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Steal velocity VarInt optimization

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This commit is contained in:
TheMode 2021-05-09 07:36:09 +02:00
parent 7ac0834123
commit 5d7a49c009
2 changed files with 23 additions and 31 deletions
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52
src/main/java/net/minestom/server/utils/Utils.java
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@ -25,42 +25,34 @@ public final class Utils {
? 4 : 5;
}
public static void writeVarIntBuf(ByteBuf buffer, int value) {
do {
byte temp = (byte) (value & 0b01111111);
value >>>= 7;
if (value != 0) {
temp |= 0b10000000;
public static void writeVarIntBuf(ByteBuf buf, int value) {
// Took from velocity
if ((value & (0xFFFFFFFF << 7)) == 0) {
buf.writeByte(value);
} else if ((value & (0xFFFFFFFF << 14)) == 0) {
int w = (value & 0x7F | 0x80) << 8 | (value >>> 7);
buf.writeShort(w);
} else if ((value & (0xFFFFFFFF << 21)) == 0) {
int w = (value & 0x7F | 0x80) << 16 | ((value >>> 7) & 0x7F | 0x80) << 8 | (value >>> 14);
buf.writeMedium(w);
} else {
// Naive loop
while (true) {
if ((value & 0xFFFFFF80) == 0) {
buf.writeByte(value);
return;
}
buf.writeByte(value & 0x7F | 0x80);
value >>>= 7;
}
buffer.writeByte(temp);
} while (value != 0);
}
public static void writeVarInt(BinaryWriter writer, int value) {
do {
byte temp = (byte) (value & 0b01111111);
value >>>= 7;
if (value != 0) {
temp |= 0b10000000;
}
writer.writeByte(temp);
} while (value != 0);
}
}
public static void overrideVarIntHeader(@NotNull ByteBuf buffer, int startIndex, int value) {
final int indexCache = buffer.writerIndex();
buffer.writerIndex(startIndex);
for (int i = 0; i < VARINT_HEADER_SIZE; i++) {
byte temp = (byte) (value & 0b01111111);
value >>>= 7;
if (value != 0 || i != VARINT_HEADER_SIZE - 1) {
temp |= 0b10000000;
}
buffer.writeByte(temp);
}
final int w = (value & 0x7F | 0x80) << 16 | ((value >>> 7) & 0x7F | 0x80) << 8 | (value >>> 14);
buffer.writeMedium(w);
buffer.writerIndex(indexCache);
}

2
src/main/java/net/minestom/server/utils/binary/BinaryWriter.java
View File

@ -152,7 +152,7 @@ public class BinaryWriter extends OutputStream {
* @param i the int to write
*/
public void writeVarInt(int i) {
Utils.writeVarInt(this, i);
Utils.writeVarIntBuf(buffer, i);
}
/**