aboutsummaryrefslogtreecommitdiff
path: root/freetype/src/gxvalid/gxvlcar.c
blob: f14fa5b1313770304ff26ffd76fd5be37e2cd381 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
/***************************************************************************/
/*                                                                         */
/*  gxvlcar.c                                                              */
/*                                                                         */
/*    TrueTypeGX/AAT lcar table validation (body).                         */
/*                                                                         */
/*  Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/

/***************************************************************************/
/*                                                                         */
/* gxvalid is derived from both gxlayout module and otvalid module.        */
/* Development of gxlayout is supported by the Information-technology      */
/* Promotion Agency(IPA), Japan.                                           */
/*                                                                         */
/***************************************************************************/


#include "gxvalid.h"
#include "gxvcommn.h"


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_gxvlcar


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                      Data and Types                           *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef struct  GXV_lcar_DataRec_
  {
    FT_UShort  format;

  } GXV_lcar_DataRec, *GXV_lcar_Data;


#define GXV_LCAR_DATA( FIELD )  GXV_TABLE_DATA( lcar, FIELD )


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                      UTILITY FUNCTIONS                        *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  static void
  gxv_lcar_partial_validate( FT_UShort      partial,
                             FT_UShort      glyph,
                             GXV_Validator  valid )
  {
    GXV_NAME_ENTER( "partial" );

    if ( GXV_LCAR_DATA( format ) != 1 )
      goto Exit;

    gxv_ctlPoint_validate( glyph, partial, valid );

  Exit:
    GXV_EXIT;
  }


  static void
  gxv_lcar_LookupValue_validate( FT_UShort            glyph,
                                 GXV_LookupValueCPtr  value_p,
                                 GXV_Validator        valid )
  {
    FT_Bytes   p     = valid->root->base + value_p->u;
    FT_Bytes   limit = valid->root->limit;
    FT_UShort  count;
    FT_Short   partial;
    FT_UShort  i;


    GXV_NAME_ENTER( "element in lookupTable" );

    GXV_LIMIT_CHECK( 2 );
    count = FT_NEXT_USHORT( p );

    GXV_LIMIT_CHECK( 2 * count );
    for ( i = 0; i < count; i++ )
    {
      partial = FT_NEXT_SHORT( p );
      gxv_lcar_partial_validate( partial, glyph, valid );
    }

    GXV_EXIT;
  }


  /*
    +------ lcar --------------------+
    |                                |
    |      +===============+         |
    |      | looup header  |         |
    |      +===============+         |
    |      | BinSrchHeader |         |
    |      +===============+         |
    |      | lastGlyph[0]  |         |
    |      +---------------+         |
    |      | firstGlyph[0] |         |  head of lcar sfnt table
    |      +---------------+         |             +
    |      | offset[0]     |    ->   |          offset            [byte]
    |      +===============+         |             +
    |      | lastGlyph[1]  |         | (glyphID - firstGlyph) * 2 [byte]
    |      +---------------+         |
    |      | firstGlyph[1] |         |
    |      +---------------+         |
    |      | offset[1]     |         |
    |      +===============+         |
    |                                |
    |       ....                     |
    |                                |
    |      16bit value array         |
    |      +===============+         |
    +------|     value     | <-------+
    |       ....
    |
    |
    |
    |
    |
    +---->  lcar values...handled by lcar callback function
  */

  static GXV_LookupValueDesc
  gxv_lcar_LookupFmt4_transit( FT_UShort            relative_gindex,
                               GXV_LookupValueCPtr  base_value_p,
                               FT_Bytes             lookuptbl_limit,
                               GXV_Validator        valid )
  {
    FT_Bytes             p;
    FT_Bytes             limit;
    FT_UShort            offset;
    GXV_LookupValueDesc  value;

    FT_UNUSED( lookuptbl_limit );

    /* XXX: check range? */
    offset = (FT_UShort)( base_value_p->u +
                          relative_gindex * sizeof ( FT_UShort ) );
    p      = valid->root->base + offset;
    limit  = valid->root->limit;

    GXV_LIMIT_CHECK ( 2 );
    value.u = FT_NEXT_USHORT( p );

    return value;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                          lcar TABLE                           *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL_DEF( void )
  gxv_lcar_validate( FT_Bytes      table,
                     FT_Face       face,
                     FT_Validator  ftvalid )
  {
    FT_Bytes          p     = table;
    FT_Bytes          limit = 0;
    GXV_ValidatorRec  validrec;
    GXV_Validator     valid = &validrec;

    GXV_lcar_DataRec  lcarrec;
    GXV_lcar_Data     lcar = &lcarrec;

    FT_Fixed          version;


    valid->root       = ftvalid;
    valid->table_data = lcar;
    valid->face       = face;

    FT_TRACE3(( "validating `lcar' table\n" ));
    GXV_INIT;

    GXV_LIMIT_CHECK( 4 + 2 );
    version = FT_NEXT_ULONG( p );
    GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p );

    if ( version != 0x00010000UL)
      FT_INVALID_FORMAT;

    if ( GXV_LCAR_DATA( format ) > 1 )
      FT_INVALID_FORMAT;

    valid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;
    valid->lookupval_func   = gxv_lcar_LookupValue_validate;
    valid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit;
    gxv_LookupTable_validate( p, limit, valid );

    FT_TRACE4(( "\n" ));
  }


/* END */