Skip UTF-8 BOM in binary detection

When a git_buf contains a UTF-8 BOM, the three bytes comprising
that BOM are treated as unprintable characters.  For a small git_buf,
the three BOM characters overwhelm the printable characters.  This
is problematic when trying to check out a small file as the CR/LF
filtering will not apply.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/buf_text.c b/src/buf_text.c
index 472339def..ecf592b51 100644
--- a/src/buf_text.c
+++ b/src/buf_text.c
@@ -170,8 +170,14 @@ int git_buf_text_common_prefix(git_buf *buf, const git_strarray *strings)
 bool git_buf_text_is_binary(const git_buf *buf)
 {
 	const char *scan = buf->ptr, *end = buf->ptr + buf->size;
+	git_bom_t bom;
 	int printable = 0, nonprintable = 0;
 
+	scan += git_buf_text_detect_bom(&bom, buf, 0);
+
+	if (bom > GIT_BOM_UTF8)
+		return 1;
+
 	while (scan < end) {
 		unsigned char c = *scan++;