internal void AddEntry(PackArchiveEntry entry)
{
if (_mode == PackArchiveMode.Read)
{
throw new NotSupportedException(Messages.EntriesInReadMode);
}
ThrowIfDisposed();
_entries.Add(entry);
}
private void ReadArchiveFile()
{
var header = default(PackArchiveData.Header);
header.Deserialize(_archiveReader);
if (header.Signature != VFSPackArchiveSignature)
{
throw new Exception(Messages.FileHeaderCorrupted);
}
if (header.NumEntries < 0 || header.OffsetString < 0 || header.OffsetData < 0 || header.OffsetData < header.OffsetString)
{
throw new Exception(Messages.InvalidParameters);
}
long position = _archiveStream.Position;
_archiveStream.Position = header.OffsetString;
_dataOffset = header.OffsetData;
var stringLength = (int)(header.OffsetData - header.OffsetString);
var entriesCount = (header.OffsetString - position) / PackArchiveData.FileData.Size;
var stringBuffer = new byte[stringLength];
if (stringLength != _archiveReader.Read(stringBuffer, 0, stringLength))
{
throw new Exception(Messages.InvalidStringTable);
}
if (entriesCount != header.NumEntries)
{
throw new Exception(Messages.InvalidEntriesTable);
}
_stringTable = Encoding.Unicode.GetString(stringBuffer);
_archiveStream.Position = position;
_entriesCount = header.NumEntries;
var fileData = new PackArchiveData.FileData[_entriesCount];
for (long i = 0; i < _entriesCount; i++)
{
fileData[i].Deserialize(_archiveReader);
var type = (PackArchiveEntry.EntryType)fileData[i].Type;
var name = _stringTable.Substring(fileData[i].NameOffset, fileData[i].NameLength);
var entry = new PackArchiveEntry(type, name, name, fileData[i].DataSize, fileData[i].DataOffset);
_entries.Add(entry);
}
_readEntries = true;
UpdatePath(_entries[0], String.Empty);
}
private void UpdatePath(PackArchiveEntry entry, string parent)
{
if (entry.Offset == 0)
{
return;
}
entry.Path = Path.Combine(parent, entry.Name);
for (int i = 0; i < entry.Count; i++)
{
var index = Convert.ToInt32(entry.Offset + i);
UpdatePath(_entries[index], entry.Path);
}
}
public Stream Open(PackArchiveEntry entry)
{
if (entry.Type == PackArchiveEntry.EntryType.Directory)
{
return(new MemoryStream());
}
var size = entry.Size;
var offset = _dataOffset + entry.Offset;
var buffer = new byte[size];
if (offset + size > _archiveSize)
{
throw new InvalidOperationException(Messages.UnexpectedEndOfStream);
}
_archiveStream.Position = offset;
_archiveStream.Read(buffer, 0, size);
return(new MemoryStream(buffer));
}
public static void ExtractToFile(this PackArchive source, PackArchiveEntry entry, string destinationFileName, bool overwrite)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (destinationFileName == null)
{
throw new ArgumentNullException("destinationFileName");
}
var mode = overwrite ? FileMode.Create : FileMode.CreateNew;
using (var stream = File.Open(destinationFileName, mode, FileAccess.Write, FileShare.None))
{
using (var stream2 = source.Open(entry))
{
stream2.CopyTo(stream);
}
}
}
private static void DoCreateFromDirectory(PackArchive archive, PackArchiveEntry rootEntry, DirectoryInfo rootInfo)
{
var countBefore = archive.GetEntryCount();
var directories = rootInfo.GetDirectories();
var files = rootInfo.GetFiles();
var index = 0;
for (int i = 0; i < directories.Length; i++)
{
if (IsNormalDirectory(directories[i].Attributes))
{
archive.AddEntry(CreateDirectory(rootEntry.Path, directories[i].Name, 0));
directories[index++] = directories[i];
}
}
for (int j = 0; j < files.Length; j++)
{
if (IsNormalFile(files[j].Attributes))
{
archive.AddEntry(CreateFile(rootEntry.Path, files[j].Name, (int)files[j].Length));
}
}
int countAfter = archive.GetEntryCount();
rootEntry.Offset = countBefore;
rootEntry.Count = countAfter - countBefore;
index = 0;
for (int i = countBefore; i < countAfter; i++)
{
if (archive.GetEntry(i).Type == PackArchiveEntry.EntryType.Directory)
{
DoCreateFromDirectory(archive, archive.GetEntry(i), directories[index++]);
}
}
}
