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
32HB_BEGIN_HEADER
33
34HB_INTERNAL void
35_hb_close_stream( HB_Stream stream );
36
37HB_INTERNAL HB_Int
38_hb_stream_pos( HB_Stream stream );
39
40HB_INTERNAL HB_Error
41_hb_stream_seek( HB_Stream stream,
42                 HB_UInt   pos );
43
44HB_INTERNAL HB_Error
45_hb_stream_frame_enter( HB_Stream stream,
46                        HB_UInt   size );
47
48HB_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
79HB_END_HEADER
80
81#endif /* HARFBUZZ_STREAM_PRIVATE_H */
82