| 1 | package cz.vutbr.feec.packets.rtcp; |
| 2 | |
| 3 | import java.util.Vector; |
| 4 | |
| 5 | import cz.vutbr.feec.packets.IPacket; |
| 6 | import cz.vutbr.feec.packets.PacketGenerateException; |
| 7 | import cz.vutbr.feec.packets.PacketParseException; |
| 8 | import cz.vutbr.feec.packets.PacketUtils; |
| 9 | import org.apache.commons.lang.builder.ToStringBuilder; |
| 10 | import org.apache.commons.lang.builder.EqualsBuilder; |
| 11 | import org.apache.commons.lang.builder.HashCodeBuilder; |
| 12 | |
| 13 | /** |
| 14 | * The Class SDESChunk. |
| 15 | */ |
| 16 | public class SDESChunk implements IPacket { |
| 17 | |
| 18 | private long SSRC_CSRC; |
| 19 | |
| 20 | private Vector<SDESItem> items = new Vector<SDESItem>(); |
| 21 | |
| 22 | public void addItem(SDESItem item) { |
| 23 | items.add(item); |
| 24 | } |
| 25 | |
| 26 | public SDESItem getItem(int index) { |
| 27 | return items.get(index); |
| 28 | } |
| 29 | |
| 30 | public int getNumberofItems() { |
| 31 | // automaticky pridava END item |
| 32 | return items.size() + 1; |
| 33 | } |
| 34 | |
| 35 | public int generate(byte[] buffer, int offset) |
| 36 | throws PacketGenerateException { |
| 37 | assert PacketUtils.checkSize(getSSRC_CSRC(), 32); |
| 38 | int len = 0; |
| 39 | PacketUtils.setOctet4(buffer, offset + len, getSSRC_CSRC()); |
| 40 | len += 4; |
| 41 | for (SDESItem item : items) { |
| 42 | len += item.generate(buffer, offset + len); |
| 43 | } |
| 44 | PacketUtils.setOctet1(buffer, offset + len + 1, SDESItem.END); |
| 45 | int length = 0; |
| 46 | PacketUtils.setOctet1(buffer, offset + len + 2, length); |
| 47 | |
| 48 | // bound to 32 bit word |
| 49 | len += 2; |
| 50 | len = PacketUtils.bound32(buffer, offset, len); |
| 51 | return len; |
| 52 | } |
| 53 | |
| 54 | public int parse(byte[] buffer, int offset, int length) |
| 55 | throws PacketParseException { |
| 56 | int len = 0; |
| 57 | setSSRC_CSRC(PacketUtils.getOctet4(buffer, offset + len)); |
| 58 | len = len + 4; |
| 59 | int counter = 0; |
| 60 | items.clear(); |
| 61 | while (PacketUtils.getOctet1(buffer, offset + len + 1) != SDESItem.END) { |
| 62 | SDESItem item = new SDESItem(); |
| 63 | len += item.parse(buffer, offset + len, length); |
| 64 | addItem(item); |
| 65 | if (counter > 255) { |
| 66 | throw new PacketParseException("Too Much Items Parsed"); |
| 67 | } |
| 68 | counter++; |
| 69 | } |
| 70 | // bound to 32 bit |
| 71 | len += 2; |
| 72 | len = PacketUtils.bound32(len); |
| 73 | return len; |
| 74 | } |
| 75 | |
| 76 | public long getSSRC_CSRC() { |
| 77 | return SSRC_CSRC; |
| 78 | } |
| 79 | |
| 80 | public void setSSRC_CSRC(long ssrc_csrc) { |
| 81 | SSRC_CSRC = ssrc_csrc; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * @see java.lang.Object#toString() |
| 86 | */ |
| 87 | public String toString() { |
| 88 | return new ToStringBuilder(this).append("items", this.items).append( |
| 89 | "SSRC_CSRC", this.SSRC_CSRC).toString(); |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @see java.lang.Object#equals(Object) |
| 94 | */ |
| 95 | public boolean equals(Object object) { |
| 96 | if (!(object instanceof SDESChunk)) { |
| 97 | return false; |
| 98 | } |
| 99 | SDESChunk rhs = (SDESChunk) object; |
| 100 | return new EqualsBuilder().append(this.items, rhs.items).append( |
| 101 | this.SSRC_CSRC, rhs.SSRC_CSRC).isEquals(); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * @see java.lang.Object#hashCode() |
| 106 | */ |
| 107 | public int hashCode() { |
| 108 | return new HashCodeBuilder(-572145375, -537819921).append(this.items) |
| 109 | .append(this.SSRC_CSRC).toHashCode(); |
| 110 | } |
| 111 | |
| 112 | } |