From 00c704fa414fd74026d771150e57a3d30c939b10 Mon Sep 17 00:00:00 2001
From: Magnus Lundborg <magnus.lundborg@scilifelab.se>
Date: Tue, 22 Jan 2013 13:08:48 +0100
Subject: Bug fix (file pos wrong when writing sparse frame data).


diff --git a/src/lib/tng_io.c b/src/lib/tng_io.c
index 7f01dca..94bf67a 100644
--- a/src/lib/tng_io.c
+++ b/src/lib/tng_io.c
@@ -8940,8 +8940,8 @@ tng_function_status tng_frame_data_write(tng_trajectory_t tng_data,
 
     n_values_per_frame = data.n_values_per_frame;
 
-    file_pos = (frame_nr - (frame_set->first_frame +
-                            data.first_frame_with_data)) /
+    file_pos = (frame_nr - max(frame_set->first_frame,
+                               data.first_frame_with_data)) /
                 data.stride_length;
     file_pos *= size * n_values_per_frame;
 
@@ -9419,8 +9419,8 @@ tng_function_status tng_frame_particle_data_write(tng_trajectory_t tng_data,
 
     n_values_per_frame = data.n_values_per_frame;
 
-    file_pos = (frame_nr - (frame_set->first_frame +
-                            data.first_frame_with_data)) /
+    file_pos = (frame_nr - max(frame_set->first_frame,
+                               data.first_frame_with_data)) /
                 data.stride_length;
     file_pos *= block_n_particles * size * n_values_per_frame;
 
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