LibexifCustomMakernotes.h

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// SPDX-License-Identifier: BSD-3-Clause
// SPDX-FileCopyrightText: Czech Technical University in Prague
 
#pragma once
 
#include <functional>
#include <memory>
#include <string>
#include <unordered_map>
 
#include <libexif/exif-data.h>
#include <libexif/exif-mnote-data.h>
 
// A few struct definitions from libexif had to be copied here because they are defined in headers which are not
// installed. libexif is issued under LGPL, but I hope just copying the structs (aka API) does not necessarily mean
// this whole would need to be under LGPL.
 
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
 
#include <libexif/exif-byte-order.h>
#include <libexif/exif-log.h>
 
typedef struct _ExifMnoteDataMethods ExifMnoteDataMethods;
 
struct _ExifMnoteDataMethods {
  /* Life cycle */
  void (* free) (ExifMnoteData *);  // NOLINT
 
  /* Modification */
  void (* save) (ExifMnoteData *, unsigned char **, unsigned int *);  // NOLINT
  void (* load) (ExifMnoteData *, const unsigned char *, unsigned int);  // NOLINT
  void (* set_offset)     (ExifMnoteData *, unsigned int);  // NOLINT
  void (* set_byte_order) (ExifMnoteData *, ExifByteOrder);  // NOLINT
 
  /* Query */
  unsigned int (* count)           (ExifMnoteData *);  // NOLINT
  unsigned int (* get_id)          (ExifMnoteData *, unsigned int);  // NOLINT
  const char * (* get_name)        (ExifMnoteData *, unsigned int);  // NOLINT
  const char * (* get_title)       (ExifMnoteData *, unsigned int);  // NOLINT
  const char * (* get_description) (ExifMnoteData *, unsigned int);  // NOLINT
  char * (* get_value)             (ExifMnoteData *, unsigned int, char *val, unsigned int maxlen);  // NOLINT
};
 
typedef struct _ExifMnoteDataPriv ExifMnoteDataPriv;
 
struct _ExifMnoteData
{
  ExifMnoteDataPriv *priv;
 
  ExifMnoteDataMethods methods;
 
  /* Logging */
  ExifLog *log;
 
  /* Memory management */
  ExifMem *mem;
};
 
void exif_mnote_data_construct      (ExifMnoteData *, ExifMem *mem);  // NOLINT
 
void exif_mnote_data_set_byte_order (ExifMnoteData *, ExifByteOrder);  // NOLINT
 
void exif_mnote_data_set_offset     (ExifMnoteData *, unsigned int);  // NOLINT
 
#ifdef __cplusplus
}
#endif /* __cplusplus */
 
namespace movie_publisher
{
struct LibexifCustomMakerNote
{
  std::function<int(const ::ExifData* exifData, const ::ExifEntry* exifEntry)> identify;
 
  std::function<::ExifMnoteData*(::ExifMem* mem)> create;
};
 
class LibexifCustomMakernotes
{
public:
  LibexifCustomMakernotes();
 
  std::unordered_map<std::string, LibexifCustomMakerNote> customMakerNotes;
};
 
}