const std::string getHash(std::string fname){
std::ifstream f;
f.open(fname.c_str());
SHA256 digest;
const size_t BufferSize = 144 * 7 * 1024;
char * buffer = new char[BufferSize];
if (f != NULL){
f.read(buffer, BufferSize);//read(char *s, streamsize n)
std::size_t numByte = size_t(f.gcount());//gcount(): return the number of characters extracted by the last unformatted input operation
digest.add(buffer, numByte);
}
f.close();
delete[] buffer;
return digest.getHash();
}
std::string GetSha256ForFile(std::filesystem::path Filename)
{
SHA256 SHA;
std::ifstream InStream(Filename.string());
unsigned char tmpbuf[256];
if (!InStream.is_open())
return "";
while (!InStream.eof())
{
InStream.read((char*)tmpbuf, 256);
size_t cnt = InStream.gcount();
SHA.add(tmpbuf, cnt);
}
return std::string(SHA.getHash());
}
std::string GetSha256ForFile(std::string Filename)
{
SHA256 SHA;
#ifndef WIN32
std::ifstream InStream(Filename.c_str());
#else
std::ifstream InStream(Utility::Widen(Filename).c_str());
#endif
unsigned char tmpbuf[256];
if (!InStream.is_open())
return "";
while (!InStream.eof())
{
InStream.read((char*)tmpbuf, 256);
size_t cnt = InStream.gcount();
SHA.add(tmpbuf, cnt);
}
return std::string(SHA.getHash());
}
