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Count 7 bits at a time.

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This commit is contained in:
akwizgran
2018-12-13 10:58:19 +00:00
parent c2f96580b8
commit 56c1fef4db
1 changed files with 2 additions and 12 deletions
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14
bramble-api/src/main/java/org/briarproject/bramble/util/ByteUtils.java
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@@ -68,16 +68,6 @@ public class ByteUtils {
dest[offset + 7] = (byte) (src & 0xFF); dest[offset + 7] = (byte) (src & 0xFF);
} }
private static int countSignificantBits(long src) {
if (src < 0) throw new IllegalArgumentException();
int bits = 0;
while (src > 0) {
src >>= 1;
bits++;
}
return bits;
}
/** /**
* Returns the number of bytes needed to represent 'src' as a * Returns the number of bytes needed to represent 'src' as a
* variable-length integer. * variable-length integer.
@@ -86,8 +76,8 @@ public class ByteUtils {
*/ */
public static int getVarIntBytes(long src) { public static int getVarIntBytes(long src) {
if (src < 0) throw new IllegalArgumentException(); if (src < 0) throw new IllegalArgumentException();
int len = Math.max(1, (countSignificantBits(src) + 6) / 7); int len = 1;
if (len > MAX_VARINT_BYTES) throw new AssertionError(); while ((src >>= 7) > 0) len++;
return len; return len;
} }