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diff --git a/src/base_media_base.h b/src/base_media_base.h
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@@ -0,0 +1,193 @@
+/* $Id$ */
+
+/** @file base_media_base.h Generic functions for replacing base data (graphics, sounds). */
+
+#ifndef BASE_MEDIA_BASE_H
+#define BASE_MEDIA_BASE_H
+
+#include "fileio_func.h"
+
+/** Structure holding filename and MD5 information about a single file */
+struct MD5File {
+	const char *filename;        ///< filename
+	uint8 hash[16];              ///< md5 sum of the file
+	const char *missing_warning; ///< warning when this file is missing
+
+	bool CheckMD5() const;
+};
+
+/**
+ * Information about a single base set.
+ * @tparam T the real class we're going to be
+ * @tparam Tnum_files the number of files in the set
+ */
+template <class T, size_t Tnum_files>
+struct BaseSet {
+	/** Number of files in this set */
+	static const size_t NUM_FILES = Tnum_files;
+
+	/** Internal names of the files in this set. */
+	static const char *file_names[Tnum_files];
+
+	const char *name;          ///< The name of the base set
+	const char *description;   ///< Description of the base set
+	uint32 shortname;          ///< Four letter short variant of the name
+	uint32 version;            ///< The version of this base set
+
+	MD5File files[NUM_FILES];  ///< All files part of this set
+	uint found_files;          ///< Number of the files that could be found
+
+	T *next;                   ///< The next base set in this list
+
+	/** Free everything we allocated */
+	~BaseSet()
+	{
+		free((void*)this->name);
+		free((void*)this->description);
+		for (uint i = 0; i < NUM_FILES; i++) {
+			free((void*)this->files[i].filename);
+			free((void*)this->files[i].missing_warning);
+		}
+
+		delete this->next;
+	}
+
+	/**
+	 * Get the number of missing files.
+	 * @return the number
+	 */
+	int GetNumMissing() const
+	{
+		return Tnum_files - this->found_files;
+	}
+
+	/**
+	 * Read the set information from a loaded ini.
+	 * @param ini      the ini to read from
+	 * @param path     the path to this ini file (for filenames)
+	 * @return true if loading was successful.
+	 */
+	bool FillSetDetails(struct IniFile *ini, const char *path);
+};
+
+/**
+ * Base for all base media (graphics, sound)
+ * @tparam Tbase_set the real set we're going to be
+ */
+template <class Tbase_set>
+class BaseMedia : FileScanner {
+protected:
+	static Tbase_set *available_sets; ///< All available sets
+	static const Tbase_set *used_set; ///< The currently used set
+
+	/* virtual */ bool AddFile(const char *filename, size_t basepath_length);
+
+	/**
+	 * Get the extension that is used to identify this set.
+	 * @return the extension
+	 */
+	static const char *GetExtension();
+public:
+	/** The set as saved in the config file. */
+	static const char *ini_set;
+
+	/**
+	 * Determine the graphics pack that has to be used.
+	 * The one with the most correct files wins.
+	 * @return true if a best set has been found.
+	 */
+	static bool DetermineBestSet();
+
+	/** Do the scan for files. */
+	static uint FindSets()
+	{
+		BaseMedia<Tbase_set> fs;
+		return fs.Scan(GetExtension(), DATA_DIR);
+	}
+
+	/**
+	 * Set the set to be used.
+	 * @param name of the set to use
+	 * @return true if it could be loaded
+	 */
+	static bool SetSet(const char *name);
+
+	/**
+	 * Returns a list with the sets.
+	 * @param p    where to print to
+	 * @param last the last character to print to
+	 * @return the last printed character
+	 */
+	static char *GetSetsList(char *p, const char *last);
+
+	/**
+	 * Count the number of available graphics sets.
+	 * @return the number of sets
+	 */
+	static int GetNumSets();
+
+	/**
+	 * Get the index of the currently active graphics set
+	 * @return the current set's index
+	 */
+	static int GetIndexOfUsedSet();
+
+	/**
+	 * Get the name of the graphics set at the specified index
+	 * @return the name of the set
+	 */
+	static const Tbase_set *GetSet(int index);
+	/**
+	 * Return the used set.
+	 * @return the used set.
+	 */
+	static const Tbase_set *GetUsedSet();
+
+	/**
+	 * Check whether we have an set with the exact characteristics as ci.
+	 * @param ci the characteristics to search on (shortname and md5sum)
+	 * @param md5sum whether to check the MD5 checksum
+	 * @return true iff we have an set matching.
+	 */
+	static bool HasSet(const struct ContentInfo *ci, bool md5sum);
+};
+
+
+/** Types of graphics in the base graphics set */
+enum GraphicsFileType {
+	GFT_BASE,     ///< Base sprites for all climates
+	GFT_LOGOS,    ///< Logos, landscape icons and original terrain generator sprites
+	GFT_ARCTIC,   ///< Landscape replacement sprites for arctic
+	GFT_TROPICAL, ///< Landscape replacement sprites for tropical
+	GFT_TOYLAND,  ///< Landscape replacement sprites for toyland
+	GFT_EXTRA,    ///< Extra sprites that were not part of the original sprites
+	MAX_GFT       ///< We are looking for this amount of GRFs
+};
+
+/** All data of a graphics set. */
+struct GraphicsSet : BaseSet<GraphicsSet, MAX_GFT> {
+	PaletteType palette;       ///< Palette of this graphics set
+
+	/**
+	 * Is this set useable? Are enough files found to think it exists.
+	 * @return true if it's useable.
+	 */
+	bool IsUseable() const
+	{
+		/* Do not find 'only' openttd[dw].grf */
+		return this->found_files > 1;
+	}
+
+	bool FillSetDetails(struct IniFile *ini, const char *path);
+};
+
+/** All data/functions related with replacing the base graphics. */
+class BaseGraphics : public BaseMedia<GraphicsSet> {
+public:
+	/**
+	 * Determine the palette of the current graphics set.
+	 */
+	static void DeterminePalette();
+};
+
+#endif /* BASE_MEDIA_BASE_H */