SNAP Library 2.0, User Reference  2013-05-13 16:33:57
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Public Member Functions | Static Public Member Functions | Static Private Member Functions | Private Attributes
TGBlobBs Class Reference

#include <blobbs.h>

Inherits TBlobBs.

List of all members.

Public Member Functions

 TGBlobBs (const TStr &BlobBsFNm, const TFAccess &_Access=faRdOnly, const int &_MxSegLen=-1)
 ~TGBlobBs ()
TGBlobBs & operator= (const TGBlobBs &)
TStr GetVersionStr () const
TBlobPt PutBlob (const PSIn &SIn)
TBlobPt PutBlob (const TBlobPt &BlobPt, const PSIn &SIn)
PSIn GetBlob (const TBlobPt &BlobPt)
void DelBlob (const TBlobPt &BlobPt)
TBlobPt GetFirstBlobPt ()
TBlobPt FFirstBlobPt ()
bool FNextBlobPt (TBlobPt &TrvBlobPt, TBlobPt &BlobPt, PSIn &BlobSIn)

Static Public Member Functions

static PBlobBs New (const TStr &BlobBsFNm, const TFAccess &Access=faRdOnly, const int &MxSegLen=-1)
static bool Exists (const TStr &BlobBsFNm)

Static Private Member Functions

static TStr GetNrBlobBsFNm (const TStr &BlobBsFNm)

Private Attributes

PFRnd FBlobBs
TFAccess Access
int MxSegLen
TIntV BlockLenV
TBlobPtV FFreeBlobPtV
TBlobPt FirstBlobPt

Detailed Description

Definition at line 154 of file blobbs.h.

Constructor & Destructor Documentation

TGBlobBs::TGBlobBs ( const TStr &  BlobBsFNm,
const TFAccess &  _Access = faRdOnly,
const int &  _MxSegLen = -1 
)

Definition at line 220 of file blobbs.cpp.

                                                                      :
  TBlobBs(), FBlobBs(), Access(_Access), MxSegLen(_MxSegLen),
  BlockLenV(), FFreeBlobPtV(TB4Def::B4Bits), FirstBlobPt(){
  if (MxSegLen==-1){MxSegLen=MxBlobFLen;}
  TStr NrBlobBsFNm=GetNrBlobBsFNm(BlobBsFNm);
  switch (Access){
    case faCreate:
      FBlobBs=TFRnd::New(NrBlobBsFNm, faCreate, true); break;
    case faUpdate:
    case faRdOnly:
    case faRestore:
      FBlobBs=TFRnd::New(NrBlobBsFNm, faUpdate, true); break;
    default: Fail;
  }
  if (FBlobBs->Empty()){
    FBlobBs->SetFPos(0);
    PutVersionStr(FBlobBs);
    PutBlobBsStateStr(FBlobBs, bbsOpened);
    PutMxSegLen(FBlobBs, MxSegLen);
    GenBlockLenV(BlockLenV);
    PutBlockLenV(FBlobBs, BlockLenV);
    GenFFreeBlobPtV(BlockLenV, FFreeBlobPtV);
    PutFFreeBlobPtV(FBlobBs, FFreeBlobPtV);
  } else {
    FBlobBs->SetFPos(0);
    AssertVersionStr(FBlobBs);
    int FPos=FBlobBs->GetFPos();
    if (Access!=faRestore){
      AssertBlobBsStateStr(FBlobBs, bbsClosed);}
    if (Access!=faRdOnly){
      FBlobBs->SetFPos(FPos);
      PutBlobBsStateStr(FBlobBs, bbsOpened);
    }
    MxSegLen=GetMxSegLen(FBlobBs);
    GetBlockLenV(FBlobBs, BlockLenV);
    GetFFreeBlobPtV(FBlobBs, FFreeBlobPtV);
  }
  FirstBlobPt=TBlobPt(FBlobBs->GetFPos());
  FBlobBs->Flush();
}
TGBlobBs::~TGBlobBs ( )

Definition at line 262 of file blobbs.cpp.

                   {
  if (Access!=faRdOnly){
    FBlobBs->SetFPos(0);
    PutVersionStr(FBlobBs);
    PutBlobBsStateStr(FBlobBs, bbsClosed);
    PutMxSegLen(FBlobBs, MxSegLen);
    PutBlockLenV(FBlobBs, BlockLenV);
    PutFFreeBlobPtV(FBlobBs, FFreeBlobPtV);
  }
  FBlobBs->Flush();
  FBlobBs=NULL;
}

Member Function Documentation

void TGBlobBs::DelBlob ( const TBlobPt &  BlobPt) [virtual]

Implements TBlobBs.

Definition at line 353 of file blobbs.cpp.

                                           {
  EAssert((Access==faCreate)||(Access==faUpdate)||(Access==faRestore));
  FBlobBs->SetFPos(BlobPt.GetAddr());
  AssertBlobTag(FBlobBs, btBegin);
  int MxBfL=FBlobBs->GetInt();
  int FPos=FBlobBs->GetFPos();
  AssertBlobState(FBlobBs, bsActive);
  /*int BfL=*/FBlobBs->GetInt();
  FBlobBs->SetFPos(FPos);
  PutBlobState(FBlobBs, bsFree);
  int _MxBfL; int FFreeBlobPtN;
  GetAllocInfo(MxBfL, BlockLenV, _MxBfL, FFreeBlobPtN);
  EAssert(MxBfL==_MxBfL);
  FFreeBlobPtV[FFreeBlobPtN].SaveAddr(FBlobBs);
  FFreeBlobPtV[FFreeBlobPtN]=BlobPt;
  FBlobBs->PutCh(TCh::NullCh, MxBfL+sizeof(TCs));
  AssertBlobTag(FBlobBs, btEnd);
  FBlobBs->Flush();
}
bool TGBlobBs::Exists ( const TStr &  BlobBsFNm) [static]

Definition at line 410 of file blobbs.cpp.

                                          {
  TStr NrBlobBsFNm=GetNrBlobBsFNm(BlobBsFNm);
  return TFile::Exists(NrBlobBsFNm);
}
TBlobPt TGBlobBs::FFirstBlobPt ( ) [virtual]

Implements TBlobBs.

Definition at line 373 of file blobbs.cpp.

                              {
  return FirstBlobPt;
}
bool TGBlobBs::FNextBlobPt ( TBlobPt &  TrvBlobPt,
TBlobPt &  BlobPt,
PSIn &  BlobSIn 
) [virtual]

Implements TBlobBs.

Definition at line 377 of file blobbs.cpp.

                                                                            {
  forever {
    uint TrvBlobAddr=TrvBlobPt.GetAddr();
    if (TrvBlobAddr>=uint(FBlobBs->GetFLen())){
      TrvBlobPt.Clr(); BlobPt.Clr(); BlobSIn=NULL;
      return false;
    } else {
      FBlobBs->SetFPos(TrvBlobAddr);
      AssertBlobTag(FBlobBs, btBegin);
      int MxBfL=FBlobBs->GetInt();
      TBlobState BlobState=GetBlobState(FBlobBs);
      switch (BlobState){
        case bsActive:{
          int BfL=FBlobBs->GetInt();
          TCs BfCs; BlobSIn=FBlobBs->GetSIn(BfL, BfCs);
          FBlobBs->MoveFPos(MxBfL-BfL);
          TCs FCs=FBlobBs->GetCs();
          AssertBlobTag(FBlobBs, btEnd);
          AssertBfCsEqFlCs(BfCs, FCs);
          BlobPt=TrvBlobPt;
          TrvBlobPt=TBlobPt(FBlobBs->GetFPos());
          return true;}
        case bsFree:
          FBlobBs->MoveFPos(sizeof(uint)+MxBfL+sizeof(TCs));
          AssertBlobTag(FBlobBs, btEnd);
          TrvBlobPt=TBlobPt(FBlobBs->GetFPos());
          break;
        default: Fail; return false;
      }
    }
  }
}
PSIn TGBlobBs::GetBlob ( const TBlobPt &  BlobPt) [virtual]

Implements TBlobBs.

Definition at line 339 of file blobbs.cpp.

                                           {
  FBlobBs->SetFPos(BlobPt.GetAddr());
  AssertBlobTag(FBlobBs, btBegin);
  int MxBfL=FBlobBs->GetInt();
  AssertBlobState(FBlobBs, bsActive);
  int BfL=FBlobBs->GetInt();
  TCs BfCs; PSIn SIn=FBlobBs->GetSIn(BfL, BfCs);
  FBlobBs->MoveFPos(MxBfL-BfL);
  TCs FCs=FBlobBs->GetCs();
  AssertBlobTag(FBlobBs, btEnd);
  AssertBfCsEqFlCs(BfCs, FCs);
  return SIn;
}
TBlobPt TGBlobBs::GetFirstBlobPt ( ) [inline, virtual]

Implements TBlobBs.

Definition at line 179 of file blobbs.h.

{return FirstBlobPt;}
TStr TGBlobBs::GetNrBlobBsFNm ( const TStr &  BlobBsFNm) [static, private]

Definition at line 213 of file blobbs.cpp.

                                                  {
  TStr NrBlobBsFNm=BlobBsFNm;
  if (NrBlobBsFNm.GetFExt().Empty()){
    NrBlobBsFNm=NrBlobBsFNm+".gbb";}
  return NrBlobBsFNm;
}
TStr TGBlobBs::GetVersionStr ( ) const [inline, virtual]

Implements TBlobBs.

Definition at line 173 of file blobbs.h.

{return TStr("General Blob Base Format 1.0");}
static PBlobBs TGBlobBs::New ( const TStr &  BlobBsFNm,
const TFAccess &  Access = faRdOnly,
const int &  MxSegLen = -1 
) [inline, static]

Definition at line 166 of file blobbs.h.

                          {
    return PBlobBs(new TGBlobBs(BlobBsFNm, Access, MxSegLen));}
TGBlobBs& TGBlobBs::operator= ( const TGBlobBs &  ) [inline]

Definition at line 171 of file blobbs.h.

{Fail; return *this;}
TBlobPt TGBlobBs::PutBlob ( const PSIn &  SIn) [virtual]

Implements TBlobBs.

Definition at line 275 of file blobbs.cpp.

                                        {
  EAssert((Access==faCreate)||(Access==faUpdate)||(Access==faRestore));
  int BfL=SIn->Len();
  int MxBfL; int FFreeBlobPtN;
  GetAllocInfo(BfL, BlockLenV, MxBfL, FFreeBlobPtN);
  TBlobPt BlobPt; TCs Cs;
  if (FFreeBlobPtV[FFreeBlobPtN].Empty()){
    int FLen=FBlobBs->GetFLen();
    if (FLen<=MxSegLen){
      EAssert(FLen<=MxBlobFLen);
      BlobPt=TBlobPt(FLen);
      FBlobBs->SetFPos(BlobPt.GetAddr());
      PutBlobTag(FBlobBs, btBegin);
      FBlobBs->PutInt(MxBfL);
      PutBlobState(FBlobBs, bsActive);
      FBlobBs->PutInt(BfL);
      FBlobBs->PutSIn(SIn, Cs);
      FBlobBs->PutCh(TCh::NullCh, MxBfL-BfL);
      FBlobBs->PutCs(Cs);
      PutBlobTag(FBlobBs, btEnd);
    }
  } else {
    BlobPt=FFreeBlobPtV[FFreeBlobPtN];
    FBlobBs->SetFPos(BlobPt.GetAddr());
    AssertBlobTag(FBlobBs, btBegin);
    int MxBfL=FBlobBs->GetInt();
    int FPos=FBlobBs->GetFPos();
    AssertBlobState(FBlobBs, bsFree);
    FFreeBlobPtV[FFreeBlobPtN]=TBlobPt::LoadAddr(FBlobBs);
    FBlobBs->SetFPos(FPos);
    PutBlobState(FBlobBs, bsActive);
    FBlobBs->PutInt(BfL);
    FBlobBs->PutSIn(SIn, Cs);
    FBlobBs->PutCh(TCh::NullCh, MxBfL-BfL);
    FBlobBs->PutCs(Cs);
    AssertBlobTag(FBlobBs, btEnd);
  }
  FBlobBs->Flush();
  return BlobPt;
}
TBlobPt TGBlobBs::PutBlob ( const TBlobPt &  BlobPt,
const PSIn &  SIn 
) [virtual]

Implements TBlobBs.

Definition at line 316 of file blobbs.cpp.

                                                               {
  EAssert((Access==faCreate)||(Access==faUpdate)||(Access==faRestore));
  int BfL=SIn->Len();

  FBlobBs->SetFPos(BlobPt.GetAddr());
  AssertBlobTag(FBlobBs, btBegin);
  int MxBfL=FBlobBs->GetInt();
  AssertBlobState(FBlobBs, bsActive);
  if (BfL>MxBfL){
    DelBlob(BlobPt);
    return PutBlob(SIn);
  } else {
    TCs Cs;
    FBlobBs->PutInt(BfL);
    FBlobBs->PutSIn(SIn, Cs);
    FBlobBs->PutCh(TCh::NullCh, MxBfL-BfL);
    FBlobBs->PutCs(Cs);
    PutBlobTag(FBlobBs, btEnd);
    FBlobBs->Flush();
    return BlobPt;
  }
}

Member Data Documentation

TFAccess TGBlobBs::Access [private]

Definition at line 157 of file blobbs.h.

TIntV TGBlobBs::BlockLenV [private]

Definition at line 159 of file blobbs.h.

PFRnd TGBlobBs::FBlobBs [private]

Definition at line 156 of file blobbs.h.

TBlobPtV TGBlobBs::FFreeBlobPtV [private]

Definition at line 160 of file blobbs.h.

TBlobPt TGBlobBs::FirstBlobPt [private]

Definition at line 161 of file blobbs.h.

int TGBlobBs::MxSegLen [private]

Definition at line 158 of file blobbs.h.

The documentation for this class was generated from the following files: