-/// CheckMagic - Returns true IFF the file named FN begins with Magic. FN must
-/// name a readable file.
-///
-bool CheckMagic (const std::string &FN, const std::string &Magic);
-
-/// IsArchive - Returns true IFF the file named FN appears to be a "ar" library
-/// archive. The file named FN must exist.
-///
-bool IsArchive (const std::string &FN);
-
-/// IsBytecode - Returns true IFF the file named FN appears to be an LLVM
-/// bytecode file. The file named FN must exist.
-///
-bool IsBytecode (const std::string &FN);
-
-/// IsSharedObject - Returns trus IFF the file named FN appears to be a shared
-/// object with an ELF header. The file named FN must exist.
-///
-bool IsSharedObject(const std::string &FN);
-
-/// FileOpenable - Returns true IFF Filename names an existing regular file
-/// which we can successfully open.
-///
-bool FileOpenable(const std::string &Filename);
-
-/// DiffFiles - Compare the two files specified, returning true if they are
-/// different or if there is a file error. If you specify a string to fill in
-/// for the error option, it will set the string to an error message if an error
-/// occurs, allowing the caller to distinguish between a failed diff and a file
-/// system error.
-///
-bool DiffFiles(const std::string &FileA, const std::string &FileB,
- std::string *Error = 0);
-
-
-/// MoveFileOverIfUpdated - If the file specified by New is different than Old,
-/// or if Old does not exist, move the New file over the Old file. Otherwise,
-/// remove the New file.
-///
-void MoveFileOverIfUpdated(const std::string &New, const std::string &Old);
-
-/// removeFile - Delete the specified file
-///
-void removeFile(const std::string &Filename);
-
-/// getUniqueFilename - Return a filename with the specified prefix. If the
-/// file does not exist yet, return it, otherwise add a suffix to make it
-/// unique.
-///
-std::string getUniqueFilename(const std::string &FilenameBase);
-
-/// MakeFileExecutable - This method turns on whatever access attributes are
-/// needed to make the specified file executable. It returns true on success.
-/// In case of failure, the file's access attributes are unspecified.
-///
-bool MakeFileExecutable(const std::string &Filename);
-
-/// MakeFileReadable - This method turns on whatever access attributes are
-/// needed to make the specified file readable. It returns true on success.
-/// In case of failure, the file's access attributes are unspecified.
-///
-bool MakeFileReadable(const std::string &Filename);
-
-/// getFileSize - Return the size of the specified file in bytes, or -1 if the
-/// file cannot be read or does not exist.
-long long getFileSize(const std::string &Filename);
-
-
-/// getFileTimestamp - Get the last modified time for the specified file in an
-/// unspecified format. This is useful to allow checking to see if a file was
-/// updated since that last time the timestampt was aquired. If the file does
-/// not exist or there is an error getting the time-stamp, zero is returned.
-unsigned long long getFileTimestamp(const std::string &Filename);
-
-/// ReadFileIntoAddressSpace - Attempt to map the specific file into the
-/// address space of the current process for reading. If this succeeds,
-/// return the address of the buffer and the length of the file mapped. On
-/// failure, return null.
-void *ReadFileIntoAddressSpace(const std::string &Filename, unsigned &Length);
-
-/// UnmapFileFromAddressSpace - Remove the specified file from the current
-/// address space.
-void UnmapFileFromAddressSpace(void *Buffer, unsigned Length);
-
-
-/// FDHandle - Simple handle class to make sure a file descriptor gets closed
-/// when the object is destroyed. This handle acts similarly to an
-/// std::auto_ptr, in that the copy constructor and assignment operators
-/// transfer ownership of the handle. This means that FDHandle's do not have
-/// value semantics.
-///
-class FDHandle {
- int FD;
-public:
- FDHandle() : FD(-1) {}
- FDHandle(int fd) : FD(fd) {}
- FDHandle(FDHandle &RHS) : FD(RHS.FD) {
- RHS.FD = -1; // Transfer ownership
- }
-
- ~FDHandle() throw();
-
- /// get - Get the current file descriptor, without releasing ownership of it.
- int get() const { return FD; }
- operator int() const { return FD; }
-
- FDHandle &operator=(int fd) throw();
-
- FDHandle &operator=(FDHandle &RHS) {
- int fd = RHS.FD;
- RHS.FD = -1; // Transfer ownership
- return operator=(fd);
- }