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_EXTERN 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_EXTERN hb_blob_t * 81 hb_blob_create_sub_blob (hb_blob_t *parent, 82 unsigned int offset, 83 unsigned int length); 84 85 HB_EXTERN hb_blob_t * 86 hb_blob_get_empty (void); 87 88 HB_EXTERN hb_blob_t * 89 hb_blob_reference (hb_blob_t *blob); 90 91 HB_EXTERN void 92 hb_blob_destroy (hb_blob_t *blob); 93 94 HB_EXTERN 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 HB_EXTERN void * 103 hb_blob_get_user_data (hb_blob_t *blob, 104 hb_user_data_key_t *key); 105 106 107 HB_EXTERN void 108 hb_blob_make_immutable (hb_blob_t *blob); 109 110 HB_EXTERN hb_bool_t 111 hb_blob_is_immutable (hb_blob_t *blob); 112 113 114 HB_EXTERN unsigned int 115 hb_blob_get_length (hb_blob_t *blob); 116 117 HB_EXTERN const char * 118 hb_blob_get_data (hb_blob_t *blob, unsigned int *length); 119 120 HB_EXTERN 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 */ 127
