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Viewing changes to tests/freetype/src/gxvalid/gxvlcar.c

  • Committer: Package Import Robot
  • Author(s): Sylvestre Ledru
  • Date: 2013-05-02 13:11:51 UTC
  • Revision ID: package-import@ubuntu.com-20130502131151-q8dvteqr1ef2x7xz
Tags: upstream-1.4.1~20130504~adb56cb
Import upstream version 1.4.1~20130504~adb56cb

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tests/freetype/src/gxvalid/gxvlcar.c
 
1
/***************************************************************************/
 
2
/*                                                                         */
 
3
/*  gxvlcar.c                                                              */
 
4
/*                                                                         */
 
5
/*    TrueTypeGX/AAT lcar table validation (body).                         */
 
6
/*                                                                         */
 
7
/*  Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
 
8
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
 
9
/*                                                                         */
 
10
/*  This file is part of the FreeType project, and may only be used,       */
 
11
/*  modified, and distributed under the terms of the FreeType project      */
 
12
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
 
13
/*  this file you indicate that you have read the license and              */
 
14
/*  understand and accept it fully.                                        */
 
15
/*                                                                         */
 
16
/***************************************************************************/
 
17
 
 
18
/***************************************************************************/
 
19
/*                                                                         */
 
20
/* gxvalid is derived from both gxlayout module and otvalid module.        */
 
21
/* Development of gxlayout is supported by the Information-technology      */
 
22
/* Promotion Agency(IPA), Japan.                                           */
 
23
/*                                                                         */
 
24
/***************************************************************************/
 
25
 
 
26
 
 
27
#include "gxvalid.h"
 
28
#include "gxvcommn.h"
 
29
 
 
30
 
 
31
  /*************************************************************************/
 
32
  /*                                                                       */
 
33
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
 
34
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
 
35
  /* messages during execution.                                            */
 
36
  /*                                                                       */
 
37
#undef  FT_COMPONENT
 
38
#define FT_COMPONENT  trace_gxvlcar
 
39
 
 
40
 
 
41
  /*************************************************************************/
 
42
  /*************************************************************************/
 
43
  /*****                                                               *****/
 
44
  /*****                      Data and Types                           *****/
 
45
  /*****                                                               *****/
 
46
  /*************************************************************************/
 
47
  /*************************************************************************/
 
48
 
 
49
  typedef struct  GXV_lcar_DataRec_
 
50
  {
 
51
    FT_UShort  format;
 
52
 
 
53
  } GXV_lcar_DataRec, *GXV_lcar_Data;
 
54
 
 
55
 
 
56
#define GXV_LCAR_DATA( FIELD )  GXV_TABLE_DATA( lcar, FIELD )
 
57
 
 
58
 
 
59
  /*************************************************************************/
 
60
  /*************************************************************************/
 
61
  /*****                                                               *****/
 
62
  /*****                      UTILITY FUNCTIONS                        *****/
 
63
  /*****                                                               *****/
 
64
  /*************************************************************************/
 
65
  /*************************************************************************/
 
66
 
 
67
  static void
 
68
  gxv_lcar_partial_validate( FT_UShort      partial,
 
69
                             FT_UShort      glyph,
 
70
                             GXV_Validator  valid )
 
71
  {
 
72
    GXV_NAME_ENTER( "partial" );
 
73
 
 
74
    if ( GXV_LCAR_DATA( format ) != 1 )
 
75
      goto Exit;
 
76
 
 
77
    gxv_ctlPoint_validate( glyph, partial, valid );
 
78
 
 
79
  Exit:
 
80
    GXV_EXIT;
 
81
  }
 
82
 
 
83
 
 
84
  static void
 
85
  gxv_lcar_LookupValue_validate( FT_UShort            glyph,
 
86
                                 GXV_LookupValueCPtr  value_p,
 
87
                                 GXV_Validator        valid )
 
88
  {
 
89
    FT_Bytes   p     = valid->root->base + value_p->u;
 
90
    FT_Bytes   limit = valid->root->limit;
 
91
    FT_UShort  count;
 
92
    FT_Short   partial;
 
93
    FT_UShort  i;
 
94
 
 
95
 
 
96
    GXV_NAME_ENTER( "element in lookupTable" );
 
97
 
 
98
    GXV_LIMIT_CHECK( 2 );
 
99
    count = FT_NEXT_USHORT( p );
 
100
 
 
101
    GXV_LIMIT_CHECK( 2 * count );
 
102
    for ( i = 0; i < count; i++ )
 
103
    {
 
104
      partial = FT_NEXT_SHORT( p );
 
105
      gxv_lcar_partial_validate( partial, glyph, valid );
 
106
    }
 
107
 
 
108
    GXV_EXIT;
 
109
  }
 
110
 
 
111
 
 
112
  /*
 
113
    +------ lcar --------------------+
 
114
    |                                |
 
115
    |      +===============+         |
 
116
    |      | looup header  |         |
 
117
    |      +===============+         |
 
118
    |      | BinSrchHeader |         |
 
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    |      +===============+         |
 
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    |      | lastGlyph[0]  |         |
 
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    |      +---------------+         |
 
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    |      | firstGlyph[0] |         |  head of lcar sfnt table
 
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    |      +---------------+         |             +
 
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    |      | offset[0]     |    ->   |          offset            [byte]
 
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    |      +===============+         |             +
 
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    |      | lastGlyph[1]  |         | (glyphID - firstGlyph) * 2 [byte]
 
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    |      +---------------+         |
 
128
    |      | firstGlyph[1] |         |
 
129
    |      +---------------+         |
 
130
    |      | offset[1]     |         |
 
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    |      +===============+         |
 
132
    |                                |
 
133
    |       ....                     |
 
134
    |                                |
 
135
    |      16bit value array         |
 
136
    |      +===============+         |
 
137
    +------|     value     | <-------+
 
138
    |       ....
 
139
    |
 
140
    |
 
141
    |
 
142
    |
 
143
    |
 
144
    +---->  lcar values...handled by lcar callback function
 
145
  */
 
146
 
 
147
  static GXV_LookupValueDesc
 
148
  gxv_lcar_LookupFmt4_transit( FT_UShort            relative_gindex,
 
149
                               GXV_LookupValueCPtr  base_value_p,
 
150
                               FT_Bytes             lookuptbl_limit,
 
151
                               GXV_Validator        valid )
 
152
  {
 
153
    FT_Bytes             p;
 
154
    FT_Bytes             limit;
 
155
    FT_UShort            offset;
 
156
    GXV_LookupValueDesc  value;
 
157
 
 
158
    FT_UNUSED( lookuptbl_limit );
 
159
 
 
160
    /* XXX: check range? */
 
161
    offset = (FT_UShort)( base_value_p->u +
 
162
                          relative_gindex * sizeof ( FT_UShort ) );
 
163
    p      = valid->root->base + offset;
 
164
    limit  = valid->root->limit;
 
165
 
 
166
    GXV_LIMIT_CHECK ( 2 );
 
167
    value.u = FT_NEXT_USHORT( p );
 
168
 
 
169
    return value;
 
170
  }
 
171
 
 
172
 
 
173
  /*************************************************************************/
 
174
  /*************************************************************************/
 
175
  /*****                                                               *****/
 
176
  /*****                          lcar TABLE                           *****/
 
177
  /*****                                                               *****/
 
178
  /*************************************************************************/
 
179
  /*************************************************************************/
 
180
 
 
181
  FT_LOCAL_DEF( void )
 
182
  gxv_lcar_validate( FT_Bytes      table,
 
183
                     FT_Face       face,
 
184
                     FT_Validator  ftvalid )
 
185
  {
 
186
    FT_Bytes          p     = table;
 
187
    FT_Bytes          limit = 0;
 
188
    GXV_ValidatorRec  validrec;
 
189
    GXV_Validator     valid = &validrec;
 
190
 
 
191
    GXV_lcar_DataRec  lcarrec;
 
192
    GXV_lcar_Data     lcar = &lcarrec;
 
193
 
 
194
    FT_Fixed          version;
 
195
 
 
196
 
 
197
    valid->root       = ftvalid;
 
198
    valid->table_data = lcar;
 
199
    valid->face       = face;
 
200
 
 
201
    FT_TRACE3(( "validating `lcar' table\n" ));
 
202
    GXV_INIT;
 
203
 
 
204
    GXV_LIMIT_CHECK( 4 + 2 );
 
205
    version = FT_NEXT_ULONG( p );
 
206
    GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p );
 
207
 
 
208
    if ( version != 0x00010000UL)
 
209
      FT_INVALID_FORMAT;
 
210
 
 
211
    if ( GXV_LCAR_DATA( format ) > 1 )
 
212
      FT_INVALID_FORMAT;
 
213
 
 
214
    valid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;
 
215
    valid->lookupval_func   = gxv_lcar_LookupValue_validate;
 
216
    valid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit;
 
217
    gxv_LookupTable_validate( p, limit, valid );
 
218
 
 
219
    FT_TRACE4(( "\n" ));
 
220
  }
 
221
 
 
222
 
 
223
/* END */