ReactOS Development > Doxygen

00001 /***************************************************************************/
00002 /*                                                                         */
00003 /*  gxvtrak.c                                                              */
00004 /*                                                                         */
00005 /*    TrueTypeGX/AAT trak table validation (body).                         */
00006 /*                                                                         */
00007 /*  Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
00008 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
00009 /*                                                                         */
00010 /*  This file is part of the FreeType project, and may only be used,       */
00011 /*  modified, and distributed under the terms of the FreeType project      */
00012 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
00013 /*  this file you indicate that you have read the license and              */
00014 /*  understand and accept it fully.                                        */
00015 /*                                                                         */
00016 /***************************************************************************/
00017 
00018 /***************************************************************************/
00019 /*                                                                         */
00020 /* gxvalid is derived from both gxlayout module and otvalid module.        */
00021 /* Development of gxlayout is supported by the Information-technology      */
00022 /* Promotion Agency(IPA), Japan.                                           */
00023 /*                                                                         */
00024 /***************************************************************************/
00025 
00026 
00027 #include "gxvalid.h"
00028 #include "gxvcommn.h"
00029 
00030 
00031   /*************************************************************************/
00032   /*                                                                       */
00033   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
00034   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
00035   /* messages during execution.                                            */
00036   /*                                                                       */
00037 #undef  FT_COMPONENT
00038 #define FT_COMPONENT  trace_gxvtrak
00039 
00040 
00041   /*************************************************************************/
00042   /*************************************************************************/
00043   /*****                                                               *****/
00044   /*****                      Data and Types                           *****/
00045   /*****                                                               *****/
00046   /*************************************************************************/
00047   /*************************************************************************/
00048 
00049     /*
00050      * referred track table format specification:
00051      * http://developer.apple.com/fonts/TTRefMan/RM06/Chap6trak.html
00052      * last update was 1996.
00053      * ----------------------------------------------
00054      * [MINIMUM HEADER]: GXV_TRAK_SIZE_MIN
00055      * version          (fixed:  32bit) = 0x00010000
00056      * format           (uint16: 16bit) = 0 is only defined (1996)
00057      * horizOffset      (uint16: 16bit)
00058      * vertOffset       (uint16: 16bit)
00059      * reserved         (uint16: 16bit) = 0
00060      * ----------------------------------------------
00061      * [VARIABLE BODY]:
00062      * horizData
00063      *   header         ( 2 + 2 + 4
00064      *   trackTable       + nTracks * ( 4 + 2 + 2 )
00065      *   sizeTable        + nSizes * 4 )
00066      * ----------------------------------------------
00067      * vertData
00068      *   header         ( 2 + 2 + 4
00069      *   trackTable       + nTracks * ( 4 + 2 + 2 )
00070      *   sizeTable        + nSizes * 4 )
00071      * ----------------------------------------------
00072      */
00073   typedef struct  GXV_trak_DataRec_
00074   {
00075     FT_UShort  trackValueOffset_min;
00076     FT_UShort  trackValueOffset_max;
00077 
00078   } GXV_trak_DataRec, *GXV_trak_Data;
00079 
00080 
00081 #define GXV_TRAK_DATA( FIELD )  GXV_TABLE_DATA( trak, FIELD )
00082 
00083 
00084   /*************************************************************************/
00085   /*************************************************************************/
00086   /*****                                                               *****/
00087   /*****                      UTILITY FUNCTIONS                        *****/
00088   /*****                                                               *****/
00089   /*************************************************************************/
00090   /*************************************************************************/
00091 
00092   static void
00093   gxv_trak_trackTable_validate( FT_Bytes       table,
00094                                 FT_Bytes       limit,
00095                                 FT_UShort      nTracks,
00096                                 GXV_Validator  valid )
00097   {
00098     FT_Bytes   p = table;
00099 
00100     FT_Fixed   track;
00101     FT_UShort  nameIndex;
00102     FT_UShort  offset;
00103     FT_UShort  i;
00104 
00105 
00106     GXV_NAME_ENTER( "trackTable" );
00107 
00108     GXV_TRAK_DATA( trackValueOffset_min ) = 0xFFFFU;
00109     GXV_TRAK_DATA( trackValueOffset_max ) = 0x0000;
00110 
00111     for ( i = 0; i < nTracks; i ++ )
00112     {
00113       GXV_LIMIT_CHECK( 4 + 2 + 2 );
00114       track     = FT_NEXT_LONG( p );
00115       nameIndex = FT_NEXT_USHORT( p );
00116       offset    = FT_NEXT_USHORT( p );
00117 
00118       if ( offset < GXV_TRAK_DATA( trackValueOffset_min ) )
00119         GXV_TRAK_DATA( trackValueOffset_min ) = offset;
00120       if ( offset > GXV_TRAK_DATA( trackValueOffset_max ) )
00121         GXV_TRAK_DATA( trackValueOffset_max ) = offset;
00122 
00123       gxv_sfntName_validate( nameIndex, 256, 32767, valid );
00124     }
00125 
00126     valid->subtable_length = p - table;
00127     GXV_EXIT;
00128   }
00129 
00130 
00131   static void
00132   gxv_trak_trackData_validate( FT_Bytes       table,
00133                                FT_Bytes       limit,
00134                                GXV_Validator  valid )
00135   {
00136     FT_Bytes   p = table;
00137     FT_UShort  nTracks;
00138     FT_UShort  nSizes;
00139     FT_ULong   sizeTableOffset;
00140 
00141     GXV_ODTECT( 4, odtect );
00142 
00143 
00144     GXV_ODTECT_INIT( odtect );
00145     GXV_NAME_ENTER( "trackData" );
00146 
00147     /* read the header of trackData */
00148     GXV_LIMIT_CHECK( 2 + 2 + 4 );
00149     nTracks         = FT_NEXT_USHORT( p );
00150     nSizes          = FT_NEXT_USHORT( p );
00151     sizeTableOffset = FT_NEXT_ULONG( p );
00152 
00153     gxv_odtect_add_range( table, p - table, "trackData header", odtect );
00154 
00155     /* validate trackTable */
00156     gxv_trak_trackTable_validate( p, limit, nTracks, valid );
00157     gxv_odtect_add_range( p, valid->subtable_length,
00158                           "trackTable", odtect );
00159 
00160     /* sizeTable is array of FT_Fixed, don't check contents */
00161     p = valid->root->base + sizeTableOffset;
00162     GXV_LIMIT_CHECK( nSizes * 4 );
00163     gxv_odtect_add_range( p, nSizes * 4, "sizeTable", odtect );
00164 
00165     /* validate trackValueOffet */
00166     p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_min );
00167     if ( limit - p < nTracks * nSizes * 2 )
00168       GXV_TRACE(( "too short trackValue array\n" ));
00169 
00170     p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_max );
00171     GXV_LIMIT_CHECK( nSizes * 2 );
00172 
00173     gxv_odtect_add_range( valid->root->base
00174                             + GXV_TRAK_DATA( trackValueOffset_min ),
00175                           GXV_TRAK_DATA( trackValueOffset_max )
00176                             - GXV_TRAK_DATA( trackValueOffset_min )
00177                             + nSizes * 2,
00178                           "trackValue array", odtect );
00179 
00180     gxv_odtect_validate( odtect, valid );
00181 
00182     GXV_EXIT;
00183   }
00184 
00185 
00186   /*************************************************************************/
00187   /*************************************************************************/
00188   /*****                                                               *****/
00189   /*****                          trak TABLE                           *****/
00190   /*****                                                               *****/
00191   /*************************************************************************/
00192   /*************************************************************************/
00193 
00194   FT_LOCAL_DEF( void )
00195   gxv_trak_validate( FT_Bytes      table,
00196                      FT_Face       face,
00197                      FT_Validator  ftvalid )
00198   {
00199     FT_Bytes          p = table;
00200     FT_Bytes          limit = 0;
00201     FT_Offset         table_size;
00202 
00203     GXV_ValidatorRec  validrec;
00204     GXV_Validator     valid = &validrec;
00205     GXV_trak_DataRec  trakrec;
00206     GXV_trak_Data     trak = &trakrec;
00207 
00208     FT_ULong   version;
00209     FT_UShort  format;
00210     FT_UShort  horizOffset;
00211     FT_UShort  vertOffset;
00212     FT_UShort  reserved;
00213 
00214 
00215     GXV_ODTECT( 3, odtect );
00216 
00217     GXV_ODTECT_INIT( odtect );
00218     valid->root       = ftvalid;
00219     valid->table_data = trak;
00220     valid->face       = face;
00221 
00222     limit      = valid->root->limit;
00223     table_size = limit - table;
00224 
00225     FT_TRACE3(( "validating `trak' table\n" ));
00226     GXV_INIT;
00227 
00228     GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 + 2 );
00229     version     = FT_NEXT_ULONG( p );
00230     format      = FT_NEXT_USHORT( p );
00231     horizOffset = FT_NEXT_USHORT( p );
00232     vertOffset  = FT_NEXT_USHORT( p );
00233     reserved    = FT_NEXT_USHORT( p );
00234 
00235     GXV_TRACE(( " (version = 0x%08x)\n", version ));
00236     GXV_TRACE(( " (format = 0x%04x)\n", format ));
00237     GXV_TRACE(( " (horizOffset = 0x%04x)\n", horizOffset ));
00238     GXV_TRACE(( " (vertOffset = 0x%04x)\n", vertOffset ));
00239     GXV_TRACE(( " (reserved = 0x%04x)\n", reserved ));
00240 
00241     /* Version 1.0 (always:1996) */
00242     if ( version != 0x00010000UL )
00243       FT_INVALID_FORMAT;
00244 
00245     /* format 0 (always:1996) */
00246     if ( format != 0x0000 )
00247       FT_INVALID_FORMAT;
00248 
00249     GXV_32BIT_ALIGNMENT_VALIDATE( horizOffset );
00250     GXV_32BIT_ALIGNMENT_VALIDATE( vertOffset );
00251 
00252     /* Reserved Fixed Value (always) */
00253     if ( reserved != 0x0000 )
00254       FT_INVALID_DATA;
00255 
00256     /* validate trackData */
00257     if ( 0 < horizOffset )
00258     {
00259       gxv_trak_trackData_validate( table + horizOffset, limit, valid );
00260       gxv_odtect_add_range( table + horizOffset, valid->subtable_length,
00261                             "horizJustData", odtect );
00262     }
00263 
00264     if ( 0 < vertOffset )
00265     {
00266       gxv_trak_trackData_validate( table + vertOffset, limit, valid );
00267       gxv_odtect_add_range( table + vertOffset, valid->subtable_length,
00268                             "vertJustData", odtect );
00269     }
00270 
00271     gxv_odtect_validate( odtect, valid );
00272 
00273     FT_TRACE4(( "\n" ));
00274   }
00275 
00276 
00277 /* END */
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