1 files changed, 125 insertions, 0 deletions
diff --git a/fuzz/ParseFuzzer.cpp b/fuzz/ParseFuzzer.cpp
new file mode 100644
index 0000000..adb83d7
--- /dev/null
+++ b/fuzz/ParseFuzzer.cpp
@@ -0,0 +1,125 @@
+// Copyright 2020 Google LLC
+// Copyright 2025 Mikhail Khachaiants <mkhachaiants@gmail.com>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "uriparser/Uri.h"
+#include "uriparser/UriIp4.h"
+#include "FuzzingUtils.h"
+#include <cstddef>
+#include <cstring>
+#include <vector>
+
+class UriHolder {
+public:
+    UriHolder() {
+        memset((void *)&uri_, 0, sizeof(uri_));
+    }
+
+    ~UriHolder() {
+        URI_FUNC(FreeUriMembers)(&uri_);
+    }
+
+    URI_TYPE(Uri) * get() {
+        return &uri_;
+    }
+
+private:
+    URI_TYPE(Uri) uri_;
+};
+
+void Escapes(const UriString & uri) {
+    const URI_CHAR * first = uri.c_str();
+    // Up to 6 bytes per character with normalizeBreaks enabled (\n -> %0D%0A)
+    std::vector<URI_CHAR> buf1(uri.size() * 6 + 1);
+    // and up to 3 bytes per character otherwise
+    std::vector<URI_CHAR> buf2(uri.size() * 3 + 1);
+
+    URI_FUNC(Escape)(first, &buf1[0], URI_TRUE, URI_TRUE);
+    URI_FUNC(Escape)(first, &buf1[0], URI_FALSE, URI_TRUE);
+    if (buf1.data()) {
+        URI_FUNC(UnescapeInPlace)(&buf1[0]);
+    }
+
+    URI_FUNC(Escape)(first, &buf2[0], URI_TRUE, URI_FALSE);
+    URI_FUNC(Escape)(first, &buf2[0], URI_FALSE, URI_FALSE);
+    if (buf2.data()) {
+        URI_FUNC(UnescapeInPlace)(&buf2[0]);
+    }
+}
+
+void FileNames(const UriString & uri) {
+    const size_t size = 8 + 3 * uri.size() + 1;
+    std::vector<URI_CHAR> buf(size);
+
+    URI_FUNC(UnixFilenameToUriString)(uri.c_str(), &buf[0]);
+    URI_FUNC(WindowsFilenameToUriString)(uri.c_str(), &buf[0]);
+    URI_FUNC(UriStringToUnixFilename)(uri.c_str(), &buf[0]);
+    URI_FUNC(UriStringToWindowsFilename)(uri.c_str(), &buf[0]);
+}
+
+void Ipv4(const UriString & s) {
+    const URI_CHAR * cstr = s.c_str();
+    unsigned char result[4] = {};
+    URI_FUNC(ParseIpFourAddress)(result, cstr, &cstr[s.size()]);
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t * data, size_t size) {
+    FuzzedDataProvider stream(data, size);
+    bool domainRelative = stream.ConsumeBool();
+
+    const UriString uri1 = consumeRandomLengthString(stream);
+    const UriString uri2 = consumeRemainingBytesAsString(stream);
+
+    Escapes(uri1);
+    Escapes(uri2);
+
+    FileNames(uri1);
+    FileNames(uri2);
+
+    Ipv4(uri1);
+    Ipv4(uri2);
+
+    UriHolder uriHolder1;
+    URI_TYPE(ParserState) state1;
+    state1.uri = uriHolder1.get();
+    if (URI_FUNC(ParseUri)(&state1, uri1.c_str()) != URI_SUCCESS) {
+        return 0;
+    }
+
+    URI_CHAR buf[1024 * 8] = {0};
+    int written = 0;
+    URI_FUNC(ToString)(buf, state1.uri, sizeof(buf) / sizeof(buf[0]), &written);
+
+    UriHolder uriHolder2;
+    if (URI_FUNC(ParseSingleUri)(uriHolder2.get(), uri2.c_str(), nullptr)
+        != URI_SUCCESS) {
+        return 0;
+    }
+
+    URI_FUNC(EqualsUri)(state1.uri, uriHolder2.get());
+
+    unsigned int mask = 0;
+    URI_FUNC(NormalizeSyntaxMaskRequiredEx)(state1.uri, &mask);
+    URI_FUNC(NormalizeSyntax)(state1.uri);
+
+    URI_TYPE(Uri) absUri;
+    URI_FUNC(AddBaseUri)(&absUri, state1.uri, uriHolder2.get());
+    URI_FUNC(FreeUriMembers)(&absUri);
+
+    URI_TYPE(Uri) relUri;
+    URI_FUNC(RemoveBaseUri)(&relUri, state1.uri, uriHolder2.get(), domainRelative);
+    URI_FUNC(FreeUriMembers)(&relUri);
+
+    return 0;
+}