src/third_party/freetype2/src/gxvalid/gxvmorx0.c

/***************************************************************************/
/*                                                                         */
/*  gxvmorx0.c                                                             */
/*                                                                         */
/*    TrueTypeGX/AAT morx table validation                                 */
/*    body for type0 (Indic Script Rearrangement) subtable.                */
/*                                                                         */
/*  Copyright 2005-2015 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 "gxvmorx.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_gxvmorx


  static void
  gxv_morx_subtable_type0_entry_validate(
    FT_UShort                        state,
    FT_UShort                        flags,
    GXV_XStateTable_GlyphOffsetCPtr  glyphOffset_p,
    FT_Bytes                         table,
    FT_Bytes                         limit,
    GXV_Validator                    gxvalid )
  {
#ifdef GXV_LOAD_UNUSED_VARS
    FT_UShort  markFirst;
    FT_UShort  dontAdvance;
    FT_UShort  markLast;
#endif
    FT_UShort  reserved;
#ifdef GXV_LOAD_UNUSED_VARS
    FT_UShort  verb;
#endif

    FT_UNUSED( state );
    FT_UNUSED( glyphOffset_p );
    FT_UNUSED( table );
    FT_UNUSED( limit );


#ifdef GXV_LOAD_UNUSED_VARS
    markFirst   = (FT_UShort)( ( flags >> 15 ) & 1 );
    dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
    markLast    = (FT_UShort)( ( flags >> 13 ) & 1 );
#endif

    reserved = (FT_UShort)( flags & 0x1FF0 );
#ifdef GXV_LOAD_UNUSED_VARS
    verb     = (FT_UShort)( flags & 0x000F );
#endif

    if ( 0 < reserved )
    {
      GXV_TRACE(( " non-zero bits found in reserved range\n" ));
      FT_INVALID_DATA;
    }
  }


  FT_LOCAL_DEF( void )
  gxv_morx_subtable_type0_validate( FT_Bytes       table,
                                    FT_Bytes       limit,
                                    GXV_Validator  gxvalid )
  {
    FT_Bytes  p = table;


    GXV_NAME_ENTER(
      "morx chain subtable type0 (Indic-Script Rearrangement)" );

    GXV_LIMIT_CHECK( GXV_STATETABLE_HEADER_SIZE );

    gxvalid->xstatetable.optdata               = NULL;
    gxvalid->xstatetable.optdata_load_func     = NULL;
    gxvalid->xstatetable.subtable_setup_func   = NULL;
    gxvalid->xstatetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE;
    gxvalid->xstatetable.entry_validate_func =
      gxv_morx_subtable_type0_entry_validate;

    gxv_XStateTable_validate( p, limit, gxvalid );

    GXV_EXIT;
  }


/* END */