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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 | */ | |
29 | extern | |
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); | |
33 | ||
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) | |
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 | ||
72 | int 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 */ |