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Inline Base64#decode 

Relates #16725
This commit is contained in:
Jason Tedor 2016-02-12 18:45:10 -05:00
parent cf1d9cfefc
commit 2690f69d77
1 changed files with 16 additions and 14 deletions
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30
core/src/main/java/org/elasticsearch/common/Base64.java
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@ -1048,16 +1048,21 @@ public final class Base64 {
int len34 = len * 3 / 4; // Estimate on array size
byte[] outBuff = new byte[len34]; // Upper limit on size of output
int outBuffPosn = 0; // Keep track of where we're writing
int outBuffPosn = decode(source, off, len, options, DECODABET, outBuff);
byte[] out = new byte[outBuffPosn];
System.arraycopy(outBuff, 0, out, 0, outBuffPosn);
return out;
} // end decode
private static int decode(byte[] source, int off, int len, int options, byte[] DECODABET, byte[] outBuff) throws IOException {
int outBuffPosn = 0; // Keep track of where we're writing
byte[] b4 = new byte[4]; // Four byte buffer from source, eliminating white space
int b4Posn = 0; // Keep track of four byte input buffer
int i = 0; // Source array counter
byte sbiDecode = 0; // Special value from DECODABET
for (int i = off; i < off + len; i++) { // Loop through source
for (i = off; i < off + len; i++) { // Loop through source
sbiDecode = DECODABET[source[i] & 0xFF];
byte sbiDecode = DECODABET[source[i] & 0xFF];
// White space, Equals sign, or legit Base64 character
// Note the values such as -5 and -9 in the
@ -1073,7 +1078,7 @@ public final class Base64 {
if (source[i] == EQUALS_SIGN) {
// check if the equals sign is somewhere in between
if (i+1 < len + off) {
throw new java.io.IOException(String.format(Locale.ROOT,
throw new IOException(String.format(Locale.ROOT,
"Found equals sign at position %d of the base64 string, not at the end", i));
}
break;
@ -1081,7 +1086,7 @@ public final class Base64 {
} // end if: quartet built
else {
if (source[i] == EQUALS_SIGN && len + off > i && source[i+1] != EQUALS_SIGN) {
throw new java.io.IOException(String.format(Locale.ROOT,
throw new IOException(String.format(Locale.ROOT,
"Found equals sign at position %d of the base64 string, not at the end", i));
} // enf if: equals sign and next character not as well
} // end else:
@ -1089,15 +1094,12 @@ public final class Base64 {
} // end if: white space, equals sign or better
else {
// There's a bad input character in the Base64 stream.
throw new java.io.IOException(String.format(Locale.ROOT,
throw new IOException(String.format(Locale.ROOT,
"Bad Base64 input character decimal %d in array position %d", ((int) source[i]) & 0xFF, i));
} // end else:
} // each input character
byte[] out = new byte[outBuffPosn];
System.arraycopy(outBuff, 0, out, 0, outBuffPosn);
return out;
} // end decode
return outBuffPosn;
}
/**