1 files changed, 30 insertions, 0 deletions
diff --git a/src/etag.c b/src/etag.c
new file mode 100644
index 00000000..eb1b2f41
--- /dev/null
+++ b/src/etag.c
@@ -0,0 +1,30 @@
+#include <string.h>
+
+#include "buffer.h"
+#include "etag.h"
+
+int etag_is_equal(buffer *etag, const char *matches) {
+	if (0 == strcmp(etag->ptr, matches)) return 1;
+	return 0;
+}
+
+int etag_create(buffer *etag, struct stat *st) {
+	buffer_copy_off_t(etag, st->st_ino);
+	buffer_append_string_len(etag, "-", 1);
+	buffer_append_off_t(etag, st->st_size);
+	buffer_append_string_len(etag, "-", 1);
+	buffer_append_long(etag, st->st_mtime);
+	
+	return 0;
+}
+
+int etag_mutate(buffer *mut, buffer *etag) {
+	size_t h, i;
+	
+	for (h=0, i=0; i < etag->used; ++i) h = (h<<5)^(h>>27)^(etag->ptr[i]);
+	
+	buffer_reset(mut);
+	buffer_copy_long(mut, h);
+	
+	return 0;
+}