TZipIn Class Reference

#include <zipfl.h>

Inherits TSIn.

Public Member Functions
	TZipIn (const TStr &FNm)
	TZipIn (const TStr &FNm, bool &OpenedP)
	~TZipIn ()
bool	Eof ()
int	Len () const
char	GetCh ()
char	PeekCh ()
int	GetBf (const void *LBf, const TSize &LBfL)
bool	GetNextLnBf (TChA &LnChA)
uint64	GetFLen () const
uint64	GetCurFPos () const
Public Member Functions inherited from TSIn
	TSIn ()
	TSIn (const TStr &Str)
virtual	~TSIn ()
virtual void	Reset ()
bool	IsFastMode () const
void	SetFastMode (const bool &_FastMode)
void	LoadCs ()
void	LoadBf (const void *Bf, const TSize &BfL)
void *	LoadNewBf (const int &BfL)
void	Load (bool &Bool)
void	Load (uchar &UCh)
void	Load (char &Ch)
void	Load (short &Short)
void	Load (ushort &UShort)
void	Load (int &Int)
void	Load (uint &UInt)
void	Load (int64 &Int)
void	Load (uint64 &UInt)
void	Load (double &Flt)
void	Load (sdouble &SFlt)
void	Load (ldouble &LFlt)
void	Load (char *&CStr, const int &MxCStrLen, const int &CStrLen)
void	Load (char *&CStr)
TSIn &	operator>> (bool &Bool)
TSIn &	operator>> (uchar &UCh)
TSIn &	operator>> (char &Ch)
TSIn &	operator>> (short &Sh)
TSIn &	operator>> (ushort &USh)
TSIn &	operator>> (int &Int)
TSIn &	operator>> (uint &UInt)
TSIn &	operator>> (int64 &Int)
TSIn &	operator>> (uint64 &UInt)
TSIn &	operator>> (float &Flt)
TSIn &	operator>> (double &Double)
TSIn &	operator>> (long double &LDouble)
bool	GetNextLn (TStr &LnStr)
bool	GetNextLn (TChA &LnChA)
Public Member Functions inherited from TSBase
	TSBase (const TSStr &Nm)
virtual	~TSBase ()
virtual TStr	GetSNm () const

Static Public Member Functions
static PSIn	New (const TStr &FNm)
static PSIn	New (const TStr &FNm, bool &OpenedP)
static bool	IsZipFNm (const TStr &FNm)
	Check whether the file extension of FNm is that of a compressed file (.gz, .7z, .rar, .zip, .cab, .arj. bzip2). More...
static bool	IsZipExt (const TStr &FNmExt)
	Check whether the file extension FNmExt is that of a compressed file (.gz, .7z, .rar, .zip, .cab, .arj. bzip2). More...
static TStr	GetCmd (const TStr &ZipFNm)
	Return a command-line string that is executed in order to decompress a file to standard output. More...
static uint64	GetFLen (const TStr &ZipFNm)
	Return the uncompressed size (in bytes) of the compressed file ZipFNm. More...
static PSIn	NewIfZip (const TStr &FNm)

Static Public Attributes
static TStr	SevenZipPath = "/usr/bin"
Static Public Attributes inherited from TSIn
static const TPt< TSIn >	StdIn =PSIn(new TStdIn())

Private Member Functions
void	FillBf ()
int	FindEol (int &BfN)
void	CreateZipProcess (const TStr &Cmd, const TStr &ZipFNm)
	TZipIn ()
	TZipIn (const TZipIn &)
TZipIn &	operator= (const TZipIn &)

Static Private Member Functions
static void	FillFExtToCmdH ()

Private Attributes
FILE *	ZipStdoutRd
FILE *	ZipStdoutWr
uint64	FLen
uint64	CurFPos
char *	Bf
int	BfC
int	BfL

Static Private Attributes
static TStrStrH	FExtToCmdH
static const int	MxBfL =32*1024

Additional Inherited Members
Protected Attributes inherited from TSBase
TCRef	CRef
TSStr	SNm
TCs	Cs

Detailed Description

Compressed File Input Stream. The class reads from a compressed file without explicitly uncompressing it. This is eachieved by running external 7ZIP program which uncompresses to standard output, which is then piped to TZipFl. The class requires 7ZIP to be installed on the machine. Go to http://www.7-zip.org to install the software. 7z (7z.exe) is an executable and can decompress the following formats: .gz, .7z, .rar, .zip, .cab, .arj. bzip2. The class TZipIn expects that '7z' ('7z.exe') is in the working path. Make sure you can execute '7z e -y -bd -so <FILENAME>' For 7z to work properly you need both the 7z executable and the directory 'Codecs'. Use TZipIn::SevenZipPath to set the path to 7z executable.

NOTE: Current implementation of TZipIn supports only .zip format, other compression formats are not supported.

Definition at line 15 of file zipfl.h.

Constructor & Destructor Documentation

TZipIn::TZipIn ( )

private

TZipIn::TZipIn ( const TZipIn &  )

private

TZipIn::TZipIn

(

const TStr &

FNm

)

Definition at line 68 of file zipfl.cpp.

                              : TSBase(FNm.CStr()), TSIn(FNm), ZipStdoutRd(NULL), ZipStdoutWr(NULL),
  FLen(0), CurFPos(0), Bf(NULL), BfC(0), BfL(0) {
  EAssertR(! FNm.Empty(), "Empty file-name.");
  EAssertR(TFile::Exists(FNm), TStr::Fmt("File %s does not exist", FNm.CStr()).CStr());
  FLen = 0;
  // non-zip files not supported, need uncompressed file length information
  if (FNm.GetFExt() != ".zip") {
    printf("*** Error: file %s, compression format %s not supported\n", FNm.CStr(), FNm.GetFExt().CStr());
    EFailR(TStr::Fmt("File %s: compression format %s not supported", FNm.CStr(), FNm.GetFExt().CStr()).CStr());
  }
  FLen = TZipIn::GetFLen(FNm);
  // return for malformed files
  if (FLen == 0) { return; } // empty file
  #ifdef GLib_WIN
  // create pipes
  SECURITY_ATTRIBUTES saAttr;
  saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
  saAttr.bInheritHandle = TRUE;
  saAttr.lpSecurityDescriptor = NULL;
    // Create a pipe for the child process's STDOUT.
  const int PipeBufferSz = 32*1024;
  EAssertR(CreatePipe(&ZipStdoutRd, &ZipStdoutWr, &saAttr, PipeBufferSz), "Stdout pipe creation failed");
  // Ensure the read handle to the pipe for STDOUT is not inherited.
  SetHandleInformation(ZipStdoutRd, HANDLE_FLAG_INHERIT, 0);
  #else
  // no implementation needed
  #endif
  CreateZipProcess(GetCmd(FNm), FNm);
  Bf = new char[MxBfL]; BfC = BfL=-1;
  FillBf();
}

TZipIn::TZipIn	(	const TStr &	FNm,
		bool &	OpenedP
	)

Definition at line 100 of file zipfl.cpp.

                                             : TSBase(FNm.CStr()), TSIn(FNm), ZipStdoutRd(NULL), ZipStdoutWr(NULL),
  FLen(0), CurFPos(0), Bf(NULL), BfC(0), BfL(0) {
  EAssertR(! FNm.Empty(), "Empty file-name.");
  FLen = TZipIn::GetFLen(FNm);
  OpenedP = TFile::Exists(FNm);
  if (OpenedP) {
    #ifdef GLib_WIN
    SECURITY_ATTRIBUTES saAttr;
    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
    saAttr.bInheritHandle = TRUE;
    saAttr.lpSecurityDescriptor = NULL;
    // Create a pipe for the child process's STDOUT.
    EAssertR(CreatePipe(&ZipStdoutRd, &ZipStdoutWr, &saAttr, 0), "Stdout pipe creation failed");
    // Ensure the read handle to the pipe for STDOUT is not inherited.
    SetHandleInformation(ZipStdoutRd, HANDLE_FLAG_INHERIT, 0);
    #else
    // no implementation needed
    #endif
    CreateZipProcess(GetCmd(FNm.GetFExt()), FNm);
    Bf = new char[MxBfL]; BfC = BfL=-1;
    FillBf();
  }
}

TZipIn::~TZipIn

(

)

Definition at line 132 of file zipfl.cpp.

               {
  #ifdef GLib_WIN
  if (ZipStdoutRd != NULL) {
    EAssertR(CloseHandle(ZipStdoutRd), "Closing read-end of pipe failed"); }
  if (ZipStdoutWr != NULL) {
    EAssertR(CloseHandle(ZipStdoutWr)!=0, "Closing write-end of pipe failed"); }
  #else
  if (ZipStdoutRd != NULL) {
    EAssertR(pclose(ZipStdoutRd) != -1, "Closing of the process failed"); }
  #endif
  if (Bf != NULL) { delete[] Bf; }
}

Member Function Documentation

void TZipIn::CreateZipProcess ( const TStr &  Cmd, const TStr &  ZipFNm  )

private

Definition at line 18 of file zipfl.cpp.

                                                                 {
  const TStr CmdLine = TStr::Fmt("%s %s", Cmd.CStr(), ZipFNm.CStr());
  #ifdef GLib_WIN
  PROCESS_INFORMATION piProcInfo;
  STARTUPINFO siStartInfo;
  ZeroMemory( &piProcInfo, sizeof(PROCESS_INFORMATION));
  ZeroMemory( &siStartInfo, sizeof(STARTUPINFO));
  siStartInfo.cb = sizeof(STARTUPINFO);
  siStartInfo.hStdOutput = ZipStdoutWr;
  siStartInfo.dwFlags |= STARTF_USESTDHANDLES;
  // Create the child process.
  const BOOL FuncRetn = CreateProcess(NULL,
    (LPSTR) CmdLine.CStr(),  // command line
    NULL,          // process security attributes
    NULL,          // primary thread security attributes
    TRUE,          // handles are inherited
    0,             // creation flags
    NULL,          // use parent's environment
    NULL,          // use parent's current directory
    &siStartInfo,  // STARTUPINFO pointer
    &piProcInfo);  // receives PROCESS_INFORMATION
  EAssertR(FuncRetn!=0, TStr::Fmt("Can not execute '%s'", CmdLine.CStr()).CStr());
  CloseHandle(piProcInfo.hProcess);
  CloseHandle(piProcInfo.hThread);
  #else
  ZipStdoutRd = popen(CmdLine.CStr(), "r");
  if (ZipStdoutRd == 0) { // try using SevenZipPath
    ZipStdoutRd = popen((TZipIn::SevenZipPath+"/"+CmdLine).CStr(), "r");
  }
  EAssertR(ZipStdoutRd != NULL,  TStr::Fmt("Can not execute '%s'", CmdLine.CStr()).CStr());
  #endif
}

bool TZipIn::Eof ( )

inlinevirtual

Implements TSIn.

Definition at line 45 of file zipfl.h.

{ return CurFPos==FLen && BfC==BfL; }

void TZipIn::FillBf ( )

private

Definition at line 51 of file zipfl.cpp.

                   {
  EAssertR(CurFPos < FLen, "End of file "+GetSNm()+" reached.");
  EAssertR((BfC==BfL)/*&&((BfL==-1)||(BfL==MxBfL))*/, "Error reading file '"+GetSNm()+"'.");
  #ifdef GLib_WIN
  // Read output from the child process
  DWORD BytesRead;
  EAssert(ReadFile(ZipStdoutRd, Bf, MxBfL, &BytesRead, NULL) != 0);
  #else
  size_t BytesRead = fread(Bf, 1, MxBfL, ZipStdoutRd);
  EAssert(BytesRead != 0);
  #endif
  BfL = (int) BytesRead;
  CurFPos += BytesRead;
  EAssertR((BfC!=0)||(BfL!=0), "Error reading file '"+GetSNm()+"'.");
  BfC = 0;
}

void TZipIn::FillFExtToCmdH ( )

staticprivate

Definition at line 206 of file zipfl.cpp.

                            {
  // 7za decompress: "e -y -bd -so";
  #ifdef GLib_WIN
  const char* ZipCmd = "7z.exe e -y -bd -so";
  #else
  const char* ZipCmd = "7za e -y -bd -so";
  #endif
  if (FExtToCmdH.Empty()) {
    FExtToCmdH.AddDat(".gz",  ZipCmd);
    FExtToCmdH.AddDat(".7z",  ZipCmd);
    FExtToCmdH.AddDat(".rar", ZipCmd);
    FExtToCmdH.AddDat(".zip", ZipCmd);
    FExtToCmdH.AddDat(".cab", ZipCmd);
    FExtToCmdH.AddDat(".arj", ZipCmd);
    FExtToCmdH.AddDat(".bzip2", ZipCmd);
    FExtToCmdH.AddDat(".bz2", ZipCmd);
  }
}

int TZipIn::FindEol ( int &  BfN )

private

Definition at line 185 of file zipfl.cpp.

                            {
  char Ch;
  if (BfC >= BfL) { // check for eof, read more data
    if (Eof()) { return -1; }
    FillBf();
  }
  while (BfC < BfL) {
    Ch = Bf[BfC++];
    if (Ch=='\n') { BfN = BfC-1; return 1; }
    if (Ch=='\r' && Bf[BfC+1]=='\n') {
      BfC++;  BfN = BfC-2;  return 1; }
  }
  BfN = BfC;
  return 0;
}

int TZipIn::GetBf ( const void *  LBf, const TSize &  LBfL  )

virtual

Implements TSIn.

Definition at line 145 of file zipfl.cpp.

                                                   {
  int LBfS=0;
  if (TSize(BfC+LBfL)>TSize(BfL)){
    for (TSize LBfC=0; LBfC<LBfL; LBfC++){
      if (BfC==BfL){FillBf();}
      LBfS+=((char*)LBf)[LBfC]=Bf[BfC++];}
  } else {
    for (TSize LBfC=0; LBfC<LBfL; LBfC++){
      LBfS+=(((char*)LBf)[LBfC]=Bf[BfC++]);}
  }
  return LBfS;
}

char TZipIn::GetCh ( )

inlinevirtual

Implements TSIn.

Definition at line 47 of file zipfl.h.

{ if (BfC==BfL){FillBf();} return Bf[BfC++]; }

TStr TZipIn::GetCmd ( const TStr &  ZipFNm )

static

Return a command-line string that is executed in order to decompress a file to standard output.

Definition at line 225 of file zipfl.cpp.

                                      {
  if (FExtToCmdH.Empty()) FillFExtToCmdH();
  const TStr Ext = ZipFNm.GetFExt().GetLc();
  EAssertR(FExtToCmdH.IsKey(Ext), TStr::Fmt("Unsupported file extension '%s'", Ext.CStr()));
  return FExtToCmdH.GetDat(Ext);
}

uint64 TZipIn::GetCurFPos ( ) const

inline

Definition at line 53 of file zipfl.h.

{ return CurFPos; }

uint64 TZipIn::GetFLen ( ) const

inline

Definition at line 52 of file zipfl.h.

{ return FLen; }

uint64 TZipIn::GetFLen ( const TStr &  ZipFNm )

static

Return the uncompressed size (in bytes) of the compressed file ZipFNm.

Definition at line 232 of file zipfl.cpp.

                                         {
  #ifdef GLib_WIN
  HANDLE ZipStdoutRd, ZipStdoutWr;
  // create pipes
  SECURITY_ATTRIBUTES saAttr;
  saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
  saAttr.bInheritHandle = TRUE;
  saAttr.lpSecurityDescriptor = NULL;
    // Create a pipe for the child process's STDOUT.
  const int PipeBufferSz = 32*1024;
  EAssertR(CreatePipe(&ZipStdoutRd, &ZipStdoutWr, &saAttr, PipeBufferSz), "Stdout pipe creation failed");
  // Ensure the read handle to the pipe for STDOUT is not inherited.
  SetHandleInformation(ZipStdoutRd, HANDLE_FLAG_INHERIT, 0);
  //CreateZipProcess(GetCmd(FNm), FNm);
  { const TStr CmdLine = TStr::Fmt("7z.exe l %s", ZipFNm.CStr());
  PROCESS_INFORMATION piProcInfo;
  STARTUPINFO siStartInfo;
  ZeroMemory( &piProcInfo, sizeof(PROCESS_INFORMATION));
  ZeroMemory( &siStartInfo, sizeof(STARTUPINFO));
  siStartInfo.cb = sizeof(STARTUPINFO);
  siStartInfo.hStdOutput = ZipStdoutWr;
  siStartInfo.dwFlags |= STARTF_USESTDHANDLES;
  // Create the child process.
  const BOOL FuncRetn = CreateProcess(NULL, (LPSTR) CmdLine.CStr(),
    NULL, NULL, TRUE, 0, NULL, NULL, &siStartInfo, &piProcInfo);
  EAssertR(FuncRetn!=0, TStr::Fmt("Can not execute '%s'", CmdLine.CStr()).CStr());
  CloseHandle(piProcInfo.hProcess);
  CloseHandle(piProcInfo.hThread); }
  #else
  const TStr CmdLine = TStr::Fmt("7za l %s", ZipFNm.CStr());
  FILE* ZipStdoutRd = popen(CmdLine.CStr(), "r");
  if (ZipStdoutRd == NULL) { // try using SevenZipPath
    ZipStdoutRd = popen((TZipIn::SevenZipPath+"/"+CmdLine).CStr(), "r");
  }
  EAssertR(ZipStdoutRd != NULL, TStr::Fmt("Can not execute '%s'", CmdLine.CStr()).CStr());
  #endif
  // Read output from the child process
  const int BfSz = 32*1024;
  char* Bf = new char [BfSz];
  int BfC=0, BfL=0;
  memset(Bf, 0, BfSz);
  #ifdef GLib_WIN
  DWORD BytesRead;
  EAssert(ReadFile(ZipStdoutRd, Bf, MxBfL, &BytesRead, NULL) != 0);
  #else
  size_t BytesRead = fread(Bf, 1, MxBfL, ZipStdoutRd);
  EAssert(BytesRead != 0);
  EAssert(pclose(ZipStdoutRd) != -1);
  #endif
  BfL = (int) BytesRead;  IAssert((BfC!=0)||(BfL!=0));
  BfC = 0; Bf[BfL] = 0;
  // find file lenght
  TStr Str(Bf);  delete [] Bf;
  TStrV StrV; Str.SplitOnWs(StrV);
  int n = StrV.Len()-1;
  while (n > 0 && ! StrV[n].IsPrefix("-----")) { n--; }
  if (n-7 <= 0) {
    WrNotify(TStr::Fmt("Corrupt file %s: MESSAGE:\n", ZipFNm.CStr()).CStr(), Str.CStr());
    SaveToErrLog(TStr::Fmt("Corrupt file %s. Message:\n:%s\n", ZipFNm.CStr(), Str.CStr()).CStr());
    return 0;
  }
  return StrV[n-7].GetInt64();
}

bool TZipIn::GetNextLnBf ( TChA &  LnChA )

virtual

Implements TSIn.

Definition at line 161 of file zipfl.cpp.

                                    {
  int Status;
  int BfN;        // new pointer to the end of line
  int BfP;        // previous pointer to the line start
  LnChA.Clr();
  do {
    if (BfC >= BfL) { BfP = 0; } // reset the current pointer, FindEol() will read a new buffer
    else { BfP = BfC; }
    Status = FindEol(BfN);
    if (Status >= 0) {
      LnChA.AddBf(&Bf[BfP],BfN-BfP);
      if (Status == 1) { return true; } // got a complete line
    }
    // get more data, if the line is incomplete
  } while (Status == 0);
  // eof or the last line has no newline
  return !LnChA.Empty();
}

bool TZipIn::IsZipExt ( const TStr &  FNmExt )

static

Check whether the file extension FNmExt is that of a compressed file (.gz, .7z, .rar, .zip, .cab, .arj. bzip2).

Definition at line 201 of file zipfl.cpp.

                                        {
  if (FExtToCmdH.Empty()) FillFExtToCmdH();
  return FExtToCmdH.IsKey(FNmExt);
}

static bool TZipIn::IsZipFNm ( const TStr &  FNm )

inlinestatic

Check whether the file extension of FNm is that of a compressed file (.gz, .7z, .rar, .zip, .cab, .arj. bzip2).

Definition at line 56 of file zipfl.h.

{ return IsZipExt(FNm.GetFExt()); }

int TZipIn::Len ( ) const

inlinevirtual

Implements TSIn.

Definition at line 46 of file zipfl.h.

{ return int(FLen-CurFPos+BfL-BfC); }

PSIn TZipIn::New ( const TStr &  FNm )

static

Definition at line 124 of file zipfl.cpp.

                                {
  return PSIn(new TZipIn(FNm));
}

PSIn TZipIn::New ( const TStr &  FNm, bool &  OpenedP  )

static

Definition at line 128 of file zipfl.cpp.

                                              {
  return PSIn(new TZipIn(FNm, OpenedP));
}

static PSIn TZipIn::NewIfZip ( const TStr &  FNm )

inlinestatic

Definition at line 63 of file zipfl.h.

{ return IsZipFNm(FNm) ? New(FNm) : TFIn::New(FNm); }

TZipIn& TZipIn::operator= ( const TZipIn &  )

private

char TZipIn::PeekCh ( )

inlinevirtual

Implements TSIn.

Definition at line 48 of file zipfl.h.

{ if (BfC==BfL){FillBf();} return Bf[BfC]; }

Member Data Documentation

char* TZipIn::Bf

private

Definition at line 27 of file zipfl.h.

int TZipIn::BfC

private

Definition at line 28 of file zipfl.h.

int TZipIn::BfL

private

Definition at line 28 of file zipfl.h.

uint64 TZipIn::CurFPos

private

Definition at line 26 of file zipfl.h.

TStrStrH TZipIn::FExtToCmdH

staticprivate

Definition at line 19 of file zipfl.h.

uint64 TZipIn::FLen

private

Definition at line 26 of file zipfl.h.

const int TZipIn::MxBfL =32*1024

staticprivate

Definition at line 20 of file zipfl.h.

TStr TZipIn::SevenZipPath = "/usr/bin"

static

Definition at line 17 of file zipfl.h.

FILE* TZipIn::ZipStdoutRd

private

Definition at line 24 of file zipfl.h.

FILE * TZipIn::ZipStdoutWr

private

Definition at line 24 of file zipfl.h.

---

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

• glib-core/zipfl.h
• glib-core/zipfl.cpp