thirdparty/freetype-2.3.12/src/otvalid/otvmod.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  otvmod.c                                                               */
   4 /*                                                                         */
   5 /*    FreeType's OpenType validation module implementation (body).         */
   6 /*                                                                         */
   7 /*  Copyright 2004, 2005, 2006, 2007, 2008 by                              */
   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 #include <ft2build.h>
  20 #include FT_TRUETYPE_TABLES_H
  21 #include FT_TRUETYPE_TAGS_H
  22 #include FT_OPENTYPE_VALIDATE_H
  23 #include FT_INTERNAL_OBJECTS_H
  24 #include FT_SERVICE_OPENTYPE_VALIDATE_H
  25
  26 #include "otvmod.h"
  27 #include "otvalid.h"
  28 #include "otvcommn.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_otvmodule
  39
  40
  41   static FT_Error
  42   otv_load_table( FT_Face             face,
  43                   FT_Tag              tag,
  44                   FT_Byte* volatile*  table,
  45                   FT_ULong*           table_len )
  46   {
  47     FT_Error   error;
  48     FT_Memory  memory = FT_FACE_MEMORY( face );
  49
  50
  51     error = FT_Load_Sfnt_Table( face, tag, 0, NULL, table_len );
  52     if ( error == OTV_Err_Table_Missing )
  53       return OTV_Err_Ok;
  54     if ( error )
  55       goto Exit;
  56
  57     if ( FT_ALLOC( *table, *table_len ) )
  58       goto Exit;
  59
  60     error = FT_Load_Sfnt_Table( face, tag, 0, *table, table_len );
  61
  62   Exit:
  63     return error;
  64   }
  65
  66
  67   static FT_Error
  68   otv_validate( FT_Face volatile   face,
  69                 FT_UInt            ot_flags,
  70                 FT_Bytes          *ot_base,
  71                 FT_Bytes          *ot_gdef,
  72                 FT_Bytes          *ot_gpos,
  73                 FT_Bytes          *ot_gsub,
  74                 FT_Bytes          *ot_jstf )
  75   {
  76     FT_Error                  error = OTV_Err_Ok;
  77     FT_Byte* volatile         base;
  78     FT_Byte* volatile         gdef;
  79     FT_Byte* volatile         gpos;
  80     FT_Byte* volatile         gsub;
  81     FT_Byte* volatile         jstf;
  82     FT_Byte* volatile         math;
  83     FT_ULong                  len_base, len_gdef, len_gpos, len_gsub, len_jstf;
  84     FT_ULong                  len_math;
  85     FT_UInt                   num_glyphs = (FT_UInt)face->num_glyphs;
  86     FT_ValidatorRec volatile  valid;
  87
  88
  89     base     = gdef     = gpos     = gsub     = jstf     = math     = NULL;
  90     len_base = len_gdef = len_gpos = len_gsub = len_jstf = len_math = 0;
  91
  92     /*
  93      * XXX: OpenType tables cannot handle 32-bit glyph index,
  94      *      although broken TrueType can have 32-bit glyph index.
  95      */
  96     if ( face->num_glyphs > 0xFFFFL )
  97     {
  98       FT_TRACE1(( "otv_validate: Invalid glyphs index (0x0000FFFF - 0x%08x) ",
  99                   face->num_glyphs ));
 100       FT_TRACE1(( "are not handled by OpenType tables\n" ));
 101       num_glyphs = 0xFFFF;
 102     }
 103
 104     /* load tables */
 105
 106     if ( ot_flags & FT_VALIDATE_BASE )
 107     {
 108       error = otv_load_table( face, TTAG_BASE, &base, &len_base );
 109       if ( error )
 110         goto Exit;
 111     }
 112
 113     if ( ot_flags & FT_VALIDATE_GDEF )
 114     {
 115       error = otv_load_table( face, TTAG_GDEF, &gdef, &len_gdef );
 116       if ( error )
 117         goto Exit;
 118     }
 119
 120     if ( ot_flags & FT_VALIDATE_GPOS )
 121     {
 122       error = otv_load_table( face, TTAG_GPOS, &gpos, &len_gpos );
 123       if ( error )
 124         goto Exit;
 125     }
 126
 127     if ( ot_flags & FT_VALIDATE_GSUB )
 128     {
 129       error = otv_load_table( face, TTAG_GSUB, &gsub, &len_gsub );
 130       if ( error )
 131         goto Exit;
 132     }
 133
 134     if ( ot_flags & FT_VALIDATE_JSTF )
 135     {
 136       error = otv_load_table( face, TTAG_JSTF, &jstf, &len_jstf );
 137       if ( error )
 138         goto Exit;
 139     }
 140
 141     if ( ot_flags & FT_VALIDATE_MATH )
 142     {
 143       error = otv_load_table( face, TTAG_MATH, &math, &len_math );
 144       if ( error )
 145         goto Exit;
 146     }
 147
 148     /* validate tables */
 149
 150     if ( base )
 151     {
 152       ft_validator_init( &valid, base, base + len_base, FT_VALIDATE_DEFAULT );
 153       if ( ft_setjmp( valid.jump_buffer ) == 0 )
 154         otv_BASE_validate( base, &valid );
 155       error = valid.error;
 156       if ( error )
 157         goto Exit;
 158     }
 159
 160     if ( gpos )
 161     {
 162       ft_validator_init( &valid, gpos, gpos + len_gpos, FT_VALIDATE_DEFAULT );
 163       if ( ft_setjmp( valid.jump_buffer ) == 0 )
 164         otv_GPOS_validate( gpos, num_glyphs, &valid );
 165       error = valid.error;
 166       if ( error )
 167         goto Exit;
 168     }
 169
 170     if ( gsub )
 171     {
 172       ft_validator_init( &valid, gsub, gsub + len_gsub, FT_VALIDATE_DEFAULT );
 173       if ( ft_setjmp( valid.jump_buffer ) == 0 )
 174         otv_GSUB_validate( gsub, num_glyphs, &valid );
 175       error = valid.error;
 176       if ( error )
 177         goto Exit;
 178     }
 179
 180     if ( gdef )
 181     {
 182       ft_validator_init( &valid, gdef, gdef + len_gdef, FT_VALIDATE_DEFAULT );
 183       if ( ft_setjmp( valid.jump_buffer ) == 0 )
 184         otv_GDEF_validate( gdef, gsub, gpos, num_glyphs, &valid );
 185       error = valid.error;
 186       if ( error )
 187         goto Exit;
 188     }
 189
 190     if ( jstf )
 191     {
 192       ft_validator_init( &valid, jstf, jstf + len_jstf, FT_VALIDATE_DEFAULT );
 193       if ( ft_setjmp( valid.jump_buffer ) == 0 )
 194         otv_JSTF_validate( jstf, gsub, gpos, num_glyphs, &valid );
 195       error = valid.error;
 196       if ( error )
 197         goto Exit;
 198     }
 199
 200     if ( math )
 201     {
 202       ft_validator_init( &valid, math, math + len_math, FT_VALIDATE_DEFAULT );
 203       if ( ft_setjmp( valid.jump_buffer ) == 0 )
 204         otv_MATH_validate( math, num_glyphs, &valid );
 205       error = valid.error;
 206       if ( error )
 207         goto Exit;
 208     }
 209
 210     *ot_base = (FT_Bytes)base;
 211     *ot_gdef = (FT_Bytes)gdef;
 212     *ot_gpos = (FT_Bytes)gpos;
 213     *ot_gsub = (FT_Bytes)gsub;
 214     *ot_jstf = (FT_Bytes)jstf;
 215
 216   Exit:
 217     if ( error ) {
 218       FT_Memory  memory = FT_FACE_MEMORY( face );
 219
 220
 221       FT_FREE( base );
 222       FT_FREE( gdef );
 223       FT_FREE( gpos );
 224       FT_FREE( gsub );
 225       FT_FREE( jstf );
 226     }
 227     {
 228       FT_Memory  memory = FT_FACE_MEMORY( face );
 229
 230
 231       FT_FREE( math );                 /* Can't return this as API is frozen */
 232     }
 233
 234     return error;
 235   }
 236
 237
 238   static
 239   const FT_Service_OTvalidateRec  otvalid_interface =
 240   {
 241     otv_validate
 242   };
 243
 244
 245   static
 246   const FT_ServiceDescRec  otvalid_services[] =
 247   {
 248     { FT_SERVICE_ID_OPENTYPE_VALIDATE, &otvalid_interface },
 249     { NULL, NULL }
 250   };
 251
 252
 253   static FT_Pointer
 254   otvalid_get_service( FT_Module    module,
 255                        const char*  service_id )
 256   {
 257     FT_UNUSED( module );
 258
 259     return ft_service_list_lookup( otvalid_services, service_id );
 260   }
 261
 262
 263   FT_CALLBACK_TABLE_DEF
 264   const FT_Module_Class  otv_module_class =
 265   {
 266     0,
 267     sizeof( FT_ModuleRec ),
 268     "otvalid",
 269     0x10000L,
 270     0x20000L,
 271
 272     0,              /* module-specific interface */
 273
 274     (FT_Module_Constructor)0,
 275     (FT_Module_Destructor) 0,
 276     (FT_Module_Requester)  otvalid_get_service
 277   };
 278
 279
 280 /* END */