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ru.yandex.clickhouse.response.ByteFragment Maven / Gradle / Ivy
package ru.yandex.clickhouse.response;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
public class ByteFragment {
protected final byte[] buf;
protected final int start;
protected final int len;
private static final ByteFragment EMPTY = new ByteFragment(new byte[0], 0, 0);
public ByteFragment(byte[] buf, int start, int len) {
this.buf = buf;
this.start = start;
this.len = len;
}
public static ByteFragment fromString(String str) {
// https://bugs.openjdk.java.net/browse/JDK-6219899
byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
return new ByteFragment(bytes, 0, bytes.length);
}
public String asString() {
return new String(buf, start, len, StandardCharsets.UTF_8);
}
public String asString(boolean unescape) {
if(unescape) {
if (isNull()) {
return null;
}
return new String(unescape(), StandardCharsets.UTF_8);
} else {
return asString();
}
}
public boolean isNull() {
// \N
return len == 2 && buf[start] == '\\' && buf[start + 1] == 'N';
}
public boolean isEmpty() {
return len == 0;
}
public boolean isNaN() {
// nan
return len == 3 && buf[start] == 'n' && buf[start + 1] == 'a' && buf[start + 2] == 'n';
}
@Override
public String toString() {
StringBuilder b = new StringBuilder();
b.append("ByteFragment{[");
for (byte b1 : buf) {
if (b1 == '\t') {
b.append("");
} else {
b.append((char) b1);
}
}
b.append(']');
b.append(", start=" + start +
", len=" + len +
'}');
return b.toString();
}
public ByteFragment[] split(byte sep) {
StreamSplitter ss = new StreamSplitter(this, sep);
int c = count(sep)+1;
ByteFragment[] res = new ByteFragment[c];
try {
int i = 0;
ByteFragment next = null;
while((next = ss.next())!=null) {
res[i++] = next;
}
} catch (IOException ignore) {
}
if(res[c-1] == null) {
res[c-1] = ByteFragment.EMPTY;
}
return res;
}
// [45, 49, 57, 52, 49, 51, 56, 48, 57, 49, 52, 9, 9, 50, 48, 49, 50, 45, 48, 55, 45, 49, 55, 32, 49, 51, 58, 49, 50, 58, 50, 49, 9, 49, 50, 49, 50, 55, 53, 53, 9, 50, 57, 57, 57, 55, 55, 57, 57, 55, 56, 9, 48, 9, 52, 48, 57, 49, 57, 55, 52, 49, 49, 51, 50, 56, 53, 53, 50, 54, 57, 51, 9, 51, 9, 54, 9, 50, 48, 9, 48, 92, 48, 9, 104, 116, 116, 112, 58, 47, 47, 119, 119, 119, 46, 97, 118, 105, 116, 111, 46, 114, 117, 47, 99, 97, 116, 97, 108, 111, 103, 47, 103, 97, 114, 97, 122, 104, 105, 95, 105, 95, 109, 97, 115, 104, 105, 110, 111, 109, 101, 115, 116, 97, 45, 56, 53, 47, 116, 97, 116, 97, 114, 115, 116, 97, 110, 45, 54, 53, 48, 49, 51, 48, 47, 112, 97, 103, 101, 56, 9, 104, 116, 116, 112, 58, 47, 47, 119, 119, 119, 46, 97, 118, 105, 116, 111, 46, 114, 117, 47, 99, 97, 116, 97, 108, 111, 103, 47, 103, 97, 114, 97, 122, 104, 105, 95, 105, 95, 109, 97, 115, 104, 105, 110, 111, 109, 101, 115, 116, 97, 45, 56, 53, 47, 116, 97, 116, 97, 114, 115, 116, 97, 110, 45, 54, 53, 48, 49, 51, 48, 47, 112, 97, 103, 101, 55, 9, 48, 9, 48, 9, 50, 56, 53, 55, 48, 56, 48, 9, 45, 49, 9, 48, 9, 9, 48, 9, 48, 9, 48, 9, 45, 49, 9, 48, 48, 48, 48, 45, 48, 48, 45, 48, 48, 32, 48, 48, 58, 48, 48, 58, 48, 48, 9, 9, 48, 9, 48, 9, 103, 9, 45, 49, 9, 45, 49, 9, 45, 49, 9]
public ByteArrayInputStream asStream() {
return new ByteArrayInputStream(buf, start, len);
}
private int count(byte sep) {
int res = 0;
for (int i = start; i < start+len; i++) {
if (buf[i] == sep) {
res++;
}
}
return res;
}
public int getLen() {
return len;
}
// "\0" => 0
// "\r" => 13
// "\n" => 10
// "\\" => 92
// "\'" => 39
// "\b" => 8
// "\f" => 12
// "\t" => 9
//null
// "\N" => 0
private static final byte[] convert = {
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 0.. 9
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, //10..19
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, //20..29
-1,-1,-1,-1,-1,-1,-1,-1,-1,39, //30..39
-1,-1,-1,-1,-1,-1,-1,-1, 0,-1, //40..49
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, //50..59
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, //60..69
-1,-1,-1,-1,-1,-1,-1,-1, 0,-1, //70..79
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, //80..89
-1,-1,92,-1,-1,-1,-1,-1, 8,-1, //90..99
-1,-1,12,-1,-1,-1,-1,-1,-1,-1, //100..109
10,-1,-1,-1,13,-1, 9,-1,-1,-1, //110..119
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, //120..129
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
};
// [0xb6][0xfe][0x7][0x1][0xd8][0xd6][0x94][0x80][0x5]\0 html.
// [-74,-2,7,1,-40,-42,-108,-128,5,0] real value
// [-74,-2,7,1,-40,-42,-108,-128,5,92,48] parsed value
public byte[] unescape() {
int resLen = 0;
{
boolean prevSlash = false;
for(int i = start; i < start + len; i++){
if(prevSlash) {
resLen++;
prevSlash = false;
} else {
if(buf[i] == 92) { // slash character
prevSlash = true;
} else {
resLen++;
}
}
}
}
if (resLen == len) {
return getBytesCopy();
}
byte[] res = new byte[resLen];
int index = 0;
{
boolean prevSlash = false;
for(int i = start; i < start + len; i++){
if(prevSlash) {
prevSlash = false;
res[index++] = convert[buf[i]];
} else {
if(buf[i] == 92) { // slash character
prevSlash = true;
} else {
res[index++] = buf[i];
}
}
}
}
return res;
}
final static byte[] reverse;
static {
reverse = new byte[convert.length];
for (int i = 0; i < convert.length; i++) {
reverse[i] = -1;
byte c = convert[i];
if (c != -1) {
reverse[c] = (byte) i;
}
}
}
public static void escape(byte[] bytes, OutputStream stream) throws IOException {
for (byte b : bytes) {
if(b < 0 || b >= reverse.length) {
stream.write(b);
} else {
byte converted = reverse[b];
if (converted != -1) {
stream.write(92);
stream.write(converted);
} else {
stream.write(b);
}
}
}
}
private byte[] getBytesCopy() {
byte[] bytes = new byte[len];
System.arraycopy(buf, start, bytes, 0, len);
return bytes;
}
public int length() {
return len;
}
public int charAt(int i) {
return buf[start+i];
}
public ByteFragment subseq(int start, int len) {
if(start < 0 || start + len > this.len) {
throw new IllegalArgumentException("arg start,len="+(start+","+len)+" while this start,len="+(this.start+","+this.len));
}
return new ByteFragment(buf, this.start+start, len);
}
}
