646 if (comment != null) { // zip file comment
647 writeShort(comment.length);
648 writeBytes(comment, 0, comment.length);
649 } else {
650 writeShort(0);
651 }
652 }
653
654 /*
655 * Returns the length of extra data without EXTT and ZIP64.
656 */
657 private int getExtraLen(byte[] extra) {
658 if (extra == null)
659 return 0;
660 int skipped = 0;
661 int len = extra.length;
662 int off = 0;
663 while (off + 4 <= len) {
664 int tag = get16(extra, off);
665 int sz = get16(extra, off + 2);
666 if (tag == EXTID_EXTT || tag == EXTID_ZIP64) {
667 skipped += (sz + 4);
668 }
669 off += (sz + 4);
670 }
671 return len - skipped;
672 }
673
674 /*
675 * Writes extra data without EXTT and ZIP64.
676 *
677 * Extra timestamp and ZIP64 data is handled/output separately
678 * in writeLOC and writeCEN.
679 */
680 private void writeExtra(byte[] extra) throws IOException {
681 if (extra != null) {
682 int len = extra.length;
683 int off = 0;
684 while (off + 4 <= len) {
685 int tag = get16(extra, off);
686 int sz = get16(extra, off + 2);
687 if (tag != EXTID_EXTT && tag != EXTID_ZIP64) {
688 writeBytes(extra, off, sz + 4);
689 }
690 off += (sz + 4);
691 }
692 }
693 }
694
695 /*
696 * Writes a 8-bit byte to the output stream.
697 */
698 private void writeByte(int v) throws IOException {
699 OutputStream out = this.out;
700 out.write(v & 0xff);
701 written += 1;
702 }
703
704 /*
705 * Writes a 16-bit short to the output stream in little-endian byte order.
706 */
707 private void writeShort(int v) throws IOException {
708 OutputStream out = this.out;
709 out.write((v >>> 0) & 0xff);
710 out.write((v >>> 8) & 0xff);
711 written += 2;
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646 if (comment != null) { // zip file comment
647 writeShort(comment.length);
648 writeBytes(comment, 0, comment.length);
649 } else {
650 writeShort(0);
651 }
652 }
653
654 /*
655 * Returns the length of extra data without EXTT and ZIP64.
656 */
657 private int getExtraLen(byte[] extra) {
658 if (extra == null)
659 return 0;
660 int skipped = 0;
661 int len = extra.length;
662 int off = 0;
663 while (off + 4 <= len) {
664 int tag = get16(extra, off);
665 int sz = get16(extra, off + 2);
666 if (sz < 0 || (off + 4 + sz) > len) {
667 break;
668 }
669 if (tag == EXTID_EXTT || tag == EXTID_ZIP64) {
670 skipped += (sz + 4);
671 }
672 off += (sz + 4);
673 }
674 return len - skipped;
675 }
676
677 /*
678 * Writes extra data without EXTT and ZIP64.
679 *
680 * Extra timestamp and ZIP64 data is handled/output separately
681 * in writeLOC and writeCEN.
682 */
683 private void writeExtra(byte[] extra) throws IOException {
684 if (extra != null) {
685 int len = extra.length;
686 int off = 0;
687 while (off + 4 <= len) {
688 int tag = get16(extra, off);
689 int sz = get16(extra, off + 2);
690 if (sz < 0 || (off + 4 + sz) > len) {
691 writeBytes(extra, off, len - off);
692 return;
693 }
694 if (tag != EXTID_EXTT && tag != EXTID_ZIP64) {
695 writeBytes(extra, off, sz + 4);
696 }
697 off += (sz + 4);
698 }
699 if (off < len) {
700 writeBytes(extra, off, len - off);
701 }
702 }
703 }
704
705 /*
706 * Writes a 8-bit byte to the output stream.
707 */
708 private void writeByte(int v) throws IOException {
709 OutputStream out = this.out;
710 out.write(v & 0xff);
711 written += 1;
712 }
713
714 /*
715 * Writes a 16-bit short to the output stream in little-endian byte order.
716 */
717 private void writeShort(int v) throws IOException {
718 OutputStream out = this.out;
719 out.write((v >>> 0) & 0xff);
720 out.write((v >>> 8) & 0xff);
721 written += 2;
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