Set file sizes to -1 before creating the file reader

integration_tests/resume_test.sh

@@ -11,8 +11,9 @@ ${DUPLICACY} init integration-tests $TEST_STORAGE -c  4
 # Create 10 small files
 add_file file1 20
 add_file file2 20
-add_file file3 20
+rm file3; touch file3
 add_file file4 20
+chmod u-r file4
 add_file file5 20
 add_file file6 20
 add_file file7 20

integration_tests/test.sh

@@ -10,6 +10,7 @@ backup
 add_file file3
 backup
 add_file file4
+chmod u-r ${TEST_REPO}/file4
 backup
 add_file file5
 restore

src/duplicacy_backupmanager.go

@@ -361,14 +361,16 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
     var uploadedChunkLengths []int
     var uploadedChunkLock = &sync.Mutex{}
 
-    // the file reader implements the Reader interface. When an EOF is encounter, it opens the next file unless it
-    // is the last file.
-    fileReader := CreateFileReader(shadowTop, modifiedEntries)
-    // Set all file sizes to -1 to indicate they haven't been processed
+    // Set all file sizes to -1 to indicate they haven't been processed.   This must be done before creating the file 
+    // reader because the file reader may skip inaccessible files on construction.
     for _, entry := range modifiedEntries {
         entry.Size = -1
     }
 
+    // the file reader implements the Reader interface. When an EOF is encounter, it opens the next file unless it
+    // is the last file.
+    fileReader := CreateFileReader(shadowTop, modifiedEntries)
+
     startUploadingTime := time.Now().Unix()
 
     lastUploadingTime := time.Now().Unix()