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package eu.mulk.jgvariant.ostree;
import eu.mulk.jgvariant.core.Decoder;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.List;
/**
* An entry in a {@link DeltaSuperblock}.
*
* <p>Reference: {@code ostree-repo-static-delta-private.h#OSTREE_STATIC_DELTA_META_ENTRY_FORMAT}
*
* @param version the version corresponding to the version of {@link DeltaPartPayload}; always 0.
* @param checksum the checksum of the {@link DeltaPartPayload}.
* @param compressedSize the total compressed size of the delta.
* @param uncompressedSize the total uncompressed size of the files generated by the delta.
* @param objects a list of objects generated by the delta payload.
*/
public record DeltaMetaEntry(
int version,
Checksum checksum,
long compressedSize,
long uncompressedSize,
List<DeltaObject> objects) {
/**
* A reference to an object generated by a {@link DeltaPartPayload}.
*
* @param objectType the file type.
* @param checksum the checksum of the resulting file.
*/
public record DeltaObject(ObjectType objectType, Checksum checksum) {
private static final Decoder<DeltaObject> DECODER =
Decoder.ofStructure(
DeltaObject.class, Decoder.ofByte().map(ObjectType::valueOf), Checksum.decoder());
/**
* Acquires a {@link Decoder} for the enclosing type.
*
* @return a possibly shared {@link Decoder}.
*/
public static Decoder<DeltaObject> decoder() {
return DECODER;
}
}
private static final Decoder<DeltaMetaEntry> DECODER =
Decoder.ofStructure(
DeltaMetaEntry.class,
Decoder.ofInt().withByteOrder(ByteOrder.LITTLE_ENDIAN), // FIXME: non-canonical
Checksum.decoder(),
Decoder.ofLong().withByteOrder(ByteOrder.LITTLE_ENDIAN), // FIXME: non-canonical
Decoder.ofLong().withByteOrder(ByteOrder.LITTLE_ENDIAN), // FIXME: non-canonical
Decoder.ofByteArray().map(DeltaMetaEntry::parseObjectList));
private static List<DeltaObject> parseObjectList(byte[] bytes) {
var byteBuffer = ByteBuffer.wrap(bytes);
List<DeltaObject> objects = new ArrayList<>();
while (byteBuffer.hasRemaining()) {
var type = ObjectType.valueOf(byteBuffer.get());
var checksum = Checksum.readFrom(byteBuffer);
objects.add(new DeltaObject(type, checksum));
}
return objects;
}
/**
* Acquires a {@link Decoder} for the enclosing type.
*
* @return a possibly shared {@link Decoder}.
*/
public static Decoder<DeltaMetaEntry> decoder() {
return DECODER;
}
}
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