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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.fusesource.hawtbuf;
import java.io.*;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
/**
* @author Hiram Chirino
*/
public class Buffer implements Comparable {
public byte[] data;
public int offset;
public int length;
public Buffer(ByteBuffer other) {
this(other.array(), other.arrayOffset()+other.position(), other.remaining());
}
public Buffer(Buffer other) {
this(other.data, other.offset, other.length);
}
public Buffer(int size) {
this(new byte[size]);
}
public Buffer(byte data[]) {
this(data, 0, data.length);
}
public Buffer(byte data[], int offset, int length) {
assert data!=null : "data cannot be null";
assert offset+length <= data.length : String.format("offset %d + length %d must be <= the data.length %d",offset, length, data.length);
this.data = data;
this.offset = offset;
this.length = length;
}
public String hex() {
return HexSupport.toHexFromBuffer(this);
}
public final Buffer flip() {
length = offset;
offset = 0;
return this;
}
public final Buffer moveHead(int value) {
assert value <= length : "Head position cannot be advanced past the tail";
int newOffset = offset+value;
assert newOffset >= 0 : "Head position cannot be moved back past the start of the buffer";
offset = newOffset;
length -= value;
return this;
}
public final Buffer moveTail(int value) {
int newLength = length+value;
assert offset+newLength <= data.length : "Tail position cannot be advanced past the end of the buffer";
assert newLength >= 0 : "Tail position cannot be moved back past head of the buffer";
length = newLength;
return this;
}
public final Buffer clear() {
length = data.length;
offset = 0;
return this;
}
public final Buffer slice(int low, int high) {
int sz;
if (high < 0) {
sz = length + high;
} else {
sz = high - low;
}
if (sz < 0) {
sz = 0;
}
return new Buffer(data, (offset + low), sz);
}
public final byte[] getData() {
return data;
}
public final Buffer data(byte[] data) {
this.data = data;
return this;
}
public final int getLength() {
return length;
}
public final int length() {
return length;
}
public final Buffer length(int length) {
this.length = length;
return this;
}
public final int getOffset() {
return offset;
}
public final Buffer offset(int offset) {
this.offset = offset;
return this;
}
final public Buffer deepCopy() {
byte t[] = new byte[length];
System.arraycopy(data, offset, t, 0, length);
return new Buffer(t);
}
final public Buffer compact() {
if (length != data.length) {
return new Buffer(toByteArray());
}
return this;
}
final public byte[] toByteArray() {
byte[] data = this.data;
int length = this.length;
if (length != data.length) {
byte t[] = new byte[length];
System.arraycopy(data, offset, t, 0, length);
data = t;
}
return data;
}
final public byte get(int i) {
return data[offset + i];
}
final public boolean equals(Buffer obj) {
byte[] data = this.data;
int offset = this.offset;
int length = this.length;
if (length != obj.length) {
return false;
}
byte[] objData = obj.data;
int objOffset = obj.offset;
for (int i = 0; i < length; i++) {
if (objData[objOffset + i] != data[offset + i]) {
return false;
}
}
return true;
}
final public BufferInputStream in() {
return new BufferInputStream(this);
}
final public BufferOutputStream out() {
return new BufferOutputStream(this);
}
final public BufferEditor bigEndianEditor() {
return new BufferEditor.BigEndianBufferEditor(this);
}
final public BufferEditor littleEndianEditor() {
return new BufferEditor.LittleEndianBufferEditor(this);
}
final public boolean isEmpty() {
return length == 0;
}
final public boolean contains(byte value) {
return indexOf(value, 0) >= 0;
}
final public int indexOf(byte value) {
return indexOf(value, 0);
}
final public int indexOf(byte value, int pos) {
byte[] data = this.data;
int offset = this.offset;
int length = this.length;
for (int i = pos; i < length; i++) {
if (data[offset + i] == value) {
return i;
}
}
return -1;
}
final public boolean startsWith(Buffer other) {
return indexOf(other, 0)==0;
}
final public int indexOf(Buffer needle) {
return indexOf(needle, 0);
}
final public int indexOf(Buffer needle, int pos) {
int max = length - needle.length;
for (int i = pos; i <= max; i++) {
if (matches(needle, i)) {
return i;
}
}
return -1;
}
final public boolean containsAt(Buffer needle, int pos) {
if( (length-pos) < needle.length ) {
return false;
}
return matches(needle, pos);
}
final private boolean matches(Buffer needle, int pos) {
byte[] data = this.data;
int offset = this.offset;
int needleLength = needle.length;
byte[] needleData = needle.data;
int needleOffset = needle.offset;
for (int i = 0; i < needleLength; i++) {
if( data[offset + pos+ i] != needleData[needleOffset + i] ) {
return false;
}
}
return true;
}
final public Buffer trim() {
return trimFront().trimEnd();
}
final public Buffer trimEnd() {
byte data[] = this.data;
int offset = this.offset;
int length = this.length;
int end = offset+this.length-1;
int pos = end;
while ((offset <= pos) && (data[pos] <= ' ')) {
pos--;
}
return (pos == end) ? this : new Buffer(data, offset, (length-(end-pos)));
}
final public Buffer trimFront() {
byte data[] = this.data;
int offset = this.offset;
int end = offset+this.length;
int pos = offset;
while ((pos < end) && (data[pos] <= ' ')) {
pos++;
}
return (pos == offset) ? this : new Buffer(data, pos, (length-(pos-offset)));
}
final public Buffer buffer() {
return new Buffer(this);
}
final public AsciiBuffer ascii() {
return new AsciiBuffer(this);
}
final public UTF8Buffer utf8() {
return new UTF8Buffer(this);
}
final public Buffer[] split(byte separator) {
ArrayList rc = new ArrayList();
byte data[] = this.data;
int pos = this.offset;
int nextStart = pos;
int end = pos+this.length;
while( pos < end ) {
if( data[pos]==separator ) {
if( nextStart < pos ) {
rc.add(new Buffer(data, nextStart, (pos-nextStart)));
}
nextStart = pos+1;
}
pos++;
}
if( nextStart < pos ) {
rc.add(new Buffer(data, nextStart, (pos-nextStart)));
}
return rc.toArray(new Buffer[rc.size()]);
}
public void reset() {
offset = 0;
length = data.length;
}
///////////////////////////////////////////////////////////////////
// Overrides
///////////////////////////////////////////////////////////////////
@Override
public int hashCode() {
byte[] data = this.data;
int offset = this.offset;
int length = this.length;
byte[] target = new byte[4];
for (int i = 0; i < length; i++) {
target[i % 4] ^= data[offset + i];
}
return target[0] << 24 | target[1] << 16 | target[2] << 8 | target[3];
}
@Override
public boolean equals(Object obj) {
if (obj == this)
return true;
if (obj == null || obj.getClass() != Buffer.class)
return false;
return equals((Buffer) obj);
}
public int compareTo(Buffer o) {
if( this == o )
return 0;
byte[] data = this.data;
int offset = this.offset;
int length = this.length;
int oLength = o.length;
int oOffset = o.offset;
byte[] oData = o.data;
int minLength = Math.min(length, oLength);
if (offset == oOffset) {
int pos = offset;
int limit = minLength + offset;
while (pos < limit) {
int b1 = 0xFF & data[pos];
int b2 = 0xFF & oData[pos];
if (b1 != b2) {
return b1 - b2;
}
pos++;
}
} else {
int offset1 = offset;
int offset2 = oOffset;
while ( minLength-- != 0) {
int b1 = 0xFF & data[offset1++];
int b2 = 0xFF & oData[offset2++];
if (b1 != b2) {
return b1 - b2;
}
}
}
return length - oLength;
}
/**
* same as out.write(data, offset, length);
*/
public void writeTo(DataOutput out) throws IOException {
out.write(data, offset, length);
}
/**
* same as out.write(data, offset, length);
*/
public void writeTo(OutputStream out) throws IOException {
out.write(data, offset, length);
}
/**
* same as in.readFully(data, offset, length);
*/
public void readFrom(DataInput in) throws IOException {
in.readFully(data, offset, length);
}
/**
* same as in.read(data, offset, length);
*/
public int readFrom(InputStream in) throws IOException {
return in.read(data, offset, length);
}
///////////////////////////////////////////////////////////////////
// Statics
///////////////////////////////////////////////////////////////////
public static String string(Buffer value) {
if( value==null ) {
return null;
}
return value.toString();
}
final public static Buffer join(List items, Buffer seperator) {
if (items.isEmpty())
return new Buffer(seperator.data, 0, 0);
int size = 0;
for (Buffer item : items) {
size += item.length;
}
size += seperator.length * (items.size() - 1);
int pos = 0;
byte data[] = new byte[size];
for (Buffer item : items) {
if (pos != 0) {
System.arraycopy(seperator.data, seperator.offset, data, pos, seperator.length);
pos += seperator.length;
}
System.arraycopy(item.data, item.offset, data, pos, item.length);
pos += item.length;
}
return new Buffer(data, 0, size);
}
public ByteBuffer toByteBuffer() {
return ByteBuffer.wrap(data, offset, length);
}
public static AsciiBuffer ascii(String value) {
return AsciiBuffer.ascii(value);
}
public static AsciiBuffer ascii(Buffer buffer) {
return AsciiBuffer.ascii(buffer);
}
public static UTF8Buffer utf8(String value) {
return UTF8Buffer.utf8(value);
}
public static UTF8Buffer utf8(Buffer buffer) {
return UTF8Buffer.utf8(buffer);
}
@Override
public String toString() {
int size = length;
boolean asciiPrintable = true;
for( int i=0; i < size; i++ ) {
int c = data[offset+i] & 0xFF;
if( c > 126 || c < 32 ) { // not a printable char
if( !(c=='\n' || c=='\r' | c=='\n' | c==27) ) { // except these.
asciiPrintable = false;
break;
}
}
}
if( asciiPrintable ) {
return "ascii: "+ascii();
} else {
return "hex: "+HexSupport.toHexFromBuffer(this);
}
}
}