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filesrc: Don't use fstat() on Windows but use specific Windows APIs

Browse source 
fstat() fails on Windows in various situations if the file metadata has
invalid values, and we only care about getting attributes and the file
size.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/610>
This commit is contained in:
Sebastian Dröge 2020-09-02 17:01:42 +03:00 committed by Seungha Yang
parent 671e459d69
commit 44e3888657
1 changed files with 54 additions and 18 deletions
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72
plugins/elements/gstfilesrc.c
View file

@ -44,11 +44,10 @@
#include <sys/types.h>
#include <sys/stat.h>
#ifdef G_OS_WIN32
#include <windows.h>
#include <io.h> /* lseek, open, close, read */
/* On win32, stat* default to 32 bit; we need the 64-bit
* variants, so explicitly define it that way. */
#undef fstat
#define fstat _fstat64
#undef lseek
#define lseek _lseeki64
#undef off_t
@ -57,6 +56,7 @@
* _stat*, since we're explicitly overriding that */
#undef _INC_STAT_INL
#endif
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
@ -432,7 +432,6 @@ gst_file_src_is_seekable (GstBaseSrc * basesrc)
static gboolean
gst_file_src_get_size (GstBaseSrc * basesrc, guint64 * size)
{
struct_stat stat_results;
GstFileSrc *src;
src = GST_FILE_SRC (basesrc);
@ -442,11 +441,27 @@ gst_file_src_get_size (GstBaseSrc * basesrc, guint64 * size)
* succeed, and wrongly say our length is zero. */
return FALSE;
}
#ifdef G_OS_WIN32
{
HANDLE h = _get_osfhandle (src->fd);
DWORD size_low, size_high;
if (fstat (src->fd, &stat_results) < 0)
goto could_not_stat;
size_low = GetFileSize (h, &size_high);
if (size_low == INVALID_FILE_SIZE)
goto could_not_stat;
*size = stat_results.st_size;
*size = (((guint64) size_high) << 32) | size_low;
}
#else
{
struct_stat stat_results;
if (fstat (src->fd, &stat_results) < 0)
goto could_not_stat;
*size = stat_results.st_size;
}
#endif
return TRUE;
@ -462,7 +477,6 @@ static gboolean
gst_file_src_start (GstBaseSrc * basesrc)
{
GstFileSrc *src = GST_FILE_SRC (basesrc);
struct_stat stat_results;
if (src->filename == NULL || src->filename[0] == '\0')
goto no_filename;
@ -475,22 +489,42 @@ gst_file_src_start (GstBaseSrc * basesrc)
if (src->fd < 0)
goto open_failed;
/* check if it is a regular file, otherwise bail out */
if (fstat (src->fd, &stat_results) < 0)
goto no_stat;
#ifdef G_OS_WIN32
{
HANDLE h = _get_osfhandle (src->fd);
BY_HANDLE_FILE_INFORMATION file_info;
if (S_ISDIR (stat_results.st_mode))
goto was_directory;
if (!GetFileInformationByHandle (h, &file_info))
goto no_stat;
if (S_ISSOCK (stat_results.st_mode))
goto was_socket;
if (file_info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
goto was_directory;
/* everything's a regular file on Windows */
src->is_regular = TRUE;
}
#else
{
struct_stat stat_results;
/* check if it is a regular file, otherwise bail out */
if (fstat (src->fd, &stat_results) < 0)
goto no_stat;
if (S_ISDIR (stat_results.st_mode))
goto was_directory;
if (S_ISSOCK (stat_results.st_mode))
goto was_socket;
/* record if it's a regular (hence seekable and lengthable) file */
if (S_ISREG (stat_results.st_mode))
src->is_regular = TRUE;
}
#endif
src->read_position = 0;
/* record if it's a regular (hence seekable and lengthable) file */
if (S_ISREG (stat_results.st_mode))
src->is_regular = TRUE;
/* We need to check if the underlying file is seekable. */
{
off_t res = lseek (src->fd, 0, SEEK_END);
@ -554,12 +588,14 @@ was_directory:
(_("\"%s\" is a directory."), src->filename), (NULL));
goto error_close;
}
#ifndef G_OS_WIN32
was_socket:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ,
(_("File \"%s\" is a socket."), src->filename), (NULL));
goto error_close;
}
#endif
lseek_wonky:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),