/*----------------------------------------------------------------------
| AP4_ByteStream::WriteUI32
+---------------------------------------------------------------------*/
AP4_Result
AP4_ByteStream::WriteUI32(AP4_UI32 value)
{
unsigned char buffer[4];
// convert value to bytes
AP4_BytesFromUInt32BE(buffer, value);
// write bytes to the stream
return Write((void*)buffer, 4);
}
/*----------------------------------------------------------------------
| AP4_IsmaCipher::EncryptSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_IsmaCipher::EncryptSample(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
AP4_Offset iv,
bool skip_encryption)
{
// setup the buffers
const unsigned char* in = data_in.GetData();
data_out.SetDataSize(data_in.GetDataSize()+4);
unsigned char* out = data_out.UseData();
// IV on 4 bytes
AP4_BytesFromUInt32BE(out, iv);
out += 4;
// encrypt the payload
m_Cipher->SetStreamOffset(iv);
m_Cipher->ProcessBuffer(in, out, data_in.GetDataSize());
return AP4_FAILURE;
}
