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Reading data, of which bit sizes are not multiples of 8.

Posted on 2004-10-21
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Last Modified: 2008-03-03
Ok, I am familiar with the BinaryReader class, and it's plethora of supported data formats

yet it is still very limited to what I need to do.

EXPERTS, what do you think is the best way, in .Net, to read and write 9,10,11 and especially 12 bit data.


My first inclination seems like a hack.  Where I would read data in 16-bit words, and perform bit masking on the data for each acquired value.  I'm sure that would work, but there's gotta be a better way.
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Question by:Tertioptus
    4 Comments
     
    LVL 55

    Expert Comment

    by:Jaime Olivares
    Have a look to this class, maybe could be helpful:
    http://www.codeproject.com/cpp/XBitArray.asp
    Good luck,
    Jaime.
    0
     

    Expert Comment

    by:SuperCableMan
    Why not try using a bitfield or some fancy union? Then use a memcpy directly into the struct / union?

    typedef struct EIGHTBITVAL
    {
       unsigned char bit1 :1;
       unsigned char bit2 :1;
      ...
       unsigned char bit8 :1;
    }EightBit_t;

    typedef struct 10BITVAL
    {
       unsigned char bit1  :1;
       ...
       unsigned char bit10 :1;
    }TenBit_t;

    typedef struct ODDSIZEVALUE
    {
        union
        {
           struct 8
           {
               EightBit eight;
           }
           struct 10
           {
               TenBit_t  ten;
            };
           ....
           unsigned char workWithThisOne;
        }
    }

    Struct'ing it out like that might help.  Using that char at the end of the union will allow you to do whatever math you need to do, then switch between the types (because of the union) as necesary.  You may have some more overhead in keeping track of what size (8,9,10 bit value) but i hope that helps.
    0
     
    LVL 5

    Author Comment

    by:Tertioptus
    Im sorry.  I'm looking for c# code.
    0
     
    LVL 55

    Accepted Solution

    by:
    Have you seen the BitArray class from .Net framework?

    it is located in the System.Collections namespace.
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