some buffer including '\0' cannot be calculated true hash value

[leeqwind]

some buffer including '\0' - such as "The apple is\0 delicious!" - cannot be calculated true hash value by myWrapper->getHashFromString() function. It will only calculate hashes for "The apple is" substring because std::string constructor cut off the buffer when it meet '\0'. Then the text.length() would also be wrong, because std::string cannot calculate the correct length of the buffer.

Who know more about the bufferlen than the caller?

A little bit better solution is:

virtual std::string getHashFromString(const char* text, unsigned long textlen)
{
resetContext();
updateContext((unsigned char*)text, textlen);
return this->hashIt();
}

use LPCSTR pointer to transmit buffer parameter and the length of the buffer. The length is gaven by the caller, and it needn't construct a std::string object in runtime.

[leeqwind]

circumstances:

I need to calculate a PE file sha1 and md5, sha256, 512, etc. And the file content is already open and read in other routines. so now i should just call getHashFromString to calculate what i want. but you know PE files include many 0x00 bytes, like ELF files. so the problem with the description above occurs.