90 lines
2.0 KiB
C++
90 lines
2.0 KiB
C++
/*
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* \brief TAR file-system directory node
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* \author Christian Prochaska
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* \author Norman Feske
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* \date 2012-08-20
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*/
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/*
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* Copyright (C) 2012-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _DIRECTORY_H_
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#define _DIRECTORY_H_
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/* local includes */
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#include <lookup.h>
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#include <node.h>
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namespace File_system {
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using namespace Genode;
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class Directory : public Node
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{
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public:
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Directory(Record *record) : Node(record) { }
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size_t read(char *dst, size_t len, seek_off_t seek_offset)
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{
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bool verbose = false;
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if (verbose)
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PDBG("len = %zu, seek_offset = %llu", len, seek_offset);
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if (len < sizeof(Directory_entry)) {
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PERR("read buffer too small for directory entry");
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return 0;
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}
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if (seek_offset % sizeof(Directory_entry)) {
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PERR("seek offset not alighed to sizeof(Directory_entry)");
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return 0;
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}
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int64_t index = seek_offset / sizeof(Directory_entry);
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Lookup_member_of_path lookup_criterion(_record->name(), index);
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Record *record = _lookup(&lookup_criterion);
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if (!record)
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return 0;
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Absolute_path absolute_path(record->name());
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absolute_path.keep_only_last_element();
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absolute_path.remove_trailing('/');
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Directory_entry *e = (Directory_entry *)(dst);
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strncpy(e->name, absolute_path.base(), sizeof(e->name));
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switch (record->type()) {
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case Record::TYPE_DIR: e->type = Directory_entry::TYPE_DIRECTORY; break;
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case Record::TYPE_FILE: e->type = Directory_entry::TYPE_FILE; break;
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case Record::TYPE_SYMLINK: e->type = Directory_entry::TYPE_SYMLINK; break;
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default:
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if (verbose)
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PDBG("unhandled record type %d", record->type());
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}
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if (verbose)
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PDBG("found dir entry: %s", e->name);
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return sizeof(Directory_entry);
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}
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size_t write(char const *src, size_t len, seek_off_t)
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{
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/* writing to directory nodes is not supported */
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return 0;
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}
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};
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}
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#endif /* _DIRECTORY_H_ */
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