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Different components of the AGL layers are under different licenses (a mix
of MIT and GPLv2). See LICENSE.GPL-2.0-only and LICENSE.MIT for further
details of the individual licenses.

All metadata (e.g. .bb, .bbappend, .bbclass, .inc, templates/* and similar)
is MIT licensed unless otherwise stated.
Source code included in tree for individual recipes (e.g. patches) are under
the LICENSE stated in the associated recipe (.bb file) unless otherwise stated.

License information for any other files (scripts) is either explicitly stated
or defaults to GPL version 2 only.

Individual files can contain the following style tags instead of the full
license text to identify their license:

    SPDX-License-Identifier: GPL-2.0-only
    SPDX-License-Identifier: MIT

This enables machine processing of license information based on the SPDX
License Identifiers that are here available: http://spdx.org/licenses/
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#!/usr/bin/env python
#
# Copyright (c) 2012, Intel Corporation.
# All rights reserved.
#
# 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.
#
#
# The CRC is a python translation of c code generated by (available under MIT license)
# pycrc 0.7.1 (http://www.tty1.net/pycrc/). Command line used:
# './pycrc.py --model=crc-32c --generate c --algorithm=table-driven'
#

import argparse
import os
import struct
import errno

__version__ = "0.0.1a"

#========================================================================
# IAS image creation
#========================================================================

MAGIC  = 0x2E6B7069
HEADER = struct.Struct('IIIIIII')

def image (payload, ext_hdr=''):

    payload_len = round_up(len(payload))
    image_len   = HEADER.size + len(ext_hdr) + payload_len + 4
    bytes       = bytearray (image_len)

    type = 0x30000
    version = 0
    length  = payload_len
    offset  = HEADER.size + len(ext_hdr)
    uncomp  = length	## compression not supported (yet)
    hcrc    = 0
    HEADER.pack_into (bytes, 0,
                      MAGIC, type, version, length, offset, uncomp, hcrc)
    crc = crc32c_buf (bytes[0:24])
    struct.pack_into ('I', bytes, 24, crc)

    bytes[HEADER.size:offset] = ext_hdr
    bytes[offset:offset+len(payload)] = payload
    crc = crc32c_buf(bytes[HEADER.size:offset+length])
    struct.pack_into ('I', bytes, offset+length, crc)

    return bytes

def multi_image (files):

    nfile = len(files)

    subimg = []
    o = 0
    for f in files:
        l = len(f)
        subimg.append((o, l))
        o += round_up(l)

    sizes   = bytearray(4*nfile)
    payload = bytearray(o)
    for i in range(nfile):
        o, l = subimg[i]
        struct.pack_into ('I', sizes, 4*i, l)
        payload[o:o+l] = files[i]

    return image (payload, sizes)

# ========================================================================
# Support functions.
# ========================================================================

def round_up (value, div=4):
    """Round VALUE up to the next multiple of DIV (a power of two)."""
    return (value + div - 1) & ~(div - 1)

# ========================================================================
#
#  CRC32C 
#
# Prehashed table of value to speed script execution
#
_CRC32C_TABLE = (

    0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4, 0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
    0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B, 0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
    0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B, 0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
    0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54, 0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
    0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A, 0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
    0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5, 0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
    0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45, 0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
    0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A, 0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
    0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48, 0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
    0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687, 0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
    0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927, 0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
    0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8, 0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
    0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096, 0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
    0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859, 0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
    0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9, 0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
    0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36, 0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
    0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C, 0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
    0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043, 0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
    0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3, 0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
    0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C, 0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
    0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652, 0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
    0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D, 0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
    0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D, 0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
    0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2, 0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
    0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530, 0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
    0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF, 0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
    0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F, 0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
    0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90, 0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
    0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE, 0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
    0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321, 0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
    0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81, 0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
    0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E, 0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351
)

def crc32c (byte, crc=0xffffffff):

    crc = (crc >> 8) ^ _CRC32C_TABLE[(crc ^ byte) & 0xff]
    return crc

def crc32c_buf (buf, crc=0xffffffff):

    for b in buf:
        crc = crc32c (b, crc)
    return crc

# ========================================================================

#========================================================================
# Main program: Argument handling.
#========================================================================

def parse_args():
    """Parse the command line and return an argparse.Namespace object."""

    parser = argparse.ArgumentParser(description='Create a NON SIGNED IAS image to be used with DEVEL-ABL.')

    parser.add_argument ('-V', '--version',
                         action='version', version='%(prog)s ' + __version__)
    parser.add_argument ('-o', '--output',
                         default='image.bin',
                         help='write final image to OUTPUT')
    parser.add_argument ('-i', '--ignore',
                         default='',
                         help='provided for script compatibility with full featured ias_image_app',)

    parser.add_argument ('file',
                         help='add FILE to payload of IMAGE being created',
                         nargs='+',
                         metavar='file')

    return parser.parse_args()

# ------------------------------------------------------------------------

def main():

    a = parse_args()
    try:
        data = [open(f, 'rb').read() for f in a.file]
    except IOError:
        print ('error: Cannot open', a.file)
        exit (1) 
    print ('Creating NON signed Linux Kernel for ABL')
    img = multi_image(data)
    try:
        open (a.output, 'wb').write (img)
    except IOError as err:
        print ('error: Cannot open for write', a.output)
        exit (2)     

if __name__ == '__main__':
    main()

# ========================================================================