From fcd6cc91d83610bd72e460b54f11f66daf1b67eb Mon Sep 17 00:00:00 2001
From: Nuno Cruces <ncruces@users.noreply.github.com>
Date: Mon, 27 Nov 2023 23:35:43 +0000
Subject: [PATCH] Skip BOM.

---
 ext/csv/csv.go      | 13 ++++++++++++-
 ext/csv/csv_test.go |  2 +-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/ext/csv/csv.go b/ext/csv/csv.go
index 1b4a214..48c2234 100644
--- a/ext/csv/csv.go
+++ b/ext/csv/csv.go
@@ -85,6 +85,7 @@ func RegisterOpen(db *sqlite3.Conn, open func(name string) (io.ReaderAt, error))
 			r:      r,
 			comma:  comma,
 			header: header,
+			bom:    -1,
 		}
 		defer func() {
 			if err != nil {
@@ -119,6 +120,7 @@ type table struct {
 	r      io.ReaderAt
 	comma  rune
 	header bool
+	bom    int8
 }
 
 func (t *table) Close() error {
@@ -151,7 +153,16 @@ func (t *table) Integrity(schema, table string, flags int) (err error) {
 }
 
 func (t *table) newReader() *csv.Reader {
-	csv := csv.NewReader(io.NewSectionReader(t.r, 0, math.MaxInt64))
+	if t.bom < 0 {
+		var bom [3]byte
+		t.r.ReadAt(bom[:], 0)
+		if string(bom[:]) == "\xEF\xBB\xBF" {
+			t.bom = 3
+		} else {
+			t.bom = 0
+		}
+	}
+	csv := csv.NewReader(io.NewSectionReader(t.r, int64(t.bom), math.MaxInt64))
 	csv.ReuseRecord = true
 	csv.Comma = t.comma
 	return csv
diff --git a/ext/csv/csv_test.go b/ext/csv/csv_test.go
index 3beea74..c9bfe62 100644
--- a/ext/csv/csv_test.go
+++ b/ext/csv/csv_test.go
@@ -59,7 +59,7 @@ func TestRegister(t *testing.T) {
 
 	csv.Register(db)
 
-	const data = `
+	const data = "\xEF\xBB\xBF" + `
 "Rob"	"Pike"	rob
 "Ken"	Thompson	ken
 Robert	"Griesemer"	"gri"`