improve conn_send_file

Signed-off-by: Jianhui Zhao <zhaojh329@gmail.com>

src/connection.c

@@ -62,13 +62,16 @@ static void conn_send(struct uh_connection *conn, const void *data, ssize_t len)
     ev_io_start(conni->srv->loop, &conni->iow);
 }
 
-static void conn_send_file(struct uh_connection *conn, const char *path, size_t offset, size_t len)
+static void conn_send_file(struct uh_connection *conn, const char *path, size_t offset, ssize_t len)
 {
     struct uh_connection_internal *conni = (struct uh_connection_internal *)conn;
     size_t min = 8192;
     struct stat st;
     int fd;
 
+    if (len == 0)
+        return;
+
     fd = open(path, O_RDONLY);
     if (fd < 0) {
         uh_log_err("open: %s\n", strerror(errno));
@@ -85,7 +88,7 @@ static void conn_send_file(struct uh_connection *conn, const char *path, size_t
     lseek(fd, offset, SEEK_SET);
     st.st_size -= offset;
 
-    if (len == 0 || len > st.st_size)
+    if (len < 0 || len > st.st_size)
         len = st.st_size;
 
     /* If the file is not greater than 8K, then append it to the HTTP head, send once */

src/uhttpd.h

@@ -56,7 +56,7 @@ struct uh_connection {
     */
     void (*done)(struct uh_connection *conn);
     void (*send)(struct uh_connection *conn, const void *data, ssize_t len);
-    void (*send_file)(struct uh_connection *conn, const char *path, size_t offset, size_t len);
+    void (*send_file)(struct uh_connection *conn, const char *path, size_t offset, ssize_t len);
     void (*printf)(struct uh_connection *conn, const char *format, ...);
     void (*vprintf)(struct uh_connection *conn, const char *format, va_list arg);
     void (*send_status_line)(struct uh_connection *conn, int code, const char *extra_headers);