cpw.qulogic.msnp16: 73551b36: Shuffle some things around and add some ...

[markdoliner at pidgin.im]

-----------------------------------------------------------------
Revision: 73551b36d48cb0819a5648c155525b08a1db41f5
Ancestor: c7061cdd4aa014510ae344d29a088102c9d95eb7
Author: markdoliner at pidgin.im
Date: 2010-02-08T08:18:20
Branch: im.pidgin.cpw.qulogic.msnp16
URL: http://d.pidgin.im/viewmtn/revision/info/73551b36d48cb0819a5648c155525b08a1db41f5

Modified files:
        libpurple/protocols/msn/cmdproc.c

ChangeLog: 

Shuffle some things around and add some comments.  Hopefully cleaner.

-------------- next part --------------
============================================================
--- libpurple/protocols/msn/cmdproc.c	098ade4cde1b92dc4c6fa44b2eda7fb01d5e7b85
+++ libpurple/protocols/msn/cmdproc.c	96ba9eae5082f50237290155292346eaa68cf876
@@ -248,6 +248,8 @@ msn_cmdproc_process_msg(MsnCmdProc *cmdp
 	/* Multi-part messages */
 	message_id = msn_message_get_header_value(msg, "Message-ID");
 	if (message_id != NULL) {
+		/* This is the first in a series of chunks */
+
 		const char *chunk_text = msn_message_get_header_value(msg, "Chunks");
 		guint chunk;
 		if (chunk_text != NULL) {
@@ -269,31 +271,41 @@ msn_cmdproc_process_msg(MsnCmdProc *cmdp
 		} else {
 			chunk_text = msn_message_get_header_value(msg, "Chunk");
 			if (chunk_text != NULL) {
+				/* This is one chunk in a series of chunks */
+
 				MsnMessage *first = g_hash_table_lookup(cmdproc->multiparts, message_id);
 				chunk = strtol(chunk_text, NULL, 10);
 				if (first == NULL) {
 					purple_debug_error("msn",
 					                   "Unable to find first chunk of message_id '%s' to correspond with chunk %d.\n",
-					                   message_id, chunk+1);
-				} else if (first->received_chunks == chunk) {
-					/* Chunk is from 1 to total-1 (doesn't count first one) */
-					purple_debug_info("msn", "Received chunk %d of %d, message_id: '%s'\n",
-					                  chunk+1, first->total_chunks, message_id);
-					first->body = g_realloc(first->body, first->body_len + msg->body_len);
-					memcpy(first->body + first->body_len, msg->body, msg->body_len);
-					first->body_len += msg->body_len;
-					first->received_chunks++;
-					if (first->received_chunks != first->total_chunks)
-						return;
-					else
-						/* We're done! Send it along... The caller takes care of
-						   freeing the old one. */
-						msg = first;
-				} else {
-					/* TODO: Can you legitimately receive chunks out of order? */
+					                   message_id, chunk + 1);
+				} else if (first->received_chunks != chunk) {
+					/*
+					 * We received an out of order chunk number (i.e. not the
+					 * next one in the sequence).  Not sure if this can happen
+					 * legitimately, but we definitely don't handle it right
+					 * now.
+					 */
 					g_hash_table_remove(cmdproc->multiparts, message_id);
 					return;
 				}
+
+				/* Chunk is from 1 to total-1 (doesn't count first one) */
+				purple_debug_info("msn", "Received chunk %d of %d, message_id: '%s'\n",
+						chunk + 1, first->total_chunks, message_id);
+				first->body = g_realloc(first->body, first->body_len + msg->body_len);
+				memcpy(first->body + first->body_len, msg->body, msg->body_len);
+				first->body_len += msg->body_len;
+				first->received_chunks++;
+				if (first->received_chunks != first->total_chunks)
+					/* We're waiting for more chunks */
+					return;
+
+				/*
+				 * We have all the chunks for this message, great!  Send
+				 * it along... The caller takes care of freeing the old one.
+				 */
+				msg = first;
 			} else {
 				purple_debug_error("msn", "Received MessageId '%s' with no chunk number!\n", message_id);
 			}