added API definitions for stream library

diff --git a/src/include/gnunet_stream_lib.h b/src/include/gnunet_stream_lib.h
new file mode 100644 (file)
index 0000000..f693507
--- /dev/null
+++ b/src/include/gnunet_stream_lib.h
@@ -0,0 +1,180 @@
+/*
+     This file is part of GNUnet.
+     (C) 2011, Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file include/gnunet_stream_lib.h
+ * @brief stream handling using mesh API
+ * @author Sree Harsha Totakura
+ */
+
+#ifndef GNUNET_STREAM_LIB_H_
+#define GNUNET_STREAM_LIB_H_
+
+#ifdef __cplusplus
+extern "C" 
+{
+#if 0
+}
+#endif
+#endif
+
+#include "gnunet_util_lib.h"
+#include "gnunet_mesh_service.h"
+
+/**
+ * Stream status 
+ */
+enum GNUNET_STREAM_Status
+  {
+    /**
+     * All previous read/write operations are successfully done
+     */
+    GNUNET_STREAM_OK = 0,
+
+    /**
+     * A timeout occured while reading/writing the stream
+     */
+    GNUNET_STREAM_TIMEOUT = 1,
+
+    /**
+     * A serious error occured while operating of this stream
+     */
+    GNUNET_STREAM_SYSERR = 2
+  };
+
+/**
+ * Opaque handler for stream
+ */
+struct GNUNET_STREAM_socket;
+
+/**
+ * Functions of this type will be called when a stream is established
+ *
+ * @param cls the closure from GNUNET_STREAM_open
+ */
+typedef void (*GNUNET_STREAM_OpenCallback) (void *cls);
+
+/**
+ * Tries to open a stream to the target peer
+ *
+ * @param cls the closure
+ * @param target the target peer to which the stream has to be opened
+ * @param app_port the application port number which uniquely identifies this
+ *            stream
+ * @param open_cb this function will be called after stream has be established 
+ * @return if successful it returns the stream socket; NULL if stream cannot be
+ *         opened 
+ */
+struct GNUNET_STREAM_socket *
+GNUNET_STREAM_open (void *cls,
+                    const struct GNUNET_PeerIdentity *target,
+                    GNUNET_MESH_ApplicationType app_port,
+                    GNUNET_STREAM_OpenCallback open_cb);
+
+/**
+ * Functions of this type are called upon new stream connection from other peers
+ *
+ * @param cls the closure from GNUNET_STREAM_listen
+ * @param socket the socket representing the stream
+ * @param initiator the identity of the peer who wants to establish a stream
+ *            with us
+ * @return GNUNET_OK to keep the socket open, GNUNET_SYSERR to close the
+ *             stream (the socket will be invalid after the call)
+ */
+typedef int (*GNUNET_STREAM_ListenCallback) (void *cls,
+                                             struct GNUNET_STREAM_socket *socket,
+                                             const struct 
+                                             GNUNET_PeerIdentity *initiator);
+
+/**
+ * Listens for stream connections for a specific application ports
+ *
+ * @param app_port the application port for which new streams will be accepted
+ * @param listen_cb this function will be called when a peer tries to establish
+ *            a stream with us
+ * @return GNUNET_OK if we are listening, GNUNET_SYSERR for any error
+ */
+int
+GNUNET_STREAM_listen (GNUNET_MESH_ApplicationType app_port,
+                      GNUNET_STREAM_ListenCallback listen_cb,
+                      void *cls);
+
+/**
+ * Functions of this signature are called whenever reading/writing operations
+ * on a stream are executed
+ *
+ * @param cls the closure from GNUNET_STREAM_write/read
+ * @param status the status of the stream at the time this function is called
+ * @param size the number of bytes read or written
+ */
+typedef void (*GNUNET_STREAM_CompletionCallback) (void *cls,
+                                                  enum GNUNET_STREAM_Status
+                                                  status,
+                                                  size_t size);
+
+/**
+ * Tries to write the given data to the stream
+ *
+ * @param socket the socket representing a stream
+ * @param data the data buffer from where the data is written into the stream
+ * @param size the number of bytes to be written from the data buffer
+ * @param write_cb the function to call upon writing some bytes into the stream
+ * @param timeout the timeout period
+ * @param cls the closure
+ */
+void
+GNUNET_STREAM_write (const struct GNUNET_STREAM_socket *socket,
+                     void *data,
+                     size_t size,
+                     GNUNET_STREAM_CompletionCallback write_cb,
+                     struct GNUNET_TIME_Relative timeout,
+                     void *cls);
+
+/**
+ * Tries to read data from the stream
+ *
+ * @param socket the socket representing a stream
+ * @param buffer the buffer into which the read data is stored
+
+ * @return 
+ */
+size_t
+GNUNET_STREAM_read (const struct GNUNET_STREAM_socket *socket,
+                    void *buffer,
+                    size_t size,
+                    GNUNET_STREAM_CompletionCallback read_cb,
+                    struct GNUNET_TIME_Relative timeout,
+                    void *cls);
+/**
+ * Closes the stream
+ *
+ * @param socket the stream socket
+ */
+void
+GNUNET_STREAM_close (struct GNUNET_STREAM_socket *socket);
+
+#if 0
+{
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+#endif

diff --git a/src/stream/README b/src/stream/README
new file mode 100644 (file)
index 0000000..9b550b0
--- /dev/null
+++ b/src/stream/README
@@ -0,0 +1,11 @@
+The aim of the stream library is to provide stream connections between peers in
+GNUnet. This is a convenience library which hides the complexity of dividing
+data stream into packets, transmitting them and retransmitting them in case of
+errors.
+
+This library's API are similar to unix PIPE API. The user is expected to open a
+stream to a listening target peer. Once the stream is established, the user can
+use it as a pipe. Any data written into the stream will be readable by the
+target peer.
+
+This library uses mesh API for establishing streams between peers.
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