[ostree] tests: Add tests for rollsum

[Colin Walters <walters src gnome org>]

commit 863f5d85982af8e981c076846a50d335a6e5b630
Author: Giuseppe Scrivano <gscrivan redhat com>
Date:   Tue Aug 25 09:27:56 2015 -0400

    tests: Add tests for rollsum

 Makefile-tests.am    |    6 ++-
 tests/test-rollsum.c |  145 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 150 insertions(+), 1 deletions(-)
---
diff --git a/Makefile-tests.am b/Makefile-tests.am
index acfbe52..25bc7a0 100644
--- a/Makefile-tests.am
+++ b/Makefile-tests.am
@@ -129,7 +129,7 @@ noinst_PROGRAMS += tests/test-rollsum-cli
 
 TESTS = tests/test-varint tests/test-ot-unix-utils tests/test-bsdiff tests/test-mutable-tree \
        tests/test-keyfile-utils tests/test-ot-opt-utils tests/test-ot-tool-util \
-       tests/test-gpg-verify-result tests/test-checksum tests/test-lzma
+       tests/test-gpg-verify-result tests/test-checksum tests/test-lzma tests/test-rollsum
 
 check_PROGRAMS =  $(TESTS)
 TESTS_ENVIRONMENT = \
@@ -142,6 +142,10 @@ tests_test_rollsum_cli_SOURCES = src/libostree/ostree-rollsum.c tests/test-rolls
 tests_test_rollsum_cli_CFLAGS = $(TESTS_CFLAGS) $(OT_DEP_ZLIB_CFLAGS)
 tests_test_rollsum_cli_LDADD = libbupsplit.la $(TESTS_LDADD) $(OT_DEP_ZLIB_LIBS)
 
+tests_test_rollsum_SOURCES = src/libostree/ostree-rollsum.c tests/test-rollsum.c
+tests_test_rollsum_CFLAGS = $(TESTS_CFLAGS) $(OT_DEP_ZLIB_CFLAGS)
+tests_test_rollsum_LDADD = libbupsplit.la $(TESTS_LDADD) $(OT_DEP_ZLIB_LIBS)
+
 tests_test_mutable_tree_CFLAGS = $(TESTS_CFLAGS)
 tests_test_mutable_tree_LDADD = $(TESTS_LDADD)
 
diff --git a/tests/test-rollsum.c b/tests/test-rollsum.c
new file mode 100644
index 0000000..97aeb0a
--- /dev/null
+++ b/tests/test-rollsum.c
@@ -0,0 +1,145 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * This 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 of the License, or (at your option) any later version.
+ *
+ * This 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 this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "libglnx.h"
+#include "bsdiff/bsdiff.h"
+#include "bsdiff/bspatch.h"
+#include <glib.h>
+#include <stdlib.h>
+#include <gio/gio.h>
+#include <string.h>
+#include "ostree-rollsum.h"
+#include "bupsplit.h"
+
+static void
+test_rollsum_helper (const unsigned char *a, gsize size_a, const unsigned char *b, gsize size_b, gboolean 
expected_match)
+{
+  gsize i;
+  g_autoptr(GBytes) bytes_a = g_bytes_new_static (a, size_a);
+  g_autoptr(GBytes) bytes_b = g_bytes_new_static (b, size_b);
+  OstreeRollsumMatches *matches;
+  GPtrArray *matchlist;
+  guint64 sum_matched = 0;
+
+  matches = _ostree_compute_rollsum_matches (bytes_a, bytes_b);
+  matchlist = matches->matches;
+  if (expected_match)
+    g_assert_cmpint (matchlist->len, >, 0);
+  else
+    g_assert_cmpint (matchlist->len, ==, 0);
+
+  for (i = 0; i < matchlist->len; i++)
+    {
+      guint32 crc;
+      GVariant *match = matchlist->pdata[i];
+      guint64 offset = 0, to_start = 0, from_start = 0;
+      g_variant_get (match, "(uttt)", &crc, &offset, &to_start, &from_start);
+
+      g_assert_cmpint (offset, >=, 0);
+      g_assert_cmpint (from_start, <, size_a);
+      g_assert_cmpint (to_start, <, size_b);
+
+      sum_matched += offset;
+
+      g_assert_cmpint (memcmp (a + from_start, b + to_start, offset), ==, 0);
+    }
+
+  g_assert_cmpint (sum_matched, ==, matches->match_size);
+
+  _ostree_rollsum_matches_free (matches);
+}
+
+static void
+test_rollsum (void)
+{
+#define MAX_BUFFER_SIZE 1000000
+  gsize i;
+  int len;
+  unsigned char *a = malloc (MAX_BUFFER_SIZE);
+  unsigned char *b = malloc (MAX_BUFFER_SIZE);
+  g_autoptr(GRand) rand = g_rand_new ();
+
+  /* These two buffers produce the same crc32.  */
+  const unsigned char conflicting_a[] = {0x35, 0x9b, 0x94, 0x5a, 0xa0, 0x5a, 0x34, 0xdc, 0x5c, 0x3, 0x46, 
0xe, 0x34, 0x53, 0x85, 0x73, 0x64, 0xcc, 0x47, 0x10, 0x23, 0x8e, 0x7e, 0x6a, 0xca, 0xda, 0x7c, 0x12, 0x8a, 
0x59, 0x7f, 0x7f, 0x4d, 0x1, 0xd8, 0xcc, 0x81, 0xcf, 0x2c, 0x7f, 0x10, 0xc2, 0xb4, 0x40, 0x1f, 0x2a, 0x0, 
0x37, 0x85, 0xde, 0xfe, 0xa5, 0xc, 0x7c, 0xa1, 0x8, 0xd6, 0x75, 0xfd, 0x2, 0xcf, 0x2d, 0x53, 0x1b, 0x8a, 
0x6b, 0x35, 0xad, 0xa, 0x8f, 0xad, 0x2d, 0x91, 0x87, 0x2b, 0x97, 0xcf, 0x1d, 0x7c, 0x61, 0xc4, 0xb2, 0x5e, 
0xc3, 0xba, 0x5d, 0x2f, 0x3a, 0xeb, 0x41, 0x61, 0x4c, 0xa2, 0x34, 0xd, 0x43, 0xce, 0x10, 0xa3, 0x47, 0x4, 
0xa0, 0x39, 0x77, 0xc2, 0xe8, 0x36, 0x1d, 0x87, 0xd1, 0x8f, 0x4d, 0x13, 0xa1, 0x34, 0xc3, 0x2c, 0xee, 0x1a, 
0x10, 0x79, 0xb7, 0x97, 0x29, 0xe8, 0xf0, 0x5, 0xfc, 0xe6, 0x14, 0x87, 0x9c, 0x8f, 0x97, 0x23, 0xac, 0x1, 
0xf2, 0xee, 0x69, 0xb2, 0xe5};
+
+  const unsigned char conflicting_b[] = {0xb2, 0x54, 0x81, 0x7d, 0x31, 0x83, 0xc7, 0xc, 0xcf, 0x7d, 0x90, 
0x1c, 0x6b, 0xf6, 0x4e, 0xff, 0x49, 0xd1, 0xb6, 0xc, 0x9e, 0x85, 0xe3, 0x2d, 0xdb, 0x94, 0x8e, 0x1a, 0x17, 
0x3f, 0x63, 0x59, 0xf9, 0x4b, 0x5f, 0x47, 0x97, 0x9c, 0x1c, 0xd7, 0x24, 0xd9, 0x42, 0x6, 0x1e, 0xf, 0x98, 
0x10, 0xb4, 0xc, 0x50, 0xcb, 0xc5, 0x62, 0x53, 0x1, 0xd1, 0x5f, 0x16, 0x97, 0xaa, 0xd7, 0x57, 0x5e, 0xf2, 
0xde, 0xae, 0x53, 0x58, 0x6, 0xb7, 0x9b, 0x8d, 0x2b, 0xd6, 0xb4, 0x55, 0x29, 0x3b, 0x27, 0x70, 0xd5, 0xf3, 
0x8d, 0xdc, 0xad, 0x68, 0x63, 0xa5, 0x72, 0xce, 0x6b, 0x9, 0x2b, 0x60, 0x1b, 0x99, 0xd7, 0x86};
+
+    test_rollsum_helper (conflicting_a, sizeof conflicting_a, conflicting_b, sizeof conflicting_b, FALSE);
+
+    for (i = 0; i < MAX_BUFFER_SIZE; i++)
+    {
+      a[i] = g_rand_int (rand);
+      b[i] = a[i];
+    }
+  test_rollsum_helper (a, MAX_BUFFER_SIZE, b, MAX_BUFFER_SIZE, TRUE);
+
+  /* Do not overwrite the first buffer.  */
+  len = bupsplit_find_ofs (b, MAX_BUFFER_SIZE, NULL);
+  if (len)
+    {
+      unsigned char *ptr = b + len;
+      gsize remaining = MAX_BUFFER_SIZE - len;
+      while (remaining)
+        {
+          len = bupsplit_find_ofs (ptr, remaining, NULL);
+          if (len == 0)
+            break;
+          *ptr = ~(*ptr);
+          remaining -= len;
+          ptr += len;
+        }
+    }
+  test_rollsum_helper (a, MAX_BUFFER_SIZE, b, MAX_BUFFER_SIZE, TRUE);
+
+  /* Duplicate the first buffer.  */
+  len = bupsplit_find_ofs (b, MAX_BUFFER_SIZE, NULL);
+  if (len && len < MAX_BUFFER_SIZE / 2)
+    {
+      memcpy (b + len, b, len);
+    }
+  test_rollsum_helper (a, MAX_BUFFER_SIZE, b, MAX_BUFFER_SIZE, TRUE);
+
+  /* All different.  */
+  for (i = 0; i < MAX_BUFFER_SIZE; i++)
+    {
+      a[i] = g_rand_int (rand);
+      b[i] = a[i] + 1;
+    }
+  test_rollsum_helper (a, MAX_BUFFER_SIZE, b, MAX_BUFFER_SIZE, FALSE);
+
+  /* All different.  */
+  a[0] = g_rand_int (rand);
+  b[0] = a[0] + 1;
+  for (i = 1; i < MAX_BUFFER_SIZE; i++)
+    {
+      a[i] = g_rand_int (rand);
+      b[i] = g_rand_int (rand);
+    }
+  test_rollsum_helper (a, MAX_BUFFER_SIZE, b, MAX_BUFFER_SIZE, FALSE);
+}
+
+int main (int argc, char **argv)
+{
+  g_test_init (&argc, &argv, NULL);
+  g_test_add_func ("/rollsum", test_rollsum);
+  return g_test_run();
+}