mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-09-11 11:25:40 +03:00
247 lines
6.7 KiB
C++
247 lines
6.7 KiB
C++
#include "util/file.hh"
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#include "util/exception.hh"
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#include "util/portability.hh"
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#include <cstdlib>
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#include <cstdio>
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#include <iostream>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdint.h>
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#if defined(_WIN32) || defined(_WIN64)
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#include <windows.h>
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#endif
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namespace util {
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scoped_fd::~scoped_fd() {
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if (fd_ != -1 && close(fd_)) {
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std::cerr << "Could not close file " << fd_ << std::endl;
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std::abort();
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}
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}
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scoped_FILE::~scoped_FILE() {
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if (file_ && std::fclose(file_)) {
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std::cerr << "Could not close file " << std::endl;
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std::abort();
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}
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}
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int OpenReadOrThrow(const char *name) {
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int ret;
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#if defined(_WIN32) || defined(_WIN64)
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UTIL_THROW_IF(-1 == (ret = _open(name, _O_BINARY | _O_RDONLY)), ErrnoException, "while opening " << name);
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#else
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UTIL_THROW_IF(-1 == (ret = open(name, O_RDONLY)), ErrnoException, "while opening " << name);
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#endif
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return ret;
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}
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uint64_t SizeFile(int fd) {
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struct stat sb;
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if (fstat(fd, &sb) == -1 || (!sb.st_size && !S_ISREG(sb.st_mode))) return kBadSize;
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return sb.st_size;
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}
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void ReadOrThrow(int fd, void *to_void, std::size_t amount) {
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uint8_t *to = static_cast<uint8_t*>(to_void);
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while (amount) {
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ssize_t ret = read(fd, to, amount);
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UTIL_THROW_IF(ret == -1, ErrnoException, "Reading " << amount << " from fd " << fd << " failed.");
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UTIL_THROW_IF(ret == 0, EndOfFileException, "Hit EOF in fd " << fd << " but there should be " << amount << " more bytes to read.");
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amount -= ret;
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to += ret;
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}
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}
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std::size_t ReadOrEOF(int fd, void *to_void, std::size_t amount) {
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uint8_t *to = static_cast<uint8_t*>(to_void);
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std::size_t remaining = amount;
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while (remaining) {
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ssize_t ret = read(fd, to, remaining);
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UTIL_THROW_IF(ret == -1, ErrnoException, "Reading " << remaining << " from fd " << fd << " failed.");
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if (!ret) return amount - remaining;
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remaining -= ret;
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to += ret;
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}
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return amount;
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}
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void WriteOrThrow(int fd, const void *data_void, std::size_t size) {
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const uint8_t *data = static_cast<const uint8_t*>(data_void);
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while (size) {
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ssize_t ret = write(fd, data, size);
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if (ret < 1) UTIL_THROW(util::ErrnoException, "Write failed");
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data += ret;
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size -= ret;
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}
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}
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namespace {
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void InternalSeek(int fd, off_t off, int whence) {
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UTIL_THROW_IF((off_t)-1 == lseek(fd, off, whence), ErrnoException, "Seek failed");
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}
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} // namespace
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void SeekOrThrow(int fd, uint64_t off) {
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InternalSeek(fd, off, SEEK_SET);
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}
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void AdvanceOrThrow(int fd, int64_t off) {
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InternalSeek(fd, off, SEEK_CUR);
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}
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void SeekEnd(int fd) {
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InternalSeek(fd, 0, SEEK_END);
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}
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std::FILE *FDOpenOrThrow(scoped_fd &file) {
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std::FILE *ret = fdopen(file.get(), "r+b");
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if (!ret) UTIL_THROW(util::ErrnoException, "Could not fdopen");
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file.release();
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return ret;
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}
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TempMaker::TempMaker(const std::string &prefix) : base_(prefix) {
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base_ += "XXXXXX";
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}
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// Sigh. Windows temporary file creation is full of race conditions.
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#if defined(_WIN32) || defined(_WIN64)
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/* mkstemp extracted from libc/sysdeps/posix/tempname.c. Copyright
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(C) 1991-1999, 2000, 2001, 2006 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. */
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/* This has been modified from the original version to rename the function and
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* set the Windows temporary flag. */
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static const char letters[] =
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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/* Generate a temporary file name based on TMPL. TMPL must match the
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rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
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does not exist at the time of the call to mkstemp. TMPL is
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overwritten with the result. */
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int
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mkstemp_and_unlink(char *tmpl)
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{
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int len;
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char *XXXXXX;
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static unsigned long long value;
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unsigned long long random_time_bits;
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unsigned int count;
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int fd = -1;
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int save_errno = errno;
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/* A lower bound on the number of temporary files to attempt to
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generate. The maximum total number of temporary file names that
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can exist for a given template is 62**6. It should never be
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necessary to try all these combinations. Instead if a reasonable
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number of names is tried (we define reasonable as 62**3) fail to
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give the system administrator the chance to remove the problems. */
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#define ATTEMPTS_MIN (62 * 62 * 62)
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/* The number of times to attempt to generate a temporary file. To
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conform to POSIX, this must be no smaller than TMP_MAX. */
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#if ATTEMPTS_MIN < TMP_MAX
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unsigned int attempts = TMP_MAX;
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#else
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unsigned int attempts = ATTEMPTS_MIN;
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#endif
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len = strlen (tmpl);
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if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
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{
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errno = EINVAL;
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return -1;
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}
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/* This is where the Xs start. */
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XXXXXX = &tmpl[len - 6];
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/* Get some more or less random data. */
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{
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SYSTEMTIME stNow;
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FILETIME ftNow;
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// get system time
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GetSystemTime(&stNow);
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stNow.wMilliseconds = 500;
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if (!SystemTimeToFileTime(&stNow, &ftNow))
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{
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errno = -1;
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return -1;
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}
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random_time_bits = (((unsigned long long)ftNow.dwHighDateTime << 32)
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| (unsigned long long)ftNow.dwLowDateTime);
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}
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value += random_time_bits ^ (unsigned long long)GetCurrentThreadId ();
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for (count = 0; count < attempts; value += 7777, ++count)
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{
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unsigned long long v = value;
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/* Fill in the random bits. */
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XXXXXX[0] = letters[v % 62];
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v /= 62;
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XXXXXX[1] = letters[v % 62];
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v /= 62;
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XXXXXX[2] = letters[v % 62];
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v /= 62;
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XXXXXX[3] = letters[v % 62];
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v /= 62;
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XXXXXX[4] = letters[v % 62];
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v /= 62;
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XXXXXX[5] = letters[v % 62];
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/* Modified for windows and to unlink */
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// fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, _S_IREAD | _S_IWRITE);
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fd = _open (tmpl, _O_RDWR | _O_CREAT | _O_TEMPORARY | _O_EXCL | _O_BINARY, _S_IREAD | _S_IWRITE);
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if (fd >= 0)
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{
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errno = save_errno;
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return fd;
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}
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else if (errno != EEXIST)
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return -1;
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}
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/* We got out of the loop because we ran out of combinations to try. */
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errno = EEXIST;
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return -1;
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}
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#else
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int
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mkstemp_and_unlink(char *tmpl) {
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int ret = mkstemp(tmpl);
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if (ret == -1) return -1;
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UTIL_THROW_IF(unlink(tmpl), util::ErrnoException, "Failed to delete " << tmpl);
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return ret;
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}
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#endif
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int TempMaker::Make() const {
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std::string copy(base_);
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copy.push_back(0);
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int ret;
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UTIL_THROW_IF(-1 == (ret = mkstemp_and_unlink(©[0])), util::ErrnoException, "Failed to make a temporary based on " << base_);
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return ret;
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}
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std::FILE *TempMaker::MakeFile() const {
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util::scoped_fd file(Make());
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return FDOpenOrThrow(file);
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}
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} // namespace util
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