Initial support for OM System MakerNote

src/makernote_int.cpp

@@ -130,6 +130,7 @@ namespace Exiv2 {
         { "Minolta",        minoltaId,   newIfdMn,       newIfdMn2       },
         { "NIKON",          ifdIdNotSet, newNikonMn,     0               }, // mnGroup_ is not used
         { "OLYMPUS",        ifdIdNotSet, newOlympusMn,   0               }, // mnGroup_ is not used
+        { "OM Digital",     olympus2Id,  newOMSystemMn,  newOMSystemMn2  },
         { "Panasonic",      panasonicId, newPanasonicMn, newPanasonicMn2 },
         { "PENTAX",         ifdIdNotSet, newPentaxMn,    0               }, // mnGroup_ is not used
         { "RICOH",          ifdIdNotSet, newPentaxMn,    0               }, // mnGroup_ is not used
@@ -330,6 +331,60 @@ namespace Exiv2 {
         return sizeOfSignature();
     } // Olympus2MnHeader::write
 
+    const byte OMSystemMnHeader::signature_[] = {
+        'O', 'M', ' ', 'S', 'Y', 'S', 'T',  'E', 'M', 0x00, 0x00, 0x00, 'I', 'I', 0x04, 0x00
+    };
+
+    uint32_t OMSystemMnHeader::sizeOfSignature()
+    {
+        return sizeof(signature_);
+    }
+
+    OMSystemMnHeader::OMSystemMnHeader()
+    {
+        read(signature_, sizeOfSignature(), invalidByteOrder);
+    }
+
+    OMSystemMnHeader::~OMSystemMnHeader()
+    {
+    }
+
+    uint32_t OMSystemMnHeader::size() const
+    {
+        return header_.size_;
+    }
+
+    uint32_t OMSystemMnHeader::ifdOffset() const
+    {
+        return sizeOfSignature();
+    }
+
+    uint32_t OMSystemMnHeader::baseOffset(uint32_t mnOffset) const
+    {
+        return mnOffset;
+    }
+
+    bool OMSystemMnHeader::read(const byte* pData,
+                                uint32_t size,
+                                ByteOrder /*byteOrder*/)
+    {
+        if (!pData || size < sizeOfSignature()) return false;
+        header_.alloc(sizeOfSignature());
+        std::memcpy(header_.pData_, pData, header_.size_);
+        if (   static_cast<uint32_t>(header_.size_) < sizeOfSignature()
+            || 0 != memcmp(header_.pData_, signature_, sizeOfSignature() - 2)) {
+            return false;
+        }
+        return true;
+    } // OMSystemMnHeader::read
+
+    uint32_t OMSystemMnHeader::write(IoWrapper& ioWrapper,
+                                    ByteOrder /*byteOrder*/) const
+    {
+        ioWrapper.write(signature_, sizeOfSignature());
+        return sizeOfSignature();
+    } // OMSystemMnHeader::write
+
     const byte FujiMnHeader::signature_[] = {
         'F', 'U', 'J', 'I', 'F', 'I', 'L', 'M', 0x0c, 0x00, 0x00, 0x00
     };
@@ -900,6 +955,25 @@ namespace Exiv2 {
         return new TiffIfdMakernote(tag, group, mnGroup, new Olympus2MnHeader);
     }
 
+    TiffComponent* newOMSystemMn(uint16_t    tag,
+                                 IfdId       group,
+                                 IfdId       mnGroup,
+                                 const byte* /*pData*/,
+                                 uint32_t    size,
+                                 ByteOrder   /*byteOrder*/)
+    {
+        // Require at least the header and an IFD with 1 entry
+        if (size < OMSystemMnHeader::sizeOfSignature() + 18) return 0;
+        return newOMSystemMn2(tag, group, mnGroup);
+    }
+
+    TiffComponent* newOMSystemMn2(uint16_t tag,
+                                  IfdId    group,
+                                  IfdId    mnGroup)
+    {
+        return new TiffIfdMakernote(tag, group, mnGroup, new OMSystemMnHeader);
+    }
+
     TiffComponent* newFujiMn(uint16_t    tag,
                              IfdId       group,
                              IfdId       mnGroup,

src/makernote_int.hpp

@@ -232,6 +232,38 @@ namespace Exiv2 {
 
     }; // class Olympus2MnHeader
 
+    //! Header of an OM Digital Solutions (ex Olympus) Makernote
+    class OMSystemMnHeader : public MnHeader {
+    public:
+        //! @name Creators
+        //@{
+        //! Default constructor
+        OMSystemMnHeader();
+        //! Virtual destructor.
+        virtual ~OMSystemMnHeader();
+        //@}
+        //! @name Manipulators
+        //@{
+        virtual bool read(const byte* pData,
+                          uint32_t    size,
+                          ByteOrder   byteOrder);
+        //@}
+        //! @name Accessors
+        //@{
+        virtual uint32_t size() const;
+        virtual uint32_t write(IoWrapper& ioWrapper, ByteOrder byteOrder) const;
+        virtual uint32_t ifdOffset() const;
+        virtual uint32_t baseOffset(uint32_t mnOffset) const;
+        //@}
+        //! Return the size of the makernote header signature
+        static uint32_t sizeOfSignature();
+
+    private:
+        DataBuf header_;                //!< Data buffer for the makernote header
+        static const byte signature_[]; //!< OM Digital Solutions makernote header signature
+
+    }; // class OMSystemMnHeader
+
     //! Header of a Fujifilm Makernote
     class FujiMnHeader : public MnHeader {
     public:
@@ -587,6 +619,19 @@ namespace Exiv2 {
                                  IfdId     group,
                                  IfdId     mnGroup);
 
+    //! Function to create an OM Digital Solutions makernote
+    TiffComponent* newOMSystemMn(uint16_t    tag,
+                                 IfdId       group,
+                                 IfdId       mnGroup,
+                                 const byte* pData,
+                                 uint32_t    size,
+                                 ByteOrder   byteOrder);
+
+    //! Function to create a OM Digital Solutions makernote
+    TiffComponent* newOMSystemMn2(uint16_t tag,
+                                  IfdId    group,
+                                  IfdId    mnGroup);
+
     //! Function to create a Fujifilm makernote
     TiffComponent* newFujiMn(uint16_t    tag,
                              IfdId       group,

tests/bugfixes/github/test_issue_2126.py

@@ -0,0 +1,15 @@
+from system_tests import CaseMeta, path
+
+class OMSystemMakerNote(metaclass=CaseMeta):
+    """
+    Regression test for the bug described in:
+    https://github.com/Exiv2/exiv2/issues/2126
+    """
+    url = "https://github.com/Exiv2/exiv2/issues/2126"
+
+    filename = path("$data_path/test_issue_2126.exv")
+    commands = ["$exiv2 -q -K Exif.Olympus2.CameraID $filename"]
+    stdout = ["""Exif.Olympus2.CameraID                       Undefined  32  OM SYSTEM CAMERA               
+"""]
+    stderr = [""]
+    retval = [0]