private List <TarEntry> _internal_ListOrExtract(string archive, bool wantExtract, string path)
{
var entryList = new List <TarEntry>();
byte[] block = new byte[512];
int n = 0;
int blocksToMunch = 0;
int remainingBytes = 0;
Stream output = null;
DateTime mtime = DateTime.Now;
string name = null;
TarEntry entry = null;
var deferredDirTimestamp = new Dictionary <String, DateTime>();
if (!File.Exists(archive))
{
throw new InvalidOperationException("The specified file does not exist.");
}
using (Stream fs = _internal_GetInputStream(archive))
{
while ((n = fs.Read(block, 0, block.Length)) > 0)
{
if (blocksToMunch > 0)
{
if (output != null)
{
int bytesToWrite = (block.Length < remainingBytes)
? block.Length
: remainingBytes;
output.Write(block, 0, bytesToWrite);
remainingBytes -= bytesToWrite;
}
blocksToMunch--;
if (blocksToMunch == 0)
{
if (output != null)
{
if (output is MemoryStream)
{
entry.Name = name = System.Text.Encoding.ASCII.GetString((output as MemoryStream).ToArray()).TrimNull();
}
output.Close();
output.Dispose();
if (output is FileStream && !TarOptions.DoNotSetTime)
{
File.SetLastWriteTimeUtc(name, mtime);
}
output = null;
}
}
continue;
}
HeaderBlock hb = serializer.RawDeserialize(block);
if (!hb.VerifyChksum())
{
throw new Exception("header checksum is invalid.");
}
if (entry == null || entry.Type != TarEntryType.GnuLongName)
{
name = hb.GetName();
}
if (name == null || name.Length == 0)
{
break;
}
mtime = hb.GetMtime();
remainingBytes = hb.GetSize();
if (hb.typeflag == 0)
{
hb.typeflag = (byte)'0';
}
entry = new TarEntry()
{
Name = name, Mtime = mtime, Size = remainingBytes, @Type = (TarEntryType)hb.typeflag
};
if (entry.Type != TarEntryType.GnuLongName)
{
entryList.Add(entry);
}
blocksToMunch = (remainingBytes > 0)
? ((remainingBytes - 1) / 512) + 1
: 0;
if (entry.Type == TarEntryType.GnuLongName)
{
if (name != "././@LongLink")
{
if (wantExtract)
{
throw new Exception(String.Format("unexpected name for type 'L' (expected '././@LongLink', got '{0}')", name));
}
}
output = new MemoryStream();
continue;
}
if (wantExtract)
{
name = path + name;
switch (entry.Type)
{
case TarEntryType.Directory:
if (!Directory.Exists(name))
{
Directory.CreateDirectory(name);
if (!TarOptions.DoNotSetTime)
{
deferredDirTimestamp.Add(name.TrimSlash(), mtime);
}
}
else if (TarOptions.Overwrite)
{
if (!TarOptions.DoNotSetTime)
{
deferredDirTimestamp.Add(name.TrimSlash(), mtime);
}
}
break;
case TarEntryType.File_Old:
case TarEntryType.File:
case TarEntryType.File_Contiguous:
string p = Path.GetDirectoryName(name);
if (!String.IsNullOrEmpty(p))
{
if (!Directory.Exists(p))
{
Directory.CreateDirectory(p);
}
}
output = _internal_GetExtractOutputStream(name);
break;
case TarEntryType.GnuVolumeHeader:
case TarEntryType.CharSpecial:
case TarEntryType.BlockSpecial:
break;
case TarEntryType.SymbolicLink:
break;
default:
throw new Exception(String.Format("unsupported entry type ({0})", hb.typeflag));
}
}
}
}
if (deferredDirTimestamp.Count > 0)
{
foreach (var s in deferredDirTimestamp.Keys)
{
Directory.SetLastWriteTimeUtc(s, deferredDirTimestamp[s]);
}
}
return(entryList);
}
private List <TarEntry> listOrExtract(Stream file, string extractDirectory)
{
bool wantExtract = extractDirectory != null;
var entryList = new List <TarEntry>();
byte[] block = new byte[512];
int n = 0;
int blocksToMunch = 0;
int remainingBytes = 0;
Stream output = null;
DateTime mtime = DateTime.Now;
string name = null;
TarEntry entry = null;
var deferredDirTimestamp = new Dictionary <String, DateTime>();
while ((n = file.Read(block, 0, block.Length)) > 0)
{
if (blocksToMunch > 0)
{
if (output != null)
{
int bytesToWrite = (block.Length < remainingBytes)
? block.Length
: remainingBytes;
output.Write(block, 0, bytesToWrite);
remainingBytes -= bytesToWrite;
}
blocksToMunch--;
//System.Diagnostics.Debugger.Break();
if (blocksToMunch == 0)
{
if (output != null)
{
if (output is MemoryStream)
{
entry.Name = name = System.Text.Encoding.ASCII.GetString((output as MemoryStream).ToArray()).TrimNull();
}
output.Close();
output.Dispose();
if (output is FileStream)
{
File.SetLastWriteTimeUtc(Path.Combine(extractDirectory, name), mtime);
}
output = null;
}
}
continue;
}
HeaderBlock hb = serializer.RawDeserialize(block);
//System.Diagnostics.Debugger.Break();
if (!hb.VerifyChksum())
{
throw new Exception("header checksum is invalid.");
}
// if this is the first entry, or if the prior entry is not a GnuLongName
if (entry == null || entry.Type != TarEntryType.GnuLongName)
{
name = hb.GetName();
}
if (name == null || name.Length == 0)
{
break; // EOF
}
mtime = hb.GetMtime();
remainingBytes = hb.GetSize();
if (hb.typeflag == 0)
{
hb.typeflag = (byte)'0'; // coerce old-style GNU type to posix tar type
}
entry = new TarEntry()
{
Name = name, Mtime = mtime, Size = remainingBytes, @Type = (TarEntryType)hb.typeflag
};
if (entry.Type != TarEntryType.GnuLongName)
{
entryList.Add(entry);
}
blocksToMunch = (remainingBytes > 0)
? ((remainingBytes - 1) / 512) + 1
: 0;
if (entry.Type == TarEntryType.GnuLongName)
{
if (name != "././@LongLink")
{
if (wantExtract)
{
throw new Exception(String.Format("unexpected name for type 'L' (expected '././@LongLink', got '{0}')", name));
}
}
// for GNU long names, we extract the long name info into a memory stream
output = new MemoryStream();
continue;
}
if (wantExtract)
{
var extractPath = Path.Combine(extractDirectory, name);
switch (entry.Type)
{
case TarEntryType.Directory:
if (!Directory.Exists(extractPath))
{
Directory.CreateDirectory(extractPath);
// cannot set the time on the directory now, or it will be updated
// by future file writes. Defer until after all file writes are done.
deferredDirTimestamp.Add(extractPath.TrimSlash(), mtime);
}
else
{
deferredDirTimestamp.Add(extractPath.TrimSlash(), mtime);
}
break;
case TarEntryType.File_Old:
case TarEntryType.File:
case TarEntryType.File_Contiguous:
string p = Path.GetDirectoryName(extractPath);
if (!String.IsNullOrEmpty(p))
{
if (!Directory.Exists(p))
{
Directory.CreateDirectory(p);
}
}
output = getOutputStream(extractPath);
break;
case TarEntryType.GnuVolumeHeader:
case TarEntryType.CharSpecial:
case TarEntryType.BlockSpecial:
// do nothing on extract
break;
case TarEntryType.SymbolicLink:
break;
// can support other types here - links, etc
default:
throw new Exception(String.Format("unsupported entry type ({0})", hb.typeflag));
}
}
}
// apply the deferred timestamps on the directories
if (deferredDirTimestamp.Count > 0)
{
foreach (var s in deferredDirTimestamp.Keys)
{
Directory.SetLastWriteTimeUtc(s, deferredDirTimestamp[s]);
}
}
return(entryList);
}