BigEndian to LittleEndian conversion

[nappaji]

I am looking for a function that will convert an argument(either 16 bit, 32
bit, ... basically a BIGENDIAN) to a LITTLE ENDIAN. The argument can be a
pointer to some memory address which will hold the arg. value.

This function should be intrinsic and lightweight.

 

[Zyrenthian]

byteswap(char* ptr, int size)
{
[ignore]
for(int i = 0, j = size-1;i<j;i++,j--)
{
char temp = ptr;
ptr = ptr[j];
ptr[j] = ptr;
}
}

That should do it... to call


byteswap(type, sizeof(type))

Matt

 

[Zyrenthian]

Sorry... typo

byteswap(char* ptr, int size)
{
for(int i = 0, j = size-1;i<j;i++,j--)
{
char temp = ptr[ignore][/ignore];
ptr[ignore][/ignore] = ptr[j];
ptr[j] = temp;
}
}

That should do it... to call


byteswap(type, sizeof(type))

Matt

 

[Nosferatu]

you can use ANSI swab function, defined as:

 void swab(const void * srt,void *dest,size_t nbytes);

Nosferatu
We are what we eat...
There's no such thing as free meal...

 

[abp]

There is the net functions

#include <sys/types.h>
#include <netinet/in.h>


ulong htonl(ulong hostlong)
ulong ntohl(ulong netlong)
ushort ntohs(ushort netshort)
ushort htons(ushort hostshort)


These convert between network and host byte
order for 32 & 16 bit quantities respectively.


Since the TCP/IP protocol uses big-endian byte order for network addresses, htonl effectively converts from little
endian to big-endian if your host network order is little-endian.

Regards

Anand
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Mail me at abpillai@excite.com if you want additional help. I dont promise that I can solve your problem, but I will try my best.
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