Truncating a Stream...

[rlrcstr]

Is it possible to truncate a MemroyStream to free up the space up to the
current position?

I wantes to be able to just keep dumping bytes into a stream and then read
the stream as needed. After the read, free up the portion of the stream I
read, esentially making the first unread byte the first byte in the stream.

Thanks.

Jerry

[Jon Skeet [C# MVP]]

rlrcstr <rl*****@discussions.microsoft.comwrote:

Is it possible to truncate a MemroyStream to free up the space up to the
current position?

I wantes to be able to just keep dumping bytes into a stream and then read
the stream as needed. After the read, free up the portion of the stream I
read, esentially making the first unread byte the first byte in the stream.

MemoryStreams are basically backed by a byte array. You'd need to make
a copy of the part of the byte array you still need, and either create
a new MemoryStream or reset the current one. Your Position property is
likely to be wrong afterwards though...

It would possibly be easier to write such a stream class yourself than
to use MemoryStream. For one thing, you could make it use several
chunks of memory rather than a single byte array, which would make it
cheaper to throw the start away.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[rlrcstr]

Thanks Jon. THat's basically what I ended up doing.

"Jon Skeet [C# MVP]" wrote:

rlrcstr <rl*****@discussions.microsoft.comwrote:

Is it possible to truncate a MemroyStream to free up the space up to the
current position?

I wantes to be able to just keep dumping bytes into a stream and then read
the stream as needed. After the read, free up the portion of the stream I
read, esentially making the first unread byte the first byte in the stream.

MemoryStreams are basically backed by a byte array. You'd need to make
a copy of the part of the byte array you still need, and either create
a new MemoryStream or reset the current one. Your Position property is
likely to be wrong afterwards though...

It would possibly be easier to write such a stream class yourself than
to use MemoryStream. For one thing, you could make it use several
chunks of memory rather than a single byte array, which would make it
cheaper to throw the start away.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Peter Bromberg [C# MVP]]

Sounds to me like you want / need some implementation of a CircularBuffer
class.
Peter

--
Co-founder, Eggheadcafe.com developer portal:
http://www.eggheadcafe.com
UnBlog:
http://petesbloggerama.blogspot.com


"rlrcstr" wrote:

Is it possible to truncate a MemroyStream to free up the space up to the
current position?

I wantes to be able to just keep dumping bytes into a stream and then read
the stream as needed. After the read, free up the portion of the stream I
read, esentially making the first unread byte the first byte in the stream.

Thanks.

Jerry