1/* Copyright (C) 2015 Red Hat, Inc.
2   This file is part of elfutils.
3
4   This file is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3 of the License, or
7   (at your option) any later version.
8
9   elfutils is distributed in the hope that it will be useful, but
10   WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17#ifdef HAVE_CONFIG_H
18# include <config.h>
19#endif
20
21#include <assert.h>
22#include <sys/types.h>
23#include <sys/stat.h>
24#include <fcntl.h>
25#include <inttypes.h>
26
27#include ELFUTILS_HEADER(elf)
28#include ELFUTILS_HEADER(dwelf)
29#include <gelf.h>
30
31#include <stdio.h>
32#include <unistd.h>
33#include <string.h>
34
35int
36main (int argc, char *argv[])
37{
38  int result = 0;
39  int cnt;
40
41  elf_version (EV_CURRENT);
42
43  for (cnt = 1; cnt < argc; ++cnt)
44    {
45      int fd = open (argv[cnt], O_RDONLY);
46
47      Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
48      if (elf == NULL)
49	{
50	  printf ("%s not usable %s\n", argv[cnt], elf_errmsg (-1));
51	  result = 1;
52	  close (fd);
53	  continue;
54	}
55
56      size_t shdrstrndx;
57      if (elf_getshdrstrndx (elf, &shdrstrndx) == -1)
58	{
59	  printf ("elf_getshdrstrnd failed %s\n", elf_errmsg (-1));
60	  result = 1;
61	  close (fd);
62	  continue;
63	}
64
65      Elf_Scn *scn = NULL;
66      while ((scn = elf_nextscn (elf, scn)) != NULL)
67	{
68	  int idx = elf_ndxscn (scn);
69	  GElf_Shdr shdr;
70	  if (gelf_getshdr (scn, &shdr) == NULL)
71	    {
72	      printf ("gelf_getshdr failed: %s\n", elf_errmsg (-1));
73	      result = 1;
74	      break;
75	    }
76
77	  const char *sname = elf_strptr (elf, shdrstrndx, shdr.sh_name);
78	  if (sname == NULL)
79	    {
80	      printf ("couldn't get section name: %s\n", elf_errmsg (-1));
81	      result = 1;
82	      break;
83	    }
84
85	  if (strncmp(".zdebug", sname, strlen (".zdebug")) == 0)
86	    {
87	      ssize_t size;
88	      if ((size = dwelf_scn_gnu_compressed_size (scn)) == -1)
89		{
90		  printf ("dwelf_scn_gnu_compressed_size failed: %s\n",
91			  elf_errmsg (-1));
92		  result = 1;
93		  break;
94		}
95	      printf ("section %d: GNU Compressed size: %zx\n", idx, size);
96	    }
97	}
98
99      elf_end (elf);
100      close (fd);
101    }
102
103  return result;
104}
105