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ftmac.c

/***************************************************************************/
/*                                                                         */
/*  ftmac.c                                                                */
/*                                                                         */
/*    Mac FOND support.  Written by just@letterror.com.                    */
/*  Heavily modified by mpsuzuki, George Williams, and Sean McBride.       */
/*                                                                         */
/*  This file is for Mac OS X only; see builds/mac/ftoldmac.c for          */
/*  classic platforms built by MPW.                                        */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 by             */
/*  Just van Rossum, 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.                                        */
/*                                                                         */
/***************************************************************************/


  /*
    Notes

    Mac suitcase files can (and often do!) contain multiple fonts.  To
    support this I use the face_index argument of FT_(Open|New)_Face()
    functions, and pretend the suitcase file is a collection.

    Warning: fbit and NFNT bitmap resources are not supported yet.  In old
    sfnt fonts, bitmap glyph data for each size is stored in each `NFNT'
    resources instead of the `bdat' table in the sfnt resource.  Therefore,
    face->num_fixed_sizes is set to 0, because bitmap data in `NFNT'
    resource is unavailable at present.

    The Mac FOND support works roughly like this:

    - Check whether the offered stream points to a Mac suitcase file.  This
      is done by checking the file type: it has to be 'FFIL' or 'tfil'.  The
      stream that gets passed to our init_face() routine is a stdio stream,
      which isn't usable for us, since the FOND resources live in the
      resource fork.  So we just grab the stream->pathname field.

    - Read the FOND resource into memory, then check whether there is a
      TrueType font and/or(!) a Type 1 font available.

    - If there is a Type 1 font available (as a separate `LWFN' file), read
      its data into memory, massage it slightly so it becomes PFB data, wrap
      it into a memory stream, load the Type 1 driver and delegate the rest
      of the work to it by calling FT_Open_Face().  (XXX TODO: after this
      has been done, the kerning data from the FOND resource should be
      appended to the face: On the Mac there are usually no AFM files
      available.  However, this is tricky since we need to map Mac char
      codes to ps glyph names to glyph ID's...)

    - If there is a TrueType font (an `sfnt' resource), read it into memory,
      wrap it into a memory stream, load the TrueType driver and delegate
      the rest of the work to it, by calling FT_Open_Face().

    - Some suitcase fonts (notably Onyx) might point the `LWFN' file to
      itself, even though it doesn't contains `POST' resources.  To handle
      this special case without opening the file an extra time, we just
      ignore errors from the `LWFN' and fallback to the `sfnt' if both are
      available.
  */


#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_INTERNAL_STREAM_H

  /* This is for Mac OS X.  Without redefinition, OS_INLINE */
  /* expands to `static inline' which doesn't survive the   */
  /* -ansi compilation flag of GCC.                         */
#if !HAVE_ANSI_OS_INLINE
#undef  OS_INLINE
#define OS_INLINE  static __inline__
#endif
#include <Carbon/Carbon.h>

#ifndef HFS_MAXPATHLEN
#define HFS_MAXPATHLEN  1024
#endif

#define FT_DEPRECATED_ATTRIBUTE

#include FT_MAC_H

  /* undefine blocking-macros in ftmac.h */
#undef FT_GetFile_From_Mac_Name( a, b, c )
#undef FT_GetFile_From_Mac_ATS_Name( a, b, c )
#undef FT_New_Face_From_FSSpec( a, b, c, d )


  /* Set PREFER_LWFN to 1 if LWFN (Type 1) is preferred over
     TrueType in case *both* are available (this is not common,
     but it *is* possible). */
#ifndef PREFER_LWFN
#define PREFER_LWFN  1
#endif


  FT_EXPORT_DEF( FT_Error )
  FT_GetFile_From_Mac_Name( const char*  fontName,
                            FSSpec*      pathSpec,
                            FT_Long*     face_index )
  {
    FT_UNUSED( fontName );
    FT_UNUSED( pathSpec );
    FT_UNUSED( face_index );

    return FT_Err_Unimplemented_Feature;
  }


  /* Private function.                                         */
  /* The FSSpec type has been discouraged for a long time,     */
  /* but for some reason, there is no FSRef version of         */
  /* ATSFontGetFileSpecification(), so we made our own.        */
  /* Apple will provide one eventually.                        */
  static OSStatus
  FT_ATSFontGetFileReference( ATSFontRef  ats_font_id,
                              FSRef*      ats_font_ref )
  {
#if __LP64__
    FT_UNUSED( ats_font_id );
    FT_UNUSED( ats_font_ref );

    return fnfErr;
#else
    OSStatus  err;
    FSSpec    spec;


    err = ATSFontGetFileSpecification( ats_font_id, &spec );
    if ( noErr == err )
      err = FSpMakeFSRef( &spec, ats_font_ref );

    return err;
#endif
  }


  static FT_Error
  FT_GetFileRef_From_Mac_ATS_Name( const char*  fontName,
                                   FSRef*       ats_font_ref,
                                   FT_Long*     face_index )
  {
    CFStringRef  cf_fontName;
    ATSFontRef   ats_font_id;


    *face_index = 0;

    cf_fontName = CFStringCreateWithCString( NULL, fontName,
                                             kCFStringEncodingMacRoman );
    ats_font_id = ATSFontFindFromName( cf_fontName,
                                       kATSOptionFlagsUnRestrictedScope );
    CFRelease( cf_fontName );

    if ( ats_font_id == 0 || ats_font_id == 0xFFFFFFFFUL )
      return FT_Err_Unknown_File_Format;

    if ( noErr != FT_ATSFontGetFileReference( ats_font_id, ats_font_ref ) )
      return FT_Err_Unknown_File_Format;

    /* face_index calculation by searching preceding fontIDs */
    /* with same FSRef                                       */
    {
      ATSFontRef  id2 = ats_font_id - 1;
      FSRef       ref2;


      while ( id2 > 0 )
      {
        if ( noErr != FT_ATSFontGetFileReference( id2, &ref2 ) )
          break;
        if ( noErr != FSCompareFSRefs( ats_font_ref, &ref2 ) )
          break;

        id2 --;
      }
      *face_index = ats_font_id - ( id2 + 1 );
    }

    return FT_Err_Ok;
  }


  FT_EXPORT_DEF( FT_Error )
  FT_GetFilePath_From_Mac_ATS_Name( const char*  fontName,
                                    UInt8*       path,
                                    UInt32       maxPathSize,
                                    FT_Long*     face_index )
  {
    FSRef     ref;
    FT_Error  err;


    err = FT_GetFileRef_From_Mac_ATS_Name( fontName, &ref, face_index );
    if ( FT_Err_Ok != err )
      return err;

    if ( noErr != FSRefMakePath( &ref, path, maxPathSize ) )
      return FT_Err_Unknown_File_Format;

    return FT_Err_Ok;
  }


  /* This function is deprecated because FSSpec is deprecated in Mac OS X  */
  FT_EXPORT_DEF( FT_Error )
  FT_GetFile_From_Mac_ATS_Name( const char*  fontName,
                                FSSpec*      pathSpec,
                                FT_Long*     face_index )
  {
#if __LP64__
    FT_UNUSED( fontName );
    FT_UNUSED( pathSpec );
    FT_UNUSED( face_index );

    return FT_Err_Unimplemented_Feature;
#else
    FSRef     ref;
    FT_Error  err;


    err = FT_GetFileRef_From_Mac_ATS_Name( fontName, &ref, face_index );
    if ( FT_Err_Ok != err )
      return err;

    if ( noErr != FSGetCatalogInfo( &ref, kFSCatInfoNone, NULL, NULL,
                                    pathSpec, NULL ) )
      return FT_Err_Unknown_File_Format;

    return FT_Err_Ok;
#endif
  }


  static OSErr
  FT_FSPathMakeRes( const UInt8*  pathname,
                    short*        res )
  {
    OSErr  err;
    FSRef  ref;


    if ( noErr != FSPathMakeRef( pathname, &ref, FALSE ) )
      return FT_Err_Cannot_Open_Resource;

    /* at present, no support for dfont format */
    err = FSOpenResourceFile( &ref, 0, NULL, fsRdPerm, res );
    if ( noErr == err )
      return err;

    /* fallback to original resource-fork font */
    *res = FSOpenResFile( &ref, fsRdPerm );
    err  = ResError();

    return err;
  }


  /* Return the file type for given pathname */
  static OSType
  get_file_type_from_path( const UInt8*  pathname )
  {
    FSRef          ref;
    FSCatalogInfo  info;


    if ( noErr != FSPathMakeRef( pathname, &ref, FALSE ) )
      return ( OSType ) 0;

    if ( noErr != FSGetCatalogInfo( &ref, kFSCatInfoFinderInfo, &info,
                                    NULL, NULL, NULL ) )
      return ( OSType ) 0;

    return ((FInfo *)(info.finderInfo))->fdType;
  }


  /* Given a PostScript font name, create the Macintosh LWFN file name. */
  static void
  create_lwfn_name( char*   ps_name,
                    Str255  lwfn_file_name )
  {
    int       max = 5, count = 0;
    FT_Byte*  p = lwfn_file_name;
    FT_Byte*  q = (FT_Byte*)ps_name;


    lwfn_file_name[0] = 0;

    while ( *q )
    {
      if ( ft_isupper( *q ) )
      {
        if ( count )
          max = 3;
        count = 0;
      }
      if ( count < max && ( ft_isalnum( *q ) || *q == '_' ) )
      {
        *++p = *q;
        lwfn_file_name[0]++;
        count++;
      }
      q++;
    }
  }


  static short
  count_faces_sfnt( char*  fond_data )
  {
    /* The count is 1 greater than the value in the FOND.  */
    /* Isn't that cute? :-)                                */

    return EndianS16_BtoN( *( (short*)( fond_data +
                                        sizeof ( FamRec ) ) ) ) + 1;
  }


  static short
  count_faces_scalable( char*  fond_data )
  {
    AsscEntry*  assoc;
    FamRec*     fond;
    short       i, face, face_all;


    fond     = (FamRec*)fond_data;
    face_all = EndianS16_BtoN( *( (short *)( fond_data +
                                             sizeof ( FamRec ) ) ) ) + 1;
    assoc    = (AsscEntry*)( fond_data + sizeof ( FamRec ) + 2 );
    face     = 0;

    for ( i = 0; i < face_all; i++ )
    {
      if ( 0 == EndianS16_BtoN( assoc[i].fontSize ) )
        face++;
    }
    return face;
  }


  /* Look inside the FOND data, answer whether there should be an SFNT
     resource, and answer the name of a possible LWFN Type 1 file.

     Thanks to Paul Miller (paulm@profoundeffects.com) for the fix
     to load a face OTHER than the first one in the FOND!
  */


  static void
  parse_fond( char*   fond_data,
              short*  have_sfnt,
              short*  sfnt_id,
              Str255  lwfn_file_name,
              short   face_index )
  {
    AsscEntry*  assoc;
    AsscEntry*  base_assoc;
    FamRec*     fond;


    *sfnt_id          = 0;
    *have_sfnt        = 0;
    lwfn_file_name[0] = 0;

    fond       = (FamRec*)fond_data;
    assoc      = (AsscEntry*)( fond_data + sizeof ( FamRec ) + 2 );
    base_assoc = assoc;

    /* Let's do a little range checking before we get too excited here */
    if ( face_index < count_faces_sfnt( fond_data ) )
    {
      assoc += face_index;        /* add on the face_index! */

      /* if the face at this index is not scalable,
         fall back to the first one (old behavior) */
      if ( EndianS16_BtoN( assoc->fontSize ) == 0 )
      {
        *have_sfnt = 1;
        *sfnt_id   = EndianS16_BtoN( assoc->fontID );
      }
      else if ( base_assoc->fontSize == 0 )
      {
        *have_sfnt = 1;
        *sfnt_id   = EndianS16_BtoN( base_assoc->fontID );
      }
    }

    if ( EndianS32_BtoN( fond->ffStylOff ) )
    {
      unsigned char*  p = (unsigned char*)fond_data;
      StyleTable*     style;
      unsigned short  string_count;
      char            ps_name[256];
      unsigned char*  names[64];
      int             i;


      p += EndianS32_BtoN( fond->ffStylOff );
      style = (StyleTable*)p;
      p += sizeof ( StyleTable );
      string_count = EndianS16_BtoN( *(short*)(p) );
      p += sizeof ( short );

      for ( i = 0; i < string_count && i < 64; i++ )
      {
        names[i] = p;
        p       += names[i][0];
        p++;
      }

      {
        size_t  ps_name_len = (size_t)names[0][0];


        if ( ps_name_len != 0 )
        {
          ft_memcpy(ps_name, names[0] + 1, ps_name_len);
          ps_name[ps_name_len] = 0;
        }
        if ( style->indexes[0] > 1 )
        {
          unsigned char*  suffixes = names[style->indexes[0] - 1];


          for ( i = 1; i <= suffixes[0]; i++ )
          {
            unsigned char*  s;
            size_t          j = suffixes[i] - 1;


            if ( j < string_count && ( s = names[j] ) != NULL )
            {
              size_t  s_len = (size_t)s[0];


              if ( s_len != 0 && ps_name_len + s_len < sizeof ( ps_name ) )
              {
                ft_memcpy( ps_name + ps_name_len, s + 1, s_len );
                ps_name_len += s_len;
                ps_name[ps_name_len] = 0;
              }
            }
          }
        }
      }

      create_lwfn_name( ps_name, lwfn_file_name );
    }
  }


  static  FT_Error
  lookup_lwfn_by_fond( const UInt8*      path_fond,
                       ConstStr255Param  base_lwfn,
                       UInt8*            path_lwfn,
                       size_t            path_size )
  {
    FSRef  ref, par_ref;
    int    dirname_len;


    /* Pathname for FSRef can be in various formats: HFS, HFS+, and POSIX. */
    /* We should not extract parent directory by string manipulation.      */

    if ( noErr != FSPathMakeRef( path_fond, &ref, FALSE ) )
      return FT_Err_Invalid_Argument;

    if ( noErr != FSGetCatalogInfo( &ref, kFSCatInfoNone,
                                    NULL, NULL, NULL, &par_ref ) )
      return FT_Err_Invalid_Argument;

    if ( noErr != FSRefMakePath( &par_ref, path_lwfn, path_size ) )
      return FT_Err_Invalid_Argument;

    if ( ft_strlen( (char *)path_lwfn ) + 1 + base_lwfn[0] > path_size )
      return FT_Err_Invalid_Argument;

    /* now we have absolute dirname in path_lwfn */
    ft_strcat( (char *)path_lwfn, "/" );
    dirname_len = ft_strlen( (char *)path_lwfn );
    ft_strcat( (char *)path_lwfn, (char *)base_lwfn + 1 );
    path_lwfn[dirname_len + base_lwfn[0]] = '\0';

    if ( noErr != FSPathMakeRef( path_lwfn, &ref, FALSE ) )
      return FT_Err_Cannot_Open_Resource;

    if ( noErr != FSGetCatalogInfo( &ref, kFSCatInfoNone,
                                    NULL, NULL, NULL, NULL ) )
      return FT_Err_Cannot_Open_Resource;

    return FT_Err_Ok;
  }


  static short
  count_faces( Handle        fond,
               const UInt8*  pathname )
  {
    short     sfnt_id;
    short     have_sfnt, have_lwfn;
    Str255    lwfn_file_name;
    UInt8     buff[HFS_MAXPATHLEN];
    FT_Error  err;
    short     num_faces;


    have_sfnt = have_lwfn = 0;

    parse_fond( *fond, &have_sfnt, &sfnt_id, lwfn_file_name, 0 );

    if ( lwfn_file_name[0] )
    {
      err = lookup_lwfn_by_fond( pathname, lwfn_file_name,
                                 buff, sizeof ( buff )  );
      if ( FT_Err_Ok == err )
        have_lwfn = 1;
    }

    if ( have_lwfn && ( !have_sfnt || PREFER_LWFN ) )
      num_faces = 1;
    else
      num_faces = count_faces_scalable( *fond );

    return num_faces;
  }


  /* Read Type 1 data from the POST resources inside the LWFN file,
     return a PFB buffer.  This is somewhat convoluted because the FT2
     PFB parser wants the ASCII header as one chunk, and the LWFN
     chunks are often not organized that way, so we glue chunks
     of the same type together. */
  static FT_Error
  read_lwfn( FT_Memory  memory,
             short      res,
             FT_Byte**  pfb_data,
             FT_ULong*  size )
  {
    FT_Error       error = FT_Err_Ok;
    short          res_id;
    unsigned char  *buffer, *p, *size_p = NULL;
    FT_ULong       total_size = 0;
    FT_ULong       old_total_size = 0;
    FT_ULong       post_size, pfb_chunk_size;
    Handle         post_data;
    char           code, last_code;


    UseResFile( res );

    /* First pass: load all POST resources, and determine the size of */
    /* the output buffer.                                             */
    res_id    = 501;
    last_code = -1;

    for (;;)
    {
      post_data = Get1Resource( 'POST', res_id++ );
      if ( post_data == NULL )
        break;  /* we are done */

      code = (*post_data)[0];

      if ( code != last_code )
      {
        if ( code == 5 )
          total_size += 2; /* just the end code */
        else
          total_size += 6; /* code + 4 bytes chunk length */
      }

      total_size += GetHandleSize( post_data ) - 2;
      last_code = code;

      /* detect integer overflows */
      if ( total_size < old_total_size )
      {
        error = FT_Err_Array_Too_Large;
        goto Error;
      }

      old_total_size = total_size;
    }

    if ( FT_ALLOC( buffer, (FT_Long)total_size ) )
      goto Error;

    /* Second pass: append all POST data to the buffer, add PFB fields. */
    /* Glue all consecutive chunks of the same type together.           */
    p              = buffer;
    res_id         = 501;
    last_code      = -1;
    pfb_chunk_size = 0;

    for (;;)
    {
      post_data = Get1Resource( 'POST', res_id++ );
      if ( post_data == NULL )
        break;  /* we are done */

      post_size = (FT_ULong)GetHandleSize( post_data ) - 2;
      code = (*post_data)[0];

      if ( code != last_code )
      {
        if ( last_code != -1 )
        {
          /* we are done adding a chunk, fill in the size field */
          if ( size_p != NULL )
          {
            *size_p++ = (FT_Byte)(   pfb_chunk_size         & 0xFF );
            *size_p++ = (FT_Byte)( ( pfb_chunk_size >> 8  ) & 0xFF );
            *size_p++ = (FT_Byte)( ( pfb_chunk_size >> 16 ) & 0xFF );
            *size_p++ = (FT_Byte)( ( pfb_chunk_size >> 24 ) & 0xFF );
          }
          pfb_chunk_size = 0;
        }

        *p++ = 0x80;
        if ( code == 5 )
          *p++ = 0x03;  /* the end */
        else if ( code == 2 )
          *p++ = 0x02;  /* binary segment */
        else
          *p++ = 0x01;  /* ASCII segment */

        if ( code != 5 )
        {
          size_p = p;   /* save for later */
          p += 4;       /* make space for size field */
        }
      }

      ft_memcpy( p, *post_data + 2, post_size );
      pfb_chunk_size += post_size;
      p += post_size;
      last_code = code;
    }

    *pfb_data = buffer;
    *size = total_size;

  Error:
    CloseResFile( res );
    return error;
  }


  /* Finalizer for a memory stream; gets called by FT_Done_Face().
     It frees the memory it uses. */
  static void
  memory_stream_close( FT_Stream  stream )
  {
    FT_Memory  memory = stream->memory;


    FT_FREE( stream->base );

    stream->size  = 0;
    stream->base  = 0;
    stream->close = 0;
  }


  /* Create a new memory stream from a buffer and a size. */
  static FT_Error
  new_memory_stream( FT_Library           library,
                     FT_Byte*             base,
                     FT_ULong             size,
                     FT_Stream_CloseFunc  close,
                     FT_Stream*           astream )
  {
    FT_Error   error;
    FT_Memory  memory;
    FT_Stream  stream;


    if ( !library )
      return FT_Err_Invalid_Library_Handle;

    if ( !base )
      return FT_Err_Invalid_Argument;

    *astream = 0;
    memory = library->memory;
    if ( FT_NEW( stream ) )
      goto Exit;

    FT_Stream_OpenMemory( stream, base, size );

    stream->close = close;

    *astream = stream;

  Exit:
    return error;
  }


  /* Create a new FT_Face given a buffer and a driver name. */
  static FT_Error
  open_face_from_buffer( FT_Library  library,
                         FT_Byte*    base,
                         FT_ULong    size,
                         FT_Long     face_index,
                         char*       driver_name,
                         FT_Face*    aface )
  {
    FT_Open_Args  args;
    FT_Error      error;
    FT_Stream     stream;
    FT_Memory     memory = library->memory;


    error = new_memory_stream( library,
                               base,
                               size,
                               memory_stream_close,
                               &stream );
    if ( error )
    {
      FT_FREE( base );
      return error;
    }

    args.flags  = FT_OPEN_STREAM;
    args.stream = stream;
    if ( driver_name )
    {
      args.flags  = args.flags | FT_OPEN_DRIVER;
      args.driver = FT_Get_Module( library, driver_name );
    }

    /* At this point, face_index has served its purpose;      */
    /* whoever calls this function has already used it to     */
    /* locate the correct font data.  We should not propagate */
    /* this index to FT_Open_Face() (unless it is negative).  */

    if ( face_index > 0 )
      face_index = 0;

    error = FT_Open_Face( library, &args, face_index, aface );
    if ( error == FT_Err_Ok )
      (*aface)->face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM;
    else
      FT_Stream_Free( stream, 0 );

    return error;
  }


  /* Create a new FT_Face from a file spec to an LWFN file. */
  static FT_Error
  FT_New_Face_From_LWFN( FT_Library    library,
                         const UInt8*  pathname,
                         FT_Long       face_index,
                         FT_Face*      aface )
  {
    FT_Byte*  pfb_data;
    FT_ULong  pfb_size;
    FT_Error  error;
    short     res;


    if ( noErr != FT_FSPathMakeRes( pathname, &res ) )
      return FT_Err_Cannot_Open_Resource;

    pfb_data = NULL;
    pfb_size = 0;
    error = read_lwfn( library->memory, res, &pfb_data, &pfb_size );
    CloseResFile( res ); /* PFB is already loaded, useless anymore */
    if ( error )
      return error;

    return open_face_from_buffer( library,
                                  pfb_data,
                                  pfb_size,
                                  face_index,
                                  "type1",
                                  aface );
  }


  /* Create a new FT_Face from an SFNT resource, specified by res ID. */
  static FT_Error
  FT_New_Face_From_SFNT( FT_Library  library,
                         short       sfnt_id,
                         FT_Long     face_index,
                         FT_Face*    aface )
  {
    Handle     sfnt = NULL;
    FT_Byte*   sfnt_data;
    size_t     sfnt_size;
    FT_Error   error  = FT_Err_Ok;
    FT_Memory  memory = library->memory;
    int        is_cff;


    sfnt = GetResource( 'sfnt', sfnt_id );
    if ( ResError() )
      return FT_Err_Invalid_Handle;

    sfnt_size = (FT_ULong)GetHandleSize( sfnt );
    if ( FT_ALLOC( sfnt_data, (FT_Long)sfnt_size ) )
    {
      ReleaseResource( sfnt );
      return error;
    }

    ft_memcpy( sfnt_data, *sfnt, sfnt_size );
    ReleaseResource( sfnt );

    is_cff = sfnt_size > 4 && sfnt_data[0] == 'O' &&
                              sfnt_data[1] == 'T' &&
                              sfnt_data[2] == 'T' &&
                              sfnt_data[3] == 'O';

    return open_face_from_buffer( library,
                                  sfnt_data,
                                  sfnt_size,
                                  face_index,
                                  is_cff ? "cff" : "truetype",
                                  aface );
  }


  /* Create a new FT_Face from a file spec to a suitcase file. */
  static FT_Error
  FT_New_Face_From_Suitcase( FT_Library    library,
                             const UInt8*  pathname,
                             FT_Long       face_index,
                             FT_Face*      aface )
  {
    FT_Error  error = FT_Err_Cannot_Open_Resource;
    short     res_ref, res_index;
    Handle    fond;
    short     num_faces_in_res, num_faces_in_fond;


    if ( noErr != FT_FSPathMakeRes( pathname, &res_ref ) )
      return FT_Err_Cannot_Open_Resource;

    UseResFile( res_ref );
    if ( ResError() )
      return FT_Err_Cannot_Open_Resource;

    num_faces_in_res = 0;
    for ( res_index = 1; ; ++res_index )
    {
      fond = Get1IndResource( 'FOND', res_index );
      if ( ResError() )
        break;

      num_faces_in_fond  = count_faces( fond, pathname );
      num_faces_in_res  += num_faces_in_fond;

      if ( 0 <= face_index && face_index < num_faces_in_fond && error )
        error = FT_New_Face_From_FOND( library, fond, face_index, aface );

      face_index -= num_faces_in_fond;
    }

    CloseResFile( res_ref );
    if ( FT_Err_Ok == error && NULL != aface )
      (*aface)->num_faces = num_faces_in_res;
    return error;
  }


  /* documentation is in ftmac.h */

  FT_EXPORT_DEF( FT_Error )
  FT_New_Face_From_FOND( FT_Library  library,
                         Handle      fond,
                         FT_Long     face_index,
                         FT_Face*    aface )
  {
    short     sfnt_id, have_sfnt, have_lwfn = 0;
    short     fond_id;
    OSType    fond_type;
    Str255    fond_name;
    Str255    lwfn_file_name;
    UInt8     path_lwfn[HFS_MAXPATHLEN];
    OSErr     err;
    FT_Error  error = FT_Err_Ok;


    GetResInfo( fond, &fond_id, &fond_type, fond_name );
    if ( ResError() != noErr || fond_type != 'FOND' )
      return FT_Err_Invalid_File_Format;

    parse_fond( *fond, &have_sfnt, &sfnt_id, lwfn_file_name, face_index );

    if ( lwfn_file_name[0] )
    {
      short  res;


      res = HomeResFile( fond );
      if ( noErr != ResError() )
        goto found_no_lwfn_file;

      {
        UInt8  path_fond[HFS_MAXPATHLEN];
        FSRef  ref;


        err = FSGetForkCBInfo( res, kFSInvalidVolumeRefNum,
                               NULL, NULL, NULL, &ref, NULL );
        if ( noErr != err )
          goto found_no_lwfn_file;

        err = FSRefMakePath( &ref, path_fond, sizeof ( path_fond ) );
        if ( noErr != err )
          goto found_no_lwfn_file;

        error = lookup_lwfn_by_fond( path_fond, lwfn_file_name,
                                     path_lwfn, sizeof ( path_lwfn ) );
        if ( FT_Err_Ok == error )
          have_lwfn = 1;
      }
    }

    if ( have_lwfn && ( !have_sfnt || PREFER_LWFN ) )
      error = FT_New_Face_From_LWFN( library,
                                     path_lwfn,
                                     face_index,
                                     aface );
    else
      error = FT_Err_Unknown_File_Format;

  found_no_lwfn_file:
    if ( have_sfnt && FT_Err_Ok != error )
      error = FT_New_Face_From_SFNT( library,
                                     sfnt_id,
                                     face_index,
                                     aface );

    return error;
  }


  /* Common function to load a new FT_Face from a resource file. */
  static FT_Error
  FT_New_Face_From_Resource( FT_Library    library,
                             const UInt8*  pathname,
                             FT_Long       face_index,
                             FT_Face*      aface )
  {
    OSType    file_type;
    FT_Error  error;


    /* LWFN is a (very) specific file format, check for it explicitly */
    file_type = get_file_type_from_path( pathname );
    if ( file_type == 'LWFN' )
      return FT_New_Face_From_LWFN( library, pathname, face_index, aface );

    /* Otherwise the file type doesn't matter (there are more than  */
    /* `FFIL' and `tfil').  Just try opening it as a font suitcase; */
    /* if it works, fine.                                           */

    error = FT_New_Face_From_Suitcase( library, pathname, face_index, aface );
    if ( error == 0 )
      return error;

    /* let it fall through to normal loader (.ttf, .otf, etc.); */
    /* we signal this by returning no error and no FT_Face      */
    *aface = NULL;
    return 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_New_Face                                                        */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This is the Mac-specific implementation of FT_New_Face.  In        */
  /*    addition to the standard FT_New_Face() functionality, it also      */
  /*    accepts pathnames to Mac suitcase files.  For further              */
  /*    documentation see the original FT_New_Face() in freetype.h.        */
  /*                                                                       */
  FT_EXPORT_DEF( FT_Error )
  FT_New_Face( FT_Library   library,
               const char*  pathname,
               FT_Long      face_index,
               FT_Face*     aface )
  {
    FT_Open_Args  args;
    FT_Error      error;


    /* test for valid `library' and `aface' delayed to FT_Open_Face() */
    if ( !pathname )
      return FT_Err_Invalid_Argument;

    error  = FT_Err_Ok;
    *aface = NULL;

    /* try resourcefork based font: LWFN, FFIL */
    error = FT_New_Face_From_Resource( library, (UInt8 *)pathname,
                                       face_index, aface );
    if ( error != 0 || *aface != NULL )
      return error;

    /* let it fall through to normal loader (.ttf, .otf, etc.) */
    args.flags    = FT_OPEN_PATHNAME;
    args.pathname = (char*)pathname;
    return FT_Open_Face( library, &args, face_index, aface );
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_New_Face_From_FSRef                                             */
  /*                                                                       */
  /* <Description>                                                         */
  /*    FT_New_Face_From_FSRef is identical to FT_New_Face except it       */
  /*    accepts an FSRef instead of a path.                                */
  /*                                                                       */
  FT_EXPORT_DEF( FT_Error )
  FT_New_Face_From_FSRef( FT_Library    library,
                          const FSRef*  ref,
                          FT_Long       face_index,
                          FT_Face*      aface )
  {
    FT_Error      error;
    FT_Open_Args  args;
    OSErr   err;
    UInt8   pathname[HFS_MAXPATHLEN];


    if ( !ref )
      return FT_Err_Invalid_Argument;

    err = FSRefMakePath( ref, pathname, sizeof ( pathname ) );
    if ( err )
      error = FT_Err_Cannot_Open_Resource;

    error = FT_New_Face_From_Resource( library, pathname, face_index, aface );
    if ( error != 0 || *aface != NULL )
      return error;

    /* fallback to datafork font */
    args.flags    = FT_OPEN_PATHNAME;
    args.pathname = (char*)pathname;
    return FT_Open_Face( library, &args, face_index, aface );
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_New_Face_From_FSSpec                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    FT_New_Face_From_FSSpec is identical to FT_New_Face except it      */
  /*    accepts an FSSpec instead of a path.                               */
  /*                                                                       */
  FT_EXPORT_DEF( FT_Error )
  FT_New_Face_From_FSSpec( FT_Library     library,
                           const FSSpec*  spec,
                           FT_Long        face_index,
                           FT_Face*       aface )
  {
#if __LP64__
    FT_UNUSED( library );
    FT_UNUSED( spec );
    FT_UNUSED( face_index );
    FT_UNUSED( aface );

    return FT_Err_Unimplemented_Feature;
#else
    FSRef  ref;


    if ( !spec || FSpMakeFSRef( spec, &ref ) != noErr )
      return FT_Err_Invalid_Argument;
    else
      return FT_New_Face_From_FSRef( library, &ref, face_index, aface );
#endif
  }


/* END */

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