1#!/bin/bash 2# 3# Copyright 2019 The Android Open Source Project 4# 5# Licensed under the Apache License, Version 2.0 (the "License"); 6# you may not use this file except in compliance with the License. 7# You may obtain a copy of the License at 8# 9# http://www.apache.org/licenses/LICENSE-2.0 10# 11# Unless required by applicable law or agreed to in writing, software 12# distributed under the License is distributed on an "AS IS" BASIS, 13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14# See the License for the specific language governing permissions and 15# limitations under the License. 16 17# This script generates dex files which all contain an empty class called 18# MyClassXX, where XX is the ID of the dex file. It prints the first file 19# (ID=01) and a list of checksum/signature bytes for all of the dex files 20# (ID 01 through NUM_FILES). 21# The idea is that the associated test will be able to efficiently generate 22# up to NUM_FILES dex files from the first dex file by substituting its 23# checksum/signature bytes with that of the dex file of a given ID. Note that 24# it is also necessary to replace the ID in the class descriptor, but this 25# script does not help with that. 26 27set -e 28TMP=`mktemp -d` 29NUM_FILES=30 30 31echo ' private static final byte[][] DEX_CHECKSUMS = new byte[][] {' 32for i in $(seq 1 ${NUM_FILES}); do 33 if [ ${i} -lt 10 ]; then 34 suffix=0${i} 35 else 36 suffix=${i} 37 fi 38 (cd "$TMP" && \ 39 echo "public class MyClass${suffix} { }" > "$TMP/MyClass${suffix}.java" && \ 40 javac -d "${TMP}" "$TMP/MyClass${suffix}.java" && \ 41 d8 --output "$TMP" "$TMP/MyClass${suffix}.class" && \ 42 mv "$TMP/classes.dex" "$TMP/file${suffix}.dex") 43 44 # Dump bytes 8-32 (checksum + signature) that need to change for other files. 45 checksum=`head -c 32 -z "$TMP/file${suffix}.dex" | tail -c 24 -z | base64` 46 echo ' Base64.getDecoder().decode("'${checksum}'"),' 47done 48echo ' };' 49 50# Dump first dex file as base. 51echo ' private static final byte[] DEX_BYTES_01 = Base64.getDecoder().decode(' 52base64 "${TMP}/file01.dex" | sed -E 's/^/ "/' | sed ':a;N;$!ba;s/\n/" +\n/g' | sed -E '$ s/$/");/' 53 54rm -rf "$TMP" 55