/** "Parsing function for custody signal bundles." [DTN2] */
public static boolean parse_custody_signal(data_t data, IByteBuffer bp, int len) {
// "1 byte Admin Payload Type + Flags:" [DTN2]
byte type_and_flag_byte = bp.get();
if (len < 1) {
return false;
}
data.admin_type_ = admin_record_type_t.get((byte) (type_and_flag_byte >> 4));
data.admin_flags_ = (byte) (type_and_flag_byte & 0xf);
len--;
// "validate the admin type" [DTN2]
if (data.admin_type_ != BundleProtocol.admin_record_type_t.ADMIN_CUSTODY_SIGNAL) {
return false;
}
int status_flag_byte = bp.get();
// Success flag and reason code
if (len < 1) {
return false;
}
data.succeeded_ = (status_flag_byte & 0x80) > 0;
data.reason_ = BundleProtocol.custody_signal_reason_t.get((byte) (status_flag_byte & 0x7f));
len--;
// "Fragment SDNV Fields (offset & length), if present:" [DTN2]
if ((data.admin_flags_ & BundleProtocol.admin_record_flags_t.ADMIN_IS_FRAGMENT.getCode()) > 0) {
int[] value = new int[1];
int sdnv_bytes = SDNV.decode(bp, len, value);
if (sdnv_bytes == -1) {
return false;
}
len -= sdnv_bytes;
data.set_orig_frag_offset(value[0]);
sdnv_bytes = SDNV.decode(bp, len, value);
if (sdnv_bytes == -1) {
return false;
}
len -= sdnv_bytes;
data.set_orig_frag_length(value[0]);
}
int ts_len;
// The signal DTNTime
ts_len = DTNTime.SDNV_decoding_len(bp);
if (ts_len < 0) {
return false;
}
DTNTime.decodeSDNV(data.custody_signal_tv(), bp);
len -= ts_len;
// Bundle Creation Timestamp
ts_len = BundleTimestamp.SDNV_decoding_len(bp);
if (ts_len < 0) {
return false;
}
BundleTimestamp.decodeSDNV(data.orig_creation_tv(), bp);
len -= ts_len;
// Source Endpoint ID of Bundle
int[] EID_len = new int[1];
int num_bytes = SDNV.decode(bp, len, EID_len);
if (num_bytes == -1) {
return false;
}
len -= num_bytes;
if (len != EID_len[0]) {
return false;
}
byte[] source_eid_bytes = new byte[EID_len[0]];
bp.get(source_eid_bytes);
boolean ok = data.orig_source_eid_.assign(source_eid_bytes);
if (!ok) {
return false;
}
return true;
}
