types/float.c

   1 /*
   2  * float.c
   3  *
   4  * BabelTrace - Float Type Converter
   5  *
   6  * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  */
  18
  19 #include <babeltrace/compiler.h>
  20 #include <babeltrace/types.h>
  21
  22 void float_copy(struct stream_pos *dest, const struct format *fdest,
  23                 struct stream_pos *src, const struct format *fsrc,
  24                 const struct type_class *type_class)
  25 {
  26         struct type_class_float *float_class =
  27                 container_of(type_class, struct type_class_float, p);
  28
  29         if (fsrc->float_copy == fdest->float_copy) {
  30                 fsrc->float_copy(dest, src, float_class);
  31         } else {
  32                 double v;
  33
  34                 v = fsrc->double_read(src, float_class);
  35                 fdest->double_write(dest, float_class, v);
  36         }
  37 }
  38
  39 void float_type_free(struct type_class_float *float_class)
  40 {
  41         integer_type_free(float_class->exp);
  42         integer_type_free(float_class->mantissa);
  43         integer_type_free(float_class->sign);
  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         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->sign = integer_type_new(NULL, 1,
  74                                              byte_order, false, 1);
  75         if (!float_class->mantissa)
  76                 goto error_sign;
  77         float_class->mantissa = integer_type_new(NULL, mantissa_len - 1,
  78                                                  byte_order, false, 1);
  79         if (!float_class->mantissa)
  80                 goto error_mantissa;
  81         float_class->exp = integer_type_new(NULL, exp_len,
  82                                             byte_order, true, 1);
  83         if (!float_class->exp)
  84                 goto error_exp;
  85
  86         if (float_class->p.name) {
  87                 ret = ctf_register_type(&float_class->p);
  88                 if (ret)
  89                         goto error_register;
  90         }
  91         return float_class;
  92
  93 error_register:
  94         integer_type_free(float_class->exp);
  95 error_exp:
  96         integer_type_free(float_class->mantissa);
  97 error_mantissa:
  98         integer_type_free(float_class->sign);
  99 error_sign:
 100         g_free(float_class);
 101         return NULL;
 102 }