1 /*
2 * Copyright (C) 2005 David Turner
3 * Copyright (C) 2015 The Qt Company Ltd
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
37 static 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
51 HB_INTERNAL void
_hb_close_stream(HB_Stream stream)52 _hb_close_stream( HB_Stream stream )
53 {
54 if (!stream)
55 return;
56 free(stream->base);
57 free(stream);
58 }
59
60
61 HB_INTERNAL HB_Int
_hb_stream_pos(HB_Stream stream)62 _hb_stream_pos( HB_Stream stream )
63 {
64 LOG(( "_hb_stream_pos() -> %ld\n", stream->pos ));
65 return stream->pos;
66 }
67
68
69 HB_INTERNAL HB_Error
_hb_stream_seek(HB_Stream stream,HB_UInt pos)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
84 HB_INTERNAL HB_Error
_hb_stream_frame_enter(HB_Stream stream,HB_UInt count)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
102 Exit:
103 LOG(( "_hb_stream_frame_enter(%ld) -> 0x%04X\n", count, error ));
104 return error;
105 }
106
107
108 HB_INTERNAL void
_hb_stream_frame_exit(HB_Stream stream)109 _hb_stream_frame_exit( HB_Stream stream )
110 {
111 stream->cursor = NULL;
112
113 LOG(( "_hb_stream_frame_exit()\n" ));
114 }
115