From fdfefdd3015f86bc69bc442644b8241c72a30120 Mon Sep 17 00:00:00 2001
From: Dhanu Saputra <35093673+dhanusaputra@users.noreply.github.com>
Date: Wed, 23 Feb 2022 23:30:00 +0700
Subject: [PATCH] More accurate detection for Shapefile (#253)

More accurate detection for Shapefile
---
 internal/magic/geo.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/internal/magic/geo.go b/internal/magic/geo.go
index 6df419e..f077e16 100644
--- a/internal/magic/geo.go
+++ b/internal/magic/geo.go
@@ -11,6 +11,17 @@ func Shp(raw []byte, limit uint32) bool {
 	if len(raw) < 112 {
 		return false
 	}
+
+	if !(binary.BigEndian.Uint32(raw[0:4]) == 9994 &&
+		binary.BigEndian.Uint32(raw[4:8]) == 0 &&
+		binary.BigEndian.Uint32(raw[8:12]) == 0 &&
+		binary.BigEndian.Uint32(raw[12:16]) == 0 &&
+		binary.BigEndian.Uint32(raw[16:20]) == 0 &&
+		binary.BigEndian.Uint32(raw[20:24]) == 0 &&
+		binary.LittleEndian.Uint32(raw[28:32]) == 1000) {
+		return false
+	}
+
 	shapeTypes := []int{
 		0,  // Null shape
 		1,  // Point