types/float.c

   1 /*
   2  * BabelTrace - Float 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
  24 size_t float_copy(unsigned char *dest, const struct format *fdest,
  25                   const unsigned char *src, const struct format *fsrc,
  26                   const struct type_class *type_class)
  27 {
  28         struct type_class_float *float_class =
  29                 container_of(type_class, struct type_class_float, p);
  30
  31         if (fsrc->float_copy == fdest->float_copy) {
  32                 fsrc->float_copy(dest, float_class, src, float_class);
  33                 return float_class->mantissa_len + float_class->exp_len;
  34         } else {
  35                 double v;
  36
  37                 v = fsrc->double_read(src, fsrc);
  38                 return fdest->double_write(dest, fdest, v);
  39         }
  40 }
  41
  42 void float_type_free(struct type_class_float *float_class)
  43 {
  44         g_free(float_class);
  45 }
  46
  47 static void _float_type_free(struct type_class *type_class)
  48 {
  49         struct type_class_float *float_class =
  50                 container_of(type_class, struct type_class_float, p);
  51         float_type_free(float_class);
  52 }
  53
  54 struct type_class_float *float_type_new(const char *name,
  55                                         size_t mantissa_len,
  56                                         size_t exp_len, int byte_order,
  57                                         size_t alignment)
  58 {
  59         struct type_class_float *float_class;
  60         int ret;
  61
  62         float_class = g_new(struct type_class_float, 1);
  63         float_class->p.name = g_quark_from_string(name);
  64         float_class->p.alignment = alignment;
  65         float_class->p.copy = float_copy;
  66         float_class->p.free = _float_type_free;
  67         float_class->mantissa_len = mantissa_len;
  68         float_class->exp_len = exp_len;
  69         float_class->byte_order = byte_order;
  70         if (float_class->p.name) {
  71                 ret = ctf_register_type(&float_class->p);
  72                 if (ret) {
  73                         g_free(float_class);
  74                         return NULL;
  75                 }
  76         }
  77         return float_class;
  78 }