kc3-lang/freetype/src/otvalid/otvjstf.c

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  Date : 2023-01-17T09:18:25
  

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• src/otvalid/otvjstf.c

• /****************************************************************************
   *
   * otvjstf.c
   *
   *   OpenType JSTF table validation (body).
   *
   * Copyright (C) 2004-2023 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"
  #include "otvgpos.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  otvjstf
  
  
  #define JstfPriorityFunc  otv_JstfPriority_validate
  #define JstfLookupFunc    otv_GPOS_subtable_validate
  
    /* uses otvalid->extra1 (GSUB lookup count) */
    /* uses otvalid->extra2 (GPOS lookup count) */
    /* sets otvalid->extra1 (counter)           */
  
    static void
    otv_JstfPriority_validate( FT_Bytes       table,
                               OTV_Validator  otvalid )
    {
      FT_Bytes  p = table;
      FT_UInt   table_size;
      FT_UInt   gsub_lookup_count, gpos_lookup_count;
  
      OTV_OPTIONAL_TABLE( ShrinkageEnableGSUB  );
      OTV_OPTIONAL_TABLE( ShrinkageDisableGSUB );
      OTV_OPTIONAL_TABLE( ShrinkageEnableGPOS  );
      OTV_OPTIONAL_TABLE( ShrinkageDisableGPOS );
      OTV_OPTIONAL_TABLE( ExtensionEnableGSUB  );
      OTV_OPTIONAL_TABLE( ExtensionDisableGSUB );
      OTV_OPTIONAL_TABLE( ExtensionEnableGPOS  );
      OTV_OPTIONAL_TABLE( ExtensionDisableGPOS );
      OTV_OPTIONAL_TABLE( ShrinkageJstfMax );
      OTV_OPTIONAL_TABLE( ExtensionJstfMax );
  
  
      OTV_ENTER;
      OTV_TRACE(( "JstfPriority table\n" ));
  
      OTV_LIMIT_CHECK( 20 );
  
      gsub_lookup_count = otvalid->extra1;
      gpos_lookup_count = otvalid->extra2;
  
      table_size = 20;
  
      otvalid->extra1 = gsub_lookup_count;
  
      OTV_OPTIONAL_OFFSET( ShrinkageEnableGSUB );
      OTV_SIZE_CHECK( ShrinkageEnableGSUB );
      if ( ShrinkageEnableGSUB )
        otv_x_ux( table + ShrinkageEnableGSUB, otvalid );
  
      OTV_OPTIONAL_OFFSET( ShrinkageDisableGSUB );
      OTV_SIZE_CHECK( ShrinkageDisableGSUB );
      if ( ShrinkageDisableGSUB )
        otv_x_ux( table + ShrinkageDisableGSUB, otvalid );
  
      otvalid->extra1 = gpos_lookup_count;
  
      OTV_OPTIONAL_OFFSET( ShrinkageEnableGPOS );
      OTV_SIZE_CHECK( ShrinkageEnableGPOS );
      if ( ShrinkageEnableGPOS )
        otv_x_ux( table + ShrinkageEnableGPOS, otvalid );
  
      OTV_OPTIONAL_OFFSET( ShrinkageDisableGPOS );
      OTV_SIZE_CHECK( ShrinkageDisableGPOS );
      if ( ShrinkageDisableGPOS )
        otv_x_ux( table + ShrinkageDisableGPOS, otvalid );
  
      OTV_OPTIONAL_OFFSET( ShrinkageJstfMax );
      OTV_SIZE_CHECK( ShrinkageJstfMax );
      if ( ShrinkageJstfMax )
      {
        /* XXX: check lookup types? */
        OTV_NEST2( JstfMax, JstfLookup );
        OTV_RUN( table + ShrinkageJstfMax, otvalid );
      }
  
      otvalid->extra1 = gsub_lookup_count;
  
      OTV_OPTIONAL_OFFSET( ExtensionEnableGSUB );
      OTV_SIZE_CHECK( ExtensionEnableGSUB );
      if ( ExtensionEnableGSUB )
        otv_x_ux( table + ExtensionEnableGSUB, otvalid );
  
      OTV_OPTIONAL_OFFSET( ExtensionDisableGSUB );
      OTV_SIZE_CHECK( ExtensionDisableGSUB );
      if ( ExtensionDisableGSUB )
        otv_x_ux( table + ExtensionDisableGSUB, otvalid );
  
      otvalid->extra1 = gpos_lookup_count;
  
      OTV_OPTIONAL_OFFSET( ExtensionEnableGPOS );
      OTV_SIZE_CHECK( ExtensionEnableGPOS );
      if ( ExtensionEnableGPOS )
        otv_x_ux( table + ExtensionEnableGPOS, otvalid );
  
      OTV_OPTIONAL_OFFSET( ExtensionDisableGPOS );
      OTV_SIZE_CHECK( ExtensionDisableGPOS );
      if ( ExtensionDisableGPOS )
        otv_x_ux( table + ExtensionDisableGPOS, otvalid );
  
      OTV_OPTIONAL_OFFSET( ExtensionJstfMax );
      OTV_SIZE_CHECK( ExtensionJstfMax );
      if ( ExtensionJstfMax )
      {
        /* XXX: check lookup types? */
        OTV_NEST2( JstfMax, JstfLookup );
        OTV_RUN( table + ExtensionJstfMax, otvalid );
      }
  
      otvalid->extra1 = gsub_lookup_count;
      otvalid->extra2 = gpos_lookup_count;
  
      OTV_EXIT;
    }
  
  
    /* sets otvalid->extra (glyph count)               */
    /* sets otvalid->func1 (otv_JstfPriority_validate) */
  
    static void
    otv_JstfScript_validate( FT_Bytes       table,
                             OTV_Validator  otvalid )
    {
      FT_Bytes  p = table;
      FT_UInt   table_size;
      FT_UInt   JstfLangSysCount;
  
      OTV_OPTIONAL_TABLE( ExtGlyph );
      OTV_OPTIONAL_TABLE( DefJstfLangSys );
  
  
      OTV_NAME_ENTER( "JstfScript" );
  
      OTV_LIMIT_CHECK( 6 );
      OTV_OPTIONAL_OFFSET( ExtGlyph );
      OTV_OPTIONAL_OFFSET( DefJstfLangSys );
      JstfLangSysCount = FT_NEXT_USHORT( p );
  
      OTV_TRACE(( " (JstfLangSysCount = %d)\n", JstfLangSysCount ));
  
      table_size = JstfLangSysCount * 6 + 6;
  
      OTV_SIZE_CHECK( ExtGlyph );
      if ( ExtGlyph )
      {
        otvalid->extra1 = otvalid->glyph_count;
        OTV_NEST1( ExtenderGlyph );
        OTV_RUN( table + ExtGlyph, otvalid );
      }
  
      OTV_SIZE_CHECK( DefJstfLangSys );
      if ( DefJstfLangSys )
      {
        OTV_NEST2( JstfLangSys, JstfPriority );
        OTV_RUN( table + DefJstfLangSys, otvalid );
      }
  
      OTV_LIMIT_CHECK( 6 * JstfLangSysCount );
  
      /* JstfLangSysRecord */
      OTV_NEST2( JstfLangSys, JstfPriority );
      for ( ; JstfLangSysCount > 0; JstfLangSysCount-- )
      {
        p += 4;       /* skip JstfLangSysTag */
  
        OTV_RUN( table + FT_NEXT_USHORT( p ), otvalid );
      }
  
      OTV_EXIT;
    }
  
  
    /* sets otvalid->extra1 (GSUB lookup count) */
    /* sets otvalid->extra2 (GPOS lookup count) */
    /* sets otvalid->glyph_count                */
  
    FT_LOCAL_DEF( void )
    otv_JSTF_validate( FT_Bytes      table,
                       FT_Bytes      gsub,
                       FT_Bytes      gpos,
                       FT_UInt       glyph_count,
                       FT_Validator  ftvalid )
    {
      OTV_ValidatorRec  otvalidrec;
      OTV_Validator     otvalid = &otvalidrec;
      FT_Bytes          p     = table;
      FT_UInt           JstfScriptCount;
  
  
      otvalid->root = ftvalid;
  
  
      FT_TRACE3(( "validating JSTF table\n" ));
      OTV_INIT;
  
      OTV_LIMIT_CHECK( 6 );
  
      if ( FT_NEXT_ULONG( p ) != 0x10000UL )      /* Version */
        FT_INVALID_FORMAT;
  
      JstfScriptCount = FT_NEXT_USHORT( p );
  
      FT_TRACE3(( " (JstfScriptCount = %d)\n", JstfScriptCount ));
  
      OTV_LIMIT_CHECK( JstfScriptCount * 6 );
  
      if ( gsub )
        otvalid->extra1 = otv_GSUBGPOS_get_Lookup_count( gsub );
      else
        otvalid->extra1 = 0;
  
      if ( gpos )
        otvalid->extra2 = otv_GSUBGPOS_get_Lookup_count( gpos );
      else
        otvalid->extra2 = 0;
  
      otvalid->glyph_count = glyph_count;
  
      /* JstfScriptRecord */
      for ( ; JstfScriptCount > 0; JstfScriptCount-- )
      {
        p += 4;       /* skip JstfScriptTag */
  
        /* JstfScript */
        otv_JstfScript_validate( table + FT_NEXT_USHORT( p ), otvalid );
      }
  
      FT_TRACE4(( "\n" ));
    }
  
  
  /* END */
  

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