Bitwise MXF comparison.

[libdcp.git] / src / asset.cc

diff --git a/src/asset.cc b/src/asset.cc
index 740dc592335c6379f07824b6c896af8a1acd52b0..86bd54c56d700e21446d3c3a016f24011f8a440a 100644 (file)
--- a/src/asset.cc
+++ b/src/asset.cc
@@ -22,6 +22,7 @@
  */
 
 #include <iostream>
+#include <fstream>
 #include <boost/filesystem.hpp>
 #include "AS_DCP.h"
 #include "KM_util.h"
@@ -93,3 +94,45 @@ Asset::mxf_path () const
        p /= _mxf_name;
        return p;
 }
+
+list<string>
+Asset::equals (Asset const & other, EqualityFlags flags) const
+{
+       list<string> notes;
+       
+       switch (flags) {
+       case LIBDCP_METADATA:
+               break;
+       case MXF_BITWISE:
+               if (filesystem::file_size (mxf_path()) != filesystem::file_size (other.mxf_path())) {
+                       notes.push_back (mxf_path().string() + " and " + other.mxf_path().string() + " sizes differ");
+                       return notes;
+               }
+               
+               ifstream a (mxf_path().c_str(), ios::binary);
+               ifstream b (other.mxf_path().c_str(), ios::binary);
+
+               int buffer_size = 65536;
+               char abuffer[buffer_size];
+               char bbuffer[buffer_size];
+
+               int n = filesystem::file_size (mxf_path ());
+
+               while (n) {
+                       int const t = min (n, buffer_size);
+                       a.read (abuffer, t);
+                       b.read (bbuffer, t);
+
+                       for (int i = 0; i < t; ++i) {
+                               if (abuffer[i] != bbuffer[i]) {
+                                       notes.push_back (mxf_path().string() + " and " + other.mxf_path().string() + " content differs");
+                                       return notes;
+                               }
+                       }
+
+                       n -= t;
+               }
+       }
+
+       return notes;
+}