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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.content.pm;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.Base64;
import java.util.Arrays;
import java.util.jar.Attributes;
/**
* Represents the manifest digest for a package. This is suitable for comparison
* of two packages to know whether the manifests are identical.
*
* @hide
*/
public class ManifestDigest implements Parcelable {
/** The digest of the manifest in our preferred order. */
private final byte[] mDigest;
/** Digest field names to look for in preferred order. */
private static final String[] DIGEST_TYPES = {
"SHA1-Digest", "SHA-Digest", "MD5-Digest",
};
/** What we print out first when toString() is called. */
private static final String TO_STRING_PREFIX = "ManifestDigest {mDigest=";
ManifestDigest(byte[] digest) {
mDigest = digest;
}
private ManifestDigest(Parcel source) {
mDigest = source.createByteArray();
}
static ManifestDigest fromAttributes(Attributes attributes) {
if (attributes == null) {
return null;
}
String encodedDigest = null;
for (int i = 0; i < DIGEST_TYPES.length; i++) {
final String value = attributes.getValue(DIGEST_TYPES[i]);
if (value != null) {
encodedDigest = value;
break;
}
}
if (encodedDigest == null) {
return null;
}
final byte[] digest = Base64.decode(encodedDigest, Base64.DEFAULT);
return new ManifestDigest(digest);
}
@Override
public int describeContents() {
return 0;
}
@Override
public boolean equals(Object o) {
if (!(o instanceof ManifestDigest)) {
return false;
}
final ManifestDigest other = (ManifestDigest) o;
return this == other || Arrays.equals(mDigest, other.mDigest);
}
@Override
public int hashCode() {
return Arrays.hashCode(mDigest);
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder(TO_STRING_PREFIX.length()
+ (mDigest.length * 3) + 1);
sb.append(TO_STRING_PREFIX);
final int N = mDigest.length;
for (int i = 0; i < N; i++) {
final byte b = mDigest[i];
IntegralToString.appendByteAsHex(sb, b, false);
sb.append(',');
}
sb.append('}');
return sb.toString();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeByteArray(mDigest);
}
public static final Parcelable.Creator<ManifestDigest> CREATOR
= new Parcelable.Creator<ManifestDigest>() {
public ManifestDigest createFromParcel(Parcel source) {
return new ManifestDigest(source);
}
public ManifestDigest[] newArray(int size) {
return new ManifestDigest[size];
}
};
}
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