How to copy a buffer in spin

soshimo · 2010-07-15 18:37

I have a need to copy a buffer from a spin object. This buffer is in the VAR section of the object I'm consuming.

My first thought was something like this:

VAR 
   byte source[noparse][[/noparse]32]
   
PUB ReadBuffer
   ' do something with source buffer

PUB CopyBuffer(bufferAddress, sizeAddress) | size, dest, index
  size := long[noparse][[/noparse]size]

  ' what to do with dest here?
  'dest := long[noparse][[/noparse]bufferAddress]
  
  repeat index from 0 to size
     ' again, don't know how to set the destination buffer
     ' @dest := @source + index

     ' I think this is the right thing to do in order to increment my destination pointer
     dest := @dest + 1

The line @dest := @source + index doesn't compile, and I understand why. I guess my question is, is it possible to increment and address passed into a subroutine and how do I reference it as a destination?

TIA

soshimo · 2010-07-15 18:51

NVM, figured it out.

Here is the code that works:

PUB CopyBuffer(bufferAddress, size) | dest, index
  dest := byte[noparse][[/noparse]bufferAddress]
  
  repeat Index from 0 to size - 1
     dest := @buf + index
     dest := byte[noparse][[/noparse]@dest + 1]

Edited to fix the off by one error.

Post Edited (soshimo) : 7/15/2010 7:11:09 PM GMT

Phil Pilgrim (PhiPi) · 2010-07-15 19:54

Are your sure you copied that code correctly? What you've posted doesn't do anything at all. To where are you supposed to be copying the buffer contents? Also, be sure to look at Spin's bytemove command. I could make your job a lot easier.

-Phil

soshimo · 2010-07-15 21:07

PUB CopyBuffer(bufferAddress, size)
   bytemove(bufferAddress, @src, size)

I want to copy a buffer from an object. This pub will expose that functionality for me. I will call it like so:

theobj.copybuffer(@dest, 32)

I'm hoping that will do it for me.

Thanks for the help.

Post Edited (soshimo) : 7/15/2010 9:33:00 PM GMT

How to copy a buffer in spin

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