All data sent and received on channels is const.

diff --git a/src/meshlink++.h b/src/meshlink++.h
index dc32855a212a869e52b77eaf90f2bb016a0bb396..494c6ebda8c7ac406984cae5d0a2da25e1e57a0a 100644 (file)
--- a/src/meshlink++.h
+++ b/src/meshlink++.h
@@ -66,7 +66,7 @@ namespace meshlink {
         *  @return             This function should return true if the application accepts the incoming channel, false otherwise.
         *                      If returning false, the channel is invalid and may not be used anymore.
         */
-       typedef bool (*channel_accept_cb_t)(mesh *mesh, channel *channel, node *node, uint16_t port, void *data, size_t len);
+       typedef bool (*channel_accept_cb_t)(mesh *mesh, channel *channel, node *node, uint16_t port, const void *data, size_t len);
 
        /// A callback for receiving data from a channel.
        /** @param mesh         A handle which represents an instance of MeshLink.
@@ -74,7 +74,7 @@ namespace meshlink {
         *  @param data         A pointer to a buffer containing data sent by the source.
         *  @param len          The length of the data.
         */
-       typedef void (*channel_receive_cb_t)(mesh *mesh, channel *channel, void *data, size_t len);
+       typedef void (*channel_receive_cb_t)(mesh *mesh, channel *channel, const void *data, size_t len);
 
        /// A class describing a MeshLink node.
        class node: public meshlink_node_t {
@@ -317,7 +317,7 @@ namespace meshlink {
                 *
                 *  @return             A handle for the channel, or NULL in case of an error.
                 */
-               channel *channel_open(node *node, uint16_t port, channel_receive_cb_t recv, void *data, size_t len) {
+               channel *channel_open(node *node, uint16_t port, channel_receive_cb_t recv, const void *data, size_t len) {
                        return (channel *)meshlink_channel_open(this, node, port, (meshlink_channel_receive_cb_t)recv, data, len);
                }
 

diff --git a/src/meshlink.h b/src/meshlink.h
index 7bb0da9997955277d7ab4b7707425ffca46d401e..89bab39aba15c5fa4d7c342dfd19f19412eab5cb 100644 (file)
--- a/src/meshlink.h
+++ b/src/meshlink.h
@@ -334,7 +334,7 @@ extern void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node);
  *  @return             This function should return true if the application accepts the incoming channel, false otherwise.
  *                      If returning false, the channel is invalid and may not be used anymore.
  */
-typedef bool (*meshlink_channel_accept_cb_t)(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_node_t *node, uint16_t port, void *data, size_t len);
+typedef bool (*meshlink_channel_accept_cb_t)(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_node_t *node, uint16_t port, const void *data, size_t len);
 
 /// A callback for receiving data from a channel.
 /** This function is called whenever a remote node wants to open a channel to the local node.
@@ -345,7 +345,7 @@ typedef bool (*meshlink_channel_accept_cb_t)(meshlink_handle_t *mesh, meshlink_c
  *  @param data         A pointer to a buffer containing data sent by the source.
  *  @param len          The length of the data.
  */
-typedef void (*meshlink_channel_receive_cb_t)(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *data, size_t len);
+typedef void (*meshlink_channel_receive_cb_t)(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len);
 
 /// Set the accept callback.
 /** This functions sets the callback that is called whenever another node sends data to the local node.
@@ -385,7 +385,7 @@ extern void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_ch
  *
  *  @return             A handle for the channel, or NULL in case of an error.
  */
-extern meshlink_channel_t *meshlink_channel_open(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, void *data, size_t len);
+extern meshlink_channel_t *meshlink_channel_open(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len);
 
 /// Partially close a reliable stream channel.
 /** This shuts down the read or write side of a channel, or both, without closing the handle.
@@ -418,7 +418,7 @@ extern void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *
  *
  *  @return             The amount of data that was queued, which can be less than len, or a negative value in case of an error.
  */
-extern ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *data, size_t len);
+extern ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len);
 
 #ifdef __cplusplus
 }