From f692c39ac793ed999d47d29fd2306910403ad06a Mon Sep 17 00:00:00 2001
From: Dirk Hohndel <dirk@hohndel.org>
Date: Mon, 12 May 2014 00:45:52 -0700
Subject: [PATCH] Uemis downloader: fix corner case

When we first get an invalid dive info and then, once we decremented the
offset, get a valid one but for the wrong dive and then try to calculate
the correct offset, we need to keep the existing offset in mind.

What a horrid design. Thanks, UEMIS.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
---
 uemis-downloader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/uemis-downloader.c b/uemis-downloader.c
index c1980de4c..16bba7b27 100644
--- a/uemis-downloader.c
+++ b/uemis-downloader.c
@@ -919,7 +919,7 @@ const char *do_uemis_import(const char *mountpath, short force_download)
 				if (divenr == -1) {
 					offset--;
 				} else {
-					offset = i - divenr;
+					offset += i - divenr;
 				}
 #if UEMIS_DEBUG & 2
 				fprintf(debugfile, " -> trying again with offset %d\n", offset);