Function Base64DecodeClover

rEFIt_UEFI/Platform/b64cdecode.cpp:96–127

UEFI interface to base54 decode. * Decodes EncodedData into a new allocated buffer and returns it. Caller is responsible to FreePool() it. * If DecodedSize != NULL, then size od decoded data is put there. * If return value is not NULL, DecodedSize IS > 0 */

 * If return value is not NULL, DecodedSize IS > 0
 */
UINT8 *Base64DecodeClover(IN CONST CHAR8 *EncodedData, OUT UINTN *DecodedSize)
{
	UINTN				EncodedSize;
	INTN				DecodedSizeInternal;
	UINT8				*DecodedData;
	base64_decodestate	state_in;

	if (EncodedData == NULL) {
		return NULL;
	}
	EncodedSize = strlen(EncodedData);
	if (EncodedSize == 0) {
		return NULL;
	}
	// to simplify, we'll allocate the same size, although smaller size is needed
	DecodedData = (__typeof__(DecodedData))AllocateZeroPool(EncodedSize);

	base64_init_decodestate(&state_in);
	DecodedSizeInternal = base64_decode_block(EncodedData, (const int)EncodedSize, (char*) DecodedData, &state_in);

	if ( DecodedSizeInternal == 0 ) {
    FreePool(DecodedData);
    DecodedData = NULL;
  }

	if (DecodedSize != NULL) {
    if ( DecodedSizeInternal < 0 ) panic("Base64DecodeClover : DecodedSizeInternal < 0");
		*DecodedSize = (UINTN)DecodedSizeInternal;
	}

	return DecodedData;
}