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package org.rapidoidx.bytes;
/*
* #%L
* rapidoid-x-buffer
* %%
* Copyright (C) 2014 - 2015 Nikolche Mihajlovski and contributors
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see .
* #L%
*/
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.u.U;
import org.rapidoid.util.Constants;
import org.rapidoid.util.UTILS;
import org.rapidoid.wrap.LongWrap;
import org.rapidoidx.data.Range;
import org.rapidoidx.data.Ranges;
@Authors("Nikolche Mihajlovski")
@Since("3.0.0")
public class BytesUtil implements Constants {
public static final byte[] CHARS_SWITCH_CASE = new byte[128];
static {
for (int ch = 0; ch < 128; ch++) {
if (ch >= 'a' && ch <= 'z') {
CHARS_SWITCH_CASE[ch] = (byte) (ch - 32);
} else if (ch >= 'A' && ch <= 'Z') {
CHARS_SWITCH_CASE[ch] = (byte) (ch + 32);
} else {
CHARS_SWITCH_CASE[ch] = (byte) ch;
}
}
}
public static Bytes from(byte[] bytes) {
return new ByteArrayBytes(bytes);
}
public static Bytes from(String s) {
return new StringBytes(s);
}
public static long parseLines(Bytes bytes, Ranges lines, LongWrap res, long start, long limit, byte end1, byte end2) {
byte b0 = 0, b1 = 0, b2 = 0, b3 = 0;
long ret = -1;
res.value = NOT_FOUND;
long i;
long from = start;
for (i = start; i < limit; i++) {
b0 = b1;
b1 = b2;
b2 = b3;
b3 = bytes.get(i);
if (b3 == LF) {
long len;
if (b2 == CR) {
len = i - from - 1;
if (b0 == end1 && b1 == end2 && len > 0) {
res.value = lines.count;
}
} else {
len = i - from;
if (b1 == end1 && b2 == end2 && len > 0) {
res.value = lines.count;
}
}
if (len == 0) {
ret = i + 1;
break;
}
lines.add(from, len);
from = i + 1;
}
}
return ret;
}
public static long parseLines(Bytes bytes, Ranges lines, long start, long limit) {
byte b0 = 0, b1 = 0;
long ret = -1;
long i;
long from = start;
for (i = start; i < limit; i++) {
b0 = b1;
b1 = bytes.get(i);
if (b1 == LF) {
long len;
if (b0 == CR) {
len = i - from - 1;
} else {
len = i - from;
}
if (len == 0) {
ret = i + 1;
break;
}
lines.add(from, len);
from = i + 1;
}
}
return ret;
}
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;
}
public static Range getByPrefix(Bytes bytes, Ranges ranges, byte[] prefix, boolean caseSensitive) {
for (int i = 0; i < ranges.count; i++) {
if (startsWith(bytes, ranges.ranges[i], prefix, caseSensitive)) {
return ranges.ranges[i];
}
}
return null;
}
public static String get(Bytes bytes, Range range) {
return new String(getBytes(bytes, range));
}
public static byte[] getBytes(Bytes bytes, Range range) {
byte[] byteArr = new byte[(int) range.length];
for (int i = 0; i < byteArr.length; i++) {
byteArr[i] = bytes.get(range.start + i);
}
return byteArr;
}
public static long scan(Bytes bytes, long from, long to, byte value) {
for (long i = from; i <= to; i++) {
if (bytes.get(i) == value) {
return i;
}
}
return -1;
}
public static long scanNoCase(Bytes bytes, long from, long to, byte value) {
for (long i = from; i <= to; i++) {
byte b = bytes.get(i);
if (b == value || (b >= 'A' && CHARS_SWITCH_CASE[b] == value)) {
return i;
}
}
return -1;
}
public static boolean match(Bytes bytes, long start, byte[] match, int offset, int length, boolean caseSensitive) {
boolean result;
if (caseSensitive) {
result = matchSensitive(bytes, start, match, offset, length);
} else {
result = matchNoCase(bytes, start, match, offset, length);
}
return result;
}
public static boolean matchNoCase(Bytes bytes, long start, byte[] match, int offset, int length) {
for (int i = 0; i < length; i++) {
byte b = bytes.get(start + i);
if (b != match[offset + i] && (b < 'A' || CHARS_SWITCH_CASE[b] != match[offset + i])) {
return false;
}
}
return true;
}
public static boolean matchSensitive(Bytes bytes, long start, byte[] match, int offset, int length) {
for (int i = 0; i < length; i++) {
if (bytes.get(start + i) != match[offset + i]) {
return false;
}
}
return true;
}
public static boolean match(Bytes bytes, long start, byte[] match, boolean caseSensitive) {
return match(bytes, start, match, 0, match.length, caseSensitive);
}
public static long find(Bytes bytes, long start, long limit, byte match, boolean caseSensitive) {
assert start >= 0;
assert limit >= 0;
if (limit - start < 1) {
return -1;
}
if (caseSensitive) {
return scan(bytes, start, limit - 1, match);
} else {
return scanNoCase(bytes, start, limit - 1, match);
}
}
public static long find(Bytes bytes, long start, long limit, byte[] match, boolean caseSensitive) {
return find(bytes, start, limit, match, 0, match.length, caseSensitive);
}
public static long find(Bytes bytes, long start, long limit, byte[] match, int offset, int length,
boolean caseSensitive) {
assert start >= 0;
assert limit >= 0;
assert offset >= 0;
assert length >= 0;
long result;
if (caseSensitive) {
result = findSensitive(bytes, start, limit, match, offset, length);
} else {
result = findNoCase(bytes, start, limit, match, offset, length);
}
return result;
}
private static long findNoCase(Bytes bytes, long start, long limit, byte[] match, long offset, long length) {
throw U.notReady();
}
private static long findSensitive(Bytes bytes, long start, long limit, byte[] match, int offset, int length) {
if (limit - start < length) {
return -1;
}
long pos = start;
long last = limit - length;
while ((pos = scan(bytes, pos, last, match[0])) >= 0) {
if (matchSensitive(bytes, pos, match, offset, length)) {
return pos;
}
pos++;
}
return -1;
}
public static boolean matches(Bytes bytes, Range target, byte[] match, boolean caseSensitive) {
if (target.length != match.length || target.start < 0 || target.last() >= bytes.limit()) {
return false;
}
boolean result = match(bytes, target.start, match, caseSensitive);
return result;
}
public static boolean startsWith(Bytes bytes, Range target, byte[] match, boolean caseSensitive) {
if (target.length < match.length || target.start < 0 || target.last() >= bytes.limit()) {
return false;
}
boolean result = match(bytes, target.start, match, caseSensitive);
return result;
}
public static boolean containsAt(Bytes bytes, Range target, long offset, byte[] match, boolean caseSensitive) {
if (offset < 0 || target.length < offset + match.length || target.start < 0 || target.last() >= bytes.limit()) {
return false;
}
boolean result = match(bytes, target.start + offset, match, caseSensitive);
return result;
}
public static void trim(Bytes bytes, Range target) {
long start = target.start;
long len = target.length;
long finish = start + len - 1;
if (start < 0 || len == 0) {
return;
}
while (start < finish && bytes.get(start) == ' ') {
start++;
}
while (start < finish && bytes.get(finish) == ' ') {
finish--;
}
target.start = start;
target.length = finish - start + 1;
}
public static boolean split(Bytes bytes, Range target, byte sep, Range before, Range after, boolean trimParts) {
long pos = find(bytes, target.start, target.limit(), sep, true);
if (pos >= 0) {
before.setInterval(target.start, pos);
after.setInterval(pos + 1, target.limit());
if (trimParts) {
trim(bytes, before);
trim(bytes, after);
}
return true;
} else {
before.assign(target);
after.reset();
if (trimParts) {
trim(bytes, before);
}
return false;
}
}
/**
* Scans the buffer until the specified separator is found, and matches the 4-byte prefix of the scanned selection
* against the specified search prefix. Returns the position of the separator, or -1 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 scanUntilAndMatchPrefix(Bytes bytes, Range result, byte separator, long fromPos, long toPos,
long searchPrefix) {
byte b0, b1, b2, b3;
long p = fromPos;
if (p <= toPos) {
b0 = bytes.get(p);
if (b0 == separator) {
result.set(fromPos, 0);
return p + 1;
}
} else {
result.reset();
return NOT_FOUND;
}
p++;
if (p <= toPos) {
b1 = bytes.get(p);
if (b1 == separator) {
result.set(fromPos, 1);
return p + 1;
}
} else {
result.reset();
return NOT_FOUND;
}
p++;
if (p <= toPos) {
b2 = bytes.get(p);
if (b2 == separator) {
result.set(fromPos, 2);
return p + 1;
}
} else {
result.reset();
return NOT_FOUND;
}
p++;
if (p <= toPos) {
b3 = bytes.get(p);
if (b3 == separator) {
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) == separator) {
result.setInterval(fromPos, i);
long nextPos = i + 1;
return matchedPrefix ? -nextPos : nextPos;
}
}
result.reset();
return NOT_FOUND;
}
/**
* 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 -1 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;
}
}
