org.jgroups.util.ByteBufferInputStream Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
package org.jgroups.util;
import java.io.*;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
/**
* Class using {@link ByteBuffer} and implementing {@link DataInput}.
* @author Bela Ban
* @since 3.5
*/
public class ByteBufferInputStream implements DataInput {
protected final ByteBuffer buf;
public ByteBufferInputStream(ByteBuffer buf) {
this.buf=buf;
}
public void readFully(byte[] b) throws IOException {
readFully(b, 0, b.length);
}
public void readFully(byte[] b, int off, int len) throws IOException {
try {
buf.get(b, off, len);
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
public int skipBytes(int n) throws IOException {
int skip=Math.min(n, buf.limit() - buf.position());
buf.position(buf.position() + skip);
return skip;
}
public boolean readBoolean() throws IOException {
return readByte() == 1;
}
public byte readByte() throws IOException {
try {
return buf.get();
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
public int readUnsignedByte() throws IOException {
int ch=readByte() & 0xff;
if(ch < 0)
throw new EOFException();
return ch;
}
public short readShort() throws IOException {
try {
return buf.getShort();
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
public int readUnsignedShort() throws IOException {
int retval=readShort() & 0xffff;
if(retval < 0)
throw new EOFException();
return retval;
}
public char readChar() throws IOException {
try {
return buf.getChar();
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
public int readInt() throws IOException {
try {
return buf.getInt();
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
public long readLong() throws IOException {
try {
return buf.getLong();
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
public float readFloat() throws IOException {
try {
return buf.getFloat();
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
public double readDouble() throws IOException {
try {
return buf.getDouble();
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
public String readLine() throws IOException {
char[] lineBuffer=new char[128];
char buffer[] = lineBuffer;
if (buffer == null) {
buffer = lineBuffer = new char[128];
}
int room = buffer.length;
int offset = 0;
int c;
loop: while (true) {
switch (c = readByte()) {
case -1:
case '\n':
break loop;
case '\r':
int c2 = readByte();
if ((c2 != '\n') && (c2 != -1))
;
break loop;
default:
if (--room < 0) {
buffer = new char[offset + 128];
room = buffer.length - offset - 1;
System.arraycopy(lineBuffer, 0, buffer, 0, offset);
lineBuffer = buffer;
}
buffer[offset++] = (char) c;
break;
}
}
if ((c == -1) && (offset == 0)) {
return null;
}
return String.copyValueOf(buffer, 0, offset);
}
public String readUTF() throws IOException {
int utflen = readUnsignedShort();
byte[] bytearr = new byte[utflen];
char[] chararr = new char[utflen];
int c, char2, char3;
int count = 0;
int chararr_count=0;
readFully(bytearr,0,utflen);
while (count < utflen) {
c = (int) bytearr[count] & 0xff;
if (c > 127) break;
count++;
chararr[chararr_count++]=(char)c;
}
while (count < utflen) {
c = (int) bytearr[count] & 0xff;
switch (c >> 4) {
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
/* 0xxxxxxx*/
count++;
chararr[chararr_count++]=(char)c;
break;
case 12: case 13:
/* 110x xxxx 10xx xxxx*/
count += 2;
if (count > utflen)
throw new UTFDataFormatException(
"malformed input: partial character at end");
char2 = (int) bytearr[count-1];
if ((char2 & 0xC0) != 0x80)
throw new UTFDataFormatException(
"malformed input around byte " + count);
chararr[chararr_count++]=(char)(((c & 0x1F) << 6) |
(char2 & 0x3F));
break;
case 14:
/* 1110 xxxx 10xx xxxx 10xx xxxx */
count += 3;
if (count > utflen)
throw new UTFDataFormatException(
"malformed input: partial character at end");
char2 = (int) bytearr[count-2];
char3 = (int) bytearr[count-1];
if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
throw new UTFDataFormatException(
"malformed input around byte " + (count-1));
chararr[chararr_count++]=(char)(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
default:
/* 10xx xxxx, 1111 xxxx */
throw new UTFDataFormatException(
"malformed input around byte " + count);
}
}
// The number of chars produced may be less than utflen
return new String(chararr, 0, chararr_count);
}
public String toString() {
return buf.toString();
}
}