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Issue #23152: Implement _Py_fstat() to support files larger than 2 GB on Windows.

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fstat() may fail with EOVERFLOW on files larger than 2 GB because the file size type is an signed 32-bit integer.
This commit is contained in:
Steve Dower 2015-02-21 08:44:05 -08:00
parent 18d1924987
commit f2f373f593
12 changed files with 242 additions and 180 deletions
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16
Python/marshal.c
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@ -1481,16 +1481,20 @@ PyMarshal_ReadLongFromFile(FILE *fp)
return res;
}
#ifdef HAVE_FSTAT
/* Return size of file in bytes; < 0 if unknown. */
#if defined(HAVE_FSTAT) || defined(MS_WINDOWS)
/* Return size of file in bytes; < 0 if unknown or INT_MAX if too big */
static off_t
getfilesize(FILE *fp)
{
struct stat st;
if (fstat(fileno(fp), &st) != 0)
struct _Py_stat_struct st;
if (_Py_fstat(fileno(fp), &st) != 0)
return -1;
#if SIZEOF_OFF_T == 4
else if (st.st_size >= INT_MAX)
return (off_t)INT_MAX;
#endif
else
return st.st_size;
return (off_t)st.st_size;
}
#endif
@ -1505,7 +1509,7 @@ PyMarshal_ReadLastObjectFromFile(FILE *fp)
{
/* REASONABLE_FILE_LIMIT is by defn something big enough for Tkinter.pyc. */
#define REASONABLE_FILE_LIMIT (1L << 18)
#ifdef HAVE_FSTAT
#if defined(HAVE_FSTAT) || defined(MS_WINDOWS)
off_t filesize;
filesize = getfilesize(fp);
if (filesize > 0 && filesize <= REASONABLE_FILE_LIMIT) {