I am receiving binary data in a string. I want to encode that into Base64. Is there any class to do that operation (I want an API).
-
What language(s) are you familiar with?jforberg– jforberg2011-06-17 11:52:13 +00:00Commented Jun 17, 2011 at 11:52
Add a comment
|
2 Answers
CryptBinaryToString ...if you target to Windows platform
Here is a little sample:
#include <Windows.h>
#pragma comment(lib, "crypt32.lib")
int main()
{
LPCSTR pszSource = "Man is distinguished, not only by his reason, but ...";
DWORD nDestinationSize;
if (CryptBinaryToString(reinterpret_cast<const BYTE*> (pszSource), strlen(pszSource), CRYPT_STRING_BASE64, nullptr, &nDestinationSize))
{
LPTSTR pszDestination = static_cast<LPTSTR> (HeapAlloc(GetProcessHeap(), HEAP_NO_SERIALIZE, nDestinationSize * sizeof(TCHAR)));
if (pszDestination)
{
if (CryptBinaryToString(reinterpret_cast<const BYTE*> (pszSource), strlen(pszSource), CRYPT_STRING_BASE64, pszDestination, &nDestinationSize))
{
// Succeeded: 'pszDestination' is 'pszSource' encoded to base64.
}
HeapFree(GetProcessHeap(), HEAP_NO_SERIALIZE, pszDestination);
}
}
return 0;
}
1 Comment
BЈовић
this is windows only answer
Here is the code snippets based on @ruslan-garipov 's answer and msdn. Add To/From methods and some RAII.
std::string ToBase64(const BYTE* pBuf, DWORD cbSize)
{
if (!pBuf || !cbSize) { return {}; }
DWORD cchWith0{};
if (!CryptBinaryToStringA(pBuf, cbSize, CRYPT_STRING_BASE64, nullptr, &cchWith0)) { return {}; }
std::vector<char> base64Str(cchWith0, '\0');
if (!CryptBinaryToStringA(pBuf, cbSize, CRYPT_STRING_BASE64, &base64Str[0], &cchWith0)) { return {}; }
return base64Str.data();
}
std::vector<BYTE> FromBase64(const char* szBase64, DWORD cchWith0 = 0)
{
if (!szBase64) { return {}; }
cchWith0 = cchWith0 ? cchWith0 : DWORD(strlen(szBase64)) + 1;
DWORD cbRequired{}, dwSkip{}, dwFlags{};
if (!CryptStringToBinaryA(szBase64, cchWith0, CRYPT_STRING_BASE64, nullptr, &cbRequired, &dwSkip, &dwFlags)) { return {}; }
std::vector<BYTE> binaryBuf(cbRequired);
if (!CryptStringToBinaryA(szBase64, cchWith0, CRYPT_STRING_BASE64, &binaryBuf[0], &cbRequired, &dwSkip, &dwFlags)) { return {}; }
return binaryBuf;
}
