contrib/fuzz/bdiff.cc

tests: convert the `root` arg of matchmod.match() to local path separators

This fixes tests that broke with 8b1a9ba375e5, complaining that "X not under
root /repo".  The vast majority of real uses are to pass `repo.root`, which is
normalized by `wdirvfs.base` being set to the result of `os.path.realpath()`.

Failure to convert looks like this:

  --- c:/Users/Matt/hg/tests/test-match.py.out
  +++ c:/Users/Matt/hg/tests/test-match.py.err
  @@ -0,0 +1,48 @@
  +ERROR: testVisitchildrensetGlob (__main__.IncludeMatcherTests)
  +
  +Traceback (most recent call last):
  +  File "c:\Users\Matt\hg\tests\test-match.py", line 180, in testVisitchildrensetGlob
  +    m = matchmod.match(b'/repo', b'', include=[b'glob:dir/z*'])
  +  File "c:\Users\Matt\hg\mercurial\match.py", line 271, in match
  +    kindpats = normalize(include, b'glob', root, cwd, auditor, warn)
  +  File "c:\Users\Matt\hg\mercurial\match.py", line 322, in _donormalize
  +    pat = pathutil.canonpath(root, cwd, pat, auditor=auditor)
  +  File "c:\Users\Matt\hg\mercurial\pathutil.py", line 251, in canonpath
  +    _(b"%s not under root '%s'") % (myname, root), hint=hint
  +Abort: dir/z* not under root '/repo'
  +ERROR: testVisitdirGlob (__main__.IncludeMatcherTests)

Differential Revision: https://phab.mercurial-scm.org/D7724

/*
 * bdiff.cc - fuzzer harness for bdiff.c
 *
 * Copyright 2018, Google Inc.
 *
 * This software may be used and distributed according to the terms of
 * the GNU General Public License, incorporated herein by reference.
 */
#include <memory>
#include <stdlib.h>

#include "FuzzedDataProvider.h"

extern "C" {
#include "bdiff.h"

extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv)
{
	return 0;
}

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
	FuzzedDataProvider provider(Data, Size);
	std::string left = provider.ConsumeRandomLengthString(Size);
	std::string right = provider.ConsumeRemainingBytesAsString();

	struct bdiff_line *a, *b;
	int an = bdiff_splitlines(left.c_str(), left.size(), &a);
	int bn = bdiff_splitlines(right.c_str(), right.size(), &b);
	struct bdiff_hunk l;
	bdiff_diff(a, an, b, bn, &l);
	free(a);
	free(b);
	bdiff_freehunks(l.next);
	return 0; // Non-zero return values are reserved for future use.
}

} // extern "C"