Add OpenSSL licence exception.

[libdcp.git] / src / asset_writer.cc

diff --git a/src/asset_writer.cc b/src/asset_writer.cc
index eb55feafbfb43f933e26fa9b2d03cbd173769b8f..c5610e5dd8ccc84f0e0ae42c03a734616bb90324 100644 (file)
--- a/src/asset_writer.cc
+++ b/src/asset_writer.cc
@@ -1,20 +1,34 @@
 /*
     Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
 
-    This program is free software; you can redistribute it and/or modify
+    This file is part of libdcp.
+
+    libdcp is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
+    libdcp is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+    along with libdcp.  If not, see <http://www.gnu.org/licenses/>.
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of portions of this program with the
+    OpenSSL library under certain conditions as described in each
+    individual source file, and distribute linked combinations
+    including the two.
 
+    You must obey the GNU General Public License in all respects
+    for all of the code used other than OpenSSL.  If you modify
+    file(s) with this exception, you may extend this exception to your
+    version of the file(s), but you are not obligated to do so.  If you
+    do not wish to do so, delete this exception statement from your
+    version.  If you delete this exception statement from all source
+    files in the program, then also delete it here.
 */
 
 /** @file  src/asset_writer.h
@@ -33,36 +47,54 @@ using namespace dcp;
  *  @param mxf MXF that we are writing.
  *  @param file File to write to.
  */
-AssetWriter::AssetWriter (MXF* mxf, boost::filesystem::path file)
+AssetWriter::AssetWriter (MXF* mxf, boost::filesystem::path file, Standard standard)
        : _mxf (mxf)
        , _file (file)
        , _frames_written (0)
        , _finalized (false)
+       , _started (false)
        , _encryption_context (0)
+       , _hmac_context (0)
 {
        if (mxf->key ()) {
                _encryption_context = new ASDCP::AESEncContext;
                if (ASDCP_FAILURE (_encryption_context->InitKey (mxf->key()->value ()))) {
                        throw MiscError ("could not set up encryption context");
                }
-               
+
                uint8_t cbc_buffer[ASDCP::CBC_BLOCK_SIZE];
-               
+
                Kumu::FortunaRNG rng;
                if (ASDCP_FAILURE (_encryption_context->SetIVec (rng.FillRandom (cbc_buffer, ASDCP::CBC_BLOCK_SIZE)))) {
                        throw MiscError ("could not set up CBC initialization vector");
                }
+
+               _hmac_context = new ASDCP::HMACContext;
+
+               ASDCP::LabelSet_t type;
+               if (standard == INTEROP) {
+                       type = ASDCP::LS_MXF_INTEROP;
+               } else {
+                       type = ASDCP::LS_MXF_SMPTE;
+               }
+
+               if (ASDCP_FAILURE (_hmac_context->InitKey (mxf->key()->value(), type))) {
+                       throw MiscError ("could not set up HMAC context");
+               }
        }
 }
 
 AssetWriter::~AssetWriter ()
 {
        delete _encryption_context;
+       delete _hmac_context;
 }
 
-void
+/** @return true if anything was written by this writer */
+bool
 AssetWriter::finalize ()
 {
        DCP_ASSERT (!_finalized);
        _finalized = true;
+       return _started;
 }