types/integer.c

   1 /*
   2  * BabelTrace - Integer 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/align.h>
  23 #include <stdint.h>
  24
  25 size_t integer_copy(unsigned char *dest, const struct format *fdest,
  26                     const unsigned char *src, const struct format *fsrc,
  27                     const struct type_class *type_class)
  28 {
  29         struct type_class_integer *int_class =
  30                 container_of(type_class, struct type_class_integer, p);
  31
  32         if (fsrc->p.alignment)
  33                 src = PTR_ALIGN(src, fsrc->p.alignment / CHAR_BIT);
  34         if (fdest->p.alignment)
  35                 dest = PTR_ALIGN(dest, fdest->p.alignment / CHAR_BIT);
  36
  37         if (!int_class->signedness) {
  38                 uint64_t v;
  39
  40                 v = fsrc->uint_read(src, int_class->len, int_class->byte_order);
  41                 return fdest->uint_write(dest, int_class->len, int_class->byte_order, v);
  42         } else {
  43                 int64_t v;
  44
  45                 v = fsrc->int_read(src, int_class->len, int_class->byte_order);
  46                 return fdest->int_write(dest, int_class->len, int_class->byte_order, v);
  47         }
  48 }
  49
  50 struct type_class_integer *integer_type_new(const char *name,
  51                                             size_t start_offset,
  52                                             size_t len, int byte_order,
  53                                             int signedness,
  54                                             size_t alignment)
  55 {
  56         struct type_class_integer *int_class;
  57         int ret;
  58
  59         /*
  60          * Freed when type is unregistered.
  61          */
  62         int_class = g_new(struct type_class_integer, 1);
  63         int_class->p.name = g_quark_from_string(name);
  64         int_class->p.alignment = alignment;
  65         int_class->p.copy = integer_copy;
  66         int_class->len = len;
  67         int_class->byte_order = byte_order;
  68         int_class->signedness = signedness;
  69         if (int_class->p.name) {
  70                 ret = ctf_register_type(&int_class.p);
  71                 if (ret) {
  72                         g_free(int_class);
  73                         return NULL;
  74                 }
  75         }
  76         return int_class;
  77 }
  78
  79 void integer_type_free(struct type_class_integer *int_class)
  80 {
  81         if (!int_class->name)
  82                 g_free(int_class);
  83 }