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annotate contrib/fuzz/fuzzutil.cc @ 40788:41f0529b5112 stable

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commandserver: get around ETIMEDOUT raised by selectors2 selector.select() should exits with an empty event list on timed out, but selectors2 raises OSError if timeout expires while recovering from EINTR. Spotted while debugging new chg feature.
author Yuya Nishihara <yuya@tcha.org>
date Mon, 03 Dec 2018 21:45:15 +0900
parents a1c0873a9990
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }