net.snowflake.ingest.streaming.internal.BinaryStringUtils Maven / Gradle / Ivy
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package net.snowflake.ingest.streaming.internal;
import java.nio.ByteBuffer;
import org.apache.commons.codec.binary.Hex;
public class BinaryStringUtils {
private static final int MAX_LOB_LEN = 32;
/** Returns the number of unicode code points in a string */
static int unicodeCharactersCount(String s) {
return s.codePointCount(0, s.length());
}
/**
* Truncate an array of bytes to 32 bytes and optionally increment the last byte(s). More the one
* byte can be incremented in case it overflows.
*/
static String truncateBytesAsHex(byte[] bytes, boolean truncateUp) {
if (bytes.length <= MAX_LOB_LEN) {
return Hex.encodeHexString(bytes);
}
// In order not to mutate the original byte array, let's make a copy
byte[] result = new byte[MAX_LOB_LEN];
System.arraycopy(bytes, 0, result, 0, MAX_LOB_LEN);
// Round the least significant byte(s) up
if (truncateUp) {
int idx;
for (idx = MAX_LOB_LEN - 1; idx >= 0; idx--) {
// increment the current byte, if there was no overflow, we can stop
if (++result[idx] != 0) {
break;
}
}
// Whole prefix has overflown, return infinity
if (idx == -1) {
return "Z";
}
}
return Hex.encodeHexString(ByteBuffer.wrap(result, 0, MAX_LOB_LEN));
}
}