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DependentExtensions/cat/io/Settings.hpp

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+/*
+	Copyright (c) 2009-2010 Christopher A. Taylor.  All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are met:
+
+	* Redistributions of source code must retain the above copyright notice,
+	  this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above copyright notice,
+	  this list of conditions and the following disclaimer in the documentation
+	  and/or other materials provided with the distribution.
+	* Neither the name of LibCat nor the names of its contributors may be used
+	  to endorse or promote products derived from this software without
+	  specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+	ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+	POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef CAT_SETTINGS_HPP
+#define CAT_SETTINGS_HPP
+
+#include <cat/Singleton.hpp>
+#include <cat/threads/Mutex.hpp>
+#include <fstream>
+
+namespace cat {
+
+
+enum SettingsValueFlags
+{
+    CAT_SETTINGS_FILLED = 1, // s[] array has been set
+    CAT_SETTINGS_INT = 2,    // value has been promoted to int 'i'
+};
+
+struct SettingsValue
+{
+    u8 flags;    // sum of SettingsValueFlags
+    char s[256]; // always nul-terminated
+    int i;
+};
+
+
+class SettingsKey
+{
+public:
+    SettingsKey(SettingsKey *lnode, SettingsKey *gnode, const char *name);
+    ~SettingsKey();
+
+public:
+    SettingsKey *lnode, *gnode;
+
+    char name[64]; // not necessarily nul-terminated
+
+    SettingsValue value;
+
+public:
+    void write(std::ofstream &file);
+};
+
+
+// User settings manager
+class Settings : public Singleton<Settings>
+{
+    CAT_SINGLETON(Settings);
+
+	Mutex _lock;
+
+protected:
+	static const u32 KEY_HASH_SALT = 0xbaddecaf;
+    static const int SETTINGS_HASH_BINS = 256;
+
+    SettingsKey *hbtrees[SETTINGS_HASH_BINS]; // hash table of binary trees
+
+    bool readSettings; // Flag set when settings have been read from disk
+    bool modified;     // Flag set when settings have been modified since last write
+
+	std::string _settings_file;
+
+protected:
+    SettingsKey *addKey(const char *name);
+    SettingsKey *getKey(const char *name);
+
+    SettingsKey *initInt(const char *name, int n, bool overwrite);
+    SettingsKey *initStr(const char *name, const char *value, bool overwrite);
+
+    void clear();
+    
+public:
+    void readSettingsFromFile(const char *file_path = "settings.txt", const char *override_file = "override.txt");
+    void readSettingsFromBuffer(const char *data, int len);
+    void write();
+
+public:
+    int getInt(const char *name);
+    const char *getStr(const char *name);
+
+    int getInt(const char *name, int init);
+    const char *getStr(const char *name, const char *init);
+
+    void setInt(const char *name, int n);
+    void setStr(const char *name, const char *value);
+};
+
+
+} // namespace cat
+
+#endif // CAT_SETTINGS_HPP