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

• /***************************************************************************/
  /*                                                                         */
  /*  otvmod.c                                                               */
  /*                                                                         */
  /*    FreeType's OpenType validation module implementation (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 <ft2build.h>
  #include FT_TRUETYPE_TABLES_H
  #include FT_TRUETYPE_TAGS_H
  #include FT_OPENTYPE_VALIDATE_H
  #include FT_INTERNAL_OBJECTS_H
  #include FT_SERVICE_OPENTYPE_VALIDATE_H
  
  #include "otvmod.h"
  #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_otvmodule
  
  
    static FT_Error
    otv_load_table( FT_Face    face,
                    FT_Tag     tag,
                    FT_Byte*  *table,
                    FT_ULong  *table_len )
    {
      FT_Error   error;
      FT_Memory  memory = FT_FACE_MEMORY( face );
  
  
      error = FT_Load_Sfnt_Table( face, tag, 0, NULL, table_len );
      if ( error == OTV_Err_Table_Missing )
        return OTV_Err_Ok;
      if ( error )
        goto Exit;
  
      if ( FT_ALLOC( *table, *table_len ) )
        goto Exit;
  
      error = FT_Load_Sfnt_Table( face, tag, 0, *table, table_len );
  
    Exit:
      return error;
    }
  
  
    static FT_Error
    otv_validate( FT_Face    face,
                  FT_UInt    ot_flags,
                  FT_Bytes  *ot_base,
                  FT_Bytes  *ot_gdef,
                  FT_Bytes  *ot_gpos,
                  FT_Bytes  *ot_gsub,
                  FT_Bytes  *ot_jstf )
    {
      FT_Error         error = OTV_Err_Ok;
      FT_Byte          *base, *gdef, *gpos, *gsub, *jstf;
      FT_ULong         len_base, len_gdef, len_gpos, len_gsub, len_jstf;
      FT_ValidatorRec  valid;
  
  
      base     = gdef     = gpos     = gsub     = jstf     = NULL;
      len_base = len_gdef = len_gpos = len_gsub = len_jstf = 0;
  
      /* load tables */
  
      if ( ot_flags & FT_VALIDATE_BASE )
      {
        error = otv_load_table( face, TTAG_BASE, &base, &len_base );
        if ( error )
          goto Exit;
      }
  
      if ( ot_flags & FT_VALIDATE_GDEF )
      {
        error = otv_load_table( face, TTAG_GDEF, &gdef, &len_gdef );
        if ( error )
          goto Exit;
      }
  
      if ( ot_flags & FT_VALIDATE_GPOS )
      {
        error = otv_load_table( face, TTAG_GPOS, &gpos, &len_gpos );
        if ( error )
          goto Exit;
      }
  
      if ( ot_flags & FT_VALIDATE_GSUB )
      {
        error = otv_load_table( face, TTAG_GSUB, &gsub, &len_gsub );
        if ( error )
          goto Exit;
      }
  
      if ( ot_flags & FT_VALIDATE_JSTF )
      {
        error = otv_load_table( face, TTAG_JSTF, &jstf, &len_jstf );
        if ( error )
          goto Exit;
      }
  
      /* validate tables */
  
      if ( base )
      {
        ft_validator_init( &valid, base, base + len_base, FT_VALIDATE_DEFAULT );
        if ( ft_setjmp( valid.jump_buffer ) == 0 )
          otv_BASE_validate( base, &valid );
        error = valid.error;
        if ( error )
          goto Exit;
      }
  
      if ( gpos )
      {
        ft_validator_init( &valid, gpos, gpos + len_gpos, FT_VALIDATE_DEFAULT );
        if (ft_setjmp( valid.jump_buffer ) == 0 )
          otv_GPOS_validate( gpos, face->num_glyphs, &valid );
        error = valid.error;
        if ( error )
          goto Exit;
      }
  
      if ( gsub )
      {
        ft_validator_init( &valid, gsub, gsub + len_gsub, FT_VALIDATE_DEFAULT );
        if ( ft_setjmp( valid.jump_buffer ) == 0 )
          otv_GSUB_validate( gsub, face->num_glyphs, &valid );
        error = valid.error;
        if ( error )
          goto Exit;
      }
  
      if ( gdef )
      {
        ft_validator_init( &valid, gdef, gdef + len_gdef, FT_VALIDATE_DEFAULT );
        if ( ft_setjmp( valid.jump_buffer ) == 0 )
          otv_GDEF_validate( gdef, gsub, gpos, &valid );
        error = valid.error;
        if ( error )
          goto Exit;
      }
  
      if ( jstf )
      {
        ft_validator_init( &valid, jstf, jstf + len_jstf, FT_VALIDATE_DEFAULT );
        if ( ft_setjmp( valid.jump_buffer ) == 0 )
          otv_JSTF_validate( jstf, gsub, gpos, face->num_glyphs, &valid );
        error = valid.error;
        if ( error )
          goto Exit;
      }
  
      *ot_base = (FT_Bytes)base;
      *ot_gdef = (FT_Bytes)gdef;
      *ot_gpos = (FT_Bytes)gpos;
      *ot_gsub = (FT_Bytes)gsub;
      *ot_jstf = (FT_Bytes)jstf;
  
    Exit:
      return error;
    }
  
  
    static
    const FT_Service_OTvalidateRec  otvalid_interface = 
    {
      otv_validate
    };
  
  
    static
    const FT_ServiceDescRec  otvalid_services[] = 
    {
      { FT_SERVICE_ID_OPENTYPE_VALIDATE, &otvalid_interface },
      { NULL, NULL }
    };
  
  
    static FT_Pointer
    otvalid_get_service( FT_Module    module,
                         const char*  service_id )
    {
      FT_UNUSED( module );
  
      return ft_service_list_lookup( otvalid_services, service_id );
    }
  
  
    FT_CALLBACK_TABLE_DEF
    const FT_Module_Class  otv_module_class =
    {
      0,
      sizeof( FT_ModuleRec ),
      "otvalid",
      0x10000L,
      0x20000L,
  
      0,              /* module-specific interface */
  
      (FT_Module_Constructor)0,
      (FT_Module_Destructor) 0,
      (FT_Module_Requester)  otvalid_get_service
    };
  
  
  /* END */
  

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