Support hashing while writing MXFs.

1 files changed, 49 insertions, 1 deletions

diff --git a/src/KM_fileio.cpp b/src/KM_fileio.cpp
index 36101fb..e7b1e73 100644
--- a/src/KM_fileio.cpp
+++ b/src/KM_fileio.cpp
@@ -32,6 +32,8 @@ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <KM_fileio.h>
 #include <KM_log.h>
 #include <fcntl.h>
+#include <sstream>
+#include <iomanip>
 
 #include <assert.h>
 
@@ -727,7 +729,9 @@ Kumu::FileReader::Size() const
 
 // these are declared here instead of in the header file
 // because we have a mem_ptr that is managing a hidden class
-Kumu::FileWriter::FileWriter() {}
+Kumu::FileWriter::FileWriter()
+  : m_Hashing(false)
+{}
 Kumu::FileWriter::~FileWriter() {}
 
 //
@@ -752,6 +756,41 @@ Kumu::FileWriter::Writev(const byte_t* buf, ui32_t buf_len)
   return RESULT_OK;
 }
 
+void
+Kumu::FileWriter::StartHashing()
+{
+  m_Hashing = true;
+  MD5_Init (&m_MD5Context);
+}
+
+void
+Kumu::FileWriter::MaybeHash(void const * data, int size)
+{
+  if (m_Hashing)
+    {
+      MD5_Update (&m_MD5Context, data, size);
+    }
+}
+
+std::string
+Kumu::FileWriter::StopHashing()
+{
+  m_Hashing = false;
+
+  unsigned char digest[MD5_DIGEST_LENGTH];
+  MD5_Final (digest, &m_MD5Context);
+
+  std::stringstream s;
+  for (int i = 0; i < MD5_DIGEST_LENGTH; ++i)
+    {
+      s << std::hex << std::setfill('0') << std::setw(2) << ((int) digest[i]);
+    }
+
+  return s.str ();
+}
+
+
+
 
 #ifdef KM_WIN32
 //------------------------------------------------------------------------------------------
@@ -998,6 +1037,7 @@ Kumu::FileWriter::Writev(ui32_t* bytes_written)
 	  break;
 	}
 
+      MaybeHash(iov->m_iovec[i].iov_base, iov->m_iovec[i].iov_len);
       *bytes_written += tmp_count;
     }
 
@@ -1028,6 +1068,8 @@ Kumu::FileWriter::Write(const byte_t* buf, ui32_t buf_len, ui32_t* bytes_written
   if ( result == 0 || *bytes_written != buf_len )
     return Kumu::RESULT_WRITEFAIL;
 
+  MaybeHash(buf, buf_len);
+
   return Kumu::RESULT_OK;
 }
 
@@ -1171,6 +1213,11 @@ Kumu::FileWriter::Writev(ui32_t* bytes_written)
   if ( write_size == -1L || write_size != total_size )
     return RESULT_WRITEFAIL;
 
+  for (int i = 0; i < iov->m_Count; ++i)
+    {
+      MaybeHash(iov->m_iovec[i].iov_base, iov->m_iovec[i].iov_len);
+    }
+
   iov->m_Count = 0;
   *bytes_written = write_size;
   return RESULT_OK;
@@ -1190,6 +1237,7 @@ Kumu::FileWriter::Write(const byte_t* buf, ui32_t buf_len, ui32_t* bytes_written
     return RESULT_STATE;
 
   int write_size = write(m_Handle, buf, buf_len);
+  MaybeHash(buf, buf_len);
 
   if ( write_size == -1L || (ui32_t)write_size != buf_len )
     return RESULT_WRITEFAIL;