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ntdll: Pass the full I/O status block to append_entry and have it set the status code on overflow.

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This commit is contained in:
Alexandre Julliard 2009-11-18 17:37:15 +01:00
parent da1df74147
commit c843665c12
1 changed files with 32 additions and 43 deletions
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75
dlls/ntdll/directory.c
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@ -923,7 +923,7 @@ static BOOLEAN match_filename( const UNICODE_STRING *name_str, const UNICODE_STR
*
* helper for NtQueryDirectoryFile
*/
static FILE_BOTH_DIR_INFORMATION *append_entry( void *info_ptr, ULONG_PTR *pos, ULONG max_length,
static FILE_BOTH_DIR_INFORMATION *append_entry( void *info_ptr, IO_STATUS_BLOCK *io, ULONG max_length,
const char *long_name, const char *short_name,
const UNICODE_STRING *mask )
{
@ -935,6 +935,7 @@ static FILE_BOTH_DIR_INFORMATION *append_entry( void *info_ptr, ULONG_PTR *pos,
UNICODE_STRING str;
ULONG attributes = 0;
io->u.Status = STATUS_SUCCESS;
long_len = ntdll_umbstowcs( 0, long_name, strlen(long_name), long_nameW, MAX_DIR_ENTRY_LEN );
if (long_len == -1) return NULL;
@ -969,11 +970,6 @@ static FILE_BOTH_DIR_INFORMATION *append_entry( void *info_ptr, ULONG_PTR *pos,
if (!match_filename( &str, mask )) return NULL;
}
total_len = (sizeof(*info) - sizeof(info->FileName) + long_len*sizeof(WCHAR) + 3) & ~3;
info = (FILE_BOTH_DIR_INFORMATION *)((char *)info_ptr + *pos);
if (*pos + total_len > max_length) total_len = max_length - *pos;
if (lstat( long_name, &st ) == -1) return NULL;
if (S_ISLNK( st.st_mode ))
{
@ -988,6 +984,14 @@ static FILE_BOTH_DIR_INFORMATION *append_entry( void *info_ptr, ULONG_PTR *pos,
if (!show_dot_files && long_name[0] == '.' && long_name[1] && (long_name[1] != '.' || long_name[2]))
attributes |= FILE_ATTRIBUTE_HIDDEN;
total_len = (sizeof(*info) - sizeof(info->FileName) + long_len*sizeof(WCHAR) + 3) & ~3;
if (io->Information + total_len > max_length)
{
total_len = max_length - io->Information;
io->u.Status = STATUS_BUFFER_OVERFLOW;
}
info = (FILE_BOTH_DIR_INFORMATION *)((char *)info_ptr + io->Information);
fill_stat_info( &st, info, FileBothDirectoryInformation );
info->NextEntryOffset = total_len;
info->FileIndex = 0; /* NTFS always has 0 here, so let's not bother with it */
@ -999,7 +1003,7 @@ static FILE_BOTH_DIR_INFORMATION *append_entry( void *info_ptr, ULONG_PTR *pos,
memcpy( info->FileName, long_nameW,
min( info->FileNameLength, total_len-sizeof(*info)+sizeof(info->FileName) ));
*pos += total_len;
io->Information += total_len;
return info;
}
@ -1080,19 +1084,14 @@ static int read_directory_vfat( int fd, IO_STATUS_BLOCK *io, void *buffer, ULONG
de[1].d_name[len] = 0;
if (de[1].d_name[0])
info = append_entry( buffer, &io->Information, length,
de[1].d_name, de[0].d_name, mask );
info = append_entry( buffer, io, length, de[1].d_name, de[0].d_name, mask );
else
info = append_entry( buffer, &io->Information, length,
de[0].d_name, NULL, mask );
info = append_entry( buffer, io, length, de[0].d_name, NULL, mask );
if (info)
{
last_info = info;
if ((char *)info->FileName + info->FileNameLength > (char *)buffer + length)
{
io->u.Status = STATUS_BUFFER_OVERFLOW;
if (io->u.Status == STATUS_BUFFER_OVERFLOW)
lseek( fd, old_pos, SEEK_SET ); /* restore pos to previous entry */
}
break;
}
old_pos = lseek( fd, 0, SEEK_CUR );
@ -1112,11 +1111,9 @@ static int read_directory_vfat( int fd, IO_STATUS_BLOCK *io, void *buffer, ULONG
de[1].d_name[len] = 0;
if (de[1].d_name[0])
info = append_entry( buffer, &io->Information, length,
de[1].d_name, de[0].d_name, mask );
info = append_entry( buffer, io, length, de[1].d_name, de[0].d_name, mask );
else
info = append_entry( buffer, &io->Information, length,
de[0].d_name, NULL, mask );
info = append_entry( buffer, io, length, de[0].d_name, NULL, mask );
if (info)
{
last_info = info;
@ -1210,9 +1207,9 @@ static int read_directory_getdents( int fd, IO_STATUS_BLOCK *io, void *buffer, U
if (fake_dot_dot)
{
if ((info = append_entry( buffer, &io->Information, length, ".", NULL, mask )))
if ((info = append_entry( buffer, io, length, ".", NULL, mask )))
last_info = info;
if ((info = append_entry( buffer, &io->Information, length, "..", NULL, mask )))
if ((info = append_entry( buffer, io, length, "..", NULL, mask )))
last_info = info;
/* check if we still have enough space for the largest possible entry */
@ -1229,12 +1226,11 @@ static int read_directory_getdents( int fd, IO_STATUS_BLOCK *io, void *buffer, U
res -= de->d_reclen;
if (de->d_ino &&
!(fake_dot_dot && (!strcmp( de->d_name, "." ) || !strcmp( de->d_name, ".." ))) &&
(info = append_entry( buffer, &io->Information, length, de->d_name, NULL, mask )))
(info = append_entry( buffer, io, length, de->d_name, NULL, mask )))
{
last_info = info;
if ((char *)info->FileName + info->FileNameLength > (char *)buffer + length)
if (io->u.Status == STATUS_BUFFER_OVERFLOW)
{
io->u.Status = STATUS_BUFFER_OVERFLOW;
lseek( fd, old_pos, SEEK_SET ); /* restore pos to previous entry */
break;
}
@ -1374,9 +1370,9 @@ static int read_directory_getdirentries( int fd, IO_STATUS_BLOCK *io, void *buff
if (fake_dot_dot)
{
if ((info = append_entry( buffer, &io->Information, length, ".", NULL, mask )))
if ((info = append_entry( buffer, io, length, ".", NULL, mask )))
last_info = info;
if ((info = append_entry( buffer, &io->Information, length, "..", NULL, mask )))
if ((info = append_entry( buffer, io, length, "..", NULL, mask )))
last_info = info;
restart_last_info = last_info;
@ -1396,25 +1392,22 @@ static int read_directory_getdirentries( int fd, IO_STATUS_BLOCK *io, void *buff
res -= de->d_reclen;
if (de->d_fileno &&
!(fake_dot_dot && (!strcmp( de->d_name, "." ) || !strcmp( de->d_name, ".." ))) &&
((info = append_entry( buffer, &io->Information, length, de->d_name, NULL, mask ))))
((info = append_entry( buffer, io, length, de->d_name, NULL, mask ))))
{
last_info = info;
if ((char *)info->FileName + info->FileNameLength > (char *)buffer + length)
if (io->u.Status == STATUS_BUFFER_OVERFLOW)
{
lseek( fd, (unsigned long)restart_pos, SEEK_SET );
if (restart_info_pos) /* if we have a complete read already, return it */
{
io->u.Status = STATUS_SUCCESS;
io->Information = restart_info_pos;
last_info = restart_last_info;
break;
}
/* otherwise restart from the start with a smaller size */
size = (char *)de - data;
if (!size)
{
io->u.Status = STATUS_BUFFER_OVERFLOW;
break;
}
if (!size) break;
io->Information = 0;
last_info = NULL;
goto restart;
@ -1501,13 +1494,13 @@ static void read_directory_readdir( int fd, IO_STATUS_BLOCK *io, void *buffer, U
for (;;)
{
if (old_pos == 0)
info = append_entry( buffer, &io->Information, length, ".", NULL, mask );
info = append_entry( buffer, io, length, ".", NULL, mask );
else if (old_pos == 1)
info = append_entry( buffer, &io->Information, length, "..", NULL, mask );
info = append_entry( buffer, io, length, "..", NULL, mask );
else if ((de = readdir( dir )))
{
if (strcmp( de->d_name, "." ) && strcmp( de->d_name, ".." ))
info = append_entry( buffer, &io->Information, length, de->d_name, NULL, mask );
info = append_entry( buffer, io, length, de->d_name, NULL, mask );
else
info = NULL;
}
@ -1517,9 +1510,8 @@ static void read_directory_readdir( int fd, IO_STATUS_BLOCK *io, void *buffer, U
if (info)
{
last_info = info;
if ((char *)info->FileName + info->FileNameLength > (char *)buffer + length)
if (io->u.Status == STATUS_BUFFER_OVERFLOW)
{
io->u.Status = STATUS_BUFFER_OVERFLOW;
old_pos--; /* restore pos to previous entry */
break;
}
@ -1577,14 +1569,11 @@ static int read_directory_stat( int fd, IO_STATUS_BLOCK *io, void *buffer, ULONG
ret = stat( unix_name, &st );
if (!ret)
{
FILE_BOTH_DIR_INFORMATION *info = append_entry( buffer, &io->Information, length, unix_name, NULL, NULL );
FILE_BOTH_DIR_INFORMATION *info = append_entry( buffer, io, length, unix_name, NULL, NULL );
if (info)
{
info->NextEntryOffset = 0;
if ((char *)info->FileName + info->FileNameLength > (char *)buffer + length)
io->u.Status = STATUS_BUFFER_OVERFLOW;
else
lseek( fd, 1, SEEK_CUR );
if (io->u.Status != STATUS_BUFFER_OVERFLOW) lseek( fd, 1, SEEK_CUR );
}
else io->u.Status = STATUS_NO_MORE_FILES;
}