/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

// This file is available under and governed by the GNU General Public
// License version 2 only, as published by the Free Software Foundation.
// However, the following notice accompanied the original version of this
// file:
//
/*
 * 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 otherse, 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_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_blob_t *
hb_blob_create_sub_blob (hb_blob_t    *parent,
                         unsigned int  offset,
                         unsigned int  length);

hb_blob_t *
hb_blob_get_empty (void);

hb_blob_t *
hb_blob_reference (hb_blob_t *blob);

void
hb_blob_destroy (hb_blob_t *blob);

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);


void *
hb_blob_get_user_data (hb_blob_t          *blob,
                       hb_user_data_key_t *key);


void
hb_blob_make_immutable (hb_blob_t *blob);

hb_bool_t
hb_blob_is_immutable (hb_blob_t *blob);


unsigned int
hb_blob_get_length (hb_blob_t *blob);

const char *
hb_blob_get_data (hb_blob_t *blob, unsigned int *length);

char *
hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length);


HB_END_DECLS

#endif /* HB_BLOB_H */