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annotate contrib/fuzz/fuzzutil.cc @ 39878:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -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 }