contrib/fuzz/bdiff.cc
author Martin von Zweigbergk <martinvonz@google.com>
Tue, 13 Feb 2018 14:15:29 -0800
changeset 36210 5c9bdfb32eac
parent 35670 2b9e2415f5b5
child 38173 fa0ddd5e8fff
permissions -rw-r--r--
manifest: add support for including directories outside narrowspec When using tree manifests and the client doesn't have a directory, we have two choices for what to do with "hg manifest" output: 1) ignore the directory, and 2) include the directory (not files within it). For "hg files", we decided to ignore the directories (and files) outside the narrowspec. If we choose to not include directories outside the narrowspec, then I think we should also make sure we don't include files outside the narrowspec. I also think we should add --outside-narrow flag (or other name). Thus, whichever way we go, I think we should have a way of displaying paths (files or directories) outside the narrowspec. For that we'll need to handle the 't' flag that narrowhg uses, and that's what this patch adds support for. Differential Revision: https://phab.mercurial-scm.org/D2235

/*
 * 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 <stdlib.h>

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

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
	if (!Size) {
		return 0;
	}
	// figure out a random point in [0, Size] to split our input.
	size_t split = Data[0] / 255.0 * Size;

	// left input to diff is data[1:split]
	const uint8_t *left = Data + 1;
	// which has len split-1
	size_t left_size = split - 1;
	// right starts at the next byte after left ends
	const uint8_t *right = left + left_size;
	size_t right_size = Size - split;

	struct bdiff_line *a, *b;
	int an = bdiff_splitlines((const char *)left, split - 1, &a);
	int bn = bdiff_splitlines((const char *)right, 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.
}

#ifdef HG_FUZZER_INCLUDE_MAIN
int main(int argc, char **argv)
{
	const char data[] = "asdf";
	return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
}
#endif

} // extern "C"