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exif-loader.h
/*! \file exif-loader.h * \brief Defines the ExifLoader type */ /* * Copyright (c) 2003 Lutz Mueller <lutz@users.sourceforge.net> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301 USA. */ #ifndef LIBEXIF_EXIF_LOADER_H #define LIBEXIF_EXIF_LOADER_H #include <libexif/exif-data.h> #include <libexif/exif-log.h> #include <libexif/exif-mem.h> #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ /*! Data used by the loader interface */ typedef struct _ExifLoader ExifLoader; /*! Allocate a new #ExifLoader. * * \return allocated ExifLoader */ ExifLoader *exif_loader_new (void); /*! Allocate a new #ExifLoader using the specified memory allocator. * * \param[in] mem the ExifMem * \return allocated ExifLoader */ ExifLoader *exif_loader_new_mem (ExifMem *mem); /*! Increase the refcount of the #ExifLoader. * * \param[in] loader the ExifLoader to increase the refcount of. */ void exif_loader_ref (ExifLoader *loader); /*! Decrease the refcount of the #ExifLoader. * If the refcount reaches 0, the loader is freed. * * \param[in] loader ExifLoader for which to decrease the refcount */ void exif_loader_unref (ExifLoader *loader); /*! Load a file into the given #ExifLoader from the filesystem. * The relevant data is copied in raw form into the #ExifLoader. * * \param[in] loader loader to write to * \param[in] fname path to the file to read */ void exif_loader_write_file (ExifLoader *loader, const char *fname); /*! Load a buffer into the #ExifLoader from a memory buffer. * The relevant data is copied in raw form into the #ExifLoader. * * \param[in] loader loader to write to * \param[in] buf buffer to read from * \param[in] sz size of the buffer * \return 1 while EXIF data is read (or while there is still hope that * there will be EXIF data later on), 0 otherwise. */ unsigned char exif_loader_write (ExifLoader *loader, unsigned char *buf, unsigned int sz); /*! Free any data previously loaded and reset the #ExifLoader to its * newly-initialized state. * * \param[in] loader the loader */ void exif_loader_reset (ExifLoader *loader); /*! Create an #ExifData from the data in the loader. The loader must * already contain data from a previous call to #exif_loader_write_file * or #exif_loader_write. * * \note The #ExifData returned is created using its default options, which * may take effect before the data is returned. If other options are desired, * an #ExifData must be created explicitly and data extracted from the loader * using #exif_loader_get_buf instead. * * \param[in] loader the loader * \return allocated ExifData * * \see exif_loader_get_buf */ ExifData *exif_loader_get_data (ExifLoader *loader); /*! Return the raw data read by the loader. The returned pointer is only * guaranteed to be valid until the next call to a function modifying * this #ExifLoader. Either or both of buf and buf_size may be NULL on * entry, in which case that value is not returned. * * \param[in] loader the loader * \param[out] buf read-only pointer to the data read by the loader, or NULL * in case of error * \param[out] buf_size size of the data at buf, or 0 in case of error */ void exif_loader_get_buf (ExifLoader *loader, const unsigned char **buf, unsigned int *buf_size); /*! Set the log message object used by this #ExifLoader. * \param[in] loader the loader * \param[in] log #ExifLog */ void exif_loader_log (ExifLoader *loader, ExifLog *log); #ifdef __cplusplus } #endif /* __cplusplus */ #endif /* !defined(LIBEXIF_EXIF_LOADER_H) */