I am intermediate with c++ but new to the pipeline paradigm and crypt o++
lib. I am trying to zip and unzip a file. I have been able to gzip the
file but when i try to unzip it to a filesink, the file is empty. The gzip
produces a file half the size as the original uncompressed file but gunzip
is giving me a file with nothing in it. I know I am doing something wrong
here. please help. Here is the code that don't work:
try{
std::ofstream
zippedOutFile("C:\\Somefolder\\testzipped",std::ios_base::trunc);
FileSink* zippedSink = new FileSink(zippedOutFile);
Gzip z(zippedSink);
z.Put((byte*)(unCompressedData.c_str()),unlength,true);
z.MessageEnd();
zippedOutFile.close();
std::ifstream
zippedIfstreamFile("C:\\Somefolder\\testzipped",std::ios_base::in);
FileSource zippedSource(zippedIfstreamFile,true);
std::ofstream
unzippedFile("C:\\Somefolder\\\testunzipped",std::ios_base::out);
FileSink* unzippedSink = new FileSink(unzippedFile);
Gunzip uz(unzippedSink);
lword maxZipData = zippedSource.TotalBytesRetrievable();
byte* zipData = new byte[maxZipData+1];
memset(zipData,'\0',sizeof(zipData));
size_t left = zippedSource.Get(zipData,maxZipData);
if(left > 0){
MessageBox(NULL,_T("left > 0"),_T(""),MB_OK);
}
uz.Put(zipData,sizeof(zipData),true);
lword maxUnZippData = uz.TotalBytesRetrievable();
byte* unZippedData = new byte[maxUnZippData+1];
memset(unZippedData,'\0',sizeof(unZippedData));
uz.Get(unZippedData,maxUnZippData);
MessageBox(NULL,CString(unZippedData),_T(""),MB_OK);
unzippedFile.close();
zippedIfstreamFile.close();
}catch(Exception e){
MessageBox(NULL,CString(e.what()),_T(""),MB_OK);
return -1;
}
I am new to crypto++ lib and the pipeline design please help.
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