1 files changed, 96 insertions, 0 deletions
diff --git a/src/oldpool.h b/src/oldpool.h
new file mode 100644
index 000000000..ba22e4ef4
--- /dev/null
+++ b/src/oldpool.h
@@ -0,0 +1,96 @@
+/* $Id$ */
+
+#ifndef OLDPOOL_H
+#define OLDPOOL_H
+
+typedef struct OldMemoryPool OldMemoryPool;
+
+/* The function that is called after a new block is added
+     start_item is the first item of the new made block */
+typedef void OldMemoryPoolNewBlock(uint start_item);
+/* The function that is called before a block is cleaned up */
+typedef void OldMemoryPoolCleanBlock(uint start_item, uint end_item);
+
+/**
+ * Stuff for dynamic vehicles. Use the wrappers to access the OldMemoryPool
+ *  please try to avoid manual calls!
+ */
+struct OldMemoryPool {
+	const char* const name;     ///< Name of the pool (just for debugging)
+
+	const uint max_blocks;      ///< The max amount of blocks this pool can have
+	const uint block_size_bits; ///< The size of each block in bits
+	const uint item_size;       ///< How many bytes one block is
+
+	/// Pointer to a function that is called after a new block is added
+	OldMemoryPoolNewBlock *new_block_proc;
+	/// Pointer to a function that is called to clean a block
+	OldMemoryPoolCleanBlock *clean_block_proc;
+
+	uint current_blocks;        ///< How many blocks we have in our pool
+	uint total_items;           ///< How many items we now have in this pool
+
+	byte **blocks;              ///< An array of blocks (one block hold all the items)
+};
+
+/**
+ * Those are the wrappers:
+ *   CleanPool cleans the pool up, but you can use AddBlockToPool directly again
+ *     (no need to call CreatePool!)
+ *   AddBlockToPool adds 1 more block to the pool. Returns false if there is no
+ *     more room
+ */
+void CleanPool(OldMemoryPool *array);
+bool AddBlockToPool(OldMemoryPool *array);
+
+/**
+ * Adds blocks to the pool if needed (and possible) till index fits inside the pool
+ *
+ * @return Returns false if adding failed
+ */
+bool AddBlockIfNeeded(OldMemoryPool *array, uint index);
+
+
+#define OLD_POOL_ENUM(name, type, block_size_bits, max_blocks) \
+	enum { \
+		name##_POOL_BLOCK_SIZE_BITS = block_size_bits, \
+		name##_POOL_MAX_BLOCKS      = max_blocks \
+	};
+
+
+#define OLD_POOL_ACCESSORS(name, type) \
+	static inline type* Get##name(uint index) \
+	{ \
+		assert(index < _##name##_pool.total_items); \
+		return (type*)( \
+			_##name##_pool.blocks[index >> name##_POOL_BLOCK_SIZE_BITS] + \
+			(index & ((1 << name##_POOL_BLOCK_SIZE_BITS) - 1)) * sizeof(type) \
+		); \
+	} \
+\
+	static inline uint Get##name##PoolSize(void) \
+	{ \
+		return _##name##_pool.total_items; \
+	}
+
+
+#define DECLARE_OLD_POOL(name, type, block_size_bits, max_blocks) \
+	OLD_POOL_ENUM(name, type, block_size_bits, max_blocks) \
+	extern OldMemoryPool _##name##_pool; \
+	OLD_POOL_ACCESSORS(name, type)
+
+
+#define DEFINE_OLD_POOL(name, type, new_block_proc, clean_block_proc) \
+	OldMemoryPool _##name##_pool = { \
+		#name, name##_POOL_MAX_BLOCKS, name##_POOL_BLOCK_SIZE_BITS, sizeof(type), \
+		new_block_proc, clean_block_proc, \
+		0, 0, NULL \
+	};
+
+
+#define STATIC_OLD_POOL(name, type, block_size_bits, max_blocks, new_block_proc, clean_block_proc) \
+	OLD_POOL_ENUM(name, type, block_size_bits, max_blocks) \
+	static DEFINE_OLD_POOL(name, type, new_block_proc, clean_block_proc) \
+	OLD_POOL_ACCESSORS(name, type)
+
+#endif /* OLDPOOL_H */