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 void float_copy(struct stream_pos *dest, const struct format *fdest,
  25                 struct stream_pos *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         } else {
  34                 double v;
  35
  36                 v = fsrc->double_read(src, fsrc);
  37                 fdest->double_write(dest, fdest, v);
  38         }
  39 }
  40
  41 void float_type_free(struct type_class_float *float_class)
  42 {
  43         g_free(float_class);
  44 }
  45
  46 static void _float_type_free(struct type_class *type_class)
  47 {
  48         struct type_class_float *float_class =
  49                 container_of(type_class, struct type_class_float, p);
  50         float_type_free(float_class);
  51 }
  52
  53 struct type_class_float *float_type_new(const char *name,
  54                                         size_t mantissa_len,
  55                                         size_t exp_len, int byte_order,
  56                                         size_t alignment)
  57 {
  58         struct type_class_float *float_class;
  59         struct type_class_bitfield *bitfield_class;
  60         struct type_class_integer *int_class;
  61         struct type_class *type_class;
  62         int ret;
  63
  64         float_class = g_new(struct type_class_float, 1);
  65         type_class = &float_class->p;
  66
  67         type_class->name = g_quark_from_string(name);
  68         type_class->alignment = alignment;
  69         type_class->copy = float_copy;
  70         type_class->free = _float_type_free;
  71         float_class->byte_order = byte_order;
  72
  73         float_class->mantissa = bitfield_type_new(NULL, mantissa_len,
  74                                                   byte_order, false, 1);
  75         if (!float_class->mantissa)
  76                 goto error_mantissa;
  77         float_class->exp = bitfield_type_new(NULL, exp_len,
  78                                              byte_order, true, 1);
  79         if (!float_class->exp)
  80                 goto error_exp;
  81
  82         if (float_class->p.name) {
  83                 ret = ctf_register_type(&float_class->p);
  84                 if (ret)
  85                         goto error_register;
  86         }
  87         return float_class;
  88
  89 error_register:
  90         bitfield_type_free(float_class->exp);
  91 error_exp:
  92         bitfield_type_free(float_class->mantissa);
  93 error_mantissa:
  94         g_free(float_class);
  95         return NULL;
  96 }