/// <summary>
/// Initializes a new instance of the <see cref="GgpkArchive"/> class.
/// </summary>
/// <param name="fileName">The ggpk archive file.</param>
/// <exception cref="GgpkException">Error while reading the archive.</exception>
internal GgpkArchive(string fileName)
{
IEnumerable <GgpkRecord> records = GgpkRecords.From(fileName);
GgpkMainRecord mainRecord = records.OfType <GgpkMainRecord>().FirstOrDefault();
this.RawRecords = records;
this.root = new GgpkDirectory();
this.FileName = fileName;
if (mainRecord is null)
{
throw new GgpkException($"Error while analyzing the ggpk archive file: no record of type GGPK found");
}
// Convert references in main record (ulong) to type GgpkDirectoryRecordEntry required by BuildDirectoryTree-method
IEnumerable <GgpkDirectoryRecordEntry> createdEntries = mainRecord.RecordOffsets.Select((offset) => new GgpkDirectoryRecordEntry()
{
Offset = offset,
TimeStamp = 0
}).ToList();
// Create record dictionary (which is /much/ faster than querying the IEnumerable with Linq)
Dictionary <ulong, GgpkRecord> recordDictionary = new Dictionary <ulong, GgpkRecord>();
foreach (GgpkRecord record in records)
{
recordDictionary.Add(record.Offset, record);
}
this.BuildDirectoryTree(null, createdEntries, recordDictionary);
}
/// <summary>
/// Reads the given ggpk archive <paramref name="stream"/> and returns all records.
/// </summary>
/// <param name="stream">The ggpk <see cref="Stream"/>.</param>
/// <returns>All records read from the <see cref="Stream"/>.</returns>
/// <exception cref="ArgumentNullException"><c>stream</c> is <c>null</c>.</exception>
/// <exception cref="GgpkException">Error while reading the archive.</exception>
public static IEnumerable <GgpkRecord> From(Stream stream)
{
if (stream is null)
{
throw new ArgumentNullException(nameof(stream));
}
List <GgpkRecord> records = new List <GgpkRecord>();
using (BinaryReader ggpkStreamReader = new BinaryReader(stream))
{
try
{
while (ggpkStreamReader.BaseStream.Position < ggpkStreamReader.BaseStream.Length)
{
GgpkRecordMarker recordMarker = GgpkRecordMarker.From(ggpkStreamReader);
GgpkRecord currentRecord = null;
if (recordMarker.Offset + recordMarker.Length > (ulong)ggpkStreamReader.BaseStream.Length)
{
throw new InvalidDataException($"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);
}
