ftmac.c

一个Xpdf应用的例子

/***************************************************************************/
/*                                                                         */
/*  ftmac.c                                                                */
/*                                                                         */
/*    Mac FOND support.  Written by [e-mail].                    */
/*                                                                         */
/*  Copyright 1996-2001 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: although the FOND driver sets face->num_faces field to the
    number of available fonts, but the Type 1 driver sets it to 1 anyway.
    So this field is currently not reliable, and I don't see a clean way
    to  resolve that. The face_index argument translates to
      Get1IndResource( 'FOND', face_index + 1 );
    so clients should figure out the resource index of the FOND.
    (I'll try to provide some example code for this at some point.)


    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().
  */


#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_INTERNAL_STREAM_H
#include "truetype/ttobjs.h"
#include "type1/t1objs.h"

#include <Resources.h>
#include <Fonts.h>
#include <Errors.h>
#include <Files.h>
#include <TextUtils.h>

#include <ctype.h>  /* for isupper() and isalnum() */

#include FT_MAC_H


  /* 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


  /* Quick'n'dirty Pascal string to C string converter.
     Warning: this call is not thread safe! Use with caution. */
  static char*
  p2c_str( unsigned char*  pstr )
  {
    static char  cstr[256];


    strncpy( cstr, (char*)pstr + 1, pstr[0] );
    cstr[pstr[0]] = '\0';
    return cstr;
  }


  /* Given a pathname, fill in a file spec. */
  static int
  file_spec_from_path( const char*  pathname,
                       FSSpec*      spec )
  {
    Str255    p_path;
    FT_ULong  path_len;


    /* convert path to a pascal string */
    path_len = strlen( pathname );
    if ( path_len > 255 )
      return -1;
    p_path[0] = (unsigned char)path_len;
    strncpy( (char*)p_path + 1, pathname, path_len );

    if ( FSMakeFSSpec( 0, 0, p_path, spec ) != noErr )
      return -1;
    else
      return 0;
  }


  /* Return the file type of the file specified by spec. */
  static OSType
  get_file_type( FSSpec*  spec )
  {
    FInfo  finfo;


    if ( FSpGetFInfo( spec, &finfo ) != noErr )
      return 0;  /* file might not exist */

    return finfo.fdType;
  }


  /* is this a Mac OS X .dfont file */
  static Boolean
  is_dfont( FSSpec*  spec )
  {
    int nameLen = spec->name[0];


    if ( spec->name[nameLen - 5] == '.' &&
         spec->name[nameLen - 4] == 'd' &&
         spec->name[nameLen - 3] == 'f' &&
         spec->name[nameLen - 2] == 'o' &&
         spec->name[nameLen - 1] == 'n' &&
         spec->name[nameLen    ] == 't'  )
      return true;
    else
      return false;
  }


  /* 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 ( isupper( *q ) )
      {
        if ( count )
          max = 3;
        count = 0;
      }
      if ( count < max && ( isalnum( *q ) || *q == '_' ) )
      {
        *++p = *q;
        lwfn_file_name[0]++;
        count++;
      }
      q++;
    }
  }


  /* Given a file reference, answer its location as a vRefNum
     and a dirID. */
  static FT_Error
  get_file_location( short           ref_num,
                     short*          v_ref_num,
                     long*           dir_id,
                     unsigned char*  file_name )
  {
    FCBPBRec  pb;
    OSErr     error;

    pb.ioNamePtr = file_name;
    pb.ioVRefNum = 0;
    pb.ioRefNum  = ref_num;
    pb.ioFCBIndx = 0;


    error = PBGetFCBInfoSync( &pb );
    if ( error == noErr )
    {
      *v_ref_num = pb.ioFCBVRefNum;
      *dir_id    = pb.ioFCBParID;
    }
    return error;
  }


  /* Make a file spec for an LWFN file from a FOND resource and
     a file name. */
  static FT_Error
  make_lwfn_spec( Handle          fond,
                  unsigned char*  file_name,
                  FSSpec*         spec )
  {
    FT_Error  error;
    short     ref_num, v_ref_num;
    long      dir_id;
    Str255    fond_file_name;


    ref_num = HomeResFile( fond );

    error = ResError();
    if ( !error )
      error = get_file_location( ref_num, &v_ref_num,
                                 &dir_id, fond_file_name );
    if ( !error )
      error = FSMakeFSSpec( v_ref_num, dir_id, file_name, spec );

    return error;
  }


  /* 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 ([e-mail]) 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;
    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 ( assoc->fontSize == 0 )
    {
      *have_sfnt = 1;
      *sfnt_id   = assoc->fontID;
    }
    else if ( base_assoc->fontSize == 0 )
    {
      *have_sfnt = 1;
      *sfnt_id   = base_assoc->fontID;
    }

    if ( fond->ffStylOff )
    {
      unsigned char*  p = (unsigned char*)fond_data;
      StyleTable*     style;
      unsigned short  string_count;
      unsigned char*  name_table = 0;
      char            ps_name[256];
      unsigned char*  names[64];
      int             i;


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

      for ( i = 0 ; i < string_count && i < 64; i++ )
      {
        names[i] = p;
        p += names[i][0];
        p++;
      }
      strcpy( ps_name, p2c_str( names[0] ) );  /* Family name */

      if ( style->indexes[0] > 1 )
      {
        unsigned char*  suffixes = names[style->indexes[0] - 1];


        for ( i = 1; i <= suffixes[0]; i++ )
          strcat( ps_name, p2c_str( names[suffixes[i] - 1] ) );
      }
      create_lwfn_name( ps_name, lwfn_file_name );
    }
  }


  /* 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'll glue chunks
     of the same type together. */
  static FT_Error
  read_lwfn( FT_Memory  memory,
             FSSpec*    lwfn_spec,
             FT_Byte**  pfb_data,
             FT_ULong*  size )
  {
    FT_Error       error = FT_Err_Ok;
    short          res_ref, res_id;
    unsigned char  *buffer, *p, *size_p;
    FT_ULong       total_size = 0;
    FT_ULong       post_size, pfb_chunk_size;
    Handle         post_data;
    char           code, last_code;


    res_ref = FSpOpenResFile( lwfn_spec, fsRdPerm );
    if ( ResError() )
      return FT_Err_Out_Of_Memory;
    UseResFile( res_ref );

    /* 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're 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;
    }

    if ( 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're done */

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

      if ( code != last_code )
      {
        if ( last_code != -1 )
        {
          /* we're done adding a chunk, fill in the size field */
          *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 */
        }
      }

      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_ref );
    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;


    FREE( stream->base );

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