130 lines
3.5 KiB
C++
130 lines
3.5 KiB
C++
//===- FuzzerIO.cpp - IO utils. -------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// IO functions.
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//===----------------------------------------------------------------------===//
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#include "FuzzerIO.h"
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#include "FuzzerDefs.h"
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#include "FuzzerExtFunctions.h"
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#include <algorithm>
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#include <cstdarg>
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#include <fstream>
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#include <iterator>
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#include <sys/stat.h>
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#include <sys/types.h>
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namespace fuzzer {
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static FILE *OutputFile = stderr;
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long GetEpoch(const std::string &Path) {
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struct stat St;
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if (stat(Path.c_str(), &St))
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return 0; // Can't stat, be conservative.
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return St.st_mtime;
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}
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Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) {
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std::ifstream T(Path, std::ios::binary);
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if (ExitOnError && !T) {
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Printf("No such directory: %s; exiting\n", Path.c_str());
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exit(1);
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}
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T.seekg(0, T.end);
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auto EndPos = T.tellg();
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if (EndPos < 0) return {};
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size_t FileLen = EndPos;
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if (MaxSize)
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FileLen = std::min(FileLen, MaxSize);
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T.seekg(0, T.beg);
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Unit Res(FileLen);
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T.read(reinterpret_cast<char *>(Res.data()), FileLen);
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return Res;
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}
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std::string FileToString(const std::string &Path) {
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std::ifstream T(Path, std::ios::binary);
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return std::string((std::istreambuf_iterator<char>(T)),
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std::istreambuf_iterator<char>());
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}
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void CopyFileToErr(const std::string &Path) {
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Printf("%s", FileToString(Path).c_str());
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}
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void WriteToFile(const Unit &U, const std::string &Path) {
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// Use raw C interface because this function may be called from a sig handler.
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FILE *Out = fopen(Path.c_str(), "w");
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if (!Out) return;
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fwrite(U.data(), sizeof(U[0]), U.size(), Out);
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fclose(Out);
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}
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void ReadDirToVectorOfUnits(const char *Path, Vector<Unit> *V,
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long *Epoch, size_t MaxSize, bool ExitOnError) {
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long E = Epoch ? *Epoch : 0;
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Vector<std::string> Files;
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ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/true);
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size_t NumLoaded = 0;
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for (size_t i = 0; i < Files.size(); i++) {
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auto &X = Files[i];
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if (Epoch && GetEpoch(X) < E) continue;
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NumLoaded++;
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if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024)
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Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path);
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auto S = FileToVector(X, MaxSize, ExitOnError);
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if (!S.empty())
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V->push_back(S);
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}
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}
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void GetSizedFilesFromDir(const std::string &Dir, Vector<SizedFile> *V) {
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Vector<std::string> Files;
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ListFilesInDirRecursive(Dir, 0, &Files, /*TopDir*/true);
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for (auto &File : Files)
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if (size_t Size = FileSize(File))
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V->push_back({File, Size});
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}
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std::string DirPlusFile(const std::string &DirPath,
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const std::string &FileName) {
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return DirPath + GetSeparator() + FileName;
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}
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void DupAndCloseStderr() {
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int OutputFd = DuplicateFile(2);
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if (OutputFd > 0) {
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FILE *NewOutputFile = OpenFile(OutputFd, "w");
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if (NewOutputFile) {
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OutputFile = NewOutputFile;
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if (EF->__sanitizer_set_report_fd)
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EF->__sanitizer_set_report_fd(
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reinterpret_cast<void *>(GetHandleFromFd(OutputFd)));
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DiscardOutput(2);
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}
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}
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}
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void CloseStdout() {
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DiscardOutput(1);
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}
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void Printf(const char *Fmt, ...) {
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va_list ap;
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va_start(ap, Fmt);
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vfprintf(OutputFile, Fmt, ap);
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va_end(ap);
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fflush(OutputFile);
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}
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} // namespace fuzzer
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