1/*
2 * Copyright (C) 2005  David Turner
3 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
4 * Copyright (C) 2007  Red Hat, Inc.
5 *
6 * This is part of HarfBuzz, an OpenType Layout engine library.
7 *
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
13 *
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * DAMAGE.
19 *
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 *
26 * Red Hat Author(s): Behdad Esfahbod
27 */
28
29#include "harfbuzz-impl.h"
30#include "harfbuzz-stream-private.h"
31#include <stdlib.h>
32
33#if 0
34#include <stdio.h>
35#define  LOG(x)  _hb_log x
36
37static void
38_hb_log( const char*   format, ... )
39{
40  va_list  ap;
41
42  va_start( ap, format );
43  vfprintf( stderr, format, ap );
44  va_end( ap );
45}
46
47#else
48#define  LOG(x)  do {} while (0)
49#endif
50
51HB_INTERNAL void
52_hb_close_stream( HB_Stream stream )
53{
54  if (!stream)
55      return;
56  free(stream->base);
57  free(stream);
58}
59
60
61HB_INTERNAL HB_Int
62_hb_stream_pos( HB_Stream stream )
63{
64  LOG(( "_hb_stream_pos() -> %ld\n", stream->pos ));
65  return stream->pos;
66}
67
68
69HB_INTERNAL HB_Error
70_hb_stream_seek( HB_Stream stream,
71		 HB_UInt pos )
72{
73  HB_Error  error = (HB_Error)0;
74
75  stream->pos = pos;
76  if (pos > stream->size)
77      error = ERR(HB_Err_Read_Error);
78
79  LOG(( "_hb_stream_seek(%ld) -> 0x%04X\n", pos, error ));
80  return error;
81}
82
83
84HB_INTERNAL HB_Error
85_hb_stream_frame_enter( HB_Stream stream,
86			HB_UInt count )
87{
88  HB_Error  error = HB_Err_Ok;
89
90  /* check new position, watch for overflow */
91  if (HB_UNLIKELY (stream->pos + count > stream->size ||
92		   stream->pos + count < stream->pos))
93  {
94    error = ERR(HB_Err_Read_Error);
95    goto Exit;
96  }
97
98  /* set cursor */
99  stream->cursor = stream->base + stream->pos;
100  stream->pos   += count;
101
102Exit:
103  LOG(( "_hb_stream_frame_enter(%ld) -> 0x%04X\n", count, error ));
104  return error;
105}
106
107
108HB_INTERNAL void
109_hb_stream_frame_exit( HB_Stream stream )
110{
111  stream->cursor = NULL;
112
113  LOG(( "_hb_stream_frame_exit()\n" ));
114}
115