mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-26 05:14:36 +03:00
133 lines
3.3 KiB
C++
133 lines
3.3 KiB
C++
#ifndef UTIL_FILE_H
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#define UTIL_FILE_H
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#include "util/exception.hh"
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#include "util/scoped.hh"
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#include "util/string_piece.hh"
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#include <cstddef>
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#include <cstdio>
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#include <string>
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#include <stdint.h>
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namespace util {
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class scoped_fd {
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public:
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scoped_fd() : fd_(-1) {}
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explicit scoped_fd(int fd) : fd_(fd) {}
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~scoped_fd();
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void reset(int to = -1) {
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scoped_fd other(fd_);
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fd_ = to;
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}
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int get() const { return fd_; }
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int operator*() const { return fd_; }
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int release() {
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int ret = fd_;
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fd_ = -1;
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return ret;
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}
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private:
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int fd_;
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scoped_fd(const scoped_fd &);
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scoped_fd &operator=(const scoped_fd &);
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};
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struct scoped_FILE_closer {
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static void Close(std::FILE *file);
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};
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typedef scoped<std::FILE, scoped_FILE_closer> scoped_FILE;
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/* Thrown for any operation where the fd is known. */
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class FDException : public ErrnoException {
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public:
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explicit FDException(int fd) throw();
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virtual ~FDException() throw();
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// This may no longer be valid if the exception was thrown past open.
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int FD() const { return fd_; }
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// Guess from NameFromFD.
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const std::string &NameGuess() const { return name_guess_; }
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private:
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int fd_;
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std::string name_guess_;
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};
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// End of file reached.
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class EndOfFileException : public Exception {
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public:
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EndOfFileException() throw();
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~EndOfFileException() throw();
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};
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// Open for read only.
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int OpenReadOrThrow(const char *name);
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// Create file if it doesn't exist, truncate if it does. Opened for write.
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int CreateOrThrow(const char *name);
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// Return value for SizeFile when it can't size properly.
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const uint64_t kBadSize = (uint64_t)-1;
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uint64_t SizeFile(int fd);
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uint64_t SizeOrThrow(int fd);
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void ResizeOrThrow(int fd, uint64_t to);
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std::size_t PartialRead(int fd, void *to, std::size_t size);
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void ReadOrThrow(int fd, void *to, std::size_t size);
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std::size_t ReadOrEOF(int fd, void *to_void, std::size_t size);
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void WriteOrThrow(int fd, const void *data_void, std::size_t size);
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void WriteOrThrow(FILE *to, const void *data, std::size_t size);
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/* These call pread/pwrite in a loop. However, on Windows they call ReadFile/
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* WriteFile which changes the file pointer. So it's safe to call ErsatzPRead
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* and ErsatzPWrite concurrently (or any combination thereof). But it changes
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* the file pointer on windows, so it's not safe to call concurrently with
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* anything that uses the implicit file pointer e.g. the Read/Write functions
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* above.
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*/
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void ErsatzPRead(int fd, void *to, std::size_t size, uint64_t off);
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void ErsatzPWrite(int fd, const void *data_void, std::size_t size, uint64_t off);
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void FSyncOrThrow(int fd);
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// Seeking
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void SeekOrThrow(int fd, uint64_t off);
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void AdvanceOrThrow(int fd, int64_t off);
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void SeekEnd(int fd);
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std::FILE *FDOpenOrThrow(scoped_fd &file);
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std::FILE *FDOpenReadOrThrow(scoped_fd &file);
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// Temporary files
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// Append a / if base is a directory.
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void NormalizeTempPrefix(std::string &base);
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int MakeTemp(const StringPiece &prefix);
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std::FILE *FMakeTemp(const StringPiece &prefix);
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// dup an fd.
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int DupOrThrow(int fd);
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/* Attempt get file name from fd. This won't always work (i.e. on Windows or
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* a pipe). The file might have been renamed. It's intended for diagnostics
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* and logging only.
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*/
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std::string NameFromFD(int fd);
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} // namespace util
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#endif // UTIL_FILE_H
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