formats/ctf/types/sequence.c

   1 /*
   2  * Common Trace Format
   3  *
   4  * Sequence format access functions.
   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/ctf/types.h>
  20
  21 int ctf_sequence_read(struct stream_pos *ppos, struct definition *definition)
  22 {
  23         struct definition_sequence *sequence_definition =
  24                 container_of(definition, struct definition_sequence, p);
  25         struct declaration_sequence *sequence_declaration =
  26                 sequence_definition->declaration;
  27         struct declaration *elem = sequence_declaration->elem;
  28         struct ctf_stream_pos *pos = ctf_pos(ppos);
  29
  30         if (elem->id == CTF_TYPE_INTEGER) {
  31                 struct declaration_integer *integer_declaration =
  32                         container_of(elem, struct declaration_integer, p);
  33
  34                 if (integer_declaration->encoding == CTF_STRING_UTF8
  35                       || integer_declaration->encoding == CTF_STRING_ASCII) {
  36
  37                         if (integer_declaration->len == CHAR_BIT
  38                             && integer_declaration->p.alignment == CHAR_BIT) {
  39                                 uint64_t len = sequence_len(sequence_definition);
  40
  41                                 ctf_align_pos(pos, integer_declaration->p.alignment);
  42                                 if (!ctf_pos_access_ok(pos, len * CHAR_BIT))
  43                                         return -EFAULT;
  44
  45                                 g_string_assign(sequence_definition->string, "");
  46                                 g_string_insert_len(sequence_definition->string,
  47                                         0, (char *) ctf_get_pos_addr(pos), len);
  48                                 ctf_move_pos(pos, len * CHAR_BIT);
  49                                 return 0;
  50                         }
  51                 }
  52         }
  53         return sequence_rw(ppos, definition);
  54 }
  55
  56 int ctf_sequence_write(struct stream_pos *ppos, struct definition *definition)
  57 {
  58         struct definition_sequence *sequence_definition =
  59                 container_of(definition, struct definition_sequence, p);
  60         struct declaration_sequence *sequence_declaration =
  61                 sequence_definition->declaration;
  62         struct declaration *elem = sequence_declaration->elem;
  63         struct ctf_stream_pos *pos = ctf_pos(ppos);
  64
  65         if (elem->id == CTF_TYPE_INTEGER) {
  66                 struct declaration_integer *integer_declaration =
  67                         container_of(elem, struct declaration_integer, p);
  68
  69                 if (integer_declaration->encoding == CTF_STRING_UTF8
  70                       || integer_declaration->encoding == CTF_STRING_ASCII) {
  71
  72                         if (integer_declaration->len == CHAR_BIT
  73                             && integer_declaration->p.alignment == CHAR_BIT) {
  74                                 uint64_t len = sequence_len(sequence_definition);
  75
  76                                 ctf_align_pos(pos, integer_declaration->p.alignment);
  77                                 if (!ctf_pos_access_ok(pos, len * CHAR_BIT))
  78                                         return -EFAULT;
  79
  80                                 memcpy((char *) ctf_get_pos_addr(pos),
  81                                         sequence_definition->string->str, len);
  82                                 ctf_move_pos(pos, len * CHAR_BIT);
  83                                 return 0;
  84                         }
  85                 }
  86         }
  87         return sequence_rw(ppos, definition);
  88 }