private static uint ComputeCrc32FromStream(Stream stream)
{
if (!stream.CanSeek)
{
throw new ArgumentException("Stream is required to support Seek operations, and does not");
}
BufferPool bufferPool = BufferPoolCollection.AutoCleanupCollection.Acquire(ZipEntryAttachment.CopyBufferSize);
byte[] array = bufferPool.Acquire();
uint num = 0U;
try
{
int bytesToRead;
while ((bytesToRead = stream.Read(array, 0, array.Length)) > 0)
{
num = ZipEntryAttachment.ComputeCrc32FromBytes(array, bytesToRead, num);
}
}
finally
{
if (array != null)
{
bufferPool.Release(array);
}
}
stream.Seek(0L, SeekOrigin.Begin);
return(num);
}
private static uint[] CompressAndWriteOutputStream(Stream outputStream, Stream inputStream, bool doComputeCrc)
{
if (outputStream == null)
{
throw new ArgumentNullException("outputStream");
}
if (inputStream == null)
{
throw new ArgumentNullException("inputStream");
}
uint num = 0U;
int num2 = 0;
BufferPool bufferPool = BufferPoolCollection.AutoCleanupCollection.Acquire(ZipEntryAttachment.CopyBufferSize);
byte[] array = bufferPool.Acquire();
uint num3 = 0U;
using (Stream stream = Streams.CreateTemporaryStorageStream())
{
try
{
int num4;
using (Stream stream2 = new DeflateStream(stream, CompressionMode.Compress, true))
{
while ((num4 = inputStream.Read(array, 0, array.Length)) > 0)
{
if (doComputeCrc)
{
num3 = ZipEntryAttachment.ComputeCrc32FromBytes(array, num4, num3);
}
num2 += num4;
stream2.Write(array, 0, num4);
}
stream2.Flush();
}
stream.Seek(0L, SeekOrigin.Begin);
while ((num4 = stream.Read(array, 0, array.Length)) > 0)
{
outputStream.Write(array, 0, num4);
num += (uint)num4;
}
}
finally
{
if (array != null)
{
bufferPool.Release(array);
}
}
}
return(new uint[]
{
num,
num3,
(uint)num2
});
}
