Mercurial Hosting > luan
annotate src/goodjava/rpc/FixedLengthInputStream.java @ 1472:60f6741f000a
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| author | Franklin Schmidt <fschmidt@gmail.com> |
|---|---|
| date | Fri, 17 Apr 2020 11:16:38 -0600 |
| parents | 27efb1fcbcb5 |
| children | 9a2a2181a58f |
| rev | line source |
|---|---|
|
1402
27efb1fcbcb5
move luan.lib to goodjava
Franklin Schmidt <fschmidt@gmail.com>
parents:
1118
diff
changeset
|
1 package goodjava.rpc; |
| 1118 | 2 |
| 3 import java.io.InputStream; | |
| 4 import java.io.FilterInputStream; | |
| 5 import java.io.IOException; | |
| 6 import java.io.EOFException; | |
| 7 | |
| 8 | |
| 9 public class FixedLengthInputStream extends FilterInputStream { | |
| 10 private long left; | |
| 11 | |
| 12 public FixedLengthInputStream(InputStream in,long len) { | |
| 13 super(in); | |
| 14 if( len < 0 ) | |
| 15 throw new IllegalArgumentException("len can't be negative"); | |
| 16 this.left = len; | |
| 17 } | |
| 18 | |
| 19 public int read() throws IOException { | |
| 20 if( left == 0 ) | |
| 21 return -1; | |
| 22 int n = in.read(); | |
| 23 if( n == -1 ) | |
| 24 throw new EOFException(); | |
| 25 left--; | |
| 26 return n; | |
| 27 } | |
| 28 | |
| 29 public int read(byte b[], int off, int len) throws IOException { | |
| 30 if( len == 0 ) | |
| 31 return 0; | |
| 32 if( left == 0 ) | |
| 33 return -1; | |
| 34 if( len > left ) | |
| 35 len = (int)left; | |
| 36 int n = in.read(b, off, len); | |
| 37 if( n == -1 ) | |
| 38 throw new EOFException(); | |
| 39 left -= n; | |
| 40 return n; | |
| 41 } | |
| 42 | |
| 43 public long skip(long n) throws IOException { | |
| 44 if( n > left ) | |
| 45 n = left; | |
| 46 n = in.skip(n); | |
| 47 left -= n; | |
| 48 return n; | |
| 49 } | |
| 50 | |
| 51 public int available() throws IOException { | |
| 52 int n = in.available(); | |
| 53 if( n > left ) | |
| 54 n = (int)left; | |
| 55 return n; | |
| 56 } | |
| 57 | |
| 58 public void close() throws IOException { | |
| 59 while( left > 0 ) { | |
| 60 if( skip(left) == 0 ) | |
| 61 throw new EOFException(); | |
| 62 } | |
| 63 } | |
| 64 | |
| 65 public void mark(int readlimit) {} | |
| 66 | |
| 67 public void reset() throws IOException { | |
| 68 throw new IOException("not supported"); | |
| 69 } | |
| 70 | |
| 71 public boolean markSupported() { | |
| 72 return false; | |
| 73 } | |
| 74 | |
| 75 } |