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

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• Hash : e1339133
  Author :
  Date : 2020-06-08T13:31:55
  

  Make macros for header file names optional. We no longer have to take care of the 8.3 file name limit; this allows us (a) to introduce longer, meaningful file names, and (b) to avoid macro names in `#include' lines altogether since some compilers (most notably Visual C++) doesn't support this properly. */*: Replace #include FOO_H with #include <freetype/foo.h> or something similar. Also update the documentation.

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• src/cid/cidload.c

• /****************************************************************************
   *
   * cidload.c
   *
   *   CID-keyed Type1 font loader (body).
   *
   * Copyright (C) 1996-2020 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 <freetype/internal/ftdebug.h>
  #include FT_CONFIG_CONFIG_H
  #include <freetype/ftmm.h>
  #include <freetype/internal/t1types.h>
  #include <freetype/internal/psaux.h>
  
  #include "cidload.h"
  
  #include "ciderrs.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  cidload
  
  
    /* read a single offset */
    FT_LOCAL_DEF( FT_ULong )
    cid_get_offset( FT_Byte*  *start,
                    FT_Byte    offsize )
    {
      FT_ULong  result;
      FT_Byte*  p = *start;
  
  
      for ( result = 0; offsize > 0; offsize-- )
      {
        result <<= 8;
        result  |= *p++;
      }
  
      *start = p;
      return result;
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                    TYPE 1 SYMBOL PARSING                      *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
  
    static FT_Error
    cid_load_keyword( CID_Face        face,
                      CID_Loader*     loader,
                      const T1_Field  keyword )
    {
      FT_Error      error;
      CID_Parser*   parser = &loader->parser;
      FT_Byte*      object;
      void*         dummy_object;
      CID_FaceInfo  cid = &face->cid;
  
  
      /* if the keyword has a dedicated callback, call it */
      if ( keyword->type == T1_FIELD_TYPE_CALLBACK )
      {
        FT_TRACE4(( "  %s", keyword->ident ));
  
        keyword->reader( (FT_Face)face, parser );
        error = parser->root.error;
        goto Exit;
      }
  
      /* we must now compute the address of our target object */
      switch ( keyword->location )
      {
      case T1_FIELD_LOCATION_CID_INFO:
        object = (FT_Byte*)cid;
        break;
  
      case T1_FIELD_LOCATION_FONT_INFO:
        object = (FT_Byte*)&cid->font_info;
        break;
  
      case T1_FIELD_LOCATION_FONT_EXTRA:
        object = (FT_Byte*)&face->font_extra;
        break;
  
      case T1_FIELD_LOCATION_BBOX:
        object = (FT_Byte*)&cid->font_bbox;
        break;
  
      default:
        {
          CID_FaceDict  dict;
  
  
          if ( parser->num_dict < 0 || parser->num_dict >= cid->num_dicts )
          {
            FT_ERROR(( "cid_load_keyword: invalid use of `%s'\n",
                       keyword->ident ));
            error = FT_THROW( Syntax_Error );
            goto Exit;
          }
  
          dict = cid->font_dicts + parser->num_dict;
          switch ( keyword->location )
          {
          case T1_FIELD_LOCATION_PRIVATE:
            object = (FT_Byte*)&dict->private_dict;
            break;
  
          default:
            object = (FT_Byte*)dict;
          }
        }
      }
  
      FT_TRACE4(( "  %s", keyword->ident ));
  
      dummy_object = object;
  
      /* now, load the keyword data in the object's field(s) */
      if ( keyword->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
           keyword->type == T1_FIELD_TYPE_FIXED_ARRAY   )
        error = cid_parser_load_field_table( &loader->parser, keyword,
                                             &dummy_object );
      else
        error = cid_parser_load_field( &loader->parser,
                                       keyword, &dummy_object );
  
      FT_TRACE4(( "\n" ));
  
    Exit:
      return error;
    }
  
  
    FT_CALLBACK_DEF( void )
    cid_parse_font_matrix( CID_Face     face,
                           CID_Parser*  parser )
    {
      CID_FaceDict  dict;
      FT_Face       root = (FT_Face)&face->root;
      FT_Fixed      temp[6];
      FT_Fixed      temp_scale;
  
  
      if ( parser->num_dict >= 0 && parser->num_dict < face->cid.num_dicts )
      {
        FT_Matrix*  matrix;
        FT_Vector*  offset;
        FT_Int      result;
  
  
        dict   = face->cid.font_dicts + parser->num_dict;
        matrix = &dict->font_matrix;
        offset = &dict->font_offset;
  
        /* input is scaled by 1000 to accommodate default FontMatrix */
        result = cid_parser_to_fixed_array( parser, 6, temp, 3 );
  
        if ( result < 6 )
        {
          FT_ERROR(( "cid_parse_font_matrix: not enough matrix elements\n" ));
          goto Exit;
        }
  
        FT_TRACE4(( " [%f %f %f %f %f %f]\n",
                    (double)temp[0] / 65536 / 1000,
                    (double)temp[1] / 65536 / 1000,
                    (double)temp[2] / 65536 / 1000,
                    (double)temp[3] / 65536 / 1000,
                    (double)temp[4] / 65536 / 1000,
                    (double)temp[5] / 65536 / 1000 ));
  
        temp_scale = FT_ABS( temp[3] );
  
        if ( temp_scale == 0 )
        {
          FT_ERROR(( "cid_parse_font_matrix: invalid font matrix\n" ));
          goto Exit;
        }
  
        /* atypical case */
        if ( temp_scale != 0x10000L )
        {
          /* set units per EM based on FontMatrix values */
          root->units_per_EM = (FT_UShort)FT_DivFix( 1000, temp_scale );
  
          temp[0] = FT_DivFix( temp[0], temp_scale );
          temp[1] = FT_DivFix( temp[1], temp_scale );
          temp[2] = FT_DivFix( temp[2], temp_scale );
          temp[4] = FT_DivFix( temp[4], temp_scale );
          temp[5] = FT_DivFix( temp[5], temp_scale );
          temp[3] = temp[3] < 0 ? -0x10000L : 0x10000L;
        }
  
        matrix->xx = temp[0];
        matrix->yx = temp[1];
        matrix->xy = temp[2];
        matrix->yy = temp[3];
  
        if ( !FT_Matrix_Check( matrix ) )
        {
          FT_ERROR(( "t1_parse_font_matrix: invalid font matrix\n" ));
          parser->root.error = FT_THROW( Invalid_File_Format );
          goto Exit;
        }
  
        /* note that the font offsets are expressed in integer font units */
        offset->x  = temp[4] >> 16;
        offset->y  = temp[5] >> 16;
      }
  
    Exit:
      return;
    }
  
  
    FT_CALLBACK_DEF( void )
    parse_fd_array( CID_Face     face,
                    CID_Parser*  parser )
    {
      CID_FaceInfo  cid    = &face->cid;
      FT_Memory     memory = face->root.memory;
      FT_Stream     stream = parser->stream;
      FT_Error      error  = FT_Err_Ok;
      FT_Long       num_dicts;
  
  
      num_dicts = cid_parser_to_int( parser );
      if ( num_dicts < 0 )
      {
        FT_ERROR(( "parse_fd_array: invalid number of dictionaries\n" ));
        goto Exit;
      }
  
      FT_TRACE4(( " %d\n", num_dicts ));
  
      /*
       * A single entry in the FDArray must (at least) contain the following
       * structure elements.
       *
       *   %ADOBeginFontDict              18
       *   X dict begin                   13
       *     /FontMatrix [X X X X]        22
       *     /Private X dict begin        22
       *     end                           4
       *   end                             4
       *   %ADOEndFontDict                16
       *
       * This needs 18+13+22+22+4+4+16=99 bytes or more.  Normally, you also
       * need a `dup X' at the very beginning and a `put' at the end, so a
       * rough guess using 100 bytes as the minimum is justified.
       */
      if ( (FT_ULong)num_dicts > stream->size / 100 )
      {
        FT_TRACE0(( "parse_fd_array: adjusting FDArray size"
                    " (from %d to %d)\n",
                    num_dicts,
                    stream->size / 100 ));
        num_dicts = (FT_Long)( stream->size / 100 );
      }
  
      if ( !cid->font_dicts )
      {
        FT_Int  n;
  
  
        if ( FT_NEW_ARRAY( cid->font_dicts, num_dicts ) )
          goto Exit;
  
        cid->num_dicts = num_dicts;
  
        /* set some default values (the same as for Type 1 fonts) */
        for ( n = 0; n < cid->num_dicts; n++ )
        {
          CID_FaceDict  dict = cid->font_dicts + n;
  
  
          dict->private_dict.blue_shift       = 7;
          dict->private_dict.blue_fuzz        = 1;
          dict->private_dict.lenIV            = 4;
          dict->private_dict.expansion_factor = (FT_Fixed)( 0.06 * 0x10000L );
          dict->private_dict.blue_scale       = (FT_Fixed)(
                                                  0.039625 * 0x10000L * 1000 );
        }
      }
  
    Exit:
      return;
    }
  
  
    /* By mistake, `expansion_factor' appears both in PS_PrivateRec */
    /* and CID_FaceDictRec (both are public header files and can't  */
    /* changed).  We simply copy the value.                         */
  
    FT_CALLBACK_DEF( void )
    parse_expansion_factor( CID_Face     face,
                            CID_Parser*  parser )
    {
      CID_FaceDict  dict;
  
  
      if ( parser->num_dict >= 0 && parser->num_dict < face->cid.num_dicts )
      {
        dict = face->cid.font_dicts + parser->num_dict;
  
        dict->expansion_factor              = cid_parser_to_fixed( parser, 0 );
        dict->private_dict.expansion_factor = dict->expansion_factor;
  
        FT_TRACE4(( "%d\n", dict->expansion_factor ));
      }
  
      return;
    }
  
  
    /* By mistake, `CID_FaceDictRec' doesn't contain a field for the */
    /* `FontName' keyword.  FreeType doesn't need it, but it is nice */
    /* to catch it for producing better trace output.                */
  
    FT_CALLBACK_DEF( void )
    parse_font_name( CID_Face     face,
                     CID_Parser*  parser )
    {
  #ifdef FT_DEBUG_LEVEL_TRACE
      if ( parser->num_dict >= 0 && parser->num_dict < face->cid.num_dicts )
      {
        T1_TokenRec  token;
        FT_UInt      len;
  
  
        cid_parser_to_token( parser, &token );
  
        len = (FT_UInt)( token.limit - token.start );
        if ( len )
          FT_TRACE4(( " %.*s\n", len, token.start ));
        else
          FT_TRACE4(( " <no value>\n" ));
      }
  #else
      FT_UNUSED( face );
      FT_UNUSED( parser );
  #endif
  
      return;
    }
  
  
    static
    const T1_FieldRec  cid_field_records[] =
    {
  
  #include "cidtoken.h"
  
      T1_FIELD_CALLBACK( "FDArray",         parse_fd_array, 0 )
      T1_FIELD_CALLBACK( "FontMatrix",      cid_parse_font_matrix, 0 )
      T1_FIELD_CALLBACK( "ExpansionFactor", parse_expansion_factor, 0 )
      T1_FIELD_CALLBACK( "FontName",        parse_font_name, 0 )
  
      { 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0, 0 }
    };
  
  
    static FT_Error
    cid_parse_dict( CID_Face     face,
                    CID_Loader*  loader,
                    FT_Byte*     base,
                    FT_ULong     size )
    {
      CID_Parser*  parser = &loader->parser;
  
  
      parser->root.cursor = base;
      parser->root.limit  = base + size;
      parser->root.error  = FT_Err_Ok;
  
      {
        FT_Byte*  cur   = base;
        FT_Byte*  limit = cur + size;
  
  
        for (;;)
        {
          FT_Byte*  newlimit;
  
  
          parser->root.cursor = cur;
          cid_parser_skip_spaces( parser );
  
          if ( parser->root.cursor >= limit )
            newlimit = limit - 1 - 17;
          else
            newlimit = parser->root.cursor - 17;
  
          /* look for `%ADOBeginFontDict' */
          for ( ; cur < newlimit; cur++ )
          {
            if ( *cur == '%'                                            &&
                 ft_strncmp( (char*)cur, "%ADOBeginFontDict", 17 ) == 0 )
            {
              /* 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++;
  
  #ifdef FT_DEBUG_LEVEL_TRACE
                FT_TRACE4(( " FontDict %d", parser->num_dict ));
                if ( parser->num_dict > face->cid.num_dicts )
                  FT_TRACE4(( " (ignored)" ));
                FT_TRACE4(( "\n" ));
  #endif
              }
            }
          }
  
          cur = parser->root.cursor;
          /* no error can occur in cid_parser_skip_spaces */
          if ( cur >= limit )
            break;
  
          cid_parser_skip_PS_token( parser );
          if ( parser->root.cursor >= limit || parser->root.error )
            break;
  
          /* look for immediates */
          if ( *cur == '/' && cur + 2 < limit )
          {
            FT_UInt  len;
  
  
            cur++;
            len = (FT_UInt)( parser->root.cursor - cur );
  
            if ( len > 0 && len < 22 )
            {
              /* now compare the immediate name to the keyword table */
              T1_Field  keyword = (T1_Field)cid_field_records;
  
  
              for (;;)
              {
                FT_Byte*  name;
  
  
                name = (FT_Byte*)keyword->ident;
                if ( !name )
                  break;
  
                if ( cur[0] == name[0]                     &&
                     len == ft_strlen( (const char*)name ) )
                {
                  FT_UInt  n;
  
  
                  for ( n = 1; n < len; n++ )
                    if ( cur[n] != name[n] )
                      break;
  
                  if ( n >= len )
                  {
                    /* we found it - run the parsing callback */
                    parser->root.error = cid_load_keyword( face,
                                                           loader,
                                                           keyword );
                    if ( parser->root.error )
                      return parser->root.error;
                    break;
                  }
                }
                keyword++;
              }
            }
          }
  
          cur = parser->root.cursor;
        }
  
        if ( !face->cid.num_dicts )
        {
          FT_ERROR(( "cid_parse_dict: No font dictionary found\n" ));
          return FT_THROW( Invalid_File_Format );
        }
      }
  
      return parser->root.error;
    }
  
  
    /* read the subrmap and the subrs of each font dict */
    static FT_Error
    cid_read_subrs( CID_Face  face )
    {
      CID_FaceInfo   cid    = &face->cid;
      FT_Memory      memory = face->root.memory;
      FT_Stream      stream = face->cid_stream;
      FT_Error       error;
      FT_Int         n;
      CID_Subrs      subr;
      FT_UInt        max_offsets = 0;
      FT_ULong*      offsets = NULL;
      PSAux_Service  psaux = (PSAux_Service)face->psaux;
  
  
      if ( FT_NEW_ARRAY( face->subrs, cid->num_dicts ) )
        goto Exit;
  
      subr = face->subrs;
      for ( n = 0; n < cid->num_dicts; n++, subr++ )
      {
        CID_FaceDict  dict  = cid->font_dicts + n;
        FT_Int        lenIV = dict->private_dict.lenIV;
        FT_UInt       count, num_subrs = dict->num_subrs;
        FT_ULong      data_len;
        FT_Byte*      p;
  
  
        if ( !num_subrs )
          continue;
  
        /* reallocate offsets array if needed */
        if ( num_subrs + 1 > max_offsets )
        {
          FT_UInt  new_max = FT_PAD_CEIL( num_subrs + 1, 4 );
  
  
          if ( new_max <= max_offsets )
          {
            error = FT_THROW( Syntax_Error );
            goto Fail;
          }
  
          if ( FT_RENEW_ARRAY( offsets, max_offsets, new_max ) )
            goto Fail;
  
          max_offsets = new_max;
        }
  
        /* read the subrmap's offsets */
        if ( FT_STREAM_SEEK( cid->data_offset + dict->subrmap_offset )     ||
             FT_FRAME_ENTER( ( num_subrs + 1 ) * (FT_UInt)dict->sd_bytes ) )
          goto Fail;
  
        p = (FT_Byte*)stream->cursor;
        for ( count = 0; count <= num_subrs; count++ )
          offsets[count] = cid_get_offset( &p, (FT_Byte)dict->sd_bytes );
  
        FT_FRAME_EXIT();
  
        /* offsets must be ordered */
        for ( count = 1; count <= num_subrs; count++ )
          if ( offsets[count - 1] > offsets[count] )
          {
            FT_ERROR(( "cid_read_subrs: offsets are not ordered\n" ));
            error = FT_THROW( Invalid_File_Format );
            goto Fail;
          }
  
        if ( offsets[num_subrs] > stream->size - cid->data_offset )
        {
          FT_ERROR(( "cid_read_subrs: too large `subrs' offsets\n" ));
          error = FT_THROW( Invalid_File_Format );
          goto Fail;
        }
  
        /* now, compute the size of subrs charstrings, */
        /* allocate, and read them                     */
        data_len = offsets[num_subrs] - offsets[0];
  
        if ( FT_NEW_ARRAY( subr->code, num_subrs + 1 ) ||
             FT_ALLOC( subr->code[0], data_len )       )
          goto Fail;
  
        if ( FT_STREAM_SEEK( cid->data_offset + offsets[0] ) ||
             FT_STREAM_READ( subr->code[0], data_len )  )
          goto Fail;
  
        /* set up pointers */
        for ( count = 1; count <= num_subrs; count++ )
        {
          FT_ULong  len;
  
  
          len               = offsets[count] - offsets[count - 1];
          subr->code[count] = subr->code[count - 1] + len;
        }
  
        /* decrypt subroutines, but only if lenIV >= 0 */
        if ( lenIV >= 0 )
        {
          for ( count = 0; count < num_subrs; count++ )
          {
            FT_ULong  len;
  
  
            len = offsets[count + 1] - offsets[count];
            psaux->t1_decrypt( subr->code[count], len, 4330 );
          }
        }
  
        subr->num_subrs = (FT_Int)num_subrs;
      }
  
    Exit:
      FT_FREE( offsets );
      return error;
  
    Fail:
      if ( face->subrs )
      {
        for ( n = 0; n < cid->num_dicts; n++ )
        {
          if ( face->subrs[n].code )
            FT_FREE( face->subrs[n].code[0] );
  
          FT_FREE( face->subrs[n].code );
        }
        FT_FREE( face->subrs );
      }
      goto Exit;
    }
  
  
    static void
    cid_init_loader( CID_Loader*  loader,
                     CID_Face     face )
    {
      FT_UNUSED( face );
  
      FT_ZERO( loader );
    }
  
  
    static  void
    cid_done_loader( CID_Loader*  loader )
    {
      CID_Parser*  parser = &loader->parser;
  
  
      /* finalize parser */
      cid_parser_done( parser );
    }
  
  
    static FT_Error
    cid_hex_to_binary( FT_Byte*  data,
                       FT_ULong  data_len,
                       FT_ULong  offset,
                       CID_Face  face )
    {
      FT_Stream  stream = face->root.stream;
      FT_Error   error;
  
      FT_Byte    buffer[256];
      FT_Byte   *p, *plimit;
      FT_Byte   *d, *dlimit;
      FT_Byte    val;
  
      FT_Bool    upper_nibble, done;
  
  
      if ( FT_STREAM_SEEK( offset ) )
        goto Exit;
  
      d      = data;
      dlimit = d + data_len;
      p      = buffer;
      plimit = p;
  
      upper_nibble = 1;
      done         = 0;
  
      while ( d < dlimit )
      {
        if ( p >= plimit )
        {
          FT_ULong  oldpos = FT_STREAM_POS();
          FT_ULong  size   = stream->size - oldpos;
  
  
          if ( size == 0 )
          {
            error = FT_THROW( Syntax_Error );
            goto Exit;
          }
  
          if ( FT_STREAM_READ( buffer, 256 > size ? size : 256 ) )
            goto Exit;
          p      = buffer;
          plimit = p + FT_STREAM_POS() - oldpos;
        }
  
        if ( ft_isdigit( *p ) )
          val = (FT_Byte)( *p - '0' );
        else if ( *p >= 'a' && *p <= 'f' )
          val = (FT_Byte)( *p - 'a' + 10 );
        else if ( *p >= 'A' && *p <= 'F' )
          val = (FT_Byte)( *p - 'A' + 10 );
        else if ( *p == ' '  ||
                  *p == '\t' ||
                  *p == '\r' ||
                  *p == '\n' ||
                  *p == '\f' ||
                  *p == '\0' )
        {
          p++;
          continue;
        }
        else if ( *p == '>' )
        {
          val  = 0;
          done = 1;
        }
        else
        {
          error = FT_THROW( Syntax_Error );
          goto Exit;
        }
  
        if ( upper_nibble )
          *d = (FT_Byte)( val << 4 );
        else
        {
          *d = (FT_Byte)( *d + val );
          d++;
        }
  
        upper_nibble = (FT_Byte)( 1 - upper_nibble );
  
        if ( done )
          break;
  
        p++;
      }
  
      error = FT_Err_Ok;
  
    Exit:
      return error;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    cid_face_open( CID_Face  face,
                   FT_Int    face_index )
    {
      CID_Loader   loader;
      CID_Parser*  parser;
      FT_Memory    memory = face->root.memory;
      FT_Error     error;
      FT_Int       n;
  
      CID_FaceInfo  cid = &face->cid;
  
      FT_ULong  binary_length;
      FT_ULong  entry_len;
  
  
      cid_init_loader( &loader, face );
  
      parser = &loader.parser;
      error = cid_parser_new( parser, face->root.stream, face->root.memory,
                              (PSAux_Service)face->psaux );
      if ( error )
        goto Exit;
  
      error = cid_parse_dict( face, &loader,
                              parser->postscript,
                              parser->postscript_len );
      if ( error )
        goto Exit;
  
      if ( face_index < 0 )
        goto Exit;
  
      if ( FT_NEW( face->cid_stream ) )
        goto Exit;
  
      if ( parser->binary_length )
      {
        if ( parser->binary_length >
               face->root.stream->size - parser->data_offset )
        {
          FT_TRACE0(( "cid_face_open: adjusting length of binary data\n"
                      "               (from %d to %d bytes)\n",
                      parser->binary_length,
                      face->root.stream->size - parser->data_offset ));
          parser->binary_length = face->root.stream->size -
                                  parser->data_offset;
        }
  
        /* we must convert the data section from hexadecimal to binary */
        if ( FT_ALLOC( face->binary_data, parser->binary_length )    ||
             FT_SET_ERROR( cid_hex_to_binary( face->binary_data,
                                              parser->binary_length,
                                              parser->data_offset,
                                              face ) )               )
          goto Exit;
  
        FT_Stream_OpenMemory( face->cid_stream,
                              face->binary_data, parser->binary_length );
        cid->data_offset = 0;
      }
      else
      {
        *face->cid_stream = *face->root.stream;
        cid->data_offset  = loader.parser.data_offset;
      }
  
      /* sanity tests */
  
      if ( cid->fd_bytes < 0 || cid->gd_bytes < 1 )
      {
        FT_ERROR(( "cid_face_open:"
                   " Invalid `FDBytes' or `GDBytes' value\n" ));
        error = FT_THROW( Invalid_File_Format );
        goto Exit;
      }
  
      /* allow at most 32bit offsets */
      if ( cid->fd_bytes > 4 || cid->gd_bytes > 4 )
      {
        FT_ERROR(( "cid_face_open:"
                   " Values of `FDBytes' or `GDBytes' larger than 4\n"
                   "               "
                   " are not supported\n" ));
        error = FT_THROW( Invalid_File_Format );
        goto Exit;
      }
  
      binary_length = face->cid_stream->size - cid->data_offset;
      entry_len     = (FT_ULong)( cid->fd_bytes + cid->gd_bytes );
  
      for ( n = 0; n < cid->num_dicts; n++ )
      {
        CID_FaceDict  dict = cid->font_dicts + n;
  
  
        /* the upper limits are ad-hoc values */
        if ( dict->private_dict.blue_shift > 1000 ||
             dict->private_dict.blue_shift < 0    )
        {
          FT_TRACE2(( "cid_face_open:"
                      " setting unlikely BlueShift value %d to default (7)\n",
                      dict->private_dict.blue_shift ));
          dict->private_dict.blue_shift = 7;
        }
  
        if ( dict->private_dict.blue_fuzz > 1000 ||
             dict->private_dict.blue_fuzz < 0    )
        {
          FT_TRACE2(( "cid_face_open:"
                      " setting unlikely BlueFuzz value %d to default (1)\n",
                      dict->private_dict.blue_fuzz ));
          dict->private_dict.blue_fuzz = 1;
        }
  
        if ( dict->sd_bytes < 0                        ||
             ( dict->num_subrs && dict->sd_bytes < 1 ) )
        {
          FT_ERROR(( "cid_face_open: Invalid `SDBytes' value\n" ));
          error = FT_THROW( Invalid_File_Format );
          goto Exit;
        }
  
        if ( dict->sd_bytes > 4 )
        {
          FT_ERROR(( "cid_face_open:"
                     " Values of `SDBytes' larger than 4"
                     " are not supported\n" ));
          error = FT_THROW( Invalid_File_Format );
          goto Exit;
        }
  
        if ( dict->subrmap_offset > binary_length )
        {
          FT_ERROR(( "cid_face_open: Invalid `SubrMapOffset' value\n" ));
          error = FT_THROW( Invalid_File_Format );
          goto Exit;
        }
  
        /* `num_subrs' is scanned as a signed integer */
        if ( (FT_Int)dict->num_subrs < 0                                     ||
             ( dict->sd_bytes                                              &&
               dict->num_subrs > ( binary_length - dict->subrmap_offset ) /
                                   (FT_UInt)dict->sd_bytes                 ) )
        {
          FT_ERROR(( "cid_face_open: Invalid `SubrCount' value\n" ));
          error = FT_THROW( Invalid_File_Format );
          goto Exit;
        }
      }
  
      if ( cid->cidmap_offset > binary_length )
      {
        FT_ERROR(( "cid_face_open: Invalid `CIDMapOffset' value\n" ));
        error = FT_THROW( Invalid_File_Format );
        goto Exit;
      }
  
      if ( entry_len                                            &&
           cid->cid_count >
             ( binary_length - cid->cidmap_offset ) / entry_len )
      {
        FT_ERROR(( "cid_face_open: Invalid `CIDCount' value\n" ));
        error = FT_THROW( Invalid_File_Format );
        goto Exit;
      }
  
      /* we can now safely proceed */
      error = cid_read_subrs( face );
  
    Exit:
      cid_done_loader( &loader );
      return error;
    }
  
  
  /* END */
  

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