1 /*
2  * Copyright © 2018  Ebrahim Byagowi
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 
25 #ifndef HB_AAT_LTAG_TABLE_HH
26 #define HB_AAT_LTAG_TABLE_HH
27 
28 #include "hb-open-type.hh"
29 
30 /*
31  * ltag -- Language Tag
32  * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ltag.html
33  */
34 #define HB_AAT_TAG_ltag HB_TAG('l','t','a','g')
35 
36 
37 namespace AAT {
38 
39 using namespace OT;
40 
41 
42 struct FTStringRange
43 {
44   friend struct ltag;
45 
sanitizeAAT::FTStringRange46   bool sanitize (hb_sanitize_context_t *c, const void *base) const
47   {
48     TRACE_SANITIZE (this);
49     return_trace (c->check_struct (this) && (base+tag).sanitize (c, length));
50   }
51 
52   protected:
53   OffsetTo<UnsizedArrayOf<HBUINT8>, HBUINT16, false>
54 		tag;		/* Offset from the start of the table to
55 				 * the beginning of the string */
56   HBUINT16	length;		/* String length (in bytes) */
57   public:
58   DEFINE_SIZE_STATIC (4);
59 };
60 
61 struct ltag
62 {
63   enum { tableTag = HB_AAT_TAG_ltag };
64 
get_languageAAT::ltag65   hb_language_t get_language (unsigned int i) const
66   {
67     const FTStringRange &range = tagRanges[i];
68     return hb_language_from_string ((const char *) (this+range.tag).arrayZ,
69 				    range.length);
70   }
71 
sanitizeAAT::ltag72   bool sanitize (hb_sanitize_context_t *c) const
73   {
74     TRACE_SANITIZE (this);
75     return_trace (likely (c->check_struct (this) &&
76 			  version >= 1 &&
77 			  tagRanges.sanitize (c, this)));
78   }
79 
80   protected:
81   HBUINT32	version;	/* Table version; currently 1 */
82   HBUINT32	flags;		/* Table flags; currently none defined */
83   LArrayOf<FTStringRange>
84 		tagRanges;	/* Range for each tag's string */
85   public:
86   DEFINE_SIZE_ARRAY (12, tagRanges);
87 };
88 
89 } /* namespace AAT */
90 
91 
92 #endif /* HB_AAT_LTAG_TABLE_HH */
93