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Full Discussion: Platform type in Unix
Top Forums Programming Platform type in Unix Post 302121146 by porter on Tuesday 12th of June 2007 04:50:58 AM
Old 06-12-2007
Sure, the issue with big/little endian is their storage in memory. So "\001\000\000\000" sets up four bytes of memory, this could also be done as

char buffer[]={1,0,0,0};

but the string approach allows it to be done inline and use octel encoding, hence the three digits per byte.

Then we try and read a short from that area of memory, now we actually don't know how big a short is, but it's unlikely to be more than four bytes, the spec only says that a short should not be longer than a long, so casting it to a (const short *) means this is a pointer to a short, then the preceeding * gets the value of at that pointer.

If this was a big-endian machine it would have loaded 0x0100 into the short, if it was little-endian it would have loaded 0x0001.

In the very rare case that a short was 4 bytes, then the big-endian machine would have loaded 0x01000000 hence the test for < 256.
 

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LEARN ABOUT OPENSOLARIS

mlib_vectorreversebyteorder_inp

mlib_VectorReverseByteOrder_Inp(3MLIB)			    mediaLib Library Functions			    mlib_VectorReverseByteOrder_Inp(3MLIB)

NAME

       mlib_VectorReverseByteOrder_Inp - reverse byte order of vector, in place

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_VectorReverseByteOrder_Inp(void *xz,
	    mlib_s32 n, mlib_s32 s);

DESCRIPTION

       The mlib_VectorReverseByteOrder_Inp() function changes the encoding of each element from big endian to little endian, or from little endian
       to big endian.

       It reverses the byte order of each element of the vector, in place.

PARAMETERS

       The function takes the following arguments:

       xz    Pointer to the input and output vector.

       n     Number of elements in the vectors.

       s     Size of elements in bytes.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_VectorReverseByteOrder(3MLIB), mlib_VectorReverseByteOrder_S16(3MLIB), mlib_VectorReverseByteOrder_S16_S16(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007				    mlib_VectorReverseByteOrder_Inp(3MLIB)
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