dsc_extractor工具安装及使用 （dyld_share

此贴步骤通过狗神原贴整理，问题为自己总结
1、leo-MacBook-Pro:~ leo$ cd ~

2、leo-MacBook-Pro:~ leo$ mkdir dsc_extractor

3、leo-MacBook-Pro:~ leo$ cd dsc_extractor

4、leo-MacBook-Pro:~ leo$ wget http://opensource.apple.com/tarballs/dyld/dyld-210.2.3.tar.gz （提示无wget 个通过brew安装 brew install wget）

5、leo-MacBook-Pro:dsc_extractor leo$ tar xvf dyld-210.2.3.tar.gz

6、leo-MacBook-Pro:~ leo$ cd dyld-210.2.3/launch-cache/

7、leo-MacBook-Pro:launch-cache leo$ touch dsc_extractor.patch (ls 看下多出一个 dsc_extractor.patch 文件)

8、拷贝如下内容到dsc_extractor.patch文件中

https://gist.githubusercontent.com/lightbulbone/6092321/raw/305c9cc67a2379cdf852903de2d4b102c8e7bf4a/dsc_extractor.patch

9、leo-MacBook-Pro:launch-cache leo$ patch < dsc_extractor.patch (如遇问题可参考问题一)

10、leo-MacBook-Pro:launch-cache leo$ clang++ -o dsc_extractor dsc_extractor.cpp dsc_iterator.cpp （如遇问题可参考问题二）

xtractor.cpp dsc_iterator.cpp
In file included from dsc_extractor.cpp:51:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/ext/hash_map:213:5: warning:
  Use of the header <ext/hash_map> is deprecated. Migrate to
  <unordered_map> [-W#warnings]
#   warning Use of the header <ext/hash_map> is deprecat...
    ^
1 warning generated.

安装成功
11、使用

leo-MacBook-Pro:launch-cache leo$ ./dsc_extractor  /Users/leo/Desktop/iosRETest/dyld_shared_cache_arm64  /Users/leo/Desktop/iosRETest/dyldarm64

launch-cache目录下，./dsc_extractor dyld_shared_cache存放目录 /xxx/xx/x/解出的文件存放目录

问题一：

leo-MacBook-Pro:launch-cache leo$ patch < dsc_extractor.patch

patching file dsc_extractor.cpp
patch unexpectedly ends in middle of line
patch: **** unexpected end of file in patch

原处：

-#if 0 
+/* #if 0 */

修改成

-#if 1 
+/* #if 1 */

在+/* #endif */ 后 按下回车，添加一行

再次运行

patch < dsc_extractor.patch

问题二：

leo-MacBook-Pro:launch-cache leo$ clang++ -o dsc_extractor dsc_extractor.cpp dsc_iterator.cpp
In file included from dsc_extractor.cpp:51:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/ext/hash_map:213:5: warning:
  Use of the header <ext/hash_map> is deprecated. Migrate to
  <unordered_map> [-W#warnings]
#   warning Use of the header <ext/hash_map> is deprecat...
^
dsc_extractor.cpp:232:20: error: assigning to 'char *' from
  incompatible type 'const char *'
...while ( (slash = strchr(afterSlash, '/')) != NULL ) {
                  ^~~~~~~~~~~~~~~~~~~~~~~
dsc_extractor.cpp:460:2: error: unterminated conditional
  directive
#if 0
^
1 warning and 2 errors generated.

原处：230行

const char* afterSlash = &dirs[1];

修改成：

char* afterSlash = &dirs[1];  去除const

原处：460行

#if 0

修改成：

#if 1

原处：488行

/* #endif */

修改成：

#endif 放开注释

再次运行
clang++ -o dsc_extractor dsc_extractor.cpp dsc_iterator.cpp

步骤参考：http://iosre.com/t/when-dyld-decache-fails-on-dyld-shared-cache-arm64-dsc-extractor-saves-our-days/1974