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

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• Hash : ee95b6f0
  Author :
  Date : 2004-09-10T14:39:00
  

  Adding OpenType validation module. The code is based on the (unfinished) `otlayout' module but has been heavily modified to make it much more compact. * src/otvalid/*: New module. * include/freetype/ftotval.h, src/base/ftotval.c, include/freetype/internal/services/svotval.h: New files. * include/freetype/config/ftmodule.h: Add otv_module_class. * include/freetype/config/ftheader.h (FT_OPENTYPE_VALIDATE_H): New macro. * include/freetype/internal/ftserv.h (FT_SERVICE_OPENTYPE_VALIDATE_H): New macro. * include/freetype/internal/fttrace.h (otvmodule, otvcommon, otvbase, otvgdef, otvgpos, otvgsub, otvjstf): New trace components. * include/freetype/ftchapters.h: Updated. * src/base/Jamfile (Library), src/base/descrip.mms (OBJS), src/base/rules.mk (BASE_EXT_SRC): Updated. * docs/CHANGES: Updated.

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• src/otvalid/otvjstf.c

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

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