third_party/harfbuzz-ng/src/hb-ot-name-table.hh

   1 /*
   2  * Copyright © 2011,2012  Google, 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  * Google Author(s): Behdad Esfahbod
  25  */
  26
  27 #ifndef HB_OT_NAME_TABLE_HH
  28 #define HB_OT_NAME_TABLE_HH
  29
  30 #include "hb-open-type-private.hh"
  31
  32
  33 namespace OT {
  34
  35
  36 /*
  37  * name -- The Naming Table
  38  */
  39
  40 #define HB_OT_TAG_name HB_TAG('n','a','m','e')
  41
  42
  43 struct NameRecord
  44 {
  45   static int cmp (const NameRecord *a, const NameRecord *b)
  46   {
  47     int ret;
  48     ret = b->platformID.cmp (a->platformID);
  49     if (ret) return ret;
  50     ret = b->encodingID.cmp (a->encodingID);
  51     if (ret) return ret;
  52     ret = b->languageID.cmp (a->languageID);
  53     if (ret) return ret;
  54     ret = b->nameID.cmp (a->nameID);
  55     if (ret) return ret;
  56     return 0;
  57   }
  58
  59   inline bool sanitize (hb_sanitize_context_t *c, void *base) {
  60     TRACE_SANITIZE (this);
  61     /* We can check from base all the way up to the end of string... */
  62     return TRACE_RETURN (c->check_struct (this) && c->check_range ((char *) base, (unsigned int) length + offset));
  63   }
  64
  65   USHORT        platformID;     /* Platform ID. */
  66   USHORT        encodingID;     /* Platform-specific encoding ID. */
  67   USHORT        languageID;     /* Language ID. */
  68   USHORT        nameID;         /* Name ID. */
  69   USHORT        length;         /* String length (in bytes). */
  70   USHORT        offset;         /* String offset from start of storage area (in bytes). */
  71   public:
  72   DEFINE_SIZE_STATIC (12);
  73 };
  74
  75 struct name
  76 {
  77   static const hb_tag_t tableTag        = HB_OT_TAG_name;
  78
  79   inline unsigned int get_name (unsigned int platform_id,
  80                                 unsigned int encoding_id,
  81                                 unsigned int language_id,
  82                                 unsigned int name_id,
  83                                 void *buffer,
  84                                 unsigned int buffer_length) const
  85   {
  86     NameRecord key;
  87     key.platformID.set (platform_id);
  88     key.encodingID.set (encoding_id);
  89     key.languageID.set (language_id);
  90     key.nameID.set (name_id);
  91     NameRecord *match = (NameRecord *) bsearch (&key, nameRecord, count, sizeof (nameRecord[0]), (hb_compare_func_t) NameRecord::cmp);
  92
  93     if (!match)
  94       return 0;
  95
  96     unsigned int length = MIN (buffer_length, (unsigned int) match->length);
  97     memcpy (buffer, (char *) this + stringOffset + match->offset, length);
  98     return length;
  99   }
 100
 101   inline unsigned int get_size (void) const
 102   { return min_size + count * nameRecord[0].min_size; }
 103
 104   inline bool sanitize_records (hb_sanitize_context_t *c) {
 105     TRACE_SANITIZE (this);
 106     char *string_pool = (char *) this + stringOffset;
 107     unsigned int _count = count;
 108     for (unsigned int i = 0; i < _count; i++)
 109       if (!nameRecord[i].sanitize (c, string_pool)) return TRACE_RETURN (false);
 110     return TRACE_RETURN (true);
 111   }
 112
 113   inline bool sanitize (hb_sanitize_context_t *c) {
 114     TRACE_SANITIZE (this);
 115     return TRACE_RETURN (c->check_struct (this) &&
 116                          likely (format == 0 || format == 1) &&
 117                          c->check_array (nameRecord, nameRecord[0].static_size, count) &&
 118                          sanitize_records (c));
 119   }
 120
 121   /* We only implement format 0 for now. */
 122   USHORT        format;                 /* Format selector (=0/1). */
 123   USHORT        count;                  /* Number of name records. */
 124   Offset<>      stringOffset;           /* Offset to start of string storage (from start of table). */
 125   NameRecord    nameRecord[VAR];        /* The name records where count is the number of records. */
 126   public:
 127   DEFINE_SIZE_ARRAY (6, nameRecord);
 128 };
 129
 130
 131 } /* namespace OT */
 132
 133
 134 #endif /* HB_OT_NAME_TABLE_HH */