mirror of
https://github.com/libretro/scummvm.git
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250 lines
7.1 KiB
C++
250 lines
7.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*/
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#if defined(UNIX)
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#include "common/stdafx.h"
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#include "backends/fs/abstract-fs.h"
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#ifdef MACOSX
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <stdio.h>
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#include <unistd.h>
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/**
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* Implementation of the ScummVM file system API based on POSIX.
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*
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* Parts of this class are documented in the base interface class, AbstractFilesystemNode.
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*/
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class POSIXFilesystemNode : public AbstractFilesystemNode {
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protected:
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String _displayName;
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String _path;
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bool _isDirectory;
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bool _isValid;
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public:
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/**
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* Creates a POSIXFilesystemNode with the root node as path.
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*/
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POSIXFilesystemNode();
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/**
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* Creates a POSIXFilesystemNode for a given path.
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*
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* @param path String with the path the new node should point to.
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* @param verify true if the isValid and isDirectory flags should be verified during the construction.
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*/
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POSIXFilesystemNode(const String &path, bool verify);
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virtual bool exists() const { return access(_path.c_str(), F_OK) == 0; }
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virtual String getDisplayName() const { return _displayName; }
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virtual String getName() const { return _displayName; }
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virtual String getPath() const { return _path; }
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virtual bool isDirectory() const { return _isDirectory; }
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virtual bool isReadable() const { return access(_path.c_str(), R_OK) == 0; }
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virtual bool isWritable() const { return access(_path.c_str(), W_OK) == 0; }
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virtual AbstractFilesystemNode *getChild(const String &n) const;
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virtual bool getChildren(AbstractFSList &list, ListMode mode, bool hidden) const;
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virtual AbstractFilesystemNode *getParent() const;
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private:
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/**
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* Tests and sets the _isValid and _isDirectory flags, using the stat() function.
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*/
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virtual void setFlags();
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};
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/**
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* Returns the last component of a given path.
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*
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* Examples:
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* /foo/bar.txt would return /bar.txt
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* /foo/bar/ would return /bar/
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*
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* @param str String containing the path.
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* @return Pointer to the first char of the last component inside str.
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*/
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const char *lastPathComponent(const Common::String &str) {
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const char *start = str.c_str();
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const char *cur = start + str.size() - 2;
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while (cur >= start && *cur != '/') {
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--cur;
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}
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return cur + 1;
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}
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void POSIXFilesystemNode::setFlags() {
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struct stat st;
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_isValid = (0 == stat(_path.c_str(), &st));
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_isDirectory = _isValid ? S_ISDIR(st.st_mode) : false;
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}
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POSIXFilesystemNode::POSIXFilesystemNode() {
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/* The Browser code now saves the last browsed directory into the config file.
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Hence the need to start at the "current" directory is far less, and we can
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remove this hack for now. Still, there may be some need to obtain a ref
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to the "current" directory. See the TODO list for some thoughts on this.
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I am leaving this code in here for the time being, to be used as reference.
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// FIXME: It is evil & slow to always call getcwd here.
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// The intention behind this hack was/is to be more user friendly
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// in our save/load dialogs: Instead of starting at the FS root,
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// we start at the current directory. However, that's just a hack.
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// Proper solution would be to extend FilesystemNode by the concept
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// of 'current' or 'default' directory, and then modify the
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// save/load dialogs to explicitly use that as starting point.
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char buf[MAXPATHLEN];
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getcwd(buf, MAXPATHLEN);
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_path = buf;
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_displayName = lastPathComponent(_path);
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_path += '/';
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*/
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// The root dir.
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_path = "/";
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_displayName = _path;
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_isValid = true;
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_isDirectory = true;
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}
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POSIXFilesystemNode::POSIXFilesystemNode(const String &p, bool verify) {
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assert(p.size() > 0);
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_path = p;
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_displayName = lastPathComponent(_path);
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if (verify) {
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setFlags();
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}
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}
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AbstractFilesystemNode *POSIXFilesystemNode::getChild(const String &n) const {
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// FIXME: Pretty lame implementation! We do no error checking to speak
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// of, do not check if this is a special node, etc.
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assert(_isDirectory);
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String newPath(_path);
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if (_path.lastChar() != '/')
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newPath += '/';
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newPath += n;
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return new POSIXFilesystemNode(newPath, true);
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}
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bool POSIXFilesystemNode::getChildren(AbstractFSList &myList, ListMode mode, bool hidden) const {
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assert(_isDirectory);
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DIR *dirp = opendir(_path.c_str());
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struct dirent *dp;
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if (dirp == NULL)
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return false;
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// loop over dir entries using readdir
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while ((dp = readdir(dirp)) != NULL) {
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// Skip 'invisible' files if necessary
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if (dp->d_name[0] == '.' && !hidden) {
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continue;
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}
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// Skip '.' and '..' to avoid cycles
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if ((dp->d_name[0] == '.' && dp->d_name[1] == 0) || (dp->d_name[0] == '.' && dp->d_name[1] == '.')) {
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continue;
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}
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String newPath(_path);
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if (newPath.lastChar() != '/')
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newPath += '/';
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newPath += dp->d_name;
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POSIXFilesystemNode entry(newPath, false);
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#if defined(SYSTEM_NOT_SUPPORTING_D_TYPE)
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/* TODO: d_type is not part of POSIX, so it might not be supported
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* on some of our targets. For those systems where it isn't supported,
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* add this #elif case, which tries to use stat() instead.
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*
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* The d_type method is used to avoid costly recurrent stat() calls in big
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* directories.
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*/
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entry.setFlags();
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#else
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if (dp->d_type == DT_UNKNOWN) {
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// Fall back to stat()
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entry.setFlags();
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} else {
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entry._isValid = (dp->d_type == DT_DIR) || (dp->d_type == DT_REG) || (dp->d_type == DT_LNK);
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if (dp->d_type == DT_LNK) {
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struct stat st;
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if (stat(entry._path.c_str(), &st) == 0)
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entry._isDirectory = S_ISDIR(st.st_mode);
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else
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entry._isDirectory = false;
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} else {
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entry._isDirectory = (dp->d_type == DT_DIR);
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}
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}
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#endif
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// Skip files that are invalid for some reason (e.g. because we couldn't
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// properly stat them).
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if (!entry._isValid)
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continue;
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// Honor the chosen mode
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if ((mode == FilesystemNode::kListFilesOnly && entry._isDirectory) ||
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(mode == FilesystemNode::kListDirectoriesOnly && !entry._isDirectory))
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continue;
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if (entry._isDirectory)
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entry._path += "/";
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myList.push_back(new POSIXFilesystemNode(entry));
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}
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closedir(dirp);
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return true;
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}
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AbstractFilesystemNode *POSIXFilesystemNode::getParent() const {
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if (_path == "/")
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return 0;
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const char *start = _path.c_str();
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const char *end = lastPathComponent(_path);
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return new POSIXFilesystemNode(String(start, end - start), true);
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}
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#endif //#if defined(UNIX)
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