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 CREATOR = new Parcelable.Creator() { public ManifestDigest createFromParcel(Parcel source) { return new ManifestDigest(source); } public ManifestDigest[] newArray(int size) { return new ManifestDigest[size]; } }; }