/// <summary>
/// SharpZip½âѹËõ
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public static byte[] DecompressSharpZip(byte[] buffer)
{
if (buffer == null || buffer.Length == 0)
{
return buffer;
}
using (MemoryStream inStream = new MemoryStream(buffer))
{
InflaterInputStream unCompressStream = new InflaterInputStream(inStream);
MemoryStream outStream = new MemoryStream();
int mSize;
Byte[] mWriteData = new Byte[4096];
while ((mSize = unCompressStream.Read(mWriteData, 0, mWriteData.Length)) > 0)
{
outStream.Write(mWriteData, 0, mSize);
}
unCompressStream.Close();
return outStream.ToArray();
}
}
/// <summary>
/// Creates an input stream reading a zip entry
/// </summary>
/// <param name="entryIndex">The index of the entry to obtain an input stream for.</param>
/// <returns>
/// An input <see cref="Stream"/> containing data for this <paramref name="entryIndex"/>
/// </returns>
/// <exception cref="ObjectDisposedException">
/// The ZipFile has already been closed
/// </exception>
/// <exception cref="SharpZip.Zip.ZipException">
/// The compression method for the entry is unknown
/// </exception>
/// <exception cref="IndexOutOfRangeException">
/// The entry is not found in the ZipFile
/// </exception>
public Stream GetInputStream(long entryIndex)
{
if ( isDisposed_ ) {
throw new ObjectDisposedException("ZipFile");
}
long start = LocateEntry(entries_[entryIndex]);
CompressionMethod method = entries_[entryIndex].CompressionMethod;
Stream result = new PartialInputStream(this, start, entries_[entryIndex].CompressedSize);
if (entries_[entryIndex].IsCrypted == true) {
#if NETCF_1_0
throw new ZipException("decryption not supported for Compact Framework 1.0");
#else
result = CreateAndInitDecryptionStream(result, entries_[entryIndex]);
if (result == null) {
throw new ZipException("Unable to decrypt this entry");
}
#endif
}
switch (method) {
case CompressionMethod.Stored:
// read as is.
break;
case CompressionMethod.Deflated:
// No need to worry about ownership and closing as underlying stream close does nothing.
result = new InflaterInputStream(result, new Inflater(true));
break;
default:
throw new ZipException("Unsupported compression method " + method);
}
return result;
}