kc3-lang/freetype/src/cid/cidload.c

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• Hash : f9b8dec4
  Author :
  Date : 2000-06-16T19:34:52
  

  major reformatting of the modules source code in order to get rid of most of the basic types redefinitions (i.e. FT_Int instead of "FT_Int", etc..) The format-specific prefixs like "TT_", "T1_", "T2_" & 'CID_" are now only used in relevant structures.. fixed Werner's fix to t2gload.c :-) other small bug fixes

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• src/cid/cidload.c

• /***************************************************************************/
  /*                                                                         */
  /*  cidload.c                                                              */
  /*                                                                         */
  /*    CID-keyed Type1 font loader (body).                                  */
  /*                                                                         */
  /*  Copyright 1996-2000 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 <freetype/internal/ftdebug.h>
  #include <freetype/config/ftconfig.h>
  #include <freetype/ftmm.h>
  
  #include <freetype/internal/t1types.h>
  #include <freetype/internal/t1errors.h>
  #include <cidload.h>
  
  #include <stdio.h>
  #include <ctype.h>  /* for isspace(), isalnum() */
  
  
    /*************************************************************************/
    /*                                                                       */
    /* 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_cidload
  
  
   /* read a single offset */
    LOCAL_FUNC
    FT_Long  cid_get_offset( FT_Byte**  start,
                             FT_Byte    offsize )
    {
      FT_Long   result;
      FT_Byte*  p = *start;
  
  
      for ( result = 0; offsize > 0; offsize-- )
        result = ( result << 8 ) | *p++;
  
      *start = p;
      return result;
    }
  
  
    LOCAL_FUNC
    void  cid_decrypt( FT_Byte*   buffer,
                       FT_Int     length,
                       FT_UShort  seed )
    {
      while ( length > 0 )
      {
        FT_Byte  plain;
  
  
        plain     = ( *buffer ^ ( seed >> 8 ) );
        seed      = ( *buffer + seed ) * 52845 + 22719;
        *buffer++ = plain;
        length--;
      }
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                    TYPE 1 SYMBOL PARSING                      *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
  
    static
    FT_Error  cid_load_keyword( CID_Face             face,
                                CID_Loader*          loader,
                                const T1_Field_Rec*  keyword )
    {
      FT_Error    error;
      CID_Parser* parser = &loader->parser;
      FT_Byte*    object;
      CID_Info*   cid = &face->cid;
  
  
      /* if the keyword has a dedicated callback, call it */
      if ( keyword->type == t1_field_callback )
      {
        error = keyword->reader( face, parser );
        goto Exit;
      }
  
      /* we must now compute the address of our target object */
      switch ( keyword->location )
      {
      case t1_field_cid_info:
        object = (FT_Byte*)cid;
        break;
  
      case t1_field_font_info:
        object = (FT_Byte*)&cid->font_info;
        break;
  
      default:
        {
          CID_FontDict*  dict;
  
  
          if ( parser->num_dict < 0 )
          {
            FT_ERROR(( "cid_load_keyword: invalid use of `%s'!\n",
                       keyword->ident ));
            error = T1_Err_Syntax_Error;
            goto Exit;
          }
  
          dict = cid->font_dicts + parser->num_dict;
          switch ( keyword->location )
          {
          case t1_field_private:
            object = (FT_Byte*)&dict->private_dict;
            break;
  
          default:
            object = (FT_Byte*)dict;
          }
        }
      }
  
      /* now, load the keyword data in the object's field(s) */
      if ( keyword->type == t1_field_integer_array ||
           keyword->type == t1_field_fixed_array   )
        error = CID_Load_Field_Table( parser, keyword, object );
      else
        error = CID_Load_Field( parser, keyword, object );
  
    Exit:
      return error;
    }
  
  
    static
    FT_Error  parse_font_bbox( CID_Face     face,
                               CID_Parser*  parser )
    {
      FT_Short  temp[4];
      FT_BBox*  bbox = &face->cid.font_bbox;
  
  
      (void)CID_ToCoordArray( parser, 4, temp );
      bbox->xMin = temp[0];
      bbox->yMin = temp[1];
      bbox->xMax = temp[2];
      bbox->yMax = temp[3];
  
      return T1_Err_Ok;       /* this is a callback function; */
                              /* we must return an error code */
    }
  
  
    static
    FT_Error  parse_font_matrix( CID_Face     face,
                                 CID_Parser*  parser )
    {
      FT_Matrix*     matrix;
      CID_FontDict*  dict;
      FT_Fixed       temp[4];
  
  
      if ( parser->num_dict >= 0 )
      {
        dict   = face->cid.font_dicts + parser->num_dict;
        matrix = &dict->font_matrix;
  
        (void)CID_ToFixedArray( parser, 4, temp, 3 );
        matrix->xx = temp[0];
        matrix->yx = temp[1];
        matrix->xy = temp[2];
        matrix->yy = temp[3];
      }
  
      return T1_Err_Ok;       /* this is a callback function; */
                              /* we must return an error code */
    }
  
  
    static
    FT_Error  parse_fd_array( CID_Face     face,
                              CID_Parser*  parser )
    {
      CID_Info*  cid    = &face->cid;
      FT_Memory  memory = face->root.memory;
      FT_Error   error  = T1_Err_Ok;
      FT_Long    num_dicts;
  
  
      num_dicts = CID_ToInt( parser );
  
      if ( !cid->font_dicts )
      {
        FT_Int  n;
  
  
        if ( ALLOC_ARRAY( cid->font_dicts, num_dicts, CID_FontDict ) )
          goto Exit;
  
        cid->num_dicts = (FT_UInt)num_dicts;
  
        /* don't forget to set a few defaults */
        for ( n = 0; n < cid->num_dicts; n++ )
        {
          CID_FontDict*  dict = cid->font_dicts + n;
  
  
          /* default value for lenIV */
          dict->private_dict.lenIV = 4;
        }
      }
  
    Exit:
      return error;
    }
  
  
    static
    const T1_Field_Rec  t1_field_records[] =
    {
  #include <cidtokens.h>
      { 0, 0, 0, 0, 0, 0 }
    };
  
  
    static
    int  is_alpha( char  c )
    {
      return ( isalnum( c ) ||
               c == '.'     ||
               c == '_'     );
    }
  
  
    static
    void  skip_whitespace( CID_Parser*  parser )
    {
      FT_Byte*  cur = parser->cursor;
  
  
      while ( cur < parser->limit && isspace( *cur ) )
        cur++;
  
      parser->cursor = cur;
    }
  
  
    static
    FT_Error  parse_dict( CID_Face     face,
                          CID_Loader*  loader,
                          FT_Byte*     base,
                          FT_Long      size )
    {
      CID_Parser*  parser = &loader->parser;
  
  
      parser->cursor = base;
      parser->limit  = base + size;
      parser->error  = 0;
  
      {
        FT_Byte*  cur   = base;
        FT_Byte*  limit = cur + size;
  
  
        for ( ;cur < limit; cur++ )
        {
          /* look for `%ADOBeginFontDict' */
          if ( *cur == '%' && cur + 20 < limit &&
               strncmp( (char*)cur, "%ADOBeginFontDict", 17 ) == 0 )
          {
            cur += 17;
  
            /* if /FDArray was found, then cid->num_dicts is > 0, and */
            /* we can start increasing parser->num_dict               */
            if ( face->cid.num_dicts > 0 )
              parser->num_dict++;
          }
          /* look for immediates */
          else if ( *cur == '/' && cur + 2 < limit )
          {
            FT_Byte*  cur2;
            FT_Int    len;
  
  
            cur++;
  
            cur2 = cur;
            while ( cur2 < limit && is_alpha( *cur2 ) )
              cur2++;
  
            len = cur2 - cur;
            if ( len > 0 && len < 22 )
            {
              /* now, compare the immediate name to the keyword table */
              const T1_Field_Rec*  keyword = t1_field_records;
  
  
              for (;;)
              {
                FT_Byte*  name;
  
  
                name = (FT_Byte*)keyword->ident;
                if ( !name )
                  break;
  
                if ( cur[0] == name[0]                          &&
                     len == (FT_Int)strlen( (const char*)name ) )
                {
                  FT_Int  n;
  
  
                  for ( n = 1; n < len; n++ )
                    if ( cur[n] != name[n] )
                      break;
  
                  if ( n >= len )
                  {
                    /* we found it - run the parsing callback */
                    parser->cursor = cur2;
                    skip_whitespace( parser );
                    parser->error = cid_load_keyword( face, loader, keyword );
                    if ( parser->error )
                      return parser->error;
  
                    cur = parser->cursor;
                    break;
                  }
                }
                keyword++;
              }
            }
          }
        }
      }
      return parser->error;
    }
  
  
    /* read the subrmap and the subrs of each font dict */
    static
    FT_Error  cid_read_subrs( CID_Face  face )
    {
      CID_Info*   cid    = &face->cid;
      FT_Memory   memory = face->root.memory;
      FT_Stream   stream = face->root.stream;
      FT_Error    error;
      FT_UInt     n;
      CID_Subrs*  subr;
      FT_UInt     max_offsets = 0;
      FT_ULong*   offsets = 0;
  
  
      if ( ALLOC_ARRAY( face->subrs, cid->num_dicts, CID_Subrs ) )
        goto Exit;
  
      subr = face->subrs;
      for ( n = 0; n < cid->num_dicts; n++, subr++ )
      {
        CID_FontDict*  dict = cid->font_dicts + n;
        FT_UInt        count, num_subrs = dict->num_subrs;
        FT_ULong       data_len;
        FT_Byte*       p;
  
  
        /* reallocate offsets array if needed */
        if ( num_subrs + 1 > max_offsets )
        {
          FT_UInt  new_max = ( num_subrs + 1 + 3 ) & -4;
  
  
          if ( REALLOC_ARRAY( offsets, max_offsets, new_max, FT_ULong ) )
            goto Fail;
  
          max_offsets = new_max;
        }
  
        /* read the subrmap's offsets */
        if ( FILE_Seek( cid->data_offset + dict->subrmap_offset ) ||
             ACCESS_Frame( ( num_subrs + 1 ) * dict->sd_bytes )   )
          goto Fail;
  
        p = (FT_Byte*)stream->cursor;
        for ( count = 0; count <= num_subrs; count++ )
          offsets[count] = cid_get_offset( &p, dict->sd_bytes );
  
        FORGET_Frame();
  
        /* now, compute the size of subrs charstrings, */
        /* allocate, and read them                     */
        data_len = offsets[num_subrs] - offsets[0];
  
        if ( ALLOC_ARRAY( subr->code, num_subrs+1, FT_Byte* ) ||
             ALLOC( subr->code[0], data_len )                 )
          goto Fail;
  
        if ( FILE_Seek( cid->data_offset + offsets[0] ) ||
             FILE_Read( subr->code[0], data_len )  )
          goto Exit;
  
        /* set up pointers */
        for ( count = 1; count <= num_subrs; count++ )
        {
          FT_UInt  len;
  
  
          len               = offsets[count] - offsets[count - 1];
          subr->code[count] = subr->code[count - 1] + len;
        }
  
        /* decrypt subroutines */
        for ( count = 0; count < num_subrs; count++ )
        {
          FT_UInt  len;
  
  
          len = offsets[count + 1] - offsets[count];
          cid_decrypt( subr->code[count], len, 4330 );
        }
  
        subr->num_subrs = num_subrs;
      }
  
    Exit:
      FREE( offsets );
      return error;
  
    Fail:
      if ( face->subrs )
      {
        for ( n = 0; n < cid->num_dicts; n++ )
        {
          if ( face->subrs[n].code )
            FREE( face->subrs[n].code[0] );
  
          FREE( face->subrs[n].code );
        }
        FREE( face->subrs );
      }
      goto Exit;
    }
  
  
    static
    void t1_init_loader( CID_Loader*  loader,
                         CID_Face     face )
    {
      UNUSED(face);
  
      MEM_Set( loader, 0, sizeof ( *loader ) );
    }
  
  
    static
    void t1_done_loader( CID_Loader*  loader )
    {
      CID_Parser*  parser = &loader->parser;
  
  
      /* finalize parser */
      CID_Done_Parser( parser );
    }
  
  
    LOCAL_FUNC
    FT_Error  CID_Open_Face( CID_Face  face )
    {
      CID_Loader  loader;
      CID_Parser* parser;
      FT_Error   error;
  
  
      t1_init_loader( &loader, face );
  
      parser = &loader.parser;
      error = CID_New_Parser( parser, face->root.stream, face->root.memory );
      if ( error )
        goto Exit;
  
      error = parse_dict( face, &loader,
                          parser->postscript,
                          parser->postscript_len );
      if ( error )
        goto Exit;
  
      face->cid.data_offset = loader.parser.data_offset;
      error = cid_read_subrs( face );
  
    Exit:
      t1_done_loader( &loader );
      return error;
    }
  
  
  /* END */
  

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