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Improve parse_ubjson_fuzzer #2182

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Jun 12, 2020
Merged

Improve parse_ubjson_fuzzer #2182

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22 changes: 19 additions & 3 deletions test/src/fuzzer-parse_ubjson.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,12 @@ array data, it performs the following steps:
- vec = to_ubjson(j1)
- j2 = from_ubjson(vec)
- assert(j1 == j2)
- vec2 = to_ubjson(j1, use_size = true, use_type = false)
- j3 = from_ubjson(vec2)
- assert(j1 == j3)
- vec3 = to_ubjson(j1, use_size = true, use_type = true)
- j4 = from_ubjson(vec3)
- assert(j1 == j4)

The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
drivers.
Expand All @@ -35,14 +41,24 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)

try
{
// step 2: round trip
std::vector<uint8_t> vec2 = json::to_ubjson(j1);
// step 2.1: round trip without adding size annotations to container types
std::vector<uint8_t> vec2 = json::to_ubjson(j1, false, false);

// step 2.2: round trip with adding size annotations but without adding type annonations to container types
std::vector<uint8_t> vec3 = json::to_ubjson(j1, true, false);

// step 2.3: round trip with adding size as well as type annotations to container types
std::vector<uint8_t> vec4 = json::to_ubjson(j1, true, true);

// parse serialization
json j2 = json::from_ubjson(vec2);
json j3 = json::from_ubjson(vec3);
json j4 = json::from_ubjson(vec4);

// serializations must match
assert(json::to_ubjson(j2) == vec2);
assert(json::to_ubjson(j2, false, false) == vec2);
assert(json::to_ubjson(j3, true, false) == vec3);
assert(json::to_ubjson(j4, true, true) == vec4);
}
catch (const json::parse_error&)
{
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