Introduce the vss task.
[paraslash.git] / afh.c
diff --git a/afh.c b/afh.c
index 86f34ac..dd69d9e 100644 (file)
--- a/afh.c
+++ b/afh.c
@@ -64,18 +64,26 @@ static int cat_file(void *audio_file_data, struct afh_info *afhi)
        size_t size;
 
 
-       if (conf.begin_chunk_arg < 0)
-               return -ERRNO_TO_PARA_ERROR(EINVAL);
-       first_chunk = conf.begin_chunk_arg;
-
-       if (conf.end_chunk_given) {
-               if (conf.end_chunk_arg < 0)
-                       return -ERRNO_TO_PARA_ERROR(EINVAL);
-               if (conf.end_chunk_arg >= afhi->chunks_total)
+       if (conf.begin_chunk_arg < 0) {
+               if (-conf.begin_chunk_arg > afhi->chunks_total)
                        return -ERRNO_TO_PARA_ERROR(EINVAL);
-               last_chunk = conf.end_chunk_arg;
+               first_chunk = afhi->chunks_total + conf.begin_chunk_arg;
+       } else
+               first_chunk = conf.begin_chunk_arg;
+       if (conf.end_chunk_given) {
+               if (conf.end_chunk_arg < 0) {
+                       if (-conf.end_chunk_arg > afhi->chunks_total)
+                               return -ERRNO_TO_PARA_ERROR(EINVAL);
+                       last_chunk = afhi->chunks_total + conf.end_chunk_arg;
+               } else {
+                       if (conf.end_chunk_arg >= afhi->chunks_total)
+                               return -ERRNO_TO_PARA_ERROR(EINVAL);
+                       last_chunk = conf.end_chunk_arg;
+               }
        } else
                last_chunk = afhi->chunks_total - 1;
+       if (first_chunk >= last_chunk)
+               return -ERRNO_TO_PARA_ERROR(EINVAL);
        if (!afhi->chunks_total)
                return 1;
        afh_get_header(afhi, audio_file_data, &buf, &size);