public static long parseLine(Bytes bytes, Range line, long start, long limit) {
byte b0 = 0, b1 = 0;
long ret = -1;
long i;
for (i = start; i < limit; i++) {
b0 = b1;
b1 = bytes.get(i);
if (b1 == LF) {
long len;
if (b0 == CR) {
len = i - start - 1;
} else {
len = i - start;
}
line.set(start, len);
ret = i + 1;
break;
}
}
return ret;
}
/**
* Scans the buffer until a line separator (CRLF or LF) is found, and matches the 4-byte prefix of
* the scanned selection against the specified search prefix. Returns the position of the
* separator, or <code>-1</code> if the limit is reached and separator not found. If the prefix is
* matched, the negative of the position is returned, to mark the prefix match. Duplicated code
* for performance reasons.
*/
public static long scanLnAndMatchPrefix(
Bytes bytes, Range result, long fromPos, long toPos, long searchPrefix) {
byte b0, b1, b2, b3;
long p = fromPos;
if (p <= toPos) {
b0 = bytes.get(p);
if (b0 == LF) {
result.set(fromPos, 0);
return p + 1;
}
} else {
result.reset();
return NOT_FOUND;
}
p++;
if (p <= toPos) {
b1 = bytes.get(p);
if (b1 == LF) {
if (b0 == CR) {
result.set(fromPos, 0);
} else {
result.set(fromPos, 1);
}
return p + 1;
}
} else {
result.reset();
return NOT_FOUND;
}
p++;
if (p <= toPos) {
b2 = bytes.get(p);
if (b2 == LF) {
if (b1 == CR) {
result.set(fromPos, 1);
} else {
result.set(fromPos, 2);
}
return p + 1;
}
} else {
result.reset();
return NOT_FOUND;
}
p++;
if (p <= toPos) {
b3 = bytes.get(p);
if (b3 == LF) {
if (b2 == CR) {
result.set(fromPos, 2);
} else {
result.set(fromPos, 3);
}
return p + 1;
}
} else {
result.reset();
return NOT_FOUND;
}
long prefix = UTILS.intFrom(b0, b1, b2, b3);
boolean matchedPrefix = prefix == searchPrefix;
for (long i = p; i <= toPos; i++) {
if (bytes.get(i) == LF) {
if (bytes.get(i - 1) == CR) {
result.setInterval(fromPos, i - 1);
} else {
result.setInterval(fromPos, i);
}
long nextPos = i + 1;
return matchedPrefix ? -nextPos : nextPos;
}
}
result.reset();
return NOT_FOUND;
}