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);
}
var 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.
var 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);
}
var 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);
}
var 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;
}
void WriteLocalEntryHeader(ZipUpdate update)
{
var entry = update.OutEntry;
// TODO: Local offset will require adjusting for multi-disk zip files.
entry.Offset = baseStream_.Position;
// TODO: Need to clear any entry flags that dont make sense or throw an exception here.
if (update.Command != UpdateCommand.Copy) {
if (entry.CompressionMethod == CompressionMethod.Deflated) {
if (entry.Size == 0) {
// No need to compress - no data.
entry.CompressedSize = entry.Size;
entry.Crc = 0;
entry.CompressionMethod = CompressionMethod.Stored;
}
}
else if (entry.CompressionMethod == CompressionMethod.Stored) {
entry.Flags &= ~(int)GeneralBitFlags.Descriptor;
}
if (HaveKeys) {
entry.IsCrypted = true;
if (entry.Crc < 0) {
entry.Flags |= (int)GeneralBitFlags.Descriptor;
}
}
else {
entry.IsCrypted = false;
}
switch (useZip64_) {
case UseZip64.Dynamic:
if (entry.Size < 0) {
entry.ForceZip64();
}
break;
case UseZip64.On:
entry.ForceZip64();
break;
case UseZip64.Off:
// Do nothing. The entry itself may be using Zip64 independantly.
break;
}
}
// Write the local file header
WriteLEInt(ZipConstants.LocalHeaderSignature);
WriteLEShort(entry.Version);
WriteLEShort(entry.Flags);
WriteLEShort((byte)entry.CompressionMethod);
WriteLEInt(( int )entry.DosTime);
if ( !entry.HasCrc ) {
// Note patch address for updating CRC later.
update.CrcPatchOffset = baseStream_.Position;
WriteLEInt(0);
}
else {
WriteLEInt(unchecked(( int )entry.Crc));
}
if (entry.LocalHeaderRequiresZip64) {
WriteLEInt(-1);
WriteLEInt(-1);
}
else {
if ( (entry.CompressedSize < 0) || (entry.Size < 0) ) {
update.SizePatchOffset = baseStream_.Position;
}
WriteLEInt(( int )entry.CompressedSize);
WriteLEInt(( int )entry.Size);
}
var name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
if ( name.Length > 0xFFFF ) {
throw new ZipException("Entry name too long.");
}
var ed = new ZipExtraData(entry.ExtraData);
if ( entry.LocalHeaderRequiresZip64 ) {
ed.StartNewEntry();
// Local entry header always includes size and compressed size.
// NOTE the order of these fields is reversed when compared to the normal headers!
ed.AddLeLong(entry.Size);
ed.AddLeLong(entry.CompressedSize);
ed.AddNewEntry(1);
}
else {
ed.Delete(1);
}
entry.ExtraData = ed.GetEntryData();
WriteLEShort(name.Length);
WriteLEShort(entry.ExtraData.Length);
if ( name.Length > 0 ) {
baseStream_.Write(name, 0, name.Length);
}
if ( entry.LocalHeaderRequiresZip64 ) {
if ( !ed.Find(1) ) {
throw new ZipException("Internal error cannot find extra data");
}
update.SizePatchOffset = baseStream_.Position + ed.CurrentReadIndex;
}
if ( entry.ExtraData.Length > 0 ) {
baseStream_.Write(entry.ExtraData, 0, entry.ExtraData.Length);
}
}
// Write the local file header
// TODO: ZipHelperStream.WriteLocalHeader is not yet used and needs checking for ZipFile and ZipOuptutStream usage
void WriteLocalHeader(ZipEntry entry, EntryPatchData patchData)
{
var method = entry.CompressionMethod;
var headerInfoAvailable = true; // How to get this?
var patchEntryHeader = false;
WriteLEInt(ZipConstants.LocalHeaderSignature);
WriteLEShort(entry.Version);
WriteLEShort(entry.Flags);
WriteLEShort((byte)method);
WriteLEInt((int)entry.DosTime);
if (headerInfoAvailable) {
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 (patchData != null) {
patchData.CrcPatchOffset = stream_.Position;
}
WriteLEInt(0); // Crc
if ( patchData != null ) {
patchData.SizePatchOffset = stream_.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
}
}
var name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xFFFF) {
throw new ZipException("Entry name too long.");
}
var ed = new ZipExtraData(entry.ExtraData);
if (entry.LocalHeaderRequiresZip64 && (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 ZipException("Internal error cant find extra data");
}
if ( patchData != null ) {
patchData.SizePatchOffset = ed.CurrentReadIndex;
}
}
else {
ed.Delete(1);
}
var extra = ed.GetEntryData();
WriteLEShort(name.Length);
WriteLEShort(extra.Length);
if ( name.Length > 0 ) {
stream_.Write(name, 0, name.Length);
}
if ( entry.LocalHeaderRequiresZip64 && patchEntryHeader ) {
patchData.SizePatchOffset += stream_.Position;
}
if ( extra.Length > 0 ) {
stream_.Write(extra, 0, extra.Length);
}
}
/// <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.CompressionMethodForHeader);
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);
}
var name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xffff) {
throw new ZipException("Name too long.");
}
var 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);
}
#if !NET_1_1 && !NETCF_2_0
if (entry.AESKeySize > 0) {
AddExtraDataAES(entry, ed);
}
#endif
var extra = ed.GetEntryData();
var 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 ( var zhs = new ZipHelperStream(baseOutputStream_) ) {
zhs.WriteEndOfCentralDirectory(numEntries, sizeEntries, offset, zipComment);
}
entries = null;
}
private static void AddExtraDataAES(ZipEntry entry, ZipExtraData extraData) {
// Vendor Version: AE-1 IS 1. AE-2 is 2. With AE-2 no CRC is required and 0 is stored.
const int VENDOR_VERSION = 2;
// Vendor ID is the two ASCII characters "AE".
const int VENDOR_ID = 0x4541; //not 6965;
extraData.StartNewEntry();
// Pack AES extra data field see http://www.winzip.com/aes_info.htm
//extraData.AddLeShort(7); // Data size (currently 7)
extraData.AddLeShort(VENDOR_VERSION); // 2 = AE-2
extraData.AddLeShort(VENDOR_ID); // "AE"
extraData.AddData(entry.AESEncryptionStrength); // 1 = 128, 2 = 192, 3 = 256
extraData.AddLeShort((int)entry.CompressionMethod); // The actual compression method used to compress the file
extraData.AddNewEntry(0x9901);
}
/// <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");
}
var method = entry.CompressionMethod;
var 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 = 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)entry.CompressionMethodForHeader);
WriteLeInt((int)entry.DosTime);
// TODO: Refactor header writing. Its done in several places.
if (headerInfoAvailable) {
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) {
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
}
}
var name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xFFFF) {
throw new ZipException("Entry name too long.");
}
var 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);
}
#if !NET_1_1 && !NETCF_2_0
if (entry.AESKeySize > 0) {
AddExtraDataAES(entry, ed);
}
#endif
var 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;
// Fix offsetOfCentraldir for AES
if (entry.AESKeySize > 0)
offset += entry.AESOverheadSize;
// Activate the entry.
curEntry = entry;
crc.Reset();
if (method == CompressionMethod.Deflated) {
deflater_.Reset();
deflater_.SetLevel(compressionLevel);
}
size = 0;
if (entry.IsCrypted) {
#if !NET_1_1 && !NETCF_2_0
if (entry.AESKeySize > 0) {
WriteAESHeader(entry);
} else
#endif
{
if (entry.Crc < 0) { // so testing Zip will says its ok
WriteEncryptionHeader(entry.DosTime << 16);
} else {
WriteEncryptionHeader(entry.Crc);
}
}
}
}