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annotate contrib/fuzz/fuzzutil.cc @ 39538:154e4f84b51c

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treemanifest: use visitchildrenset when filtering a manifest to a matcher Differential Revision: https://phab.mercurial-scm.org/D4370
author Kyle Lippincott <spectral@google.com>
date Thu, 23 Aug 2018 00:44:10 -0700
parents a1c0873a9990
children
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1 #include "fuzzutil.h"
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2
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3 #include <cstring>
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4 #include <utility>
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5
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6 contrib::optional<two_inputs> SplitInputs(const uint8_t *Data, size_t Size)
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7 {
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8 if (!Size) {
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9 return contrib::nullopt;
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10 }
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11 // figure out a random point in [0, Size] to split our input.
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12 size_t left_size = (Data[0] / 255.0) * (Size - 1);
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13
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14 // Copy inputs to new allocations so if bdiff over-reads
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15 // AddressSanitizer can detect it.
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16 std::unique_ptr<char[]> left(new char[left_size]);
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17 std::memcpy(left.get(), Data + 1, left_size);
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18 // right starts at the next byte after left ends
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19 size_t right_size = Size - (left_size + 1);
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20 std::unique_ptr<char[]> right(new char[right_size]);
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21 std::memcpy(right.get(), Data + 1 + left_size, right_size);
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22 LOG(2) << "inputs are " << left_size << " and " << right_size
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23 << " bytes" << std::endl;
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24 two_inputs result = {std::move(right), right_size, std::move(left),
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25 left_size};
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26 return result;
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27 }