/* Check two binary blobs for equality.

   Copyright (C) 2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <support/check.h>

#include <support/support.h>

#include <support/xmemstream.h>

static void

report_length (const char *what, unsigned long int length, const char *expr)

{

  printf ("  %s %lu bytes (from %s)\n", what, length, expr);

}

static void

report_blob (const char *what, const unsigned char *blob,

             unsigned long int length, const char *expr)

{

  if (length > 0)

    {

      printf ("  %s (evaluated from %s):\n", what, expr);

      char *quoted = support_quote_blob (blob, length);

      printf ("      \"%s\"\n", quoted);

      free (quoted);

      fputs ("     ", stdout);

      for (unsigned long i = 0; i < length; ++i)

        printf (" %02X", blob[i]);

      putc ('\n', stdout);

    }

}

void

support_test_compare_blob (const void *left, unsigned long int left_length,

                           const void *right, unsigned long int right_length,

                           const char *file, int line,

                           const char *left_expr, const char *left_len_expr,

                           const char *right_expr, const char *right_len_expr)

{

  /* No differences are possible if both lengths are null.  */

  if (left_length == 0 && right_length == 0)

    return;

  if (left_length != right_length || left == NULL || right == NULL

      || memcmp (left, right, left_length) != 0)

    {

      support_record_failure ();

      printf ("%s:%d: error: blob comparison failed\n", file, line);

      if (left_length == right_length)

        printf ("  blob length: %lu bytes\n", left_length);

      else

        {

          report_length ("left length: ", left_length, left_len_expr);

          report_length ("right length:", right_length, right_len_expr);

        }

      report_blob ("left", left, left_length, left_expr);

      report_blob ("right", right, right_length, right_expr);

    }

}