/// <summary>
/// Starts a new Zip 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="ZipException">
/// Too many entries in the Zip file<br/>
/// Entry name is too long<br/>
/// Finish has already been called<br/>
/// </exception>
public void PutNextEntry(ZipEntry entry)
{
if ( entry == null ) {
throw new ArgumentNullException("entry");
}
if (entries == null) {
throw new InvalidOperationException("ZipOutputStream was finished");
}
if (curEntry != null) {
CloseEntry();
}
if (entries.Count == int.MaxValue) {
throw new ZipException("Too many entries for Zip 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 ( (useZip64_ == UseZip64.On) || ((entry.Size < 0) && (useZip64_ == UseZip64.Dynamic)) ) {
entry.ForceZip64();
}
// Write the local file header
WriteLeInt(ZipConstants.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.LocalHeaderRequiresZip64 ) {
WriteLeInt(-1);
WriteLeInt(-1);
}
else {
WriteLeInt(entry.IsCrypted ? (int)entry.CompressedSize + ZipConstants.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 Zip64 Extended Information
if ( entry.LocalHeaderRequiresZip64 || patchEntryHeader ) {
WriteLeInt(-1);
WriteLeInt(-1);
}
else {
WriteLeInt(0); // Compressed size
WriteLeInt(0); // Uncompressed size
}
}
byte[] name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xFFFF) {
throw new ZipException("Entry name too long.");
}
ZipExtraData ed = new ZipExtraData(entry.ExtraData);
if (entry.LocalHeaderRequiresZip64) {
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 ZipException("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.LocalHeaderRequiresZip64 && patchEntryHeader ) {
sizePatchPos += baseOutputStream_.Position;
}
if ( extra.Length > 0 ) {
baseOutputStream_.Write(extra, 0, extra.Length);
}
offset += ZipConstants.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 Zip will says its ok
WriteEncryptionHeader(entry.DosTime << 16);
} else {
WriteEncryptionHeader(entry.Crc);
}
}
}
/// <summary>
/// Gets an input stream for reading the given zip entry data in an uncompressed form.
/// Normally the <see cref="ZipEntry"/> should be an entry returned by GetEntry().
/// </summary>
/// <param name="entry">The <see cref="ZipEntry"/> to obtain a data <see cref="Stream"/> for</param>
/// <returns>An input <see cref="Stream"/> containing data for this <see cref="ZipEntry"/></returns>
/// <exception cref="ObjectDisposedException">
/// The ZipFile has already been closed
/// </exception>
/// <exception cref="PCS.IO.Compression.Zip.ZipException">
/// The compression method for the entry is unknown
/// </exception>
/// <exception cref="IndexOutOfRangeException">
/// The entry is not found in the ZipFile
/// </exception>
public Stream GetInputStream(ZipEntry entry)
{
if ( entry == null ) {
throw new ArgumentNullException("entry");
}
if ( isDisposed_ ) {
throw new ObjectDisposedException("ZipFile");
}
long index = entry.ZipFileIndex;
if ( (index < 0) || (index >= entries_.Length) || (entries_[index].Name != entry.Name) ) {
index = FindEntry(entry.Name, true);
if (index < 0) {
throw new ZipException("Entry cannot be found");
}
}
return GetInputStream(index);
}
/// <summary>
/// Complete cleanup as the final part of closing.
/// </summary>
/// <param name="testCrc">True if the crc value should be tested</param>
void CompleteCloseEntry(bool testCrc)
{
StopDecrypting();
if ((flags & 8) != 0) {
ReadDataDescriptor();
}
size = 0;
if ( testCrc &&
((crc.Value & 0xFFFFFFFFL) != entry.Crc) && (entry.Crc != -1)) {
throw new ZipException("CRC mismatch");
}
crc.Reset();
if (method == (int)CompressionMethod.Deflated) {
inf.Reset();
}
entry = null;
}
public ZipEntryEnumerator(ZipEntry[] entries)
{
array = entries;
}
/// <summary>
/// Opens a Zip file reading the given <see cref="Stream"/>.
/// </summary>
/// <param name="stream">The <see cref="Stream"/> to read archive data from.</param>
/// <exception cref="IOException">
/// An i/o error occurs
/// </exception>
/// <exception cref="ZipException">
/// The stream doesn't contain a valid zip archive.<br/>
/// </exception>
/// <exception cref="ArgumentException">
/// The <see cref="Stream">stream</see> doesnt support seeking.
/// </exception>
/// <exception cref="ArgumentNullException">
/// The <see cref="Stream">stream</see> argument is null.
/// </exception>
public ZipFile(Stream stream)
{
if ( stream == null ) {
throw new ArgumentNullException("stream");
}
if ( !stream.CanSeek ) {
throw new ArgumentException("Stream is not seekable", "stream");
}
baseStream_ = stream;
isStreamOwner = true;
if ( baseStream_.Length > 0 ) {
try {
ReadEntries();
}
catch {
DisposeInternal(true);
throw;
}
} else {
entries_ = new ZipEntry[0];
isNewArchive_ = true;
}
}
/// <summary>
/// Locate the data for a given entry.
/// </summary>
/// <returns>
/// The start offset of the data.
/// </returns>
/// <exception cref="System.IO.EndOfStreamException">
/// The stream ends prematurely
/// </exception>
/// <exception cref="PCS.IO.Compression.Zip.ZipException">
/// The local header signature is invalid, the entry and central header file name lengths are different
/// or the local and entry compression methods dont match
/// </exception>
long LocateEntry(ZipEntry entry)
{
return TestLocalHeader(entry, HeaderTest.Extract);
}
Stream CreateAndInitEncryptionStream(Stream baseStream, ZipEntry entry)
{
CryptoStream result = null;
if ( (entry.Version < ZipConstants.VersionStrongEncryption)
|| (entry.Flags & (int)GeneralBitFlags.StrongEncryption) == 0) {
PkzipClassicManaged classicManaged = new PkzipClassicManaged();
OnKeysRequired(entry.Name);
if (HaveKeys == false) {
throw new ZipException("No password available for encrypted stream");
}
// Closing a CryptoStream will close the base stream as well so wrap it in an UncompressedStream
// which doesnt do this.
result = new CryptoStream(new UncompressedStream(baseStream),
classicManaged.CreateEncryptor(key, null), CryptoStreamMode.Write);
if ( (entry.Crc < 0) || (entry.Flags & 8) != 0) {
WriteEncryptionHeader(result, entry.DosTime << 16);
}
else {
WriteEncryptionHeader(result, entry.Crc);
}
}
return result;
}
/// <summary>
/// Get an output stream for the specified <see cref="ZipEntry"/>
/// </summary>
/// <param name="entry">The entry to get an output stream for.</param>
/// <returns>The output stream obtained for the entry.</returns>
Stream GetOutputStream(ZipEntry entry)
{
Stream result = baseStream_;
if ( entry.IsCrypted == true ) {
#if NETCF_1_0
throw new ZipException("Encryption not supported for Compact Framework 1.0");
#else
result = CreateAndInitEncryptionStream(result, entry);
#endif
}
switch ( entry.CompressionMethod ) {
case CompressionMethod.Stored:
result = new UncompressedStream(result);
break;
case CompressionMethod.Deflated:
DeflaterOutputStream dos = new DeflaterOutputStream(result, new Deflater(9, true));
dos.IsStreamOwner = false;
result = dos;
break;
default:
throw new ZipException("Unknown compression method " + entry.CompressionMethod);
}
return result;
}
internal void SetEntry(ZipEntry entry)
{
entry_ = entry;
entryValid_ = true;
bytesTested_ = 0;
}
int WriteCentralDirectoryHeader(ZipEntry entry)
{
if ( entry.CompressedSize < 0 ) {
throw new ZipException("Attempt to write central directory entry with unknown csize");
}
if ( entry.Size < 0 ) {
throw new ZipException("Attempt to write central directory entry with unknown size");
}
if ( entry.Crc < 0 ) {
throw new ZipException("Attempt to write central directory entry with unknown crc");
}
// Write the central file header
WriteLEInt(ZipConstants.CentralHeaderSignature);
// Version made by
WriteLEShort(ZipConstants.VersionMadeBy);
// Version required to extract
WriteLEShort(entry.Version);
WriteLEShort(entry.Flags);
unchecked {
WriteLEShort((byte)entry.CompressionMethod);
WriteLEInt((int)entry.DosTime);
WriteLEInt((int)entry.Crc);
}
if ( (entry.IsZip64Forced()) || (entry.CompressedSize >= 0xffffffff) ) {
WriteLEInt(-1);
}
else {
WriteLEInt((int)(entry.CompressedSize & 0xffffffff));
}
if ( (entry.IsZip64Forced()) || (entry.Size >= 0xffffffff) ) {
WriteLEInt(-1);
}
else {
WriteLEInt((int)entry.Size);
}
byte[] name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
if ( name.Length > 0xFFFF ) {
throw new ZipException("Entry name is too long.");
}
WriteLEShort(name.Length);
// Central header extra data is different to local header version so regenerate.
ZipExtraData ed = new ZipExtraData(entry.ExtraData);
if ( entry.CentralHeaderRequiresZip64 ) {
ed.StartNewEntry();
if ( (entry.Size >= 0xffffffff) || (useZip64_ == UseZip64.On) )
{
ed.AddLeLong(entry.Size);
}
if ( (entry.CompressedSize >= 0xffffffff) || (useZip64_ == UseZip64.On) )
{
ed.AddLeLong(entry.CompressedSize);
}
if ( entry.Offset >= 0xffffffff ) {
ed.AddLeLong(entry.Offset);
}
// Number of disk on which this file starts isnt supported and is never written here.
ed.AddNewEntry(1);
}
else {
// Should have already be done when local header was added.
ed.Delete(1);
}
byte[] centralExtraData = ed.GetEntryData();
WriteLEShort(centralExtraData.Length);
WriteLEShort(entry.Comment != null ? entry.Comment.Length : 0);
WriteLEShort(0); // disk number
WriteLEShort(0); // internal file attributes
// External file attributes...
if ( entry.ExternalFileAttributes != -1 ) {
WriteLEInt(entry.ExternalFileAttributes);
}
else {
if ( entry.IsDirectory ) {
WriteLEUint(16);
}
else {
WriteLEUint(0);
}
}
if ( entry.Offset >= 0xffffffff ) {
WriteLEUint(0xffffffff);
}
else {
WriteLEUint((uint)(int)entry.Offset);
}
if ( name.Length > 0 ) {
baseStream_.Write(name, 0, name.Length);
}
if ( centralExtraData.Length > 0 ) {
baseStream_.Write(centralExtraData, 0, centralExtraData.Length);
}
byte[] rawComment = (entry.Comment != null) ? Encoding.ASCII.GetBytes(entry.Comment) : new byte[0];
if ( rawComment.Length > 0 ) {
baseStream_.Write(rawComment, 0, rawComment.Length);
}
return ZipConstants.CentralHeaderBaseSize + name.Length + centralExtraData.Length + rawComment.Length;
}
int FindExistingUpdate(ZipEntry entry)
{
int result = -1;
string convertedName = GetTransformedFileName(entry.Name);
if (updateIndex_.ContainsKey(convertedName)) {
result = (int)updateIndex_[convertedName];
}
/*
// This is slow like the coming of the next ice age but takes less storage and may be useful
// for CF?
for (int index = 0; index < updates_.Count; ++index)
{
ZipUpdate zu = ( ZipUpdate )updates_[index];
if ( (zu.Entry.ZipFileIndex == entry.ZipFileIndex) &&
(string.Compare(convertedName, zu.Entry.Name, true, CultureInfo.InvariantCulture) == 0) ) {
result = index;
break;
}
}
*/
return result;
}
/// <summary>
/// Delete a <see cref="ZipEntry"/> from the archive.
/// </summary>
/// <param name="entry">The entry to delete.</param>
public void Delete(ZipEntry entry)
{
if ( entry == null ) {
throw new ArgumentNullException("entry");
}
CheckUpdating();
int index = FindExistingUpdate(entry);
if ( index >= 0 ) {
contentsEdited_ = true;
updates_[index] = null;
updateCount_ -= 1;
}
else {
throw new ZipException("Cannot find entry to delete");
}
}
/// <summary>
/// Add a <see cref="ZipEntry"/> that contains no data.
/// </summary>
/// <param name="entry">The entry to add.</param>
/// <remarks>This can be used to add directories, volume labels, or empty file entries.</remarks>
public void Add(ZipEntry entry)
{
if ( entry == null ) {
throw new ArgumentNullException("entry");
}
CheckUpdating();
if ( (entry.Size != 0) || (entry.CompressedSize != 0) ) {
throw new ZipException("Entry cannot have any data");
}
AddUpdate(new ZipUpdate(UpdateCommand.Add, entry));
}
/// <summary>
/// Test a local header against that provided from the central directory
/// </summary>
/// <param name="entry">
/// The entry to test against
/// </param>
/// <param name="tests">The type of <see cref="HeaderTest">tests</see> to carry out.</param>
/// <returns>The offset of the entries data in the file</returns>
long TestLocalHeader(ZipEntry entry, HeaderTest tests)
{
lock(baseStream_)
{
bool testHeader = (tests & HeaderTest.Header) != 0;
bool testData = (tests & HeaderTest.Extract) != 0;
baseStream_.Seek(offsetOfFirstEntry + entry.Offset, SeekOrigin.Begin);
if ((int)ReadLEUint() != ZipConstants.LocalHeaderSignature) {
throw new ZipException(string.Format("Wrong local header signature @{0:X}", offsetOfFirstEntry + entry.Offset));
}
short extractVersion = ( short )ReadLEUshort();
short localFlags = ( short )ReadLEUshort();
short compressionMethod = ( short )ReadLEUshort();
short fileTime = ( short )ReadLEUshort();
short fileDate = ( short )ReadLEUshort();
uint crcValue = ReadLEUint();
long compressedSize = ReadLEUint();
long size = ReadLEUint();
int storedNameLength = ReadLEUshort();
int extraDataLength = ReadLEUshort();
byte[] nameData = new byte[storedNameLength];
StreamUtils.ReadFully(baseStream_, nameData);
byte[] extraData = new byte[extraDataLength];
StreamUtils.ReadFully(baseStream_, extraData);
ZipExtraData localExtraData = new ZipExtraData(extraData);
// Extra data / zip64 checks
if (localExtraData.Find(1))
{
// TODO Check for tag values being distinct.. Multiple zip64 tags means what?
// Zip64 extra data but 'extract version' is too low
if (extractVersion < ZipConstants.VersionZip64)
{
throw new ZipException(
string.Format("Extra data contains Zip64 information but version {0}.{1} is not high enough",
extractVersion / 10, extractVersion % 10));
}
// Zip64 extra data but size fields dont indicate its required.
if (((uint)size != uint.MaxValue) && ((uint)compressedSize != uint.MaxValue))
{
throw new ZipException("Entry sizes not correct for Zip64");
}
size = localExtraData.ReadLong();
compressedSize = localExtraData.ReadLong();
if ((localFlags & (int)GeneralBitFlags.Descriptor) != 0)
{
// These may be valid if patched later
if ( (size != -1) && (size != entry.Size)) {
throw new ZipException("Size invalid for descriptor");
}
if ((compressedSize != -1) && (compressedSize != entry.CompressedSize)) {
throw new ZipException("Compressed size invalid for descriptor");
}
}
}
else
{
// No zip64 extra data but entry requires it.
if ((extractVersion >= ZipConstants.VersionZip64) &&
(((uint)size == uint.MaxValue) || ((uint)compressedSize == uint.MaxValue)))
{
throw new ZipException("Required Zip64 extended information missing");
}
}
if ( testData ) {
if ( entry.IsFile ) {
if ( !entry.IsCompressionMethodSupported() ) {
throw new ZipException("Compression method not supported");
}
if ( (extractVersion > ZipConstants.VersionMadeBy)
|| ((extractVersion > 20) && (extractVersion < ZipConstants.VersionZip64)) ) {
throw new ZipException(string.Format("Version required to extract this entry not supported ({0})", extractVersion));
}
if ( (localFlags & ( int )(GeneralBitFlags.Patched | GeneralBitFlags.StrongEncryption | GeneralBitFlags.EnhancedCompress | GeneralBitFlags.HeaderMasked)) != 0 ) {
throw new ZipException("The library does not support the zip version required to extract this entry");
}
}
}
if (testHeader)
{
if ((extractVersion <= 63) && // Ignore later versions as we dont know about them..
(extractVersion != 10) &&
(extractVersion != 11) &&
(extractVersion != 20) &&
(extractVersion != 21) &&
(extractVersion != 25) &&
(extractVersion != 27) &&
(extractVersion != 45) &&
(extractVersion != 46) &&
(extractVersion != 50) &&
(extractVersion != 51) &&
(extractVersion != 52) &&
(extractVersion != 61) &&
(extractVersion != 62) &&
(extractVersion != 63)
)
{
throw new ZipException(string.Format("Version required to extract this entry is invalid ({0})", extractVersion));
}
// Local entry flags dont have reserved bit set on.
if ((localFlags & (int)(GeneralBitFlags.ReservedPKware4 | GeneralBitFlags.ReservedPkware14 | GeneralBitFlags.ReservedPkware15)) != 0)
{
throw new ZipException("Reserved bit flags cannot be set.");
}
// Encryption requires extract version >= 20
if (((localFlags & (int)GeneralBitFlags.Encrypted) != 0) && (extractVersion < 20))
{
throw new ZipException(string.Format("Version required to extract this entry is too low for encryption ({0})", extractVersion));
}
// Strong encryption requires encryption flag to be set and extract version >= 50.
if ((localFlags & (int)GeneralBitFlags.StrongEncryption) != 0)
{
if ((localFlags & (int)GeneralBitFlags.Encrypted) == 0)
{
throw new ZipException("Strong encryption flag set but encryption flag is not set");
}
if (extractVersion < 50)
{
throw new ZipException(string.Format("Version required to extract this entry is too low for encryption ({0})", extractVersion));
}
}
// Patched entries require extract version >= 27
if (((localFlags & (int)GeneralBitFlags.Patched) != 0) && (extractVersion < 27))
{
throw new ZipException(string.Format("Patched data requires higher version than ({0})", extractVersion));
}
// Central header flags match local entry flags.
if (localFlags != entry.Flags)
{
throw new ZipException("Central header/local header flags mismatch");
}
// Central header compression method matches local entry
if (entry.CompressionMethod != (CompressionMethod)compressionMethod)
{
throw new ZipException("Central header/local header compression method mismatch");
}
if (entry.Version != extractVersion)
{
throw new ZipException("Extract version mismatch");
}
// Strong encryption and extract version match
if ((localFlags & (int)GeneralBitFlags.StrongEncryption) != 0)
{
if (extractVersion < 62)
{
throw new ZipException("Strong encryption flag set but version not high enough");
}
}
if ((localFlags & (int)GeneralBitFlags.HeaderMasked) != 0)
{
if ((fileTime != 0) || (fileDate != 0))
{
throw new ZipException("Header masked set but date/time values non-zero");
}
}
if ((localFlags & (int)GeneralBitFlags.Descriptor) == 0)
{
if (crcValue != (uint)entry.Crc)
{
throw new ZipException("Central header/local header crc mismatch");
}
}
// Crc valid for empty entry.
// This will also apply to streamed entries where size isnt known and the header cant be patched
if ((size == 0) && (compressedSize == 0))
{
if (crcValue != 0)
{
throw new ZipException("Invalid CRC for empty entry");
}
}
// TODO: make test more correct... can't compare lengths as was done originally as this can fail for MBCS strings
// Assuming a code page at this point is not valid? Best is to store the name length in the ZipEntry probably
if (entry.Name.Length > storedNameLength)
{
throw new ZipException("File name length mismatch");
}
// Name data has already been read convert it and compare.
string localName = ZipConstants.ConvertToStringExt(localFlags, nameData);
// Central directory and local entry name match
if (localName != entry.Name)
{
throw new ZipException("Central header and local header file name mismatch");
}
// Directories have zero actual size but can have compressed size
if (entry.IsDirectory)
{
if (size > 0)
{
throw new ZipException("Directory cannot have size");
}
// There may be other cases where the compressed size can be greater than this?
// If so until details are known we will be strict.
if (entry.IsCrypted)
{
if (compressedSize > ZipConstants.CryptoHeaderSize + 2)
{
throw new ZipException("Directory compressed size invalid");
}
}
else if (compressedSize > 2)
{
// When not compressed the directory size can validly be 2 bytes
// if the true size wasnt known when data was originally being written.
// NOTE: Versions of the library 0.85.4 and earlier always added 2 bytes
throw new ZipException("Directory compressed size invalid");
}
}
if (!ZipNameTransform.IsValidName(localName, true))
{
throw new ZipException("Name is invalid");
}
}
// Tests that apply to both data and header.
// Size can be verified only if it is known in the local header.
// it will always be known in the central header.
if (((localFlags & (int)GeneralBitFlags.Descriptor) == 0) ||
((size > 0) || (compressedSize > 0))) {
if (size != entry.Size) {
throw new ZipException(
string.Format("Size mismatch between central header({0}) and local header({1})",
entry.Size, size));
}
if (compressedSize != entry.CompressedSize) {
throw new ZipException(
string.Format("Compressed size mismatch between central header({0}) and local header({1})",
entry.CompressedSize, compressedSize));
}
}
int extraLength = storedNameLength + extraDataLength;
return offsetOfFirstEntry + entry.Offset + ZipConstants.LocalHeaderBaseSize + extraLength;
}
}
void DisposeInternal(bool disposing)
{
if ( !isDisposed_ ) {
isDisposed_ = true;
entries_ = new ZipEntry[0];
if ( IsStreamOwner && (baseStream_ != null) ) {
lock(baseStream_) {
baseStream_.Close();
}
}
PostUpdateCleanup();
}
}
public ZipUpdate(string fileName, ZipEntry entry)
{
command_ = UpdateCommand.Add;
entry_ = entry;
filename_ = fileName;
}
/// <summary>
/// Search for and read the central directory of a zip file filling the entries array.
/// </summary>
/// <exception cref="System.IO.IOException">
/// An i/o error occurs.
/// </exception>
/// <exception cref="PCS.IO.Compression.Zip.ZipException">
/// The central directory is malformed or cannot be found
/// </exception>
void ReadEntries()
{
// Search for the End Of Central Directory. When a zip comment is
// present the directory will start earlier
//
// The search is limited to 64K which is the maximum size of a trailing comment field to aid speed.
// This should be compatible with both SFX and ZIP files but has only been tested for Zip files
// If a SFX file has the Zip data attached as a resource and there are other resources occuring later then
// this could be invalid.
// Could also speed this up by reading memory in larger blocks.
if (baseStream_.CanSeek == false) {
throw new ZipException("ZipFile stream must be seekable");
}
long locatedEndOfCentralDir = LocateBlockWithSignature(ZipConstants.EndOfCentralDirectorySignature,
baseStream_.Length, ZipConstants.EndOfCentralRecordBaseSize, 0xffff);
if (locatedEndOfCentralDir < 0) {
throw new ZipException("Cannot find central directory");
}
// Read end of central directory record
ushort thisDiskNumber = ReadLEUshort();
ushort startCentralDirDisk = ReadLEUshort();
ulong entriesForThisDisk = ReadLEUshort();
ulong entriesForWholeCentralDir = ReadLEUshort();
ulong centralDirSize = ReadLEUint();
long offsetOfCentralDir = ReadLEUint();
uint commentSize = ReadLEUshort();
if ( commentSize > 0 ) {
byte[] comment = new byte[commentSize];
StreamUtils.ReadFully(baseStream_, comment);
comment_ = ZipConstants.ConvertToString(comment);
}
else {
comment_ = string.Empty;
}
bool isZip64 = false;
// Check if zip64 header information is required.
if ( (thisDiskNumber == 0xffff) ||
(startCentralDirDisk == 0xffff) ||
(entriesForThisDisk == 0xffff) ||
(entriesForWholeCentralDir == 0xffff) ||
(centralDirSize == 0xffffffff) ||
(offsetOfCentralDir == 0xffffffff) ) {
isZip64 = true;
long offset = LocateBlockWithSignature(ZipConstants.Zip64CentralDirLocatorSignature, locatedEndOfCentralDir, 0, 0x1000);
if ( offset < 0 ) {
throw new ZipException("Cannot find Zip64 locator");
}
// number of the disk with the start of the zip64 end of central directory 4 bytes
// relative offset of the zip64 end of central directory record 8 bytes
// total number of disks 4 bytes
ReadLEUint(); // startDisk64 is not currently used
ulong offset64 = ReadLEUlong();
uint totalDisks = ReadLEUint();
baseStream_.Position = (long)offset64;
long sig64 = ReadLEUint();
if ( sig64 != ZipConstants.Zip64CentralFileHeaderSignature ) {
throw new ZipException(string.Format("Invalid Zip64 Central directory signature at {0:X}", offset64));
}
// NOTE: Record size = SizeOfFixedFields + SizeOfVariableData - 12.
ulong recordSize = ( ulong )ReadLEUlong();
int versionMadeBy = ReadLEUshort();
int versionToExtract = ReadLEUshort();
uint thisDisk = ReadLEUint();
uint centralDirDisk = ReadLEUint();
entriesForThisDisk = ReadLEUlong();
entriesForWholeCentralDir = ReadLEUlong();
centralDirSize = ReadLEUlong();
offsetOfCentralDir = (long)ReadLEUlong();
// NOTE: zip64 extensible data sector (variable size) is ignored.
}
entries_ = new ZipEntry[entriesForThisDisk];
// SFX/embedded support, find the offset of the first entry vis the start of the stream
// This applies to Zip files that are appended to the end of an SFX stub.
// Or are appended as a resource to an executable.
// Zip files created by some archivers have the offsets altered to reflect the true offsets
// and so dont require any adjustment here...
// TODO: Difficulty with Zip64 and SFX offset handling needs resolution - maths?
if ( !isZip64 && (offsetOfCentralDir < locatedEndOfCentralDir - (4 + (long)centralDirSize)) ) {
offsetOfFirstEntry = locatedEndOfCentralDir - (4 + (long)centralDirSize + offsetOfCentralDir);
if (offsetOfFirstEntry <= 0) {
throw new ZipException("Invalid embedded zip archive");
}
}
baseStream_.Seek(offsetOfFirstEntry + offsetOfCentralDir, SeekOrigin.Begin);
for (ulong i = 0; i < entriesForThisDisk; i++) {
if (ReadLEUint() != ZipConstants.CentralHeaderSignature) {
throw new ZipException("Wrong Central Directory signature");
}
int versionMadeBy = ReadLEUshort();
int versionToExtract = ReadLEUshort();
int bitFlags = ReadLEUshort();
int method = ReadLEUshort();
uint dostime = ReadLEUint();
uint crc = ReadLEUint();
long csize = (long)ReadLEUint();
long size = (long)ReadLEUint();
int nameLen = ReadLEUshort();
int extraLen = ReadLEUshort();
int commentLen = ReadLEUshort();
int diskStartNo = ReadLEUshort(); // Not currently used
int internalAttributes = ReadLEUshort(); // Not currently used
uint externalAttributes = ReadLEUint();
long offset = ReadLEUint();
byte[] buffer = new byte[Math.Max(nameLen, commentLen)];
StreamUtils.ReadFully(baseStream_, buffer, 0, nameLen);
string name = ZipConstants.ConvertToStringExt(bitFlags, buffer, nameLen);
ZipEntry entry = new ZipEntry(name, versionToExtract, versionMadeBy, (CompressionMethod)method);
entry.Crc = crc & 0xffffffffL;
entry.Size = size & 0xffffffffL;
entry.CompressedSize = csize & 0xffffffffL;
entry.Flags = bitFlags;
entry.DosTime = (uint)dostime;
entry.ZipFileIndex = (long)i;
entry.Offset = offset;
entry.ExternalFileAttributes = (int)externalAttributes;
if ((bitFlags & 8) == 0) {
entry.CryptoCheckValue = (byte)(crc >> 24);
}
else {
entry.CryptoCheckValue = (byte)((dostime >> 8) & 0xff);
}
if (extraLen > 0) {
byte[] extra = new byte[extraLen];
StreamUtils.ReadFully(baseStream_, extra);
entry.ExtraData = extra;
}
entry.ProcessExtraData(false);
if (commentLen > 0) {
StreamUtils.ReadFully(baseStream_, buffer, 0, commentLen);
entry.Comment = ZipConstants.ConvertToStringExt(bitFlags, buffer, commentLen);
}
entries_[i] = entry;
}
}
public ZipUpdate(string fileName, string entryName, CompressionMethod compressionMethod)
{
command_ = UpdateCommand.Add;
entry_ = new ZipEntry(entryName);
entry_.CompressionMethod = compressionMethod;
filename_ = fileName;
}
Stream CreateAndInitDecryptionStream(Stream baseStream, ZipEntry entry)
{
CryptoStream result = null;
if ( (entry.Version < ZipConstants.VersionStrongEncryption)
|| (entry.Flags & (int)GeneralBitFlags.StrongEncryption) == 0) {
PkzipClassicManaged classicManaged = new PkzipClassicManaged();
OnKeysRequired(entry.Name);
if (HaveKeys == false) {
throw new ZipException("No password available for encrypted stream");
}
result = new CryptoStream(baseStream, classicManaged.CreateDecryptor(key, null), CryptoStreamMode.Read);
CheckClassicPassword(result, entry);
}
else {
throw new ZipException("Decryption method not supported");
}
return result;
}
public ZipUpdate(IStaticDataSource dataSource, string entryName, CompressionMethod compressionMethod)
{
command_ = UpdateCommand.Add;
entry_ = new ZipEntry(entryName);
entry_.CompressionMethod = compressionMethod;
dataSource_ = dataSource;
}
static void CheckClassicPassword(CryptoStream classicCryptoStream, ZipEntry entry)
{
byte[] cryptbuffer = new byte[ZipConstants.CryptoHeaderSize];
StreamUtils.ReadFully(classicCryptoStream, cryptbuffer);
if (cryptbuffer[ZipConstants.CryptoHeaderSize - 1] != entry.CryptoCheckValue) {
throw new ZipException("Invalid password");
}
}
public ZipUpdate(IStaticDataSource dataSource, ZipEntry entry)
{
command_ = UpdateCommand.Add;
entry_ = entry;
dataSource_ = dataSource;
}
/// <summary>
/// Get a <see cref="Stream"/> providing data for an entry.
/// </summary>
/// <param name="entry">The entry to provide data for.</param>
/// <param name="name">The file name for data if known.</param>
/// <returns>Returns a stream providing data; or null if not available</returns>
public Stream GetSource(ZipEntry entry, string name)
{
Stream result = null;
if ( name != null ) {
result = File.OpenRead(name);
}
return result;
}
public ZipUpdate(ZipEntry original, ZipEntry updated)
{
throw new ZipException("Modify not currently supported");
/*
command_ = UpdateCommand.Modify;
entry_ = ( ZipEntry )original.Clone();
outEntry_ = ( ZipEntry )updated.Clone();
*/
}
/// <summary>
/// Initializes a default <see cref="ZipFile"/> instance with no entries and no file storage.
/// </summary>
internal ZipFile()
{
entries_ = new ZipEntry[0];
isNewArchive_ = true;
}
public ZipUpdate(UpdateCommand command, ZipEntry entry)
{
command_ = command;
entry_ = ( ZipEntry )entry.Clone();
}
/// <summary>
/// Advances to the next entry in the archive
/// </summary>
/// <returns>
/// The next <see cref="ZipEntry">entry</see> in the archive or null if there are no more entries.
/// </returns>
/// <remarks>
/// If the previous entry is still open <see cref="CloseEntry">CloseEntry</see> is called.
/// </remarks>
/// <exception cref="InvalidOperationException">
/// Input stream is closed
/// </exception>
/// <exception cref="ZipException">
/// Password is not set, password is invalid, compression method is invalid,
/// version required to extract is not supported
/// </exception>
public ZipEntry GetNextEntry()
{
if (crc == null) {
throw new InvalidOperationException("Closed.");
}
if (entry != null) {
CloseEntry();
}
int header = inputBuffer.ReadLeInt();
if (header == ZipConstants.CentralHeaderSignature ||
header == ZipConstants.EndOfCentralDirectorySignature ||
header == ZipConstants.CentralHeaderDigitalSignature ||
header == ZipConstants.ArchiveExtraDataSignature ||
header == ZipConstants.Zip64CentralFileHeaderSignature) {
// No more individual entries exist
Close();
return null;
}
// -jr- 07-Dec-2003 Ignore spanning temporary signatures if found
// Spanning signature is same as descriptor signature and is untested as yet.
if ( (header == ZipConstants.SpanningTempSignature) || (header == ZipConstants.SpanningSignature) ) {
header = inputBuffer.ReadLeInt();
}
if (header != ZipConstants.LocalHeaderSignature) {
throw new ZipException("Wrong Local header signature: 0x" + String.Format("{0:X}", header));
}
short versionRequiredToExtract = (short)inputBuffer.ReadLeShort();
flags = inputBuffer.ReadLeShort();
method = inputBuffer.ReadLeShort();
uint dostime = (uint)inputBuffer.ReadLeInt();
int crc2 = inputBuffer.ReadLeInt();
csize = inputBuffer.ReadLeInt();
size = inputBuffer.ReadLeInt();
int nameLen = inputBuffer.ReadLeShort();
int extraLen = inputBuffer.ReadLeShort();
bool isCrypted = (flags & 1) == 1;
byte[] buffer = new byte[nameLen];
inputBuffer.ReadRawBuffer(buffer);
string name = ZipConstants.ConvertToStringExt(flags, buffer);
entry = new ZipEntry(name, versionRequiredToExtract);
entry.Flags = flags;
entry.CompressionMethod = (CompressionMethod)method;
if ((flags & 8) == 0) {
entry.Crc = crc2 & 0xFFFFFFFFL;
entry.Size = size & 0xFFFFFFFFL;
entry.CompressedSize = csize & 0xFFFFFFFFL;
entry.CryptoCheckValue = (byte)((crc2 >> 24) & 0xff);
} else {
// This allows for GNU, WinZip and possibly other archives, the PKZIP spec
// says these values are zero under these circumstances.
if (crc2 != 0) {
entry.Crc = crc2 & 0xFFFFFFFFL;
}
if (size != 0) {
entry.Size = size & 0xFFFFFFFFL;
}
if (csize != 0) {
entry.CompressedSize = csize & 0xFFFFFFFFL;
}
entry.CryptoCheckValue = (byte)((dostime >> 8) & 0xff);
}
entry.DosTime = dostime;
// If local header requires Zip64 is true then the extended header should contain
// both values.
// Handle extra data if present. This can set/alter some fields of the entry.
if (extraLen > 0) {
byte[] extra = new byte[extraLen];
inputBuffer.ReadRawBuffer(extra);
entry.ExtraData = extra;
}
entry.ProcessExtraData(true);
if ( entry.CompressedSize >= 0 ) {
csize = entry.CompressedSize;
}
if ( entry.Size >= 0 ) {
size = entry.Size;
}
if (method == (int)CompressionMethod.Stored && (!isCrypted && csize != size || (isCrypted && csize - ZipConstants.CryptoHeaderSize != size))) {
throw new ZipException("Stored, but compressed != uncompressed");
}
// Determine how to handle reading of data if this is attempted.
if (entry.IsCompressionMethodSupported()) {
internalReader = new ReadDataHandler(InitialRead);
} else {
internalReader = new ReadDataHandler(ReadingNotSupported);
}
return entry;
}
/// <summary>
/// Copy an existing entry.
/// </summary>
/// <param name="entry">The existing entry to copy.</param>
public ZipUpdate(ZipEntry entry)
: this(UpdateCommand.Copy, entry)
{
// Do nothing.
}
/// <summary>
/// Closes the zip input stream
/// </summary>
public override void Close()
{
internalReader = new ReadDataHandler(ReadingNotAvailable);
crc = null;
entry = null;
base.Close();
}
public ZipEntry(ZipEntry entry)
{
if ( entry == null ) {
throw new ArgumentNullException("entry");
}
known = entry.known;
name = entry.name;
size = entry.size;
compressedSize = entry.compressedSize;
crc = entry.crc;
dosTime = entry.dosTime;
method = entry.method;
comment = entry.comment;
versionToExtract = entry.versionToExtract;
versionMadeBy = entry.versionMadeBy;
externalFileAttributes = entry.externalFileAttributes;
flags = entry.flags;
zipFileIndex = entry.zipFileIndex;
offset = entry.offset;
forceZip64_ = entry.forceZip64_;
if ( entry.extra != null ) {
extra = new byte[entry.extra.Length];
Array.Copy(entry.extra, 0, extra, 0, entry.extra.Length);
}
}
