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