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05fdd09740
Extended path prefix looks like "\\?\",
and NT object path prefix looks like "\??\".
Strip them only if they are followed by a character
(any character) and a colon (:), indicating that
it's a DOS path with a drive.
Otherwise stripping such prefix might result in a patch
that looks like a relative path.
For example, "\\?\Volume{GUID}\" becomes "Volume{GUID}\",
which is a valid directory name.
Currently it's up to the user to make sense of such paths.
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/* gstdio-private.c - private glib functions for gstdio.c
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*
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* Copyright 2004 Tor Lillqvist
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* Copyright 2018 Руслан Ижбулатов
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*
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* This 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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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* Strips "\\\\?\\" extended prefix or
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* "\\??\\" NT Object Manager prefix from
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* @str in-place, using memmove.
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* @str_size must point to the size of @str
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* in gunichar2s, including NUL-terminator
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* (if @str is NUL-terminated; it doesn't have to be).
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* On return @str_size will correctly reflect changes
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* in @str size (if any).
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* Returns TRUE if @str was modified.
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*/
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static gboolean
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_g_win32_strip_extended_ntobjm_prefix (gunichar2 *str,
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gsize *str_size)
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{
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const wchar_t *extended_prefix = L"\\\\?\\";
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const gsize extended_prefix_len = wcslen (extended_prefix);
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const gsize extended_prefix_len_bytes = sizeof (gunichar2) * extended_prefix_len;
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const gsize extended_prefix_with_drive_len_bytes = sizeof (gunichar2) * (extended_prefix_len + 2);
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const wchar_t *ntobjm_prefix = L"\\??\\";
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const gsize ntobjm_prefix_len = wcslen (ntobjm_prefix);
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const gsize ntobjm_prefix_len_bytes = sizeof (gunichar2) * ntobjm_prefix_len;
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const gsize ntobjm_prefix_with_drive_len_bytes = sizeof (gunichar2) * (ntobjm_prefix_len + 2);
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gboolean do_move = FALSE;
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gsize move_shift = 0;
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if ((*str_size) * sizeof (gunichar2) > extended_prefix_with_drive_len_bytes &&
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memcmp (str,
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extended_prefix,
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extended_prefix_len_bytes) == 0 &&
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iswascii (str[extended_prefix_len]) &&
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iswalpha (str[extended_prefix_len]) &&
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str[extended_prefix_len + 1] == L':')
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{
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do_move = TRUE;
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move_shift = extended_prefix_len;
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}
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else if ((*str_size) * sizeof (gunichar2) > ntobjm_prefix_with_drive_len_bytes &&
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memcmp (str,
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ntobjm_prefix,
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ntobjm_prefix_len_bytes) == 0 &&
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iswascii (str[ntobjm_prefix_len]) &&
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iswalpha (str[ntobjm_prefix_len]) &&
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str[ntobjm_prefix_len + 1] == L':')
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{
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do_move = TRUE;
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move_shift = ntobjm_prefix_len;
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}
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if (do_move)
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{
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*str_size -= move_shift;
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memmove (str,
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str + move_shift,
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(*str_size) * sizeof (gunichar2));
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}
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return do_move;
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}
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