Merge commit 'c992cb4e42cc223f67ede0e48d7ff3f4947af0c6' as 'test/compatibility/C/uWebSockets'

test/compatibility/C/uWebSockets/fuzzing/helpers.h

@@ -0,0 +1,51 @@
+#ifndef HELPERS_H
+#define HELPERS_H
+
+/* Common helpers for fuzzing */
+
+#include <functional>
+#include <string_view>
+#include <cstring>
+
+/* We use this to pad the fuzz */
+static inline const uint8_t *makePadded(const uint8_t *data, size_t size) {
+    static int paddedLength = 512 * 1024;
+    static char *padded = new char[128 + paddedLength + 128];
+
+    /* Increase landing area if required */
+    if (paddedLength < size) {
+        delete [] padded;
+        paddedLength = size;
+        padded = new char [128 + paddedLength + 128];
+    }
+
+    memcpy(padded + 128, data, size);
+
+    return (uint8_t *) padded + 128;
+}
+
+/* Splits the fuzz data in one or many chunks */
+static inline void makeChunked(const uint8_t *data, size_t size, std::function<void(const uint8_t *data, size_t size)> cb) {
+    /* First byte determines chunk size; 0 is all that remains, 1-255 is small chunk */
+    for (int i = 0; i < size; ) {
+        unsigned int chunkSize = data[i++];
+        if (!chunkSize) {
+            chunkSize = size - i;
+        } else {
+            chunkSize = std::min<int>(chunkSize, size - i);
+        }
+
+        cb(data + i, chunkSize);
+        i += chunkSize;
+    }
+}
+
+/* Reads all bytes to trigger invalid reads */
+static inline void readBytes(std::string_view s) {
+    volatile int sum = 0;
+    for (int i = 0; i < s.size(); i++) {
+        sum += s[i];
+    }
+}
+
+#endif