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diff --git a/circuitpython/py/binary.h b/circuitpython/py/binary.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2014 Paul Sokolovsky
+ * SPDX-FileCopyrightText: Copyright (c) 2014-2017 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_PY_BINARY_H
+#define MICROPY_INCLUDED_PY_BINARY_H
+
+#include "py/obj.h"
+
+// Use special typecode to differentiate repr() of bytearray vs array.array('B')
+// (underlyingly they're same).  Can't use 0 here because that's used to detect
+// type-specification errors due to end-of-string.
+#define BYTEARRAY_TYPECODE 1
+
+size_t mp_binary_get_size(char struct_type, char val_type, size_t *palign);
+mp_obj_t mp_binary_get_val_array(char typecode, void *p, size_t index);
+void mp_binary_set_val_array(char typecode, void *p, size_t index, mp_obj_t val_in);
+void mp_binary_set_val_array_from_int(char typecode, void *p, size_t index, mp_int_t val);
+mp_obj_t mp_binary_get_val(char struct_type, char val_type, byte *p_base, byte **ptr);
+void mp_binary_set_val(char struct_type, char val_type, mp_obj_t val_in, byte *p_base, byte **ptr);
+long long mp_binary_get_int(size_t size, bool is_signed, bool big_endian, const byte *src);
+void mp_binary_set_int(size_t val_sz, bool big_endian, byte *dest, mp_uint_t val);
+
+#endif // MICROPY_INCLUDED_PY_BINARY_H