Add basic extended attributes support
This commit adds extended attributes support to TDEIO, tdeio_file and a read-write plugin for the file properties dialog. Signed-off-by: Philippe Mavridis <philippe.mavridis@yandex.com>feat/extended-attributes
Philippe Mavridis
1 week ago
parent
2e76346c68
commit
c17df85bda
@ -0,0 +1,355 @@
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/*******************************************************************************
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Extended attributes support for TDE
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Copyright © 2025 Philippe Mavridis <philippe.mavridis@yandex.com>
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Based on xattr_p.h from KFileMetaData
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Copyright © 2014 Raphael Kubo da Costa <rakuco@FreeBSD.org>
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This program or 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 License as
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published by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details.
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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, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*******************************************************************************/
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#include <sys/types.h>
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#include <errno.h>
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#if defined(Q_OS_LINUX) || defined(__GLIBC__)
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# include <sys/xattr.h>
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#elif defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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# include <sys/extattr.h>
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#endif
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#include <tqfile.h>
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#include "tdexattr.h"
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#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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# define CHECK_URL(url) \
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if (!url.isValid() || url.isEmpty()) return TDEIO::ERR_MALFORMED_URL; \
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if (!url.isLocalFile()) return 0; // silently ignore non-local urls
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# define GET_ENCODED_PATH(url) \
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const TQByteArray p = TQFile::encodeName(url.path()); \
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const char* encodedPath = p.data();
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#if defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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static TQValueList<TQCString> // FIXME untested
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splitLengthValue(TQByteArray data)
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{
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uint pos = 0;
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TQValueList<TQCString> entries;
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char *s;
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while (pos < data.size())
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{
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uchar len = data[pos];
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if (pos + 1 + len <= data.size())
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{
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strncat(s, &data[pos + 1], len);
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entries.append(TQCString(s, len));
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}
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pos += 1 + len;
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}
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return entries;
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}
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#else
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static TQValueList<TQCString>
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splitZeroSeparator(TQByteArray data)
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{
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uint pos = 0;
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TQValueList<TQCString> entries;
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while (pos < data.size())
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{
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const char *c = &data[pos];
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size_t len = strlen(c);
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entries.append(TQCString(c));
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pos += len + 1;
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}
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return entries;
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}
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#endif
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uint
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TDEXAttr::list(const KURL& url, TQValueList<TQCString> *list)
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{
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CHECK_URL(url);
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GET_ENCODED_PATH(url);
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#if defined(Q_OS_LINUX)
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const ssize_t size = listxattr(encodedPath, nullptr, 0);
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#elif defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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const ssize_t size = extattr_list_file(encodedPath, EXTATTR_NAMESPACE_USER, nullptr, 0);
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#endif
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if (size == 0)
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{
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return 0;
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}
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else if (size == -1)
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{
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return parseError(errno, TDEIO::CMD_LISTATTR);
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}
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else
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{
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TQByteArray data(size);
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for (;;)
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{
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#if defined(Q_OS_LINUX)
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const ssize_t r = listxattr(encodedPath, data.data(), data.size());
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#elif defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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const ssize_t r = extattr_list_file(encodedPath, EXTATTR_NAMESPACE_USER, data.data(), data.size());
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#endif
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if (r == 0) {
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list->clear();
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return 0;
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}
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if (r == -1 && errno != ERANGE)
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{
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list->clear();
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return parseError(errno, TDEIO::CMD_LISTATTR);
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}
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if (r > 0)
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{
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data.resize(r);
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break;
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}
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else // ERANGE
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{
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data.resize(data.size() * 2);
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}
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}
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#if defined(Q_OS_LINUX)
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const TQValueList<TQCString> entries = splitZeroSeparator(data);
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#elif defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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const TQValueList<TQCString> entries = splitLengthValue(data);
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#endif
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list->clear();
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TQValueList<TQCString>::const_iterator it;
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for (it = entries.begin(); it != entries.end(); ++it)
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{
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TQCString attribute(*it);
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#if defined(Q_OS_LINUX)
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if (attribute.left(5) != "user.")
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{
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continue;
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}
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#endif
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*list << getVisibleAttributeName(attribute);
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}
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return 0;
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}
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}
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uint
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TDEXAttr::read(const KURL& url, const TQCString& attribute, TQCString *value)
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{
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CHECK_URL(url);
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GET_ENCODED_PATH(url);
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TQCString attr = getLocalAttributeName(attribute);
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#if defined(Q_OS_LINUX) || (defined(__GLIBC__) && !defined(__stub_getxattr))
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const ssize_t size = getxattr(encodedPath, attr, nullptr, 0);
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#elif defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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const ssize_t size = extattr_get_file(encodedPath, EXTATTR_NAMESPACE_USER, attr, NULL, 0);
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#endif
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if (size == -1)
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{
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return parseError(errno, TDEIO::CMD_READATTR);
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}
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else if (size == 0)
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{
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*value = "";
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return 0;
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}
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else
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{
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TQByteArray data(size);
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for (;;)
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{
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#if defined(Q_OS_LINUX) || (defined(__GLIBC__) && !defined(__stub_getxattr))
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const ssize_t r = getxattr(encodedPath, attr, data.data(), data.size());
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#elif defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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const ssize_t r = extattr_get_file(encodedPath, EXTATTR_NAMESPACE_USER, attr, data.data(), data.size());
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#endif
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if (r == -1 && errno != ERANGE)
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{
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*value = "";
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return parseError(errno, TDEIO::CMD_READATTR);
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}
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else if (r == 0)
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{
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*value = "";
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return 0;
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}
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else if (r >= 0)
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{
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*value = TQCString(data, r + 1);
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return 0;
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}
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else // ERANGE
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{
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data.resize(data.size() * 2);
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}
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}
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}
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}
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uint
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TDEXAttr::write(const KURL& url, const TQCString& attribute, const TQCString& value)
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{
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CHECK_URL(url);
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GET_ENCODED_PATH(url);
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TQCString attr = getLocalAttributeName(attribute);
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int r;
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#if defined(Q_OS_LINUX) || (defined(__GLIBC__) && !defined(__stub_setxattr))
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r = setxattr(encodedPath, attr, value.data(), value.size(), 0);
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#elif defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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r = extattr_set_file(encodedPath, EXTATTR_NAMESPACE_USER, attr, value.data(), value.size());
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#endif
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return r == -1 ? parseError(errno, TDEIO::CMD_WRITEATTR) : 0;
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}
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uint
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TDEXAttr::remove(const KURL& url, const TQCString& attribute)
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{
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CHECK_URL(url);
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GET_ENCODED_PATH(url);
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TQCString attr = getLocalAttributeName(attribute);
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int r;
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#if defined(Q_OS_LINUX) || (defined(__GLIBC__) && !defined(__stub_removexattr))
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r = removexattr(encodedPath, attr);
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#elif defined(Q_OS_FREEBSD) || defined(Q_OS_NETBSD)
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r = extattr_delete_file (encodedPath, EXTATTR_NAMESPACE_USER, attr);
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#else
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return TDEIO::ERR_UNSUPPORTED_ACTION;
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#endif
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return r == -1 ? parseError(errno, TDEIO::CMD_REMOVEATTR) : 0;
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}
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bool
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TDEXAttr::supported(const KURL& url)
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{
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return read(url, "test", nullptr) != TDEIO::ERR_UNSUPPORTED_ACTION;
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}
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#else // stubs for unsupported platforms
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uint
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TDEXAttr::list(const KURL& url, TQValueList<TQCString> *list)
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{
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return TDEIO::ERR_UNSUPPORTED_ACTION;
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}
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uint
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TDEXAttr::read(const KURL& url, const TQCString& attr, TQCString *value)
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{
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return TDEIO::ERR_UNSUPPORTED_ACTION;
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}
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uint
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TDEXAttr::write(const KURL& url, const TQCString& attr, const TQCString& value)
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{
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return TDEIO::ERR_UNSUPPORTED_ACTION;
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}
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TDEIO::Error
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TDEXAttr::remove(const KURL& url, const TQCString& attr)
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{
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return TDEIO::ERR_UNSUPPORTED_ACTION;
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}
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bool
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TDEXAttr::supported(const KURL& url)
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{
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return TDEIO::ERR_UNSUPPORTED_ACTION;
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}
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#endif
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uint
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TDEXAttr::parseError(int _errno, int command)
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{
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switch (_errno)
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{
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case E2BIG:
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case ENODATA:
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{
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return command == TDEIO::CMD_READATTR ?
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TDEIO::ERR_COULD_NOT_READ :
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TDEIO::ERR_COULD_NOT_WRITE;
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}
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case ENOTSUP:
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{
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return TDEIO::ERR_UNSUPPORTED_ACTION;
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}
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case ERANGE:
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{
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return TDEIO::ERR_OUT_OF_MEMORY;
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}
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case EDQUOT:
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case ENOSPC:
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{
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return TDEIO::ERR_DISK_FULL;
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}
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case EPERM:
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{
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return TDEIO::ERR_WRITE_ACCESS_DENIED;
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}
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default:
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{
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return TDEIO::ERR_INTERNAL;
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}
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}
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}
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TQCString
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TDEXAttr::getLocalAttributeName(const TQCString& attr)
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{
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TQCString a(attr);
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#if defined(Q_OS_LINUX)
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a = a.prepend("user.");
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#endif
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return a;
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}
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TQCString
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TDEXAttr::getVisibleAttributeName(const TQCString& attr)
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{
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TQCString a(attr);
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#if defined(Q_OS_LINUX)
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a = a.remove(0, 5);
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#endif
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return a;
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}
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// kate: replace-tabs true; tab-width 4;
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@ -0,0 +1,96 @@
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/*******************************************************************************
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Extended attributes support for TDE
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Copyright © 2025 Philippe Mavridis <philippe.mavridis@yandex.com>
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Based on xattr_p.h from KFileMetaData
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Copyright © 2014 Raphael Kubo da Costa <rakuco@FreeBSD.org>
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This program or 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 License as
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published by the Free Software Foundation; either version 2.1 of the License,
|
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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, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
|
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details.
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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, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*******************************************************************************/
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#ifndef __TDEXATTR_H
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#define __TDEXATTR_H
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#include <kurl.h>
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#include <tdeio/global.h>
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#include <tqvaluelist.h>
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/**
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* Extended attributes support class for TDE.
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*
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* This class implements extended attributes support for TDE. Static methods are
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* provided which can list, read and write user-defined extended attributes of
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* local files.
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*
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* @author Philippe Mavridis <philippe.mavridis@yandex.com>
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*/
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class TDEIO_EXPORT TDEXAttr
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{
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public:
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/**
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* List all the extended attributes of a file.
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* @param url the URL of the file
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* @param list pointer to a TQCString list where the list of attributes will be stored
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* @return the status of the operation (0 for success, enum TDEIO::Error otherwise)
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*/
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static uint list(const KURL& url, TQValueList<TQCString> *list);
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/**
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* Read the value of an extended attribute.
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* @param url the URL of the file
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* @param attr attribute name
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* @param value pointer to TQCString where the value of the attribute @p attr will be stored
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* @return the status of the operation (0 for success, enum TDEIO::Error otherwise)
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*/
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static uint read(const KURL& url, const TQCString& attribute, TQCString *value);
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/**
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* Modify the value of an extended attribute.
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*
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* @param url the URL of the file
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* @param attr attribute name
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* @param value new value of the attribute @p attr
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* @return the status of the operation (0 for success, enum TDEIO::Error otherwise)
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*/
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static uint write(const KURL& url, const TQCString& attribute, const TQCString& value);
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/**
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* Remove an extended attribute.
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*
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* @param url the URL of the file
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* @param attr attribute name
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* @return the status of the operation (0 for success, enum TDEIO::Error otherwise)
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*/
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static uint remove(const KURL& url, const TQCString& attribute);
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/**
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* Check if extended attributes are supported for the given URL.
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*
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* @param url the URL of the file
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* @return true if extended attributes are supported, false otherwise
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*/
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static bool supported(const KURL& url);
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private:
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static TQCString getLocalAttributeName(const TQCString& attr);
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static TQCString getVisibleAttributeName(const TQCString& attr);
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static uint parseError(int _errno, int command);
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};
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#endif // __TDEXATTR_H
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// kate: replace-tabs true; tab-width 2;
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