third_party/harfbuzz/src/harfbuzz-stream-private.h

   1 /*
   2  * Copyright (C) 1998-2004  David Turner and Werner Lemberg
   3  * Copyright (C) 2006  Behdad Esfahbod
   4  *
   5  * This is part of HarfBuzz, an OpenType Layout engine library.
   6  *
   7  * Permission is hereby granted, without written agreement and without
   8  * license or royalty fees, to use, copy, modify, and distribute this
   9  * software and its documentation for any purpose, provided that the
  10  * above copyright notice and the following two paragraphs appear in
  11  * all copies of this software.
  12  *
  13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  17  * DAMAGE.
  18  *
  19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  24  */
  25
  26 #ifndef HARFBUZZ_STREAM_PRIVATE_H
  27 #define HARFBUZZ_STREAM_PRIVATE_H
  28
  29 #include "harfbuzz-impl.h"
  30 #include "harfbuzz-stream.h"
  31
  32 HB_BEGIN_HEADER
  33
  34 HB_INTERNAL void
  35 _hb_close_stream( HB_Stream stream );
  36
  37 HB_INTERNAL HB_Int
  38 _hb_stream_pos( HB_Stream stream );
  39
  40 HB_INTERNAL HB_Error
  41 _hb_stream_seek( HB_Stream stream,
  42                  HB_UInt   pos );
  43
  44 HB_INTERNAL HB_Error
  45 _hb_stream_frame_enter( HB_Stream stream,
  46                         HB_UInt   size );
  47
  48 HB_INTERNAL void
  49 _hb_stream_frame_exit( HB_Stream stream );
  50
  51 /* convenience macros */
  52
  53 #define  SET_ERR(c)   ( (error = (c)) != 0 )
  54
  55 #define  GOTO_Table(tag) (0)
  56 #define  FILE_Pos()      _hb_stream_pos( stream )
  57 #define  FILE_Seek(pos)  SET_ERR( _hb_stream_seek( stream, pos ) )
  58 #define  ACCESS_Frame(size)  SET_ERR( _hb_stream_frame_enter( stream, size ) )
  59 #define  FORGET_Frame()      _hb_stream_frame_exit( stream )
  60
  61 #define  GET_Byte()      (*stream->cursor++)
  62 #define  GET_Short()     (stream->cursor += 2, (HB_Short)( \
  63                                 (*(((HB_Byte*)stream->cursor)-2) << 8) | \
  64                                  *(((HB_Byte*)stream->cursor)-1) \
  65                          ))
  66 #define  GET_Long()      (stream->cursor += 4, (HB_Int)( \
  67                                 (*(((HB_Byte*)stream->cursor)-4) << 24) | \
  68                                 (*(((HB_Byte*)stream->cursor)-3) << 16) | \
  69                                 (*(((HB_Byte*)stream->cursor)-2) << 8) | \
  70                                  *(((HB_Byte*)stream->cursor)-1) \
  71                          ))
  72
  73
  74 #define  GET_Char()      ((HB_Char)GET_Byte())
  75 #define  GET_UShort()    ((HB_UShort)GET_Short())
  76 #define  GET_ULong()     ((HB_UInt)GET_Long())
  77 #define  GET_Tag4()      GET_ULong()
  78
  79 HB_END_HEADER
  80
  81 #endif /* HARFBUZZ_STREAM_PRIVATE_H */