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PiperOrigin-RevId: 598898824

fuzztest/fuzztest_macros.h

diff --git a/fuzztest/fuzztest_macros.h b/fuzztest/fuzztest_macros.h
index 6228e2f..172d0f6 100644
--- a/fuzztest/fuzztest_macros.h
+++ b/fuzztest/fuzztest_macros.h
@@ -15,6 +15,7 @@
 #ifndef FUZZTEST_FUZZTEST_FUZZTEST_MACROS_H_
 #define FUZZTEST_FUZZTEST_FUZZTEST_MACROS_H_
 
+#include <cstdint>
 #include <string>
 #include <string_view>
 #include <tuple>
@@ -126,6 +127,12 @@
   return internal::ReadFilesFromDirectory({dir.data(), dir.size()});
 }
 
+// Converts string_view into a byte-array, useful when working with the LLVM
+// fuzzer interfaces.
+inline std::vector<uint8_t> ToByteArray(std::string_view str) {
+  return std::vector<uint8_t>(str.begin(), str.end());
+}
+
 }  // namespace fuzztest
 
 #endif  // FUZZTEST_FUZZTEST_FUZZTEST_MACROS_H_

fuzztest/internal/domains/container_of_impl.h

diff --git a/fuzztest/internal/domains/container_of_impl.h b/fuzztest/internal/domains/container_of_impl.h
index db59c66..2b22a11 100644
--- a/fuzztest/internal/domains/container_of_impl.h
+++ b/fuzztest/internal/domains/container_of_impl.h
@@ -247,7 +247,8 @@
   }
 
   auto GetPrinter() const {
-    if constexpr (std::is_same_v<value_type, std::string>) {
+    if constexpr (std::is_same_v<value_type, std::string> ||
+                  std::is_same_v<value_type, std::vector<uint8_t>>) {
       // std::string has special handling for better output
       return StringPrinter{};
     } else {

fuzztest/internal/type_support.h

diff --git a/fuzztest/internal/type_support.h b/fuzztest/internal/type_support.h
index fb0e8ed..f09a1d7 100644
--- a/fuzztest/internal/type_support.h
+++ b/fuzztest/internal/type_support.h
@@ -23,7 +23,7 @@
 #include <string_view>
 #include <tuple>
 #include <type_traits>
-#include <utility>
+#include <vector>
 
 #include "absl/debugging/symbolize.h"
 #include "absl/numeric/int128.h"
@@ -172,9 +172,11 @@
         // Make sure to properly C-escape strings when printing source code, and
         // explicitly construct a std::string of the right length if there is an
         // embedded NULL character.
-        const absl::string_view input(v.data(), v.size());
+        const std::string input(v.data(), v.data() + v.size());
         const std::string escaped = absl::CEscape(input);
-        if (absl::StrContains(input, '\0')) {
+        if constexpr (std::is_convertible_v<T, std::vector<uint8_t>>) {
+          absl::Format(out, "fuzztest::ToByteArray(\"%s\")", escaped);
+        } else if (absl::StrContains(input, '\0')) {
           absl::Format(out, "std::string(\"%s\", %d)", escaped, v.size());
         } else {
           absl::Format(out, "\"%s\"", escaped);
@@ -584,7 +586,8 @@
   } else if constexpr (std::is_floating_point_v<T>) {
     return FloatingPrinter{};
   } else if constexpr (std::is_convertible_v<T, absl::string_view> ||
-                       std::is_convertible_v<T, std::string_view>) {
+                       std::is_convertible_v<T, std::string_view> ||
+                       std::is_convertible_v<T, std::vector<uint8_t>>) {
     return StringPrinter{};
   } else if constexpr (is_monostate_v<T>) {
     return MonostatePrinter{};

fuzztest/internal/type_support_test.cc

diff --git a/fuzztest/internal/type_support_test.cc b/fuzztest/internal/type_support_test.cc
index fe2c3f0..13df5f9 100644
--- a/fuzztest/internal/type_support_test.cc
+++ b/fuzztest/internal/type_support_test.cc
@@ -18,6 +18,7 @@
 #include <array>
 #include <cmath>
 #include <complex>
+#include <cstdint>
 #include <limits>
 #include <list>
 #include <map>
@@ -193,6 +194,12 @@
                           R"("printf(\"Hello, world!\");")"));
 }
 
+TEST(ByteArrayTest, Printer) {
+  EXPECT_THAT(TestPrintValue(std::vector<uint8_t>{'\0', 'a', 0223, 'b', '\"'}),
+              ElementsAre(R"("\000a\223b"")",
+                          R"(fuzztest::ToByteArray("\000a\223b\""))"));
+}
+
 TEST(CompoundTest, Printer) {
   EXPECT_THAT(
       TestPrintValue(std::pair(1, 1.5), Arbitrary<std::pair<int, double>>()),