ntohs? htons?

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4 total messages Started by Chris Sun, 19 Oct 2003 02:06

#374

Author: Chris
Date: Sun, 19 Oct 2003 02:06

7 lines
1074 bytes

Hi
I have tried looking for these functions Ntohs (Network To Host Short) and
htons(Host to Network Short) functions in Java but can't find any. Is there
a way to implement this function?

Thanks
Chris

Re: ntohs? htons?

#375

Author: John McGrath [TeamB]
Date: Sun, 19 Oct 2003 22:55

19 lines
1461 bytes

On 10/18/2003 at 10:06:55 PM, Chris wrote:

> I have tried looking for these functions Ntohs (Network To Host
> Short) and htons(Host to Network Short) functions in Java but can't
> find any. Is there a way to implement this function?

Can you be more specific about what you are trying to do?

When you write numeric values to streams, the standard Java classes
always use network order, so I doubt that you really need these methods.

-- 
Regards,

John McGrath [TeamB]

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Re: ntohs? htons?

#376

Author: Tor Iver Wilhelmsen (TeamB)
Date: Mon, 20 Oct 2003 06:50

9 lines
1258 bytes

"Chris" <cchuah@tycoint.com> writes:

> I have tried looking for these functions Ntohs (Network To Host
> Short) and htons(Host to Network Short) functions in Java but can't
> find any. Is there a way to implement this function?

They are not necessary: The Java language defines byte ordering in a
way to be the same as network byte ordering. So the byte ordering
problems that those functions seek to fix are nonexistent.

Re: ntohs? htons?

#377

Author: Shankar Unni
Date: Mon, 20 Oct 2003 20:19

21 lines
1848 bytes

John McGrath [TeamB] wrote:

> Can you be more specific about what you are trying to do?
> 
> When you write numeric values to streams, the standard Java classes
> always use network order, so I doubt that you really need these methods.

Perhaps he already has a binary stream from somewhere, and wants to
interpret a sequence of 2 bytes as a short.

Answer:

a. write your own routine that can take two bytes and return a short
(and does all the shifting and or'ing), or
b. use java.io.DataInputStream.

  byte[] bytes = .. some binary data ..
  DataInputStream is =
      new DataInputStream(new ByteArrayInputStream(bytes));
  ..
  // call is.read{Short,Long,UnsignedShort,...}()

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