Mercurial > hg
annotate contrib/fuzz/bdiff.cc @ 38173:fa0ddd5e8fff
fuzz: extract some common utilities and use modern C++ idioms
Alex Gaynor suggested we should probably copy the left and right sides
of diffs to new blocks so we can detect over-reads in the diffing
code, and I agree. Once I got into that, I realized we should do
things with C++17 idioms rather than keep using malloc() and
free(). This change is the result. I tried to split it more than this
and failed.
Everything still compiles and works in the oss-fuzz container, so I
think we can count on C++17 being available!
Differential Revision: https://phab.mercurial-scm.org/D3675
author | Augie Fackler <augie@google.com> |
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date | Sat, 28 Apr 2018 22:18:50 -0400 |
parents | 2b9e2415f5b5 |
children | dbc39f028c9f |
rev | line source |
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1 /* |
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2 * bdiff.cc - fuzzer harness for bdiff.c |
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3 * |
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4 * Copyright 2018, Google Inc. |
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5 * |
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6 * This software may be used and distributed according to the terms of |
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7 * the GNU General Public License, incorporated herein by reference. |
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8 */ |
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9 #include <memory> |
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10 #include <stdlib.h> |
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11 |
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12 #include "fuzzutil.h" |
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13 |
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14 extern "C" { |
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15 #include "bdiff.h" |
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16 |
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17 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) |
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18 { |
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19 auto maybe_inputs = SplitInputs(Data, Size); |
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20 if (!maybe_inputs) { |
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21 return 0; |
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22 } |
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23 auto inputs = std::move(maybe_inputs.value()); |
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24 |
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25 struct bdiff_line *a, *b; |
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26 int an = bdiff_splitlines(inputs.left.get(), inputs.left_size, &a); |
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27 int bn = bdiff_splitlines(inputs.right.get(), inputs.right_size, &b); |
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28 struct bdiff_hunk l; |
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29 bdiff_diff(a, an, b, bn, &l); |
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30 free(a); |
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31 free(b); |
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32 bdiff_freehunks(l.next); |
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33 return 0; // Non-zero return values are reserved for future use. |
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34 } |
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35 |
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36 #ifdef HG_FUZZER_INCLUDE_MAIN |
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37 int main(int argc, char **argv) |
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38 { |
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39 const char data[] = "asdf"; |
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40 return LLVMFuzzerTestOneInput((const uint8_t *)data, 4); |
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41 } |
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42 #endif |
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43 |
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44 } // extern "C" |