text: /*
   * Copyright © 2009  Red Hat, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Red Hat Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_H_IN
  #error "Include <hb.h> instead."
  #endif
  
  #ifndef HB_BLOB_H
  #define HB_BLOB_H
  
  #include "hb-common.h"
  
  HB_BEGIN_DECLS
  
  
  /*
   * Note re various memory-modes:
   *
   * - In no case shall the HarfBuzz client modify memory
   *   that is passed to HarfBuzz in a blob.  If there is
   *   any such possibility, MODE_DUPLICATE should be used
   *   such that HarfBuzz makes a copy immediately,
   *
   * - Use MODE_READONLY otherwise, unless you really really
   *   really know what you are doing,
   *
   * - MODE_WRITABLE is appropriate if you really made a
   *   copy of data solely for the purpose of passing to
   *   HarfBuzz and doing that just once (no reuse!),
   *
   * - If the font is mmap()ed, it's ok to use
   *   READONLY_MAY_MAKE_WRITABLE, however, using that mode
   *   correctly is very tricky.  Use MODE_READONLY instead.
   */
  typedef enum {
    HB_MEMORY_MODE_DUPLICATE,
    HB_MEMORY_MODE_READONLY,
    HB_MEMORY_MODE_WRITABLE,
    HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE
  } hb_memory_mode_t;
  
  typedef struct hb_blob_t hb_blob_t;
  
  HB_EXTERN hb_blob_t *
  hb_blob_create (const char        *data,
  		unsigned int       length,
  		hb_memory_mode_t   mode,
  		void              *user_data,
  		hb_destroy_func_t  destroy);
  
  /* Always creates with MEMORY_MODE_READONLY.
   * Even if the parent blob is writable, we don't
   * want the user of the sub-blob to be able to
   * modify the parent data as that data may be
   * shared among multiple sub-blobs.
   */
  HB_EXTERN hb_blob_t *
  hb_blob_create_sub_blob (hb_blob_t    *parent,
  			 unsigned int  offset,
  			 unsigned int  length);
  
  HB_EXTERN hb_blob_t *
  hb_blob_copy_writable_or_fail (hb_blob_t *blob);
  
  HB_EXTERN hb_blob_t *
  hb_blob_get_empty (void);
  
  HB_EXTERN hb_blob_t *
  hb_blob_reference (hb_blob_t *blob);
  
  HB_EXTERN void
  hb_blob_destroy (hb_blob_t *blob);
  
  HB_EXTERN hb_bool_t
  hb_blob_set_user_data (hb_blob_t          *blob,
  		       hb_user_data_key_t *key,
  		       void *              data,
  		       hb_destroy_func_t   destroy,
  		       hb_bool_t           replace);
  
  
  HB_EXTERN void *
  hb_blob_get_user_data (hb_blob_t          *blob,
  		       hb_user_data_key_t *key);
  
  
  HB_EXTERN void
  hb_blob_make_immutable (hb_blob_t *blob);
  
  HB_EXTERN hb_bool_t
  hb_blob_is_immutable (hb_blob_t *blob);
  
  
  HB_EXTERN unsigned int
  hb_blob_get_length (hb_blob_t *blob);
  
  HB_EXTERN const char *
  hb_blob_get_data (hb_blob_t *blob, unsigned int *length);
  
  HB_EXTERN char *
  hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length);
  
  HB_EXTERN hb_blob_t *
  hb_blob_create_from_file (const char *file_name);
  
  HB_END_DECLS
  
  #endif /* HB_BLOB_H */
  