kc3-lang/freetype/src/gxvalid/gxvopbd.c

• Show log

  Commit

• Hash : 17b6291d
  Author :
  Date : 2015-02-25T07:53:09
  

  [gxvalid] Signedness fixes. * src/gxvalid/gxvbsln.c, src/gxvalid/gxvcommn.c, src/gxvalid/gxvcommn.h, src/gxvalid/gxvjust.c, src/gxvalid/gxvkern.c, src/gxvalid/gxvlcar.c, src/gxvalid/gxvmort.c, src/gxvalid/gxvmort1.c, src/gxvalid/gxvmort2.c, src/gxvalid/gxvmorx.c, src/gxvalid/gxvmorx1.c, src/gxvalid/gxvmorx2.c, src/gxvalid/gxvopbd.c, src/gxvalid/gxvprop.c, src/gxvalid/gxvtrak.c: Apply.

Download

• src/gxvalid/gxvopbd.c

• /***************************************************************************/
  /*                                                                         */
  /*  gxvopbd.c                                                              */
  /*                                                                         */
  /*    TrueTypeGX/AAT opbd table validation (body).                         */
  /*                                                                         */
  /*  Copyright 2004-2015 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_gxvopbd
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                      Data and Types                           *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
    typedef struct  GXV_opbd_DataRec_
    {
      FT_UShort  format;
      FT_UShort  valueOffset_min;
  
    } GXV_opbd_DataRec, *GXV_opbd_Data;
  
  
  #define GXV_OPBD_DATA( FIELD )  GXV_TABLE_DATA( opbd, FIELD )
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                      UTILITY FUNCTIONS                        *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
    static void
    gxv_opbd_LookupValue_validate( FT_UShort            glyph,
                                   GXV_LookupValueCPtr  value_p,
                                   GXV_Validator        gxvalid )
    {
      /* offset in LookupTable is measured from the head of opbd table */
      FT_Bytes   p     = gxvalid->root->base + value_p->u;
      FT_Bytes   limit = gxvalid->root->limit;
      FT_Short   delta_value;
      int        i;
  
  
      if ( value_p->u < GXV_OPBD_DATA( valueOffset_min ) )
        GXV_OPBD_DATA( valueOffset_min ) = value_p->u;
  
      for ( i = 0; i < 4; i++ )
      {
        GXV_LIMIT_CHECK( 2 );
        delta_value = FT_NEXT_SHORT( p );
  
        if ( GXV_OPBD_DATA( format ) )    /* format 1, value is ctrl pt. */
        {
          if ( delta_value == -1 )
            continue;
  
          gxv_ctlPoint_validate( glyph, (FT_UShort)delta_value, gxvalid );
        }
        else                              /* format 0, value is distance */
          continue;
      }
    }
  
  
    /*
      opbd ---------------------+
                                |
      +===============+         |
      | lookup header |         |
      +===============+         |
      | BinSrchHeader |         |
      +===============+         |
      | lastGlyph[0]  |         |
      +---------------+         |
      | firstGlyph[0] |         |  head of opbd sfnt table
      +---------------+         |             +
      | offset[0]     |    ->   |          offset            [byte]
      +===============+         |             +
      | lastGlyph[1]  |         | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte]
      +---------------+         |
      | firstGlyph[1] |         |
      +---------------+         |
      | offset[1]     |         |
      +===============+         |
                                |
       ....                     |
                                |
      48bit value array         |
      +===============+         |
      |     value     | <-------+
      |               |
      |               |
      |               |
      +---------------+
      .... */
  
    static GXV_LookupValueDesc
    gxv_opbd_LookupFmt4_transit( FT_UShort            relative_gindex,
                                 GXV_LookupValueCPtr  base_value_p,
                                 FT_Bytes             lookuptbl_limit,
                                 GXV_Validator        gxvalid )
    {
      GXV_LookupValueDesc  value;
  
      FT_UNUSED( lookuptbl_limit );
      FT_UNUSED( gxvalid );
  
      /* XXX: check range? */
      value.u = (FT_UShort)( base_value_p->u +
                             relative_gindex * 4 * sizeof ( FT_Short ) );
  
      return value;
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                         opbd TABLE                            *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
    FT_LOCAL_DEF( void )
    gxv_opbd_validate( FT_Bytes      table,
                       FT_Face       face,
                       FT_Validator  ftvalid )
    {
      GXV_ValidatorRec  gxvalidrec;
      GXV_Validator     gxvalid = &gxvalidrec;
      GXV_opbd_DataRec  opbdrec;
      GXV_opbd_Data     opbd  = &opbdrec;
      FT_Bytes          p     = table;
      FT_Bytes          limit = 0;
  
      FT_ULong  version;
  
  
      gxvalid->root       = ftvalid;
      gxvalid->table_data = opbd;
      gxvalid->face       = face;
  
      FT_TRACE3(( "validating `opbd' table\n" ));
      GXV_INIT;
      GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU;
  
  
      GXV_LIMIT_CHECK( 4 + 2 );
      version                 = FT_NEXT_ULONG( p );
      GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p );
  
  
      /* only 0x00010000 is defined (1996) */
      GXV_TRACE(( "(version=0x%08x)\n", version ));
      if ( 0x00010000UL != version )
        FT_INVALID_FORMAT;
  
      /* only values 0 and 1 are defined (1996) */
      GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) ));
      if ( 0x0001 < GXV_OPBD_DATA( format ) )
        FT_INVALID_FORMAT;
  
      gxvalid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;
      gxvalid->lookupval_func   = gxv_opbd_LookupValue_validate;
      gxvalid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit;
  
      gxv_LookupTable_validate( p, limit, gxvalid );
      p += gxvalid->subtable_length;
  
      if ( p > table + GXV_OPBD_DATA( valueOffset_min ) )
      {
        GXV_TRACE((
          "found overlap between LookupTable and opbd_value array\n" ));
        FT_INVALID_OFFSET;
      }
  
      FT_TRACE4(( "\n" ));
    }
  
  
  /* END */
  

Download