util-file: change file size computation

The file size returned by FileSize is invalid if file store is not
used so we introduce a new size field in File structure that is used
to store the size.

src/util-file.c

@@ -565,6 +565,8 @@ int FileAppendData(FileContainer *ffc, const uint8_t *data, uint32_t data_len)
         SCReturnInt(-1);
     }
 
+    ffc->tail->size += data_len;
+
     if (ffc->tail->state != FILE_STATE_OPENED) {
         if (ffc->tail->flags & FILE_NOSTORE) {
             SCReturnInt(-2);
@@ -699,6 +701,7 @@ File *FileOpenFile(FileContainer *ffc, const StreamingBufferConfig *sbcfg,
     FileContainerAdd(ffc, ff);
 
     if (data != NULL) {
+        ff->size += data_len;
         if (AppendData(ff, data, data_len) != 0) {
             ff->state = FILE_STATE_ERROR;
             SCReturnPtr(NULL, "File");
@@ -723,6 +726,7 @@ static int FileCloseFilePtr(File *ff, const uint8_t *data,
     }
 
     if (data != NULL) {
+        ff->size += data_len;
         if (ff->flags & FILE_NOSTORE) {
 #ifdef HAVE_NSS
             /* no storage but hashing */

src/util-file.h

@@ -82,6 +82,7 @@ typedef struct File_ {
     uint64_t content_inspected;     /**< used in pruning if FILE_USE_DETECT
                                      *   flag is set */
     uint64_t content_stored;
+    uint64_t size;
 } File;
 
 typedef struct FileContainer_ {