void DigestTransform::AttributeChanged(CFStringRef name, CFTypeRef value)
{
if (CFStringCompare(name, kSecTransformInputAttributeName, 0) == kCFCompareEqualTo)
{
if (value == NULL)
{
// we are done, finalize the digest and send the result forward
const void* result = mDigest->Finalize();
// send the result
CFDataRef resultRef = CFDataCreate(NULL, (UInt8*) result, mDigest->DigestLength());
SendAttribute(kSecTransformOutputAttributeName, resultRef);
CFRelease(resultRef);
// send the EOS
SendAttribute(kSecTransformOutputAttributeName, NULL);
}
else
{
// if we got an error, just pass it on
CFTypeID valueType = CFGetTypeID(value);
if (valueType == CFErrorGetTypeID())
{
SendAttribute(kSecTransformOutputAttributeName, value);
}
else if (valueType != CFDataGetTypeID())
{
CFStringRef idType = CFCopyTypeIDDescription(valueType);
CFErrorRef result = CreateSecTransformErrorRef(kSecTransformErrorInvalidType, "value is not a CFDataRef -- it's a %@ instead", idType);
CFRelease(idType);
SetAttributeNoCallback(kSecTransformOutputAttributeName, result);
}
else
{
CFDataRef valueRef = (CFDataRef) value;
mDigest->Update(CFDataGetBytePtr(valueRef), CFDataGetLength(valueRef));
}
}
}
}
bool Type::IsError( void ) const
{
return this->GetTypeID() == CFErrorGetTypeID();
}