asfvideo: replace memcpy and byteSwap

We can just treat the data as big endian with bit shifting and ORing.

Signed-off-by: Rosen Penev <[email protected]>

Author: neheb

src/asfvideo.cpp

@@ -44,15 +44,10 @@ bool AsfVideo::GUIDTag::operator==(const AsfVideo::GUIDTag& other) const {
 }
 
 AsfVideo::GUIDTag::GUIDTag(const uint8_t* bytes) {
-  std::memcpy(&data1_, bytes, DWORD);
-  std::memcpy(&data2_, bytes + DWORD, WORD);
-  std::memcpy(&data3_, bytes + DWORD + WORD, WORD);
+  data1_ = Exiv2::getULong(bytes, ByteOrder::littleEndian);
+  data2_ = Exiv2::getUShort(bytes + DWORD, ByteOrder::littleEndian);
+  data3_ = Exiv2::getUShort(bytes + DWORD + WORD, ByteOrder::littleEndian);
   std::copy(bytes + QWORD, bytes + (2 * QWORD), data4_.begin());
-  if (isBigEndianPlatform()) {
-    data1_ = byteSwap(data1_, true);
-    data2_ = byteSwap(data2_, true);
-    data3_ = byteSwap(data3_, true);
-  }
 }
 
 std::string AsfVideo::GUIDTag::to_string() const {