kc3-lang/freetype/src/type42/t42drivr.c

• Show log

  Commit

• Hash : ff0ef828
  Author :
  Date : 2023-05-07T07:19:44
  

  * src/type42/t42drivr.c: Clean up interface. Ensure that all driver functions use the signature of the service or driver. This avoids pointer mismatches, which are technically undefined behaviour. Recent compilers are more picky in catching them as part of Control Flow Integrity tests.

Download

• src/type42/t42drivr.c

• /****************************************************************************
   *
   * t42drivr.c
   *
   *   High-level Type 42 driver interface (body).
   *
   * Copyright (C) 2002-2023 by
   * Roberto Alameda.
   *
   * 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.
   *
   */
  
  
    /**************************************************************************
     *
     * This driver implements Type42 fonts as described in the
     * Technical Note #5012 from Adobe, with these limitations:
     *
     * 1) CID Fonts are not currently supported.
     * 2) Incremental fonts making use of the GlyphDirectory keyword
     *    will be loaded, but the rendering will be using the TrueType
     *    tables.
     * 3) As for Type1 fonts, CDevProc is not supported.
     * 4) The Metrics dictionary is not supported.
     * 5) AFM metrics are not supported.
     *
     * In other words, this driver supports Type42 fonts derived from
     * TrueType fonts in a non-CID manner, as done by usual conversion
     * programs.
     *
     */
  
  
  #include "t42drivr.h"
  #include "t42objs.h"
  #include "t42error.h"
  #include <freetype/internal/ftdebug.h>
  
  #include <freetype/internal/services/svfntfmt.h>
  #include <freetype/internal/services/svgldict.h>
  #include <freetype/internal/services/svpostnm.h>
  #include <freetype/internal/services/svpsinfo.h>
  
  #undef  FT_COMPONENT
  #define FT_COMPONENT  t42
  
  
    /*
     *
     * GLYPH DICT SERVICE
     *
     */
  
    FT_CALLBACK_DEF( FT_Error )
    t42_get_glyph_name( FT_Face     face,        /* T42_Face */
                        FT_UInt     glyph_index,
                        FT_Pointer  buffer,
                        FT_UInt     buffer_max )
    {
      T42_Face  t42face = (T42_Face)face;
  
  
      FT_STRCPYN( buffer,
                  t42face->type1.glyph_names[glyph_index],
                  buffer_max );
  
      return FT_Err_Ok;
    }
  
  
    FT_CALLBACK_DEF( FT_UInt )
    t42_get_name_index( FT_Face           face,        /* T42_Face */
                        const FT_String*  glyph_name )
    {
      T42_Face  t42face = (T42_Face)face;
      FT_Int    i;
  
  
      for ( i = 0; i < t42face->type1.num_glyphs; i++ )
      {
        FT_String*  gname = t42face->type1.glyph_names[i];
  
  
        if ( glyph_name[0] == gname[0] && !ft_strcmp( glyph_name, gname ) )
          return (FT_UInt)ft_strtol(
                            (const char *)t42face->type1.charstrings[i],
                            NULL,
                            10 );
      }
  
      return 0;
    }
  
  
    static const FT_Service_GlyphDictRec  t42_service_glyph_dict =
    {
      (FT_GlyphDict_GetNameFunc)  t42_get_glyph_name,    /* get_name   */
      (FT_GlyphDict_NameIndexFunc)t42_get_name_index     /* name_index */
    };
  
  
    /*
     *
     * POSTSCRIPT NAME SERVICE
     *
     */
  
    FT_CALLBACK_DEF( const char* )
    t42_get_ps_font_name( FT_Face  face )    /* T42_Face */
    {
      T42_Face  t42face = (T42_Face)face;
  
  
      return (const char*)t42face->type1.font_name;
    }
  
  
    static const FT_Service_PsFontNameRec  t42_service_ps_font_name =
    {
      (FT_PsName_GetFunc)t42_get_ps_font_name   /* get_ps_font_name */
    };
  
  
    /*
     *
     * POSTSCRIPT INFO SERVICE
     *
     */
  
    FT_CALLBACK_DEF( FT_Error )
    t42_ps_get_font_info( FT_Face          face,
                          PS_FontInfoRec*  afont_info )
    {
      *afont_info = ((T42_Face)face)->type1.font_info;
  
      return FT_Err_Ok;
    }
  
  
    FT_CALLBACK_DEF( FT_Error )
    t42_ps_get_font_extra( FT_Face           face,
                           PS_FontExtraRec*  afont_extra )
    {
      *afont_extra = ((T42_Face)face)->type1.font_extra;
  
      return FT_Err_Ok;
    }
  
  
    FT_CALLBACK_DEF( FT_Int )
    t42_ps_has_glyph_names( FT_Face  face )
    {
      FT_UNUSED( face );
  
      return 1;
    }
  
  
    static const FT_Service_PsInfoRec  t42_service_ps_info =
    {
      (PS_GetFontInfoFunc)   t42_ps_get_font_info,    /* ps_get_font_info    */
      (PS_GetFontExtraFunc)  t42_ps_get_font_extra,   /* ps_get_font_extra   */
      (PS_HasGlyphNamesFunc) t42_ps_has_glyph_names,  /* ps_has_glyph_names  */
      /* Type42 fonts don't have a Private dict */
      (PS_GetFontPrivateFunc)NULL,                    /* ps_get_font_private */
      /* not implemented */
      (PS_GetFontValueFunc)  NULL                     /* ps_get_font_value   */
    };
  
  
    /*
     *
     * SERVICE LIST
     *
     */
  
    static const FT_ServiceDescRec  t42_services[] =
    {
      { FT_SERVICE_ID_GLYPH_DICT,           &t42_service_glyph_dict },
      { FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &t42_service_ps_font_name },
      { FT_SERVICE_ID_POSTSCRIPT_INFO,      &t42_service_ps_info },
      { FT_SERVICE_ID_FONT_FORMAT,          FT_FONT_FORMAT_TYPE_42 },
      { NULL, NULL }
    };
  
  
    FT_CALLBACK_DEF( FT_Module_Interface )
    T42_Get_Interface( FT_Module         module,
                       const FT_String*  t42_interface )
    {
      FT_UNUSED( module );
  
      return ft_service_list_lookup( t42_services, t42_interface );
    }
  
  
    const FT_Driver_ClassRec  t42_driver_class =
    {
      {
        FT_MODULE_FONT_DRIVER       |
        FT_MODULE_DRIVER_SCALABLE   |
  #ifdef TT_USE_BYTECODE_INTERPRETER
        FT_MODULE_DRIVER_HAS_HINTER,
  #else
        0,
  #endif
  
        sizeof ( T42_DriverRec ),
  
        "type42",
        0x10000L,
        0x20000L,
  
        NULL,    /* module-specific interface */
  
        T42_Driver_Init,          /* FT_Module_Constructor  module_init   */
        T42_Driver_Done,          /* FT_Module_Destructor   module_done   */
        T42_Get_Interface,        /* FT_Module_Requester    get_interface */
      },
  
      sizeof ( T42_FaceRec ),
      sizeof ( T42_SizeRec ),
      sizeof ( T42_GlyphSlotRec ),
  
      T42_Face_Init,              /* FT_Face_InitFunc  init_face */
      T42_Face_Done,              /* FT_Face_DoneFunc  done_face */
      T42_Size_Init,              /* FT_Size_InitFunc  init_size */
      T42_Size_Done,              /* FT_Size_DoneFunc  done_size */
      T42_GlyphSlot_Init,         /* FT_Slot_InitFunc  init_slot */
      T42_GlyphSlot_Done,         /* FT_Slot_DoneFunc  done_slot */
  
      T42_GlyphSlot_Load,         /* FT_Slot_LoadFunc  load_glyph */
  
      NULL,                       /* FT_Face_GetKerningFunc   get_kerning  */
      NULL,                       /* FT_Face_AttachFunc       attach_file  */
      NULL,                       /* FT_Face_GetAdvancesFunc  get_advances */
  
      T42_Size_Request,           /* FT_Size_RequestFunc  request_size */
      T42_Size_Select             /* FT_Size_SelectFunc   select_size  */
    };
  
  
  /* END */
  

Download