text: ﻿/***************************************************************************/
  /*                                                                         */
  /*  otvbase.c                                                              */
  /*                                                                         */
  /*    OpenType BASE table validation (body).                               */
  /*                                                                         */
  /*  Copyright 2004, 2007 by                                                */
  /*  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.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #include "otvalid.h"
  #include "otvcommn.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_otvbase
  
  
    static void
    otv_BaseCoord_validate( FT_Bytes       table,
                            OTV_Validator  valid )
    {
      FT_Bytes  p = table;
      FT_UInt   BaseCoordFormat;
  
  
      OTV_NAME_ENTER( "BaseCoord" );
  
      OTV_LIMIT_CHECK( 4 );
      BaseCoordFormat = FT_NEXT_USHORT( p );
      p += 2;     /* skip Coordinate */
  
      OTV_TRACE(( " (format %d)\n", BaseCoordFormat ));
  
      switch ( BaseCoordFormat )
      {
      case 1:     /* BaseCoordFormat1 */
        break;
  
      case 2:     /* BaseCoordFormat2 */
        OTV_LIMIT_CHECK( 4 );   /* ReferenceGlyph, BaseCoordPoint */
        break;
  
      case 3:     /* BaseCoordFormat3 */
        OTV_LIMIT_CHECK( 2 );
        /* DeviceTable */
        otv_Device_validate( table + FT_NEXT_USHORT( p ), valid );
        break;
  
      default:
        FT_INVALID_FORMAT;
      }
  
      OTV_EXIT;
    }
  
  
    static void
    otv_BaseTagList_validate( FT_Bytes       table,
                              OTV_Validator  valid )
    {
      FT_Bytes  p = table;
      FT_UInt   BaseTagCount;
  
  
      OTV_NAME_ENTER( "BaseTagList" );
  
      OTV_LIMIT_CHECK( 2 );
  
      BaseTagCount = FT_NEXT_USHORT( p );
  
      OTV_TRACE(( " (BaseTagCount = %d)\n", BaseTagCount ));
  
      OTV_LIMIT_CHECK( BaseTagCount * 4 );          /* BaselineTag */
  
      OTV_EXIT;
    }
  
  
    static void
    otv_BaseValues_validate( FT_Bytes       table,
                             OTV_Validator  valid )
    {
      FT_Bytes  p = table;
      FT_UInt   BaseCoordCount;
  
  
      OTV_NAME_ENTER( "BaseValues" );
  
      OTV_LIMIT_CHECK( 4 );
  
      p             += 2;                     /* skip DefaultIndex */
      BaseCoordCount = FT_NEXT_USHORT( p );
  
      OTV_TRACE(( " (BaseCoordCount = %d)\n", BaseCoordCount ));
  
      OTV_LIMIT_CHECK( BaseCoordCount * 2 );
  
      /* BaseCoord */
      for ( ; BaseCoordCount > 0; BaseCoordCount-- )
        otv_BaseCoord_validate( table + FT_NEXT_USHORT( p ), valid );
  
      OTV_EXIT;
    }
  
  
    static void
    otv_MinMax_validate( FT_Bytes       table,
                         OTV_Validator  valid )
    {
      FT_Bytes  p = table;
      FT_UInt   table_size;
      FT_UInt   FeatMinMaxCount;
  
      OTV_OPTIONAL_TABLE( MinCoord );
      OTV_OPTIONAL_TABLE( MaxCoord );
  
  
      OTV_NAME_ENTER( "MinMax" );
  
      OTV_LIMIT_CHECK( 6 );
  
      OTV_OPTIONAL_OFFSET( MinCoord );
      OTV_OPTIONAL_OFFSET( MaxCoord );
      FeatMinMaxCount = FT_NEXT_USHORT( p );
  
      OTV_TRACE(( " (FeatMinMaxCount = %d)\n", FeatMinMaxCount ));
  
      table_size = FeatMinMaxCount * 8 + 6;
  
      OTV_SIZE_CHECK( MinCoord );
      if ( MinCoord )
        otv_BaseCoord_validate( table + MinCoord, valid );
  
      OTV_SIZE_CHECK( MaxCoord );
      if ( MaxCoord )
        otv_BaseCoord_validate( table + MaxCoord, valid );
  
      OTV_LIMIT_CHECK( FeatMinMaxCount * 8 );
  
      /* FeatMinMaxRecord */
      for ( ; FeatMinMaxCount > 0; FeatMinMaxCount-- )
      {
        p += 4;                           /* skip FeatureTableTag */
  
        OTV_OPTIONAL_OFFSET( MinCoord );
        OTV_OPTIONAL_OFFSET( MaxCoord );
  
        OTV_SIZE_CHECK( MinCoord );
        if ( MinCoord )
          otv_BaseCoord_validate( table + MinCoord, valid );
  
        OTV_SIZE_CHECK( MaxCoord );
        if ( MaxCoord )
          otv_BaseCoord_validate( table + MaxCoord, valid );
      }
  
      OTV_EXIT;
    }
  
  
    static void
    otv_BaseScript_validate( FT_Bytes       table,
                             OTV_Validator  valid )
    {
      FT_Bytes  p = table;
      FT_UInt   table_size;
      FT_UInt   BaseLangSysCount;
  
      OTV_OPTIONAL_TABLE( BaseValues    );
      OTV_OPTIONAL_TABLE( DefaultMinMax );
  
  
      OTV_NAME_ENTER( "BaseScript" );
  
      OTV_LIMIT_CHECK( 6 );
      OTV_OPTIONAL_OFFSET( BaseValues    );
      OTV_OPTIONAL_OFFSET( DefaultMinMax );
      BaseLangSysCount = FT_NEXT_USHORT( p );
  
      OTV_TRACE(( " (BaseLangSysCount = %d)\n", BaseLangSysCount ));
  
      table_size = BaseLangSysCount * 6 + 6;
  
      OTV_SIZE_CHECK( BaseValues );
      if ( BaseValues )
        otv_BaseValues_validate( table + BaseValues, valid );
  
      OTV_SIZE_CHECK( DefaultMinMax );
      if ( DefaultMinMax )
        otv_MinMax_validate( table + DefaultMinMax, valid );
  
      OTV_LIMIT_CHECK( BaseLangSysCount * 6 );
  
      /* BaseLangSysRecord */
      for ( ; BaseLangSysCount > 0; BaseLangSysCount-- )
      {
        p += 4;       /* skip BaseLangSysTag */
  
        otv_MinMax_validate( table + FT_NEXT_USHORT( p ), valid );
      }
  
      OTV_EXIT;
    }
  
  
    static void
    otv_BaseScriptList_validate( FT_Bytes       table,
                                 OTV_Validator  valid )
    {
      FT_Bytes  p = table;
      FT_UInt   BaseScriptCount;
  
  
      OTV_NAME_ENTER( "BaseScriptList" );
  
      OTV_LIMIT_CHECK( 2 );
      BaseScriptCount = FT_NEXT_USHORT( p );
  
      OTV_TRACE(( " (BaseScriptCount = %d)\n", BaseScriptCount ));
  
      OTV_LIMIT_CHECK( BaseScriptCount * 6 );
  
      /* BaseScriptRecord */
      for ( ; BaseScriptCount > 0; BaseScriptCount-- )
      {
        p += 4;       /* skip BaseScriptTag */
  
        /* BaseScript */
        otv_BaseScript_validate( table + FT_NEXT_USHORT( p ), valid );
      }
  
      OTV_EXIT;
    }
  
  
    static void
    otv_Axis_validate( FT_Bytes       table,
                       OTV_Validator  valid )
    {
      FT_Bytes  p = table;
      FT_UInt   table_size;
  
      OTV_OPTIONAL_TABLE( BaseTagList );
  
  
      OTV_NAME_ENTER( "Axis" );
  
      OTV_LIMIT_CHECK( 4 );
      OTV_OPTIONAL_OFFSET( BaseTagList );
  
      table_size = 4;
  
      OTV_SIZE_CHECK( BaseTagList );
      if ( BaseTagList )
        otv_BaseTagList_validate( table + BaseTagList, valid );
  
      /* BaseScriptList */
      otv_BaseScriptList_validate( table + FT_NEXT_USHORT( p ), valid );
  
      OTV_EXIT;
    }
  
  
    FT_LOCAL_DEF( void )
    otv_BASE_validate( FT_Bytes      table,
                       FT_Validator  ftvalid )
    {
      OTV_ValidatorRec  validrec;
      OTV_Validator     valid = &validrec;
      FT_Bytes          p     = table;
      FT_UInt           table_size;
  
      OTV_OPTIONAL_TABLE( HorizAxis );
      OTV_OPTIONAL_TABLE( VertAxis  );
  
  
      valid->root = ftvalid;
  
      FT_TRACE3(( "validating BASE table\n" ));
      OTV_INIT;
  
      OTV_LIMIT_CHECK( 6 );
  
      if ( FT_NEXT_ULONG( p ) != 0x10000UL )      /* Version */
        FT_INVALID_FORMAT;
  
      table_size = 6;
  
      OTV_OPTIONAL_OFFSET( HorizAxis );
      OTV_SIZE_CHECK( HorizAxis );
      if ( HorizAxis )
        otv_Axis_validate( table + HorizAxis, valid );
  
      OTV_OPTIONAL_OFFSET( VertAxis );
      OTV_SIZE_CHECK( VertAxis );
      if ( VertAxis )
        otv_Axis_validate( table + VertAxis, valid );
  
      FT_TRACE4(( "\n" ));
    }
  
  
  /* END */
  