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Revision22d3b10954ba6415e28c5fd8a08fb048c8d5cbfd (tree)
Zeit2016-09-04 08:47:14
AutorM1cha <sigmaepsilon92@gmai...>
CommiterSteve Kondik

Log Message

unpackbootimg: turn into a python script

Turn unpackbootimg into a python script instead of a C utility

Change-Id: If049319d12ee9841eefb9ca3fdae5c775403bbbf

Ändern Zusammenfassung

Diff

--- a/mkbootimg/Android.mk
+++ b/mkbootimg/Android.mk
@@ -10,7 +10,13 @@ LOCAL_MODULE := mkbootimg
1010
1111 include $(BUILD_PREBUILT)
1212
13+
1314 include $(CLEAR_VARS)
14-LOCAL_SRC_FILES := unpackbootimg.c
15+
16+LOCAL_SRC_FILES := unpackbootimg
17+LOCAL_MODULE_CLASS := EXECUTABLES
18+LOCAL_IS_HOST_MODULE := true
19+
1520 LOCAL_MODULE := unpackbootimg
16-include $(BUILD_HOST_EXECUTABLE)
21+
22+include $(BUILD_PREBUILT)
--- /dev/null
+++ b/mkbootimg/unpackbootimg
@@ -0,0 +1,167 @@
1+#!/usr/bin/env python
2+# Copyright 2015, 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+
16+from __future__ import print_function
17+from sys import exit
18+from argparse import ArgumentParser, FileType
19+from os import rename
20+from os.path import basename
21+from struct import unpack, calcsize
22+
23+class Bunch:
24+ def __init__(self, **kwds):
25+ self.__dict__.update(kwds)
26+
27+def auto_unpack(fmt, f):
28+ size = calcsize(fmt)
29+ data = f.read(size)
30+ return unpack(fmt, data[0:size])
31+
32+def get_magic_off(f):
33+ BOOT_MAGIC = 'ANDROID!'.encode()
34+
35+ for i in range(513):
36+ f.seek(i)
37+ tmp = f.read(len(BOOT_MAGIC))
38+ if tmp == BOOT_MAGIC:
39+ print('Android magic found at: %d' % i)
40+ return i
41+
42+ print('Android boot magic not found.');
43+ exit(1)
44+
45+def read_header(args, off):
46+ args.input.seek(off)
47+ fmt = '8s10I16s512s32s1024s'
48+ unpacked = auto_unpack(fmt, args.input)
49+
50+ parsed = Bunch()
51+ parsed.headersz = calcsize(fmt)
52+ parsed.magic = unpacked[0]
53+ parsed.kernel_size = unpacked[1]
54+ parsed.kernel_addr = unpacked[2]
55+ parsed.ramdisk_size = unpacked[3]
56+ parsed.ramdisk_addr = unpacked[4]
57+ parsed.second_size = unpacked[5]
58+ parsed.second_addr = unpacked[6]
59+ parsed.tags_addr = unpacked[7]
60+ parsed.pagesize = unpacked[8]
61+ parsed.dt_size = unpacked[9]
62+ parsed.name = unpacked[11].partition(b'\0')[0].decode()
63+ parsed.cmdline = unpacked[12].partition(b'\0')[0].decode()
64+ parsed.id = unpacked[13]
65+ parsed.cmdline += unpacked[14].partition(b'\0')[0].decode()
66+
67+ os_version = unpacked[10]>>11
68+ os_patch_level = unpacked[10]&0x7ff
69+
70+ a = (os_version>>14)&0x7f
71+ b = (os_version>>7)&0x7f
72+ c = os_version&0x7f
73+ parsed.os_version = '%d.%d.%d' % (a,b,c)
74+
75+ y = (os_patch_level>>4) + 2000
76+ m = os_patch_level&0xf
77+ parsed.os_patch_level = '%04d-%02d-%02d' % (y,m,0)
78+
79+ return parsed
80+
81+def write_str_to_file(filename, s):
82+ with open(filename, 'wb') as f:
83+ f.write(s.encode())
84+
85+def parse_int(x):
86+ return int(x, 0)
87+
88+def parse_cmdline():
89+ parser = ArgumentParser()
90+ parser.add_argument('-i', '--input', help='input file name', type=FileType('rb'),
91+ required=True)
92+ parser.add_argument('-o', '--output', help='output directory', default='')
93+ parser.add_argument('--pagesize', help='page size', type=parse_int,
94+ choices=[2**i for i in range(11,15)], default=0)
95+ return parser.parse_args()
96+
97+def seek_padding(f, size, pagesize):
98+ pagemask = pagesize - 1;
99+ if((size & pagemask) != 0):
100+ count = pagesize - (size & pagemask);
101+ f.seek(count, 1);
102+
103+def write_input_to_file(args, filename, size):
104+ with open(filename, 'wb') as f_out:
105+ f_out.write(args.input.read(size))
106+
107+ seek_padding(args.input, size, args.pagesize)
108+
109+def fix_ramdisk_extension(filename):
110+ bytes = []
111+ with open(filename, 'rb') as f:
112+ data = f.read(2)
113+ if(len(data))!=2:
114+ return
115+ bytes = unpack('BB', data)
116+
117+ if bytes[0]==0x02 and bytes[1]==0x21:
118+ rename(filename, filename+'.lz4')
119+ else:
120+ rename(filename, filename+'.gz')
121+
122+def write_data(args, header, off):
123+ file_prefix = args.output
124+ if file_prefix and file_prefix[-1]!='/':
125+ file_prefix += '/'
126+ file_prefix += basename(args.input.name) + '-'
127+
128+ write_str_to_file(file_prefix+'cmdline', header.cmdline)
129+ write_str_to_file(file_prefix+'base', '%08x' % (header.kernel_addr - 0x00008000))
130+ write_str_to_file(file_prefix+'ramdisk_offset', '%08x' % (header.ramdisk_addr - header.kernel_addr + 0x00008000))
131+ write_str_to_file(file_prefix+'second_offset', '%08x' % (header.second_addr - header.kernel_addr + 0x00008000))
132+ write_str_to_file(file_prefix+'tags_offset', '%08x' % (header.tags_addr - header.kernel_addr + 0x00008000))
133+ write_str_to_file(file_prefix+'pagesize', '%d' % header.pagesize)
134+ write_str_to_file(file_prefix+'name', header.name)
135+ write_str_to_file(file_prefix+'os_version', header.os_version)
136+ write_str_to_file(file_prefix+'os_patch_level', header.os_patch_level)
137+
138+ seek_padding(args.input, header.headersz, args.pagesize)
139+
140+ write_input_to_file(args, file_prefix+'zImage', header.kernel_size)
141+ write_input_to_file(args, file_prefix+'ramdisk', header.ramdisk_size)
142+ write_input_to_file(args, file_prefix+'second', header.second_size)
143+ write_input_to_file(args, file_prefix+'dt', header.dt_size)
144+
145+ fix_ramdisk_extension(file_prefix+'ramdisk')
146+
147+def main():
148+ args = parse_cmdline()
149+ off = get_magic_off(args.input)
150+ header = read_header(args, off)
151+
152+ print('BOARD_KERNEL_CMDLINE %s' % header.cmdline)
153+ print('BOARD_KERNEL_BASE %08x' % (header.kernel_addr - 0x00008000))
154+ print('BOARD_RAMDISK_OFFSET %08x' % (header.ramdisk_addr - header.kernel_addr + 0x00008000))
155+ print('BOARD_SECOND_OFFSET %08x' % (header.second_addr - header.kernel_addr + 0x00008000))
156+ print('BOARD_TAGS_OFFSET %08x' % (header.tags_addr - header.kernel_addr + 0x00008000))
157+ print('BOARD_PAGE_SIZE %d' % header.pagesize)
158+ print('BOARD_SECOND_SIZE %d' % header.second_size)
159+ print('BOARD_DT_SIZE %d' % header.dt_size)
160+
161+ if args.pagesize == 0:
162+ args.pagesize = header.pagesize
163+
164+ write_data(args, header, off)
165+
166+if __name__ == '__main__':
167+ main()
--- a/mkbootimg/unpackbootimg.c
+++ /dev/null
@@ -1,211 +0,0 @@
1-#include <stdio.h>
2-#include <stdlib.h>
3-#include <string.h>
4-#include <unistd.h>
5-#include <fcntl.h>
6-#include <errno.h>
7-#include <limits.h>
8-#include <libgen.h>
9-
10-#include "mincrypt/sha.h"
11-#include "bootimg.h"
12-
13-typedef unsigned char byte;
14-
15-int read_padding(FILE* f, unsigned itemsize, int pagesize)
16-{
17- byte* buf = (byte*)malloc(sizeof(byte) * pagesize);
18- unsigned pagemask = pagesize - 1;
19- unsigned count;
20-
21- if((itemsize & pagemask) == 0) {
22- free(buf);
23- return 0;
24- }
25-
26- count = pagesize - (itemsize & pagemask);
27-
28- fread(buf, count, 1, f);
29- free(buf);
30- return count;
31-}
32-
33-void write_string_to_file(char* file, char* string)
34-{
35- FILE* f = fopen(file, "w");
36- fwrite(string, strlen(string), 1, f);
37- fwrite("\n", 1, 1, f);
38- fclose(f);
39-}
40-
41-int usage() {
42- printf("usage: unpackbootimg\n");
43- printf("\t-i|--input boot.img\n");
44- printf("\t[ -o|--output output_directory]\n");
45- printf("\t[ -p|--pagesize <size-in-hexadecimal> ]\n");
46- return 0;
47-}
48-
49-int main(int argc, char** argv)
50-{
51- char tmp[PATH_MAX];
52- char* directory = "./";
53- char* filename = NULL;
54- int pagesize = 0;
55-
56- argc--;
57- argv++;
58- while(argc > 0){
59- char *arg = argv[0];
60- char *val = argv[1];
61- argc -= 2;
62- argv += 2;
63- if(!strcmp(arg, "--input") || !strcmp(arg, "-i")) {
64- filename = val;
65- } else if(!strcmp(arg, "--output") || !strcmp(arg, "-o")) {
66- directory = val;
67- } else if(!strcmp(arg, "--pagesize") || !strcmp(arg, "-p")) {
68- pagesize = strtoul(val, 0, 16);
69- } else {
70- return usage();
71- }
72- }
73-
74- if (filename == NULL) {
75- return usage();
76- }
77-
78- int total_read = 0;
79- FILE* f = fopen(filename, "rb");
80- boot_img_hdr header;
81-
82- //printf("Reading header...\n");
83- int i;
84- for (i = 0; i <= 512; i++) {
85- fseek(f, i, SEEK_SET);
86- fread(tmp, BOOT_MAGIC_SIZE, 1, f);
87- if (memcmp(tmp, BOOT_MAGIC, BOOT_MAGIC_SIZE) == 0)
88- break;
89- }
90- total_read = i;
91- if (i > 512) {
92- printf("Android boot magic not found.\n");
93- return 1;
94- }
95- fseek(f, i, SEEK_SET);
96- printf("Android magic found at: %d\n", i);
97-
98- fread(&header, sizeof(header), 1, f);
99- printf("BOARD_KERNEL_CMDLINE %s\n", header.cmdline);
100- printf("BOARD_KERNEL_BASE %08x\n", header.kernel_addr - 0x00008000);
101- printf("BOARD_RAMDISK_OFFSET %08x\n", header.ramdisk_addr - header.kernel_addr + 0x00008000);
102- printf("BOARD_SECOND_OFFSET %08x\n", header.second_addr - header.kernel_addr + 0x00008000);
103- printf("BOARD_TAGS_OFFSET %08x\n",header.tags_addr - header.kernel_addr + 0x00008000);
104- printf("BOARD_PAGE_SIZE %d\n", header.page_size);
105- printf("BOARD_SECOND_SIZE %d\n", header.second_size);
106- printf("BOARD_DT_SIZE %d\n", header.dt_size);
107-
108- if (pagesize == 0) {
109- pagesize = header.page_size;
110- }
111-
112- //printf("cmdline...\n");
113- sprintf(tmp, "%s/%s", directory, basename(filename));
114- strcat(tmp, "-cmdline");
115- write_string_to_file(tmp, header.cmdline);
116-
117- //printf("base...\n");
118- sprintf(tmp, "%s/%s", directory, basename(filename));
119- strcat(tmp, "-base");
120- char basetmp[200];
121- sprintf(basetmp, "%08x", header.kernel_addr - 0x00008000);
122- write_string_to_file(tmp, basetmp);
123-
124- //printf("ramdisk_offset...\n");
125- sprintf(tmp, "%s/%s", directory, basename(filename));
126- strcat(tmp, "-ramdisk_offset");
127- char ramdisktmp[200];
128- sprintf(ramdisktmp, "%08x", header.ramdisk_addr - header.kernel_addr + 0x00008000);
129- write_string_to_file(tmp, ramdisktmp);
130-
131- //printf("second_offset...\n");
132- sprintf(tmp, "%s/%s", directory, basename(filename));
133- strcat(tmp, "-second_offset");
134- char secondtmp[200];
135- sprintf(secondtmp, "%08x", header.second_addr - header.kernel_addr + 0x00008000);
136- write_string_to_file(tmp, secondtmp);
137-
138- //printf("tags_offset...\n");
139- sprintf(tmp, "%s/%s", directory, basename(filename));
140- strcat(tmp, "-tags_offset");
141- char tagstmp[200];
142- sprintf(tagstmp, "%08x", header.tags_addr - header.kernel_addr + 0x00008000);
143- write_string_to_file(tmp, tagstmp);
144-
145- //printf("pagesize...\n");
146- sprintf(tmp, "%s/%s", directory, basename(filename));
147- strcat(tmp, "-pagesize");
148- char pagesizetmp[200];
149- sprintf(pagesizetmp, "%d", header.page_size);
150- write_string_to_file(tmp, pagesizetmp);
151-
152- total_read += sizeof(header);
153- //printf("total read: %d\n", total_read);
154- total_read += read_padding(f, sizeof(header), pagesize);
155-
156- sprintf(tmp, "%s/%s", directory, basename(filename));
157- strcat(tmp, "-zImage");
158- FILE *k = fopen(tmp, "wb");
159- byte* kernel = (byte*)malloc(header.kernel_size);
160- //printf("Reading kernel...\n");
161- fread(kernel, header.kernel_size, 1, f);
162- total_read += header.kernel_size;
163- fwrite(kernel, header.kernel_size, 1, k);
164- fclose(k);
165-
166- //printf("total read: %d\n", header.kernel_size);
167- total_read += read_padding(f, header.kernel_size, pagesize);
168-
169-
170- byte* ramdisk = (byte*)malloc(header.ramdisk_size);
171- //printf("Reading ramdisk...\n");
172- fread(ramdisk, header.ramdisk_size, 1, f);
173- total_read += header.ramdisk_size;
174- sprintf(tmp, "%s/%s", directory, basename(filename));
175- if(ramdisk[0] == 0x02 && ramdisk[1]== 0x21)
176- strcat(tmp, "-ramdisk.lz4");
177- else
178- strcat(tmp, "-ramdisk.gz");
179- FILE *r = fopen(tmp, "wb");
180- fwrite(ramdisk, header.ramdisk_size, 1, r);
181- fclose(r);
182-
183- total_read += read_padding(f, header.ramdisk_size, pagesize);
184-
185- sprintf(tmp, "%s/%s", directory, basename(filename));
186- strcat(tmp, "-second");
187- FILE *s = fopen(tmp, "wb");
188- byte* second = (byte*)malloc(header.second_size);
189- //printf("Reading second...\n");
190- fread(second, header.second_size, 1, f);
191- total_read += header.second_size;
192- fwrite(second, header.second_size, 1, r);
193- fclose(s);
194-
195- total_read += read_padding(f, header.second_size, pagesize);
196-
197- sprintf(tmp, "%s/%s", directory, basename(filename));
198- strcat(tmp, "-dt");
199- FILE *d = fopen(tmp, "wb");
200- byte* dt = (byte*)malloc(header.dt_size);
201- //printf("Reading dt...\n");
202- fread(dt, header.dt_size, 1, f);
203- total_read += header.dt_size;
204- fwrite(dt, header.dt_size, 1, r);
205- fclose(d);
206-
207- fclose(f);
208-
209- //printf("Total Read: %d\n", total_read);
210- return 0;
211-}