public ZipInputStream(Stream baseInputStream, int bufferSize) : base(baseInputStream, new Inflater(true), bufferSize)
{
this.crc = new Crc32();
this.internalReader = new ReadDataHandler(this.ReadingNotAvailable);
}
private static void ZipSetp(string strDirectory, ZipOutputStream s, string parentPath)
{
if (strDirectory[strDirectory.Length - 1] != Path.DirectorySeparatorChar)
{
strDirectory = strDirectory + Path.DirectorySeparatorChar;
}
Crc32 crc = new Crc32();
string[] fileSystemEntries = Directory.GetFileSystemEntries(strDirectory);
foreach (string str in fileSystemEntries)
{
if (Directory.Exists(str))
{
string str2 = parentPath;
str2 = str2 + str.Substring(str.LastIndexOf(@"\") + 1) + @"\";
ZipSetp(str, s, str2);
}
else
{
using (FileStream stream = File.OpenRead(str))
{
byte[] buffer = new byte[stream.Length];
stream.Read(buffer, 0, buffer.Length);
ZipEntry entry = new ZipEntry(parentPath + str.Substring(str.LastIndexOf(@"\") + 1)) {
DateTime = DateTime.Now,
Size = stream.Length
};
stream.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
s.PutNextEntry(entry);
s.Write(buffer, 0, buffer.Length);
}
}
}
}
public override void Close()
{
this.internalReader = new ReadDataHandler(this.ReadingNotAvailable);
this.crc = null;
this.entry = null;
base.Close();
}
private bool ReadHeader()
{
int num4;
int num5;
this.crc = new Crc32();
if (base.inputBuffer.Available <= 0)
{
base.inputBuffer.Fill();
if (base.inputBuffer.Available <= 0)
{
return false;
}
}
Crc32 crc = new Crc32();
int num = base.inputBuffer.ReadLeByte();
if (num < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num);
if (num != 0x1f)
{
throw new GZipException("Error GZIP header, first magic byte doesn't match");
}
num = base.inputBuffer.ReadLeByte();
if (num < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
if (num != 0x8b)
{
throw new GZipException("Error GZIP header, second magic byte doesn't match");
}
crc.Update(num);
int num2 = base.inputBuffer.ReadLeByte();
if (num2 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
if (num2 != 8)
{
throw new GZipException("Error GZIP header, data not in deflate format");
}
crc.Update(num2);
int num3 = base.inputBuffer.ReadLeByte();
if (num3 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num3);
if ((num3 & 0xe0) != 0)
{
throw new GZipException("Reserved flag bits in GZIP header != 0");
}
for (num4 = 0; num4 < 6; num4++)
{
num5 = base.inputBuffer.ReadLeByte();
if (num5 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num5);
}
if ((num3 & 4) != 0)
{
for (num4 = 0; num4 < 2; num4++)
{
num5 = base.inputBuffer.ReadLeByte();
if (num5 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num5);
}
if ((base.inputBuffer.ReadLeByte() < 0) || (base.inputBuffer.ReadLeByte() < 0))
{
throw new EndOfStreamException("EOS reading GZIP header");
}
int num6 = base.inputBuffer.ReadLeByte();
int num7 = base.inputBuffer.ReadLeByte();
if ((num6 < 0) || (num7 < 0))
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num6);
crc.Update(num7);
int num8 = (num6 << 8) | num7;
for (num4 = 0; num4 < num8; num4++)
{
num5 = base.inputBuffer.ReadLeByte();
if (num5 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num5);
}
}
if ((num3 & 8) != 0)
{
while ((num5 = base.inputBuffer.ReadLeByte()) > 0)
{
crc.Update(num5);
}
if (num5 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num5);
}
if ((num3 & 0x10) != 0)
{
while ((num5 = base.inputBuffer.ReadLeByte()) > 0)
{
crc.Update(num5);
}
if (num5 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num5);
}
if ((num3 & 2) != 0)
{
int num10 = base.inputBuffer.ReadLeByte();
if (num10 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
int num9 = base.inputBuffer.ReadLeByte();
if (num9 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
num10 = (num10 << 8) | num9;
if (num10 != (((int) crc.Value) & 0xffff))
{
throw new GZipException("Header CRC value mismatch");
}
}
this.readGZIPHeader = true;
return true;
}