/// <summary>
/// Set the data from the raw values provided.
/// </summary>
/// <param name="data">The raw data to extract values from.</param>
/// <param name="index">The index to start extracting values from.</param>
/// <param name="count">The number of bytes available.</param>
public void SetData(byte[] data, int index, int count)
{
using (MemoryStream ms = new MemoryStream(data, index, count, false))
using (ZipHelperStream helperStream = new ZipHelperStream(ms))
{
helperStream.ReadLEInt(); // Reserved
while (helperStream.Position < helperStream.Length)
{
int ntfsTag = helperStream.ReadLEShort();
int ntfsLength = helperStream.ReadLEShort();
if (ntfsTag == 1)
{
if (ntfsLength >= 24)
{
long lastModificationTicks = helperStream.ReadLELong();
lastModificationTime_ = DateTime.FromFileTime(lastModificationTicks);
long lastAccessTicks = helperStream.ReadLELong();
lastAccessTime_ = DateTime.FromFileTime(lastAccessTicks);
long createTimeTicks = helperStream.ReadLELong();
createTime_ = DateTime.FromFileTime(createTimeTicks);
}
break;
}
else
{
// An unknown NTFS tag so simply skip it.
helperStream.Seek(ntfsLength, SeekOrigin.Current);
}
}
}
}
/// <summary>
/// Get the binary data representing this instance.
/// </summary>
/// <returns>The raw binary data representing this instance.</returns>
public byte[] GetData()
{
using (MemoryStream ms = new MemoryStream())
using (ZipHelperStream helperStream = new ZipHelperStream(ms))
{
helperStream.IsStreamOwner = false;
helperStream.WriteLEInt(0); // Reserved
helperStream.WriteLEShort(1); // Tag
helperStream.WriteLEShort(24); // Length = 3 x 8.
helperStream.WriteLELong(lastModificationTime_.ToFileTime());
helperStream.WriteLELong(lastAccessTime_.ToFileTime());
helperStream.WriteLELong(createTime_.ToFileTime());
return ms.ToArray();
}
}
/// <summary>
/// Set the data from the raw values provided.
/// </summary>
/// <param name="data">The raw data to extract values from.</param>
/// <param name="index">The index to start extracting values from.</param>
/// <param name="count">The number of bytes available.</param>
public void SetData(byte[] data, int index, int count)
{
using (MemoryStream ms = new MemoryStream(data, index, count, false))
using (ZipHelperStream helperStream = new ZipHelperStream(ms))
{
// bit 0 if set, modification time is present
// bit 1 if set, access time is present
// bit 2 if set, creation time is present
flags_ = (Flags) helperStream.ReadByte();
if (((flags_ & Flags.ModificationTime) != 0) && (count >= 5))
{
int iTime = helperStream.ReadLEInt();
modificationTime_ = (new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime() +
new TimeSpan(0, 0, 0, iTime, 0)).ToLocalTime();
}
if ((flags_ & Flags.AccessTime) != 0)
{
int iTime = helperStream.ReadLEInt();
lastAccessTime_ = (new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime() +
new TimeSpan(0, 0, 0, iTime, 0)).ToLocalTime();
}
if ((flags_ & Flags.CreateTime) != 0)
{
int iTime = helperStream.ReadLEInt();
createTime_ = (new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime() +
new TimeSpan(0, 0, 0, iTime, 0)).ToLocalTime();
}
}
}
/// <summary>
/// Get the binary data representing this instance.
/// </summary>
/// <returns>The raw binary data representing this instance.</returns>
public byte[] GetData()
{
using (MemoryStream ms = new MemoryStream())
using (ZipHelperStream helperStream = new ZipHelperStream(ms))
{
helperStream.IsStreamOwner = false;
helperStream.WriteByte((byte) flags_); // Flags
if ((flags_ & Flags.ModificationTime) != 0)
{
TimeSpan span = modificationTime_.ToUniversalTime() - new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime();
int seconds = (int) span.TotalSeconds;
helperStream.WriteLEInt(seconds);
}
if ((flags_ & Flags.AccessTime) != 0)
{
TimeSpan span = lastAccessTime_.ToUniversalTime() - new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime();
int seconds = (int) span.TotalSeconds;
helperStream.WriteLEInt(seconds);
}
if ((flags_ & Flags.CreateTime) != 0)
{
TimeSpan span = createTime_.ToUniversalTime() - new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime();
int seconds = (int) span.TotalSeconds;
helperStream.WriteLEInt(seconds);
}
return ms.ToArray();
}
}
// NOTE this returns the offset of the first byte after the signature.
private long LocateBlockWithSignature(int signature, long endLocation, int minimumBlockSize, int maximumVariableData)
{
using (ZipHelperStream les = new ZipHelperStream(baseStream_))
{
return les.LocateBlockWithSignature(signature, endLocation, minimumBlockSize, maximumVariableData);
}
}
/// <summary>
/// Test an archive for integrity/validity
/// </summary>
/// <param name="testData">Perform low level data Crc check</param>
/// <param name="strategy">The <see cref="TestStrategy"></see> to apply.</param>
/// <param name="resultHandler">The <see cref="ZipTestResultHandler"></see> handler to call during testing.</param>
/// <returns>true if all tests pass, false otherwise</returns>
public bool TestArchive(bool testData, TestStrategy strategy, ZipTestResultHandler resultHandler)
{
TestStatus status = new TestStatus(this);
if (resultHandler != null)
{
resultHandler(status, null);
}
HeaderTest test = testData ? (HeaderTest.Header | HeaderTest.Extract) : HeaderTest.Header;
bool testing = true;
try
{
int entryIndex = 0;
while (testing && (entryIndex < Count))
{
if (resultHandler != null)
{
status.SetEntry(this[entryIndex]);
status.SetOperation(TestOperation.EntryHeader);
resultHandler(status, null);
}
try
{
TestLocalHeader(this[entryIndex], test);
}
catch (ZipException ex)
{
status.AddError();
if (resultHandler != null)
{
resultHandler(status,
string.Format("Exception during test - '{0}'", ex.Message));
}
if (strategy == TestStrategy.FindFirstError)
{
testing = false;
}
}
if (testing && testData && this[entryIndex].IsFile)
{
if (resultHandler != null)
{
status.SetOperation(TestOperation.EntryData);
resultHandler(status, null);
}
Stream entryStream = this.GetInputStream(this[entryIndex]);
Crc32 crc = new Crc32();
byte[] buffer = new byte[4096];
long totalBytes = 0;
int bytesRead;
while ((bytesRead = entryStream.Read(buffer, 0, buffer.Length)) > 0)
{
crc.Update(buffer, 0, bytesRead);
if (resultHandler != null)
{
totalBytes += bytesRead;
status.SetBytesTested(totalBytes);
resultHandler(status, null);
}
}
if (this[entryIndex].Crc != crc.Value)
{
status.AddError();
if (resultHandler != null)
{
resultHandler(status, "CRC mismatch");
}
if (strategy == TestStrategy.FindFirstError)
{
testing = false;
}
}
if ((this[entryIndex].Flags & (int) GeneralBitFlags.Descriptor) != 0)
{
ZipHelperStream helper = new ZipHelperStream(baseStream_);
DescriptorData data = new DescriptorData();
helper.ReadDataDescriptor(this[entryIndex].LocalHeaderRequiresZip64, data);
if (this[entryIndex].Crc != data.Crc)
{
status.AddError();
}
if (this[entryIndex].CompressedSize != data.CompressedSize)
{
status.AddError();
}
if (this[entryIndex].Size != data.Size)
{
status.AddError();
}
}
}
if (resultHandler != null)
{
status.SetOperation(TestOperation.EntryComplete);
resultHandler(status, null);
}
entryIndex += 1;
}
if (resultHandler != null)
{
status.SetOperation(TestOperation.MiscellaneousTests);
resultHandler(status, null);
}
// TODO: the 'Corrina Johns' test where local headers are missing from
// the central directory. They are therefore invisible to many archivers.
}
catch (Exception ex)
{
status.AddError();
if (resultHandler != null)
{
resultHandler(status, string.Format("Exception during test - '{0}'", ex.Message));
}
}
if (resultHandler != null)
{
status.SetOperation(TestOperation.Complete);
status.SetEntry(null);
resultHandler(status, null);
}
return (status.ErrorCount == 0);
}
private void RunUpdates()
{
long sizeEntries = 0;
long endOfStream = 0;
bool allOk = true;
bool directUpdate = false;
long destinationPosition = 0; // NOT SFX friendly
ZipFile workFile;
if (IsNewArchive)
{
workFile = this;
workFile.baseStream_.Position = 0;
directUpdate = true;
}
else if (archiveStorage_.UpdateMode == FileUpdateMode.Direct)
{
workFile = this;
workFile.baseStream_.Position = 0;
directUpdate = true;
// Sort the updates by offset within copies/modifies, then adds.
// This ensures that data required by copies will not be overwritten.
updates_.Sort(new UpdateComparer());
}
else
{
workFile = Create(archiveStorage_.GetTemporaryOutput());
workFile.UseZip64 = UseZip64;
if (key != null)
{
workFile.key = (byte[]) key.Clone();
}
}
try
{
foreach (ZipUpdate update in updates_)
{
if (update != null)
{
switch (update.Command)
{
case UpdateCommand.Copy:
if (directUpdate)
{
CopyEntryDirect(workFile, update, ref destinationPosition);
}
else
{
CopyEntry(workFile, update);
}
break;
case UpdateCommand.Modify:
// TODO: Direct modifying of an entry will take some legwork.
ModifyEntry(workFile, update);
break;
case UpdateCommand.Add:
if (!IsNewArchive && directUpdate)
{
workFile.baseStream_.Position = destinationPosition;
}
AddEntry(workFile, update);
if (directUpdate)
{
destinationPosition = workFile.baseStream_.Position;
}
break;
}
}
}
if (!IsNewArchive && directUpdate)
{
workFile.baseStream_.Position = destinationPosition;
}
long centralDirOffset = workFile.baseStream_.Position;
foreach (ZipUpdate update in updates_)
{
if (update != null)
{
sizeEntries += workFile.WriteCentralDirectoryHeader(update.OutEntry);
}
}
byte[] theComment = (newComment_ != null) ? newComment_.RawComment : ZipConstants.ConvertToArray(comment_);
using (ZipHelperStream zhs = new ZipHelperStream(workFile.baseStream_))
{
zhs.WriteEndOfCentralDirectory(updateCount_, sizeEntries, centralDirOffset, theComment);
}
endOfStream = workFile.baseStream_.Position;
// And now patch entries...
foreach (ZipUpdate update in updates_)
{
if (update != null)
{
// If the size of the entry is zero leave the crc as 0 as well.
// The calculated crc will be all bits on...
if ((update.CrcPatchOffset > 0) && (update.OutEntry.CompressedSize > 0))
{
workFile.baseStream_.Position = update.CrcPatchOffset;
workFile.WriteLEInt((int) update.OutEntry.Crc);
}
if (update.SizePatchOffset > 0)
{
workFile.baseStream_.Position = update.SizePatchOffset;
if (update.OutEntry.LocalHeaderRequiresZip64)
{
workFile.WriteLeLong(update.OutEntry.Size);
workFile.WriteLeLong(update.OutEntry.CompressedSize);
}
else
{
workFile.WriteLEInt((int) update.OutEntry.CompressedSize);
workFile.WriteLEInt((int) update.OutEntry.Size);
}
}
}
}
}
catch (Exception)
{
allOk = false;
}
finally
{
if (directUpdate)
{
if (allOk)
{
workFile.baseStream_.Flush();
workFile.baseStream_.SetLength(endOfStream);
}
}
else
{
workFile.Close();
}
}
if (allOk)
{
if (directUpdate)
{
isNewArchive_ = false;
workFile.baseStream_.Flush();
ReadEntries();
}
else
{
baseStream_.Close();
Reopen(archiveStorage_.ConvertTemporaryToFinal());
}
}
else
{
workFile.Close();
if (!directUpdate && (workFile.Name != null))
{
File.Delete(workFile.Name);
}
}
}
private void UpdateCommentOnly()
{
long baseLength = baseStream_.Length;
ZipHelperStream updateFile = null;
if (archiveStorage_.UpdateMode == FileUpdateMode.Safe)
{
Stream copyStream = archiveStorage_.MakeTemporaryCopy(baseStream_);
updateFile = new ZipHelperStream(copyStream);
updateFile.IsStreamOwner = true;
baseStream_.Close();
baseStream_ = null;
}
else
{
if (archiveStorage_.UpdateMode == FileUpdateMode.Direct)
{
// TODO: archiveStorage wasnt originally intended for this use.
// Need to revisit this to tidy up handling as archive storage currently doesnt
// handle the original stream well.
// The problem is when using an existing zip archive with an in memory archive storage.
// The open stream wont support writing but the memory storage should open the same file not an in memory one.
// Need to tidy up the archive storage interface and contract basically.
baseStream_ = archiveStorage_.OpenForDirectUpdate(baseStream_);
updateFile = new ZipHelperStream(baseStream_);
}
else
{
baseStream_.Close();
baseStream_ = null;
updateFile = new ZipHelperStream(Name);
}
}
using (updateFile)
{
long locatedCentralDirOffset =
updateFile.LocateBlockWithSignature(ZipConstants.EndOfCentralDirectorySignature,
baseLength, ZipConstants.EndOfCentralRecordBaseSize, 0xffff);
if (locatedCentralDirOffset < 0)
{
throw new ZipException("Cannot find central directory");
}
const int CentralHeaderCommentSizeOffset = 16;
updateFile.Position += CentralHeaderCommentSizeOffset;
byte[] rawComment = newComment_.RawComment;
updateFile.WriteLEShort(rawComment.Length);
updateFile.Write(rawComment, 0, rawComment.Length);
updateFile.SetLength(updateFile.Position);
}
if (archiveStorage_.UpdateMode == FileUpdateMode.Safe)
{
Reopen(archiveStorage_.ConvertTemporaryToFinal());
}
else
{
ReadEntries();
}
}
private void AddEntry(ZipFile workFile, ZipUpdate update)
{
Stream source = null;
if (update.Entry.IsFile)
{
source = update.GetSource();
if (source == null)
{
source = updateDataSource_.GetSource(update.Entry, update.Filename);
}
}
if (source != null)
{
using (source)
{
long sourceStreamLength = source.Length;
if (update.OutEntry.Size < 0)
{
update.OutEntry.Size = sourceStreamLength;
}
else
{
// Check for errant entries.
if (update.OutEntry.Size != sourceStreamLength)
{
throw new ZipException("Entry size/stream size mismatch");
}
}
workFile.WriteLocalEntryHeader(update);
long dataStart = workFile.baseStream_.Position;
using (Stream output = workFile.GetOutputStream(update.OutEntry))
{
CopyBytes(update, output, source, sourceStreamLength, true);
}
long dataEnd = workFile.baseStream_.Position;
update.OutEntry.CompressedSize = dataEnd - dataStart;
if ((update.OutEntry.Flags & (int) GeneralBitFlags.Descriptor) == (int) GeneralBitFlags.Descriptor)
{
ZipHelperStream helper = new ZipHelperStream(workFile.baseStream_);
helper.WriteDataDescriptor(update.OutEntry);
}
}
}
else
{
workFile.WriteLocalEntryHeader(update);
update.OutEntry.CompressedSize = 0;
}
}
/// <summary>
/// Commit current updates, updating this archive.
/// </summary>
/// <seealso cref="BeginUpdate()"></seealso>
/// <seealso cref="AbortUpdate"></seealso>
public void CommitUpdate()
{
CheckUpdating();
try
{
updateIndex_.Clear();
updateIndex_ = null;
if (contentsEdited_)
{
RunUpdates();
}
else if (commentEdited_)
{
UpdateCommentOnly();
}
else
{
// Create an empty archive if none existed originally.
if ((entries_ != null) && (entries_.Length == 0))
{
byte[] theComment = (newComment_ != null) ? newComment_.RawComment : ZipConstants.ConvertToArray(comment_);
using (ZipHelperStream zhs = new ZipHelperStream(baseStream_))
{
zhs.WriteEndOfCentralDirectory(0, 0, 0, theComment);
}
}
}
}
finally
{
PostUpdateCleanup();
}
}
/// <summary>
/// Finishes the stream. This will write the central directory at the
/// end of the zip 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="ZipException">
/// 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 (ZipEntry entry in entries)
{
WriteLeInt(ZipConstants.CentralHeaderSignature);
WriteLeShort(ZipConstants.VersionMadeBy);
WriteLeShort(entry.Version);
WriteLeShort(entry.Flags);
WriteLeShort((short) entry.CompressionMethod);
WriteLeInt((int) entry.DosTime);
WriteLeInt((int) entry.Crc);
if (entry.IsZip64Forced() ||
(entry.CompressedSize >= uint.MaxValue))
{
WriteLeInt(-1);
}
else
{
WriteLeInt((int) entry.CompressedSize);
}
if (entry.IsZip64Forced() ||
(entry.Size >= uint.MaxValue))
{
WriteLeInt(-1);
}
else
{
WriteLeInt((int) entry.Size);
}
byte[] name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xffff)
{
throw new ZipException("Name too long.");
}
ZipExtraData ed = new ZipExtraData(entry.ExtraData);
if (entry.CentralHeaderRequiresZip64)
{
ed.StartNewEntry();
if (entry.IsZip64Forced() ||
(entry.Size >= 0xffffffff))
{
ed.AddLeLong(entry.Size);
}
if (entry.IsZip64Forced() ||
(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) ?
ZipConstants.ConvertToArray(entry.Flags, entry.Comment) :
new byte[0];
if (entryComment.Length > 0xffff)
{
throw new ZipException("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)
{
// mark entry as directory (from nikolam.AT.perfectinfo.com)
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 += ZipConstants.CentralHeaderBaseSize + name.Length + extra.Length + entryComment.Length;
}
using (ZipHelperStream zhs = new ZipHelperStream(baseOutputStream_))
{
zhs.WriteEndOfCentralDirectory(numEntries, sizeEntries, offset, zipComment);
}
entries = null;
}
