// NOTE this returns the offset of the first byte after the signature.
long LocateBlockWithSignature(int signature, long endLocation, int minimumBlockSize, int maximumVariableData)
{
using ( ZipHelperStream les = new ZipHelperStream(baseStream_) ) {
return les.LocateBlockWithSignature(signature, endLocation, minimumBlockSize, maximumVariableData);
}
}
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 with order offset within copies/modifies, then adds.
// This ensures that copies will not overwrite any required data.
updates_.Sort(new UpdateComparer());
}
else
{
workFile = ZipFile.Create(archiveStorage_.GetTemporaryOutput());
}
try {
foreach ( ZipUpdate update in updates_ ) {
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.
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_ ) {
sizeEntries += workFile.WriteCentralDirectoryHeader(update.OutEntry);
}
byte[] theComment = (newComment_ != null) ? newComment_.RawComment : ZipConstants.ConvertToArray(comment_);
using ( ZipHelperStream zhs = new ZipHelperStream(workFile.baseStream_) ) {
zhs.WriteEndOfCentralDirectory(updates_.Count, sizeEntries, centralDirOffset, theComment);
}
endOfStream = workFile.baseStream_.Position;
// And now patch entries...
foreach ( ZipUpdate update in updates_ ) {
// 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.Entry.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);
}
}
}
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 {
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 {
Reopen();
}
}
/// <summary>
/// Commit current updates, updating this archive.
/// </summary>
/// <seealso cref="BeginUpdate"></seealso>
/// <seealso cref="AbortUpdate"></seealso>
public void CommitUpdate()
{
CheckUpdating();
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);
}
}
}
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 !FORCE_ZIP64
if (entry.IsZip64Forced() || (entry.CompressedSize >= uint.MaxValue))
#endif
{
WriteLeInt(-1);
}
else
{
WriteLeInt((int)entry.CompressedSize);
}
#if !FORCE_ZIP64
if (entry.IsZip64Forced() || (entry.Size >= uint.MaxValue))
#endif
{
WriteLeInt(-1);
}
else
{
WriteLeInt((int)entry.Size);
}
byte[] name = ZipConstants.ConvertToArray(entry.Name);
if (name.Length > 0xffff)
{
throw new ZipException("Name too long.");
}
ZipExtraData ed = new ZipExtraData(entry.ExtraData);
if (entry.CentralHeaderRequiresZip64)
{
ed.StartNewEntry();
#if !FORCE_ZIP64
if (entry.IsZip64Forced() || (entry.Size >= 0xffffffff))
#endif
{
ed.AddLeLong(entry.Size);
}
#if !FORCE_ZIP64
if (entry.IsZip64Forced() || (entry.CompressedSize >= 0xffffffff))
#endif
{
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.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;
}
/// <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 !FORCE_ZIP64
if ( entry.IsZip64Forced() || (entry.CompressedSize >= uint.MaxValue) )
#endif
{
WriteLeInt(-1);
}
else {
WriteLeInt((int)entry.CompressedSize);
}
#if !FORCE_ZIP64
if ( entry.IsZip64Forced() || (entry.Size >= uint.MaxValue) )
#endif
{
WriteLeInt(-1);
}
else {
WriteLeInt((int)entry.Size);
}
byte[] name = ZipConstants.ConvertToArray(entry.Name);
if (name.Length > 0xffff) {
throw new ZipException("Name too long.");
}
ZipExtraData ed = new ZipExtraData(entry.ExtraData);
if ( entry.CentralHeaderRequiresZip64 ) {
ed.StartNewEntry();
#if !FORCE_ZIP64
if ( entry.IsZip64Forced() || (entry.Size >= 0xffffffff) )
#endif
{
ed.AddLeLong(entry.Size);
}
#if !FORCE_ZIP64
if ( entry.IsZip64Forced() || (entry.CompressedSize >= 0xffffffff) )
#endif
{
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.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;
}
