1 /*
2 * Copyright © 2009 Red Hat, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Red Hat Author(s): Behdad Esfahbod
25 */
26
27 #ifndef HB_H_IN
28 #error "Include <hb.h> instead."
29 #endif
30
31 #ifndef HB_BLOB_H
32 #define HB_BLOB_H
33
34 #include "hb-common.h"
35
36 HB_BEGIN_DECLS
37
38
39 /*
40 * Note re various memory-modes:
41 *
42 * - In no case shall the HarfBuzz client modify memory
43 * that is passed to HarfBuzz in a blob. If there is
44 * any such possibility, MODE_DUPLICATE should be used
45 * such that HarfBuzz makes a copy immediately,
46 *
47 * - Use MODE_READONLY otherse, unless you really really
48 * really know what you are doing,
49 *
50 * - MODE_WRITABLE is appropriate if you really made a
51 * copy of data solely for the purpose of passing to
52 * HarfBuzz and doing that just once (no reuse!),
53 *
54 * - If the font is mmap()ed, it's ok to use
55 * READONLY_MAY_MAKE_WRITABLE, however, using that mode
56 * correctly is very tricky. Use MODE_READONLY instead.
57 */
58 typedef enum {
59 HB_MEMORY_MODE_DUPLICATE,
60 HB_MEMORY_MODE_READONLY,
61 HB_MEMORY_MODE_WRITABLE,
62 HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE
63 } hb_memory_mode_t;
64
65 typedef struct hb_blob_t hb_blob_t;
66
67 hb_blob_t *
68 hb_blob_create (const char *data,
69 unsigned int length,
70 hb_memory_mode_t mode,
71 void *user_data,
72 hb_destroy_func_t destroy);
73
74 /* Always creates with MEMORY_MODE_READONLY.
75 * Even if the parent blob is writable, we don't
76 * want the user of the sub-blob to be able to
77 * modify the parent data as that data may be
78 * shared among multiple sub-blobs.
79 */
80 hb_blob_t *
81 hb_blob_create_sub_blob (hb_blob_t *parent,
82 unsigned int offset,
83 unsigned int length);
84
85 hb_blob_t *
86 hb_blob_get_empty (void);
87
88 hb_blob_t *
89 hb_blob_reference (hb_blob_t *blob);
90
91 void
92 hb_blob_destroy (hb_blob_t *blob);
93
94 hb_bool_t
95 hb_blob_set_user_data (hb_blob_t *blob,
96 hb_user_data_key_t *key,
97 void * data,
98 hb_destroy_func_t destroy,
99 hb_bool_t replace);
100
101
102 void *
103 hb_blob_get_user_data (hb_blob_t *blob,
104 hb_user_data_key_t *key);
105
106
107 void
108 hb_blob_make_immutable (hb_blob_t *blob);
109
110 hb_bool_t
111 hb_blob_is_immutable (hb_blob_t *blob);
112
113
114 unsigned int
115 hb_blob_get_length (hb_blob_t *blob);
116
117 const char *
118 hb_blob_get_data (hb_blob_t *blob, unsigned int *length);
119
120 char *
121 hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length);
122
123
124 HB_END_DECLS
125
126 #endif /* HB_BLOB_H */