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annotate examples/inject_redir.py @ 119:4f508f84c8a1

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Add inject_redir.py example
author Thinker K.F. Li <thinker@codemud.net>
date Fri, 05 Aug 2011 14:39:32 +0800
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children ff6f869273b7
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119
4f508f84c8a1 Add inject_redir.py example
Thinker K.F. Li <thinker@codemud.net>
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1 ## \file
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2 #
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3 # This is an example of inject a class from source to destinate DEX, and
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4 # rewrite all references of a specified class with the injected one and its
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5 # methods. All calls of specified class will be redirected to the
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6 # injected class.
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7 #
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8 from paraspace.dexfile import DEXFile, DEXFile_linked
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9 from paraspace.dex_deptracker import prepare_dep_decls
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10 from paraspace.dex_deptracker import restore_dependencies
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11 from paraspace.injection import inject_classdefs, make_methodidxs_redir_map
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12 from paraspace.injection import dexfile_redirect_types
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13 import sys
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14
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15 if len(sys.argv) != 6:
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16 print >> sys.stderr, \
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17 'usage: %s <src dex> <inject class> ' \
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18 '<dst dex> <redirect class> <output>' % \
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19 (sys.argv[0])
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20 sys.exit(1)
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21 pass
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22
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23 src_dexname = sys.argv[1]
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24 inj_classname = sys.argv[2]
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25 dst_dexname = sys.argv[3]
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26 redir_classname = sys.argv[4]
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27 output_name = sys.argv[5]
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28
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29 decls = prepare_dep_decls()
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30
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31 src_dex = DEXFile.open(src_dexname)
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32 src_linked = DEXFile_linked.build_dependencies(src_dex, decls)
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33
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34 dst_dex = DEXFile.open(dst_dexname)
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35 dst_linked = DEXFile_linked.build_dependencies(dst_dex, decls)
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36
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37 inj_classdef = src_linked.find_class_name(inj_classname)
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38 injected_classdefs = inject_classdefs(dst_linked, src_linked, [inj_classdef])
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39
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40 redir_typeid = dst_linked.find_typeid_name(redir_classname)
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41 redir_typeidx = dst_linked.get_idx_typeid(redir_typeid)
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42 inj_typeid = dst_linked.find_typeid_name(inj_classname)
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43 inj_typeidx = dst_linked.get_idx_typeid(inj_typeid)
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44 typeidxs_redir = {redir_typeidx: inj_typeidx}
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45
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46 methodidxs_redir = \
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47 make_methodidxs_redir_map(dst_linked, dst_linked, typeidxs_redir)
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48
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49 injected_typeidxs = [dst_linked.get_idx_classdef(classdef)
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50 for classdef in injected_classdefs]
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51 dexfile_redirect_types(dst_linked, typeidxs_redir, methodidxs_redir,
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52 excludes=injected_typeidxs)
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53
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54 restore_dependencies(dst_linked, decls)
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55 dst_linked.make_checksum()
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56
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57 restore_raw = dst_linked.to_str()
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58
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59 ofile = open(output_name, 'w')
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60 ofile.write(restore_raw)
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61 ofile.close()