Reading All RAR files

Hi,

I wanted to share with the community my way of using RAR files in C++ . RAR files offer better engryption and compression ratio than zip files.
The solution need 3 files :
-unrar.dll the original dll from UNRAR SDK
-unrar.h a c++ interface for the dll (that i forked somehow)
-Libunrar.a a static library for linking under mingw complilers (i dont like .lib linking and Visual Studio crap)

How to use in your c++ project:
- Plug the dll and the .h file into the same dir of your app.
- Link with the .a library
- Put the two functions below in your app

Use the RGetfileEx function like this : unsigned char*Buffer=RGetfileEx("Rarfilename","extractfilename","password",size) , size must be int variable
it searches for a specific file in the rar archive and decompresses it into the memory Buffer and returns the filesize in the variable size (4th parameter of the function)

Code:

---


#include "unrar.h"

unsigned char* BufferRAR=NULL;
HANDLE rarFile;
RARHeaderDataEx fileInfo;
RAROpenArchiveDataEx archiveInfo;
int cntp=0;
int OldSize=0;

int __stdcall CallbackProc(UINT msg,LONG UserData,LONG P1,LONG P2)
{
  switch(msg)
  {
    case UCM_CHANGEVOLUME:
      return(0);
    case UCM_PROCESSDATA:
                if (BufferRAR == NULL){
                        OldSize = 0;
                        cntp= 0;
                        BufferRAR = (unsigned char*) malloc(P2);
                        cntp=cntp+P2;
                        }
                else
                        {
                        OldSize = cntp;
                        BufferRAR = (unsigned char*) realloc(BufferRAR, OldSize + P2);
                        cntp=cntp+P2;
                        }
                memcpy(BufferRAR + OldSize,(unsigned char*)P1,P2);
                return 1;
    case UCM_NEEDPASSWORD:
      return(0);
  }
  return(0);
}


unsigned char* RGetfileEx (char *fnm,char *rarnm,char *pasw,int &si){
    BufferRAR=NULL;
    HANDLE rarFile;
    RARHeaderDataEx fileInf;
    RAROpenArchiveDataEx archiveInf;
    memset(&archiveInf, 0, sizeof(archiveInf));
    archiveInf.CmtBuf = NULL;
    archiveInf.OpenMode = RAR_OM_EXTRACT;
    archiveInf.ArcName = rarnm;
    rarFile = RAROpenArchiveEx(&archiveInf);
        RARSetPassword(rarFile, pasw);
        RARSetCallback(rarFile, CallbackProc,NULL);

    if (archiveInf.OpenResult != 0) {
      RARCloseArchive(rarFile);
      cout  << "unrar couldn't open" << endl;
      return NULL;
    }
        fileInf.CmtBuf = NULL;

        int PFCode;
        bool exi=FALSE;
        si=0;
        while (!exi){
                //cout << fileInfo.FileName << " (" << fileInfo.UnpSize << ")" << endl;
                if (stricmp(fileInf.FileName,fnm)==0){
                    PFCode = RARProcessFileW(rarFile, RAR_TEST, NULL, NULL);
                    si=fileInf.UnpSize;
                    if (PFCode != 0) cout  << "error processing this file\n" << endl;
                    RARCloseArchive(rarFile);
                    exi=TRUE;
                }
                else
                {
                PFCode=RARProcessFileW(rarFile, RAR_SKIP, NULL, NULL);
                if (RARReadHeaderEx(rarFile, &fileInf)==ERAR_END_ARCHIVE)
                        {
                        exi=TRUE;
                        RARCloseArchive(rarFile);
                        cout << "end of archive:file not found" << endl;
                        BufferRAR=NULL;
                        }
                }

        }
        return BufferRAR;
}

---

Hope that some one could integrate this in thinbasic modules.

https://fileup.to/dxNN/unrar.h
https://fileup.to/dxNM/libunrar.a
https://fileup.to/dxNL/UnRAR.dll