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

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

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-revision 2682 by schoenebeck,
Mon Dec 29 16:25:51 2014 UTC
+revision 3481 by schoenebeck,
Fri Feb 22 12:12:50 2019 UTC
 Line 2
   *                                                                         *
   *   libgig - C++ cross-platform Gigasampler format file access library    *
   *                                                                         *
-  *   Copyright (C) 2003-2014 by Christian Schoenebeck                      *
+  *   Copyright (C) 2003-2019 by Christian Schoenebeck                      *
   *                              <cuse@users.sourceforge.net>               *
   *                                                                         *
   *   This library is free software; you can redistribute it and/or modify  *
 Line 24
  #include "gig.h"
  #include "helper.h"
+ #include "Serialization.h"
  #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
  /// the biggest sample piece expected to be read by the sampler engine,
-Line 51
+Line 56
  #define GIG_EG_CTR_DECAY_INFLUENCE_ENCODE(x)    ((x & 0x03) << 3)
  #define GIG_EG_CTR_RELEASE_INFLUENCE_ENCODE(x)  ((x & 0x03) << 5)
+ #define SRLZ(member) \
+     archive->serializeMember(*this, member, #member);
  namespace gig {
  // *************** Internal functions for sample decompression ***************
-Line 91 
 namespace {
+Line 99 
 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 128 
 namespace {
+Line 136 
 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 265 
 namespace {
+Line 273 
 namespace {
       * steps.
       *
       * Once the whole data was processed by __calculateCRC(), one should
-      * call __encodeCRC() to get the final CRC result.
+      * call __finalizeCRC() to get the final CRC result.
       *
       * @param buf     - pointer to data the CRC shall be calculated of
       * @param bufSize - size of the data to be processed
       * @param crc     - variable the CRC sum shall be stored to
       */
-     static void __calculateCRC(unsigned char* buf, int bufSize, uint32_t& crc) {
+     static void __calculateCRC(unsigned char* buf, size_t bufSize, uint32_t& crc) {
-         for (int i = 0 ; i < bufSize ; i++) {
+         for (size_t i = 0 ; i < bufSize ; i++) {
              crc = __CRCTable[(crc ^ buf[i]) & 0xff] ^ (crc >> 8);
          }
      }
-Line 282 
 namespace {
+Line 290 
 namespace {
       *
       * @param crc - variable previously passed to __calculateCRC()
       */
-     inline static uint32_t __encodeCRC(const uint32_t& crc) {
+     inline static void __finalizeCRC(uint32_t& crc) {
-         return crc ^ 0xffffffff;
+         crc ^= 0xffffffff;
      }
-Line 311 
 namespace {
+Line 319 
 namespace {
+ // *************** leverage_ctrl_t ***************
+ // *
+     void leverage_ctrl_t::serialize(Serialization::Archive* archive) {
+         SRLZ(type);
+         SRLZ(controller_number);
+     }
+ // *************** crossfade_t ***************
+ // *
+     void crossfade_t::serialize(Serialization::Archive* archive) {
+         SRLZ(in_start);
+         SRLZ(in_end);
+         SRLZ(out_start);
+         SRLZ(out_end);
+     }
+ // *************** eg_opt_t ***************
+ // *
+     eg_opt_t::eg_opt_t() {
+         AttackCancel     = true;
+         AttackHoldCancel = true;
+         Decay1Cancel     = true;
+         Decay2Cancel     = true;
+         ReleaseCancel    = true;
+     }
+     void eg_opt_t::serialize(Serialization::Archive* archive) {
+         SRLZ(AttackCancel);
+         SRLZ(AttackHoldCancel);
+         SRLZ(Decay1Cancel);
+         SRLZ(Decay2Cancel);
+         SRLZ(ReleaseCancel);
+     }
  // *************** Sample ***************
  // *
-     unsigned int Sample::Instances = 0;
+     size_t       Sample::Instances = 0;
      buffer_t     Sample::InternalDecompressionBuffer;
      /** @brief Constructor.
-Line 334 
 namespace {
+Line 385 
 namespace {
       *                         ('wvpl') list chunk
       * @param fileNo         - number of an extension file where this sample
       *                         is located, 0 otherwise
+      * @param index          - wave pool index of sample (may be -1 on new sample)
       */
-     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, int index)
+         : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset)
+     {
          static const DLS::Info::string_length_t fixedStringLengths[] = {
              { CHUNK_ID_INAM, 64 },
              { 0, 0 }
-Line 345 
 namespace {
+Line 399 
 namespace {
          FileNo = fileNo;
          __resetCRC(crc);
+         // if this is not a new sample, try to get the sample's already existing
+         // CRC32 checksum from disk, this checksum will reflect the sample's CRC32
+         // checksum of the time when the sample was consciously modified by the
+         // user for the last time (by calling Sample::Write() that is).
+         if (index >= 0) { // not a new file ...
+             try {
+                 uint32_t crc = pFile->GetSampleChecksumByIndex(index);
+                 this->crc = crc;
+             } catch (...) {}
+         }
          pCk3gix = waveList->GetSubChunk(CHUNK_ID_3GIX);
          if (pCk3gix) {
+             pCk3gix->SetPos(0);
              uint16_t iSampleGroup = pCk3gix->ReadInt16();
              pGroup = pFile->GetGroup(iSampleGroup);
          } else { // '3gix' chunk missing
-Line 357 
 namespace {
+Line 423 
 namespace {
          pCkSmpl = waveList->GetSubChunk(CHUNK_ID_SMPL);
          if (pCkSmpl) {
+             pCkSmpl->SetPos(0);
              Manufacturer  = pCkSmpl->ReadInt32();
              Product       = pCkSmpl->ReadInt32();
              SamplePeriod  = pCkSmpl->ReadInt32();
-Line 403 
 namespace {
+Line 471 
 namespace {
          Dithered          = false;
          TruncatedBits     = 0;
          if (Compressed) {
+             ewav->SetPos(0);
              uint32_t version = ewav->ReadInt32();
-             if (version == 3 && BitDepth == 24) {
+             if (version > 2 && BitDepth == 24) {
                  Dithered = ewav->ReadInt32();
                  ewav->SetPos(Channels == 2 ? 84 : 64);
                  TruncatedBits = ewav->ReadInt32();
-Line 477 
 namespace {
+Line 547 
 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 565 
 namespace {
+Line 635 
 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 581 
 namespace {
+Line 651 
 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 600 
 namespace {
+Line 670 
 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 616 
 namespace {
+Line 686 
 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 659 
 namespace {
+Line 729 
 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 718 
 namespace {
+Line 788 
 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 785 
 namespace {
+Line 855 
 namespace {
       * FormatTag must be DLS_WAVE_FORMAT_PCM. Trying to resize samples with
       * other formats will fail!
       *
-      * @param iNewSize - new sample wave data size in sample points (must be
+      * @param NewSize - new sample wave data size in sample points (must be
-      *                   greater than zero)
+      *                  greater than zero)
       * @throws DLS::Excecption if FormatTag != DLS_WAVE_FORMAT_PCM
-      *                         or if \a iNewSize is less than 1
+      * @throws DLS::Exception if \a NewSize is less than 1 or unrealistic large
       * @throws gig::Exception if existing sample is compressed
       * @see DLS::Sample::GetSize(), DLS::Sample::FrameSize,
       *      DLS::Sample::FormatTag, File::Save()
       */
-     void Sample::Resize(int iNewSize) {
+     void Sample::Resize(file_offset_t NewSize) {
          if (Compressed) throw gig::Exception("There is no support for modifying compressed samples (yet)");
-         DLS::Sample::Resize(iNewSize);
+         DLS::Sample::Resize(NewSize);
      }
      /**
-Line 819 
 namespace {
+Line 889 
 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 837 
 namespace {
+Line 907 
 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 853 
 namespace {
+Line 923 
 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 892 
 namespace {
+Line 962 
 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 932 
 namespace {
+Line 1002 
 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 983 
 namespace {
+Line 1053 
 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 1067 
 namespace {
+Line 1137 
 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 1082 
 namespace {
+Line 1152 
 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 1105 
 namespace {
+Line 1175 
 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 1256 
 namespace {
+Line 1326 
 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 1265 
 namespace {
+Line 1335 
 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 1277 
 namespace {
+Line 1347 
 namespace {
          // if this is the last write, update the checksum chunk in the
          // file
          if (pCkData->GetPos() == pCkData->GetSize()) {
+             __finalizeCRC(crc);
              File* pFile = static_cast<File*>(GetParent());
-             pFile->SetSampleChecksum(this, __encodeCRC(crc));
+             pFile->SetSampleChecksum(this, crc);
          }
          return res;
      }
-Line 1299 
 namespace {
+Line 1370 
 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 1337 
 namespace {
+Line 1408 
 namespace {
          return pGroup;
      }
+     /**
+      * Returns the CRC-32 checksum of the sample's raw wave form data at the
+      * time when this sample's wave form data was modified for the last time
+      * by calling Write(). This checksum only covers the raw wave form data,
+      * not any meta informations like i.e. bit depth or loop points. Since
+      * this method just returns the checksum stored for this sample i.e. when
+      * the gig file was loaded, this method returns immediately. So it does no
+      * recalcuation of the checksum with the currently available sample wave
+      * form data.
+      *
+      * @see VerifyWaveData()
+      */
+     uint32_t Sample::GetWaveDataCRC32Checksum() {
+         return crc;
+     }
+     /**
+      * Checks the integrity of this sample's raw audio wave data. Whenever a
+      * Sample's raw wave data is intentionally modified (i.e. by calling
+      * Write() and supplying the new raw audio wave form data) a CRC32 checksum
+      * is calculated and stored/updated for this sample, along to the sample's
+      * meta informations.
+      *
+      * Now by calling this method the current raw audio wave data is checked
+      * against the already stored CRC32 check sum in order to check whether the
+      * sample data had been damaged unintentionally for some reason. Since by
+      * calling this method always the entire raw audio wave data has to be
+      * read, verifying all samples this way may take a long time accordingly.
+      * And that's also the reason why the sample integrity is not checked by
+      * default whenever a gig file is loaded. So this method must be called
+      * explicitly to fulfill this task.
+      *
+      * @param pActually - (optional) if provided, will be set to the actually
+      *                    calculated checksum of the current raw wave form data,
+      *                    you can get the expected checksum instead by calling
+      *                    GetWaveDataCRC32Checksum()
+      * @returns true if sample is OK or false if the sample is damaged
+      * @throws Exception if no checksum had been stored to disk for this
+      *         sample yet, or on I/O issues
+      * @see GetWaveDataCRC32Checksum()
+      */
+     bool Sample::VerifyWaveData(uint32_t* pActually) {
+         //File* pFile = static_cast<File*>(GetParent());
+         uint32_t crc = CalculateWaveDataChecksum();
+         if (pActually) *pActually = crc;
+         return crc == this->crc;
+     }
+     uint32_t Sample::CalculateWaveDataChecksum() {
+         const size_t sz = 20*1024; // 20kB buffer size
+         std::vector<uint8_t> buffer(sz);
+         buffer.resize(sz);
+         const size_t n = sz / FrameSize;
+         SetPos(0);
+         uint32_t crc = 0;
+         __resetCRC(crc);
+         while (true) {
+             file_offset_t nRead = Read(&buffer[0], n);
+             if (nRead <= 0) break;
+             __calculateCRC(&buffer[0], nRead * FrameSize, crc);
+         }
+         __finalizeCRC(crc);
+         return crc;
+     }
      Sample::~Sample() {
          Instances--;
          if (!Instances && InternalDecompressionBuffer.Size) {
-Line 1353 
 namespace {
+Line 1490 
 namespace {
  // *************** DimensionRegion ***************
  // *
-     uint                               DimensionRegion::Instances       = 0;
+     size_t                             DimensionRegion::Instances       = 0;
      DimensionRegion::VelocityTableMap* DimensionRegion::pVelocityTables = NULL;
      DimensionRegion::DimensionRegion(Region* pParent, RIFF::List* _3ewl) : DLS::Sampler(_3ewl) {
-Line 1369 
 namespace {
+Line 1506 
 namespace {
          RIFF::Chunk* _3ewa = _3ewl->GetSubChunk(CHUNK_ID_3EWA);
          if (_3ewa) { // if '3ewa' chunk exists
+             _3ewa->SetPos(0);
              _3ewa->ReadInt32(); // unknown, always == chunk size ?
              LFO3Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
              EG3Attack     = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
-Line 1547 
 namespace {
+Line 1686 
 namespace {
              EG2Attack                       = 0.0;
              EG2Decay1                       = 0.005;
              EG2Sustain                      = 1000;
-             EG2Release                      = 0.3;
+             EG2Release                      = 60;
              LFO2ControlDepth                = 0;
              LFO2Frequency                   = 1.0;
              LFO2InternalDepth               = 0;
-Line 1601 
 namespace {
+Line 1740 
 namespace {
              VCFType                         = vcf_type_lowpass;
              memset(DimensionUpperLimits, 127, 8);
          }
+         // chunk for own format extensions, these will *NOT* work with Gigasampler/GigaStudio !
+         RIFF::Chunk* lsde = _3ewl->GetSubChunk(CHUNK_ID_LSDE);
+         if (lsde) { // format extension for EG behavior options
+             lsde->SetPos(0);
+             eg_opt_t* pEGOpts[2] = { &EG1Options, &EG2Options };
+             for (int i = 0; i < 2; ++i) { // NOTE: we reserved a 3rd byte for a potential future EG3 option
+                 unsigned char byte = lsde->ReadUint8();
+                 pEGOpts[i]->AttackCancel     = byte & 1;
+                 pEGOpts[i]->AttackHoldCancel = byte & (1 << 1);
+                 pEGOpts[i]->Decay1Cancel     = byte & (1 << 2);
+                 pEGOpts[i]->Decay2Cancel     = byte & (1 << 3);
+                 pEGOpts[i]->ReleaseCancel    = byte & (1 << 4);
+             }
+         }
+         // format extension for sustain pedal up effect on release trigger samples
+         if (lsde && lsde->GetSize() > 3) { // NOTE: we reserved the 3rd byte for a potential future EG3 option
+             lsde->SetPos(3);
+             uint8_t byte = lsde->ReadUint8();
+             SustainReleaseTrigger   = static_cast<sust_rel_trg_t>(byte & 0x03);
+             NoNoteOffReleaseTrigger = byte >> 7;
+         } else {
+             SustainReleaseTrigger   = sust_rel_trg_none;
+             NoNoteOffReleaseTrigger = false;
+         }
          pVelocityAttenuationTable = GetVelocityTable(VelocityResponseCurve,
                                                       VelocityResponseDepth,
-Line 1706 
 namespace {
+Line 1870 
 namespace {
          }
      }
+     void DimensionRegion::serialize(Serialization::Archive* archive) {
+         // in case this class will become backward incompatible one day,
+         // then set a version and minimum version for this class like:
+         //archive->setVersion(*this, 2);
+         //archive->setMinVersion(*this, 1);
+         SRLZ(VelocityUpperLimit);
+         SRLZ(EG1PreAttack);
+         SRLZ(EG1Attack);
+         SRLZ(EG1Decay1);
+         SRLZ(EG1Decay2);
+         SRLZ(EG1InfiniteSustain);
+         SRLZ(EG1Sustain);
+         SRLZ(EG1Release);
+         SRLZ(EG1Hold);
+         SRLZ(EG1Controller);
+         SRLZ(EG1ControllerInvert);
+         SRLZ(EG1ControllerAttackInfluence);
+         SRLZ(EG1ControllerDecayInfluence);
+         SRLZ(EG1ControllerReleaseInfluence);
+         SRLZ(LFO1Frequency);
+         SRLZ(LFO1InternalDepth);
+         SRLZ(LFO1ControlDepth);
+         SRLZ(LFO1Controller);
+         SRLZ(LFO1FlipPhase);
+         SRLZ(LFO1Sync);
+         SRLZ(EG2PreAttack);
+         SRLZ(EG2Attack);
+         SRLZ(EG2Decay1);
+         SRLZ(EG2Decay2);
+         SRLZ(EG2InfiniteSustain);
+         SRLZ(EG2Sustain);
+         SRLZ(EG2Release);
+         SRLZ(EG2Controller);
+         SRLZ(EG2ControllerInvert);
+         SRLZ(EG2ControllerAttackInfluence);
+         SRLZ(EG2ControllerDecayInfluence);
+         SRLZ(EG2ControllerReleaseInfluence);
+         SRLZ(LFO2Frequency);
+         SRLZ(LFO2InternalDepth);
+         SRLZ(LFO2ControlDepth);
+         SRLZ(LFO2Controller);
+         SRLZ(LFO2FlipPhase);
+         SRLZ(LFO2Sync);
+         SRLZ(EG3Attack);
+         SRLZ(EG3Depth);
+         SRLZ(LFO3Frequency);
+         SRLZ(LFO3InternalDepth);
+         SRLZ(LFO3ControlDepth);
+         SRLZ(LFO3Controller);
+         SRLZ(LFO3Sync);
+         SRLZ(VCFEnabled);
+         SRLZ(VCFType);
+         SRLZ(VCFCutoffController);
+         SRLZ(VCFCutoffControllerInvert);
+         SRLZ(VCFCutoff);
+         SRLZ(VCFVelocityCurve);
+         SRLZ(VCFVelocityScale);
+         SRLZ(VCFVelocityDynamicRange);
+         SRLZ(VCFResonance);
+         SRLZ(VCFResonanceDynamic);
+         SRLZ(VCFResonanceController);
+         SRLZ(VCFKeyboardTracking);
+         SRLZ(VCFKeyboardTrackingBreakpoint);
+         SRLZ(VelocityResponseCurve);
+         SRLZ(VelocityResponseDepth);
+         SRLZ(VelocityResponseCurveScaling);
+         SRLZ(ReleaseVelocityResponseCurve);
+         SRLZ(ReleaseVelocityResponseDepth);
+         SRLZ(ReleaseTriggerDecay);
+         SRLZ(Crossfade);
+         SRLZ(PitchTrack);
+         SRLZ(DimensionBypass);
+         SRLZ(Pan);
+         SRLZ(SelfMask);
+         SRLZ(AttenuationController);
+         SRLZ(InvertAttenuationController);
+         SRLZ(AttenuationControllerThreshold);
+         SRLZ(ChannelOffset);
+         SRLZ(SustainDefeat);
+         SRLZ(MSDecode);
+         //SRLZ(SampleStartOffset);
+         SRLZ(SampleAttenuation);
+         SRLZ(EG1Options);
+         SRLZ(EG2Options);
+         SRLZ(SustainReleaseTrigger);
+         SRLZ(NoNoteOffReleaseTrigger);
+         // derived attributes from DLS::Sampler
+         SRLZ(FineTune);
+         SRLZ(Gain);
+     }
      /**
       * Updates the respective member variable and updates @c SampleAttenuation
       * which depends on this value.
-Line 1739 
 namespace {
+Line 1996 
 namespace {
          RIFF::Chunk* _3ewa = pParentList->GetSubChunk(CHUNK_ID_3EWA);
          if (!_3ewa) {
              File* pFile = (File*) GetParent()->GetParent()->GetParent();
-             bool version3 = pFile->pVersion && pFile->pVersion->major == 3;
+             bool versiongt2 = pFile->pVersion && pFile->pVersion->major > 2;
-             _3ewa = pParentList->AddSubChunk(CHUNK_ID_3EWA, version3 ? 148 : 140);
+             _3ewa = pParentList->AddSubChunk(CHUNK_ID_3EWA, versiongt2 ? 148 : 140);
          }
          pData = (uint8_t*) _3ewa->LoadChunkData();
          // update '3ewa' chunk with DimensionRegion's current settings
-         const uint32_t chunksize = _3ewa->GetNewSize();
+         const uint32_t chunksize = (uint32_t) _3ewa->GetNewSize();
          store32(&pData[0], chunksize); // unknown, always chunk size?
          const int32_t lfo3freq = (int32_t) GIG_EXP_ENCODE(LFO3Frequency);
-Line 2006 
 namespace {
+Line 2263 
 namespace {
          if (chunksize >= 148) {
              memcpy(&pData[140], DimensionUpperLimits, 8);
          }
+         // chunk for own format extensions, these will *NOT* work with
+         // Gigasampler/GigaStudio !
+         RIFF::Chunk* lsde = pParentList->GetSubChunk(CHUNK_ID_LSDE);
+         const int lsdeSize = 4; // NOTE: we reserved the 3rd byte for a potential future EG3 option
+         if (!lsde) {
+             // only add this "LSDE" chunk if either EG options or release
+             // trigger options deviate from their default behaviour
+             eg_opt_t defaultOpt;
+             if (memcmp(&EG1Options, &defaultOpt, sizeof(eg_opt_t)) ||
+                 memcmp(&EG2Options, &defaultOpt, sizeof(eg_opt_t)) ||
+                 SustainReleaseTrigger || NoNoteOffReleaseTrigger)
+             {
+                 lsde = pParentList->AddSubChunk(CHUNK_ID_LSDE, lsdeSize);
+                 // move LSDE chunk to the end of parent list
+                 pParentList->MoveSubChunk(lsde, (RIFF::Chunk*)NULL);
+             }
+         }
+         if (lsde) {
+             if (lsde->GetNewSize() < lsdeSize)
+                 lsde->Resize(lsdeSize);
+             // format extension for EG behavior options
+             unsigned char* pData = (unsigned char*) lsde->LoadChunkData();
+             eg_opt_t* pEGOpts[2] = { &EG1Options, &EG2Options };
+             for (int i = 0; i < 2; ++i) { // NOTE: we reserved the 3rd byte for a potential future EG3 option
+                 pData[i] =
+                     (pEGOpts[i]->AttackCancel     ? 1 : 0) |
+                     (pEGOpts[i]->AttackHoldCancel ? (1<<1) : 0) |
+                     (pEGOpts[i]->Decay1Cancel     ? (1<<2) : 0) |
+                     (pEGOpts[i]->Decay2Cancel     ? (1<<3) : 0) |
+                     (pEGOpts[i]->ReleaseCancel    ? (1<<4) : 0);
+             }
+             // format extension for release trigger options
+             pData[3] = static_cast<uint8_t>(SustainReleaseTrigger) | (NoNoteOffReleaseTrigger ? (1<<7) : 0);
+         }
      }
      double* DimensionRegion::GetReleaseVelocityTable(curve_type_t releaseVelocityResponseCurve, uint8_t releaseVelocityResponseDepth) {
-Line 2045 
 namespace {
+Line 2337 
 namespace {
      // get the corresponding velocity table from the table map or create & calculate that table if it doesn't exist yet
      double* DimensionRegion::GetVelocityTable(curve_type_t curveType, uint8_t depth, uint8_t scaling)
      {
+         // sanity check input parameters
+         // (fallback to some default parameters on ill input)
+         switch (curveType) {
+             case curve_type_nonlinear:
+             case curve_type_linear:
+                 if (depth > 4) {
+                     printf("Warning: Invalid depth (0x%x) for velocity curve type (0x%x).\n", depth, curveType);
+                     depth   = 0;
+                     scaling = 0;
+                 }
+                 break;
+             case curve_type_special:
+                 if (depth > 5) {
+                     printf("Warning: Invalid depth (0x%x) for velocity curve type 'special'.\n", depth);
+                     depth   = 0;
+                     scaling = 0;
+                 }
+                 break;
+             case curve_type_unknown:
+             default:
+                 printf("Warning: Unknown velocity curve type (0x%x).\n", curveType);
+                 curveType = curve_type_linear;
+                 depth     = 0;
+                 scaling   = 0;
+                 break;
+         }
          double* table;
          uint32_t tableKey = (curveType<<16) | (depth<<8) | scaling;
          if (pVelocityTables->count(tableKey)) { // if key exists
-Line 2420 
 namespace {
+Line 2739 
 namespace {
              // unknown controller type
              default:
-                 throw gig::Exception("Unknown leverage controller type.");
+                 decodedcontroller.type = leverage_ctrl_t::type_none;
+                 decodedcontroller.controller_number = 0;
+                 printf("Warning: Unknown leverage controller type (0x%x).\n", EncodedController);
+                 break;
          }
          return decodedcontroller;
      }
-Line 2914 
 namespace {
+Line 3236 
 namespace {
          }
          Layers = 1;
          File* file = (File*) GetParent()->GetParent();
-         int dimensionBits = (file->pVersion && file->pVersion->major == 3) ? 8 : 5;
+         int dimensionBits = (file->pVersion && file->pVersion->major > 2) ? 8 : 5;
          // Actual Loading
-Line 2924 
 namespace {
+Line 3246 
 namespace {
          RIFF::Chunk* _3lnk = rgnList->GetSubChunk(CHUNK_ID_3LNK);
          if (_3lnk) {
+             _3lnk->SetPos(0);
              DimensionRegions = _3lnk->ReadUint32();
              for (int i = 0; i < dimensionBits; i++) {
                  dimension_t dimension = static_cast<dimension_t>(_3lnk->ReadUint8());
-Line 2958 
 namespace {
+Line 3282 
 namespace {
              UpdateVelocityTable();
              // jump to start of the wave pool indices (if not already there)
-             if (file->pVersion && file->pVersion->major == 3)
+             if (file->pVersion && file->pVersion->major > 2)
                  _3lnk->SetPos(68); // version 3 has a different 3lnk structure
              else
                  _3lnk->SetPos(44);
-Line 2967 
 namespace {
+Line 3291 
 namespace {
              if (file->GetAutoLoad()) {
                  for (uint i = 0; i < DimensionRegions; i++) {
                      uint32_t wavepoolindex = _3lnk->ReadUint32();
-                     if (file->pWavePoolTable) pDimensionRegions[i]->pSample = GetSampleFromWavePool(wavepoolindex);
+                     if (file->pWavePoolTable && pDimensionRegions[i])
+                         pDimensionRegions[i]->pSample = GetSampleFromWavePool(wavepoolindex);
                  }
                  GetSample(); // load global region sample reference
              }
-Line 3016 
 namespace {
+Line 3341 
 namespace {
          }
          File* pFile = (File*) GetParent()->GetParent();
-         bool version3 = pFile->pVersion && pFile->pVersion->major == 3;
+         bool versiongt2 = pFile->pVersion && pFile->pVersion->major > 2;
-         const int iMaxDimensions =  version3 ? 8 : 5;
+         const int iMaxDimensions =  versiongt2 ? 8 : 5;
-         const int iMaxDimensionRegions = version3 ? 256 : 32;
+         const int iMaxDimensionRegions = versiongt2 ? 256 : 32;
          // make sure '3lnk' chunk exists
          RIFF::Chunk* _3lnk = pCkRegion->GetSubChunk(CHUNK_ID_3LNK);
          if (!_3lnk) {
-             const int _3lnkChunkSize = version3 ? 1092 : 172;
+             const int _3lnkChunkSize = versiongt2 ? 1092 : 172;
              _3lnk = pCkRegion->AddSubChunk(CHUNK_ID_3LNK, _3lnkChunkSize);
              memset(_3lnk->LoadChunkData(), 0, _3lnkChunkSize);
-Line 3047 
 namespace {
+Line 3372 
 namespace {
          }
          // update wave pool table in '3lnk' chunk
-         const int iWavePoolOffset = version3 ? 68 : 44;
+         const int iWavePoolOffset = versiongt2 ? 68 : 44;
          for (uint i = 0; i < iMaxDimensionRegions; i++) {
              int iWaveIndex = -1;
              if (i < DimensionRegions) {
-Line 3102 
 namespace {
+Line 3427 
 namespace {
          int step = 1;
          for (int i = 0 ; i < veldim ; i++) step <<= pDimensionDefinitions[i].bits;
          int skipveldim = (step << pDimensionDefinitions[veldim].bits) - step;
-         int end = step * pDimensionDefinitions[veldim].zones;
          // loop through all dimension regions for all dimensions except the velocity dimension
          int dim[8] = { 0 };
          for (int i = 0 ; i < DimensionRegions ; i++) {
+             const int end = i + step * pDimensionDefinitions[veldim].zones;
+             // create a velocity table for all cases where the velocity zone is zero
              if (pDimensionRegions[i]->DimensionUpperLimits[veldim] ||
                  pDimensionRegions[i]->VelocityUpperLimit) {
                  // create the velocity table
-Line 3138 
 namespace {
+Line 3464 
 namespace {
                  }
              }
+             // jump to the next case where the velocity zone is zero
              int j;
              int shift = 0;
              for (j = 0 ; j < Dimensions ; j++) {
-Line 3188 
 namespace {
+Line 3515 
 namespace {
          // check if max. amount of dimensions reached
          File* file = (File*) GetParent()->GetParent();
-         const int iMaxDimensions = (file->pVersion && file->pVersion->major == 3) ? 8 : 5;
+         const int iMaxDimensions = (file->pVersion && file->pVersion->major > 2) ? 8 : 5;
          if (Dimensions >= iMaxDimensions)
              throw gig::Exception("Could not add new dimension, max. amount of " + ToString(iMaxDimensions) + " dimensions already reached");
          // check if max. amount of dimension bits reached
-Line 3480 
 namespace {
+Line 3807 
 namespace {
          }
          // delete temporary region
+         tempRgn->DeleteChunks();
          delete tempRgn;
          UpdateVelocityTable();
-Line 3619 
 namespace {
+Line 3947 
 namespace {
          }
          // delete temporary region
+         tempRgn->DeleteChunks();
          delete tempRgn;
          UpdateVelocityTable();
-Line 3712 
 namespace {
+Line 4041 
 namespace {
      DimensionRegion* Region::GetDimensionRegionByValue(const uint DimValues[8]) {
          uint8_t bits;
          int veldim = -1;
-         int velbitpos;
+         int velbitpos = 0;
          int bitpos = 0;
          int dimregidx = 0;
          for (uint i = 0; i < Dimensions; i++) {
-Line 3761 
 namespace {
+Line 4090 
 namespace {
      int Region::GetDimensionRegionIndexByValue(const uint DimValues[8]) {
          uint8_t bits;
          int veldim = -1;
-         int velbitpos;
+         int velbitpos = 0;
          int bitpos = 0;
          int dimregidx = 0;
          for (uint i = 0; i < Dimensions; i++) {
-Line 3846 
 namespace {
+Line 4175 
 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 (WavePoolTableIndex + 1 > file->WavePoolCount) return NULL;
-         unsigned long soughtfileno = file->pWavePoolTableHi[WavePoolTableIndex];
+         // for new files or files >= 2 GB use 64 bit wave pool offsets
-         Sample* sample = file->GetFirstSample(pProgress);
+         if (file->pRIFF->IsNew() || (file->pRIFF->GetCurrentFileSize() >> 31)) {
-         while (sample) {
+             // use 64 bit wave pool offsets (treating this as large file)
-             if (sample->ulWavePoolOffset == soughtoffset &&
+             uint64_t soughtoffset =
-                 sample->FileNo == soughtfileno) return static_cast<gig::Sample*>(sample);
+                 uint64_t(file->pWavePoolTable[WavePoolTableIndex]) |
-             sample = file->GetNextSample();
+                 uint64_t(file->pWavePoolTableHi[WavePoolTableIndex]) << 32;
+             Sample* sample = file->GetFirstSample(pProgress);
+             while (sample) {
+                 if (sample->ullWavePoolOffset == soughtoffset)
+                     return static_cast<gig::Sample*>(sample);
+                 sample = file->GetNextSample();
+             }
+         } else {
+             // use extension files and 32 bit wave pool offsets
+             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 4081 
 namespace {
+Line 4426 
 namespace {
          pGroup = group;
          pChunk = ckScri;
          if (ckScri) { // object is loaded from file ...
+             ckScri->SetPos(0);
              // read header
              uint32_t headerSize = ckScri->ReadUint32();
              Compression = (Compression_t) ckScri->ReadUint32();
-Line 4095 
 namespace {
+Line 4442 
 namespace {
              // 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();
+             uint32_t scriptSize = uint32_t(ckScri->GetSize() - ckScri->GetPos());
              data.resize(scriptSize);
              for (int i = 0; i < scriptSize; ++i)
                  data[i] = ckScri->ReadUint8();
-Line 4133 
 namespace {
+Line 4480 
 namespace {
          memcpy(&data[0], &text[0], text.size());
      }
+     /** @brief Remove all RIFF chunks associated with this Script object.
+      *
+      * At the moment Script::DeleteChunks() does nothing. It is
+      * recommended to call this method explicitly though from deriving classes's
+      * own overridden implementation of this method to avoid potential future
+      * compatiblity issues.
+      *
+      * See DLS::Storage::DeleteChunks() for details.
+      */
+     void Script::DeleteChunks() {
+     }
      /**
       * Apply this script to the respective RIFF chunks. You have to call
       * File::Save() to make changes persistent.
-Line 4146 
 namespace {
+Line 4505 
 namespace {
          // recalculate CRC32 check sum
          __resetCRC(crc);
          __calculateCRC(&data[0], data.size(), crc);
-         __encodeCRC(crc);
+         __finalizeCRC(crc);
          // make sure chunk exists and has the required size
-         const int chunkSize = 7*sizeof(int32_t) + Name.size() + data.size();
+         const file_offset_t chunkSize = (file_offset_t) 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
+         store32(&pData[pos], uint32_t(6*sizeof(int32_t) + Name.size())); // total header size
          pos += sizeof(int32_t);
          store32(&pData[pos], Compression);
          pos += sizeof(int32_t);
-Line 4166 
 namespace {
+Line 4525 
 namespace {
          pos += sizeof(int32_t);
          store32(&pData[pos], crc);
          pos += sizeof(int32_t);
-         store32(&pData[pos], Name.size());
+         store32(&pData[pos], (uint32_t) Name.size());
          pos += sizeof(int32_t);
          for (int i = 0; i < Name.size(); ++i, ++pos)
              pData[pos] = Name[i];
-Line 4181 
 namespace {
+Line 4540 
 namespace {
       * @param pGroup - script's new group
       */
      void Script::SetGroup(ScriptGroup* pGroup) {
-         if (this->pGroup = pGroup) return;
+         if (this->pGroup == pGroup) return;
          if (pChunk)
              pChunk->GetParent()->MoveSubChunk(pChunk, pGroup->pList);
          this->pGroup = pGroup;
-Line 4197 
 namespace {
+Line 4556 
 namespace {
          return pGroup;
      }
+     /**
+      * Make a (semi) deep copy of the Script object given by @a orig
+      * and assign it to this object. Note: the ScriptGroup this Script
+      * object belongs to remains untouched by this call.
+      *
+      * @param orig - original Script object to be copied from
+      */
+     void Script::CopyAssign(const Script* orig) {
+         Name        = orig->Name;
+         Compression = orig->Compression;
+         Encoding    = orig->Encoding;
+         Language    = orig->Language;
+         Bypass      = orig->Bypass;
+         data        = orig->data;
+     }
      void Script::RemoveAllScriptReferences() {
          File* pFile = pGroup->pFile;
          for (int i = 0; pFile->GetInstrument(i); ++i) {
-Line 4232 
 namespace {
+Line 4607 
 namespace {
          }
      }
+     /** @brief Remove all RIFF chunks associated with this ScriptGroup object.
+      *
+      * At the moment ScriptGroup::DeleteChunks() does nothing. It is
+      * recommended to call this method explicitly though from deriving classes's
+      * own overridden implementation of this method to avoid potential future
+      * compatiblity issues.
+      *
+      * See DLS::Storage::DeleteChunks() for details.
+      */
+     void ScriptGroup::DeleteChunks() {
+     }
      /**
       * Apply this script group to the respective RIFF chunks. You have to call
       * File::Save() to make changes persistent.
-Line 4343 
 namespace {
+Line 4730 
 namespace {
          EffectSend = 0;
          Attenuation = 0;
          FineTune = 0;
-         PitchbendRange = 0;
+         PitchbendRange = 2;
          PianoReleaseMode = false;
          DimensionKeyRange.low = 0;
          DimensionKeyRange.high = 0;
-Line 4356 
 namespace {
+Line 4743 
 namespace {
          if (lart) {
              RIFF::Chunk* _3ewg = lart->GetSubChunk(CHUNK_ID_3EWG);
              if (_3ewg) {
+                 _3ewg->SetPos(0);
                  EffectSend             = _3ewg->ReadUint16();
                  Attenuation            = _3ewg->ReadInt32();
                  FineTune               = _3ewg->ReadInt16();
-Line 4415 
 namespace {
+Line 4804 
 namespace {
          if (lst3LS) {
              RIFF::Chunk* ckSCSL = lst3LS->GetSubChunk(CHUNK_ID_SCSL);
              if (ckSCSL) {
+                 ckSCSL->SetPos(0);
                  int headerSize = ckSCSL->ReadUint32();
                  int slotCount  = ckSCSL->ReadUint32();
                  if (slotCount) {
-Line 4441 
 namespace {
+Line 4832 
 namespace {
          RegionList::iterator end  = pRegions->end();
          for (; iter != end; ++iter) {
              gig::Region* pRegion = static_cast<gig::Region*>(*iter);
-             for (int iKey = pRegion->KeyRange.low; iKey <= pRegion->KeyRange.high; iKey++) {
+             const int low  = std::max(int(pRegion->KeyRange.low), 0);
+             const int high = std::min(int(pRegion->KeyRange.high), 127);
+             for (int iKey = low; iKey <= high; iKey++) {
                  RegionKeyTable[iKey] = pRegion;
              }
          }
-Line 4486 
 namespace {
+Line 4879 
 namespace {
              File* pFile = (File*) GetParent();
              // 3ewg is bigger in gig3, as it includes the iMIDI rules
-             int size = (pFile->pVersion && pFile->pVersion->major == 3) ? 16416 : 12;
+             int size = (pFile->pVersion && pFile->pVersion->major > 2) ? 16416 : 12;
              _3ewg = lart->AddSubChunk(CHUNK_ID_3EWG, size);
              memset(_3ewg->LoadChunkData(), 0, size);
          }
-Line 4518 
 namespace {
+Line 4911 
 namespace {
             RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
             if (!lst3LS) lst3LS = pCkInstrument->AddSubList(LIST_TYPE_3LS);
-            const int slotCount = pScriptRefs->size();
+            const int slotCount = (int) pScriptRefs->size();
             const int headerSize = 3 * sizeof(uint32_t);
             const int slotSize  = 2 * sizeof(uint32_t);
             const int totalChunkSize = headerSize + slotCount * slotSize;
-Line 4554 
 namespace {
+Line 4947 
 namespace {
         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 slotCount = (int) pScriptRefs->size();
             const int headerSize = 3 * sizeof(uint32_t);
             ckSCSL->SetPos(headerSize);
             for (int i = 0; i < slotCount; ++i) {
-                uint32_t fileOffset =
+                uint32_t fileOffset = uint32_t(
                      (*pScriptRefs)[i].script->pChunk->GetFilePos() -
                      (*pScriptRefs)[i].script->pChunk->GetPos() -
-                     CHUNK_HEADER_SIZE;
+                     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 4621 
 namespace {
+Line 5015 
 namespace {
          RIFF::List* rgn = lrgn->AddSubList(LIST_TYPE_RGN);
          Region* pNewRegion = new Region(this, rgn);
          pRegions->push_back(pNewRegion);
-         Regions = pRegions->size();
+         Regions = (uint32_t) pRegions->size();
          // update Region key table for fast lookup
          UpdateRegionKeyTable();
          // done
-Line 4636 
 namespace {
+Line 5030 
 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 4710 
 namespace {
+Line 5161 
 namespace {
                  for (uint s = 0; group->GetScript(s); ++s) {
                      Script* script = group->GetScript(s);
                      if (script->pChunk) {
-                         uint32_t offset = script->pChunk->GetFilePos() -
+                         uint32_t offset = uint32_t(
-                                           script->pChunk->GetPos() -
+                             script->pChunk->GetFilePos() -
-                                           CHUNK_HEADER_SIZE;
+                             script->pChunk->GetPos() -
+                             CHUNK_HEADER_SIZE(script->pChunk->GetFile()->GetFileOffsetSize())
+                         );
                          if (offset == soughtOffset)
                          {
                              _ScriptPooolRef ref;
-Line 4837 
 namespace {
+Line 5290 
 namespace {
       */
      void Instrument::RemoveScript(Script* pScript) {
          LoadScripts();
-         for (int i = pScriptRefs->size() - 1; i >= 0; --i) {
+         for (ssize_t i = pScriptRefs->size() - 1; i >= 0; --i) {
              if ((*pScriptRefs)[i].script == pScript) {
                  pScriptRefs->erase( pScriptRefs->begin() + i );
              }
-Line 4859 
 namespace {
+Line 5312 
 namespace {
       * gigedit.
       */
      uint Instrument::ScriptSlotCount() const {
-         return pScriptRefs ? pScriptRefs->size() : scriptPoolFileOffsets.size();
+         return uint(pScriptRefs ? pScriptRefs->size() : scriptPoolFileOffsets.size());
      }
      /** @brief Whether script execution shall be skipped.
-Line 4983 
 namespace {
+Line 5436 
 namespace {
          ::LoadString(pNameChunk, Name);
      }
+     /** @brief Destructor.
+      *
+      * Currently this destructor implementation does nothing.
+      */
      Group::~Group() {
-         // remove the chunk associated with this group (if any)
+     }
-         if (pNameChunk) pNameChunk->GetParent()->DeleteSubChunk(pNameChunk);
+     /** @brief Remove all RIFF chunks associated with this Group object.
+      *
+      * See DLS::Storage::DeleteChunks() for details.
+      */
+     void Group::DeleteChunks() {
+         // handle own RIFF chunks
+         if (pNameChunk) {
+             pNameChunk->GetParent()->DeleteSubChunk(pNameChunk);
+             pNameChunk = NULL;
+         }
      }
      /** @brief Update chunks with current group settings.
-Line 5008 
 namespace {
+Line 5475 
 namespace {
          RIFF::List* _3gnl = _3gri->GetSubList(LIST_TYPE_3GNL);
          if (!_3gnl) _3gnl = _3gri->AddSubList(LIST_TYPE_3GNL);
-         if (!pNameChunk && pFile->pVersion && pFile->pVersion->major == 3) {
+         if (!pNameChunk && pFile->pVersion && pFile->pVersion->major > 2) {
              // v3 has a fixed list of 128 strings, find a free one
              for (RIFF::Chunk* ck = _3gnl->GetFirstSubChunk() ; ck ; ck = _3gnl->GetNextSubChunk()) {
                  if (strcmp(static_cast<char*>(ck->LoadChunkData()), "") == 0) {
-Line 5103 
 namespace {
+Line 5570 
 namespace {
 , 3, 20030331 & 0xffff, 20030331 >> 16
      };
+     /// Reflects Gigasampler file format version 4.0 (2007-10-12).
+     const DLS::version_t File::VERSION_4 = {
+, 4, 20071012 & 0xffff, 20071012 >> 16
+     };
      static const DLS::Info::string_length_t _FileFixedStringLengths[] = {
          { CHUNK_ID_IARL, 256 },
          { CHUNK_ID_IART, 128 },
-Line 5199 
 namespace {
+Line 5671 
 namespace {
          return static_cast<gig::Sample*>( *it );
      }
+     /**
+      * Returns the total amount of samples of this gig file.
+      *
+      * Note that this method might block for a long time in case it is required
+      * to load the sample info for the first time.
+      *
+      * @returns total amount of samples
+      */
+     size_t File::CountSamples() {
+         if (!pSamples) LoadSamples();
+         if (!pSamples) return 0;
+         return pSamples->size();
+     }
      /** @brief Add a new sample.
       *
       * This will create a new Sample object for the gig file. You have to
-Line 5237 
 namespace {
+Line 5723 
 namespace {
          if (iter == pSamples->end()) throw gig::Exception("Could not delete sample, could not find given sample");
          if (SamplesIterator != pSamples->end() && *SamplesIterator == pSample) ++SamplesIterator; // avoid iterator invalidation
          pSamples->erase(iter);
+         pSample->DeleteChunks();
          delete pSample;
          SampleList::iterator tmp = SamplesIterator;
-Line 5274 
 namespace {
+Line 5761 
 namespace {
          int iSampleIndex  = 0;
          int iTotalSamples = WavePoolCount;
-         // check if samples should be loaded from extension files
+         // just for assembling path of optional extension files to be read
-         int lastFileNo = 0;
+         const std::string folder = parentPath(pRIFF->GetFileName());
-         for (int i = 0 ; i < WavePoolCount ; i++) {
+         const std::string baseName = pathWithoutExtension(pRIFF->GetFileName());
-             if (pWavePoolTableHi[i] > lastFileNo) lastFileNo = pWavePoolTableHi[i];
-         }
+         // the main gig file and the extension files (.gx01, ... , .gx98) may
-         String name(pRIFF->GetFileName());
+         // contain wave data (wave pool)
-         int nameLen = name.length();
+         std::vector<RIFF::File*> poolFiles;
-         char suffix[6];
+         poolFiles.push_back(pRIFF);
-         if (nameLen > 4 && name.substr(nameLen - 4) == ".gig") nameLen -= 4;
+         // get info about all extension files
-         for (int fileNo = 0 ; ; ) {
+         RIFF::Chunk* ckXfil = pRIFF->GetSubChunk(CHUNK_ID_XFIL);
+         if (ckXfil) { // there are extension files (.gx01, ... , .gx98) ...
+             const uint32_t n = ckXfil->ReadInt32();
+             for (int i = 0; i < n; i++) {
+                 // read the filename and load the extension file
+                 std::string name;
+                 ckXfil->ReadString(name, 128);
+                 std::string path = concatPath(folder, name);
+                 RIFF::File* pExtFile = new RIFF::File(path);
+                 // check that the dlsids match
+                 RIFF::Chunk* ckDLSID = pExtFile->GetSubChunk(CHUNK_ID_DLID);
+                 if (ckDLSID) {
+                     ::DLS::dlsid_t idExpected;
+                     idExpected.ulData1 = ckXfil->ReadInt32();
+                     idExpected.usData2 = ckXfil->ReadInt16();
+                     idExpected.usData3 = ckXfil->ReadInt16();
+                     ckXfil->Read(idExpected.abData, 8, 1);
+                     ::DLS::dlsid_t idFound;
+                     ckDLSID->Read(&idFound.ulData1, 1, 4);
+                     ckDLSID->Read(&idFound.usData2, 1, 2);
+                     ckDLSID->Read(&idFound.usData3, 1, 2);
+                     ckDLSID->Read(idFound.abData, 8, 1);
+                     if (memcmp(&idExpected, &idFound, 16) != 0)
+                         throw gig::Exception("dlsid mismatch for extension file: %s", path.c_str());
+                 }
+                 poolFiles.push_back(pExtFile);
+                 ExtensionFiles.push_back(pExtFile);
+             }
+         }
+         // check if a .gx99 (GigaPulse) file exists
+         RIFF::Chunk* ckDoxf = pRIFF->GetSubChunk(CHUNK_ID_DOXF);
+         if (ckDoxf) { // there is a .gx99 (GigaPulse) file ...
+             std::string path = baseName + ".gx99";
+             RIFF::File* pExtFile = new RIFF::File(path);
+             // skip unused int and filename
+             ckDoxf->SetPos(132, RIFF::stream_curpos);
+             // check that the dlsids match
+             RIFF::Chunk* ckDLSID = pExtFile->GetSubChunk(CHUNK_ID_DLID);
+             if (ckDLSID) {
+                 ::DLS::dlsid_t idExpected;
+                 idExpected.ulData1 = ckDoxf->ReadInt32();
+                 idExpected.usData2 = ckDoxf->ReadInt16();
+                 idExpected.usData3 = ckDoxf->ReadInt16();
+                 ckDoxf->Read(idExpected.abData, 8, 1);
+                 ::DLS::dlsid_t idFound;
+                 ckDLSID->Read(&idFound.ulData1, 1, 4);
+                 ckDLSID->Read(&idFound.usData2, 1, 2);
+                 ckDLSID->Read(&idFound.usData3, 1, 2);
+                 ckDLSID->Read(idFound.abData, 8, 1);
+                 if (memcmp(&idExpected, &idFound, 16) != 0)
+                     throw gig::Exception("dlsid mismatch for GigaPulse file: %s", path.c_str());
+             }
+             poolFiles.push_back(pExtFile);
+             ExtensionFiles.push_back(pExtFile);
+         }
+         // load samples from extension files (if required)
+         for (int i = 0; i < poolFiles.size(); i++) {
+             RIFF::File* file = poolFiles[i];
              RIFF::List* wvpl = file->GetSubList(LIST_TYPE_WVPL);
              if (wvpl) {
-                 unsigned long wvplFileOffset = wvpl->GetFilePos();
+                 file_offset_t wvplFileOffset = wvpl->GetFilePos() -
+                                                wvpl->GetPos(); // should be zero, but just to be sure
                  RIFF::List* wave = wvpl->GetFirstSubList();
                  while (wave) {
                      if (wave->GetListType() == LIST_TYPE_WAVE) {
-Line 5295 
 namespace {
+Line 5844 
 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));
+                         pSamples->push_back(new Sample(this, wave, waveFileOffset - wvplFileOffset, i, iSampleIndex));
                          iSampleIndex++;
                      }
                      wave = wvpl->GetNextSubList();
                  }
+             }
-                 if (fileNo == lastFileNo) break;
-                 // open extension file (*.gx01, *.gx02, ...)
-                 fileNo++;
-                 sprintf(suffix, ".gx%02d", fileNo);
-                 name.replace(nameLen, 5, suffix);
-                 file = new RIFF::File(name);
-                 ExtensionFiles.push_back(file);
-             } else break;
          }
          __notify_progress(pProgress, 1.0); // notify done
-Line 5331 
 namespace {
+Line 5871 
 namespace {
      }
      /**
+      * Returns the total amount of instruments of this gig file.
+      *
+      * Note that this method might block for a long time in case it is required
+      * to load the instruments info for the first time.
+      *
+      * @returns total amount of instruments
+      */
+     size_t File::CountInstruments() {
+         if (!pInstruments) LoadInstruments();
+         if (!pInstruments) return 0;
+         return pInstruments->size();
+     }
+     /**
       * Returns the instrument with the given index.
       *
       * @param index     - number of the sought instrument (0..n)
-Line 5449 
 namespace {
+Line 6003 
 namespace {
              mGroups[pFile->GetSample(i)->GetGroup()]->AddSample(s);
              mSamples[pFile->GetSample(i)] = s;
          }
+         // clone script groups and their scripts
+         for (int iGroup = 0; pFile->GetScriptGroup(iGroup); ++iGroup) {
+             ScriptGroup* sg = pFile->GetScriptGroup(iGroup);
+             ScriptGroup* dg = AddScriptGroup();
+             dg->Name = "COPY" + ToString(iCallCount) + "_" + sg->Name;
+             for (int iScript = 0; sg->GetScript(iScript); ++iScript) {
+                 Script* ss = sg->GetScript(iScript);
+                 Script* ds = dg->AddScript();
+                 ds->CopyAssign(ss);
+             }
+         }
          //BUG: For some reason this method only works with this additional
          //     Save() call in between here.
          //
-Line 5493 
 namespace {
+Line 6059 
 namespace {
          InstrumentList::iterator iter = find(pInstruments->begin(), pInstruments->end(), (DLS::Instrument*) pInstrument);
          if (iter == pInstruments->end()) throw gig::Exception("Could not delete instrument, could not find given instrument");
          pInstruments->erase(iter);
+         pInstrument->DeleteChunks();
          delete pInstrument;
      }
-Line 5534 
 namespace {
+Line 6101 
 namespace {
          if (!_3crc) return;
          // get the index of the sample
-         int iWaveIndex = -1;
+         int iWaveIndex = GetWaveTableIndexOf(pSample);
-         File::SampleList::iterator iter = pSamples->begin();
-         File::SampleList::iterator end  = pSamples->end();
-         for (int index = 0; iter != end; ++iter, ++index) {
-             if (*iter == pSample) {
-                 iWaveIndex = index;
-                 break;
-             }
-         }
          if (iWaveIndex < 0) throw gig::Exception("Could not update crc, could not find sample");
          // write the CRC-32 checksum to disk
          _3crc->SetPos(iWaveIndex * 8);
-         uint32_t tmp = 1;
+         uint32_t one = 1;
-         _3crc->WriteUint32(&tmp); // unknown, always 1?
+         _3crc->WriteUint32(&one); // always 1
          _3crc->WriteUint32(&crc);
      }
+     uint32_t File::GetSampleChecksum(Sample* pSample) {
+         // get the index of the sample
+         int iWaveIndex = GetWaveTableIndexOf(pSample);
+         if (iWaveIndex < 0) throw gig::Exception("Could not retrieve reference crc of sample, could not resolve sample's wave table index");
+         return GetSampleChecksumByIndex(iWaveIndex);
+     }
+     uint32_t File::GetSampleChecksumByIndex(int index) {
+         if (index < 0) throw gig::Exception("Could not retrieve reference crc of sample, invalid wave pool index of sample");
+         RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
+         if (!_3crc) throw gig::Exception("Could not retrieve reference crc of sample, no checksums stored for this file yet");
+         uint8_t* pData = (uint8_t*) _3crc->LoadChunkData();
+         if (!pData) throw gig::Exception("Could not retrieve reference crc of sample, no checksums stored for this file yet");
+         // read the CRC-32 checksum directly from disk
+         size_t pos = index * 8;
+         if (pos + 8 > _3crc->GetNewSize())
+             throw gig::Exception("Could not retrieve reference crc of sample, could not seek to required position in crc chunk");
+         uint32_t one = load32(&pData[pos]); // always 1
+         if (one != 1)
+             throw gig::Exception("Could not retrieve reference crc of sample, because reference checksum table is damaged");
+         return load32(&pData[pos+4]);
+     }
+     int File::GetWaveTableIndexOf(gig::Sample* pSample) {
+         if (!pSamples) GetFirstSample(); // make sure sample chunks were scanned
+         File::SampleList::iterator iter = pSamples->begin();
+         File::SampleList::iterator end  = pSamples->end();
+         for (int index = 0; iter != end; ++iter, ++index)
+             if (*iter == pSample)
+                 return index;
+         return -1;
+     }
+     /**
+      * Checks whether the file's "3CRC" chunk was damaged. This chunk contains
+      * the CRC32 check sums of all samples' raw wave data.
+      *
+      * @return true if 3CRC chunk is OK, or false if 3CRC chunk is damaged
+      */
+     bool File::VerifySampleChecksumTable() {
+         RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
+         if (!_3crc) return false;
+         if (_3crc->GetNewSize() <= 0) return false;
+         if (_3crc->GetNewSize() % 8) return false;
+         if (!pSamples) GetFirstSample(); // make sure sample chunks were scanned
+         if (_3crc->GetNewSize() != pSamples->size() * 8) return false;
+         const file_offset_t n = _3crc->GetNewSize() / 8;
+         uint32_t* pData = (uint32_t*) _3crc->LoadChunkData();
+         if (!pData) return false;
+         for (file_offset_t i = 0; i < n; ++i) {
+             uint32_t one = pData[i*2];
+             if (one != 1) return false;
+         }
+         return true;
+     }
+     /**
+      * Recalculates CRC32 checksums for all samples and rebuilds this gig
+      * file's checksum table with those new checksums. This might usually
+      * just be necessary if the checksum table was damaged.
+      *
+      * @e IMPORTANT: The current implementation of this method only works
+      * with files that have not been modified since it was loaded, because
+      * it expects that no externally caused file structure changes are
+      * required!
+      *
+      * Due to the expectation above, this method is currently protected
+      * and actually only used by the command line tool "gigdump" yet.
+      *
+      * @returns true if Save() is required to be called after this call,
+      *          false if no further action is required
+      */
+     bool File::RebuildSampleChecksumTable() {
+         // make sure sample chunks were scanned
+         if (!pSamples) GetFirstSample();
+         bool bRequiresSave = false;
+         // make sure "3CRC" chunk exists with required size
+         RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
+         if (!_3crc) {
+             _3crc = pRIFF->AddSubChunk(CHUNK_ID_3CRC, pSamples->size() * 8);
+             // the order of einf and 3crc is not the same in v2 and v3
+             RIFF::Chunk* einf = pRIFF->GetSubChunk(CHUNK_ID_EINF);
+             if (einf && pVersion && pVersion->major > 2) pRIFF->MoveSubChunk(_3crc, einf);
+             bRequiresSave = true;
+         } else if (_3crc->GetNewSize() != pSamples->size() * 8) {
+             _3crc->Resize(pSamples->size() * 8);
+             bRequiresSave = true;
+         }
+         if (bRequiresSave) { // refill CRC table for all samples in RAM ...
+             uint32_t* pData = (uint32_t*) _3crc->LoadChunkData();
+             {
+                 File::SampleList::iterator iter = pSamples->begin();
+                 File::SampleList::iterator end  = pSamples->end();
+                 for (; iter != end; ++iter) {
+                     gig::Sample* pSample = (gig::Sample*) *iter;
+                     int index = GetWaveTableIndexOf(pSample);
+                     if (index < 0) throw gig::Exception("Could not rebuild crc table for samples, wave table index of a sample could not be resolved");
+                     pData[index*2]   = 1; // always 1
+                     pData[index*2+1] = pSample->CalculateWaveDataChecksum();
+                 }
+             }
+         } else { // no file structure changes necessary, so directly write to disk and we are done ...
+             // make sure file is in write mode
+             pRIFF->SetMode(RIFF::stream_mode_read_write);
+             {
+                 File::SampleList::iterator iter = pSamples->begin();
+                 File::SampleList::iterator end  = pSamples->end();
+                 for (; iter != end; ++iter) {
+                     gig::Sample* pSample = (gig::Sample*) *iter;
+                     int index = GetWaveTableIndexOf(pSample);
+                     if (index < 0) throw gig::Exception("Could not rebuild crc table for samples, wave table index of a sample could not be resolved");
+                     pSample->crc  = pSample->CalculateWaveDataChecksum();
+                     SetSampleChecksum(pSample, pSample->crc);
+                 }
+             }
+         }
+         return bRequiresSave;
+     }
      Group* File::GetFirstGroup() {
          if (!pGroups) LoadGroups();
          // there must always be at least one group
-Line 5628 
 namespace {
+Line 6319 
 namespace {
          }
          // now delete this group object
          pGroups->erase(iter);
+         pGroup->DeleteChunks();
          delete pGroup;
      }
-Line 5649 
 namespace {
+Line 6341 
 namespace {
          // move all members of this group to another group
          pGroup->MoveAll();
          pGroups->erase(iter);
+         pGroup->DeleteChunks();
          delete pGroup;
      }
-Line 5662 
 namespace {
+Line 6355 
 namespace {
                  RIFF::Chunk* ck = lst3gnl->GetFirstSubChunk();
                  while (ck) {
                      if (ck->GetChunkID() == CHUNK_ID_3GNM) {
-                         if (pVersion && pVersion->major == 3 &&
+                         if (pVersion && pVersion->major > 2 &&
                              strcmp(static_cast<char*>(ck->LoadChunkData()), "") == 0) break;
                          pGroups->push_back(new Group(this, ck));
-Line 5748 
 namespace {
+Line 6441 
 namespace {
              pScriptGroup->DeleteScript(pScriptGroup->GetScript(i));
          if (pScriptGroup->pList)
              pScriptGroup->pList->GetParent()->DeleteSubChunk(pScriptGroup->pList);
+         pScriptGroup->DeleteChunks();
          delete pScriptGroup;
      }
-Line 5780 
 namespace {
+Line 6474 
 namespace {
      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 should be located
+         // before  the actual wave data
+         RIFF::Chunk* ckPTBL = pRIFF->GetSubChunk(CHUNK_ID_PTBL);
+         pRIFF->MoveSubChunk(lst3LS, ckPTBL);
          // 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) {
-             RIFF::List* lst3LS = pRIFF->GetSubList(LIST_TYPE_3LS);
+             // Update instrument script (group) chunks.
-             if (pScriptGroups->empty()) {
+             for (std::list<ScriptGroup*>::iterator it = pScriptGroups->begin();
-                 if (lst3LS) pRIFF->DeleteSubChunk(lst3LS);
+                  it != pScriptGroups->end(); ++it)
-             } else {
+             {
-                 if (!lst3LS) lst3LS = pRIFF->AddSubList(LIST_TYPE_3LS);
+                 (*it)->UpdateChunks(pProgress);
-                 // Update instrument script (group) chunks.
-                 for (std::list<ScriptGroup*>::iterator it = pScriptGroups->begin();
-                      it != pScriptGroups->end(); ++it)
-                 {
-                     (*it)->UpdateChunks(pProgress);
-                 }
              }
          }
+         // in case no libgig custom format data was added, then remove the
+         // custom "3LS " chunk again
+         if (!lst3LS->CountSubChunks()) {
+             pRIFF->DeleteSubChunk(lst3LS);
+             lst3LS = NULL;
+         }
          // first update base class's chunks
          DLS::File::UpdateChunks(pProgress);
-Line 5832 
 namespace {
+Line 6532 
 namespace {
              // v3: make sure the file has 128 3gnm chunks
              // (before updating the Group chunks)
-             if (pVersion && pVersion->major == 3) {
+             if (pVersion && pVersion->major > 2) {
                  RIFF::Chunk* _3gnm = _3gnl->GetFirstSubChunk();
                  for (int i = 0 ; i < 128 ; i++) {
                      if (i >= pGroups->size()) ::SaveString(CHUNK_ID_3GNM, _3gnm, _3gnl, "", "", true, 64);
-Line 5863 
 namespace {
+Line 6563 
 namespace {
          // Note that there are several fields with unknown use. These
          // are set to zero.
-         int sublen = pSamples->size() / 8 + 49;
+         int sublen = int(pSamples->size() / 8 + 49);
          int einfSize = (Instruments + 1) * sublen;
          RIFF::Chunk* einf = pRIFF->GetSubChunk(CHUNK_ID_EINF);
-Line 5936 
 namespace {
+Line 6636 
 namespace {
                  store32(&pData[(instrumentIdx + 1) * sublen + 24], nbloops);
                  // next 8 bytes unknown
                  store32(&pData[(instrumentIdx + 1) * sublen + 36], instrumentIdx);
-                 store32(&pData[(instrumentIdx + 1) * sublen + 40], pSamples->size());
+                 store32(&pData[(instrumentIdx + 1) * sublen + 40], (uint32_t) pSamples->size());
                  // next 4 bytes unknown
                  totnbregions += instrument->Regions;
-Line 5954 
 namespace {
+Line 6654 
 namespace {
              store32(&pData[24], totnbloops);
              // next 8 bytes unknown
              // next 4 bytes unknown, not always 0
-             store32(&pData[40], pSamples->size());
+             store32(&pData[40], (uint32_t) pSamples->size());
              // next 4 bytes unknown
          }
          // update 3crc chunk
          // The 3crc chunk contains CRC-32 checksums for the
-         // samples. The actual checksum values will be filled in
+         // samples. When saving a gig file to disk, we first update the 3CRC
-         // later, by Sample::Write.
+         // chunk here (in RAM) with the old crc values which we read from the
+         // 3CRC chunk when we opened the file (available with gig::Sample::crc
+         // member variable). This step is required, because samples might have
+         // been deleted by the user since the file was opened, which in turn
+         // changes the order of the (i.e. old) checksums within the 3crc chunk.
+         // If a sample was conciously modified by the user (that is if
+         // Sample::Write() was called later on) then Sample::Write() will just
+         // update the respective individual checksum(s) directly on disk and
+         // leaves all other sample checksums untouched.
          RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
          if (_3crc) {
              _3crc->Resize(pSamples->size() * 8);
-         } else if (newFile) {
+         } else /*if (newFile)*/ {
              _3crc = pRIFF->AddSubChunk(CHUNK_ID_3CRC, pSamples->size() * 8);
-             _3crc->LoadChunkData();
              // the order of einf and 3crc is not the same in v2 and v3
-             if (einf && pVersion && pVersion->major == 3) pRIFF->MoveSubChunk(_3crc, einf);
+             if (einf && pVersion && pVersion->major > 2) pRIFF->MoveSubChunk(_3crc, einf);
+         }
+         { // must be performed in RAM here ...
+             uint32_t* pData = (uint32_t*) _3crc->LoadChunkData();
+             if (pData) {
+                 File::SampleList::iterator iter = pSamples->begin();
+                 File::SampleList::iterator end  = pSamples->end();
+                 for (int index = 0; iter != end; ++iter, ++index) {
+                     gig::Sample* pSample = (gig::Sample*) *iter;
+                     pData[index*2]   = 1; // always 1
+                     pData[index*2+1] = pSample->crc;
+                 }
+             }
          }
      }
-Line 5987 
 namespace {
+Line 6705 
 namespace {
      }
      /**
-      * Enable / disable automatic loading. By default this properyt is
+      * Enable / disable automatic loading. By default this property is
-      * enabled and all informations are loaded automatically. However
+      * enabled and every information is loaded automatically. However
       * loading all Regions, DimensionRegions and especially samples might
       * take a long time for large .gig files, and sometimes one might only
       * be interested in retrieving very superficial informations like the
-Line 5996 
 namespace {
+Line 6714 
 namespace {
       * automatic loading to avoid very slow response times.
       *
       * @e CAUTION: by disabling this property many pointers (i.e. sample
-      * references) and informations will have invalid or even undefined
+      * references) and attributes will have invalid or even undefined
       * data! This feature is currently only intended for retrieving very
-      * superficial informations in a very fast way. Don't use it to retrieve
+      * superficial information in a very fast way. Don't use it to retrieve
-      * details like synthesis informations or even to modify .gig files!
+      * details like synthesis information or even to modify .gig files!
       */
      void File::SetAutoLoad(bool b) {
          bAutoLoad = b;
-Line 6018 
 namespace {
+Line 6736 
 namespace {
  // *************** Exception ***************
  // *
-     Exception::Exception(String Message) : DLS::Exception(Message) {
+     Exception::Exception() : DLS::Exception() {
+     }
+     Exception::Exception(String format, ...) : DLS::Exception() {
+         va_list arg;
+         va_start(arg, format);
+         Message = assemble(format, arg);
+         va_end(arg);
+     }
+     Exception::Exception(String format, va_list arg) : DLS::Exception() {
+         Message = assemble(format, arg);
      }
      void Exception::PrintMessage() {

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-Removed from v.2682
+Added in v.3481

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