2 * BabelTrace - Bitfield Type Converter
4 * Copyright (c) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <babeltrace/compiler.h>
25 * Shortcut to integer copy if we copy bit-aligned data with 0 start_offset.
26 * This skips the bitfield overhead when dealing with enumerations (which use
27 * the bitfield copy functions).
30 size_t integer_copy(unsigned char *dest
, const struct format
*fdest
,
31 const unsigned char *src
, const struct format
*fsrc
,
32 const struct type_class
*type_class
);
34 size_t bitfield_copy(unsigned char *dest
, const struct format
*fdest
,
35 const unsigned char *src
, const struct format
*fsrc
,
36 const struct type_class
*type_class
)
38 struct type_class_bitfield
*bitfield_class
=
39 container_of(type_class
, struct type_class_bitfield
, p
);
40 struct type_class_integer
*int_class
= &bitfield_class
->p
;
42 if (!(int_class
->p
.alignment
% CHAR_BIT
)
43 && !(int_class
->len
% CHAR_BIT
)
44 && !(bitfield_class
->start_offset
% CHAR_BIT
)) {
45 size_t offset
= bitfield_class
->start_offset
/ CHAR_BIT
;
48 return integer_copy(dest
, fdest
, src
, fsrc
, type_class
);
51 if (!int_class
->signedness
) {
54 v
= fsrc
->bitfield_unsigned_read(src
,
55 bitfield_class
->start_offset
,
57 int_class
->byte_order
);
58 return fdest
->bitfield_unsigned_write(dest
,
59 bitfield_class
->start_offset
,
60 int_class
->len
, int_class
->byte_order
,
65 v
= fsrc
->bitfield_signed_read(src
,
66 bitfield_class
->start_offset
,
68 int_class
->byte_order
);
69 return fdest
->bitfield_signed_write(dest
,
70 bitfield_class
->start_offset
,
71 int_class
->len
, int_class
->byte_order
,
76 int bitfield_type_new(const char *name
, size_t start_offset
,
77 size_t len
, int byte_order
, int signedness
)
79 struct type_class_bitfield bitfield_class
;
80 struct type_class_integer
*int_class
;
84 * Freed when type is unregistered.
86 bitfield_class
= g_new(struct type_class_bitfield
, 1);
87 int_class
= &bitfield_class
->p
;
88 int_class
->p
.name
= g_quark_from_string(name
);
90 int_class
->byte_order
= byte_order
;
91 int_class
->signedness
= signedness
;
92 bitfield_class
->start_offset
= start_offset
;
93 ret
= ctf_register_type(&int_class
->p
);
95 g_free(bitfield_class
);
99 /* TODO: bitfield_type_free */