| /* |
| * Copyright (C) 2008 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.content.ComponentName; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| |
| import java.util.Arrays; |
| |
| /** |
| * Opaque, immutable representation of a signature associated with an |
| * application package. |
| */ |
| public class Signature implements Parcelable { |
| private final byte[] mSignature; |
| private int mHashCode; |
| private boolean mHaveHashCode; |
| private String mString; |
| |
| /** |
| * Create Signature from an existing raw byte array. |
| */ |
| public Signature(byte[] signature) { |
| mSignature = signature.clone(); |
| } |
| |
| /** |
| * Create Signature from a text representation previously returned by |
| * {@link #toChars} or {@link #toCharsString()}. |
| */ |
| public Signature(String text) { |
| final int N = text.length()/2; |
| byte[] sig = new byte[N]; |
| for (int i=0; i<N; i++) { |
| char c = text.charAt(i*2); |
| byte b = (byte)( |
| (c >= 'a' ? (c - 'a' + 10) : (c - '0'))<<4); |
| c = text.charAt(i*2 + 1); |
| b |= (byte)(c >= 'a' ? (c - 'a' + 10) : (c - '0')); |
| sig[i] = b; |
| } |
| mSignature = sig; |
| } |
| |
| /** |
| * Encode the Signature as ASCII text. |
| */ |
| public char[] toChars() { |
| return toChars(null, null); |
| } |
| |
| /** |
| * Encode the Signature as ASCII text in to an existing array. |
| * |
| * @param existingArray Existing char array or null. |
| * @param outLen Output parameter for the number of characters written in |
| * to the array. |
| * @return Returns either <var>existingArray</var> if it was large enough |
| * to hold the ASCII representation, or a newly created char[] array if |
| * needed. |
| */ |
| public char[] toChars(char[] existingArray, int[] outLen) { |
| byte[] sig = mSignature; |
| final int N = sig.length; |
| final int N2 = N*2; |
| char[] text = existingArray == null || N2 > existingArray.length |
| ? new char[N2] : existingArray; |
| for (int j=0; j<N; j++) { |
| byte v = sig[j]; |
| int d = (v>>4)&0xf; |
| text[j*2] = (char)(d >= 10 ? ('a' + d - 10) : ('0' + d)); |
| d = v&0xf; |
| text[j*2+1] = (char)(d >= 10 ? ('a' + d - 10) : ('0' + d)); |
| } |
| if (outLen != null) outLen[0] = N; |
| return text; |
| } |
| |
| /** |
| * Return the result of {@link #toChars()} as a String. This result is |
| * cached so future calls will return the same String. |
| */ |
| public String toCharsString() { |
| if (mString != null) return mString; |
| String str = new String(toChars()); |
| mString = str; |
| return mString; |
| } |
| |
| /** |
| * @return the contents of this signature as a byte array. |
| */ |
| public byte[] toByteArray() { |
| byte[] bytes = new byte[mSignature.length]; |
| System.arraycopy(mSignature, 0, bytes, 0, mSignature.length); |
| return bytes; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| try { |
| if (obj != null) { |
| Signature other = (Signature)obj; |
| return Arrays.equals(mSignature, other.mSignature); |
| } |
| } catch (ClassCastException e) { |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| if (mHaveHashCode) { |
| return mHashCode; |
| } |
| mHashCode = Arrays.hashCode(mSignature); |
| mHaveHashCode = true; |
| return mHashCode; |
| } |
| |
| public int describeContents() { |
| return 0; |
| } |
| |
| public void writeToParcel(Parcel dest, int parcelableFlags) { |
| dest.writeByteArray(mSignature); |
| } |
| |
| public static final Parcelable.Creator<Signature> CREATOR |
| = new Parcelable.Creator<Signature>() { |
| public Signature createFromParcel(Parcel source) { |
| return new Signature(source); |
| } |
| |
| public Signature[] newArray(int size) { |
| return new Signature[size]; |
| } |
| }; |
| |
| private Signature(Parcel source) { |
| mSignature = source.createByteArray(); |
| } |
| } |