24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
-
+
-
-
-
-
-
+
+
+
+
-
-
-
-
+
-
-
+
-
-
+
-
+
-
-
+
+
-
-
-
-
-
-
-
-
-
-
+
-
-
+
-
-
-
-
-
-
-
-
-
-
+
-
-
-
-
-
-
-
-
-
+
-
+
+
|
#include <sys/types.h>
#import "OFStream.h"
/*!
* @brief A stream that supports seeking.
*
* @note If you want to subclass this, override lowlevelSeekToOffset:,
* @note If you want to subclass this, override
* lowlevelSeekForwardWithOffset: and lowlevelSeekToOffsetRelativeToEnd:,
* but nothing else, as they do the actual work. OFSeekableStream uses
* those and makes them work together with the caching of OFStream.
* If you override these methods without the lowlevel prefix, you
* <i>will</i> break caching, get broken results and seek to the wrong
* position!
*/
- (void)seekToOffset: (off_t)offset;
/*!
* @brief Seeks to the specified offset, relative to the current location.
*
* @param offset The offset relative to the current location
* @return The absolute offset
- (off_t)seekForwardWithOffset: (off_t)offset;
- (void)seekToOffset: (off_t)offset
whence: (int)whence;
/*!
* @brief Seeks to the specified offset, relative to the end of the stream.
*
* @param offset The offset relative to the end of the stream
* @return The absolute offset
*/
- (off_t)seekToOffsetRelativeToEnd: (off_t)offset;
*/
- (void)lowlevelSeekToOffset: (off_t)offset;
/*!
* @brief Seek the stream on the lowlevel.
*
* @warning Do not call this directly!
*
* Override this with this method with your actual seek implementation when
* subclassing!
*
* @param offset The offset to seek forward to
*/
- (off_t)lowlevelSeekForwardWithOffset: (off_t)offset;
/*!
* @brief Seek the stream on the lowlevel.
*
* @warning Do not call this directly!
*
* Override this with this method with your actual seek implementation when
* subclassing!
*
* @param offset The offset to seek to, relative to the end
- (off_t)lowlevelSeekToOffsetRelativeToEnd: (off_t)offset;
- (void)lowlevelSeekToOffset: (off_t)offset
whence: (int)whence;
@end
|