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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.slime;
import com.yahoo.compress.Compressor;
/**
* Class for serializing Slime data into binary format, or deserializing
* the binary format into a Slime object.
*/
public class BinaryFormat {
static long encode_zigzag(long x) {
return ((x << 1) ^ (x >> 63)); // note ASR
}
static long decode_zigzag(long x) {
return ((x >>> 1) ^ (-(x & 0x1))); // note LSR
}
static long encode_double(double x) {
return Double.doubleToRawLongBits(x);
}
static double decode_double(long x) {
return Double.longBitsToDouble(x);
}
static byte encode_type_and_meta(int type, int meta) {
return (byte) ((meta << 3) | (type & 0x7));
}
static Type decode_type(byte type_and_meta) {
return Type.asType(type_and_meta & 0x7);
}
static int decode_meta(byte type_and_meta) {
return ((type_and_meta & 0xff) >>> 3);
}
/**
* Take a Slime object and serialize it into binary format.
* @param slime the object which is to be serialized.
* @return a new byte array with just the encoded slime.
**/
public static byte[] encode(Slime slime) {
return new BinaryEncoder().encode(slime).toArray();
}
/**
* Take a Slime object and serialize it into binary format, and compresses it.
* @param slime the object which is to be serialized.
* @param compressor the compressor to use.
* @return a new byte array with just the encoded and compressed slime.
**/
public static Compressor.Compression encode_and_compress(Slime slime, Compressor compressor) {
return new BinaryEncoder().encode(slime).compress(compressor);
}
/**
* Take binary data and deserialize it into a Slime object.
* The data is assumed to be the binary representation
* as if obtained by a call to the @ref encode() method.
*
* If the binary data can't be deserialized without problems
* the returned Slime object will instead only contain the
* three fields "partial_result" (contains anything successfully
* decoded before encountering problems), "offending_input"
* (containing any data that could not be deserialized) and
* "error_message" (a string describing the problem encountered).
*
* @param data the data to be deserialized.
* @return a new Slime object constructed from the data.
**/
public static Slime decode(byte[] data) {
BinaryDecoder decoder = new BinaryDecoder();
return decoder.decode(data);
}
/**
* Take binary data and deserialize it into a Slime object.
* The data is assumed to be the binary representation
* as if obtained by a call to the @ref encode() method.
*
* If the binary data can't be deserialized without problems
* the returned Slime object will instead only contain the
* three fields "partial_result" (contains anything successfully
* decoded before encountering problems), "offending_input"
* (containing any data that could not be deserialized) and
* "error_message" (a string describing the problem encountered).
*
* @param data array containing the data to be deserialized.
* @param offset where in the array to start deserializing.
* @param length how many bytes the deserializer is allowed to consume.
* @return a new Slime object constructed from the data.
**/
public static Slime decode(byte[] data, int offset, int length) {
BinaryDecoder decoder = new BinaryDecoder();
return decoder.decode(data, offset, length);
}
}
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