Public bytenuts repository creation

src/xmodem.h

@@ -0,0 +1,48 @@
+#ifndef _XMODEM_H_
+#define _XMODEM_H_
+
+#include <stdio.h>
+
+#include "serial.h"
+
+#define XMODEM_SOH           (0x01)
+#define XMODEM_STX           (0x02)
+#define XMODEM_EOT           (0x04)
+#define XMODEM_ACK           (0x06)
+#define XMODEM_NAK           (0x15)
+#define XMODEM_ETB           (0x17)
+#define XMODEM_CAN           (0x18)
+#define XMODEM_CRC           (0x43) /* 'C' */
+#define XMODEM_PAD           (0x1A)
+
+#define XMODEM_TIMEOUT       (10000) /* in ms */
+
+#define XMODEM_ERR_TIMEOUT   (1) /* ACK timeout */
+#define XMODEM_ERR_WRITE     (2) /* Failed to write to file descriptor */
+#define XMODEM_ERR_FILEIO    (3) /* Error on reading from file descriptor */
+#define XMODEM_ERR_READ      (4) /* Failed to read from the serial connection */
+#define XMODEM_ERR_CANCEL    (5) /* Sender cancelled the transmission */
+#define XMODEM_ERR_DONE      (6) /* Sender finished the transmission */
+
+/*
+ * Following this setup: https://pythonhosted.org/xmodem/xmodem.html
+ * Choose to send `sz` bytes from `in_fd` to `dest_fd` via XModem with a payload
+ * length of `block_sz`.
+ */
+int xmodem_send(
+    int dest_fd,
+    int in_fd,
+    size_t sz,
+    int block_sz,
+    void (*status_cb)(size_t sent, size_t total)
+);
+
+#if 0
+/* Receive an xmodem message
+ *
+ * If sz is non-negative, then only that many bytes will actually be written
+ * to fd. But the entire xmodem transfer will be completed */
+int xmodem_recv(int in_fd, int dest_fd, ssize_t sz);
+#endif
+
+#endif /* _XMODEM_H_ */