1 package com.android.hotspot2.asn1; 2 3 import java.nio.ByteBuffer; 4 import java.util.Collection; 5 6 public abstract class Asn1Object { 7 private final int mTag; 8 private final Asn1Class mClass; 9 private final boolean mConstructed; 10 private final int mLength; 11 private final ByteBuffer mPayload; 12 13 protected Asn1Object(int tag, Asn1Class asn1Class, boolean constructed, int length) { 14 this(tag, asn1Class, constructed, length, null); 15 } 16 17 protected Asn1Object(int tag, Asn1Class asn1Class, boolean constructed, 18 int length, ByteBuffer payload) { 19 mTag = tag; 20 mClass = asn1Class; 21 mConstructed = constructed; 22 mLength = length; 23 mPayload = payload != null ? payload.duplicate() : null; 24 } 25 26 public int getTag() { 27 return mTag; 28 } 29 30 public Asn1Class getAsn1Class() { 31 return mClass; 32 } 33 34 public boolean isConstructed() { 35 return mConstructed; 36 } 37 38 public boolean isIndefiniteLength() { 39 return mLength == Asn1Decoder.IndefiniteLength; 40 } 41 42 public int getLength() { 43 return mLength; 44 } 45 46 public ByteBuffer getPayload() { 47 return mPayload != null ? mPayload.duplicate() : null; 48 } 49 50 protected ByteBuffer getPayload(int position) { 51 if (mPayload == null) { 52 return null; 53 } 54 ByteBuffer encoding = mPayload.duplicate(); 55 encoding.position(position); 56 return encoding; 57 } 58 59 protected void setEndOfData(int position) { 60 mPayload.limit(position); 61 } 62 63 protected int getEndOfData() { 64 return mPayload.limit(); 65 } 66 67 public boolean matches(Asn1ID id) { 68 return mTag == id.getTag() && mClass == id.getAsn1Class(); 69 } 70 71 public String toSimpleString() { 72 Asn1Tag tag = mClass == Asn1Class.Universal ? Asn1Decoder.mapTag(mTag) : null; 73 if (tag != null) { 74 return tag.name(); 75 } else if (mClass == Asn1Class.Universal) { 76 return String.format("[%d]", mTag); 77 } else { 78 return String.format("[%s %d]", mClass, mTag); 79 } 80 } 81 82 public abstract Collection<Asn1Object> getChildren(); 83 84 @Override 85 public String toString() { 86 return toSimpleString(); 87 } 88 } 89
