#!/bin/bash

# Copyright 2023 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# This script generates Rust bindings for the usb_bulk C++ library.

# Determine paths for this script and its directory, and set $FUCHSIA_DIR.
readonly FULL_PATH="${BASH_SOURCE[0]}"
readonly SCRIPT_DIR="$(cd "$(dirname "${FULL_PATH}")" >/dev/null 2>&1 && pwd)"
source "${SCRIPT_DIR}/../../../tools/devshell/lib/vars.sh"

set -eu

cd "${SCRIPT_DIR}"

readonly RELPATH="${FULL_PATH#${FUCHSIA_DIR}/}"
readonly BINDGEN="${PREBUILT_RUST_BINDGEN_DIR}/bindgen"

ZEROCOPY_SYMS_REGEX="usb_descriptor_header|usb_(device|endpoint|interface)_descriptor"

# Generate annotations for the top of the generated source file.
readonly RAW_LINES="// Copyright 2023 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Generated by ${RELPATH} using $("${BINDGEN}" --version)

#![allow(dead_code)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
#![allow(non_upper_case_globals)]

use zerocopy::{FromBytes, AsBytes, Unaligned};"

"${BINDGEN}" \
    ${SCRIPT_DIR}/usbdevfs_stub.h \
    --disable-header-comment \
    --raw-line "${RAW_LINES}" \
    --with-derive-default \
    --with-derive-custom-struct ${ZEROCOPY_SYMS_REGEX}=FromBytes \
    --with-derive-custom-struct ${ZEROCOPY_SYMS_REGEX}=AsBytes \
    --with-derive-custom-struct ${ZEROCOPY_SYMS_REGEX}=Unaligned \
    --impl-debug \
    --output src/usb_linux/usbdevice_fs.rs \
    -- -I${FUCHSIA_DIR}/prebuilt/third_party/sysroot/linux/usr/include \