/// <summary>
/// Generate an index (.idx) from an existing archive (.bin).
/// </summary>
/// <param name="archive">Archive handle</param>
/// <param name="pathIdMapping">Dictionary that maps path IDs to strings</param>
/// <param name="skipUnmappedEntries">Skip entries if the path ID isn't present in the dictionary</param>
public static PackfileIndex RebuildFromArchive(Packfile archive, Dictionary <ulong, string> pathIdMapping, bool skipUnmappedEntries)
{
var index = new PackfileIndex();
foreach (var fileEntry in archive.FileEntries)
{
if (skipUnmappedEntries && !pathIdMapping.ContainsKey(fileEntry.PathHash))
{
continue;
}
index._entries.Add(new IndexEntry()
{
FilePath = $"cache:{pathIdMapping[fileEntry.PathHash]}",
FileDataHash = new byte[16] {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
},
DecompressedOffset = fileEntry.DecompressedOffset,
DecompressedSize = fileEntry.DecompressedSize,
});
}
index._entries.Sort((x, y) => x.DecompressedOffset.CompareTo(y.DecompressedOffset));
return(index);
}
/// <summary>
/// Try to gather core file path strings from an archive index file.
/// </summary>
/// <param name="indexFilePath">Disk path to an .idx file</param>
private void TryLoadIndexFileNames(string indexFilePath)
{
if (!File.Exists(indexFilePath))
{
return;
}
var index = PackfileIndex.FromFile(indexFilePath);
// TryAdd will skip over duplicate paths
foreach (var entry in index.Entries)
{
_hashedCorePathToString.TryAdd(Packfile.GetHashForPath(entry.FilePath), entry.FilePath);
}
}
/// <summary>
/// Deserialize a PackfileIndex entry from a BinaryReader.
/// </summary>
/// <param name="reader">Source stream</param>
public static PackfileIndex FromData(BinaryReader reader)
{
var index = new PackfileIndex();
uint magic = reader.ReadUInt32();
uint entryCount = reader.ReadUInt32();
if (magic != HardcodedMagic)
{
throw new InvalidDataException("Unknown header magic");
}
index._entries = new List <IndexEntry>((int)entryCount);
for (uint i = 0; i < entryCount; i++)
{
index._entries.Add(IndexEntry.FromData(reader));
}
return(index);
}
