/// <summary> /// Reads the given ggpk archive <paramref name="stream"/> and returns all records. /// </summary> /// <param name="stream">The ggpk <see cref="Stream"/>.</param> /// <returns>All records read from the <see cref="Stream"/>.</returns> /// <exception cref="ArgumentNullException"><c>stream</c> is <c>null</c>.</exception> /// <exception cref="GgpkException">Error while reading the archive.</exception> public static IEnumerable <GgpkRecord> From(Stream stream) { if (stream is null) { throw new ArgumentNullException(nameof(stream)); } List <GgpkRecord> records = new List <GgpkRecord>(); using (BinaryReader ggpkStreamReader = new BinaryReader(stream)) { try { while (ggpkStreamReader.BaseStream.Position < ggpkStreamReader.BaseStream.Length) { GgpkRecordMarker recordMarker = GgpkRecordMarker.From(ggpkStreamReader); GgpkRecord currentRecord = null; if (recordMarker.Offset + recordMarker.Length > (ulong)ggpkStreamReader.BaseStream.Length) { throw new InvalidDataException($"Invalid record length {recordMarker.Length} at offset {recordMarker.Offset}"); } switch (recordMarker.Type) { case "GGPK": currentRecord = GgpkMainRecord.From(ggpkStreamReader); break; case "FREE": currentRecord = GgpkFreeRecord.From(recordMarker, ggpkStreamReader); break; case "FILE": currentRecord = GgpkFileRecord.From(recordMarker, ggpkStreamReader); break; case "PDIR": currentRecord = GgpkDirectoryRecord.From(ggpkStreamReader); break; default: throw new InvalidDataException($"Unknown record type {recordMarker.Type} at offset {recordMarker.Offset}"); } currentRecord.Offset = recordMarker.Offset; currentRecord.Length = recordMarker.Length; records.Add(currentRecord); } } catch (Exception ex) { throw new GgpkException($"Error while parsing the ggpk archive file", ex) { Offset = ggpkStreamReader.BaseStream.Position }; } } return(records); }
/// <summary> /// Builds the directory and file tree. /// </summary> /// <param name="currentDirectory">The current directory.</param> /// <param name="currentDirectoryContent">The desired content of the current directory.</param> /// <param name="records">All <see cref="GgpkRecord">records</see> from the ggpk archive used to find the references.</param> private void BuildDirectoryTree( GgpkDirectory currentDirectory, IEnumerable <GgpkDirectoryRecordEntry> currentDirectoryContent, IDictionary <ulong, GgpkRecord> records) { foreach (GgpkDirectoryRecordEntry recordEntry in currentDirectoryContent) { GgpkRecord referencedRecord = records[recordEntry.Offset]; if (referencedRecord is null) { throw new GgpkException($"Error while analyzing the ggpk archive file: no element found at offset {recordEntry.Offset}"); } switch (referencedRecord) { case GgpkDirectoryRecord directoryRecord: GgpkDirectory directory = new GgpkDirectory() { Name = directoryRecord.DirectoryName, TimeStamp = recordEntry.TimeStamp, Hash = directoryRecord.Hash, Parent = currentDirectory, ArchiveFileName = this.FileName }; if (currentDirectory != null) { currentDirectory.Add(directory); } else { this.root = directory; } this.BuildDirectoryTree(directory, directoryRecord.Entries, records); break; case GgpkFileRecord fileRecord: GgpkFile file = new GgpkFile() { Name = fileRecord.FileName, TimeStamp = recordEntry.TimeStamp, Hash = fileRecord.Hash, Offset = fileRecord.FileOffset, Length = fileRecord.FileLength, Parent = currentDirectory, ArchiveFileName = this.FileName }; currentDirectory.Add(file); break; case GgpkFreeRecord freeRecord: break; default: throw new GgpkException($"Error while analyzing the ggpk archive file: no element of type directory or file found at offset {recordEntry.Offset}"); } } }