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Byte based encoding support library for java
/*
* 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 org.jcodings.transcode;
import static org.jcodings.transcode.EConv.NULL_STRING;
import static org.jcodings.util.CaseInsensitiveBytesHash.caseInsensitiveEquals;
import java.util.Arrays;
import java.util.Iterator;
import org.jcodings.ObjPtr;
import org.jcodings.exception.ErrorMessages;
import org.jcodings.exception.TranscoderException;
import org.jcodings.transcode.Transcoder.GenericTranscoderEntry;
import org.jcodings.util.CaseInsensitiveBytesHash;
import org.jcodings.util.Hash;
public class TranscoderDB implements EConvFlags {
public static final class Entry {
private String transcoderClass;
private final byte[] source, destination;
private Transcoder transcoder;
private Entry(byte[] source, byte[] destination) {
this.source = source;
this.destination = destination;
}
public byte[] getSource() {
return source;
}
public byte[] getDestination() {
return destination;
}
/* load_transcoder_entry */
public Transcoder getTranscoder() {
if (transcoder == null) {
if (transcoderClass != null) {
transcoder = Transcoder.load(transcoderClass);
} else {
GenericTranscoderEntry[] list = TranscoderList.GENERIC_LIST;
for (int i = 0; i < list.length; i++) {
GenericTranscoderEntry entry = list[i];
if (Arrays.equals(source, entry.source) && Arrays.equals(destination, entry.destination)) {
transcoder = entry.createTranscoder();
break;
}
}
}
}
return transcoder;
}
}
public static final CaseInsensitiveBytesHash> transcoders = new CaseInsensitiveBytesHash>();
/* make_transcoder_entry */
static Entry makeEntry(byte[] source, byte[] destination) {
CaseInsensitiveBytesHash sHash = transcoders.get(source);
if (sHash == null) {
sHash = new CaseInsensitiveBytesHash();
transcoders.putDirect(source, sHash);
}
Entry entry = sHash.get(destination);
if (entry == null) {
entry = new Entry(source, destination);
sHash.putDirect(destination, entry);
} else {
throw new TranscoderException(ErrorMessages.ERR_TRANSCODER_ALREADY_REGISTERED, new String(source + " to " + new String(destination)));
}
return entry;
}
/* get_transcoder_entry */
public static Entry getEntry(byte[] source, byte[] destination) {
CaseInsensitiveBytesHash sHash = transcoders.get(source);
return sHash == null ? null : sHash.get(destination);
}
/* rb_register_transcoder */
static void register(Transcoder transcoder) {
Entry entry = makeEntry(transcoder.source, transcoder.destination);
if (entry.transcoder != null)
throw new TranscoderException(ErrorMessages.ERR_TRANSCODER_ALREADY_REGISTERED, new String(transcoder.source + " to "
+ new String(transcoder.destination)));
entry.transcoder = transcoder;
}
/* declare_transcoder */
static void declare(String source, String destination, String transcoderClass) {
Entry entry = makeEntry(source.getBytes(), destination.getBytes());
entry.transcoderClass = transcoderClass;
}
static final class SearchPathQueue {
ObjPtr next = new ObjPtr();
byte[] encoding;
}
public interface SearchPathCallback {
void call(byte[] source, byte[] destination, int depth);
}
/* transcode_search_path */
public static int searchPath(byte[] source, byte[] destination, SearchPathCallback callback) {
if (caseInsensitiveEquals(source, destination)) return -1;
ObjPtr bfsQueue = new ObjPtr();
SearchPathQueue queue = new SearchPathQueue();
queue.encoding = source;
ObjPtr bfsLastQueue = queue.next;
bfsQueue.p = queue;
CaseInsensitiveBytesHash bfsVisited = new CaseInsensitiveBytesHash();
bfsVisited.put(source, NULL_STRING);
while (bfsQueue.p != null) {
queue = bfsQueue.p;
bfsQueue.p = queue.next.p;
if (bfsQueue.p == null) bfsLastQueue = bfsQueue;
CaseInsensitiveBytesHash table2 = transcoders.get(queue.encoding);
if (table2 == null) continue;
Entry entry = table2.get(destination);
if (entry != null) {
bfsVisited.put(destination, queue.encoding);
byte[] enc = destination;
int depth, pathLength = 0;
while (true) {
byte[] tmp = bfsVisited.get(enc);
if (tmp == NULL_STRING) break;
pathLength++;
enc = tmp;
}
depth = pathLength;
enc = destination;
while (true) {
byte[] tmp = bfsVisited.get(enc);
if (tmp == NULL_STRING) break;
callback.call(tmp, enc, --depth);
enc = tmp;
}
return pathLength;
} else {
byte[] bfsBaseEnc = queue.encoding;
for (Hash.HashEntry o : (Iterable>)table2.entryIterator()) {
CaseInsensitiveBytesHash.CaseInsensitiveBytesHashEntry e = (CaseInsensitiveBytesHash.CaseInsensitiveBytesHashEntry) o;
byte[] dname = e.bytes;
if (bfsVisited.get(dname) == null) {
SearchPathQueue q = new SearchPathQueue();
q.encoding = dname;
q.next.p = null;
bfsLastQueue.p = q;
bfsLastQueue = q.next;
bfsVisited.putDirect(dname, bfsBaseEnc);
}
}
bfsBaseEnc = null;
}
} // while
return -1;
}
/* rb_econv_alloc */
public static EConv alloc(int n) {
return new EConv(n);
}
/* rb_econv_open_by_transcoder_entries */
private static EConv openByTranscoderEntries(int n, Entry[] entries) {
EConv econv = new EConv(n);
for (int i = 0; i < n; i++) {
Transcoder transcoder = entries[i].getTranscoder();
econv.addTranscoderAt(transcoder, econv.numTranscoders);
}
return econv;
}
/* rb_econv_open0 */
private static EConv open0(byte[] source, byte[] destination, int ecflags) {
// final Encoding senc = EncodingDB.getEncodings().get(source).getEncoding();
// final Encoding denc = EncodingDB.getEncodings().get(destination).getEncoding();
final int numTrans;
final Entry[] entries;
if (source.length == 0 && destination.length == 0) {
numTrans = 0;
entries = null;
} else {
final ObjPtr lentries = new ObjPtr();
numTrans = searchPath(source, destination, new SearchPathCallback() {
int additional = 0;
public void call(byte[] source, byte[] destination, int depth) {
if (lentries.p == null) lentries.p = new Entry[depth + 1 + additional];
lentries.p[depth] = getEntry(source, destination);
}
});
entries = lentries.p;
if (numTrans < 0) {
return null;
}
}
EConv ec = openByTranscoderEntries(numTrans, entries);
if (ec == null) return null;
ec.flags = ecflags;
ec.source = source;
ec.destination = destination;
return ec;
}
/* decorator_names */
public static int decoratorNames(int ecflags, byte[][] decorators) {
switch (ecflags & NEWLINE_DECORATOR_MASK) {
case UNIVERSAL_NEWLINE_DECORATOR:
case CRLF_NEWLINE_DECORATOR:
case CR_NEWLINE_DECORATOR:
case 0:
break;
default:
return -1;
}
if (((ecflags & XML_TEXT_DECORATOR) != 0) && ((ecflags & XML_ATTR_CONTENT_DECORATOR) != 0)) return -1;
int numDecorators = 0;
if ((ecflags & XML_TEXT_DECORATOR) != 0) decorators[numDecorators++] = "xml_text_escape".getBytes();
if ((ecflags & XML_ATTR_CONTENT_DECORATOR) != 0) decorators[numDecorators++] = "xml_attr_content_escape".getBytes();
if ((ecflags & XML_ATTR_QUOTE_DECORATOR) != 0) decorators[numDecorators++] = "xml_attr_quote".getBytes();
if ((ecflags & CRLF_NEWLINE_DECORATOR) != 0) decorators[numDecorators++] = "crlf_newline".getBytes();
if ((ecflags & CR_NEWLINE_DECORATOR) != 0) decorators[numDecorators++] = "cr_newline".getBytes();
if ((ecflags & UNIVERSAL_NEWLINE_DECORATOR) != 0) decorators[numDecorators++] = "universal_newline".getBytes();
return numDecorators;
}
public static EConv open(String source, String destination, int ecflags) {
return open(source.getBytes(), destination.getBytes(), ecflags);
}
/* rb_econv_open */
public static EConv open(byte[] source, byte[] destination, int ecflags) {
byte[][] decorators = new byte[MAX_ECFLAGS_DECORATORS][];
int numDecorators = decoratorNames(ecflags, decorators);
if (numDecorators == -1) return null;
EConv ec = open0(source, destination, ecflags & ERROR_HANDLER_MASK);
if (ec == null) return null;
for (int i = 0; i < numDecorators; i++) {
if (!ec.decorateAtLast(decorators[i])) {
ec.close();
return null;
}
}
ec.flags |= ecflags & ~ERROR_HANDLER_MASK;
return ec;
}
/* rb_econv_asciicompat_encoding */// ?? to transcoderdb ?
static byte[] asciiCompatibleEncoding(byte[] asciiCompatName) {
CaseInsensitiveBytesHash dTable = TranscoderDB.transcoders.get(asciiCompatName);
if (dTable == null || dTable.size() != 1) return null;
byte[] asciiCN = null;
for (Entry e : dTable) {
if (!EConv.decorator(e.source, e.destination)) {
Transcoder transcoder = e.getTranscoder();
if (transcoder != null && transcoder.compatibility.isDecoder()) {
asciiCN = transcoder.destination;
break;
}
}
}
return asciiCN;
}
static {
TranscoderList.load();
}
}