public ZipFileHeader(ZipFileInfo fileInfo, bool zip64)
: this()
{
this.flags = ZipFileFlags.None;
this.compressionMethod = fileInfo.CompressionMethod;
this.fileName = Path.Combine(fileInfo.Path, fileInfo.Name);
CompressionEngine.DateTimeToDosDateAndTime(
fileInfo.LastWriteTime, out this.lastModDate, out this.lastModTime);
this.zip64 = zip64;
if (this.zip64)
{
this.compressedSize = UInt32.MaxValue;
this.uncompressedSize = UInt32.MaxValue;
this.diskStart = UInt16.MaxValue;
this.versionMadeBy = 45;
this.versionNeeded = 45;
ZipExtraFileField field = new ZipExtraFileField();
field.fieldType = ZipExtraFileFieldType.ZIP64;
field.SetZip64Data(
fileInfo.CompressedLength,
fileInfo.Length,
0,
fileInfo.ArchiveNumber);
this.extraFields = new ZipExtraFileField[] { field };
}
else
{
this.compressedSize = (uint) fileInfo.CompressedLength;
this.uncompressedSize = (uint) fileInfo.Length;
this.diskStart = (ushort) fileInfo.ArchiveNumber;
}
}
internal uint Write(Stream outputStream, ZipCompressionMethod compression)
{
byte[] bytes = Encoding.UTF8.GetBytes(this.FileName);
byte[] buffer = Encoding.UTF8.GetBytes(this.Comment);
outputStream.Write(new byte[] { 80, 0x4b, 1, 2, 0x3f, 0, 10, 0 }, 0, 8);
HeaderFlags flags = HeaderFlags.UTF8;
if (!outputStream.CanSeek)
{
flags = (HeaderFlags)((ushort)(flags | HeaderFlags.UsePostDataDescriptor));
if (compression == ZipCompressionMethod.LZMA)
{
flags = (HeaderFlags)((ushort)(flags | HeaderFlags.Bit1));
}
}
outputStream.Write(BitConverter.GetBytes((ushort)flags), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort)compression), 0, 2);
outputStream.Write(BitConverter.GetBytes(Utility.DateTimeToDosTime(this.ModificationTime)), 0, 4);
outputStream.Write(BitConverter.GetBytes(this.Crc), 0, 4);
outputStream.Write(BitConverter.GetBytes(this.Compressed), 0, 4);
outputStream.Write(BitConverter.GetBytes(this.Decompressed), 0, 4);
outputStream.Write(BitConverter.GetBytes((ushort)bytes.Length), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort)0), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort)buffer.Length), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort)0), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort)0), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort)0), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort)0x8100), 0, 2);
outputStream.Write(BitConverter.GetBytes(this.HeaderOffset), 0, 4);
outputStream.Write(bytes, 0, bytes.Length);
outputStream.Write(buffer, 0, buffer.Length);
return((uint)((0x2e + bytes.Length) + buffer.Length));
}
public ZipCentralDirectoryEntry(ZipCompressionMethod compression, string fileName, ulong headerOffset, Encoding forceEncoding)
{
this.compression = compression;
this.fileName = fileName;
HeaderOffset = headerOffset;
this.forceEncoding = forceEncoding;
}
public ZipFileHeader(ZipFileInfo fileInfo, bool zip64)
: this()
{
this.flags = ZipFileFlags.None;
this.compressionMethod = fileInfo.CompressionMethod;
this.fileName = Path.Combine(fileInfo.Path, fileInfo.Name);
CompressionEngine.DateTimeToDosDateAndTime(
fileInfo.LastWriteTime, out this.lastModDate, out this.lastModTime);
this.zip64 = zip64;
if (this.zip64)
{
this.compressedSize = UInt32.MaxValue;
this.uncompressedSize = UInt32.MaxValue;
this.diskStart = UInt16.MaxValue;
this.versionMadeBy = 45;
this.versionNeeded = 45;
ZipExtraFileField field = new ZipExtraFileField();
field.fieldType = ZipExtraFileFieldType.ZIP64;
field.SetZip64Data(
fileInfo.CompressedLength,
fileInfo.Length,
0,
fileInfo.ArchiveNumber);
this.extraFields = new ZipExtraFileField[] { field };
}
else
{
this.compressedSize = (uint)fileInfo.CompressedLength;
this.uncompressedSize = (uint)fileInfo.Length;
this.diskStart = (ushort)fileInfo.ArchiveNumber;
}
}
public ZipCompressionInfo(CompressionInfo compressionInfo)
{
switch (compressionInfo.Type)
{
case CompressionType.None:
{
this.Compression = ZipCompressionMethod.None;
}
break;
case CompressionType.Deflate:
{
this.DeflateCompressionLevel = compressionInfo.DeflateCompressionLevel;
this.Compression = ZipCompressionMethod.Deflate;
}
break;
case CompressionType.BZip2:
{
this.Compression = ZipCompressionMethod.BZip2;
}
break;
case CompressionType.LZMA:
{
this.Compression = ZipCompressionMethod.LZMA;
}
break;
case CompressionType.PPMd:
{
this.Compression = ZipCompressionMethod.PPMd;
}
break;
default:
throw new InvalidFormatException("Invalid compression method: " + compressionInfo.Type);
}
}
virtual protected void ReadHeader(Stream source)
{
var reader = new BinaryReader(source);
int fileNameLength;
int extraFieldLength;
var enc = encoding437;
Version = reader.ReadInt16();
Flags = reader.ReadInt16();
Compression = (ZipCompressionMethod)reader.ReadInt16();
LastModifiedTime = reader.ReadInt16();
LastModifiedDate = reader.ReadInt16();
Crc32 = reader.ReadInt32();
CompressedSize = reader.ReadInt32();
UncompressedSize = reader.ReadInt32();
fileNameLength = reader.ReadInt16();
extraFieldLength = reader.ReadInt16();
ExtraData = new List <ZipExtraField>();
if (UseUTF8)
{
enc = encodingUTF8;
}
if (fileNameLength > 0)
{
Filename = enc.GetString(reader.ReadBytes(fileNameLength));
}
else
{
Filename = "";
}
while (extraFieldLength > 0)
{
// load extra data
int id = reader.ReadInt16();
int fieldLength = reader.ReadInt16();
ZipExtraField zef = new ZipExtraField(id, reader.ReadBytes(fieldLength));
extraFieldLength -= fieldLength + 4;
ExtraData.Add(zef);
}
foreach (var data in ExtraData)
{
using (MemoryStream dataMem = new MemoryStream(data.Data))
{
BinaryReader dataReader = new BinaryReader(dataMem);
switch (data.Id)
{
case 1: // ZIP64
UncompressedSize = dataReader.ReadInt64();
CompressedSize = dataReader.ReadInt64();
break;
}
}
}
Offset = source.Position;
}
internal ZipWritingStream(ZipWriter writer, Stream originalStream, ZipCentralDirectoryEntry entry,
ZipCompressionMethod zipCompressionMethod, CompressionLevel compressionLevel)
{
this.writer = writer;
this.originalStream = originalStream;
this.writer = writer;
this.entry = entry;
this.zipCompressionMethod = zipCompressionMethod;
this.compressionLevel = compressionLevel;
writeStream = GetWriteStream(originalStream);
}
/// <summary>
/// Creates a new ZipFileInfo object with all parameters specified,
/// used internally when reading the metadata out of a zip archive.
/// </summary>
/// <param name="filePath">The internal path and name of the file in the zip archive.</param>
/// <param name="zipNumber">The zip archive number where the file starts.</param>
/// <param name="attributes">The stored attributes of the file.</param>
/// <param name="lastWriteTime">The stored last write time of the file.</param>
/// <param name="length">The uncompressed size of the file.</param>
/// <param name="compressedLength">The compressed size of the file.</param>
/// <param name="compressionMethod">Compression algorithm used for this file.</param>
internal ZipFileInfo(
string filePath,
int zipNumber,
FileAttributes attributes,
DateTime lastWriteTime,
long length,
long compressedLength,
ZipCompressionMethod compressionMethod)
: base(filePath, zipNumber, attributes, lastWriteTime, length)
{
this.compressedLength = compressedLength;
this.compressionMethod = compressionMethod;
}
/// <summary>
/// Creates a new ZipFileInfo object with all parameters specified,
/// used internally when reading the metadata out of a zip archive.
/// </summary>
/// <param name="filePath">The internal path and name of the file in the zip archive.</param>
/// <param name="zipNumber">The zip archive number where the file starts.</param>
/// <param name="attributes">The stored attributes of the file.</param>
/// <param name="lastWriteTime">The stored last write time of the file.</param>
/// <param name="length">The uncompressed size of the file.</param>
/// <param name="compressedLength">The compressed size of the file.</param>
/// <param name="compressionMethod">Compression algorithm used for this file.</param>
internal ZipFileInfo(
string filePath,
int zipNumber,
FileAttributes attributes,
DateTime lastWriteTime,
long length,
long compressedLength,
ZipCompressionMethod compressionMethod)
: base(filePath, zipNumber, attributes, lastWriteTime, length)
{
this.compressedLength = compressedLength;
this.compressionMethod = compressionMethod;
}
/// <summary>
/// Registers a delegate that can create a warpper stream for
/// compressing or uncompressing the data of a source stream.
/// </summary>
/// <param name="compressionMethod">Compression method being registered.</param>
/// <param name="compressionMode">Indicates registration for ether
/// compress or decompress mode.</param>
/// <param name="creator">Delegate being registered.</param>
/// <remarks>
/// For compression, the delegate accepts a stream that writes to the archive
/// and returns a wrapper stream that compresses bytes as they are written.
/// For decompression, the delegate accepts a stream that reads from the archive
/// and returns a wrapper stream that decompresses bytes as they are read.
/// This wrapper stream model follows the design used by
/// System.IO.Compression.DeflateStream, and indeed that class is used
/// to implement the Deflate compression method by default.
/// <para>To unregister a delegate, call this method again and pass
/// null for the delegate parameter.</para>
/// </remarks>
/// <example>
/// When the ZipEngine class is initialized, the Deflate compression method
/// is automatically registered like this:
/// <code>
/// ZipEngine.RegisterCompressionStreamCreator(
/// ZipCompressionMethod.Deflate,
/// CompressionMode.Compress,
/// delegate(Stream stream) {
/// return new DeflateStream(stream, CompressionMode.Compress, true);
/// });
/// ZipEngine.RegisterCompressionStreamCreator(
/// ZipCompressionMethod.Deflate,
/// CompressionMode.Decompress,
/// delegate(Stream stream) {
/// return new DeflateStream(stream, CompressionMode.Decompress, true);
/// });
/// </code></example>
public static void RegisterCompressionStreamCreator(
ZipCompressionMethod compressionMethod,
CompressionMode compressionMode,
Converter <Stream, Stream> creator)
{
ZipEngine.InitCompressionStreamCreators();
if (compressionMode == CompressionMode.Compress)
{
ZipEngine.compressionStreamCreators[compressionMethod] = creator;
}
else
{
ZipEngine.decompressionStreamCreators[compressionMethod] = creator;
}
}
/// <summary>
/// Sets up this DeflateManagedStream to be used for Inflation/Decompression
/// </summary>
private void InitializeInflater(Stream stream, ZipCompressionMethod method = ZipCompressionMethod.Deflate)
{
Debug.Assert(stream != null);
Debug.Assert(method == ZipCompressionMethod.Deflate || method == ZipCompressionMethod.Deflate64);
if (!stream.CanRead)
{
throw new ArgumentException("Deflate64: input stream is not readable", nameof(stream));
}
_inflater = new InflaterManaged(method == ZipCompressionMethod.Deflate64);
_stream = stream;
_mode = CompressionMode.Decompress;
_buffer = new byte[DEFAULT_BUFFER_SIZE];
}
/// <summary>
/// Sets up this DeflateManagedStream to be used for Inflation/Decompression
/// </summary>
internal void InitializeInflater(Stream stream, bool leaveOpen, ZipCompressionMethod method = ZipCompressionMethod.Deflate)
{
Debug.Assert(stream != null);
Debug.Assert(method == ZipCompressionMethod.Deflate || method == ZipCompressionMethod.Deflate64);
if (!stream.CanRead)
{
throw new ArgumentException("Deflate64: input stream is not readable", nameof(stream));
}
_inflater = new InflaterManaged(method == ZipCompressionMethod.Deflate64);
_stream = stream;
_mode = CompressionMode.Decompress;
_leaveOpen = leaveOpen;
_buffer = new byte[DefaultBufferSize];
}
private readonly PpmdProperties ppmdProperties; // Caching properties to speed up PPMd.
#endif
public ZipWriter(Stream destination, CompressionInfo compressionInfo, string zipComment, Encoding encoding = null)
: base(ArchiveType.Zip)
{
this.zipComment = zipComment ?? string.Empty;
this.encoding = encoding ?? ArchiveEncoding.Default;
switch (compressionInfo.Type)
{
case CompressionType.None:
{
compression = ZipCompressionMethod.None;
}
break;
case CompressionType.Deflate:
{
compression = ZipCompressionMethod.Deflate;
deflateCompressionLevel = compressionInfo.DeflateCompressionLevel;
}
break;
case CompressionType.BZip2:
{
compression = ZipCompressionMethod.BZip2;
}
break;
#if LZMA
case CompressionType.LZMA:
{
compression = ZipCompressionMethod.LZMA;
}
break;
#endif
#if PPMd
case CompressionType.PPMd:
{
ppmdProperties = new PpmdProperties();
compression = ZipCompressionMethod.PPMd;
}
break;
#endif
default:
throw new InvalidFormatException("Invalid compression method: " + compressionInfo.Type);
}
InitalizeStream(destination, false);
}
// TODO: This method looks like ZipWriter.WriteHeader. Ideally the logic
// has to be extracted into a common method and be called from both places
// or better refactoring has to be done to keep the header info in a separate
// class and use it in the reader and writer.
public uint Write(Stream outputStream, ZipCompressionMethod compression)
{
byte[] encodedFilename = Encoding.UTF8.GetBytes(FileName);
byte[] encodedComment = Encoding.UTF8.GetBytes(Comment);
//constant sig, then version made by, compabitility, then version to extract
outputStream.Write(new byte[] { 80, 75, 1, 2, 0x14, 0, 0x0A, 0 }, 0, 8);
HeaderFlags flags = HeaderFlags.UTF8;
if (IsEncrypted)
{
flags |= HeaderFlags.Encrypted;
}
if (!outputStream.CanSeek)
{
flags |= HeaderFlags.UsePostDataDescriptor;
if (compression == ZipCompressionMethod.LZMA)
{
flags |= HeaderFlags.Bit1; // eos marker
}
}
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)flags), 0, 2);
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)compression), 0, 2); // zipping method
outputStream.Write(DataConverter.LittleEndian.GetBytes(ModificationTime.DateTimeToDosTime()), 0, 4);
// zipping date and time
outputStream.Write(DataConverter.LittleEndian.GetBytes(Crc), 0, 4); // file CRC
outputStream.Write(DataConverter.LittleEndian.GetBytes(Compressed), 0, 4); // compressed file size
outputStream.Write(DataConverter.LittleEndian.GetBytes(Decompressed), 0, 4); // uncompressed file size
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)encodedFilename.Length), 0, 2); // Filename in zip
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0), 0, 2); // extra length
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)encodedComment.Length), 0, 2);
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0), 0, 2); // disk=0
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0), 0, 2); // file type: binary
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0), 0, 2); // Internal file attributes
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0x8100), 0, 2);
// External file attributes (normal/readable)
outputStream.Write(DataConverter.LittleEndian.GetBytes(HeaderOffset), 0, 4); // Offset of header
outputStream.Write(encodedFilename, 0, encodedFilename.Length);
outputStream.Write(encodedComment, 0, encodedComment.Length);
return((uint)(8 + 2 + 2 + 4 + 4 + 4 + 4 + 2 + 2 + 2
+ 2 + 2 + 2 + 2 + 4 + encodedFilename.Length + encodedComment.Length));
}
private readonly PpmdProperties ppmdProperties; // Caching properties to speed up PPMd.
#endif
public ZipWriter(Stream destination, CompressionInfo compressionInfo, string zipComment, Encoding encoding = null)
: base(ArchiveType.Zip)
{
this.zipComment = zipComment ?? string.Empty;
this.encoding = encoding ?? ArchiveEncoding.Default;
switch (compressionInfo.Type)
{
case CompressionType.None:
{
compression = ZipCompressionMethod.None;
}
break;
case CompressionType.Deflate:
{
compression = ZipCompressionMethod.Deflate;
deflateCompressionLevel = compressionInfo.DeflateCompressionLevel;
}
break;
case CompressionType.BZip2:
{
compression = ZipCompressionMethod.BZip2;
}
break;
#if LZMA
case CompressionType.LZMA:
{
compression = ZipCompressionMethod.LZMA;
}
break;
#endif
#if PPMd
case CompressionType.PPMd:
{
ppmdProperties = new PpmdProperties();
compression = ZipCompressionMethod.PPMd;
}
break;
#endif
default:
throw new InvalidFormatException("Invalid compression method: " + compressionInfo.Type);
}
InitalizeStream(destination, false);
}
/// <summary>
/// Creates a central file header from the information in a local file header.
/// </summary>
/// <param name="localFileHeader">Local file header to </param>
public ZipFileHeader(ZipFileHeader localFileHeader)
{
if (localFileHeader.central)
{
throw new ArgumentException();
}
this.central = true;
this.compressionMethod = localFileHeader.compressionMethod;
this.fileName = localFileHeader.fileName;
this.fileComment = localFileHeader.fileComment;
this.flags = localFileHeader.flags;
this.externalFileAttrs = localFileHeader.externalFileAttrs;
this.internalFileAttrs = localFileHeader.internalFileAttrs;
this.lastModDate = localFileHeader.lastModDate;
this.lastModTime = localFileHeader.lastModTime;
this.crc32 = localFileHeader.crc32;
if (this.zip64)
{
this.versionMadeBy = 45;
this.versionNeeded = 45;
this.compressedSize = UInt32.MaxValue;
this.uncompressedSize = UInt32.MaxValue;
this.diskStart = UInt16.MaxValue;
ZipExtraFileField field = new ZipExtraFileField();
field.fieldType = ZipExtraFileFieldType.ZIP64;
field.SetZip64Data(localFileHeader.compressedSize, localFileHeader.uncompressedSize, localFileHeader.localHeaderOffset, localFileHeader.diskStart);
this.extraFields = new ZipExtraFileField[] { field };
}
else
{
this.versionMadeBy = 20;
this.versionNeeded = 20;
this.localHeaderOffset = localFileHeader.localHeaderOffset;
this.compressedSize = localFileHeader.compressedSize;
this.uncompressedSize = localFileHeader.uncompressedSize;
}
}
internal uint Write(Stream outputStream, ZipCompressionMethod compression)
{
byte[] encodedFilename = Encoding.UTF8.GetBytes(FileName);
byte[] encodedComment = Encoding.UTF8.GetBytes(Comment);
//constant sig, then version made by, compabitility, then version to extract
outputStream.Write(new byte[] {80, 75, 1, 2, 0x14, 0, 0x0A, 0}, 0, 8);
HeaderFlags flags = HeaderFlags.UTF8;
if (!outputStream.CanSeek)
{
flags |= HeaderFlags.UsePostDataDescriptor;
if (compression == ZipCompressionMethod.LZMA)
{
flags |= HeaderFlags.Bit1; // eos marker
}
}
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) flags), 0, 2);
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) compression), 0, 2); // zipping method
outputStream.Write(DataConverter.LittleEndian.GetBytes(ModificationTime.DateTimeToDosTime()), 0, 4);
// zipping date and time
outputStream.Write(DataConverter.LittleEndian.GetBytes(Crc), 0, 4); // file CRC
outputStream.Write(DataConverter.LittleEndian.GetBytes(Compressed), 0, 4); // compressed file size
outputStream.Write(DataConverter.LittleEndian.GetBytes(Decompressed), 0, 4); // uncompressed file size
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) encodedFilename.Length), 0, 2); // Filename in zip
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) 0), 0, 2); // extra length
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) encodedComment.Length), 0, 2);
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) 0), 0, 2); // disk=0
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) 0), 0, 2); // file type: binary
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) 0), 0, 2); // Internal file attributes
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort) 0x8100), 0, 2);
// External file attributes (normal/readable)
outputStream.Write(DataConverter.LittleEndian.GetBytes(HeaderOffset), 0, 4); // Offset of header
outputStream.Write(encodedFilename, 0, encodedFilename.Length);
outputStream.Write(encodedComment, 0, encodedComment.Length);
return (uint) (8 + 2 + 2 + 4 + 4 + 4 + 4 + 2 + 2 + 2
+ 2 + 2 + 2 + 2 + 4 + encodedFilename.Length + encodedComment.Length);
}
public ZipCompressionInfo(CompressionInfo compressionInfo)
{
switch (compressionInfo.Type)
{
case CompressionType.None:
{
this.Compression = ZipCompressionMethod.None;
}
break;
case CompressionType.Deflate:
{
this.DeflateCompressionLevel = compressionInfo.DeflateCompressionLevel;
this.Compression = ZipCompressionMethod.Deflate;
}
break;
case CompressionType.BZip2:
{
this.Compression = ZipCompressionMethod.BZip2;
}
break;
case CompressionType.LZMA:
{
this.Compression = ZipCompressionMethod.LZMA;
}
break;
case CompressionType.PPMd:
{
this.Compression = ZipCompressionMethod.PPMd;
}
break;
default:
throw new InvalidFormatException("Invalid compression method: " + compressionInfo.Type);
}
}
public bool Read(Stream stream, bool central)
{
long startPos = stream.Position;
if (stream.Length - startPos <
(central ? CFH_FIXEDSIZE : LFH_FIXEDSIZE))
{
return false;
}
BinaryReader reader = new BinaryReader(stream);
uint sig = reader.ReadUInt32();
if (sig == SPANSIG || sig == SPANSIG2)
{
// Spanned zip files may optionally begin with a special marker.
// Just ignore it and move on.
sig = reader.ReadUInt32();
}
if (sig != (central ? CFHSIG : LFHSIG))
{
return false;
}
this.versionMadeBy = (central ? reader.ReadUInt16() : (ushort) 0);
this.versionNeeded = reader.ReadUInt16();
this.flags = (ZipFileFlags) reader.ReadUInt16();
this.compressionMethod = (ZipCompressionMethod) reader.ReadUInt16();
this.lastModTime = reader.ReadInt16();
this.lastModDate = reader.ReadInt16();
this.crc32 = reader.ReadUInt32();
this.compressedSize = reader.ReadUInt32();
this.uncompressedSize = reader.ReadUInt32();
this.zip64 = this.uncompressedSize == UInt32.MaxValue;
int fileNameLength = reader.ReadUInt16();
int extraFieldLength = reader.ReadUInt16();
int fileCommentLength;
if (central)
{
fileCommentLength = reader.ReadUInt16();
this.diskStart = reader.ReadUInt16();
this.internalFileAttrs = reader.ReadUInt16();
this.externalFileAttrs = reader.ReadUInt32();
this.localHeaderOffset = reader.ReadUInt32();
}
else
{
fileCommentLength = 0;
this.diskStart = 0;
this.internalFileAttrs = 0;
this.externalFileAttrs = 0;
this.localHeaderOffset = 0;
}
if (stream.Length - stream.Position <
fileNameLength + extraFieldLength + fileCommentLength)
{
return false;
}
Encoding headerEncoding = ((this.flags | ZipFileFlags.UTF8) != 0 ?
Encoding.UTF8 : Encoding.GetEncoding(CultureInfo.CurrentCulture.TextInfo.OEMCodePage));
byte[] fileNameBytes = reader.ReadBytes(fileNameLength);
this.fileName = headerEncoding.GetString(fileNameBytes).Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar);
List<ZipExtraFileField> fields = new List<ZipExtraFileField>();
while (extraFieldLength > 0)
{
ZipExtraFileField field = new ZipExtraFileField();
if (!field.Read(stream, ref extraFieldLength))
{
return false;
}
fields.Add(field);
if (field.fieldType == ZipExtraFileFieldType.ZIP64)
{
this.zip64 = true;
}
}
this.extraFields = fields.ToArray();
byte[] fileCommentBytes = reader.ReadBytes(fileCommentLength);
this.fileComment = headerEncoding.GetString(fileCommentBytes);
return true;
}
internal uint Write(Stream outputStream, ZipCompressionMethod compression)
{
byte[] encodedFilename = Encoding.UTF8.GetBytes(FileName);
byte[] encodedComment = Encoding.UTF8.GetBytes(Comment);
var zip64_stream = Compressed >= uint.MaxValue || Decompressed >= uint.MaxValue;
var zip64 = zip64_stream || HeaderOffset >= uint.MaxValue || Zip64HeaderOffset != 0;
var compressedvalue = zip64 ? uint.MaxValue : (uint)Compressed;
var decompressedvalue = zip64 ? uint.MaxValue : (uint)Decompressed;
var headeroffsetvalue = zip64 ? uint.MaxValue : (uint)HeaderOffset;
var extralength = zip64 ? (2 + 2 + 8 + 8 + 8 + 4) : 0;
var version = (byte)(zip64 ? 45 : 10);
HeaderFlags flags = HeaderFlags.UTF8;
if (!outputStream.CanSeek)
{
// Cannot use data descriptors with zip64:
// https://blogs.oracle.com/xuemingshen/entry/is_zipinput_outputstream_handling_of
// We check that streams are not written too large in the ZipWritingStream,
// so this extra guard is not required, but kept to simplify changing the code
// once the zip64 post-data issue is resolved
if (!zip64_stream)
{
flags |= HeaderFlags.UsePostDataDescriptor;
}
if (compression == ZipCompressionMethod.LZMA)
{
flags |= HeaderFlags.Bit1; // eos marker
}
}
//constant sig, then version made by, compabitility, then version to extract
outputStream.Write(new byte[] { 80, 75, 1, 2, 0x14, 0, version, 0 }, 0, 8);
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)flags), 0, 2);
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)compression), 0, 2); // zipping method
outputStream.Write(DataConverter.LittleEndian.GetBytes(ModificationTime.DateTimeToDosTime()), 0, 4);
// zipping date and time
outputStream.Write(DataConverter.LittleEndian.GetBytes(Crc), 0, 4); // file CRC
outputStream.Write(DataConverter.LittleEndian.GetBytes(compressedvalue), 0, 4); // compressed file size
outputStream.Write(DataConverter.LittleEndian.GetBytes(decompressedvalue), 0, 4); // uncompressed file size
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)encodedFilename.Length), 0, 2); // Filename in zip
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)extralength), 0, 2); // extra length
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)encodedComment.Length), 0, 2);
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0), 0, 2); // disk=0
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0), 0, 2); // file type: binary
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0), 0, 2); // Internal file attributes
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0x8100), 0, 2);
// External file attributes (normal/readable)
outputStream.Write(DataConverter.LittleEndian.GetBytes(headeroffsetvalue), 0, 4); // Offset of header
outputStream.Write(encodedFilename, 0, encodedFilename.Length);
if (zip64)
{
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)0x0001), 0, 2);
outputStream.Write(DataConverter.LittleEndian.GetBytes((ushort)(extralength - 4)), 0, 2);
outputStream.Write(DataConverter.LittleEndian.GetBytes(Decompressed), 0, 8);
outputStream.Write(DataConverter.LittleEndian.GetBytes(Compressed), 0, 8);
outputStream.Write(DataConverter.LittleEndian.GetBytes(HeaderOffset), 0, 8);
outputStream.Write(DataConverter.LittleEndian.GetBytes(0), 0, 4); // VolumeNumber = 0
}
outputStream.Write(encodedComment, 0, encodedComment.Length);
return((uint)(8 + 2 + 2 + 4 + 4 + 4 + 4 + 2 + 2 + 2
+ 2 + 2 + 2 + 2 + 4 + encodedFilename.Length + extralength + encodedComment.Length));
}
public bool Read(Stream stream, bool central)
{
long startPos = stream.Position;
if (stream.Length - startPos <
(central ? CFH_FIXEDSIZE : LFH_FIXEDSIZE))
{
return(false);
}
BinaryReader reader = new BinaryReader(stream);
uint sig = reader.ReadUInt32();
if (sig == SPANSIG || sig == SPANSIG2)
{
// Spanned zip files may optionally begin with a special marker.
// Just ignore it and move on.
sig = reader.ReadUInt32();
}
if (sig != (central ? CFHSIG : LFHSIG))
{
return(false);
}
this.versionMadeBy = (central ? reader.ReadUInt16() : (ushort)0);
this.versionNeeded = reader.ReadUInt16();
this.flags = (ZipFileFlags)reader.ReadUInt16();
this.compressionMethod = (ZipCompressionMethod)reader.ReadUInt16();
this.lastModTime = reader.ReadInt16();
this.lastModDate = reader.ReadInt16();
this.crc32 = reader.ReadUInt32();
this.compressedSize = reader.ReadUInt32();
this.uncompressedSize = reader.ReadUInt32();
this.zip64 = this.uncompressedSize == UInt32.MaxValue;
int fileNameLength = reader.ReadUInt16();
int extraFieldLength = reader.ReadUInt16();
int fileCommentLength;
if (central)
{
fileCommentLength = reader.ReadUInt16();
this.diskStart = reader.ReadUInt16();
this.internalFileAttrs = reader.ReadUInt16();
this.externalFileAttrs = reader.ReadUInt32();
this.localHeaderOffset = reader.ReadUInt32();
}
else
{
fileCommentLength = 0;
this.diskStart = 0;
this.internalFileAttrs = 0;
this.externalFileAttrs = 0;
this.localHeaderOffset = 0;
}
if (stream.Length - stream.Position <
fileNameLength + extraFieldLength + fileCommentLength)
{
return(false);
}
#if CORECLR
Encoding headerEncoding = Encoding.UTF8;
#else
Encoding headerEncoding = ((this.flags | ZipFileFlags.UTF8) != 0 ?
Encoding.UTF8 : Encoding.GetEncoding(CultureInfo.CurrentCulture.TextInfo.OEMCodePage));
#endif
byte[] fileNameBytes = reader.ReadBytes(fileNameLength);
this.fileName = headerEncoding.GetString(fileNameBytes).Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar);
List <ZipExtraFileField> fields = new List <ZipExtraFileField>();
while (extraFieldLength > 0)
{
ZipExtraFileField field = new ZipExtraFileField();
if (!field.Read(stream, ref extraFieldLength))
{
return(false);
}
fields.Add(field);
if (field.fieldType == ZipExtraFileFieldType.ZIP64)
{
this.zip64 = true;
}
}
this.extraFields = fields.ToArray();
byte[] fileCommentBytes = reader.ReadBytes(fileCommentLength);
this.fileComment = headerEncoding.GetString(fileCommentBytes);
return(true);
}
/// <summary>
/// Adds one file to a zip archive in the process of being created.
/// </summary>
private ZipFileHeader PackOneFile(
IPackStreamContext streamContext,
string file,
long maxArchiveSize,
bool forceZip64,
ref Stream archiveStream)
{
Stream fileStream = null;
int headerArchiveNumber = 0;
try
{
// TODO: call GetOption to get compression method for the specific file
ZipCompressionMethod compressionMethod = ZipCompressionMethod.Deflate;
if (this.CompressionLevel == CompressionLevel.None)
{
compressionMethod = ZipCompressionMethod.Store;
}
Func <Stream, Stream> compressionStreamCreator;
if (!ZipEngine.compressionStreamCreators.TryGetValue(
compressionMethod, out compressionStreamCreator))
{
return(null);
}
FileAttributes attributes;
DateTime lastWriteTime;
fileStream = streamContext.OpenFileReadStream(
file, out attributes, out lastWriteTime);
if (fileStream == null)
{
return(null);
}
this.currentFileName = file;
this.currentFileNumber++;
this.currentFileTotalBytes = fileStream.Length;
this.currentFileBytesProcessed = 0;
this.OnProgress(ArchiveProgressType.StartFile);
ZipFileInfo fileInfo = new ZipFileInfo(
file,
this.currentArchiveNumber,
attributes,
lastWriteTime,
fileStream.Length,
0,
compressionMethod);
bool zip64 = forceZip64 || fileStream.Length >= (long)UInt32.MaxValue;
ZipFileHeader fileHeader = new ZipFileHeader(fileInfo, zip64);
this.CheckArchiveWriteStream(
streamContext,
maxArchiveSize,
fileHeader.GetSize(false),
ref archiveStream);
long headerPosition = archiveStream.Position;
fileHeader.Write(archiveStream, false);
headerArchiveNumber = this.currentArchiveNumber;
uint crc;
long bytesWritten = this.PackFileBytes(
streamContext,
fileStream,
maxArchiveSize,
compressionStreamCreator,
ref archiveStream,
out crc);
fileHeader.Update(
bytesWritten,
fileStream.Length,
crc,
headerPosition,
headerArchiveNumber);
streamContext.CloseFileReadStream(file, fileStream);
fileStream = null;
// Go back and rewrite the updated file header.
if (this.currentArchiveNumber == headerArchiveNumber)
{
long fileEndPosition = archiveStream.Position;
archiveStream.Seek(headerPosition, SeekOrigin.Begin);
fileHeader.Write(archiveStream, false);
archiveStream.Seek(fileEndPosition, SeekOrigin.Begin);
}
else
{
// The file spanned archives, so temporarily reopen
// the archive where it started.
string headerArchiveName = streamContext.GetArchiveName(
headerArchiveNumber + 1);
Stream headerStream = null;
try
{
headerStream = streamContext.OpenArchiveWriteStream(
headerArchiveNumber, headerArchiveName, false, this);
headerStream.Seek(headerPosition, SeekOrigin.Begin);
fileHeader.Write(headerStream, false);
}
finally
{
if (headerStream != null)
{
streamContext.CloseArchiveWriteStream(
headerArchiveNumber, headerArchiveName, headerStream);
}
}
}
this.OnProgress(ArchiveProgressType.FinishFile);
return(fileHeader);
}
finally
{
if (fileStream != null)
{
streamContext.CloseFileReadStream(
this.currentFileName, fileStream);
}
}
}
protected Stream CreateDecompressionStream(Stream stream, ZipCompressionMethod method)
{
switch (method)
{
case ZipCompressionMethod.None:
{
return(stream);
}
case ZipCompressionMethod.Deflate:
{
return(new DeflateStream(stream, CompressionMode.Decompress));
}
case ZipCompressionMethod.BZip2:
{
return(new BZip2Stream(stream, CompressionMode.Decompress));
}
case ZipCompressionMethod.LZMA:
{
if (FlagUtility.HasFlag(Header.Flags, HeaderFlags.Encrypted))
{
throw new NotSupportedException("LZMA with pkware encryption.");
}
var reader = new BinaryReader(stream);
reader.ReadUInt16(); //LZMA version
var props = new byte[reader.ReadUInt16()];
reader.Read(props, 0, props.Length);
return(new LzmaStream(props, stream,
Header.CompressedSize > 0 ? Header.CompressedSize - 4 - props.Length : -1,
FlagUtility.HasFlag(Header.Flags, HeaderFlags.Bit1)
? -1
: (long)Header.UncompressedSize));
}
case ZipCompressionMethod.PPMd:
{
var props = new byte[2];
stream.ReadFully(props);
return(new PpmdStream(new PpmdProperties(props), stream, false));
}
case ZipCompressionMethod.WinzipAes:
{
ExtraData data = Header.Extra.Where(x => x.Type == ExtraDataType.WinZipAes).SingleOrDefault();
if (data == null)
{
throw new InvalidFormatException("No Winzip AES extra data found.");
}
if (data.Length != 7)
{
throw new InvalidFormatException("Winzip data length is not 7.");
}
ushort compressedMethod = DataConverter.LittleEndian.GetUInt16(data.DataBytes, 0);
if (compressedMethod != 0x01 && compressedMethod != 0x02)
{
throw new InvalidFormatException("Unexpected vendor version number for WinZip AES metadata");
}
ushort vendorId = DataConverter.LittleEndian.GetUInt16(data.DataBytes, 2);
if (vendorId != 0x4541)
{
throw new InvalidFormatException("Unexpected vendor ID for WinZip AES metadata");
}
return(CreateDecompressionStream(stream, (ZipCompressionMethod)DataConverter.LittleEndian.GetUInt16(data.DataBytes, 5)));
}
default:
{
throw new NotSupportedException("CompressionMethod: " + Header.CompressionMethod);
}
}
}
/// <summary>
/// Registers a delegate that can create a warpper stream for
/// compressing or uncompressing the data of a source stream.
/// </summary>
/// <param name="compressionMethod">Compression method being registered.</param>
/// <param name="compressionMode">Indicates registration for ether
/// compress or decompress mode.</param>
/// <param name="creator">Delegate being registered.</param>
/// <remarks>
/// For compression, the delegate accepts a stream that writes to the archive
/// and returns a wrapper stream that compresses bytes as they are written.
/// For decompression, the delegate accepts a stream that reads from the archive
/// and returns a wrapper stream that decompresses bytes as they are read.
/// This wrapper stream model follows the design used by
/// System.IO.Compression.DeflateStream, and indeed that class is used
/// to implement the Deflate compression method by default.
/// <para>To unregister a delegate, call this method again and pass
/// null for the delegate parameter.</para>
/// </remarks>
/// <example>
/// When the ZipEngine class is initialized, the Deflate compression method
/// is automatically registered like this:
/// <code>
/// ZipEngine.RegisterCompressionStreamCreator(
/// ZipCompressionMethod.Deflate,
/// CompressionMode.Compress,
/// delegate(Stream stream) {
/// return new DeflateStream(stream, CompressionMode.Compress, true);
/// });
/// ZipEngine.RegisterCompressionStreamCreator(
/// ZipCompressionMethod.Deflate,
/// CompressionMode.Decompress,
/// delegate(Stream stream) {
/// return new DeflateStream(stream, CompressionMode.Decompress, true);
/// });
/// </code></example>
public static void RegisterCompressionStreamCreator(
ZipCompressionMethod compressionMethod,
CompressionMode compressionMode,
Converter<Stream, Stream> creator)
{
ZipEngine.InitCompressionStreamCreators();
if (compressionMode == CompressionMode.Compress)
{
ZipEngine.compressionStreamCreators[compressionMethod] = creator;
}
else
{
ZipEngine.decompressionStreamCreators[compressionMethod] = creator;
}
}
internal uint Write(Stream outputStream, ZipCompressionMethod compression)
{
byte[] bytes = Encoding.UTF8.GetBytes(this.FileName);
byte[] buffer = Encoding.UTF8.GetBytes(this.Comment);
outputStream.Write(new byte[] { 80, 0x4b, 1, 2, 0x3f, 0, 10, 0 }, 0, 8);
HeaderFlags flags = HeaderFlags.UTF8;
if (!outputStream.CanSeek)
{
flags = (HeaderFlags) ((ushort) (flags | HeaderFlags.UsePostDataDescriptor));
if (compression == ZipCompressionMethod.LZMA)
{
flags = (HeaderFlags) ((ushort) (flags | HeaderFlags.Bit1));
}
}
outputStream.Write(BitConverter.GetBytes((ushort) flags), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort) compression), 0, 2);
outputStream.Write(BitConverter.GetBytes(Utility.DateTimeToDosTime(this.ModificationTime)), 0, 4);
outputStream.Write(BitConverter.GetBytes(this.Crc), 0, 4);
outputStream.Write(BitConverter.GetBytes(this.Compressed), 0, 4);
outputStream.Write(BitConverter.GetBytes(this.Decompressed), 0, 4);
outputStream.Write(BitConverter.GetBytes((ushort) bytes.Length), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort) buffer.Length), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2);
outputStream.Write(BitConverter.GetBytes((ushort) 0x8100), 0, 2);
outputStream.Write(BitConverter.GetBytes(this.HeaderOffset), 0, 4);
outputStream.Write(bytes, 0, bytes.Length);
outputStream.Write(buffer, 0, buffer.Length);
return (uint) ((0x2e + bytes.Length) + buffer.Length);
}
