) {
+             // Update instrument script (group) chunks.
+             for (std::list<ScriptGroup*>::iterator it = pScriptGroups->begin();
+                  it != pScriptGroups->end(); ++it)
+             {
+                 (*it)->UpdateChunks(pProgress);
+             }
+         }
          // first update base class's chunks
-         DLS::File::UpdateChunks();
+         DLS::File::UpdateChunks(pProgress);
          if (newFile) {
              // INFO was added by Resource::UpdateChunks - make sure it
-Line 4810 
 namespace {
+Line 6018 
 namespace {
              std::list<Group*>::iterator iter = pGroups->begin();
              std::list<Group*>::iterator end  = pGroups->end();
              for (; iter != end; ++iter) {
-                 (*iter)->UpdateChunks();
+                 (*iter)->UpdateChunks(pProgress);
              }
          }
-Line 4942 
 namespace {
+Line 6150 
 namespace {
              if (einf && pVersion && pVersion->major == 3) pRIFF->MoveSubChunk(_3crc, einf);
          }
      }
+     void File::UpdateFileOffsets() {
+         DLS::File::UpdateFileOffsets();
+         for (Instrument* instrument = GetFirstInstrument(); instrument;
+              instrument = GetNextInstrument())
+         {
+             instrument->UpdateScriptFileOffsets();
+         }
+     }
      /**
       * Enable / disable automatic loading. By default this properyt is

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