1 #!/usr/bin/env python 2 # Copyright 2017, The Android Open Source Project 3 # 4 # Licensed under the Apache License, Version 2.0 (the "License"); 5 # you may not use this file except in compliance with the License. 6 # You may obtain a copy of the License at 7 # 8 # http://www.apache.org/licenses/LICENSE-2.0 9 # 10 # Unless required by applicable law or agreed to in writing, software 11 # distributed under the License is distributed on an "AS IS" BASIS, 12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 # See the License for the specific language governing permissions and 14 # limitations under the License. 15 from __future__ import print_function 16 try: 17 from os import fstat, stat, remove 18 from sys import exit 19 from argparse import ArgumentParser, FileType 20 from ctypes import sizeof, Structure, c_char, c_int 21 from struct import pack, calcsize 22 import zlib 23 except Exception as e: 24 print("some module is needed:" + str(e)) 25 exit(-1) 26 27 dt_head_info_fmt = '4sII' 28 dt_entry_fmt = 'Q4I2Q' 29 dtimg_version = 1 30 dtb_count = 1 31 32 def write32(output, value): 33 output.write(chr(value & 255)) ; value=value // 256 34 output.write(chr(value & 255)) ; value=value // 256 35 output.write(chr(value & 255)) ; value=value // 256 36 output.write(chr(value & 255)) 37 38 def compress(filename, input, output): 39 output.write('\037\213\010') 40 output.write(chr(0)) 41 42 statval = stat(filename) 43 write32(output, 0) 44 output.write('\002') 45 output.write('\003') 46 47 crcval = zlib.crc32("") 48 compobj = zlib.compressobj(9, zlib.DEFLATED, -zlib.MAX_WBITS, 49 zlib.DEF_MEM_LEVEL, 0) 50 while True: 51 data = input.read(1024) 52 if data == "": 53 break 54 crcval = zlib.crc32(data, crcval) 55 output.write(compobj.compress(data)) 56 output.write(compobj.flush()) 57 write32(output, crcval) 58 write32(output, statval.st_size) 59 60 def dtb_compress(dtb_file): 61 try: 62 outputname = dtb_file + '.gz' 63 input = open(dtb_file, 'rb') 64 output = open(outputname, 'wb') 65 compress(dtb_file, input, output) 66 input.close() 67 output.close() 68 except Exception as e: 69 print('dtb_compress error:' + str(e)) 70 exit(-1) 71 return outputname 72 73 class dt_head_info(Structure): 74 _fields_ = [('magic', c_char * 4), 75 ('version', c_int), 76 ('dt_count', c_int)] 77 78 class dt_entry_t(Structure): 79 _fields_ = [('dtb_size', c_int), 80 ('dtb_offset', c_int)] 81 82 def align_page_size(offset, pagesize): 83 return (pagesize - (offset % pagesize)) 84 85 def write_head_info(head_info, args): 86 args.output.write(pack(dt_head_info_fmt, 87 head_info.magic, 88 head_info.version, 89 head_info.dt_count)) 90 91 def write_dtb_entry_t(dt_entry, args): 92 args.output.write(pack(dt_entry_fmt, 93 0, # reserved 94 dt_entry.dtb_size, 95 0, # reserved 96 dt_entry.dtb_offset, 97 0, # reserved 98 0, # reserved 99 0)) # reserved 100 101 def write_padding(args, padding): 102 for i in range(0, padding): 103 args.output.write('\x00') 104 105 def write_dtb(args): 106 dtb_file = args.dtb 107 out_dtb = dtb_file 108 if args.compress == True: 109 out_dtb = dtb_compress(dtb_file) 110 try: 111 dtb_offset = calcsize(dt_head_info_fmt) + \ 112 calcsize(dt_entry_fmt) + \ 113 4 114 padding = align_page_size(dtb_offset, args.pagesize) 115 dtb_size = stat(out_dtb).st_size 116 dtb_size_padding = align_page_size(dtb_size, args.pagesize) 117 dt_entry = dt_entry_t(dtb_size + dtb_size_padding, 118 dtb_offset + padding) 119 write_dtb_entry_t(dt_entry, args) 120 args.output.write(pack('I', 0)) # SUCCESS code number 121 write_padding(args, padding) 122 with open(out_dtb, 'rb') as dtb_fd: 123 args.output.write(dtb_fd.read(dtb_size)) 124 write_padding(args, dtb_size_padding) 125 except Exception as e: 126 print('write dtb error:' + str(e)) 127 exit(-1) 128 129 def clean_gz_file(args): 130 try: 131 if args.compress != True: 132 return 133 remove(args.dtb + '.gz') 134 except Exception as e: 135 print('clean gz file error:' + str(e)) 136 exit(-1) 137 138 def parse_cmdline(): 139 parser = ArgumentParser() 140 parser.add_argument('-c', '--compress', help='compress dtb or not', 141 action='store_true') 142 parser.add_argument('-d', '--dtb', help='path to the dtb', type=str, 143 required=True) 144 parser.add_argument('-s', '--pagesize', help='align page size', 145 type=int, choices=[2**i for i in range(11,15)], 146 default=2048) 147 parser.add_argument('-o', '--output', help='output file name', 148 type=FileType('wb'), required=True) 149 return parser.parse_args() 150 151 def main(): 152 args = parse_cmdline() 153 dtimg_head_info = dt_head_info('HSDT', dtimg_version, dtb_count) 154 write_head_info(dtimg_head_info, args) 155 write_dtb(args) 156 clean_gz_file(args) 157 158 if __name__ == '__main__': 159 main() 160
