Squashed 'external/toxcore/c-toxcore/' changes from 67badf694..82460b212

82460b212 feat: add ngc events
24b54722a fix: Ensure we have allocators available for the error paths.
48dbcfebc cleanup: Remove redundant `-DSODIUM_EXPORT` from definitions.
0cef46ee9 cleanup: Fix a few more clang-tidy warnings.
0c5b918e9 cleanup: Fix a few more clang-tidy warnings.
4d3c97f49 cleanup: Enforce stricter identifier naming using clang-tidy.
a549807df refactor: Add `mem` module to allow tests to override allocators.
6133fb153 chore: Add devcontainer setup for codespaces.
620e07ecd chore: Set a timeout for tests started using Conan
c0ec33b16 chore: Migrate Windows CI from Appveyor to Azure DevOps
8ed47f3ef fix incorrect documentation
a1e245841 docs: Fix doxygen config and remove some redundant comments.
b0f633185 chore: Fix the Android CI job
7469a529b fix: Add missing `#include <array>`.
2b1a6b0d2 add missing ngc constants getter declarations and definitions
2e02d5637 chore: Add missing module dependencies.
REVERT: 67badf694 feat: add ngc events

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 82460b2124216af1ac9d63060de310a682a2fd15

toxcore/tox_events_fuzz_test.cc

@@ -1,13 +1,33 @@
 #include "tox_events.h"
 
 #include <cstdint>
+#include <cstring>
 #include <vector>
 
+#include "../testing/fuzzing/fuzz_support.h"
+
 namespace {
 
-void TestUnpack(const uint8_t *data, size_t size)
+void TestUnpack(Fuzz_Data data)
 {
-    Tox_Events *events = tox_events_load(data, size);
+    // 2 bytes: size of the events data
+    CONSUME_OR_RETURN(const uint8_t *events_size_bytes, data, sizeof(uint16_t));
+    uint16_t events_size;
+    std::memcpy(&events_size, events_size_bytes, sizeof(uint16_t));
+
+    // events_size bytes: events data (max 64K)
+    CONSUME_OR_RETURN(const uint8_t *events_data, data, events_size);
+
+    if (data.size == 0) {
+        // If there's no more input, no malloc failure paths can possibly be
+        // tested, so we ignore this input.
+        return;
+    }
+
+    // rest of the fuzz data is input for malloc
+    Fuzz_System sys{data};
+
+    Tox_Events *events = tox_events_load(sys.sys.get(), events_data, events_size);
     if (events) {
         std::vector<uint8_t> packed(tox_events_bytes_size(events));
         tox_events_get_bytes(events, packed.data());
@@ -20,6 +40,6 @@ void TestUnpack(const uint8_t *data, size_t size)
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
-    TestUnpack(data, size);
+    TestUnpack(Fuzz_Data(data, size));
     return 0;
 }