Add libexif to deps/third_party.

libexif/sources/libexif/exif-mem.h

+/*! \file exif-mem.h
+ *  \brief Define the ExifMem data type and the associated functions.
+ *  ExifMem defines the memory management functions used within libexif.
+ */
+/* exif-mem.h
+ *
+ * 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 __EXIF_MEM_H__
+#define __EXIF_MEM_H__
+
+#include <libexif/exif-utils.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/*! Should work like calloc()
+ *
+ *  \param[in] s the size of the block to allocate.
+ *  \return the allocated memory and initialized. 
+ */
+typedef void * (* ExifMemAllocFunc)   (ExifLong s);
+
+/*! Should work like realloc()
+ *
+ * \param[in] p the pointer to reallocate
+ * \param[in] s the size of the reallocated block
+ * \return allocated memory 
+ */
+typedef void * (* ExifMemReallocFunc) (void *p, ExifLong s);
+
+/*! Free method for ExifMem
+ *
+ * \param[in] p the pointer to free
+ * \return the freed pointer
+ */
+typedef void   (* ExifMemFreeFunc)    (void *p);
+
+/*! ExifMem define a memory allocator */
+typedef struct _ExifMem ExifMem;
+
+/*! Create a new ExifMem
+ *
+ * \param[in] a the allocator function
+ * \param[in] r the reallocator function
+ * \param[in] f the free function
+ */
+ExifMem *exif_mem_new   (ExifMemAllocFunc a, ExifMemReallocFunc r,
+                         ExifMemFreeFunc f);
+/*! Refcount an ExifMem
+ */
+void     exif_mem_ref   (ExifMem *);
+
+/*! Unrefcount an ExifMem.
+ * If the refcount reaches 0, the ExifMem is freed
+ */
+void     exif_mem_unref (ExifMem *);
+
+void *exif_mem_alloc   (ExifMem *m, ExifLong s);
+void *exif_mem_realloc (ExifMem *m, void *p, ExifLong s);
+void  exif_mem_free    (ExifMem *m, void *p);
+
+/*! Create a new ExifMem with default values for your convenience
+ *
+ * \return return a new default ExifMem
+ */
+ExifMem *exif_mem_new_default (void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __EXIF_MEM_H__ */