/// <summary>
/// Perform the initial read on an entry which may include
/// reading encryption headers and setting up inflation.
/// </summary>
/// <param name="destination">The destination to fill with data read.</param>
/// <param name="offset">The offset to start reading at.</param>
/// <param name="count">The maximum number of bytes to read.</param>
/// <returns>The actual number of bytes read.</returns>
int InitialRead(byte[] destination, int offset, int count)
{
if (!CanDecompressEntry)
{
throw new BlubbZipException("Library cannot extract this entry. Version required is (" + entry.Version.ToString() + ")");
}
// Handle encryption if required.
if (entry.IsCrypted)
{
if (password == null)
{
throw new BlubbZipException("No password set.");
}
// Generate and set crypto transform...
PkblubbClassicManaged managed = new PkblubbClassicManaged();
byte[] key = PkblubbClassic.GenerateKeys(BlubbZipConstants.ConvertToArray(password));
inputBuffer.CryptoTransform = managed.CreateDecryptor(key, null);
byte[] cryptbuffer = new byte[BlubbZipConstants.CryptoHeaderSize];
inputBuffer.ReadClearTextBuffer(cryptbuffer, 0, BlubbZipConstants.CryptoHeaderSize);
if (cryptbuffer[BlubbZipConstants.CryptoHeaderSize - 1] != entry.CryptoCheckValue)
{
throw new BlubbZipException("Invalid password");
}
if (csize >= BlubbZipConstants.CryptoHeaderSize)
{
csize -= BlubbZipConstants.CryptoHeaderSize;
}
else if ((entry.Flags & (int)GeneralBitFlags.Descriptor) == 0)
{
throw new BlubbZipException(string.Format("Entry compressed size {0} too small for encryption", csize));
}
}
else
{
inputBuffer.CryptoTransform = null;
}
if ((csize > 0) || ((flags & (int)GeneralBitFlags.Descriptor) != 0))
{
if ((method == (int)CompressionMethod.Deflated) && (inputBuffer.Available > 0))
{
inputBuffer.SetInflaterInput(inf);
}
internalReader = new ReadDataHandler(BodyRead);
return(BodyRead(destination, offset, count));
}
else
{
internalReader = new ReadDataHandler(ReadingNotAvailable);
return(0);
}
}
/// <summary>
/// Set the blubb file comment.
/// </summary>
/// <param name="comment">
/// The comment text for the entire archive.
/// </param>
/// <exception name ="ArgumentOutOfRangeException">
/// The converted comment is longer than 0xffff bytes.
/// </exception>
public void SetComment(string comment)
{
// TODO: Its not yet clear how to handle unicode comments here.
byte[] commentBytes = BlubbZipConstants.ConvertToArray(comment);
if (commentBytes.Length > 0xffff)
{
throw new ArgumentOutOfRangeException("comment");
}
blubbComment = commentBytes;
}
/// <summary>
/// Starts a new Blubb entry. It automatically closes the previous
/// entry if present.
/// All entry elements bar name are optional, but must be correct if present.
/// If the compression method is stored and the output is not patchable
/// the compression for that entry is automatically changed to deflate level 0
/// </summary>
/// <param name="entry">
/// the entry.
/// </param>
/// <exception cref="System.ArgumentNullException">
/// if entry passed is null.
/// </exception>
/// <exception cref="System.IO.IOException">
/// if an I/O error occured.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// if stream was finished
/// </exception>
/// <exception cref="BlubbException">
/// Too many entries in the Blubb file<br/>
/// Entry name is too long<br/>
/// Finish has already been called<br/>
/// </exception>
public void PutNextEntry(BlubbZipEntry entry)
{
if (entry == null)
{
throw new ArgumentNullException("entry");
}
if (entries == null)
{
throw new InvalidOperationException("BlubbOutputStream was finished");
}
if (curEntry != null)
{
CloseEntry();
}
if (entries.Count == int.MaxValue)
{
throw new BlubbZipException("Too many entries for Blubb file");
}
CompressionMethod method = entry.CompressionMethod;
int compressionLevel = defaultCompressionLevel;
// Clear flags that the library manages internally
entry.Flags &= (int)GeneralBitFlags.UnicodeText;
patchEntryHeader = false;
bool headerInfoAvailable;
// No need to compress - definitely no data.
if (entry.Size == 0)
{
entry.CompressedSize = entry.Size;
entry.Crc = 0;
method = CompressionMethod.Stored;
headerInfoAvailable = true;
}
else
{
headerInfoAvailable = (entry.Size >= 0) && entry.HasCrc;
// Switch to deflation if storing isnt possible.
if (method == CompressionMethod.Stored)
{
if (!headerInfoAvailable)
{
if (!CanPatchEntries)
{
// Can't patch entries so storing is not possible.
method = CompressionMethod.Deflated;
compressionLevel = 0;
}
}
else
{
// entry.size must be > 0
entry.CompressedSize = entry.Size;
headerInfoAvailable = entry.HasCrc;
}
}
}
if (headerInfoAvailable == false)
{
if (CanPatchEntries == false)
{
// Only way to record size and compressed size is to append a data descriptor
// after compressed data.
// Stored entries of this form have already been converted to deflating.
entry.Flags |= 8;
}
else
{
patchEntryHeader = true;
}
}
if (Password != null)
{
entry.IsCrypted = true;
if (entry.Crc < 0)
{
// Need to append a data descriptor as the crc isnt available for use
// with encryption, the date is used instead. Setting the flag
// indicates this to the decompressor.
entry.Flags |= 8;
}
}
entry.Offset = offset;
entry.CompressionMethod = (CompressionMethod)method;
curMethod = method;
sizePatchPos = -1;
if (useBlubb64_ == UseBlubb64.On || (entry.Size < 0 && useBlubb64_ == UseBlubb64.Dynamic))
{
entry.ForceBlubb64();
}
// Write the local file header
WriteLeInt(BlubbZipConstants.LocalHeaderSignature);
WriteLeShort(entry.Version);
WriteLeShort(entry.Flags);
WriteLeShort((byte)method);
WriteLeInt((int)entry.DosTime);
// TODO: Refactor header writing. Its done in several places.
if (headerInfoAvailable == true)
{
WriteLeInt((int)entry.Crc);
if (entry.LocalHeaderRequiresBlubb64)
{
WriteLeInt(-1);
WriteLeInt(-1);
}
else
{
WriteLeInt(entry.IsCrypted ? (int)entry.CompressedSize + BlubbZipConstants.CryptoHeaderSize : (int)entry.CompressedSize);
WriteLeInt((int)entry.Size);
}
}
else
{
if (patchEntryHeader == true)
{
crcPatchPos = baseOutputStream_.Position;
}
WriteLeInt(0); // Crc
if (patchEntryHeader)
{
sizePatchPos = baseOutputStream_.Position;
}
// For local header both sizes appear in Blubb64 Extended Information
if (entry.LocalHeaderRequiresBlubb64 || patchEntryHeader)
{
WriteLeInt(-1);
WriteLeInt(-1);
}
else
{
WriteLeInt(0); // Compressed size
WriteLeInt(0); // Uncompressed size
}
}
byte[] name = BlubbZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xFFFF)
{
throw new BlubbZipException("Entry name too long.");
}
BlubbZipExtraData ed = new BlubbZipExtraData(entry.ExtraData);
if (entry.LocalHeaderRequiresBlubb64)
{
ed.StartNewEntry();
if (headerInfoAvailable)
{
ed.AddLeLong(entry.Size);
ed.AddLeLong(entry.CompressedSize);
}
else
{
ed.AddLeLong(-1);
ed.AddLeLong(-1);
}
ed.AddNewEntry(1);
if (!ed.Find(1))
{
throw new BlubbZipException("Internal error cant find extra data");
}
if (patchEntryHeader)
{
sizePatchPos = ed.CurrentReadIndex;
}
}
else
{
ed.Delete(1);
}
byte[] extra = ed.GetEntryData();
WriteLeShort(name.Length);
WriteLeShort(extra.Length);
if (name.Length > 0)
{
baseOutputStream_.Write(name, 0, name.Length);
}
if (entry.LocalHeaderRequiresBlubb64 && patchEntryHeader)
{
sizePatchPos += baseOutputStream_.Position;
}
if (extra.Length > 0)
{
baseOutputStream_.Write(extra, 0, extra.Length);
}
offset += BlubbZipConstants.LocalHeaderBaseSize + name.Length + extra.Length;
// Activate the entry.
curEntry = entry;
crc.Reset();
if (method == CompressionMethod.Deflated)
{
deflater_.Reset();
deflater_.SetLevel(compressionLevel);
}
size = 0;
if (entry.IsCrypted == true)
{
if (entry.Crc < 0) // so testing Blubb will says its ok
{
WriteEncryptionHeader(entry.DosTime << 16);
}
else
{
WriteEncryptionHeader(entry.Crc);
}
}
}
/// <summary>
/// Finishes the stream. This will write the central directory at the
/// end of the blubb file and flush the stream.
/// </summary>
/// <remarks>
/// This is automatically called when the stream is closed.
/// </remarks>
/// <exception cref="System.IO.IOException">
/// An I/O error occurs.
/// </exception>
/// <exception cref="BlubbException">
/// Comment exceeds the maximum length<br/>
/// Entry name exceeds the maximum length
/// </exception>
public override void Finish()
{
if (entries == null)
{
return;
}
if (curEntry != null)
{
CloseEntry();
}
long numEntries = entries.Count;
long sizeEntries = 0;
foreach (BlubbZipEntry entry in entries)
{
WriteLeInt(BlubbZipConstants.CentralHeaderSignature);
WriteLeShort(BlubbZipConstants.VersionMadeBy);
WriteLeShort(entry.Version);
WriteLeShort(entry.Flags);
WriteLeShort((short)entry.CompressionMethod);
WriteLeInt((int)entry.DosTime);
WriteLeInt((int)entry.Crc);
if (entry.IsBlubb64Forced() ||
(entry.CompressedSize >= uint.MaxValue))
{
WriteLeInt(-1);
}
else
{
WriteLeInt((int)entry.CompressedSize);
}
if (entry.IsBlubb64Forced() ||
(entry.Size >= uint.MaxValue))
{
WriteLeInt(-1);
}
else
{
WriteLeInt((int)entry.Size);
}
byte[] name = BlubbZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xffff)
{
throw new BlubbZipException("Name too long.");
}
BlubbZipExtraData ed = new BlubbZipExtraData(entry.ExtraData);
if (entry.CentralHeaderRequiresBlubb64)
{
ed.StartNewEntry();
if (entry.IsBlubb64Forced() ||
(entry.Size >= 0xffffffff))
{
ed.AddLeLong(entry.Size);
}
if (entry.IsBlubb64Forced() ||
(entry.CompressedSize >= 0xffffffff))
{
ed.AddLeLong(entry.CompressedSize);
}
if (entry.Offset >= 0xffffffff)
{
ed.AddLeLong(entry.Offset);
}
ed.AddNewEntry(1);
}
else
{
ed.Delete(1);
}
byte[] extra = ed.GetEntryData();
byte[] entryComment =
(entry.Comment != null) ?
BlubbZipConstants.ConvertToArray(entry.Flags, entry.Comment) :
new byte[0];
if (entryComment.Length > 0xffff)
{
throw new BlubbZipException("Comment too long.");
}
WriteLeShort(name.Length);
WriteLeShort(extra.Length);
WriteLeShort(entryComment.Length);
WriteLeShort(0); // disk number
WriteLeShort(0); // internal file attributes
// external file attributes
if (entry.ExternalFileAttributes != -1)
{
WriteLeInt(entry.ExternalFileAttributes);
}
else
{
if (entry.IsDirectory)
{
WriteLeInt(16);
}
else
{
WriteLeInt(0);
}
}
if (entry.Offset >= uint.MaxValue)
{
WriteLeInt(-1);
}
else
{
WriteLeInt((int)entry.Offset);
}
if (name.Length > 0)
{
baseOutputStream_.Write(name, 0, name.Length);
}
if (extra.Length > 0)
{
baseOutputStream_.Write(extra, 0, extra.Length);
}
if (entryComment.Length > 0)
{
baseOutputStream_.Write(entryComment, 0, entryComment.Length);
}
sizeEntries += BlubbZipConstants.CentralHeaderBaseSize + name.Length + extra.Length + entryComment.Length;
}
using (BlubbZipHelperStream zhs = new BlubbZipHelperStream(baseOutputStream_)) {
zhs.WriteEndOfCentralDirectory(numEntries, sizeEntries, offset, blubbComment);
}
entries = null;
}
// Write the local file header
// TODO: BlubbHelperStream.WriteLocalHeader is not yet used and needs checking for BlubbFile and BlubbOuptutStream usage
void WriteLocalHeader(BlubbZipEntry entry, EntryPatchData patchData)
{
CompressionMethod method = entry.CompressionMethod;
bool headerInfoAvailable = true; // How to get this?
bool patchEntryHeader = false;
WriteLEInt(BlubbZipConstants.LocalHeaderSignature);
WriteLEShort(entry.Version);
WriteLEShort(entry.Flags);
WriteLEShort((byte)method);
WriteLEInt((int)entry.DosTime);
if (headerInfoAvailable == true)
{
WriteLEInt((int)entry.Crc);
if (entry.LocalHeaderRequiresBlubb64)
{
WriteLEInt(-1);
WriteLEInt(-1);
}
else
{
WriteLEInt(entry.IsCrypted ? (int)entry.CompressedSize + BlubbZipConstants.CryptoHeaderSize : (int)entry.CompressedSize);
WriteLEInt((int)entry.Size);
}
}
else
{
if (patchData != null)
{
patchData.CrcPatchOffset = stream_.Position;
}
WriteLEInt(0); // Crc
if (patchData != null)
{
patchData.SizePatchOffset = stream_.Position;
}
// For local header both sizes appear in Blubb64 Extended Information
if (entry.LocalHeaderRequiresBlubb64 && patchEntryHeader)
{
WriteLEInt(-1);
WriteLEInt(-1);
}
else
{
WriteLEInt(0); // Compressed size
WriteLEInt(0); // Uncompressed size
}
}
byte[] name = BlubbZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xFFFF)
{
throw new BlubbZipException("Entry name too long.");
}
BlubbZipExtraData ed = new BlubbZipExtraData(entry.ExtraData);
if (entry.LocalHeaderRequiresBlubb64 && (headerInfoAvailable || patchEntryHeader))
{
ed.StartNewEntry();
if (headerInfoAvailable)
{
ed.AddLeLong(entry.Size);
ed.AddLeLong(entry.CompressedSize);
}
else
{
ed.AddLeLong(-1);
ed.AddLeLong(-1);
}
ed.AddNewEntry(1);
if (!ed.Find(1))
{
throw new BlubbZipException("Internal error cant find extra data");
}
if (patchData != null)
{
patchData.SizePatchOffset = ed.CurrentReadIndex;
}
}
else
{
ed.Delete(1);
}
byte[] extra = ed.GetEntryData();
WriteLEShort(name.Length);
WriteLEShort(extra.Length);
if (name.Length > 0)
{
stream_.Write(name, 0, name.Length);
}
if (entry.LocalHeaderRequiresBlubb64 && patchEntryHeader)
{
patchData.SizePatchOffset += stream_.Position;
}
if (extra.Length > 0)
{
stream_.Write(extra, 0, extra.Length);
}
}