• Charles Hixson <charleshixsn earthlink.net> Sep 18 2008
• BCS <ao pathlink.com> Sep 18 2008
• Tomas Lindquist Olsen <tomas famolsen.dk> Sep 18 2008
• Charles Hixson <charleshixsn earthlink.net> Sep 18 2008
• Tomas Lindquist Olsen <tomas famolsen.dk> Sep 18 2008

Charles Hixson <charleshixsn earthlink.net> writes:

Is it possible to read from a byte or ubyte array as if from a stream? 
It looks like it should be not only possible, but easy...but I haven't 
figured it out.

BufferedFile *MUST* do that kind of thing internally, but it feels like 
there ought to be a way to say "This array is your data, read from it!" 
rather than digging through the guts of it and copying all the relevant 
code into a separate code-space.

BCS <ao pathlink.com> writes:

Reply to Charles,

 Is it possible to read from a byte or ubyte array as if from a stream?
 It looks like it should be not only possible, but easy...but I haven't
 figured it out.
 
 BufferedFile *MUST* do that kind of thing internally, but it feels
 like there ought to be a way to say "This array is your data, read
 from it!" rather than digging through the guts of it and copying all
 the relevant code into a separate code-space.
 


MemoryStream
http://www.digitalmars.com/d/1.0/phobos/std_stream.html

Tomas Lindquist Olsen <tomas famolsen.dk> writes:

BCS wrote:
 Reply to Charles,
 
 Is it possible to read from a byte or ubyte array as if from a stream?
 It looks like it should be not only possible, but easy...but I haven't
 figured it out.

 BufferedFile *MUST* do that kind of thing internally, but it feels
 like there ought to be a way to say "This array is your data, read
 from it!" rather than digging through the guts of it and copying all
 the relevant code into a separate code-space.


 MemoryStream
 http://www.digitalmars.com/d/1.0/phobos/std_stream.html
 
 


 From what I read, MemoryStream copies, TArrayStream does not
Not sure what's wanted here though :)

Charles Hixson <charleshixsn earthlink.net> writes:

Tomas Lindquist Olsen wrote:
 BCS wrote:
 Reply to Charles,

 Is it possible to read from a byte or ubyte array as if from a stream?
 It looks like it should be not only possible, but easy...but I haven't
 figured it out.

 BufferedFile *MUST* do that kind of thing internally, but it feels
 like there ought to be a way to say "This array is your data, read
 from it!" rather than digging through the guts of it and copying all
 the relevant code into a separate code-space.


 MemoryStream
 http://www.digitalmars.com/d/1.0/phobos/std_stream.html


  From what I read, MemoryStream copies, TArrayStream does not
 Not sure what's wanted here though :)



TArrayStream would be what I want, except that it seems to require that 
the compilation be in release mode.  I'm going to need to study just 
what that means.  But if it isn't what's needed, then MemoryStream seems 
a reasonable alternative.

(My suspicion is that it only constructs an array of bytes of memory if 
you don't pass it a buffer...but I haven't checked.  The documentation 
sure seems to say that it copies the buffer.)

Tomas Lindquist Olsen <tomas famolsen.dk> writes:

Charles Hixson wrote:
 Is it possible to read from a byte or ubyte array as if from a stream? 
 It looks like it should be not only possible, but easy...but I haven't 
 figured it out.
 
 BufferedFile *MUST* do that kind of thing internally, but it feels like 
 there ought to be a way to say "This array is your data, read from it!" 
 rather than digging through the guts of it and copying all the relevant 
 code into a separate code-space.


Now, I don't use phobos, but I think you're looking for std.stream.TArrayStream

something like:

---
auto data = new ubyte[1024];
auto str = new TArrayStream!(ubyte[])(data);
ubyte ub;
str.read(ub);
---

HTH