gxvjust.c

奇趣公司比较新的qt/emd版本

    valid->subtable_length = p - table;

    GXV_EXIT;
  }


  static void
  gxv_just_pcTable_LookupValue_entry_validate( FT_UShort            glyph,
                                               GXV_LookupValueDesc  value,
                                               GXV_Validator        valid )
  {
    FT_UNUSED( glyph );

    if ( value.u > GXV_JUST_DATA( pc_offset_max ) )
      GXV_JUST_DATA( pc_offset_max ) = value.u;
    if ( value.u < GXV_JUST_DATA( pc_offset_max ) )
      GXV_JUST_DATA( pc_offset_min ) = value.u;
  }


  static void
  gxv_just_pcLookupTable_validate( FT_Bytes       table,
                                   FT_Bytes       limit,
                                   GXV_Validator  valid )
  {
    FT_Bytes p = table;


    GXV_NAME_ENTER( "just pcLookupTable" );
    GXV_JUST_DATA( pc_offset_max ) = 0x0000;
    GXV_JUST_DATA( pc_offset_min ) = 0xFFFFU;

    valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
    valid->lookupval_func = gxv_just_pcTable_LookupValue_entry_validate;

    gxv_LookupTable_validate( p, limit, valid );

    /* subtable_length is set by gxv_LookupTable_validate() */

    GXV_EXIT;
  }


  static void
  gxv_just_postcompTable_validate( FT_Bytes       table,
                                   FT_Bytes       limit,
                                   GXV_Validator  valid )
  {
    FT_Bytes  p = table;


    GXV_NAME_ENTER( "just postcompTable" );

    gxv_just_pcLookupTable_validate( p, limit, valid );
    p += valid->subtable_length;

    gxv_just_pcActionRecord_validate( p, limit, valid );
    p += valid->subtable_length;

    valid->subtable_length = p - table;

    GXV_EXIT;
  }


  static void
  gxv_just_classTable_entry_validate(
    FT_Byte                         state,
    FT_UShort                       flags,
    GXV_StateTable_GlyphOffsetDesc  glyphOffset,
    FT_Bytes                        table,
    FT_Bytes                        limit,
    GXV_Validator                   valid )
  {
    FT_UShort  setMark;
    FT_UShort  dontAdvance;
    FT_UShort  markClass;
    FT_UShort  currentClass;

    FT_UNUSED( state );
    FT_UNUSED( glyphOffset );
    FT_UNUSED( table );
    FT_UNUSED( limit );
    FT_UNUSED( valid );


    setMark      = (FT_UShort)( ( flags >> 15 ) & 1    );
    dontAdvance  = (FT_UShort)( ( flags >> 14 ) & 1    );
    markClass    = (FT_UShort)( ( flags >> 7  ) & 0x7F );
    currentClass = (FT_UShort)(   flags         & 0x7F );

    /* TODO: validate markClass & currentClass */
  }


  static void
  gxv_just_justClassTable_validate ( FT_Bytes       table,
                                     FT_Bytes       limit,
                                     GXV_Validator  valid )
  {
    FT_Bytes   p = table;
    FT_UShort  length;
    FT_UShort  coverage;
    FT_ULong   subFeatureFlags;


    GXV_NAME_ENTER( "just justClassTable" );

    GXV_LIMIT_CHECK( 2 + 2 + 4 );
    length          = FT_NEXT_USHORT( p );
    coverage        = FT_NEXT_USHORT( p );
    subFeatureFlags = FT_NEXT_ULONG( p );

    GXV_TRACE(( "  justClassTable: coverage = 0x%04x (%s)",
                coverage,
                ( 0x4000 & coverage ) == 0 ? "ascending" : "descending" ));

    valid->statetable.optdata               = NULL;
    valid->statetable.optdata_load_func     = NULL;
    valid->statetable.subtable_setup_func   = NULL;
    valid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE;
    valid->statetable.entry_validate_func   =
      gxv_just_classTable_entry_validate;

    gxv_StateTable_validate( p, table + length, valid );

    /* subtable_length is set by gxv_LookupTable_validate() */

    GXV_EXIT;
  }


  static void
  gxv_just_wdcTable_LookupValue_validate( FT_UShort            glyph,
                                          GXV_LookupValueDesc  value,
                                          GXV_Validator        valid )
  {
    FT_UNUSED( glyph );

    if ( value.u > GXV_JUST_DATA( wdc_offset_max ) )
      GXV_JUST_DATA( wdc_offset_max ) = value.u;
    if ( value.u < GXV_JUST_DATA( wdc_offset_min ) )
      GXV_JUST_DATA( wdc_offset_min ) = value.u;
  }


  static void
  gxv_just_justData_lookuptable_validate( FT_Bytes       table,
                                          FT_Bytes       limit,
                                          GXV_Validator  valid )
  {
    FT_Bytes  p = table;


    GXV_JUST_DATA( wdc_offset_max ) = 0x0000;
    GXV_JUST_DATA( wdc_offset_min ) = 0xFFFFU;

    valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
    valid->lookupval_func = gxv_just_wdcTable_LookupValue_validate;

    gxv_LookupTable_validate( p, limit, valid );

    /* subtable_length is set by gxv_LookupTable_validate() */

    GXV_EXIT;
  }


  /*
   * gxv_just_justData_validate() parses and validates horizData, vertData.
   */
  static void
  gxv_just_justData_validate( FT_Bytes       table,
                              FT_Bytes       limit,
                              GXV_Validator  valid )
  {
    /*
     * following 3 offsets are measured from the start of `just'
     * (which table points to), not justData
     */
    FT_UShort  justClassTableOffset;
    FT_UShort  wdcTableOffset;
    FT_UShort  pcTableOffset;
    FT_Bytes   p = table;

    GXV_ODTECT( 4, odtect );


    GXV_NAME_ENTER( "just justData" );

    GXV_ODTECT_INIT( odtect );
    GXV_LIMIT_CHECK( 2 + 2 + 2 );
    justClassTableOffset = FT_NEXT_USHORT( p );
    wdcTableOffset       = FT_NEXT_USHORT( p );
    pcTableOffset        = FT_NEXT_USHORT( p );

    GXV_TRACE(( " (justClassTableOffset = 0x%04x)\n", justClassTableOffset ));
    GXV_TRACE(( " (wdcTableOffset = 0x%04x)\n", wdcTableOffset ));
    GXV_TRACE(( " (pcTableOffset = 0x%04x)\n", pcTableOffset ));

    gxv_just_justData_lookuptable_validate( p, limit, valid );
    gxv_odtect_add_range( p, valid->subtable_length,
                          "just_LookupTable", odtect );

    if ( wdcTableOffset )
    {
      gxv_just_widthDeltaClusters_validate(
        valid->root->base + wdcTableOffset, limit, valid );
      gxv_odtect_add_range( valid->root->base + wdcTableOffset,
                            valid->subtable_length, "just_wdcTable", odtect );
    }

    if ( pcTableOffset )
    {
      gxv_just_postcompTable_validate( valid->root->base + pcTableOffset,
                                       limit, valid );
      gxv_odtect_add_range( valid->root->base + pcTableOffset,
                            valid->subtable_length, "just_pcTable", odtect );
    }

    if ( justClassTableOffset )
    {
      gxv_just_justClassTable_validate(
        valid->root->base + justClassTableOffset, limit, valid );
      gxv_odtect_add_range( valid->root->base + justClassTableOffset,
                            valid->subtable_length, "just_justClassTable",
                            odtect );
    }

    gxv_odtect_validate( odtect, valid );

    GXV_EXIT;
  }


  FT_LOCAL_DEF( void )
  gxv_just_validate( FT_Bytes      table,
                     FT_Face       face,
                     FT_Validator  ftvalid )
  {
    FT_Bytes           p     = table;
    FT_Bytes           limit = 0;
    FT_UInt            table_size;

    GXV_ValidatorRec   validrec;
    GXV_Validator      valid = &validrec;
    GXV_just_DataRec   justrec;
    GXV_just_Data      just = &justrec;

    FT_ULong           version;
    FT_UShort          format;
    FT_UShort          horizOffset;
    FT_UShort          vertOffset;

    GXV_ODTECT( 3, odtect );


    GXV_ODTECT_INIT( odtect );

    valid->root       = ftvalid;
    valid->table_data = just;
    valid->face       = face;

    FT_TRACE3(( "validating `just' table\n" ));
    GXV_INIT;

    limit      = valid->root->limit;
    table_size = limit - table;

    GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 );
    version     = FT_NEXT_ULONG( p );
    format      = FT_NEXT_USHORT( p );
    horizOffset = FT_NEXT_USHORT( p );
    vertOffset  = FT_NEXT_USHORT( p );
    gxv_odtect_add_range( table, p - table, "just header", odtect );


    /* Version 1.0 (always:2000) */
    GXV_TRACE(( " (version = 0x%08x)\n", version ));
    if ( version != 0x00010000UL )
      FT_INVALID_FORMAT;

    /* format 0 (always:2000) */
    GXV_TRACE(( " (format = 0x%04x)\n", format ));
    if ( format != 0x0000 )
        FT_INVALID_FORMAT;

    GXV_TRACE(( " (horizOffset = %d)\n", horizOffset  ));
    GXV_TRACE(( " (vertOffset = %d)\n", vertOffset  ));


    /* validate justData */
    if ( 0 < horizOffset )
    {
      gxv_just_justData_validate( table + horizOffset, limit, valid );
      gxv_odtect_add_range( table + horizOffset, valid->subtable_length,
                            "horizJustData", odtect );
    }

    if ( 0 < vertOffset )
    {
      gxv_just_justData_validate( table + vertOffset, limit, valid );
      gxv_odtect_add_range( table + vertOffset, valid->subtable_length,
                            "vertJustData", odtect );
    }

    gxv_odtect_validate( odtect, valid );

    FT_TRACE4(( "\n" ));
  }


/* END */