1 package net.sf.openrocket.file;
3 import java.io.BufferedInputStream;
4 import java.io.IOException;
5 import java.io.InputStream;
6 import java.nio.charset.Charset;
7 import java.util.Arrays;
8 import java.util.zip.GZIPInputStream;
9 import java.util.zip.ZipEntry;
10 import java.util.zip.ZipInputStream;
12 import net.sf.openrocket.document.OpenRocketDocument;
13 import net.sf.openrocket.file.openrocket.importt.OpenRocketLoader;
14 import net.sf.openrocket.file.rocksim.importt.RocksimLoader;
18 * A rocket loader that auto-detects the document type and uses the appropriate
19 * loading. Supports loading of GZIPed files as well with transparent
22 * @author Sampo Niskanen <sampo.niskanen@iki.fi>
24 public class GeneralRocketLoader extends AbstractRocketLoader {
26 private static final int READ_BYTES = 300;
28 private static final byte[] GZIP_SIGNATURE = { 31, -117 }; // 0x1f, 0x8b
29 private static final byte[] ZIP_SIGNATURE = "PK".getBytes(Charset.forName("US-ASCII"));
30 private static final byte[] OPENROCKET_SIGNATURE = "<openrocket".getBytes(Charset.forName("US-ASCII"));
31 private static final byte[] ROCKSIM_SIGNATURE = "<RockSimDoc".getBytes(Charset.forName("US-ASCII"));
33 private final OpenRocketLoader openRocketLoader = new OpenRocketLoader();
35 private final RocksimLoader rocksimLoader = new RocksimLoader();
38 protected OpenRocketDocument loadFromStream(InputStream source) throws IOException,
41 // Check for mark() support
42 if (!source.markSupported()) {
43 source = new BufferedInputStream(source);
47 byte[] buffer = new byte[READ_BYTES];
49 source.mark(READ_BYTES + 10);
50 count = source.read(buffer);
54 throw new RocketLoadException("Unsupported or corrupt file.");
57 // Detect the appropriate loader
60 if (buffer[0] == GZIP_SIGNATURE[0] && buffer[1] == GZIP_SIGNATURE[1]) {
61 OpenRocketDocument doc = loadFromStream(new GZIPInputStream(source));
62 doc.getDefaultStorageOptions().setCompressionEnabled(true);
66 // Check for ZIP (for future compatibility)
67 if (buffer[0] == ZIP_SIGNATURE[0] && buffer[1] == ZIP_SIGNATURE[1]) {
68 // Search for entry with name *.ork
69 ZipInputStream in = new ZipInputStream(source);
71 ZipEntry entry = in.getNextEntry();
73 throw new RocketLoadException("Unsupported or corrupt file.");
75 if (entry.getName().matches(".*\\.[oO][rR][kK]$")) {
76 OpenRocketDocument doc = loadFromStream(in);
77 doc.getDefaultStorageOptions().setCompressionEnabled(true);
83 // Check for OpenRocket
85 for (int i = 0; i < count; i++) {
86 if (buffer[i] == OPENROCKET_SIGNATURE[match]) {
88 if (match == OPENROCKET_SIGNATURE.length) {
89 return loadUsing(source, openRocketLoader);
96 byte[] typeIdentifier = Arrays.copyOf(buffer, ROCKSIM_SIGNATURE.length);
97 if (Arrays.equals(ROCKSIM_SIGNATURE, typeIdentifier)) {
98 return loadUsing(source, rocksimLoader);
100 throw new RocketLoadException("Unsupported or corrupt file.");
103 private OpenRocketDocument loadUsing(InputStream source, RocketLoader loader)
104 throws RocketLoadException {
106 OpenRocketDocument doc = loader.load(source);
107 warnings.addAll(loader.getWarnings());