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Tentative fix for #24

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Blue (Lukas Rieger) 2020-03-27 15:41:09 +01:00
parent 85f5d8947b
commit de7b0cba02
1 changed files with 45 additions and 28 deletions
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73
BlueMapCore/src/main/java/de/bluecolored/bluemap/core/mca/MCAWorld.java
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@ -218,40 +218,57 @@ private Chunk loadChunk(Vector2i chunkPos) throws IOException {
Vector2i regionPos = chunkToRegion(chunkPos);
Path regionPath = getMCAFilePath(regionPos);
try (RandomAccessFile raf = new RandomAccessFile(regionPath.toFile(), "r")) {
Throwable exception = null;
int xzChunk = Math.floorMod(chunkPos.getY(), 32) * 32 + Math.floorMod(chunkPos.getX(), 32);
for (int tries = 1; tries <= 5; tries++) {
if (tries > 1) {
try {
Thread.sleep(200);
} catch (InterruptedException interrupt) {
throw new IOException("Interrupted while waiting for the " + tries + "th try to load a chunk..");
}
}
raf.seek(xzChunk * 4);
int offset = raf.read() << 16;
offset |= (raf.read() & 0xFF) << 8;
offset |= raf.read() & 0xFF;
offset *= 4096;
try (RandomAccessFile raf = new RandomAccessFile(regionPath.toFile(), "r")) {
int size = raf.readByte() * 4096;
if (size == 0) {
int xzChunk = Math.floorMod(chunkPos.getY(), 32) * 32 + Math.floorMod(chunkPos.getX(), 32);
raf.seek(xzChunk * 4);
int offset = raf.read() << 16;
offset |= (raf.read() & 0xFF) << 8;
offset |= raf.read() & 0xFF;
offset *= 4096;
int size = raf.readByte() * 4096;
if (size == 0) {
return Chunk.empty(this, chunkPos);
}
raf.seek(offset + 4); // +4 skip chunk size
byte compressionTypeByte = raf.readByte();
CompressionType compressionType = CompressionType.getFromID(compressionTypeByte);
if (compressionType == null) {
throw new IOException("invalid compression type " + compressionTypeByte);
}
DataInputStream dis = new DataInputStream(new BufferedInputStream(compressionType.decompress(new FileInputStream(raf.getFD()))));
Tag<?> tag = Tag.deserialize(dis, Tag.DEFAULT_MAX_DEPTH);
if (tag instanceof CompoundTag) {
return Chunk.create(this, (CompoundTag) tag);
} else {
throw new IOException("invalid data tag: " + (tag == null ? "null" : tag.getClass().getName()));
}
} catch (FileNotFoundException ex) {
return Chunk.empty(this, chunkPos);
} catch (Throwable ex) {
exception = ex;
}
raf.seek(offset + 4); // +4 skip chunk size
byte compressionTypeByte = raf.readByte();
CompressionType compressionType = CompressionType.getFromID(compressionTypeByte);
if (compressionType == null) {
throw new IOException("invalid compression type " + compressionTypeByte);
}
DataInputStream dis = new DataInputStream(new BufferedInputStream(compressionType.decompress(new FileInputStream(raf.getFD()))));
Tag<?> tag = Tag.deserialize(dis, Tag.DEFAULT_MAX_DEPTH);
if (tag instanceof CompoundTag) {
return Chunk.create(this, (CompoundTag) tag);
} else {
throw new IOException("invalid data tag: " + (tag == null ? "null" : tag.getClass().getName()));
}
} catch (FileNotFoundException ex) {
return Chunk.empty(this, chunkPos);
}
if (exception == null) throw new IOException("Failed to load chunk after multiple attempts!");
throw new IOException("Failed to load chunk after multiple attempts!", exception);
}
@Override