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Minor reformattings on Base58.java

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This commit is contained in:
Mike Hearn 2013-02-05 16:15:07 +01:00
parent 5ce607f1ae
commit 0d0039cbdb
1 changed files with 13 additions and 28 deletions
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41
core/src/main/java/com/google/bitcoin/core/Base58.java
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@ -24,6 +24,9 @@ import java.util.Arrays;
* <p>Base58 is a way to encode Bitcoin addresses as numbers and letters. Note that this is not the same base58 as used by
* Flickr, which you may see reference to around the internet.</p>
*
* <p>You may instead wish to work with {@link VersionedChecksummedBytes}, which adds support for testing the prefix
* and suffix bytes commonly found in addresses.</p>
*
* <p>Satoshi says: why base-58 instead of standard base-64 encoding?<p>
*
* <ul>
@ -35,10 +38,7 @@ import java.util.Arrays;
* </ul>
*/
public class Base58 {
private static final char[] ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
.toCharArray();
private static final int BASE_58 = ALPHABET.length;
private static final int BASE_256 = 256;
public static final char[] ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz".toCharArray();
private static final int[] INDEXES = new int[128];
static {
@ -49,7 +49,8 @@ public class Base58 {
INDEXES[ALPHABET[i]] = i;
}
}
/** Encodes the given bytes in base58. No checksum is appended. */
public static String encode(byte[] input) {
if (input.length == 0) {
return "";
@ -94,11 +95,8 @@ public class Base58 {
if (input.length() == 0) {
return new byte[0];
}
byte[] input58 = new byte[input.length()];
//
// Transform the String to a base58 byte sequence
//
for (int i = 0; i < input.length(); ++i) {
char c = input.charAt(i);
@ -112,18 +110,12 @@ public class Base58 {
input58[i] = (byte) digit58;
}
//
// Count leading zeroes
//
int zeroCount = 0;
while (zeroCount < input58.length && input58[zeroCount] == 0) {
++zeroCount;
}
//
// The encoding
//
byte[] temp = new byte[input.length()];
int j = temp.length;
@ -136,10 +128,7 @@ public class Base58 {
temp[--j] = mod;
}
//
// Do no add extra leading zeroes, move j to first non null byte.
//
while (j < temp.length && temp[j] == 0) {
++j;
}
@ -148,10 +137,7 @@ public class Base58 {
}
public static BigInteger decodeToBigInteger(String input) throws AddressFormatException {
byte[] bytes = decode(input);
// always return a positive BigInteger
return new BigInteger(1, bytes);
return new BigInteger(1, decode(input));
}
/**
@ -182,11 +168,11 @@ public class Base58 {
int remainder = 0;
for (int i = startAt; i < number.length; i++) {
int digit256 = (int) number[i] & 0xFF;
int temp = remainder * BASE_256 + digit256;
int temp = remainder * 256 + digit256;
number[i] = (byte) (temp / BASE_58);
number[i] = (byte) (temp / 58);
remainder = temp % BASE_58;
remainder = temp % 58;
}
return (byte) remainder;
@ -199,11 +185,11 @@ public class Base58 {
int remainder = 0;
for (int i = startAt; i < number58.length; i++) {
int digit58 = (int) number58[i] & 0xFF;
int temp = remainder * BASE_58 + digit58;
int temp = remainder * 58 + digit58;
number58[i] = (byte) (temp / BASE_256);
number58[i] = (byte) (temp / 256);
remainder = temp % BASE_256;
remainder = temp % 256;
}
return (byte) remainder;
@ -215,5 +201,4 @@ public class Base58 {
return range;
}
}