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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 static com.yahoo.slime.BinaryFormat.encode_double;
import static com.yahoo.slime.BinaryFormat.encode_type_and_meta;
import static com.yahoo.slime.BinaryFormat.encode_zigzag;
final class BinaryEncoder implements ArrayTraverser, ObjectSymbolTraverser {
private final BufferedOutput out;
BinaryEncoder() {
this(new BufferedOutput());
}
BinaryEncoder(BufferedOutput output) {
out = output;
}
BufferedOutput encode(Slime slime) {
out.reset();
encodeSymbolTable(slime);
encodeValue(slime.get());
return out;
}
void encode_cmpr_int(int value) {
byte next = (byte)(value & 0x7f);
value >>>= 7; // unsigned shift
while (value != 0) {
next |= (byte)0x80;
out.put(next);
next = (byte)(value & 0x7f);
value >>>= 7;
}
out.put(next);
}
void write_type_and_size(int type, int size) {
if (size <= 30) {
out.put(encode_type_and_meta(type, size + 1));
} else {
out.put(encode_type_and_meta(type, 0));
encode_cmpr_int(size);
}
}
void write_type_and_bytes_le(int type, long bits) {
int pos = out.position();
byte val = 0;
out.put(val);
while (bits != 0) {
val = (byte)(bits & 0xff);
bits >>>= 8;
out.put(val);
}
val = encode_type_and_meta(type, out.position() - pos - 1);
out.absolutePut(pos, val);
}
void write_type_and_bytes_be(int type, long bits) {
int pos = out.position();
byte val = 0;
out.put(val);
while (bits != 0) {
val = (byte)(bits >> 56);
bits <<= 8;
out.put(val);
}
val = encode_type_and_meta(type, out.position() - pos - 1);
out.absolutePut(pos, val);
}
void encodeNIX() {
out.put(Type.NIX.ID);
}
void encodeBOOL(boolean value) {
out.put(encode_type_and_meta(Type.BOOL.ID, value ? 1 : 0));
}
void encodeLONG(long value) {
write_type_and_bytes_le(Type.LONG.ID, encode_zigzag(value));
}
void encodeDOUBLE(double value) {
write_type_and_bytes_be(Type.DOUBLE.ID, encode_double(value));
}
void encodeSTRING(byte[] value) {
write_type_and_size(Type.STRING.ID, value.length);
out.put(value);
}
void encodeDATA(byte[] value) {
write_type_and_size(Type.DATA.ID, value.length);
out.put(value);
}
void encodeARRAY(Inspector inspector) {
write_type_and_size(Type.ARRAY.ID, inspector.children());
ArrayTraverser at = this;
inspector.traverse(at);
}
void encodeOBJECT(Inspector inspector) {
write_type_and_size(Type.OBJECT.ID, inspector.children());
ObjectSymbolTraverser ot = this;
inspector.traverse(ot);
}
void encodeValue(Inspector inspector) {
switch(inspector.type()) {
case NIX: encodeNIX(); return;
case BOOL: encodeBOOL(inspector.asBool()); return;
case LONG: encodeLONG(inspector.asLong()); return;
case DOUBLE: encodeDOUBLE(inspector.asDouble()); return;
case STRING: encodeSTRING(inspector.asUtf8()); return;
case DATA: encodeDATA(inspector.asData()); return;
case ARRAY: encodeARRAY(inspector); return;
case OBJECT: encodeOBJECT(inspector); return;
}
assert false : "Should not be reached";
}
void encodeSymbolTable(Slime slime) {
int numSymbols = slime.symbols();
encode_cmpr_int(numSymbols);
for (int i = 0 ; i < numSymbols; ++i) {
String name = slime.inspect(i);
byte[] bytes = Utf8Codec.encode(name);
encode_cmpr_int(bytes.length);
out.put(bytes);
}
}
public void entry(int idx, Inspector inspector) {
encodeValue(inspector);
}
public void field(int symbol, Inspector inspector) {
encode_cmpr_int(symbol);
encodeValue(inspector);
}
}
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