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-rw-r--r--tools/fuzzing/libfuzzer/FuzzerIO.cpp165
1 files changed, 165 insertions, 0 deletions
diff --git a/tools/fuzzing/libfuzzer/FuzzerIO.cpp b/tools/fuzzing/libfuzzer/FuzzerIO.cpp
new file mode 100644
index 0000000000..6be2be67c6
--- /dev/null
+++ b/tools/fuzzing/libfuzzer/FuzzerIO.cpp
@@ -0,0 +1,165 @@
+//===- FuzzerIO.cpp - IO utils. -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// IO functions.
+//===----------------------------------------------------------------------===//
+
+#include "mozilla/Unused.h"
+#include "FuzzerDefs.h"
+#include "FuzzerExtFunctions.h"
+#include "FuzzerIO.h"
+#include "FuzzerUtil.h"
+#include <algorithm>
+#include <cstdarg>
+#include <fstream>
+#include <iterator>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+namespace fuzzer {
+
+static FILE *OutputFile = stderr;
+
+long GetEpoch(const std::string &Path) {
+ struct stat St;
+ if (stat(Path.c_str(), &St))
+ return 0; // Can't stat, be conservative.
+ return St.st_mtime;
+}
+
+Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) {
+ std::ifstream T(Path, std::ios::binary);
+ if (ExitOnError && !T) {
+ Printf("No such directory: %s; exiting\n", Path.c_str());
+ exit(1);
+ }
+
+ T.seekg(0, T.end);
+ auto EndPos = T.tellg();
+ if (EndPos < 0) return {};
+ size_t FileLen = EndPos;
+ if (MaxSize)
+ FileLen = std::min(FileLen, MaxSize);
+
+ T.seekg(0, T.beg);
+ Unit Res(FileLen);
+ T.read(reinterpret_cast<char *>(Res.data()), FileLen);
+ return Res;
+}
+
+std::string FileToString(const std::string &Path) {
+ std::ifstream T(Path, std::ios::binary);
+ return std::string((std::istreambuf_iterator<char>(T)),
+ std::istreambuf_iterator<char>());
+}
+
+void CopyFileToErr(const std::string &Path) {
+ Printf("%s", FileToString(Path).c_str());
+}
+
+void WriteToFile(const Unit &U, const std::string &Path) {
+ WriteToFile(U.data(), U.size(), Path);
+}
+
+void WriteToFile(const std::string &Data, const std::string &Path) {
+ WriteToFile(reinterpret_cast<const uint8_t *>(Data.c_str()), Data.size(),
+ Path);
+}
+
+void WriteToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
+ // Use raw C interface because this function may be called from a sig handler.
+ FILE *Out = fopen(Path.c_str(), "wb");
+ if (!Out) return;
+ mozilla::Unused << fwrite(Data, sizeof(Data[0]), Size, Out);
+ fclose(Out);
+}
+
+void ReadDirToVectorOfUnits(const char *Path, Vector<Unit> *V,
+ long *Epoch, size_t MaxSize, bool ExitOnError) {
+ long E = Epoch ? *Epoch : 0;
+ Vector<std::string> Files;
+ int Res = ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/true);
+ if (ExitOnError && Res != 0)
+ exit(Res);
+ size_t NumLoaded = 0;
+ for (size_t i = 0; i < Files.size(); i++) {
+ auto &X = Files[i];
+ if (Epoch && GetEpoch(X) < E) continue;
+ NumLoaded++;
+ if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024)
+ Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path);
+ auto S = FileToVector(X, MaxSize, ExitOnError);
+ if (!S.empty())
+ V->push_back(S);
+ }
+}
+
+
+int GetSizedFilesFromDir(const std::string &Dir, Vector<SizedFile> *V) {
+ Vector<std::string> Files;
+ int Res = ListFilesInDirRecursive(Dir, 0, &Files, /*TopDir*/true);
+ if (Res != 0)
+ return Res;
+ for (auto &File : Files)
+ if (size_t Size = FileSize(File))
+ V->push_back({File, Size});
+ return 0;
+}
+
+std::string DirPlusFile(const std::string &DirPath,
+ const std::string &FileName) {
+ return DirPath + GetSeparator() + FileName;
+}
+
+void DupAndCloseStderr() {
+ int OutputFd = DuplicateFile(2);
+ if (OutputFd >= 0) {
+ FILE *NewOutputFile = OpenFile(OutputFd, "w");
+ if (NewOutputFile) {
+ OutputFile = NewOutputFile;
+ if (EF->__sanitizer_set_report_fd)
+ EF->__sanitizer_set_report_fd(
+ reinterpret_cast<void *>(GetHandleFromFd(OutputFd)));
+ DiscardOutput(2);
+ }
+ }
+}
+
+void CloseStdout() {
+ DiscardOutput(1);
+}
+
+void Printf(const char *Fmt, ...) {
+ va_list ap;
+ va_start(ap, Fmt);
+ vfprintf(OutputFile, Fmt, ap);
+ va_end(ap);
+ fflush(OutputFile);
+}
+
+void VPrintf(bool Verbose, const char *Fmt, ...) {
+ if (!Verbose) return;
+ va_list ap;
+ va_start(ap, Fmt);
+ vfprintf(OutputFile, Fmt, ap);
+ va_end(ap);
+ fflush(OutputFile);
+}
+
+void RmDirRecursive(const std::string &Dir) {
+ IterateDirRecursive(
+ Dir, [](const std::string &Path) {},
+ [](const std::string &Path) { RmDir(Path); },
+ [](const std::string &Path) { RemoveFile(Path); });
+}
+
+std::string TempPath(const char *Prefix, const char *Extension) {
+ return DirPlusFile(TmpDir(), std::string("libFuzzerTemp.") + Prefix +
+ std::to_string(GetPid()) + Extension);
+}
+
+} // namespace fuzzer