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/format.h>
  21
  22 void float_copy(struct stream_pos *destp,
  23                 const struct format *fdest,
  24                 struct stream_pos *srcp,
  25                 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(destp, srcp, float_class);
  33         } else {
  34                 double v;
  35
  36                 v = fsrc->double_read(srcp, float_class);
  37                 fdest->double_write(destp, float_class, v);
  38         }
  39 }
  40
  41 void float_type_free(struct type_class_float *float_class)
  42 {
  43         integer_type_free(float_class->exp);
  44         integer_type_free(float_class->mantissa);
  45         integer_type_free(float_class->sign);
  46         g_free(float_class);
  47 }
  48
  49 static void _float_type_free(struct type_class *type_class)
  50 {
  51         struct type_class_float *float_class =
  52                 container_of(type_class, struct type_class_float, p);
  53         float_type_free(float_class);
  54 }
  55
  56 struct type_class_float *float_type_new(const char *name,
  57                                         size_t mantissa_len,
  58                                         size_t exp_len, int byte_order,
  59                                         size_t alignment)
  60 {
  61         struct type_class_float *float_class;
  62         struct type_class_integer *int_class;
  63         struct type_class *type_class;
  64         int ret;
  65
  66         float_class = g_new(struct type_class_float, 1);
  67         type_class = &float_class->p;
  68
  69         type_class->name = g_quark_from_string(name);
  70         type_class->alignment = alignment;
  71         type_class->copy = float_copy;
  72         type_class->free = _float_type_free;
  73         type_class->ref = 1;
  74         float_class->byte_order = byte_order;
  75
  76         float_class->sign = integer_type_new(NULL, 1,
  77                                              byte_order, false, 1);
  78         if (!float_class->mantissa)
  79                 goto error_sign;
  80         float_class->mantissa = integer_type_new(NULL, mantissa_len - 1,
  81                                                  byte_order, false, 1);
  82         if (!float_class->mantissa)
  83                 goto error_mantissa;
  84         float_class->exp = integer_type_new(NULL, exp_len,
  85                                             byte_order, true, 1);
  86         if (!float_class->exp)
  87                 goto error_exp;
  88
  89         if (float_class->p.name) {
  90                 ret = ctf_register_type(&float_class->p);
  91                 if (ret)
  92                         goto error_register;
  93         }
  94         return float_class;
  95
  96 error_register:
  97         integer_type_free(float_class->exp);
  98 error_exp:
  99         integer_type_free(float_class->mantissa);
 100 error_mantissa:
 101         integer_type_free(float_class->sign);
 102 error_sign:
 103         g_free(float_class);
 104         return NULL;
 105 }