Add ctf type loading, add integer and bitfield "copy"
[babeltrace.git] / types / bitfield.c
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1/*
2 * BabelTrace - Bitfield Type Converter
3 *
4 * Copyright (c) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 *
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.
10 *
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.
15 *
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
19 */
20
21#include <babeltrace/compiler.h>
22#include <stdint.h>
23
24/*
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).
28 */
29extern
30size_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);
33
34size_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)
37{
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;
41
42 if (!(int_class->p.alignment % CHAR_BIT)
43 && !(int_class->len % CHAR_BIT)
44 && !(bitfield_class->start_offset))
45 return integer_copy(dest, fdest, src, fsrc, type_class);
46
47 if (!int_class->signedness) {
48 uint64_t v;
49
50 v = fsrc->bitfield_unsigned_read(src,
51 bitfield_class->start_offset,
52 int_class->len,
53 int_class->byte_order);
54 return fdest->bitfield_unsigned_write(dest,
55 bitfield_class->start_offset,
56 int_class->len, int_class->byte_order,
57 v);
58 } else {
59 int64_t v;
60
61 v = fsrc->bitfield_signed_read(src,
62 bitfield_class->start_offset,
63 int_class->len,
64 int_class->byte_order);
65 return fdest->bitfield_signed_write(dest,
66 bitfield_class->start_offset,
67 int_class->len, int_class->byte_order,
68 v);
69 }
70}
71
72int bitfield_type_new(const char *name, size_t start_offset,
73 size_t len, int byte_order, int signedness)
74{
75 struct type_class_bitfield bitfield_class;
76 struct type_class_integer *int_class;
77 int ret;
78
79 /*
80 * Freed when type is unregistered.
81 */
82 bitfield_class = g_new(struct type_class_bitfield, 1);
83 int_class = &bitfield_class->p;
84 int_class->p.name = g_quark_from_string(name);
85 int_class->len = len;
86 int_class->byte_order = byte_order;
87 int_class->signedness = signedness;
88 bitfield_class->start_offset = start_offset;
89 ret = ctf_register_type(&int_class->p);
90 if (ret)
91 g_free(bitfield_class);
92 return ret;
93}
94
95/* TODO: bitfield_type_free */
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