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Inline Base64#decode4to3 

Relates #16725
This commit is contained in:
Jason Tedor 2016-02-12 14:39:52 -05:00
parent a1740d6661
commit cf1d9cfefc
1 changed files with 23 additions and 54 deletions
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77
core/src/main/java/org/elasticsearch/common/Base64.java
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@ -942,17 +942,10 @@ public final class Base64 {
* or there is not enough room in the array.
* @since 1.3
*/
private static int decode4to3(
byte[] source, int srcOffset,
byte[] destination, int destOffset, int options) {
private static int decode4to3(byte[] source, int srcOffset, byte[] destination, int destOffset, int options) {
// Lots of error checking and exception throwing
if (source == null) {
throw new NullPointerException("Source array was null.");
} // end if
if (destination == null) {
throw new NullPointerException("Destination array was null.");
} // end if
Objects.requireNonNull(source, "Source array was null.");
Objects.requireNonNull(destination, "Destination array was null.");
if (srcOffset < 0 || srcOffset + 3 >= source.length) {
throw new IllegalArgumentException(String.format(Locale.ROOT,
"Source array with length %d cannot have offset of %d and still process four bytes.", source.length, srcOffset));
@ -962,56 +955,36 @@ public final class Base64 {
"Destination array with length %d cannot have offset of %d and still store three bytes.", destination.length, destOffset));
} // end if
byte[] DECODABET = getDecodabet(options);
// Two ways to do the same thing. Don't know which way I like best.
//int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
// | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );
int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
| ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12);
destination[destOffset] = (byte) (outBuff >>> 16);
// Example: Dk==
if (source[srcOffset + 2] == EQUALS_SIGN) {
// Two ways to do the same thing. Don't know which way I like best.
//int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
// | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );
int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
| ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12);
destination[destOffset] = (byte) (outBuff >>> 16);
return 1;
}
// Example: DkL=
else if (source[srcOffset + 3] == EQUALS_SIGN) {
// Two ways to do the same thing. Don't know which way I like best.
//int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
// | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
// | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 );
int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
| ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12)
| ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6);
outBuff |= ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6);
destination[destOffset + 1] = (byte) (outBuff >>> 8);
destination[destOffset] = (byte) (outBuff >>> 16);
destination[destOffset + 1] = (byte) (outBuff >>> 8);
// Example: DkL=
if (source[srcOffset + 3] == EQUALS_SIGN) {
return 2;
}
outBuff |= ((DECODABET[source[srcOffset + 3]] & 0xFF));
destination[destOffset + 2] = (byte) (outBuff);
// Example: DkLE
else {
// Two ways to do the same thing. Don't know which way I like best.
//int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
// | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
// | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 )
// | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 );
int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
| ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12)
| ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6)
| ((DECODABET[source[srcOffset + 3]] & 0xFF));
destination[destOffset] = (byte) (outBuff >> 16);
destination[destOffset + 1] = (byte) (outBuff >> 8);
destination[destOffset + 2] = (byte) (outBuff);
return 3;
}
} // end decodeToBytes
return 3;
}
/**
@ -1056,13 +1029,9 @@ public final class Base64 {
* @throws java.io.IOException If bogus characters exist in source data
* @since 1.3
*/
public static byte[] decode(byte[] source, int off, int len, int options)
throws java.io.IOException {
public static byte[] decode(byte[] source, int off, int len, int options) throws java.io.IOException {
// Lots of error checking and exception throwing
if (source == null) {
throw new NullPointerException("Cannot decode null source array.");
} // end if
Objects.requireNonNull(source, "Cannot decode null source array.");
if (off < 0 || off + len > source.length) {
throw new IllegalArgumentException(String.format(Locale.ROOT,
"Source array with length %d cannot have offset of %d and process %d bytes.", source.length, off, len));