thirdparty/freetype-2.3.12/src/gxvalid/gxvmod.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  gxvmod.c                                                               */
   4 /*                                                                         */
   5 /*    FreeType's TrueTypeGX/AAT validation module implementation (body).   */
   6 /*                                                                         */
   7 /*  Copyright 2004, 2005, 2006                                             */
   8 /*  by suzuki toshiya, Masatake YAMATO, Red Hat K.K.,                      */
   9 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  10 /*                                                                         */
  11 /*  This file is part of the FreeType project, and may only be used,       */
  12 /*  modified, and distributed under the terms of the FreeType project      */
  13 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  14 /*  this file you indicate that you have read the license and              */
  15 /*  understand and accept it fully.                                        */
  16 /*                                                                         */
  17 /***************************************************************************/
  18
  19 /***************************************************************************/
  20 /*                                                                         */
  21 /* gxvalid is derived from both gxlayout module and otvalid module.        */
  22 /* Development of gxlayout is supported by the Information-technology      */
  23 /* Promotion Agency(IPA), Japan.                                           */
  24 /*                                                                         */
  25 /***************************************************************************/
  26
  27
  28 #include <ft2build.h>
  29 #include FT_TRUETYPE_TABLES_H
  30 #include FT_TRUETYPE_TAGS_H
  31 #include FT_GX_VALIDATE_H
  32 #include FT_INTERNAL_OBJECTS_H
  33 #include FT_SERVICE_GX_VALIDATE_H
  34
  35 #include "gxvmod.h"
  36 #include "gxvalid.h"
  37 #include "gxvcommn.h"
  38
  39
  40   /*************************************************************************/
  41   /*                                                                       */
  42   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  43   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  44   /* messages during execution.                                            */
  45   /*                                                                       */
  46 #undef  FT_COMPONENT
  47 #define FT_COMPONENT  trace_gxvmodule
  48
  49
  50   static FT_Error
  51   gxv_load_table( FT_Face             face,
  52                   FT_Tag              tag,
  53                   FT_Byte* volatile*  table,
  54                   FT_ULong*           table_len )
  55   {
  56     FT_Error   error;
  57     FT_Memory  memory = FT_FACE_MEMORY( face );
  58
  59
  60     error = FT_Load_Sfnt_Table( face, tag, 0, NULL, table_len );
  61     if ( error == GXV_Err_Table_Missing )
  62       return GXV_Err_Ok;
  63     if ( error )
  64       goto Exit;
  65
  66     if ( FT_ALLOC( *table, *table_len ) )
  67       goto Exit;
  68
  69     error = FT_Load_Sfnt_Table( face, tag, 0, *table, table_len );
  70
  71   Exit:
  72     return error;
  73   }
  74
  75
  76 #define GXV_TABLE_DECL( _sfnt )                     \
  77           FT_Byte* volatile  _sfnt          = NULL; \
  78           FT_ULong            len_ ## _sfnt = 0
  79
  80 #define GXV_TABLE_LOAD( _sfnt )                                     \
  81           if ( ( FT_VALIDATE_ ## _sfnt ## _INDEX < table_count ) && \
  82                ( gx_flags & FT_VALIDATE_ ## _sfnt )            )    \
  83           {                                                         \
  84             error = gxv_load_table( face, TTAG_ ## _sfnt,           \
  85                                     &_sfnt, &len_ ## _sfnt );       \
  86             if ( error )                                            \
  87               goto Exit;                                            \
  88           }
  89
  90 #define GXV_TABLE_VALIDATE( _sfnt )                                  \
  91           if ( _sfnt )                                               \
  92           {                                                          \
  93             ft_validator_init( &valid, _sfnt, _sfnt + len_ ## _sfnt, \
  94                                FT_VALIDATE_DEFAULT );                \
  95             if ( ft_setjmp( valid.jump_buffer ) == 0 )               \
  96               gxv_ ## _sfnt ## _validate( _sfnt, face, &valid );     \
  97             error = valid.error;                                     \
  98             if ( error )                                             \
  99               goto Exit;                                             \
 100           }
 101
 102 #define GXV_TABLE_SET( _sfnt )                                        \
 103           if ( FT_VALIDATE_ ## _sfnt ## _INDEX < table_count )        \
 104             tables[FT_VALIDATE_ ## _sfnt ## _INDEX] = (FT_Bytes)_sfnt
 105
 106
 107   static FT_Error
 108   gxv_validate( FT_Face   face,
 109                 FT_UInt   gx_flags,
 110                 FT_Bytes  tables[FT_VALIDATE_GX_LENGTH],
 111                 FT_UInt   table_count )
 112   {
 113     FT_Memory volatile        memory = FT_FACE_MEMORY( face );
 114
 115     FT_Error                  error = GXV_Err_Ok;
 116     FT_ValidatorRec volatile  valid;
 117
 118     FT_UInt  i;
 119
 120
 121     GXV_TABLE_DECL( feat );
 122     GXV_TABLE_DECL( bsln );
 123     GXV_TABLE_DECL( trak );
 124     GXV_TABLE_DECL( just );
 125     GXV_TABLE_DECL( mort );
 126     GXV_TABLE_DECL( morx );
 127     GXV_TABLE_DECL( kern );
 128     GXV_TABLE_DECL( opbd );
 129     GXV_TABLE_DECL( prop );
 130     GXV_TABLE_DECL( lcar );
 131
 132     for ( i = 0; i < table_count; i++ )
 133       tables[i] = 0;
 134
 135     /* load tables */
 136     GXV_TABLE_LOAD( feat );
 137     GXV_TABLE_LOAD( bsln );
 138     GXV_TABLE_LOAD( trak );
 139     GXV_TABLE_LOAD( just );
 140     GXV_TABLE_LOAD( mort );
 141     GXV_TABLE_LOAD( morx );
 142     GXV_TABLE_LOAD( kern );
 143     GXV_TABLE_LOAD( opbd );
 144     GXV_TABLE_LOAD( prop );
 145     GXV_TABLE_LOAD( lcar );
 146
 147     /* validate tables */
 148     GXV_TABLE_VALIDATE( feat );
 149     GXV_TABLE_VALIDATE( bsln );
 150     GXV_TABLE_VALIDATE( trak );
 151     GXV_TABLE_VALIDATE( just );
 152     GXV_TABLE_VALIDATE( mort );
 153     GXV_TABLE_VALIDATE( morx );
 154     GXV_TABLE_VALIDATE( kern );
 155     GXV_TABLE_VALIDATE( opbd );
 156     GXV_TABLE_VALIDATE( prop );
 157     GXV_TABLE_VALIDATE( lcar );
 158
 159     /* Set results */
 160     GXV_TABLE_SET( feat );
 161     GXV_TABLE_SET( mort );
 162     GXV_TABLE_SET( morx );
 163     GXV_TABLE_SET( bsln );
 164     GXV_TABLE_SET( just );
 165     GXV_TABLE_SET( kern );
 166     GXV_TABLE_SET( opbd );
 167     GXV_TABLE_SET( trak );
 168     GXV_TABLE_SET( prop );
 169     GXV_TABLE_SET( lcar );
 170
 171   Exit:
 172     if ( error )
 173     {
 174       FT_FREE( feat );
 175       FT_FREE( bsln );
 176       FT_FREE( trak );
 177       FT_FREE( just );
 178       FT_FREE( mort );
 179       FT_FREE( morx );
 180       FT_FREE( kern );
 181       FT_FREE( opbd );
 182       FT_FREE( prop );
 183       FT_FREE( lcar );
 184     }
 185
 186     return error;
 187   }
 188
 189
 190   static FT_Error
 191   classic_kern_validate( FT_Face    face,
 192                          FT_UInt    ckern_flags,
 193                          FT_Bytes*  ckern_table )
 194   {
 195     FT_Memory volatile        memory = FT_FACE_MEMORY( face );
 196
 197     FT_Byte* volatile         ckern     = NULL;
 198     FT_ULong                  len_ckern = 0;
 199
 200     /* without volatile on `error' GCC 4.1.1. emits:                         */
 201     /*  warning: variable 'error' might be clobbered by 'longjmp' or 'vfork' */
 202     /* this warning seems spurious but ---                                   */
 203     FT_Error volatile         error = GXV_Err_Ok;
 204     FT_ValidatorRec volatile  valid;
 205
 206
 207     *ckern_table = NULL;
 208
 209     error = gxv_load_table( face, TTAG_kern, &ckern, &len_ckern );
 210     if ( error )
 211       goto Exit;
 212
 213     if ( ckern )
 214     {
 215       ft_validator_init( &valid, ckern, ckern + len_ckern,
 216                          FT_VALIDATE_DEFAULT );
 217       if ( ft_setjmp( valid.jump_buffer ) == 0 )
 218         gxv_kern_validate_classic( ckern, face,
 219                                    ckern_flags & FT_VALIDATE_CKERN, &valid );
 220       error = valid.error;
 221       if ( error )
 222         goto Exit;
 223     }
 224
 225     *ckern_table = ckern;
 226
 227   Exit:
 228     if ( error )
 229       FT_FREE( ckern );
 230
 231     return error;
 232   }
 233
 234
 235   static
 236   const FT_Service_GXvalidateRec  gxvalid_interface =
 237   {
 238     gxv_validate
 239   };
 240
 241
 242   static
 243   const FT_Service_CKERNvalidateRec  ckernvalid_interface =
 244   {
 245     classic_kern_validate
 246   };
 247
 248
 249   static
 250   const FT_ServiceDescRec  gxvalid_services[] =
 251   {
 252     { FT_SERVICE_ID_GX_VALIDATE,          &gxvalid_interface },
 253     { FT_SERVICE_ID_CLASSICKERN_VALIDATE, &ckernvalid_interface },
 254     { NULL, NULL }
 255   };
 256
 257
 258   static FT_Pointer
 259   gxvalid_get_service( FT_Module    module,
 260                        const char*  service_id )
 261   {
 262     FT_UNUSED( module );
 263
 264     return ft_service_list_lookup( gxvalid_services, service_id );
 265   }
 266
 267
 268   FT_CALLBACK_TABLE_DEF
 269   const FT_Module_Class  gxv_module_class =
 270   {
 271     0,
 272     sizeof( FT_ModuleRec ),
 273     "gxvalid",
 274     0x10000L,
 275     0x20000L,
 276
 277     0,              /* module-specific interface */
 278
 279     (FT_Module_Constructor)0,
 280     (FT_Module_Destructor) 0,
 281     (FT_Module_Requester)  gxvalid_get_service
 282   };
 283
 284
 285 /* END */