int buffer_ferror(struct line_buffer *buf);
char *buffer_read_line(struct line_buffer *buf);
int buffer_read_char(struct line_buffer *buf);
-void buffer_read_binary(struct line_buffer *buf, struct strbuf *sb, uint32_t len);
+size_t buffer_read_binary(struct line_buffer *buf, struct strbuf *sb, size_t len);
/* Returns number of bytes read (not necessarily written). */
off_t buffer_copy_bytes(struct line_buffer *buf, off_t len);
off_t buffer_skip_bytes(struct line_buffer *buf, off_t len);