filter: implement basic analysis of urls

Analysing of the url host part, some simple tests. Not usable as
squid filter yet.

1 files changed, 3 insertions, 1 deletions

diff --git a/blob.h b/blob.h
index 883c053..767e661 100644
--- a/blob.h
+++ b/blob.h
@@ -31,7 +31,7 @@ extern const blob_t BLOB_NULL;
 
 static inline int blob_is_null(blob_t b)
 {
-	return b.ptr == NULL;
+	return b.len == 0;
 }
 
 char *blob_cstr_dup(blob_t b);
@@ -47,4 +47,6 @@ int blob_pull_matching(blob_t *b, blob_t e);
 unsigned int blob_pull_uint(blob_t *b, int radix);
 blob_t blob_pull_cspn(blob_t *b, const blob_t cspn);
 
+blob_t blob_expand_head(blob_t *b, blob_t limits, unsigned char sep);
+
 #endif