formats/ctf/types/bitfield.c

   1 /*
   2  * Common Trace Format
   3  *
   4  * Bitfields read/write functions.
   5  *
   6  * Copyright (c) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <ctf/bitfield.h>
  24 #include <endian.h>
  25
  26 uint64_t ctf_bitfield_unsigned_read(const unsigned char *ptr,
  27                                     unsigned long start, unsigned long len,
  28                                     int byte_order)
  29 {
  30         uint64_t v;
  31
  32         if (byte_order == LITTLE_ENDIAN)
  33                 ctf_bitfield_read_le(ptr, start, len, &v);
  34         else
  35                 ctf_bitfield_read_be(ptr, start, len, &v);
  36         return v;
  37 }
  38
  39 int64_t ctf_bitfield_signed_read(const unsigned char *ptr,
  40                                  unsigned long start, unsigned long len,
  41                                  int byte_order)
  42 {
  43         int64_t v;
  44
  45         if (byte_order == LITTLE_ENDIAN)
  46                 ctf_bitfield_read_le(ptr, start, len, &v);
  47         else
  48                 ctf_bitfield_read_be(ptr, start, len, &v);
  49         return v;
  50 }
  51
  52 size_t ctf_bitfield_unsigned_write(unsigned char *ptr,
  53                                    unsigned long start, unsigned long len,
  54                                    int byte_order, uint64_t v)
  55 {
  56         if (!ptr)
  57                 goto end;
  58         if (byte_order == LITTLE_ENDIAN)
  59                 ctf_bitfield_write_le(ptr, start, len, v);
  60         else
  61                 ctf_bitfield_write_be(ptr, start, len, v);
  62 end:
  63         return len;
  64 }
  65
  66 size_t ctf_bitfield_signed_write(unsigned char *ptr,
  67                                  unsigned long start, unsigned long len,
  68                                  int byte_order, int64_t v)
  69 {
  70         if (!ptr)
  71                 goto end;
  72         if (byte_order == LITTLE_ENDIAN)
  73                 ctf_bitfield_write_le(ptr, start, len, v);
  74         else
  75                 ctf_bitfield_write_be(ptr, start, len, v);
  76 end:
  77         return len;
  78 }