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VarInt: use constants for possible sizes

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This commit is contained in:
Andreas Schildbach 2023-03-27 16:42:48 +02:00
parent 140912b080
commit 3746516859
1 changed files with 14 additions and 9 deletions
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23
core/src/main/java/org/bitcoinj/base/VarInt.java
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@ -32,6 +32,11 @@ public class VarInt {
private final long value;
private final int originallyEncodedSize;
private static final int SIZE_BYTE = Byte.BYTES; // 1 data byte
private static final int SIZE_SHORT = Byte.BYTES + Short.BYTES; // 1 marker + 2 data bytes
private static final int SIZE_INT = Byte.BYTES + Integer.BYTES; // 1 marker + 4 data bytes
private static final int SIZE_LONG = Byte.BYTES + Long.BYTES; // 1 marker + 8 data bytes
/**
* Constructs a new VarInt with the given unsigned long value.
*
@ -68,16 +73,16 @@ public class VarInt {
int originallyEncodedSize;
if (first < 253) {
value = first;
originallyEncodedSize = 1; // 1 data byte (8 bits)
originallyEncodedSize = SIZE_BYTE;
} else if (first == 253) {
value = Short.toUnsignedInt(buf.getShort());
originallyEncodedSize = 3; // 1 marker + 2 data bytes (16 bits)
originallyEncodedSize = SIZE_SHORT;
} else if (first == 254) {
value = Integer.toUnsignedLong(buf.getInt());
originallyEncodedSize = 5; // 1 marker + 4 data bytes (32 bits)
originallyEncodedSize = SIZE_INT;
} else {
value = buf.getLong();
originallyEncodedSize = 9; // 1 marker + 8 data bytes (64 bits)
originallyEncodedSize = SIZE_LONG;
}
return new VarInt(value, originallyEncodedSize);
}
@ -132,11 +137,11 @@ public class VarInt {
*/
public static int sizeOf(long value) {
// if negative, it's actually a very large unsigned long value
if (value < 0) return 9; // 1 marker + 8 data bytes
if (value < 253) return 1; // 1 data byte
if (value <= 0xFFFFL) return 3; // 1 marker + 2 data bytes
if (value <= 0xFFFFFFFFL) return 5; // 1 marker + 4 data bytes
return 9; // 1 marker + 8 data bytes
if (value < 0) return SIZE_LONG;
if (value < 253) return SIZE_BYTE;
if (value <= 0xFFFFL) return SIZE_SHORT;
if (value <= 0xFFFFFFFFL) return SIZE_INT;
return SIZE_LONG;
}
/**