1 package org.bouncycastle.asn1; 2 3 import java.io.IOException; 4 import java.io.InputStream; 5 6 class ConstructedOctetStream 7 extends InputStream 8 { 9 private final ASN1StreamParser _parser; 10 11 private boolean _first = true; 12 private InputStream _currentStream; 13 ConstructedOctetStream( ASN1StreamParser parser)14 ConstructedOctetStream( 15 ASN1StreamParser parser) 16 { 17 _parser = parser; 18 } 19 read(byte[] b, int off, int len)20 public int read(byte[] b, int off, int len) throws IOException 21 { 22 if (_currentStream == null) 23 { 24 if (!_first) 25 { 26 return -1; 27 } 28 29 ASN1OctetStringParser s = (ASN1OctetStringParser)_parser.readObject(); 30 31 if (s == null) 32 { 33 return -1; 34 } 35 36 _first = false; 37 _currentStream = s.getOctetStream(); 38 } 39 40 int totalRead = 0; 41 42 for (;;) 43 { 44 int numRead = _currentStream.read(b, off + totalRead, len - totalRead); 45 46 if (numRead >= 0) 47 { 48 totalRead += numRead; 49 50 if (totalRead == len) 51 { 52 return totalRead; 53 } 54 } 55 else 56 { 57 ASN1OctetStringParser aos = (ASN1OctetStringParser)_parser.readObject(); 58 59 if (aos == null) 60 { 61 _currentStream = null; 62 return totalRead < 1 ? -1 : totalRead; 63 } 64 65 _currentStream = aos.getOctetStream(); 66 } 67 } 68 } 69 read()70 public int read() 71 throws IOException 72 { 73 if (_currentStream == null) 74 { 75 if (!_first) 76 { 77 return -1; 78 } 79 80 ASN1OctetStringParser s = (ASN1OctetStringParser)_parser.readObject(); 81 82 if (s == null) 83 { 84 return -1; 85 } 86 87 _first = false; 88 _currentStream = s.getOctetStream(); 89 } 90 91 for (;;) 92 { 93 int b = _currentStream.read(); 94 95 if (b >= 0) 96 { 97 return b; 98 } 99 100 ASN1OctetStringParser s = (ASN1OctetStringParser)_parser.readObject(); 101 102 if (s == null) 103 { 104 _currentStream = null; 105 return -1; 106 } 107 108 _currentStream = s.getOctetStream(); 109 } 110 } 111 } 112