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// java.io.InputStream
// An implementation of the Java Language Specification section 20.3
// Written by Charles Briscoe-Smith; refer to the file LEGAL for details.
package java.io;
public abstract class InputStream {
public abstract int read() throws IOException;
public int read(byte[] b)
throws IOException, NullPointerException
{
return read(b, 0, b.length);
}
public int read(byte[] b, int off, int len)
throws IOException, NullPointerException,
IndexOutOfBoundsException
{
int bytes=0;
if (off<0 || len<0 || off+len>b.length) {
throw new IndexOutOfBoundsException();
}
try {
while (len-->0) {
int ch=read();
if (ch==-1) return (bytes==0) ? -1 : bytes;
b[off++]=(byte) ch;
bytes++;
}
} catch (IOException e) {
if (bytes==0) throw e;
}
return bytes;
}
public long skip(long n) throws IOException
{
long skipped=0;
try {
while (n-->0) {
if (read()==-1) {
return skipped;
}
skipped++;
}
} catch (IOException e) {
if (skipped==0) throw e;
}
return skipped;
}
public int available() throws IOException
{
return 0;
}
public void close() throws IOException { }
public void mark(int readlimit) { }
public void reset() throws IOException
{
throw new IOException(this+" does not support reset()");
}
public boolean markSupported()
{
return false;
}
}
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