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| /* ### | |
| * IP: Public Domain | |
| */ | |
| package mobiledevices.dmg.btree; | |
| import java.io.IOException; | |
| import mobiledevices.dmg.ghidra.GBinaryReader; | |
| /** | |
| * Represents a Map Record. | |
| * | |
| * @see <a href="https://developer.apple.com/library/archive/technotes/tn/tn1150.html">Map Record</a> | |
| */ | |
| public class BTreeMapRecord /*implements StructConverter*/ { | |
| private byte[] bitmap; | |
| protected BTreeMapRecord(GBinaryReader reader, BTreeHeaderRecord headerRecord) | |
| throws IOException { | |
| this.bitmap = reader.readNextByteArray(headerRecord.getNodeSize() - 256); | |
| } | |
| /** | |
| * Returns the map record node allocation bitmap. | |
| * @return the map record node allocation bitmap | |
| */ | |
| public byte[] getBitmap() { | |
| return bitmap; | |
| } | |
| /** | |
| * Returns true if the specified node index is used. | |
| * Returns false if the specified node index is free. | |
| * @param nodeIndex the node index | |
| * @return true if the specified node index is used, false if free | |
| */ | |
| public boolean isNodeUsed(int nodeIndex) { | |
| int block = bitmap[nodeIndex / 8] & 0xff; | |
| return (block & (1 << 7 - (nodeIndex % 8))) != 0; | |
| } | |
| // @Override | |
| // public DataType toDataType() throws DuplicateNameException, IOException { | |
| // return StructConverterUtil.toDataType( this ); | |
| // } | |
| } |