// 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;

}