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BigInteger.java (randBytes): New method.

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2001-08-17  Mark J Roberts  <mjr@anarcast.net>

	* java/math/BigInteger.java (randBytes): New method.
	(BigInteger(int,Random)): Use randBytes.

From-SVN: r44984
This commit is contained in:
Mark J Roberts 2001-08-17 22:21:02 +00:00 committed by Tom Tromey
parent 2d76cb1aba
commit 62ee966e9c
2 changed files with 16 additions and 12 deletions
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5
libjava/ChangeLog
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@ -1,3 +1,8 @@
2001-08-17 Mark J Roberts <mjr@anarcast.net>
* java/math/BigInteger.java (randBytes): New method.
(BigInteger(int,Random)): Use randBytes.
2001-08-17 Tom Tromey <tromey@redhat.com>
* gnu/gcj/convert/IOConverter.java: Add `646' alias.

23
libjava/java/math/BigInteger.java
View File

@ -143,22 +143,21 @@ public class BigInteger extends Number implements Comparable
}
public BigInteger(int numBits, Random rnd)
{
this(1, randBytes(numBits, rnd));
}
private static byte[] randBytes(int numBits, Random rnd)
{
if (numBits < 0)
throw new IllegalArgumentException();
// Result is always positive so tack on an extra zero word, it will be
// canonicalized out later if necessary.
int nwords = numBits / 32 + 2;
words = new int[nwords];
words[--nwords] = 0;
words[--nwords] = rnd.nextInt() >>> (numBits % 32);
while (--nwords >= 0)
words[nwords] = rnd.nextInt();
BigInteger result = make(words, words.length);
this.ival = result.ival;
this.words = result.words;
int extra = numBits % 8;
byte[] b = new byte[numBits / 8 + (extra > 0 ? 1 : 0)];
rnd.nextBytes(b);
if (extra > 0)
b[0] &= ~((~0) << (8 - extra));
return b;
}
public BigInteger(int bitLength, int certainty, Random rnd)