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SwfFileLoader.java
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SwfFileLoader.java
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/*
* This file is part of ArakneLangLoader.
*
* ArakneLangLoader is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ArakneLangLoader 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with ArakneLangLoader. If not, see <https://www.gnu.org/licenses/>.
*
* Copyright (c) 2020 Vincent Quatrevieux
*/
package fr.arakne.swflangloader.loader;
import com.jpexs.decompiler.flash.AbortRetryIgnoreHandler;
import com.jpexs.decompiler.flash.SWF;
import com.jpexs.decompiler.flash.exporters.modes.ScriptExportMode;
import com.jpexs.decompiler.flash.exporters.settings.ScriptExportSettings;
import fr.arakne.swflangloader.parser.mapper.MapperHydrator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.net.URL;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Load the SWF file to extract AS3 sources
*/
final public class SwfFileLoader {
private final static Logger LOGGER = LoggerFactory.getLogger(SwfFileLoader.class);
final private Path tempDir;
final private boolean cache;
public SwfFileLoader() {
this(Paths.get("./tmp"), true);
}
/**
* @param tempDir The temporary directory used for extract action script files
* @param cache Enable cache (i.e. keep tmp files)
*/
public SwfFileLoader(Path tempDir, boolean cache) {
this.tempDir = tempDir;
this.cache = cache;
}
/**
* Load the SWF file and hydrate the target structure
*
* @param file SWF file URL
* @param target The target structure
* @param hydrator Hydrator to use
*
* @param <T> The structure type
*
* @throws IOException When error occurs during loading the SWF file
* @throws InterruptedException When the loading is cancelled
*/
public synchronized <T extends AbstractSwfFile> void load(URL file, T target, MapperHydrator<T> hydrator) throws IOException, InterruptedException {
LOGGER.debug("[SWF] Loading {} to {}", file, target.getClass().getSimpleName());
final String filename = extractFilename(file);
parseFilename(target, filename);
Path outdir = tempDir.resolve(filename);
Files.createDirectories(outdir);
try {
List<File> sources = loadFilesFromCache(outdir);
if (sources.isEmpty()) {
LOGGER.debug("[SWF] {} is not cached. Load from SWF", file);
sources = loadFilesFromSwf(file, outdir);
}
for (File source : sources) {
parseFile(source, target, hydrator);
}
} finally {
if (!cache) {
clearTemp(tempDir);
}
}
}
/**
* Clear the cache
*
* @throws IOException When removing cache files failed
*/
public void clear() throws IOException {
clearTemp(tempDir);
}
private String extractFilename(URL file) {
final String path = file.getFile();
final int filenamePos = path.lastIndexOf('/');
return path.substring(filenamePos + 1, path.length() - 4);
}
private void parseFilename(AbstractSwfFile target, String filename) {
final String[] parts = filename.split("_", 3);
if (parts.length != 3) {
return;
}
target.setName(parts[0]);
target.setLanguage(parts[1]);
try {
target.setVersion(Integer.parseInt(parts[2]));
} catch (NumberFormatException e) {
// Ignore
}
}
private List<File> loadFilesFromSwf(URL url, Path outdir) throws IOException, InterruptedException {
try (InputStream stream = url.openStream()) {
SWF swf = new SWF(stream, false);
return swf.exportActionScript(
new AbortRetryIgnoreHandler() {
@Override
public int handle(Throwable throwable) {
return AbortRetryIgnoreHandler.ABORT;
}
@Override
public AbortRetryIgnoreHandler getNewInstance() {
return this;
}
},
outdir.toAbsolutePath().toString(),
new ScriptExportSettings(ScriptExportMode.AS, false, true),
false,
null
);
}
}
private List<File> loadFilesFromCache(Path cacheDir) throws IOException {
if (!cache) {
return Collections.emptyList();
}
try (final Stream<Path> files = Files.walk(cacheDir)) {
return files
.filter(Files::isRegularFile)
.filter(path -> path.toString().endsWith(".as"))
.map(Path::toFile)
.collect(Collectors.toList())
;
}
}
/**
* Parse file lines
*/
private <T> void parseFile(File file, T target, MapperHydrator<T> hydrator) throws IOException {
try (BufferedReader reader = new BufferedReader(new InputStreamReader(Files.newInputStream(file.toPath())))) {
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
try {
hydrator.hydrate(target, line);
} catch (Exception e) {
LOGGER.error("[SWF] Error while parsing line: {}", line, e);
throw e;
}
}
}
}
/**
* Recursive clear cache directory
*/
private void clearTemp(Path tempdir) throws IOException {
if (!Files.exists(tempdir)) {
return;
}
Files.walkFileTree(tempdir, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
Files.delete(dir);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Files.delete(file);
return FileVisitResult.CONTINUE;
}
});
}
}