1 files changed, 57 insertions, 0 deletions
diff --git a/lowpan_hdlc_adapter/hdlc_lite.h b/lowpan_hdlc_adapter/hdlc_lite.h
new file mode 100644
index 0000000..4d4d554
--- /dev/null
+++ b/lowpan_hdlc_adapter/hdlc_lite.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef HEADER_HDLC_LITE_H_INCLUDED
+#define HEADER_HDLC_LITE_H_INCLUDED 1
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+static const uint8_t kHdlcResetSignal[] = { 0x7E, 0x13, 0x11, 0x7E };
+static const uint16_t kHdlcCrcCheckValue = 0xf0b8;
+static const uint16_t kHdlcCrcResetValue = 0xffff;
+
+#define HDLC_BYTE_FLAG             0x7E
+#define HDLC_BYTE_ESC              0x7D
+#define HDLC_BYTE_XON              0x11
+#define HDLC_BYTE_XOFF             0x13
+#define HDLC_BYTE_SPECIAL          0xF8
+#define HDLC_ESCAPE_XFORM          0x20
+
+/** HDLC CRC function */
+extern uint16_t hdlc_crc16(uint16_t fcs, uint8_t byte);
+
+/** HDLC CRC Finalize function */
+extern uint16_t hdlc_crc16_finalize(uint16_t fcs);
+
+/** Returns true if the byte needs to be escaped, false otherwise */
+extern bool hdlc_byte_needs_escape(uint8_t byte);
+
+/**
+ * Writes one or two HDLC-encoded bytes to out_buffer,
+ * and returns how many bytes were written.
+ */
+extern int hdlc_write_byte(uint8_t* out_buffer, uint8_t byte);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif // HEADER_HDLC_LITE_H_INCLUDED