/// <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.CENSIG ||
header == ZipConstants.ENDSIG ||
header == ZipConstants.CENDIGITALSIG ||
header == ZipConstants.CENSIG64) {
// No more individual entries exist
Close();
return null;
}
// -jr- 07-Dec-2003 Ignore spanning temporary signatures if found
// SPANNINGSIG is same as descriptor signature and is untested as yet.
if (header == ZipConstants.SPANTEMPSIG || header == ZipConstants.SPANNINGSIG) {
header = inputBuffer.ReadLeInt();
}
if (header != ZipConstants.LOCSIG) {
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.ConvertToString(buffer);
entry = new ZipEntry(name, versionRequiredToExtract);
entry.Flags = flags;
if (method == (int)CompressionMethod.Stored && (!isCrypted && csize != size || (isCrypted && csize - ZipConstants.CRYPTO_HEADER_SIZE != size))) {
throw new ZipException("Stored, but compressed != uncompressed");
}
if (method != (int)CompressionMethod.Stored && method != (int)CompressionMethod.Deflated) {
throw new ZipException("Unknown compression method " + method);
}
entry.CompressionMethod = (CompressionMethod)method;
if ((flags & 8) == 0) {
entry.Crc = crc2 & 0xFFFFFFFFL;
entry.Size = size & 0xFFFFFFFFL;
entry.CompressedSize = csize & 0xFFFFFFFFL;
} else {
// This allows for GNU, WinZip and possibly other archives, the PKZIP spec says these 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.DosTime = dostime;
if (extraLen > 0) {
byte[] extra = new byte[extraLen];
inputBuffer.ReadRawBuffer(extra);
entry.ExtraData = extra;
}
internalReader = new ReaderDelegate(InitialRead);
return entry;
}
/// <summary>
/// Creates a copy of the given zip entry.
/// </summary>
/// <param name="e">
/// The entry to copy.
/// </param>
public ZipEntry(ZipEntry e)
{
known = e.known;
name = e.name;
size = e.size;
compressedSize = e.compressedSize;
crc = e.crc;
dosTime = e.dosTime;
method = e.method;
ExtraData = e.ExtraData; // Note use of property ensuring data is unique
comment = e.comment;
versionToExtract = e.versionToExtract;
versionMadeBy = e.versionMadeBy;
externalFileAttributes = e.externalFileAttributes;
flags = e.flags;
zipFileIndex = -1;
offset = 0;
}
/// <summary>
/// Closes the current zip entry and moves to the next one.
/// </summary>
/// <exception cref="InvalidOperationException">
/// The stream is closed
/// </exception>
/// <exception cref="ZipException">
/// The Zip stream ends early
/// </exception>
public void CloseEntry()
{
if (crc == null) {
throw new InvalidOperationException("Closed.");
}
if (entry == null) {
return;
}
if (method == (int)CompressionMethod.Deflated) {
if ((flags & 8) != 0) {
// We don't know how much we must skip, read until end.
byte[] tmp = new byte[2048];
while (Read(tmp, 0, tmp.Length) > 0)
;
// read will close this entry
return;
}
csize -= inf.TotalIn;
inputBuffer.Available -= inf.RemainingInput;
}
if (inputBuffer.Available > csize && csize >= 0) {
inputBuffer.Available = (int)((long)inputBuffer.Available - csize);
} else {
csize -= inputBuffer.Available;
inputBuffer.Available = 0;
while (csize != 0) {
int skipped = (int)base.Skip(csize & 0xFFFFFFFFL);
if (skipped <= 0) {
throw new ZipException("Zip archive ends early.");
}
csize -= skipped;
}
}
size = 0;
crc.Reset();
if (method == (int)CompressionMethod.Deflated) {
inf.Reset();
}
entry = null;
}
/// <summary>
/// Closes the zip input stream
/// </summary>
public override void Close()
{
base.Close();
crc = null;
entry = null;
}
/// <summary>
/// Reads a block of bytes from the current zip entry.
/// </summary>
/// <returns>
/// The number of bytes read (this may be less than the length requested, even before the end of stream), or 0 on end of stream.
/// </returns>
/// <exception name="IOException">
/// An i/o error occured.
/// </exception>
/// <exception cref="ZipException">
/// The deflated stream is corrupted.
/// </exception>
/// <exception cref="InvalidOperationException">
/// The stream is not open.
/// </exception>
public int BodyRead(byte[] b, int off, int len)
{
if (crc == null) {
throw new InvalidOperationException("Closed.");
}
if (entry == null || len <= 0 ) {
return 0;
}
bool finished = false;
switch (method) {
case (int)CompressionMethod.Deflated:
len = base.Read(b, off, len);
if (len <= 0) {
if (!inf.IsFinished) {
throw new ZipException("Inflater not finished!?");
}
inputBuffer.Available = inf.RemainingInput;
if ((flags & 8) == 0 && (inf.TotalIn != csize || inf.TotalOut != size)) {
throw new ZipException("size mismatch: " + csize + ";" + size + " <-> " + inf.TotalIn + ";" + inf.TotalOut);
}
inf.Reset();
finished = true;
}
break;
case (int)CompressionMethod.Stored:
if (len > csize && csize >= 0) {
len = (int)csize;
}
len = inputBuffer.ReadClearTextBuffer(b, off, len);
if (len > 0) {
csize -= len;
size -= len;
}
if (csize == 0) {
finished = true;
} else {
if (len < 0) {
throw new ZipException("EOF in stored block");
}
}
break;
}
if (len > 0) {
crc.Update(b, off, len);
}
if (finished) {
StopDecrypting();
if ((flags & 8) != 0) {
ReadDataDescriptor();
}
if ((crc.Value & 0xFFFFFFFFL) != entry.Crc && entry.Crc != -1) {
throw new ZipException("CRC mismatch");
}
crc.Reset();
entry = null;
}
return len;
}
/// <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.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 (entries == null) {
throw new InvalidOperationException("ZipOutputStream was finished");
}
if (curEntry != null) {
CloseEntry();
}
if (entries.Count >= 0xffff) {
throw new ZipException("Too many entries for Zip file");
}
CompressionMethod method = entry.CompressionMethod;
int compressionLevel = defaultCompressionLevel;
entry.Flags = 0;
patchEntryHeader = false;
bool headerInfoAvailable = true;
if (method == CompressionMethod.Stored) {
if (entry.CompressedSize >= 0) {
if (entry.Size < 0) {
entry.Size = entry.CompressedSize;
} else if (entry.Size != entry.CompressedSize) {
throw new ZipException("Method STORED, but compressed size != size");
}
} else {
if (entry.Size >= 0) {
entry.CompressedSize = entry.Size;
}
}
if (entry.Size < 0 || entry.Crc < 0) {
if (CanPatchEntries == true) {
headerInfoAvailable = false;
}
else {
// Cant patch entries so storing is not possible.
method = CompressionMethod.Deflated;
compressionLevel = 0;
}
}
}
if (method == CompressionMethod.Deflated) {
if (entry.Size == 0) {
// No need to compress - no data.
entry.CompressedSize = entry.Size;
entry.Crc = 0;
method = CompressionMethod.Stored;
} else if (entry.CompressedSize < 0 || entry.Size < 0 || entry.Crc < 0) {
headerInfoAvailable = false;
}
}
if (headerInfoAvailable == false) {
if (CanPatchEntries == false) {
entry.Flags |= 8;
} else {
patchEntryHeader = true;
}
}
if (Password != null) {
entry.IsCrypted = true;
if (entry.Crc < 0) {
// Need to append data descriptor as crc is used for encryption and its not known.
entry.Flags |= 8;
}
}
entry.Offset = (int)offset;
entry.CompressionMethod = (CompressionMethod)method;
curMethod = method;
// Write the local file header
WriteLeInt(ZipConstants.LOCSIG);
WriteLeShort(entry.Version);
WriteLeShort(entry.Flags);
WriteLeShort((byte)method);
WriteLeInt((int)entry.DosTime);
if (headerInfoAvailable == true) {
WriteLeInt((int)entry.Crc);
WriteLeInt(entry.IsCrypted ? (int)entry.CompressedSize + ZipConstants.CRYPTO_HEADER_SIZE : (int)entry.CompressedSize);
WriteLeInt((int)entry.Size);
} else {
if (patchEntryHeader == true) {
headerPatchPos = baseOutputStream.Position;
}
WriteLeInt(0); // Crc
WriteLeInt(0); // Compressed size
WriteLeInt(0); // Uncompressed size
}
byte[] name = ZipConstants.ConvertToArray(entry.Name);
if (name.Length > 0xFFFF) {
throw new ZipException("Entry name too long.");
}
byte[] extra = entry.ExtraData;
if (extra == null) {
extra = new byte[0];
}
if (extra.Length > 0xFFFF) {
throw new ZipException("Extra data too long.");
}
WriteLeShort(name.Length);
WriteLeShort(extra.Length);
baseOutputStream.Write(name, 0, name.Length);
baseOutputStream.Write(extra, 0, extra.Length);
offset += ZipConstants.LOCHDR + name.Length + extra.Length;
// Activate the entry.
curEntry = entry;
crc.Reset();
if (method == CompressionMethod.Deflated) {
def.Reset();
def.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>
/// Closes the current entry, updating header and footer information as required
/// </summary>
/// <exception cref="System.IO.IOException">
/// An I/O error occurs.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// No entry is active.
/// </exception>
public void CloseEntry()
{
if (curEntry == null) {
throw new InvalidOperationException("No open entry");
}
// First finish the deflater, if appropriate
if (curMethod == CompressionMethod.Deflated) {
base.Finish();
}
long csize = curMethod == CompressionMethod.Deflated ? def.TotalOut : size;
if (curEntry.Size < 0) {
curEntry.Size = size;
} else if (curEntry.Size != size) {
throw new ZipException("size was " + size + ", but I expected " + curEntry.Size);
}
if (curEntry.CompressedSize < 0) {
curEntry.CompressedSize = csize;
} else if (curEntry.CompressedSize != csize) {
throw new ZipException("compressed size was " + csize + ", but I expected " + curEntry.CompressedSize);
}
if (curEntry.Crc < 0) {
curEntry.Crc = crc.Value;
} else if (curEntry.Crc != crc.Value) {
throw new ZipException("crc was " + crc.Value + ", but I expected " + curEntry.Crc);
}
offset += csize;
if (offset > 0xffffffff) {
throw new ZipException("Maximum Zip file size exceeded");
}
if (curEntry.IsCrypted == true) {
curEntry.CompressedSize += ZipConstants.CRYPTO_HEADER_SIZE;
}
// Patch the header if possible
if (patchEntryHeader == true) {
long curPos = baseOutputStream.Position;
baseOutputStream.Seek(headerPatchPos, SeekOrigin.Begin);
WriteLeInt((int)curEntry.Crc);
WriteLeInt((int)curEntry.CompressedSize);
WriteLeInt((int)curEntry.Size);
baseOutputStream.Seek(curPos, SeekOrigin.Begin);
patchEntryHeader = false;
}
// Add data descriptor if flagged as required
if ((curEntry.Flags & 8) != 0) {
WriteLeInt(ZipConstants.EXTSIG);
WriteLeInt((int)curEntry.Crc);
WriteLeInt((int)curEntry.CompressedSize);
WriteLeInt((int)curEntry.Size);
offset += ZipConstants.EXTHDR;
}
entries.Add(curEntry);
curEntry = null;
}
