/// <summary> /// Reads a <see cref="GgpkFileRecord"/> from the given <see cref="BinaryReader"/>. /// </summary> /// <param name="marker">The <see cref="GgpkRecordMarker"/> of the record.</param> /// <param name="reader">The <see cref="BinaryReader"/> that shall be read.</param> /// <returns>A <see cref="GgpkFileRecord"/>.</returns> public static GgpkFileRecord From(GgpkRecordMarker marker, BinaryReader reader) { uint fileNameLength = reader.ReadUInt32(); string hash = Convert.ToBase64String(reader.ReadBytes(32)); string fileName = Encoding.Unicode.GetString(reader.ReadBytes((int)fileNameLength * 2)).TrimEnd('\0'); ulong fileOffset = (ulong)reader.BaseStream.Position; ulong fileRecordHeaderLength = fileOffset - marker.Offset; ulong fileLength = marker.Length - fileRecordHeaderLength; GgpkFileRecord record = new GgpkFileRecord { FileName = fileName, Hash = hash, FileOffset = fileOffset, FileLength = fileLength }; // Skip actual file data, move to position of next record reader.BaseStream.Seek((long)record.FileLength, SeekOrigin.Current); return(record); }
/// <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); }