1 /*
   2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.  Oracle designates this
   7  * particular file as subject to the "Classpath" exception as provided
   8  * by Oracle in the LICENSE file that accompanied this code.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  */
  24 
  25 // This file is available under and governed by the GNU General Public
  26 // License version 2 only, as published by the Free Software Foundation.
  27 // However, the following notice accompanied the original version of this
  28 // file:
  29 //
  30 /*
  31  * Copyright © 2007,2008,2009  Red Hat, Inc.
  32  * Copyright © 2011,2012  Google, Inc.
  33  *
  34  *  This is part of HarfBuzz, a text shaping library.
  35  *
  36  * Permission is hereby granted, without written agreement and without
  37  * license or royalty fees, to use, copy, modify, and distribute this
  38  * software and its documentation for any purpose, provided that the
  39  * above copyright notice and the following two paragraphs appear in
  40  * all copies of this software.
  41  *
  42  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  43  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  44  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  45  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  46  * DAMAGE.
  47  *
  48  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  49  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  50  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  51  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  52  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  53  *
  54  * Red Hat Author(s): Behdad Esfahbod
  55  * Google Author(s): Behdad Esfahbod
  56  */
  57 
  58 #ifndef HB_H_IN
  59 #error "Include <hb.h> instead."
  60 #endif
  61 
  62 #ifndef HB_COMMON_H
  63 #define HB_COMMON_H
  64 
  65 #ifndef HB_BEGIN_DECLS
  66 # ifdef __cplusplus
  67 #  define HB_BEGIN_DECLS        extern "C" {
  68 #  define HB_END_DECLS          }
  69 # else /* !__cplusplus */
  70 #  define HB_BEGIN_DECLS
  71 #  define HB_END_DECLS
  72 # endif /* !__cplusplus */
  73 #endif
  74 
  75 #if !defined (HB_DONT_DEFINE_STDINT)
  76 
  77 #if defined (_SVR4) || defined (SVR4) || defined (__OpenBSD__) || \
  78     defined (_sgi) || defined (__sun) || defined (sun) || \
  79     defined (__digital__) || defined (__HP_cc)
  80 #  include <inttypes.h>
  81 #elif defined (_AIX)
  82 #  include <sys/inttypes.h>
  83 /* VS 2010 (_MSC_VER 1600) has stdint.h */
  84 #elif defined (_MSC_VER) && _MSC_VER < 1600
  85 typedef __int8 int8_t;
  86 typedef unsigned __int8 uint8_t;
  87 typedef __int16 int16_t;
  88 typedef unsigned __int16 uint16_t;
  89 typedef __int32 int32_t;
  90 typedef unsigned __int32 uint32_t;
  91 typedef __int64 int64_t;
  92 typedef unsigned __int64 uint64_t;
  93 #else
  94 #  include <stdint.h>
  95 #endif
  96 
  97 #endif
  98 
  99 HB_BEGIN_DECLS
 100 
 101 
 102 typedef int hb_bool_t;
 103 
 104 typedef uint32_t hb_codepoint_t;
 105 typedef int32_t hb_position_t;
 106 typedef uint32_t hb_mask_t;
 107 
 108 typedef union _hb_var_int_t {
 109   uint32_t u32;
 110   int32_t i32;
 111   uint16_t u16[2];
 112   int16_t i16[2];
 113   uint8_t u8[4];
 114   int8_t i8[4];
 115 } hb_var_int_t;
 116 
 117 
 118 /* hb_tag_t */
 119 
 120 typedef uint32_t hb_tag_t;
 121 
 122 #define HB_TAG(c1,c2,c3,c4) ((hb_tag_t)((((uint8_t)(c1))<<24)|(((uint8_t)(c2))<<16)|(((uint8_t)(c3))<<8)|((uint8_t)(c4))))
 123 #define HB_UNTAG(tag)   ((uint8_t)((tag)>>24)), ((uint8_t)((tag)>>16)), ((uint8_t)((tag)>>8)), ((uint8_t)(tag))
 124 
 125 #define HB_TAG_NONE HB_TAG(0,0,0,0)
 126 #define HB_TAG_MAX HB_TAG(0xff,0xff,0xff,0xff)
 127 #define HB_TAG_MAX_SIGNED HB_TAG(0x7f,0xff,0xff,0xff)
 128 
 129 /* len=-1 means str is NUL-terminated. */
 130 hb_tag_t
 131 hb_tag_from_string (const char *str, int len);
 132 
 133 /* buf should have 4 bytes. */
 134 void
 135 hb_tag_to_string (hb_tag_t tag, char *buf);
 136 
 137 
 138 /* hb_direction_t */
 139 
 140 typedef enum {
 141   HB_DIRECTION_INVALID = 0,
 142   HB_DIRECTION_LTR = 4,
 143   HB_DIRECTION_RTL,
 144   HB_DIRECTION_TTB,
 145   HB_DIRECTION_BTT
 146 } hb_direction_t;
 147 
 148 /* len=-1 means str is NUL-terminated */
 149 hb_direction_t
 150 hb_direction_from_string (const char *str, int len);
 151 
 152 const char *
 153 hb_direction_to_string (hb_direction_t direction);
 154 
 155 #define HB_DIRECTION_IS_VALID(dir)      ((((unsigned int) (dir)) & ~3U) == 4)
 156 /* Direction must be valid for the following */
 157 #define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int) (dir)) & ~1U) == 4)
 158 #define HB_DIRECTION_IS_VERTICAL(dir)   ((((unsigned int) (dir)) & ~1U) == 6)
 159 #define HB_DIRECTION_IS_FORWARD(dir)    ((((unsigned int) (dir)) & ~2U) == 4)
 160 #define HB_DIRECTION_IS_BACKWARD(dir)   ((((unsigned int) (dir)) & ~2U) == 5)
 161 #define HB_DIRECTION_REVERSE(dir)       ((hb_direction_t) (((unsigned int) (dir)) ^ 1))
 162 
 163 
 164 /* hb_language_t */
 165 
 166 typedef const struct hb_language_impl_t *hb_language_t;
 167 
 168 /* len=-1 means str is NUL-terminated */
 169 hb_language_t
 170 hb_language_from_string (const char *str, int len);
 171 
 172 const char *
 173 hb_language_to_string (hb_language_t language);
 174 
 175 #define HB_LANGUAGE_INVALID ((hb_language_t) NULL)
 176 
 177 hb_language_t
 178 hb_language_get_default (void);
 179 
 180 
 181 /* hb_script_t */
 182 
 183 /* http://unicode.org/iso15924/ */
 184 /* http://goo.gl/x9ilM */
 185 /* Unicode Character Database property: Script (sc) */
 186 typedef enum
 187 {
 188   /*1.1*/ HB_SCRIPT_COMMON                      = HB_TAG ('Z','y','y','y'),
 189   /*1.1*/ HB_SCRIPT_INHERITED                   = HB_TAG ('Z','i','n','h'),
 190   /*5.0*/ HB_SCRIPT_UNKNOWN                     = HB_TAG ('Z','z','z','z'),
 191 
 192   /*1.1*/ HB_SCRIPT_ARABIC                      = HB_TAG ('A','r','a','b'),
 193   /*1.1*/ HB_SCRIPT_ARMENIAN                    = HB_TAG ('A','r','m','n'),
 194   /*1.1*/ HB_SCRIPT_BENGALI                     = HB_TAG ('B','e','n','g'),
 195   /*1.1*/ HB_SCRIPT_CYRILLIC                    = HB_TAG ('C','y','r','l'),
 196   /*1.1*/ HB_SCRIPT_DEVANAGARI                  = HB_TAG ('D','e','v','a'),
 197   /*1.1*/ HB_SCRIPT_GEORGIAN                    = HB_TAG ('G','e','o','r'),
 198   /*1.1*/ HB_SCRIPT_GREEK                       = HB_TAG ('G','r','e','k'),
 199   /*1.1*/ HB_SCRIPT_GUJARATI                    = HB_TAG ('G','u','j','r'),
 200   /*1.1*/ HB_SCRIPT_GURMUKHI                    = HB_TAG ('G','u','r','u'),
 201   /*1.1*/ HB_SCRIPT_HANGUL                      = HB_TAG ('H','a','n','g'),
 202   /*1.1*/ HB_SCRIPT_HAN                         = HB_TAG ('H','a','n','i'),
 203   /*1.1*/ HB_SCRIPT_HEBREW                      = HB_TAG ('H','e','b','r'),
 204   /*1.1*/ HB_SCRIPT_HIRAGANA                    = HB_TAG ('H','i','r','a'),
 205   /*1.1*/ HB_SCRIPT_KANNADA                     = HB_TAG ('K','n','d','a'),
 206   /*1.1*/ HB_SCRIPT_KATAKANA                    = HB_TAG ('K','a','n','a'),
 207   /*1.1*/ HB_SCRIPT_LAO                         = HB_TAG ('L','a','o','o'),
 208   /*1.1*/ HB_SCRIPT_LATIN                       = HB_TAG ('L','a','t','n'),
 209   /*1.1*/ HB_SCRIPT_MALAYALAM                   = HB_TAG ('M','l','y','m'),
 210   /*1.1*/ HB_SCRIPT_ORIYA                       = HB_TAG ('O','r','y','a'),
 211   /*1.1*/ HB_SCRIPT_TAMIL                       = HB_TAG ('T','a','m','l'),
 212   /*1.1*/ HB_SCRIPT_TELUGU                      = HB_TAG ('T','e','l','u'),
 213   /*1.1*/ HB_SCRIPT_THAI                        = HB_TAG ('T','h','a','i'),
 214 
 215   /*2.0*/ HB_SCRIPT_TIBETAN                     = HB_TAG ('T','i','b','t'),
 216 
 217   /*3.0*/ HB_SCRIPT_BOPOMOFO                    = HB_TAG ('B','o','p','o'),
 218   /*3.0*/ HB_SCRIPT_BRAILLE                     = HB_TAG ('B','r','a','i'),
 219   /*3.0*/ HB_SCRIPT_CANADIAN_SYLLABICS          = HB_TAG ('C','a','n','s'),
 220   /*3.0*/ HB_SCRIPT_CHEROKEE                    = HB_TAG ('C','h','e','r'),
 221   /*3.0*/ HB_SCRIPT_ETHIOPIC                    = HB_TAG ('E','t','h','i'),
 222   /*3.0*/ HB_SCRIPT_KHMER                       = HB_TAG ('K','h','m','r'),
 223   /*3.0*/ HB_SCRIPT_MONGOLIAN                   = HB_TAG ('M','o','n','g'),
 224   /*3.0*/ HB_SCRIPT_MYANMAR                     = HB_TAG ('M','y','m','r'),
 225   /*3.0*/ HB_SCRIPT_OGHAM                       = HB_TAG ('O','g','a','m'),
 226   /*3.0*/ HB_SCRIPT_RUNIC                       = HB_TAG ('R','u','n','r'),
 227   /*3.0*/ HB_SCRIPT_SINHALA                     = HB_TAG ('S','i','n','h'),
 228   /*3.0*/ HB_SCRIPT_SYRIAC                      = HB_TAG ('S','y','r','c'),
 229   /*3.0*/ HB_SCRIPT_THAANA                      = HB_TAG ('T','h','a','a'),
 230   /*3.0*/ HB_SCRIPT_YI                          = HB_TAG ('Y','i','i','i'),
 231 
 232   /*3.1*/ HB_SCRIPT_DESERET                     = HB_TAG ('D','s','r','t'),
 233   /*3.1*/ HB_SCRIPT_GOTHIC                      = HB_TAG ('G','o','t','h'),
 234   /*3.1*/ HB_SCRIPT_OLD_ITALIC                  = HB_TAG ('I','t','a','l'),
 235 
 236   /*3.2*/ HB_SCRIPT_BUHID                       = HB_TAG ('B','u','h','d'),
 237   /*3.2*/ HB_SCRIPT_HANUNOO                     = HB_TAG ('H','a','n','o'),
 238   /*3.2*/ HB_SCRIPT_TAGALOG                     = HB_TAG ('T','g','l','g'),
 239   /*3.2*/ HB_SCRIPT_TAGBANWA                    = HB_TAG ('T','a','g','b'),
 240 
 241   /*4.0*/ HB_SCRIPT_CYPRIOT                     = HB_TAG ('C','p','r','t'),
 242   /*4.0*/ HB_SCRIPT_LIMBU                       = HB_TAG ('L','i','m','b'),
 243   /*4.0*/ HB_SCRIPT_LINEAR_B                    = HB_TAG ('L','i','n','b'),
 244   /*4.0*/ HB_SCRIPT_OSMANYA                     = HB_TAG ('O','s','m','a'),
 245   /*4.0*/ HB_SCRIPT_SHAVIAN                     = HB_TAG ('S','h','a','w'),
 246   /*4.0*/ HB_SCRIPT_TAI_LE                      = HB_TAG ('T','a','l','e'),
 247   /*4.0*/ HB_SCRIPT_UGARITIC                    = HB_TAG ('U','g','a','r'),
 248 
 249   /*4.1*/ HB_SCRIPT_BUGINESE                    = HB_TAG ('B','u','g','i'),
 250   /*4.1*/ HB_SCRIPT_COPTIC                      = HB_TAG ('C','o','p','t'),
 251   /*4.1*/ HB_SCRIPT_GLAGOLITIC                  = HB_TAG ('G','l','a','g'),
 252   /*4.1*/ HB_SCRIPT_KHAROSHTHI                  = HB_TAG ('K','h','a','r'),
 253   /*4.1*/ HB_SCRIPT_NEW_TAI_LUE                 = HB_TAG ('T','a','l','u'),
 254   /*4.1*/ HB_SCRIPT_OLD_PERSIAN                 = HB_TAG ('X','p','e','o'),
 255   /*4.1*/ HB_SCRIPT_SYLOTI_NAGRI                = HB_TAG ('S','y','l','o'),
 256   /*4.1*/ HB_SCRIPT_TIFINAGH                    = HB_TAG ('T','f','n','g'),
 257 
 258   /*5.0*/ HB_SCRIPT_BALINESE                    = HB_TAG ('B','a','l','i'),
 259   /*5.0*/ HB_SCRIPT_CUNEIFORM                   = HB_TAG ('X','s','u','x'),
 260   /*5.0*/ HB_SCRIPT_NKO                         = HB_TAG ('N','k','o','o'),
 261   /*5.0*/ HB_SCRIPT_PHAGS_PA                    = HB_TAG ('P','h','a','g'),
 262   /*5.0*/ HB_SCRIPT_PHOENICIAN                  = HB_TAG ('P','h','n','x'),
 263 
 264   /*5.1*/ HB_SCRIPT_CARIAN                      = HB_TAG ('C','a','r','i'),
 265   /*5.1*/ HB_SCRIPT_CHAM                        = HB_TAG ('C','h','a','m'),
 266   /*5.1*/ HB_SCRIPT_KAYAH_LI                    = HB_TAG ('K','a','l','i'),
 267   /*5.1*/ HB_SCRIPT_LEPCHA                      = HB_TAG ('L','e','p','c'),
 268   /*5.1*/ HB_SCRIPT_LYCIAN                      = HB_TAG ('L','y','c','i'),
 269   /*5.1*/ HB_SCRIPT_LYDIAN                      = HB_TAG ('L','y','d','i'),
 270   /*5.1*/ HB_SCRIPT_OL_CHIKI                    = HB_TAG ('O','l','c','k'),
 271   /*5.1*/ HB_SCRIPT_REJANG                      = HB_TAG ('R','j','n','g'),
 272   /*5.1*/ HB_SCRIPT_SAURASHTRA                  = HB_TAG ('S','a','u','r'),
 273   /*5.1*/ HB_SCRIPT_SUNDANESE                   = HB_TAG ('S','u','n','d'),
 274   /*5.1*/ HB_SCRIPT_VAI                         = HB_TAG ('V','a','i','i'),
 275 
 276   /*5.2*/ HB_SCRIPT_AVESTAN                     = HB_TAG ('A','v','s','t'),
 277   /*5.2*/ HB_SCRIPT_BAMUM                       = HB_TAG ('B','a','m','u'),
 278   /*5.2*/ HB_SCRIPT_EGYPTIAN_HIEROGLYPHS        = HB_TAG ('E','g','y','p'),
 279   /*5.2*/ HB_SCRIPT_IMPERIAL_ARAMAIC            = HB_TAG ('A','r','m','i'),
 280   /*5.2*/ HB_SCRIPT_INSCRIPTIONAL_PAHLAVI       = HB_TAG ('P','h','l','i'),
 281   /*5.2*/ HB_SCRIPT_INSCRIPTIONAL_PARTHIAN      = HB_TAG ('P','r','t','i'),
 282   /*5.2*/ HB_SCRIPT_JAVANESE                    = HB_TAG ('J','a','v','a'),
 283   /*5.2*/ HB_SCRIPT_KAITHI                      = HB_TAG ('K','t','h','i'),
 284   /*5.2*/ HB_SCRIPT_LISU                        = HB_TAG ('L','i','s','u'),
 285   /*5.2*/ HB_SCRIPT_MEETEI_MAYEK                = HB_TAG ('M','t','e','i'),
 286   /*5.2*/ HB_SCRIPT_OLD_SOUTH_ARABIAN           = HB_TAG ('S','a','r','b'),
 287   /*5.2*/ HB_SCRIPT_OLD_TURKIC                  = HB_TAG ('O','r','k','h'),
 288   /*5.2*/ HB_SCRIPT_SAMARITAN                   = HB_TAG ('S','a','m','r'),
 289   /*5.2*/ HB_SCRIPT_TAI_THAM                    = HB_TAG ('L','a','n','a'),
 290   /*5.2*/ HB_SCRIPT_TAI_VIET                    = HB_TAG ('T','a','v','t'),
 291 
 292   /*6.0*/ HB_SCRIPT_BATAK                       = HB_TAG ('B','a','t','k'),
 293   /*6.0*/ HB_SCRIPT_BRAHMI                      = HB_TAG ('B','r','a','h'),
 294   /*6.0*/ HB_SCRIPT_MANDAIC                     = HB_TAG ('M','a','n','d'),
 295 
 296   /*6.1*/ HB_SCRIPT_CHAKMA                      = HB_TAG ('C','a','k','m'),
 297   /*6.1*/ HB_SCRIPT_MEROITIC_CURSIVE            = HB_TAG ('M','e','r','c'),
 298   /*6.1*/ HB_SCRIPT_MEROITIC_HIEROGLYPHS        = HB_TAG ('M','e','r','o'),
 299   /*6.1*/ HB_SCRIPT_MIAO                        = HB_TAG ('P','l','r','d'),
 300   /*6.1*/ HB_SCRIPT_SHARADA                     = HB_TAG ('S','h','r','d'),
 301   /*6.1*/ HB_SCRIPT_SORA_SOMPENG                = HB_TAG ('S','o','r','a'),
 302   /*6.1*/ HB_SCRIPT_TAKRI                       = HB_TAG ('T','a','k','r'),
 303 
 304   /*
 305    * Since: 0.9.30
 306    */
 307   /*7.0*/ HB_SCRIPT_BASSA_VAH                   = HB_TAG ('B','a','s','s'),
 308   /*7.0*/ HB_SCRIPT_CAUCASIAN_ALBANIAN          = HB_TAG ('A','g','h','b'),
 309   /*7.0*/ HB_SCRIPT_DUPLOYAN                    = HB_TAG ('D','u','p','l'),
 310   /*7.0*/ HB_SCRIPT_ELBASAN                     = HB_TAG ('E','l','b','a'),
 311   /*7.0*/ HB_SCRIPT_GRANTHA                     = HB_TAG ('G','r','a','n'),
 312   /*7.0*/ HB_SCRIPT_KHOJKI                      = HB_TAG ('K','h','o','j'),
 313   /*7.0*/ HB_SCRIPT_KHUDAWADI                   = HB_TAG ('S','i','n','d'),
 314   /*7.0*/ HB_SCRIPT_LINEAR_A                    = HB_TAG ('L','i','n','a'),
 315   /*7.0*/ HB_SCRIPT_MAHAJANI                    = HB_TAG ('M','a','h','j'),
 316   /*7.0*/ HB_SCRIPT_MANICHAEAN                  = HB_TAG ('M','a','n','i'),
 317   /*7.0*/ HB_SCRIPT_MENDE_KIKAKUI               = HB_TAG ('M','e','n','d'),
 318   /*7.0*/ HB_SCRIPT_MODI                        = HB_TAG ('M','o','d','i'),
 319   /*7.0*/ HB_SCRIPT_MRO                         = HB_TAG ('M','r','o','o'),
 320   /*7.0*/ HB_SCRIPT_NABATAEAN                   = HB_TAG ('N','b','a','t'),
 321   /*7.0*/ HB_SCRIPT_OLD_NORTH_ARABIAN           = HB_TAG ('N','a','r','b'),
 322   /*7.0*/ HB_SCRIPT_OLD_PERMIC                  = HB_TAG ('P','e','r','m'),
 323   /*7.0*/ HB_SCRIPT_PAHAWH_HMONG                = HB_TAG ('H','m','n','g'),
 324   /*7.0*/ HB_SCRIPT_PALMYRENE                   = HB_TAG ('P','a','l','m'),
 325   /*7.0*/ HB_SCRIPT_PAU_CIN_HAU                 = HB_TAG ('P','a','u','c'),
 326   /*7.0*/ HB_SCRIPT_PSALTER_PAHLAVI             = HB_TAG ('P','h','l','p'),
 327   /*7.0*/ HB_SCRIPT_SIDDHAM                     = HB_TAG ('S','i','d','d'),
 328   /*7.0*/ HB_SCRIPT_TIRHUTA                     = HB_TAG ('T','i','r','h'),
 329   /*7.0*/ HB_SCRIPT_WARANG_CITI                 = HB_TAG ('W','a','r','a'),
 330 
 331   /*8.0*/ HB_SCRIPT_AHOM                        = HB_TAG ('A','h','o','m'),
 332   /*8.0*/ HB_SCRIPT_ANATOLIAN_HIEROGLYPHS       = HB_TAG ('H','l','u','w'),
 333   /*8.0*/ HB_SCRIPT_HATRAN                      = HB_TAG ('H','a','t','r'),
 334   /*8.0*/ HB_SCRIPT_MULTANI                     = HB_TAG ('M','u','l','t'),
 335   /*8.0*/ HB_SCRIPT_OLD_HUNGARIAN               = HB_TAG ('H','u','n','g'),
 336   /*8.0*/ HB_SCRIPT_SIGNWRITING                 = HB_TAG ('S','g','n','w'),
 337 
 338   /* No script set. */
 339   HB_SCRIPT_INVALID                             = HB_TAG_NONE,
 340 
 341   /* Dummy values to ensure any hb_tag_t value can be passed/stored as hb_script_t
 342    * without risking undefined behavior.  Include both a signed and unsigned max,
 343    * since technically enums are int, and indeed, hb_script_t ends up being signed.
 344    * See this thread for technicalities:
 345    *
 346    *   http://lists.freedesktop.org/archives/harfbuzz/2014-March/004150.html
 347    */
 348   _HB_SCRIPT_MAX_VALUE                          = HB_TAG_MAX, /*< skip >*/
 349   _HB_SCRIPT_MAX_VALUE_SIGNED                   = HB_TAG_MAX_SIGNED /*< skip >*/
 350 
 351 } hb_script_t;
 352 
 353 
 354 /* Script functions */
 355 
 356 hb_script_t
 357 hb_script_from_iso15924_tag (hb_tag_t tag);
 358 
 359 /* sugar for tag_from_string() then script_from_iso15924_tag */
 360 /* len=-1 means s is NUL-terminated */
 361 hb_script_t
 362 hb_script_from_string (const char *s, int len);
 363 
 364 hb_tag_t
 365 hb_script_to_iso15924_tag (hb_script_t script);
 366 
 367 hb_direction_t
 368 hb_script_get_horizontal_direction (hb_script_t script);
 369 
 370 
 371 /* User data */
 372 
 373 typedef struct hb_user_data_key_t {
 374   /*< private >*/
 375   char unused;
 376 } hb_user_data_key_t;
 377 
 378 typedef void (*hb_destroy_func_t) (void *user_data);
 379 
 380 
 381 HB_END_DECLS
 382 
 383 #endif /* HB_COMMON_H */