@@ -7,14 +7,21 @@
  * This file is part of libobjfw. It may be distributed under the terms of the
  * Q Public License 1.0, which can be found in the file LICENSE included in
  * the packaging of this file.
  */
 
+#import "OFObject.h"
+
 /**
- * The OFStream protocol provides functions to read from and write to streams.
+ * The OFStream class provides a base class for different types of streams.
  */
-@protocol OFStream
+@interface OFStream: OFObject
+{
+	char   *cache;
+	size_t cache_len;
+}
+
 /**
  * Reads from the stream into a buffer.
  *
  * \param buf The buffer into which the data is read
  * \param size The size of the data that should be read.
@@ -22,10 +29,20 @@
  * \return The number of bytes read
  */
 - (size_t)readNBytes: (size_t)size
 	  intoBuffer: (char*)buf;
 
+/**
+ * Read until a newline or \0 occurs.
+ *
+ * If you want to use readNBytes afterwards again, you have to clear the cache
+ * before and optionally get the cache before clearing it!
+ *
+ * \return The line that was read. Use freeMem: to free it!
+ */
+- (char*)readLine;
+
 /**
  * Writes from a buffer into the stream.
  *
  * \param buf The buffer from which the data is written to the stream
  * \param size The size of the data that should be written
@@ -40,10 +57,24 @@
  * \param str The C string from which the data is written to the stream
  * \return The number of bytes written
  */
 - (size_t)writeCString: (const char*)str;
 
+/**
+ * Sets a specified pointer to the cache and returns the length of the cache.
+ *
+ * \param ptr A pointer to a pointer. It will be set to the cache.
+ *	      If it is NULL, only the number of bytes in the cache is returned.
+ * \return The number of bytes in the cache.
+ */
+- (size_t)getCache: (char**)ptr;
+
+/**
+ * Clears the cache.
+ */
+- clearCache;
+
 /**
  * Closes the stream.
  */
 - close;
 @end