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>
22 #include <babeltrace/types.h>
26 * Shortcut to integer copy if we copy bit-aligned data with 0 start_offset.
27 * This skips the bitfield overhead when dealing with enumerations (which use
28 * the bitfield copy functions).
31 size_t integer_copy(unsigned char *dest
, const struct format
*fdest
,
32 const unsigned char *src
, const struct format
*fsrc
,
33 const struct type_class
*type_class
);
35 size_t bitfield_copy(unsigned char *dest
, const struct format
*fdest
,
36 const unsigned char *src
, const struct format
*fsrc
,
37 const struct type_class
*type_class
)
39 struct type_class_bitfield
*bitfield_class
=
40 container_of(type_class
, struct type_class_bitfield
, p
);
41 struct type_class_integer
*int_class
= &bitfield_class
->p
;
43 if (!(int_class
->p
.alignment
% CHAR_BIT
)
44 && !(int_class
->len
% CHAR_BIT
)
45 && !(bitfield_class
->start_offset
% CHAR_BIT
)) {
46 size_t offset
= bitfield_class
->start_offset
/ CHAR_BIT
;
49 return integer_copy(dest
, fdest
, src
, fsrc
, type_class
);
52 if (!int_class
->signedness
) {
55 v
= fsrc
->bitfield_unsigned_read(src
,
56 bitfield_class
->start_offset
,
58 int_class
->byte_order
);
59 return fdest
->bitfield_unsigned_write(dest
,
60 bitfield_class
->start_offset
,
61 int_class
->len
, int_class
->byte_order
,
66 v
= fsrc
->bitfield_signed_read(src
,
67 bitfield_class
->start_offset
,
69 int_class
->byte_order
);
70 return fdest
->bitfield_signed_write(dest
,
71 bitfield_class
->start_offset
,
72 int_class
->len
, int_class
->byte_order
,
77 struct type_class_bitfield
*bitfield_type_new(const char *name
,
79 size_t len
, int byte_order
,
83 struct type_class_bitfield
*bitfield_class
;
84 struct type_class_integer
*int_class
;
87 bitfield_class
= g_new(struct type_class_bitfield
, 1);
88 int_class
= &bitfield_class
->p
;
89 int_class
->p
.name
= g_quark_from_string(name
);
90 int_class
->p
.alignment
= alignment
;
92 int_class
->byte_order
= byte_order
;
93 int_class
->signedness
= signedness
;
94 bitfield_class
->start_offset
= start_offset
;
95 if (int_class
->p
.name
) {
96 ret
= ctf_register_type(&int_class
->p
);
98 g_free(bitfield_class
);
102 return bitfield_class
;
105 void bitfield_type_free(struct type_class_bitfield
*bitfield_class
)
107 g_free(bitfield_class
);
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