inline BOOL Base64Encode()

in src/unix/inc/atl/atlenc.h [79:174]

• 87 lines of code
• 21 McCabe index (conditional complexity)

inline BOOL Base64Encode(
	_In_reads_(nSrcLen) const BYTE *pbSrcData,
	_In_ int nSrcLen,
	_When_(*pnDestLen > 0, _Out_writes_to_(*pnDestLen, *pnDestLen)) LPSTR szDest,
	_Inout_ int *pnDestLen,
	_In_ DWORD dwFlags = ATL_BASE64_FLAG_NONE) throw()
{
	static const char s_chBase64EncodingTable[64] = {
		'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
		'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g',	'h',
		'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
		'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };

	if (!pbSrcData || !szDest || !pnDestLen)
	{
		return FALSE;
	}

	if(*pnDestLen < Base64EncodeGetRequiredLength(nSrcLen, dwFlags))
	{
		ATLASSERT(FALSE);
		return FALSE;
	}

	int nWritten( 0 );
	int nLen1( (nSrcLen/3)*4 );
	int nLen2( nLen1/76 );
	int nLen3( 19 );

	for (int i=0; i<=nLen2; i++)
	{
		if (i==nLen2)
			nLen3 = (nLen1%76)/4;

		for (int j=0; j<nLen3; j++)
		{
			DWORD dwCurr(0);
			for (int n=0; n<3; n++)
			{
				dwCurr |= *pbSrcData++;
				dwCurr <<= 8;
			}
			for (int k=0; k<4; k++)
			{
				BYTE b = (BYTE)(dwCurr>>26);
				*szDest++ = s_chBase64EncodingTable[b];
				dwCurr <<= 6;
			}
		}
		nWritten+= nLen3*4;

		if ((dwFlags & ATL_BASE64_FLAG_NOCRLF)==0)
		{
			*szDest++ = '\r';
			*szDest++ = '\n';
			nWritten+= 2;
		}
	}

	if (nWritten && (dwFlags & ATL_BASE64_FLAG_NOCRLF)==0)
	{
		szDest-= 2;
		nWritten -= 2;
	}

	nLen2 = (nSrcLen%3) ? (nSrcLen%3 + 1) : 0;
	if (nLen2)
	{
		DWORD dwCurr(0);
		for (int n=0; n<3; n++)
		{
			if (n<(nSrcLen%3))
				dwCurr |= *pbSrcData++;
			dwCurr <<= 8;
		}
		for (int k=0; k<nLen2; k++)
		{
			BYTE b = (BYTE)(dwCurr>>26);
			*szDest++ = s_chBase64EncodingTable[b];
			dwCurr <<= 6;
		}
		nWritten+= nLen2;
		if ((dwFlags & ATL_BASE64_FLAG_NOPAD)==0)
		{
			nLen3 = nLen2 ? 4-nLen2 : 0;
			for (int j=0; j<nLen3; j++)
			{
				*szDest++ = '=';
			}
			nWritten+= nLen3;
		}
	}

	*pnDestLen = nWritten;
	return TRUE;
}