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Java port of Oniguruma: http://www.geocities.jp/kosako3/oniguruma
that uses byte arrays directly instead of java Strings and chars
/*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package io.airlift.jcodings;
import io.airlift.jcodings.exception.ErrorMessages;
import io.airlift.jcodings.exception.InternalException;
import io.airlift.jcodings.specific.ASCIIEncoding;
import io.airlift.jcodings.util.CaseInsensitiveBytesHash;
public class EncodingDB {
public static final class Entry {
private static int count;
private final Entry base;
private Encoding encoding;
private final String encodingClass;
private final int index;
private final boolean isDummy;
private final byte[]name;
private Entry (byte[]name, String encodingClass, Entry base, boolean isDummy) {
this.name = name;
this.encodingClass = encodingClass;
this.base = base;
this.isDummy = isDummy;
index = count++;
}
// declare
Entry(String encodingClass) {
this(null, encodingClass, null, false);
}
// replicate
Entry(byte[]name, Entry base) {
this(name, base.encodingClass, base, false);
}
// dummy
Entry(byte[]name) {
this(name, ascii.encodingClass, ascii, true);
}
// dummy with base
Entry(byte[]name, Entry base, boolean dummy) {
this(name, base.encodingClass, base, dummy);
}
@Override
public int hashCode() {
return encodingClass.hashCode();
}
public Entry getBase() {
return base;
}
public Encoding getEncoding() {
if (encoding == null) {
if (name == null) {
encoding = Encoding.load(encodingClass);
} else {
if (isDummy) {
encoding = Encoding.loadForDummy(encodingClass).replicate(name, isDummy);
} else {
encoding = Encoding.load(encodingClass).replicate(name);
}
}
}
return encoding;
}
public String getEncodingClass() {
return encodingClass;
}
public int getIndex() {
return index;
}
public boolean isDummy() {
return isDummy;
}
}
private static String[] builtin = {
"ASCII-8BIT", "ASCII",
"Big5", "BIG5",
"Big5-HKSCS", "Big5HKSCS",
"Big5-UAO", "Big5UAO",
"CP949", "CP949",
"Emacs-Mule", "EmacsMule",
"EUC-JP", "EUCJP",
"EUC-KR", "EUCKR",
"EUC-TW", "EUCTW",
"GB18030", "GB18030",
"GBK", "GBK",
"ISO-8859-1", "ISO8859_1",
"ISO-8859-2", "ISO8859_2",
"ISO-8859-3", "ISO8859_3",
"ISO-8859-4", "ISO8859_4",
"ISO-8859-5", "ISO8859_5",
"ISO-8859-6", "ISO8859_6",
"ISO-8859-7", "ISO8859_7",
"ISO-8859-8", "ISO8859_8",
"ISO-8859-9", "ISO8859_9",
"ISO-8859-10", "ISO8859_10",
"ISO-8859-11", "ISO8859_11",
// "ISO-8859-12", "ISO8859_12",
"ISO-8859-13", "ISO8859_13",
"ISO-8859-14", "ISO8859_14",
"ISO-8859-15", "ISO8859_15",
"ISO-8859-16", "ISO8859_16",
"KOI8-R", "KOI8R",
"KOI8-U", "KOI8U",
"Shift_JIS", "SJIS",
"US-ASCII", "USASCII",
"UTF-8", "UTF8",
"UTF-16BE", "UTF16BE",
"UTF-16LE", "UTF16LE",
"UTF-32BE", "UTF32BE",
"UTF-32LE", "UTF32LE",
"Windows-1251", "CP1251",
"GB2312", "GB2312",
"Windows-31J", "Windows_31J" // TODO: Windows-31J is actually a variant of SJIS
};
static Entry ascii;
static final CaseInsensitiveBytesHash encodings = new CaseInsensitiveBytesHash(builtin.length);
static final CaseInsensitiveBytesHash aliases = new CaseInsensitiveBytesHash(builtin.length);
public static final CaseInsensitiveBytesHash getEncodings() {
return encodings;
}
public static final CaseInsensitiveBytesHash getAliases() {
return aliases;
}
public static void declare(String name, String encodingClass) {
byte[]bytes = name.getBytes();
if (encodings.get(bytes) != null) throw new InternalException(ErrorMessages.ERR_ENCODING_ALREADY_REGISTERED, name);
encodings.putDirect(bytes, new Entry(encodingClass));
}
public static void alias(String alias, String original) {
byte[]origBytes = original.getBytes();
Entry originalEntry = encodings.get(origBytes);
if (originalEntry == null) throw new InternalException(ErrorMessages.ERR_NO_SUCH_ENCODNG, original);
byte[]aliasBytes = alias.getBytes();
if (aliases.get(aliasBytes) != null) throw new InternalException(ErrorMessages.ERR_ENCODING_ALIAS_ALREADY_REGISTERED, alias);
aliases.putDirect(aliasBytes, originalEntry);
}
public static void replicate(String replica, String original) {
byte[]origBytes = original.getBytes();
Entry originalEntry = encodings.get(origBytes);
if (originalEntry == null) throw new InternalException(ErrorMessages.ERR_NO_SUCH_ENCODNG, original);
finishReplica(replica, originalEntry.isDummy, originalEntry);
}
private static void replicate(String replica, String original, boolean dummy) {
byte[]origBytes = original.getBytes();
Entry originalEntry = encodings.get(origBytes);
if (originalEntry == null) throw new InternalException(ErrorMessages.ERR_NO_SUCH_ENCODNG, original);
finishReplica(replica, dummy, originalEntry);
}
private static void finishReplica(String replica, boolean dummy, Entry originalEntry) {
byte[]replicaBytes = replica.getBytes();
if (encodings.get(replicaBytes) != null) throw new InternalException(ErrorMessages.ERR_ENCODING_REPLICA_ALREADY_REGISTERED, replica);
encodings.putDirect(replicaBytes, new Entry(replicaBytes, originalEntry, dummy));
}
public static void set_base(String name, String original) {
}
public static Entry dummy(byte[] bytes) {
if (encodings.get(bytes) != null) throw new InternalException(ErrorMessages.ERR_ENCODING_ALREADY_REGISTERED, new String(bytes));
Entry entry = new Entry(bytes);
encodings.putDirect(bytes, entry);
return entry;
}
public static void dummy(String name) {
dummy(name.getBytes());
}
public static void dummyUnicode(String replica) {
replicate(replica, replica + "BE", true);
}
static {
for (int i = 0; i < builtin.length / 2; i++) {
declare(builtin[i << 1], builtin[(i << 1) + 1]);
}
builtin = null;
ascii = encodings.get("ASCII-8BIT".getBytes());
String[][]encList = EncodingList.LIST;
for (int i = 0; i < encList.length; i++) {
String[]enc = encList[i];
switch (enc[0].charAt(0)) {
case 'R':
replicate(enc[1], enc[2]);
break;
case 'A':
alias(enc[1], enc[2]);
break;
case 'S':
set_base(enc[1], enc[2]);
break;
case 'D':
dummy(enc[1]);
break;
case 'U': // ENC_DUMMY_UNICODE from encdb.c
dummyUnicode(enc[1]);
break;
default:
Thread.dumpStack();
throw new InternalException("Unknown flag: " + enc[0].charAt(0));
}
}
}
}
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