/// <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($"Error while analyzing the ggpk archive file: no record of type GGPK found");
}
// Convert references in main record (ulong) to type GgpkDirectoryRecordEntry required by BuildDirectoryTree-method
IEnumerable <GgpkDirectoryRecordEntry> createdEntries = mainRecord.RecordOffsets.Select((offset) => new GgpkDirectoryRecordEntry()
{
Offset = offset,
TimeStamp = 0
}).ToList();
// Create record dictionary (which is /much/ faster than querying the IEnumerable with Linq)
Dictionary <ulong, GgpkRecord> recordDictionary = new Dictionary <ulong, GgpkRecord>();
foreach (GgpkRecord record in records)
{
recordDictionary.Add(record.Offset, record);
}
this.BuildDirectoryTree(null, createdEntries, recordDictionary);
}
/// <summary>
/// Builds the directory and file tree.
/// </summary>
/// <param name="currentDirectory">The current directory.</param>
/// <param name="currentDirectoryContent">The desired content of the current directory.</param>
/// <param name="records">All <see cref="GgpkRecord">records</see> from the ggpk archive used to find the references.</param>
private void BuildDirectoryTree(
GgpkDirectory currentDirectory,
IEnumerable <GgpkDirectoryRecordEntry> currentDirectoryContent,
IDictionary <ulong, GgpkRecord> records)
{
foreach (GgpkDirectoryRecordEntry recordEntry in currentDirectoryContent)
{
GgpkRecord referencedRecord = records[recordEntry.Offset];
if (referencedRecord is null)
{
throw new GgpkException($"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}");
}
}
}
/// <summary>
/// Adds a directory to the list of directories.
/// </summary>
/// <param name="directory">The directory to add.</param>
public void Add(GgpkDirectory directory)
{
this.directories.Add(directory);
}