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

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• Hash : 9ac9060d
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  Date : 2018-06-03T09:01:17
  

  [GSoC] src/*.*: Convert block comments to `light' style. This monster commit was created by applying Nikhil's scripts `docconverter.py' and `markify.py' to all C header and source files, followed up by minor manual clean-up. No change in functionality, of course. I used commit f7419907bc6044b9b7057f9789866426c804ba82 from https://github.com/nikramakrishnan/freetype-docs.git.

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• src/gxvalid/gxvopbd.c

• /****************************************************************************
   *
   * gxvopbd.c
   *
   *   TrueTypeGX/AAT opbd table validation (body).
   *
   * Copyright 2004-2018 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 */
  

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