package org.simantics.db.javacore; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.Serializable; import java.nio.file.Files; import java.nio.file.Path; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; import java.util.Arrays; import org.simantics.acorn.exception.InvalidHeadStateException; /** * @deprecated exists only for backwards compatibility */ @Deprecated public class HeadState implements Serializable { private static final long serialVersionUID = -4135031566499790077L; public int headChangeSetId = 0; public long transactionId = 1; public long reservedIds = 3; public ArrayList clusters = new ArrayList<>(); public ArrayList files = new ArrayList<>(); public ArrayList stream = new ArrayList<>(); public ArrayList cs = new ArrayList<>(); // public ArrayList ccs = new ArrayList(); public static HeadState load(Path directory) throws InvalidHeadStateException { Path f = directory.resolve("head.state"); try { byte[] bytes = Files.readAllBytes(f); MessageDigest sha1 = MessageDigest.getInstance("SHA-1"); int digestLength = sha1.getDigestLength(); sha1.update(bytes, digestLength, bytes.length - digestLength); byte[] newChecksum = sha1.digest(); if (!Arrays.equals(newChecksum, Arrays.copyOfRange(bytes, 0, digestLength))) { throw new InvalidHeadStateException( "Checksum " + Arrays.toString(newChecksum) + " does not match excpected " + Arrays.toString(Arrays.copyOfRange(bytes, 0, digestLength)) + " for " + f.toAbsolutePath()); } try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytes, digestLength, bytes.length - digestLength))) { HeadState state = (HeadState) ois.readObject(); return state; } } catch (IOException i) { return new HeadState(); } catch (ClassNotFoundException c) { // throw new Error("HeadState class not found", c); return new HeadState(); } catch (NoSuchAlgorithmException e) { throw new Error("SHA-1 Algorithm not found", e); } } public static void validateHeadStateIntegrity(Path headState) throws InvalidHeadStateException, IOException { try { byte[] bytes = Files.readAllBytes(headState); MessageDigest sha1 = MessageDigest.getInstance("SHA-1"); int digestLength = sha1.getDigestLength(); sha1.update(bytes, digestLength, bytes.length - digestLength); byte[] newChecksum = sha1.digest(); if (!Arrays.equals(newChecksum, Arrays.copyOfRange(bytes, 0, digestLength))) { throw new InvalidHeadStateException( "Checksum " + Arrays.toString(newChecksum) + " does not match excpected " + Arrays.toString(Arrays.copyOfRange(bytes, 0, digestLength)) + " for " + headState.toAbsolutePath()); } } catch (NoSuchAlgorithmException e) { throw new Error("SHA-1 digest not found, should not happen", e); } } }