projects / babeltrace.git / blame
| Commit | Line | Data |
|---|---|---|
| 698f0fe4 MD |
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) | |
| 3c1bd98a MD |
44 | && !(bitfield_class->start_offset % CHAR_BIT)) { |
| 45 | size_t offset = bitfield_class->start_offset / CHAR_BIT; | |
| 46 | dest += offset; | |
| 47 | src += offset; | |
| 698f0fe4 | 48 | return integer_copy(dest, fdest, src, fsrc, type_class); |
| 3c1bd98a | 49 | } |
| 698f0fe4 MD |
50 | |
| 51 | if (!int_class->signedness) { | |
| 52 | uint64_t v; | |
| 53 | ||
| 54 | v = fsrc->bitfield_unsigned_read(src, | |
| 55 | bitfield_class->start_offset, | |
| 56 | int_class->len, | |
| 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, | |
| 61 | v); | |
| 62 | } else { | |
| 63 | int64_t v; | |
| 64 | ||
| 65 | v = fsrc->bitfield_signed_read(src, | |
| 66 | bitfield_class->start_offset, | |
| 67 | int_class->len, | |
| 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, | |
| 72 | v); | |
| 73 | } | |
| 74 | } | |
| 75 | ||
| 76 | int bitfield_type_new(const char *name, size_t start_offset, | |
| 77 | size_t len, int byte_order, int signedness) | |
| 78 | { | |
| 79 | struct type_class_bitfield bitfield_class; | |
| 80 | struct type_class_integer *int_class; | |
| 81 | int ret; | |
| 82 | ||
| 83 | /* | |
| 84 | * Freed when type is unregistered. | |
| 85 | */ | |
| 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); | |
| 89 | int_class->len = len; | |
| 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); | |
| 94 | if (ret) | |
| 95 | g_free(bitfield_class); | |
| 96 | return ret; | |
| 97 | } | |
| 98 | ||
| 99 | /* TODO: bitfield_type_free */ |