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

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

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-revision 864 by persson,
Sun May 14 07:15:38 2006 UTC
+revision 1180 by persson,
Sat May 12 12:39:25 2007 UTC
 Line 1
  /***************************************************************************
   *                                                                         *
-  *   libgig - C++ cross-platform Gigasampler format file loader library    *
+  *   libgig - C++ cross-platform Gigasampler format file access library    *
   *                                                                         *
-  *   Copyright (C) 2003-2005 by Christian Schoenebeck                      *
+  *   Copyright (C) 2003-2007 by Christian Schoenebeck                      *
   *                              <cuse@users.sourceforge.net>               *
   *                                                                         *
   *   This library is free software; you can redistribute it and/or modify  *
 Line 111 
 namespace {
          return x & 0x800000 ? x - 0x1000000 : x;
      }
+     inline void store24(unsigned char* pDst, int x)
+     {
+         pDst[0] = x;
+         pDst[1] = x >> 8;
+         pDst[2] = x >> 16;
+     }
      void Decompress16(int compressionmode, const unsigned char* params,
                        int srcStep, int dstStep,
                        const unsigned char* pSrc, int16_t* pDst,
-Line 150 
 namespace {
+Line 157 
 namespace {
      }
      void Decompress24(int compressionmode, const unsigned char* params,
-                       int dstStep, const unsigned char* pSrc, int16_t* pDst,
+                       int dstStep, const unsigned char* pSrc, uint8_t* pDst,
                        unsigned long currentframeoffset,
                        unsigned long copysamples, int truncatedBits)
      {
-         // Note: The 24 bits are truncated to 16 bits for now.
          int y, dy, ddy, dddy;
-         const int shift = 8 - truncatedBits;
  #define GET_PARAMS(params)                      \
          y    = get24(params);                   \
-Line 173 
 namespace {
+Line 177 
 namespace {
  #define COPY_ONE(x)                             \
          SKIP_ONE(x);                            \
-         *pDst = y >> shift;                     \
+         store24(pDst, y << truncatedBits);      \
          pDst += dstStep
          switch (compressionmode) {
              case 2: // 24 bit uncompressed
                  pSrc += currentframeoffset * 3;
                  while (copysamples) {
-                     *pDst = get24(pSrc) >> shift;
+                     store24(pDst, get24(pSrc) << truncatedBits);
                      pDst += dstStep;
                      pSrc += 3;
                      copysamples--;
-Line 250 
 namespace {
+Line 254 
 namespace {
  }
+ // *************** Other Internal functions  ***************
+ // *
+     static split_type_t __resolveSplitType(dimension_t dimension) {
+         return (
+             dimension == dimension_layer ||
+             dimension == dimension_samplechannel ||
+             dimension == dimension_releasetrigger ||
+             dimension == dimension_keyboard ||
+             dimension == dimension_roundrobin ||
+             dimension == dimension_random ||
+             dimension == dimension_smartmidi ||
+             dimension == dimension_roundrobinkeyboard
+         ) ? split_type_bit : split_type_normal;
+     }
+     static int __resolveZoneSize(dimension_def_t& dimension_definition) {
+         return (dimension_definition.split_type == split_type_normal)
+         ? int(128.0 / dimension_definition.zones) : 0;
+     }
  // *************** Sample ***************
  // *
-Line 275 
 namespace {
+Line 303 
 namespace {
       *                         is located, 0 otherwise
       */
      Sample::Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset, unsigned long fileNo) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) {
+         static const DLS::Info::FixedStringLength fixedStringLengths[] = {
+             { CHUNK_ID_INAM, 64 },
+             { 0, 0 }
+         };
+         pInfo->FixedStringLengths = fixedStringLengths;
          Instances++;
          FileNo = fileNo;
          pCk3gix = waveList->GetSubChunk(CHUNK_ID_3GIX);
          if (pCk3gix) {
-             SampleGroup = pCk3gix->ReadInt16();
+             uint16_t iSampleGroup = pCk3gix->ReadInt16();
+             pGroup = pFile->GetGroup(iSampleGroup);
          } else { // '3gix' chunk missing
-             // use default value(s)
+             // by default assigned to that mandatory "Default Group"
-             SampleGroup = 0;
+             pGroup = pFile->GetGroup(0);
          }
          pCkSmpl = waveList->GetSubChunk(CHUNK_ID_SMPL);
-Line 307 
 namespace {
+Line 341 
 namespace {
              // use default values
              Manufacturer  = 0;
              Product       = 0;
-             SamplePeriod  = 1 / SamplesPerSecond;
+             SamplePeriod  = uint32_t(1000000000.0 / SamplesPerSecond + 0.5);
              MIDIUnityNote = 64;
              FineTune      = 0;
              SMPTEOffset   = 0;
-Line 358 
 namespace {
+Line 392 
 namespace {
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
       *
-      * @throws DLS::Exception if FormatTag != WAVE_FORMAT_PCM or no sample data
+      * @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
       */
-Line 371 
 namespace {
+Line 405 
 namespace {
          if (!pCkSmpl) pCkSmpl = pWaveList->AddSubChunk(CHUNK_ID_SMPL, 60);
          // update 'smpl' chunk
          uint8_t* pData = (uint8_t*) pCkSmpl->LoadChunkData();
-         SamplePeriod = 1 / SamplesPerSecond;
+         SamplePeriod = uint32_t(1000000000.0 / SamplesPerSecond + 0.5);
-         memcpy(&pData[0], &Manufacturer, 4);
+         store32(&pData[0], Manufacturer);
-         memcpy(&pData[4], &Product, 4);
+         store32(&pData[4], Product);
-         memcpy(&pData[8], &SamplePeriod, 4);
+         store32(&pData[8], SamplePeriod);
-         memcpy(&pData[12], &MIDIUnityNote, 4);
+         store32(&pData[12], MIDIUnityNote);
-         memcpy(&pData[16], &FineTune, 4);
+         store32(&pData[16], FineTune);
-         memcpy(&pData[20], &SMPTEFormat, 4);
+         store32(&pData[20], SMPTEFormat);
-         memcpy(&pData[24], &SMPTEOffset, 4);
+         store32(&pData[24], SMPTEOffset);
-         memcpy(&pData[28], &Loops, 4);
+         store32(&pData[28], Loops);
          // we skip 'manufByt' for now (4 bytes)
-         memcpy(&pData[36], &LoopID, 4);
+         store32(&pData[36], LoopID);
-         memcpy(&pData[40], &LoopType, 4);
+         store32(&pData[40], LoopType);
-         memcpy(&pData[44], &LoopStart, 4);
+         store32(&pData[44], LoopStart);
-         memcpy(&pData[48], &LoopEnd, 4);
+         store32(&pData[48], LoopEnd);
-         memcpy(&pData[52], &LoopFraction, 4);
+         store32(&pData[52], LoopFraction);
-         memcpy(&pData[56], &LoopPlayCount, 4);
+         store32(&pData[56], LoopPlayCount);
          // make sure '3gix' chunk exists
          pCk3gix = pWaveList->GetSubChunk(CHUNK_ID_3GIX);
          if (!pCk3gix) pCk3gix = pWaveList->AddSubChunk(CHUNK_ID_3GIX, 4);
+         // determine appropriate sample group index (to be stored in chunk)
+         uint16_t iSampleGroup = 0; // 0 refers to default sample group
+         File* pFile = static_cast<File*>(pParent);
+         if (pFile->pGroups) {
+             std::list<Group*>::iterator iter = pFile->pGroups->begin();
+             std::list<Group*>::iterator end  = pFile->pGroups->end();
+             for (int i = 0; iter != end; i++, iter++) {
+                 if (*iter == pGroup) {
+                     iSampleGroup = i;
+                     break; // found
+                 }
+             }
+         }
          // update '3gix' chunk
          pData = (uint8_t*) pCk3gix->LoadChunkData();
-         memcpy(&pData[0], &SampleGroup, 2);
+         store16(&pData[0], iSampleGroup);
      }
      /// Scans compressed samples for mandatory informations (e.g. actual number of total sample points).
-Line 616 
 namespace {
+Line 663 
 namespace {
       * enlarged samples before calling File::Save() as this might exceed the
       * current sample's boundary!
       *
-      * Also note: only WAVE_FORMAT_PCM is currently supported, that is
+      * Also note: only DLS_WAVE_FORMAT_PCM is currently supported, that is
-      * FormatTag must be WAVE_FORMAT_PCM. Trying to resize samples with
+      * 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
       *                   greater than zero)
-      * @throws DLS::Excecption if FormatTag != WAVE_FORMAT_PCM
+      * @throws DLS::Excecption if FormatTag != DLS_WAVE_FORMAT_PCM
       *                         or if \a iNewSize is less than 1
       * @throws gig::Exception if existing sample is compressed
       * @see DLS::Sample::GetSize(), DLS::Sample::FrameSize,
-Line 891 
 namespace {
+Line 938 
 namespace {
       * have to use an external decompression buffer for <b>EACH</b>
       * streaming thread to avoid race conditions and crashes!
       *
+      * For 16 bit samples, the data in the buffer will be int16_t
+      * (using native endianness). For 24 bit, the buffer will
+      * contain three bytes per sample, little-endian.
+      *
       * @param pBuffer      destination buffer
       * @param SampleCount  number of sample points to read
       * @param pExternalDecompressionBuffer  (optional) external buffer to use for decompression
-Line 901 
 namespace {
+Line 952 
 namespace {
          if (SampleCount == 0) return 0;
          if (!Compressed) {
              if (BitDepth == 24) {
-                 // 24 bit sample. For now just truncate to 16 bit.
+                 return pCkData->Read(pBuffer, SampleCount * FrameSize, 1) / FrameSize;
-                 unsigned char* pSrc = (unsigned char*) ((pExternalDecompressionBuffer) ? pExternalDecompressionBuffer->pStart : this->InternalDecompressionBuffer.pStart);
-                 int16_t* pDst = static_cast<int16_t*>(pBuffer);
-                 if (Channels == 2) { // Stereo
-                     unsigned long readBytes = pCkData->Read(pSrc, SampleCount * 6, 1);
-                     pSrc++;
-                     for (unsigned long i = readBytes ; i > 0 ; i -= 3) {
-                         *pDst++ = get16(pSrc);
-                         pSrc += 3;
-                     }
-                     return (pDst - static_cast<int16_t*>(pBuffer)) >> 1;
-                 }
-                 else { // Mono
-                     unsigned long readBytes = pCkData->Read(pSrc, SampleCount * 3, 1);
-                     pSrc++;
-                     for (unsigned long i = readBytes ; i > 0 ; i -= 3) {
-                         *pDst++ = get16(pSrc);
-                         pSrc += 3;
-                     }
-                     return pDst - static_cast<int16_t*>(pBuffer);
-                 }
              }
              else { // 16 bit
                  // (pCkData->Read does endian correction)
-Line 951 
 namespace {
+Line 982 
 namespace {
              unsigned char* pSrc = (unsigned char*) pDecompressionBuffer->pStart;
              int16_t* pDst = static_cast<int16_t*>(pBuffer);
+             uint8_t* pDst24 = static_cast<uint8_t*>(pBuffer);
              remainingbytes = pCkData->Read(pSrc, assumedsize, 1);
              while (remainingsamples && remainingbytes) {
-Line 1032 
 namespace {
+Line 1064 
 namespace {
                              const unsigned char* const param_r = pSrc;
                              if (mode_r != 2) pSrc += 12;
-                             Decompress24(mode_l, param_l, 2, pSrc, pDst,
+                             Decompress24(mode_l, param_l, 6, pSrc, pDst24,
                                           skipsamples, copysamples, TruncatedBits);
-                             Decompress24(mode_r, param_r, 2, pSrc + rightChannelOffset, pDst + 1,
+                             Decompress24(mode_r, param_r, 6, pSrc + rightChannelOffset, pDst24 + 3,
                                           skipsamples, copysamples, TruncatedBits);
-                             pDst += copysamples << 1;
+                             pDst24 += copysamples * 6;
                          }
                          else { // Mono
-                             Decompress24(mode_l, param_l, 1, pSrc, pDst,
+                             Decompress24(mode_l, param_l, 3, pSrc, pDst24,
                                           skipsamples, copysamples, TruncatedBits);
-                             pDst += copysamples;
+                             pDst24 += copysamples * 3;
                          }
                      }
                      else { // 16 bit
-Line 1148 
 namespace {
+Line 1180 
 namespace {
          }
      }
+     /**
+      * Returns pointer to the Group this Sample belongs to. In the .gig
+      * format a sample always belongs to one group. If it wasn't explicitly
+      * assigned to a certain group, it will be automatically assigned to a
+      * default group.
+      *
+      * @returns Sample's Group (never NULL)
+      */
+     Group* Sample::GetGroup() const {
+         return pGroup;
+     }
      Sample::~Sample() {
          Instances--;
          if (!Instances && InternalDecompressionBuffer.Size) {
-Line 1177 
 namespace {
+Line 1221 
 namespace {
          RIFF::Chunk* _3ewa = _3ewl->GetSubChunk(CHUNK_ID_3EWA);
          if (_3ewa) { // if '3ewa' chunk exists
-             _3ewa->ReadInt32(); // unknown, always 0x0000008C ?
+             _3ewa->ReadInt32(); // unknown, always == chunk size ?
              LFO3Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
              EG3Attack     = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
              _3ewa->ReadInt16(); // unknown
-Line 1322 
 namespace {
+Line 1366 
 namespace {
                  if (lfo3ctrl & 0x40) // bit 6
                      VCFType = vcf_type_lowpassturbo;
              }
+             if (_3ewa->RemainingBytes() >= 8) {
+                 _3ewa->Read(DimensionUpperLimits, 1, 8);
+             } else {
+                 memset(DimensionUpperLimits, 0, 8);
+             }
          } else { // '3ewa' chunk does not exist yet
              // use default values
              LFO3Frequency                   = 1.0;
-Line 1402 
 namespace {
+Line 1451 
 namespace {
              VCFVelocityDynamicRange         = 0x04;
              VCFVelocityCurve                = curve_type_linear;
              VCFType                         = vcf_type_lowpass;
+             memset(DimensionUpperLimits, 0, 8);
          }
          pVelocityAttenuationTable = GetVelocityTable(VelocityResponseCurve,
-Line 1457 
 namespace {
+Line 1507 
 namespace {
          // update '3ewa' chunk with DimensionRegion's current settings
-         const uint32_t unknown = 0x0000008C; // unknown, always 0x0000008C ?
+         const uint32_t chunksize = _3ewa->GetSize();
-         memcpy(&pData[0], &unknown, 4);
+         store32(&pData[0], chunksize); // unknown, always chunk size?
          const int32_t lfo3freq = (int32_t) GIG_EXP_ENCODE(LFO3Frequency);
-         memcpy(&pData[4], &lfo3freq, 4);
+         store32(&pData[4], lfo3freq);
          const int32_t eg3attack = (int32_t) GIG_EXP_ENCODE(EG3Attack);
-         memcpy(&pData[4], &eg3attack, 4);
+         store32(&pData[8], eg3attack);
          // next 2 bytes unknown
-         memcpy(&pData[10], &LFO1InternalDepth, 2);
+         store16(&pData[14], LFO1InternalDepth);
          // next 2 bytes unknown
-         memcpy(&pData[14], &LFO3InternalDepth, 2);
+         store16(&pData[18], LFO3InternalDepth);
          // next 2 bytes unknown
-         memcpy(&pData[18], &LFO1ControlDepth, 2);
+         store16(&pData[22], LFO1ControlDepth);
          // next 2 bytes unknown
-         memcpy(&pData[22], &LFO3ControlDepth, 2);
+         store16(&pData[26], LFO3ControlDepth);
          const int32_t eg1attack = (int32_t) GIG_EXP_ENCODE(EG1Attack);
-         memcpy(&pData[24], &eg1attack, 4);
+         store32(&pData[28], eg1attack);
          const int32_t eg1decay1 = (int32_t) GIG_EXP_ENCODE(EG1Decay1);
-         memcpy(&pData[28], &eg1decay1, 4);
+         store32(&pData[32], eg1decay1);
          // next 2 bytes unknown
-         memcpy(&pData[34], &EG1Sustain, 2);
+         store16(&pData[38], EG1Sustain);
          const int32_t eg1release = (int32_t) GIG_EXP_ENCODE(EG1Release);
-         memcpy(&pData[36], &eg1release, 4);
+         store32(&pData[40], eg1release);
          const uint8_t eg1ctl = (uint8_t) EncodeLeverageController(EG1Controller);
-         memcpy(&pData[40], &eg1ctl, 1);
+         pData[44] = eg1ctl;
          const uint8_t eg1ctrloptions =
              (EG1ControllerInvert) ? 0x01 : 0x00 |
              GIG_EG_CTR_ATTACK_INFLUENCE_ENCODE(EG1ControllerAttackInfluence) |
              GIG_EG_CTR_DECAY_INFLUENCE_ENCODE(EG1ControllerDecayInfluence) |
              GIG_EG_CTR_RELEASE_INFLUENCE_ENCODE(EG1ControllerReleaseInfluence);
-         memcpy(&pData[41], &eg1ctrloptions, 1);
+         pData[45] = eg1ctrloptions;
          const uint8_t eg2ctl = (uint8_t) EncodeLeverageController(EG2Controller);
-         memcpy(&pData[42], &eg2ctl, 1);
+         pData[46] = eg2ctl;
          const uint8_t eg2ctrloptions =
              (EG2ControllerInvert) ? 0x01 : 0x00 |
              GIG_EG_CTR_ATTACK_INFLUENCE_ENCODE(EG2ControllerAttackInfluence) |
              GIG_EG_CTR_DECAY_INFLUENCE_ENCODE(EG2ControllerDecayInfluence) |
              GIG_EG_CTR_RELEASE_INFLUENCE_ENCODE(EG2ControllerReleaseInfluence);
-         memcpy(&pData[43], &eg2ctrloptions, 1);
+         pData[47] = eg2ctrloptions;
          const int32_t lfo1freq = (int32_t) GIG_EXP_ENCODE(LFO1Frequency);
-         memcpy(&pData[44], &lfo1freq, 4);
+         store32(&pData[48], lfo1freq);
          const int32_t eg2attack = (int32_t) GIG_EXP_ENCODE(EG2Attack);
-         memcpy(&pData[48], &eg2attack, 4);
+         store32(&pData[52], eg2attack);
          const int32_t eg2decay1 = (int32_t) GIG_EXP_ENCODE(EG2Decay1);
-         memcpy(&pData[52], &eg2decay1, 4);
+         store32(&pData[56], eg2decay1);
          // next 2 bytes unknown
-         memcpy(&pData[58], &EG2Sustain, 2);
+         store16(&pData[62], EG2Sustain);
          const int32_t eg2release = (int32_t) GIG_EXP_ENCODE(EG2Release);
-         memcpy(&pData[60], &eg2release, 4);
+         store32(&pData[64], eg2release);
          // next 2 bytes unknown
-         memcpy(&pData[66], &LFO2ControlDepth, 2);
+         store16(&pData[70], LFO2ControlDepth);
          const int32_t lfo2freq = (int32_t) GIG_EXP_ENCODE(LFO2Frequency);
-         memcpy(&pData[68], &lfo2freq, 4);
+         store32(&pData[72], lfo2freq);
          // next 2 bytes unknown
-         memcpy(&pData[72], &LFO2InternalDepth, 2);
+         store16(&pData[78], LFO2InternalDepth);
          const int32_t eg1decay2 = (int32_t) (EG1InfiniteSustain) ? 0x7fffffff : (int32_t) GIG_EXP_ENCODE(EG1Decay2);
-         memcpy(&pData[74], &eg1decay2, 4);
+         store32(&pData[80], eg1decay2);
          // next 2 bytes unknown
-         memcpy(&pData[80], &EG1PreAttack, 2);
+         store16(&pData[86], EG1PreAttack);
          const int32_t eg2decay2 = (int32_t) (EG2InfiniteSustain) ? 0x7fffffff : (int32_t) GIG_EXP_ENCODE(EG2Decay2);
-         memcpy(&pData[82], &eg2decay2, 4);
+         store32(&pData[88], eg2decay2);
          // next 2 bytes unknown
-         memcpy(&pData[88], &EG2PreAttack, 2);
+         store16(&pData[94], EG2PreAttack);
          {
              if (VelocityResponseDepth > 4) throw Exception("VelocityResponseDepth must be between 0 and 4");
-Line 1572 
 namespace {
+Line 1622 
 namespace {
                  default:
                      throw Exception("Could not update DimensionRegion's chunk, unknown VelocityResponseCurve selected");
              }
-             memcpy(&pData[90], &velocityresponse, 1);
+             pData[96] = velocityresponse;
          }
          {
-Line 1591 
 namespace {
+Line 1641 
 namespace {
                  default:
                      throw Exception("Could not update DimensionRegion's chunk, unknown ReleaseVelocityResponseCurve selected");
              }
-             memcpy(&pData[91], &releasevelocityresponse, 1);
+             pData[97] = releasevelocityresponse;
          }
-         memcpy(&pData[92], &VelocityResponseCurveScaling, 1);
+         pData[98] = VelocityResponseCurveScaling;
-         memcpy(&pData[93], &AttenuationControllerThreshold, 1);
+         pData[99] = AttenuationControllerThreshold;
          // next 4 bytes unknown
-         memcpy(&pData[98], &SampleStartOffset, 2);
+         store16(&pData[104], SampleStartOffset);
          // next 2 bytes unknown
-Line 1619 
 namespace {
+Line 1669 
 namespace {
                  default:
                      throw Exception("Could not update DimensionRegion's chunk, unknown DimensionBypass selected");
              }
-             memcpy(&pData[102], &pitchTrackDimensionBypass, 1);
+             pData[108] = pitchTrackDimensionBypass;
          }
          const uint8_t pan = (Pan >= 0) ? Pan : ((-Pan) + 63); // signed 8 bit -> signed 7 bit
-         memcpy(&pData[103], &pan, 1);
+         pData[109] = pan;
          const uint8_t selfmask = (SelfMask) ? 0x01 : 0x00;
-         memcpy(&pData[104], &selfmask, 1);
+         pData[110] = selfmask;
          // next byte unknown
-Line 1635 
 namespace {
+Line 1685 
 namespace {
              if (LFO3Sync) lfo3ctrl |= 0x20; // bit 5
              if (InvertAttenuationController) lfo3ctrl |= 0x80; // bit 7
              if (VCFType == vcf_type_lowpassturbo) lfo3ctrl |= 0x40; // bit 6
-             memcpy(&pData[106], &lfo3ctrl, 1);
+             pData[112] = lfo3ctrl;
          }
          const uint8_t attenctl = EncodeLeverageController(AttenuationController);
-         memcpy(&pData[107], &attenctl, 1);
+         pData[113] = attenctl;
          {
              uint8_t lfo2ctrl = LFO2Controller & 0x07; // lower 3 bits
              if (LFO2FlipPhase) lfo2ctrl |= 0x80; // bit 7
              if (LFO2Sync)      lfo2ctrl |= 0x20; // bit 5
              if (VCFResonanceController != vcf_res_ctrl_none) lfo2ctrl |= 0x40; // bit 6
-             memcpy(&pData[108], &lfo2ctrl, 1);
+             pData[114] = lfo2ctrl;
          }
          {
-Line 1655 
 namespace {
+Line 1705 
 namespace {
              if (LFO1Sync)      lfo1ctrl |= 0x40; // bit 6
              if (VCFResonanceController != vcf_res_ctrl_none)
                  lfo1ctrl |= GIG_VCF_RESONANCE_CTRL_ENCODE(VCFResonanceController);
-             memcpy(&pData[109], &lfo1ctrl, 1);
+             pData[115] = lfo1ctrl;
          }
          const uint16_t eg3depth = (EG3Depth >= 0) ? EG3Depth
                                                    : uint16_t(((-EG3Depth) - 1) ^ 0xffff); /* binary complementary for negatives */
-         memcpy(&pData[110], &eg3depth, 1);
+         pData[116] = eg3depth;
          // next 2 bytes unknown
          const uint8_t channeloffset = ChannelOffset * 4;
-         memcpy(&pData[113], &channeloffset, 1);
+         pData[120] = channeloffset;
          {
              uint8_t regoptions = 0;
              if (MSDecode)      regoptions |= 0x01; // bit 0
              if (SustainDefeat) regoptions |= 0x02; // bit 1
-             memcpy(&pData[114], &regoptions, 1);
+             pData[121] = regoptions;
          }
          // next 2 bytes unknown
-         memcpy(&pData[117], &VelocityUpperLimit, 1);
+         pData[124] = VelocityUpperLimit;
          // next 3 bytes unknown
-         memcpy(&pData[121], &ReleaseTriggerDecay, 1);
+         pData[128] = ReleaseTriggerDecay;
          // next 2 bytes unknown
          const uint8_t eg1hold = (EG1Hold) ? 0x80 : 0x00; // bit 7
-         memcpy(&pData[124], &eg1hold, 1);
+         pData[131] = eg1hold;
          const uint8_t vcfcutoff = (VCFEnabled) ? 0x80 : 0x00 |  /* bit 7 */
-                                   (VCFCutoff)  ? 0x7f : 0x00;   /* lower 7 bits */
+                                   (VCFCutoff & 0x7f);   /* lower 7 bits */
-         memcpy(&pData[125], &vcfcutoff, 1);
+         pData[132] = vcfcutoff;
-         memcpy(&pData[126], &VCFCutoffController, 1);
+         pData[133] = VCFCutoffController;
          const uint8_t vcfvelscale = (VCFCutoffControllerInvert) ? 0x80 : 0x00 | /* bit 7 */
-                                     (VCFVelocityScale) ? 0x7f : 0x00; /* lower 7 bits */
+                                     (VCFVelocityScale & 0x7f); /* lower 7 bits */
-         memcpy(&pData[127], &vcfvelscale, 1);
+         pData[134] = vcfvelscale;
          // next byte unknown
          const uint8_t vcfresonance = (VCFResonanceDynamic) ? 0x00 : 0x80 | /* bit 7 */
-                                      (VCFResonance) ? 0x7f : 0x00; /* lower 7 bits */
+                                      (VCFResonance & 0x7f); /* lower 7 bits */
-         memcpy(&pData[129], &vcfresonance, 1);
+         pData[136] = vcfresonance;
          const uint8_t vcfbreakpoint = (VCFKeyboardTracking) ? 0x80 : 0x00 | /* bit 7 */
-                                       (VCFKeyboardTrackingBreakpoint) ? 0x7f : 0x00; /* lower 7 bits */
+                                       (VCFKeyboardTrackingBreakpoint & 0x7f); /* lower 7 bits */
-         memcpy(&pData[130], &vcfbreakpoint, 1);
+         pData[137] = vcfbreakpoint;
          const uint8_t vcfvelocity = VCFVelocityDynamicRange % 5 |
                                      VCFVelocityCurve * 5;
-         memcpy(&pData[131], &vcfvelocity, 1);
+         pData[138] = vcfvelocity;
          const uint8_t vcftype = (VCFType == vcf_type_lowpassturbo) ? vcf_type_lowpass : VCFType;
-         memcpy(&pData[132], &vcftype, 1);
+         pData[139] = vcftype;
+         if (chunksize >= 148) {
+             memcpy(&pData[140], DimensionUpperLimits, 8);
+         }
      }
      // get the corresponding velocity table from the table map or create & calculate that table if it doesn't exist yet
-Line 2087 
 namespace {
+Line 2141 
 namespace {
                      pDimensionDefinitions[i].dimension = dimension;
                      pDimensionDefinitions[i].bits      = bits;
                      pDimensionDefinitions[i].zones     = zones ? zones : 0x01 << bits; // = pow(2,bits)
-                     pDimensionDefinitions[i].split_type = (dimension == dimension_layer ||
+                     pDimensionDefinitions[i].split_type = __resolveSplitType(dimension);
-                                                            dimension == dimension_samplechannel ||
+                     pDimensionDefinitions[i].zone_size  = __resolveZoneSize(pDimensionDefinitions[i]);
-                                                            dimension == dimension_releasetrigger ||
-                                                            dimension == dimension_keyboard ||
-                                                            dimension == dimension_roundrobin ||
-                                                            dimension == dimension_random) ? split_type_bit
-                                                                                           : split_type_normal;
-                     pDimensionDefinitions[i].zone_size  =
-                         (pDimensionDefinitions[i].split_type == split_type_normal) ? 128.0 / pDimensionDefinitions[i].zones
-                                                                                    : 0;
                      Dimensions++;
                      // if this is a layer dimension, remember the amount of layers
-Line 2119 
 namespace {
+Line 2165 
 namespace {
              // load sample references
              for (uint i = 0; i < DimensionRegions; i++) {
                  uint32_t wavepoolindex = _3lnk->ReadUint32();
-                 pDimensionRegions[i]->pSample = GetSampleFromWavePool(wavepoolindex);
+                 if (file->pWavePoolTable) pDimensionRegions[i]->pSample = GetSampleFromWavePool(wavepoolindex);
              }
+             GetSample(); // load global region sample reference
+         } else {
+             DimensionRegions = 0;
          }
          // make sure there is at least one dimension region
-Line 2143 
 namespace {
+Line 2192 
 namespace {
       * @throws gig::Exception if samples cannot be dereferenced
       */
      void Region::UpdateChunks() {
+         // 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
+         // the first dimension region of this region
+         pSample = pDimensionRegions[0]->pSample;
          // first update base class's chunks
          DLS::Region::UpdateChunks();
-Line 2164 
 namespace {
+Line 2219 
 namespace {
          // update dimension definitions in '3lnk' chunk
          uint8_t* pData = (uint8_t*) _3lnk->LoadChunkData();
+         store32(&pData[0], DimensionRegions);
          for (int i = 0; i < iMaxDimensions; i++) {
-             pData[i * 8]     = (uint8_t) pDimensionDefinitions[i].dimension;
+             pData[4 + i * 8] = (uint8_t) pDimensionDefinitions[i].dimension;
-             pData[i * 8 + 1] = pDimensionDefinitions[i].bits;
+             pData[5 + i * 8] = pDimensionDefinitions[i].bits;
              // next 2 bytes unknown
-             pData[i * 8 + 4] = pDimensionDefinitions[i].zones;
+             pData[8 + i * 8] = pDimensionDefinitions[i].zones;
              // next 3 bytes unknown
          }
-Line 2188 
 namespace {
+Line 2244 
 namespace {
                  }
                  if (iWaveIndex < 0) throw gig::Exception("Could not update gig::Region, could not find DimensionRegion's sample");
              }
-             memcpy(&pData[iWavePoolOffset + i * 4], &iWaveIndex, 4);
+             store32(&pData[iWavePoolOffset + i * 4], iWaveIndex);
          }
      }
-Line 2228 
 namespace {
+Line 2284 
 namespace {
          int dim[8] = { 0 };
          for (int i = 0 ; i < DimensionRegions ; i++) {
-             if (pDimensionRegions[i]->VelocityUpperLimit) {
+             if (pDimensionRegions[i]->DimensionUpperLimits[veldim] ||
+                 pDimensionRegions[i]->VelocityUpperLimit) {
                  // create the velocity table
                  uint8_t* table = pDimensionRegions[i]->VelocityTable;
                  if (!table) {
-Line 2237 
 namespace {
+Line 2294 
 namespace {
                  }
                  int tableidx = 0;
                  int velocityZone = 0;
-                 for (int k = i ; k < end ; k += step) {
+                 if (pDimensionRegions[i]->DimensionUpperLimits[veldim]) { // gig3
-                     DimensionRegion *d = pDimensionRegions[k];
+                     for (int k = i ; k < end ; k += step) {
-                     for (; tableidx <= d->VelocityUpperLimit ; tableidx++) table[tableidx] = velocityZone;
+                         DimensionRegion *d = pDimensionRegions[k];
-                     velocityZone++;
+                         for (; tableidx <= d->DimensionUpperLimits[veldim] ; tableidx++) table[tableidx] = velocityZone;
+                         velocityZone++;
+                     }
+                 } else { // gig2
+                     for (int k = i ; k < end ; k += step) {
+                         DimensionRegion *d = pDimensionRegions[k];
+                         for (; tableidx <= d->VelocityUpperLimit ; tableidx++) table[tableidx] = velocityZone;
+                         velocityZone++;
+                     }
                  }
              } else {
                  if (pDimensionRegions[i]->VelocityTable) {
-Line 2307 
 namespace {
+Line 2372 
 namespace {
          // assign definition of new dimension
          pDimensionDefinitions[Dimensions] = *pDimDef;
+         // auto correct certain dimension definition fields (where possible)
+         pDimensionDefinitions[Dimensions].split_type  =
+             __resolveSplitType(pDimensionDefinitions[Dimensions].dimension);
+         pDimensionDefinitions[Dimensions].zone_size =
+             __resolveZoneSize(pDimensionDefinitions[Dimensions]);
          // create new dimension region(s) for this new dimension
          for (int i = 1 << iCurrentBits; i < 1 << iNewBits; i++) {
              //TODO: maybe we should copy existing dimension regions if possible instead of simply creating new ones with default values
-Line 2435 
 namespace {
+Line 2506 
 namespace {
              } else {
                  switch (pDimensionDefinitions[i].split_type) {
                      case split_type_normal:
-                         bits = uint8_t(DimValues[i] / pDimensionDefinitions[i].zone_size);
+                         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;
-Line 2449 
 namespace {
+Line 2528 
 namespace {
          DimensionRegion* dimreg = pDimensionRegions[dimregidx];
          if (veldim != -1) {
              // (dimreg is now the dimension region for the lowest velocity)
-             if (dimreg->VelocityUpperLimit) // custom defined zone ranges
+             if (dimreg->VelocityTable) // custom defined zone ranges
                  bits = dimreg->VelocityTable[DimValues[veldim]];
              else // normal split type
                  bits = uint8_t(DimValues[veldim] / pDimensionDefinitions[veldim].zone_size);
-Line 2497 
 namespace {
+Line 2576 
 namespace {
      Sample* Region::GetSampleFromWavePool(unsigned int WavePoolTableIndex, progress_t* pProgress) {
          if ((int32_t)WavePoolTableIndex == -1) return NULL;
          File* file = (File*) GetParent()->GetParent();
+         if (!file->pWavePoolTable) return NULL;
          unsigned long soughtoffset = file->pWavePoolTable[WavePoolTableIndex];
          unsigned long soughtfileno = file->pWavePoolTableHi[WavePoolTableIndex];
          Sample* sample = file->GetFirstSample(pProgress);
          while (sample) {
              if (sample->ulWavePoolOffset == soughtoffset &&
-                 sample->FileNo == soughtfileno) return static_cast<gig::Sample*>(pSample = sample);
+                 sample->FileNo == soughtfileno) return static_cast<gig::Sample*>(sample);
              sample = file->GetNextSample();
          }
          return NULL;
-Line 2514 
 namespace {
+Line 2594 
 namespace {
  // *
      Instrument::Instrument(File* pFile, RIFF::List* insList, progress_t* pProgress) : DLS::Instrument((DLS::File*)pFile, insList) {
+         static const DLS::Info::FixedStringLength fixedStringLengths[] = {
+             { CHUNK_ID_INAM, 64 },
+             { CHUNK_ID_ISFT, 12 },
+             { 0, 0 }
+         };
+         pInfo->FixedStringLengths = fixedStringLengths;
          // Initialization
          for (int i = 0; i < 128; i++) RegionKeyTable[i] = NULL;
-Line 2594 
 namespace {
+Line 2681 
 namespace {
          if (!_3ewg)  _3ewg = lart->AddSubChunk(CHUNK_ID_3EWG, 12);
          // update '3ewg' RIFF chunk
          uint8_t* pData = (uint8_t*) _3ewg->LoadChunkData();
-         memcpy(&pData[0], &EffectSend, 2);
+         store16(&pData[0], EffectSend);
-         memcpy(&pData[2], &Attenuation, 4);
+         store32(&pData[2], Attenuation);
-         memcpy(&pData[6], &FineTune, 2);
+         store16(&pData[6], FineTune);
-         memcpy(&pData[8], &PitchbendRange, 2);
+         store16(&pData[8], PitchbendRange);
          const uint8_t dimkeystart = (PianoReleaseMode) ? 0x01 : 0x00 |
                                      DimensionKeyRange.low << 1;
-         memcpy(&pData[10], &dimkeystart, 1);
+         pData[10] = dimkeystart;
-         memcpy(&pData[11], &DimensionKeyRange.high, 1);
+         pData[11] = DimensionKeyRange.high;
      }
      /**
-Line 2672 
 namespace {
+Line 2759 
 namespace {
+ // *************** Group ***************
+ // *
+     /** @brief Constructor.
+      *
+      * @param file   - pointer to the gig::File object
+      * @param ck3gnm - pointer to 3gnm chunk associated with this group or
+      *                 NULL if this is a new Group
+      */
+     Group::Group(File* file, RIFF::Chunk* ck3gnm) {
+         pFile      = file;
+         pNameChunk = ck3gnm;
+         ::LoadString(pNameChunk, Name);
+     }
+     Group::~Group() {
+         // remove the chunk associated with this group (if any)
+         if (pNameChunk) pNameChunk->GetParent()->DeleteSubChunk(pNameChunk);
+     }
+     /** @brief Update chunks with current group settings.
+      *
+      * Apply current Group field values to the respective 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.
+      */
+     void Group::UpdateChunks() {
+         // make sure <3gri> and <3gnl> list chunks exist
+         RIFF::List* _3gri = pFile->pRIFF->GetSubList(LIST_TYPE_3GRI);
+         if (!_3gri) _3gri = pFile->pRIFF->AddSubList(LIST_TYPE_3GRI);
+         RIFF::List* _3gnl = _3gri->GetSubList(LIST_TYPE_3GNL);
+         if (!_3gnl) _3gnl = pFile->pRIFF->AddSubList(LIST_TYPE_3GNL);
+         // now store the name of this group as <3gnm> chunk as subchunk of the <3gnl> list chunk
+         ::SaveString(CHUNK_ID_3GNM, pNameChunk, _3gnl, Name, String("Unnamed Group"), true, 64);
+     }
+     /**
+      * Returns the first Sample of this Group. You have to call this method
+      * once before you use GetNextSample().
+      *
+      * <b>Notice:</b> this method might block for a long time, in case the
+      * samples of this .gig file were not scanned yet
+      *
+      * @returns  pointer address to first Sample or NULL if there is none
+      *           applied to this Group
+      * @see      GetNextSample()
+      */
+     Sample* Group::GetFirstSample() {
+         // FIXME: lazy und unsafe implementation, should be an autonomous iterator
+         for (Sample* pSample = pFile->GetFirstSample(); pSample; pSample = pFile->GetNextSample()) {
+             if (pSample->GetGroup() == this) return pSample;
+         }
+         return NULL;
+     }
+     /**
+      * Returns the next Sample of the Group. You have to call
+      * GetFirstSample() once before you can use this method. By calling this
+      * method multiple times it iterates through the Samples assigned to
+      * this Group.
+      *
+      * @returns  pointer address to the next Sample of this Group or NULL if
+      *           end reached
+      * @see      GetFirstSample()
+      */
+     Sample* Group::GetNextSample() {
+         // FIXME: lazy und unsafe implementation, should be an autonomous iterator
+         for (Sample* pSample = pFile->GetNextSample(); pSample; pSample = pFile->GetNextSample()) {
+             if (pSample->GetGroup() == this) return pSample;
+         }
+         return NULL;
+     }
+     /**
+      * Move Sample given by \a pSample from another Group to this Group.
+      */
+     void Group::AddSample(Sample* pSample) {
+         pSample->pGroup = this;
+     }
+     /**
+      * Move all members of this group to another group (preferably the 1st
+      * one except this). This method is called explicitly by
+      * File::DeleteGroup() thus when a Group was deleted. This code was
+      * intentionally not placed in the destructor!
+      */
+     void Group::MoveAll() {
+         // get "that" other group first
+         Group* pOtherGroup = NULL;
+         for (pOtherGroup = pFile->GetFirstGroup(); pOtherGroup; pOtherGroup = pFile->GetNextGroup()) {
+             if (pOtherGroup != this) break;
+         }
+         if (!pOtherGroup) throw Exception(
+             "Could not move samples to another group, since there is no "
+             "other Group. This is a bug, report it!"
+         );
+         // now move all samples of this group to the other group
+         for (Sample* pSample = GetFirstSample(); pSample; pSample = GetNextSample()) {
+             pOtherGroup->AddSample(pSample);
+         }
+     }
  // *************** File ***************
  // *
+     const DLS::Info::FixedStringLength File::FixedStringLengths[] = {
+         { CHUNK_ID_IARL, 256 },
+         { CHUNK_ID_IART, 128 },
+         { CHUNK_ID_ICMS, 128 },
+         { CHUNK_ID_ICMT, 1024 },
+         { CHUNK_ID_ICOP, 128 },
+         { CHUNK_ID_ICRD, 128 },
+         { CHUNK_ID_IENG, 128 },
+         { CHUNK_ID_IGNR, 128 },
+         { CHUNK_ID_IKEY, 128 },
+         { CHUNK_ID_IMED, 128 },
+         { CHUNK_ID_INAM, 128 },
+         { CHUNK_ID_IPRD, 128 },
+         { CHUNK_ID_ISBJ, 128 },
+         { CHUNK_ID_ISFT, 128 },
+         { CHUNK_ID_ISRC, 128 },
+         { CHUNK_ID_ISRF, 128 },
+         { CHUNK_ID_ITCH, 128 },
+         { 0, 0 }
+     };
      File::File() : DLS::File() {
+         pGroups = NULL;
+         pInfo->FixedStringLengths = FixedStringLengths;
      }
      File::File(RIFF::File* pRIFF) : DLS::File(pRIFF) {
+         pGroups = NULL;
+         pInfo->FixedStringLengths = FixedStringLengths;
+     }
+     File::~File() {
+         if (pGroups) {
+             std::list<Group*>::iterator iter = pGroups->begin();
+             std::list<Group*>::iterator end  = pGroups->end();
+             while (iter != end) {
+                 delete *iter;
+                 ++iter;
+             }
+             delete pGroups;
+         }
      }
      Sample* File::GetFirstSample(progress_t* pProgress) {
-Line 2724 
 namespace {
+Line 2954 
 namespace {
          if (!pSamples || !pSamples->size()) throw gig::Exception("Could not delete sample as there are no samples");
          SampleList::iterator iter = find(pSamples->begin(), pSamples->end(), (DLS::Sample*) pSample);
          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);
          delete pSample;
      }
-Line 2733 
 namespace {
+Line 2964 
 namespace {
      }
      void File::LoadSamples(progress_t* pProgress) {
+         // Groups must be loaded before samples, because samples will try
+         // to resolve the group they belong to
+         if (!pGroups) LoadGroups();
          if (!pSamples) pSamples = new SampleList;
          RIFF::File* file = pRIFF;
-Line 2856 
 namespace {
+Line 3091 
 namespace {
       * have to call Save() to make this persistent to the file.
       *
       * @param pInstrument - instrument to delete
-      * @throws gig::Excption if given instrument could not be found
+      * @throws gig::Exception if given instrument could not be found
       */
      void File::DeleteInstrument(Instrument* pInstrument) {
          if (!pInstruments) throw gig::Exception("Could not delete instrument as there are no instruments");
-Line 2896 
 namespace {
+Line 3131 
 namespace {
          }
      }
+     Group* File::GetFirstGroup() {
+         if (!pGroups) LoadGroups();
+         // there must always be at least one group
+         GroupsIterator = pGroups->begin();
+         return *GroupsIterator;
+     }
+     Group* File::GetNextGroup() {
+         if (!pGroups) return NULL;
+         ++GroupsIterator;
+         return (GroupsIterator == pGroups->end()) ? NULL : *GroupsIterator;
+     }
+     /**
+      * Returns the group with the given index.
+      *
+      * @param index - number of the sought group (0..n)
+      * @returns sought group or NULL if there's no such group
+      */
+     Group* File::GetGroup(uint index) {
+         if (!pGroups) LoadGroups();
+         GroupsIterator = pGroups->begin();
+         for (uint i = 0; GroupsIterator != pGroups->end(); i++) {
+             if (i == index) return *GroupsIterator;
+             ++GroupsIterator;
+         }
+         return NULL;
+     }
+     Group* File::AddGroup() {
+         if (!pGroups) LoadGroups();
+         // there must always be at least one group
+         __ensureMandatoryChunksExist();
+         Group* pGroup = new Group(this, NULL);
+         pGroups->push_back(pGroup);
+         return pGroup;
+     }
+     /** @brief Delete a group and its samples.
+      *
+      * This will delete the given Group object and all the samples that
+      * belong to this group from the gig file. You have to call Save() to
+      * make this persistent to the file.
+      *
+      * @param pGroup - group to delete
+      * @throws gig::Exception if given group could not be found
+      */
+     void File::DeleteGroup(Group* pGroup) {
+         if (!pGroups) LoadGroups();
+         std::list<Group*>::iterator iter = find(pGroups->begin(), pGroups->end(), pGroup);
+         if (iter == pGroups->end()) throw gig::Exception("Could not delete group, could not find given group");
+         if (pGroups->size() == 1) throw gig::Exception("Cannot delete group, there must be at least one default group!");
+         // delete all members of this group
+         for (Sample* pSample = pGroup->GetFirstSample(); pSample; pSample = pGroup->GetNextSample()) {
+             DeleteSample(pSample);
+         }
+         // now delete this group object
+         pGroups->erase(iter);
+         delete pGroup;
+     }
+     /** @brief Delete a group.
+      *
+      * This will delete the given Group object from the gig file. All the
+      * samples that belong to this group will not be deleted, but instead
+      * be moved to another group. You have to call Save() to make this
+      * persistent to the file.
+      *
+      * @param pGroup - group to delete
+      * @throws gig::Exception if given group could not be found
+      */
+     void File::DeleteGroupOnly(Group* pGroup) {
+         if (!pGroups) LoadGroups();
+         std::list<Group*>::iterator iter = find(pGroups->begin(), pGroups->end(), pGroup);
+         if (iter == pGroups->end()) throw gig::Exception("Could not delete group, could not find given group");
+         if (pGroups->size() == 1) throw gig::Exception("Cannot delete group, there must be at least one default group!");
+         // move all members of this group to another group
+         pGroup->MoveAll();
+         pGroups->erase(iter);
+         delete pGroup;
+     }
+     void File::LoadGroups() {
+         if (!pGroups) pGroups = new std::list<Group*>;
+         // try to read defined groups from file
+         RIFF::List* lst3gri = pRIFF->GetSubList(LIST_TYPE_3GRI);
+         if (lst3gri) {
+             RIFF::List* lst3gnl = lst3gri->GetSubList(LIST_TYPE_3GNL);
+             if (lst3gnl) {
+                 RIFF::Chunk* ck = lst3gnl->GetFirstSubChunk();
+                 while (ck) {
+                     if (ck->GetChunkID() == CHUNK_ID_3GNM) {
+                         pGroups->push_back(new Group(this, ck));
+                     }
+                     ck = lst3gnl->GetNextSubChunk();
+                 }
+             }
+         }
+         // if there were no group(s), create at least the mandatory default group
+         if (!pGroups->size()) {
+             Group* pGroup = new Group(this, NULL);
+             pGroup->Name = "Default Group";
+             pGroups->push_back(pGroup);
+         }
+     }
+     /**
+      * 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
+      * persistent.
+      *
+      * Usually there is absolutely no need to call this method explicitly.
+      * It will be called automatically when File::Save() was called.
+      *
+      * @throws Exception - on errors
+      */
+     void File::UpdateChunks() {
+         // first update base class's chunks
+         DLS::File::UpdateChunks();
+         // update group's chunks
+         if (pGroups) {
+             std::list<Group*>::iterator iter = pGroups->begin();
+             std::list<Group*>::iterator end  = pGroups->end();
+             for (; iter != end; ++iter) {
+                 (*iter)->UpdateChunks();
+             }
+         }
+     }
  // *************** Exception ***************

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