libsframe/testsuite/libsframe.decode/be-flipping.c

/* be-flipping.c -- Test for handling different endianness in libsframe.

   Copyright (C) 2022-2024 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>

#include "sframe-api.h"

/* DejaGnu should not use gnulib's vsnprintf replacement here.  */
#undef vsnprintf
#include <dejagnu.h>

/* SFrame info from the following source (1 fde 5 fres):
   static int cnt;
   extern void foo (void);

   int bar()
   {
     cnt++;
     if (cnt == 3)
       foo();
    return (cnt);
  }
  gcc -mbig-endian -Wa,--gsframe -c -O3 t.c
  objcopy --dump-section .sframe=DATA-BE t.o
 */
#define DATA	"DATA-BE"

int
main (void)
{
  sframe_decoder_ctx *dctx = NULL;
  uint32_t nfres, fsize;
  int32_t fstart;
  unsigned char finfo;
  int err = 0;
  FILE *fp;
  struct stat st;
  char *sf_buf;
  size_t sf_size;

#define TEST(name, cond)                                                      \
  do                                                                          \
    {                                                                         \
      if (cond)                                                               \
	pass (name);                                                          \
      else                                                                    \
	fail (name);                                                          \
    }                                                                         \
    while (0)

  /* Test setup.  */
  fp = fopen (DATA, "r");
  if (fp == NULL)
    goto setup_fail;
  if (fstat (fileno (fp), &st) < 0)
    {
      perror ("fstat");
      fclose (fp);
      goto setup_fail;
    }
  sf_buf = malloc (st.st_size);
  if (sf_buf == NULL)
    {
      perror ("malloc");
      goto setup_fail;
    }
  sf_size = fread (sf_buf, 1, st.st_size, fp);
  fclose (fp);
  if (sf_size == 0)
    {
      fprintf (stderr, "Decode: Read buffer failed\n");
      goto setup_fail;
    }

  /* Execute tests.  */

  /* Call to sframe_decode will endian flip the input buffer (big-endian) if
     the host running the test is a little-endian system.  This endian-flipped
     copy of the buffer is kept internally in dctx.  */
  dctx = sframe_decode (sf_buf, sf_size, &err);
  TEST ("be-flipping: Decoder setup", dctx != NULL);

  unsigned int fde_cnt = sframe_decoder_get_num_fidx (dctx);
  TEST ("be-flipping: Decoder FDE count", fde_cnt == 1);

  err = sframe_decoder_get_funcdesc (dctx, 0, &nfres, &fsize, &fstart, &finfo);
  TEST ("be-flipping: Decoder get FDE", err == 0);
  TEST ("be-flipping: Decoder FRE count", nfres == 5);

  free (sf_buf);
  sf_buf = NULL;
      
  sframe_decoder_free (&dctx);
  return 0;

setup_fail:
  sframe_decoder_free (&dctx);
  fail ("be-flipping: Test setup");
  return 1;
}