1 #ifndef _BABELTRACE_CTF_TYPES_H
2 #define _BABELTRACE_CTF_TYPES_H
9 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
22 #include <babeltrace/types.h>
23 #include <sys/types.h>
34 off_t offset
; /* offset of the packet in the file, in bytes */
35 off_t data_offset
; /* offset of data within the packet */
36 size_t packet_size
; /* packet size, in bits */
37 size_t content_size
; /* content size, in bits */
41 * Always update ctf_stream_pos with ctf_move_pos and ctf_init_pos.
43 struct ctf_stream_pos
{
44 struct stream_pos parent
;
45 int fd
; /* backing file fd. -1 if unset. */
46 GArray
*packet_index
; /* contains struct packet_index */
47 int prot
; /* mmap protection */
48 int flags
; /* mmap flags */
50 /* Current position */
51 off_t mmap_offset
; /* mmap offset in the file, in bytes */
52 size_t packet_size
; /* current packet size, in bits */
53 size_t content_size
; /* current content size, in bits */
54 uint32_t *content_size_loc
; /* pointer to current content size */
55 char *base
; /* mmap base address */
56 ssize_t offset
; /* offset from base, in bits. -EOF for end of file. */
57 size_t cur_index
; /* current index in packet index */
59 int dummy
; /* dummy position, for length calculation */
63 struct ctf_stream_pos
*ctf_pos(struct stream_pos
*pos
)
65 return container_of(pos
, struct ctf_stream_pos
, parent
);
68 int ctf_integer_read(struct stream_pos
*pos
, struct definition
*definition
);
69 int ctf_integer_write(struct stream_pos
*pos
, struct definition
*definition
);
70 int ctf_float_read(struct stream_pos
*pos
, struct definition
*definition
);
71 int ctf_float_write(struct stream_pos
*pos
, struct definition
*definition
);
72 int ctf_string_read(struct stream_pos
*pos
, struct definition
*definition
);
73 int ctf_string_write(struct stream_pos
*pos
, struct definition
*definition
);
74 int ctf_enum_read(struct stream_pos
*pos
, struct definition
*definition
);
75 int ctf_enum_write(struct stream_pos
*pos
, struct definition
*definition
);
76 int ctf_struct_rw(struct stream_pos
*pos
, struct definition
*definition
);
77 int ctf_variant_rw(struct stream_pos
*pos
, struct definition
*definition
);
78 int ctf_array_rw(struct stream_pos
*pos
, struct definition
*definition
);
79 int ctf_sequence_rw(struct stream_pos
*pos
, struct definition
*definition
);
81 void ctf_move_pos_slow(struct ctf_stream_pos
*pos
, size_t offset
, int whence
);
83 void ctf_init_pos(struct ctf_stream_pos
*pos
, int fd
, int open_flags
);
84 void ctf_fini_pos(struct ctf_stream_pos
*pos
);
87 * move_pos - move position of a relative bit offset
89 * TODO: allow larger files by updating base too.
92 void ctf_move_pos(struct ctf_stream_pos
*pos
, size_t bit_offset
)
94 if (pos
->offset
== -EOF
)
98 if (((pos
->prot
== PROT_READ
)
99 && (pos
->offset
+ bit_offset
>= pos
->content_size
))
100 || ((pos
->prot
== PROT_WRITE
)
101 && (pos
->offset
+ bit_offset
>= pos
->packet_size
))) {
102 ctf_move_pos_slow(pos
, bit_offset
, SEEK_CUR
);
106 pos
->offset
+= bit_offset
;
110 * align_pos - align position on a bit offset (> 0)
112 * TODO: allow larger files by updating base too.
115 void ctf_align_pos(struct ctf_stream_pos
*pos
, size_t bit_offset
)
117 ctf_move_pos(pos
, offset_align(pos
->offset
, bit_offset
));
121 char *ctf_get_pos_addr(struct ctf_stream_pos
*pos
)
123 /* Only makes sense to get the address after aligning on CHAR_BIT */
124 assert(!(pos
->offset
% CHAR_BIT
));
125 return pos
->base
+ (pos
->offset
/ CHAR_BIT
);
129 void ctf_dummy_pos(struct ctf_stream_pos
*pos
, struct ctf_stream_pos
*dummy
)
131 memcpy(dummy
, pos
, sizeof(struct ctf_stream_pos
));
137 * Check if current packet can hold data.
138 * Returns 0 for success, negative error otherwise.
141 int ctf_pos_packet(struct ctf_stream_pos
*dummy
)
143 if (dummy
->offset
> dummy
->packet_size
)
149 void ctf_pos_pad_packet(struct ctf_stream_pos
*pos
)
151 ctf_move_pos(pos
, pos
->packet_size
- pos
->offset
);
155 int ctf_pos_access_ok(struct ctf_stream_pos
*pos
, size_t bit_len
)
157 if (pos
->offset
== -EOF
)
159 if (pos
->offset
+ bit_len
> pos
->packet_size
)
164 #endif /* _BABELTRACE_CTF_TYPES_H */
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