types/bitfield.c

   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 <babeltrace/types.h>
  23 #include <stdint.h>
  24
  25 size_t bitfield_copy(struct stream_pos *dest, const struct format *fdest,
  26                      struct stream_pos *src, const struct format *fsrc,
  27                      const struct type_class *type_class)
  28 {
  29         struct type_class_bitfield *bitfield_class =
  30                 container_of(type_class, struct type_class_bitfield, p);
  31         struct type_class_integer *int_class = &bitfield_class->p;
  32
  33         if (!int_class->signedness) {
  34                 uint64_t v;
  35
  36                 v = fsrc->bitfield_unsigned_read(src, bitfield_class);
  37                 return fdest->bitfield_unsigned_write(dest, bitfield_class, v);
  38         } else {
  39                 int64_t v;
  40
  41                 v = fsrc->bitfield_signed_read(src, bitfield_class);
  42                 return fdest->bitfield_signed_write(dest, bitfield_class, v);
  43         }
  44 }
  45
  46 void bitfield_type_free(struct type_class_bitfield *bitfield_class)
  47 {
  48         g_free(bitfield_class);
  49 }
  50
  51 static void _bitfield_type_free(struct type_class *type_class)
  52 {
  53         struct type_class_bitfield *bitfield_class =
  54                 container_of(type_class, struct type_class_bitfield, p);
  55         bitfield_type_free(bitfield_class);
  56 }
  57
  58 struct type_class_bitfield *bitfield_type_new(const char *name,
  59                                               size_t len, int byte_order,
  60                                               int signedness,
  61                                               size_t alignment)
  62 {
  63         struct type_class_bitfield *bitfield_class;
  64         struct type_class_integer *int_class;
  65         int ret;
  66
  67         bitfield_class = g_new(struct type_class_bitfield, 1);
  68         int_class = &bitfield_class->p;
  69         int_class->p.name = g_quark_from_string(name);
  70         int_class->p.alignment = alignment;
  71         int_class->p.copy = bitfield_copy;
  72         int_class->p.free = _bitfield_type_free;
  73         int_class->len = len;
  74         int_class->byte_order = byte_order;
  75         int_class->signedness = signedness;
  76         if (int_class->p.name) {
  77                 ret = ctf_register_type(&int_class->p);
  78                 if (ret) {
  79                         g_free(bitfield_class);
  80                         return NULL;
  81                 }
  82         }
  83         return bitfield_class;
  84 }