50 lines
994 B
Java
50 lines
994 B
Java
package net.minecraft.network;
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import io.netty.buffer.ByteBuf;
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public class VarInt {
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private static final int MAX_VARINT_SIZE = 5;
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private static final int DATA_BITS_MASK = 127;
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private static final int CONTINUATION_BIT_MASK = 128;
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private static final int DATA_BITS_PER_BYTE = 7;
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public static int getByteSize(int data) {
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for (int i = 1; i < 5; i++) {
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if ((data & -1 << i * 7) == 0) {
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return i;
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}
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}
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return 5;
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}
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public static boolean hasContinuationBit(byte data) {
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return (data & 128) == 128;
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}
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public static int read(ByteBuf buffer) {
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int i = 0;
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int j = 0;
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byte b;
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do {
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b = buffer.readByte();
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i |= (b & 127) << j++ * 7;
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if (j > 5) {
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throw new RuntimeException("VarInt too big");
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}
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} while (hasContinuationBit(b));
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return i;
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}
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public static ByteBuf write(ByteBuf buffer, int value) {
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while ((value & -128) != 0) {
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buffer.writeByte(value & 127 | 128);
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value >>>= 7;
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}
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buffer.writeByte(value);
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return buffer;
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}
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}
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