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/*
* Copyright The OpenZipkin Authors
* SPDX-License-Identifier: Apache-2.0
*/
package zipkin2.internal;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import static java.nio.charset.StandardCharsets.UTF_8;
import static zipkin2.internal.HexCodec.HEX_DIGITS;
/** Read operations do bounds checks, as typically more errors occur reading than writing. */
public abstract class ReadBuffer extends InputStream {
/** Do not use the buffer passed here after, as it may be manipulated directly. */
public static ReadBuffer wrapUnsafe(ByteBuffer buffer) {
if (buffer.hasArray()) {
int offset = buffer.arrayOffset() + buffer.position();
return wrap(buffer.array(), offset, buffer.remaining());
}
return buffer.order() == ByteOrder.BIG_ENDIAN
? new BigEndianByteBuffer(buffer)
: new LittleEndianByteBuffer(buffer);
}
public static ReadBuffer wrap(byte[] bytes) {
return wrap(bytes, 0, bytes.length);
}
public static ReadBuffer wrap(byte[] bytes, int pos, int length) {
return new ReadBuffer.Array(bytes, pos, length);
}
static final class BigEndianByteBuffer extends Buff {
BigEndianByteBuffer(ByteBuffer buf) {
super(buf);
}
@Override short readShort() {
require(2);
return buf.getShort();
}
@Override int readInt() {
require(4);
return buf.getInt();
}
@Override long readLong() {
require(8);
return buf.getLong();
}
@Override long readLongLe() {
return Long.reverseBytes(readLong());
}
}
static final class LittleEndianByteBuffer extends Buff {
LittleEndianByteBuffer(ByteBuffer buf) {
super(buf);
}
@Override short readShort() {
require(2);
return Short.reverseBytes(buf.getShort());
}
@Override int readInt() {
require(4);
return Integer.reverseBytes(buf.getInt());
}
@Override long readLong() {
return Long.reverseBytes(readLongLe());
}
@Override long readLongLe() {
require(8);
return buf.getLong();
}
}
static abstract class Buff extends ReadBuffer {
final ByteBuffer buf; // visible for testing
Buff(ByteBuffer buf) {
this.buf = buf;
}
@Override final byte readByteUnsafe() {
return buf.get();
}
@Override final byte[] readBytes(int length) {
require(length);
byte[] copy = new byte[length];
buf.get(copy);
return copy;
}
// Encoding zipkin data is supported in JRE 6, but decoding isn't.
@Override boolean tryReadAscii(char[] destination, int length) {
buf.mark(); // This is not Java 6
for (int i = 0; i < length; i++) {
byte b = buf.get();
if ((b & 0x80) != 0) {
buf.reset(); // This is not Java 6
return false; // Not 7-bit ASCII character
}
destination[i] = (char) b;
}
return true;
}
@Override final String doReadUtf8(int length) {
return new String(readBytes(length), UTF_8);
}
@Override public int pos() {
return buf.position();
}
@Override public int read(byte[] dst, int offset, int length) {
if (available() == 0) return -1;
int toRead = checkReadArguments(dst, offset, length);
if (toRead == 0) return 0;
buf.get(dst, offset, toRead);
return toRead;
}
// Encoding zipkin data is supported in JRE 6, but decoding isn't.
@Override public long skip(long maxCount) {
int skipped = Math.max(available(), (int) maxCount);
buf.position(buf.position() + skipped); // This is not Java 6
return skipped;
}
@Override public int available() {
return buf.remaining();
}
}
static final class Array extends ReadBuffer {
final byte[] buf;
final int arrayOffset, length;
int offset;
Array(byte[] buf, int offset, int length) {
this.buf = buf;
this.arrayOffset = this.offset = offset;
this.length = length;
}
@Override byte readByteUnsafe() {
return buf[offset++];
}
@Override byte[] readBytes(int length) {
require(length);
byte[] result = new byte[length];
System.arraycopy(buf, offset, result, 0, length);
offset += length;
return result;
}
@Override public int read(byte[] dst, int offset, int length) {
if (available() == 0) return -1;
int toRead = checkReadArguments(dst, offset, length);
if (toRead == 0) return 0;
System.arraycopy(buf, this.offset, dst, 0, toRead);
this.offset += toRead;
return toRead;
}
@Override boolean tryReadAscii(char[] destination, int length) {
for (int i = 0; i < length; i++) {
byte b = buf[offset + i];
if ((b & 0x80) != 0) return false; // Not 7-bit ASCII character
destination[i] = (char) b;
}
offset += length;
return true;
}
@Override String doReadUtf8(int length) {
String result = new String(buf, offset, length, UTF_8);
offset += length;
return result;
}
@Override short readShort() {
require(2);
return (short) ((buf[offset++] & 0xff) << 8 | (buf[offset++] & 0xff));
}
@Override int readInt() {
require(4);
int pos = this.offset;
this.offset = pos + 4;
return (buf[pos] & 0xff) << 24
| (buf[pos + 1] & 0xff) << 16
| (buf[pos + 2] & 0xff) << 8
| (buf[pos + 3] & 0xff);
}
/** Code is optimized for little endian as proto is the encouraged format. */
@Override long readLong() {
return Long.reverseBytes(readLongLe());
}
@Override long readLongLe() {
require(8);
int pos = this.offset;
this.offset = pos + 8;
return (buf[pos] & 0xffL)
| (buf[pos + 1] & 0xffL) << 8
| (buf[pos + 2] & 0xffL) << 16
| (buf[pos + 3] & 0xffL) << 24
| (buf[pos + 4] & 0xffL) << 32
| (buf[pos + 5] & 0xffL) << 40
| (buf[pos + 6] & 0xffL) << 48
| (buf[pos + 7] & 0xffL) << 56;
}
@Override public int pos() {
return offset - arrayOffset;
}
@Override public long skip(long maxCount) {
int toSkip = Math.min(available(), (int) maxCount);
offset += toSkip;
return toSkip;
}
@Override public int available() {
return length - (offset - arrayOffset);
}
}
@Override public abstract int read(byte[] dst, int offset, int length);
@Override public abstract long skip(long n);
@Override public abstract int available();
@Override public void close() {
}
@Override public void mark(int readlimit) {
throw new UnsupportedOperationException();
}
@Override public synchronized void reset() {
throw new UnsupportedOperationException();
}
@Override public boolean markSupported() {
return false;
}
/** only use when you've already ensured the length you need is available */
abstract byte readByteUnsafe();
final byte readByte() {
require(1);
return readByteUnsafe();
}
abstract byte[] readBytes(int length);
final String readUtf8(int length) {
if (length == 0) return ""; // ex error tag with no value
require(length);
if (length > RecyclableBuffers.SHORT_STRING_LENGTH) return doReadUtf8(length);
// Speculatively assume all 7-bit ASCII characters.. common in normal tags and names
char[] buffer = RecyclableBuffers.shortStringBuffer();
if (tryReadAscii(buffer, length)) {
return new String(buffer, 0, length);
}
return doReadUtf8(length);
}
abstract boolean tryReadAscii(char[] destination, int length);
abstract String doReadUtf8(int length);
abstract int pos();
abstract short readShort();
abstract int readInt();
abstract long readLong();
abstract long readLongLe();
@Override public final int read() {
return available() > 0 ? readByteUnsafe() : -1;
}
final String readBytesAsHex(int length) {
// All our hex fields are at most 32 characters.
if (length > 32) {
throw new IllegalArgumentException("hex field greater than 32 chars long: " + length);
}
require(length);
char[] result = RecyclableBuffers.shortStringBuffer();
int hexLength = length * 2;
for (int i = 0; i < hexLength; i += 2) {
byte b = readByteUnsafe();
result[i + 0] = HEX_DIGITS[(b >> 4) & 0xf];
result[i + 1] = HEX_DIGITS[b & 0xf];
}
return new String(result, 0, hexLength);
}
/**
* @return the value read. Use {@link WriteBuffer#varintSizeInBytes(long)} to tell how many bytes.
* @throws IllegalArgumentException if more than 64 bits were encoded
*/
// included in the main api as this is used commonly, for example reading proto tags
final int readVarint32() {
byte b; // negative number implies MSB set
if ((b = readByte()) >= 0) {
return b;
}
int result = b & 0x7f;
if ((b = readByte()) >= 0) {
return result | b << 7;
}
result |= (b & 0x7f) << 7;
if ((b = readByte()) >= 0) {
return result | b << 14;
}
result |= (b & 0x7f) << 14;
if ((b = readByte()) >= 0) {
return result | b << 21;
}
result |= (b & 0x7f) << 21;
b = readByte();
if ((b & 0xf0) != 0) {
throw new IllegalArgumentException("Greater than 32-bit varint at position " + (pos() - 1));
}
return result | b << 28;
}
final long readVarint64() {
byte b; // negative number implies MSB set
if ((b = readByte()) >= 0) {
return b;
}
long result = b & 0x7f;
for (int i = 1; b < 0 && i < 10; i++) {
b = readByte();
if (i == 9 && (b & 0xf0) != 0) {
throw new IllegalArgumentException("Greater than 64-bit varint at position " + (pos() - 1));
}
result |= (long) (b & 0x7f) << (i * 7);
}
return result;
}
final void require(int byteCount) {
if (this.available() < byteCount) {
throw new IllegalArgumentException(
"Truncated: length " + byteCount + " > bytes available " + this.available());
}
}
int checkReadArguments(byte[] dst, int offset, int length) {
if (dst == null) throw new NullPointerException();
if (offset < 0 || length < 0 || length > dst.length - offset) {
throw new IndexOutOfBoundsException();
}
return Math.min(available(), length);
}
}
