From 8f09789d4095245bbf43e3de0baeda92262085c4 Mon Sep 17 00:00:00 2001
From: Claude Paroz <claude@2xlibre.net>
Date: Sat, 19 Oct 2019 17:37:56 +0200
Subject: [PATCH] [csv] Fixes #342 - Feed only 1k of content to csv.Sniffer

Thanks Rivo Laks for the suggestion.
---
 src/tablib/formats/_csv.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tablib/formats/_csv.py b/src/tablib/formats/_csv.py
index f4c1699..975d171 100644
--- a/src/tablib/formats/_csv.py
+++ b/src/tablib/formats/_csv.py
@@ -52,7 +52,7 @@ def import_set(dset, in_stream, headers=True, **kwargs):
 def detect(stream, delimiter=DEFAULT_DELIMITER):
     """Returns True if given stream is valid CSV."""
     try:
-        csv.Sniffer().sniff(stream, delimiters=delimiter)
+        csv.Sniffer().sniff(stream[:1024], delimiters=delimiter)
         return True
     except Exception:
         return False