void writeTo(final OutputStream os) throws IOException {
final MessageDigest foot = Constants.newMessageDigest();
final DigestOutputStream dos = new DigestOutputStream(os, foot);
boolean extended = false;
for (int i = 0; i < entryCnt; i++) extended |= sortedEntries[i].isExtended();
// Write the header.
//
final byte[] tmp = new byte[128];
System.arraycopy(SIG_DIRC, 0, tmp, 0, SIG_DIRC.length);
NB.encodeInt32(tmp, 4, extended ? 3 : 2);
NB.encodeInt32(tmp, 8, entryCnt);
dos.write(tmp, 0, 12);
// Write the individual file entries.
final int smudge_s;
final int smudge_ns;
if (myLock != null) {
// For new files we need to smudge the index entry
// if they have been modified "now". Ideally we'd
// want the timestamp when we're done writing the index,
// so we use the current timestamp as a approximation.
myLock.createCommitSnapshot();
snapshot = myLock.getCommitSnapshot();
smudge_s = (int) (snapshot.lastModified() / 1000);
smudge_ns = ((int) (snapshot.lastModified() % 1000)) * 1000000;
} else {
// Used in unit tests only
smudge_ns = 0;
smudge_s = 0;
}
// Check if tree is non-null here since calling updateSmudgedEntries
// will automatically build it via creating a DirCacheIterator
final boolean writeTree = tree != null;
if (repository != null && entryCnt > 0) updateSmudgedEntries();
for (int i = 0; i < entryCnt; i++) {
final DirCacheEntry e = sortedEntries[i];
if (e.mightBeRacilyClean(smudge_s, smudge_ns)) e.smudgeRacilyClean();
e.write(dos);
}
if (writeTree) {
final TemporaryBuffer bb = new TemporaryBuffer.LocalFile();
tree.write(tmp, bb);
bb.close();
NB.encodeInt32(tmp, 0, EXT_TREE);
NB.encodeInt32(tmp, 4, (int) bb.length());
dos.write(tmp, 0, 8);
bb.writeTo(dos, null);
}
writeIndexChecksum = foot.digest();
os.write(writeIndexChecksum);
os.close();
}