Example usage for java.util.jar Attributes Attributes

Introduction

In this page you can find the example usage for java.util.jar Attributes Attributes.

Prototype

public Attributes(Attributes attr) 

Source Link

Document

Constructs a new Attributes object with the same attribute name-value mappings as in the specified Attributes.

Usage

From source file:com.jrummyapps.busybox.signing.ZipSigner.java

/** Add the SHA1 of every file to the manifest, creating it if necessary. */
private static Manifest addDigestsToManifest(final JarFile jar) throws IOException, GeneralSecurityException {
    final Manifest input = jar.getManifest();
    final Manifest output = new Manifest();

    final Attributes main = output.getMainAttributes();
    main.putValue("Manifest-Version", MANIFEST_VERSION);
    main.putValue("Created-By", CREATED_BY);

    // We sort the input entries by name, and add them to the output manifest in sorted order.
    // We expect that the output map will be deterministic.
    final TreeMap<String, JarEntry> byName = new TreeMap<>();
    for (Enumeration<JarEntry> e = jar.entries(); e.hasMoreElements();) {
        JarEntry entry = e.nextElement();
        byName.put(entry.getName(), entry);
    }/*from  w  ww  .  j ava  2  s .c o  m*/

    final MessageDigest md = MessageDigest.getInstance("SHA1");
    final byte[] buffer = new byte[4096];
    int num;

    for (JarEntry entry : byName.values()) {
        final String name = entry.getName();
        if (!entry.isDirectory() && !name.equals(JarFile.MANIFEST_NAME) && !name.equals(CERT_SF_NAME)
                && !name.equals(CERT_RSA_NAME)) {
            InputStream data = jar.getInputStream(entry);
            while ((num = data.read(buffer)) > 0) {
                md.update(buffer, 0, num);
            }

            Attributes attr = null;
            if (input != null) {
                attr = input.getAttributes(name);
            }
            attr = attr != null ? new Attributes(attr) : new Attributes();
            attr.putValue("SHA1-Digest", base64encode(md.digest()));
            output.getEntries().put(name, attr);
        }
    }

    return output;
}

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