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Full Discussion: AIX endian again
Top Forums UNIX for Advanced & Expert Users AIX endian again Post 18003 by Shobhit on Friday 22nd of March 2002 12:11:17 AM
Old 03-22-2002
To many doubts

Hi Perderabo
I am basically trying to read a radar message following ASTERIX format(which is bit oriented) which comes on HDLC(little Endian) line.Now I have to put the bit stream coming into standard structures as per protocol.This decoding has to been implemented on Compaq(little endian) and i have to implement rather port it on HP(big endian).Since there is relative difference in LSB and MSB bits(I mean zeroth bit and 7th bit) on two platforms ,will redefining bit pattern will be a good solution to solve the problem.
Also i have one general query regarding TCP and endian.Suppose I transmit from my application one long integer(say 8 bytes size) which is ruuning on littel endian and at other end on big endian system read it directly,will this cause some error.
Which is the ideal way or recommended way to transmit integers on network.Should we convert them to chars(one byte) and transmit 4 chars for one integer and regenerate integer using program at other end.
The last two question's answer will help me in my general understanding of transmission on TCP/IP and other lines.
hope Perderabo you will be again kind enough to share some more knowlege of yours with all of us.
What difference it makes when u say TCP transmits octet and not byte?

I guess thats too many questions in one query.
sorry for that.

Last edited by Shobhit; 03-22-2002 at 02:18 AM..

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ENDIAN(3)						     Linux Programmer's Manual							 ENDIAN(3)

htobe16, htole16, be16toh, le16toh, htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh - convert values between host and big-/little-endian byte order SYNOPSIS
#define _BSD_SOURCE #include <endian.h> uint16_t htobe16(uint16_t host_16bits); uint16_t htole16(uint16_t host_16bits); uint16_t be16toh(uint16_t big_endian_16bits); uint16_t le16toh(uint16_t little_endian_16bits); uint32_t htobe32(uint32_t host_32bits); uint32_t htole32(uint32_t host_32bits); uint32_t be32toh(uint32_t big_endian_32bits); uint32_t le32toh(uint32_t little_endian_32bits); uint64_t htobe64(uint64_t host_64bits); uint64_t htole64(uint64_t host_64bits); uint64_t be64toh(uint64_t big_endian_64bits); uint64_t le64toh(uint64_t little_endian_64bits); DESCRIPTION
These functions convert the byte encoding of integer values from the byte order that the current CPU (the "host") uses, to and from little- endian and big-endian byte order. The number, nn, in the name of each function indicates the size of integer handled by the function, either 16, 32, or 64 bits. The functions with names of the form "htobenn" convert from host byte order to big-endian order. The functions with names of the form "htolenn" convert from host byte order to little-endian order. The functions with names of the form "benntoh" convert from big-endian order to host byte order. The functions with names of the form "lenntoh" convert from little-endian order to host byte order. VERSIONS
These function were added to glibc in version 2.9. CONFORMING TO
These functions are nonstandard. Similar functions are present on the BSDs, where the required header file is <sys/endian.h> instead of <endian.h>. Unfortunately, NetBSD, FreeBSD, and glibc haven't followed the original OpenBSD naming convention for these functions, whereby the nn component always appears at the end of the function name (thus, for example, in NetBSD, FreeBSD, and glibc, the equivalent of OpenB- SDs "betoh32" is "be32toh"). NOTES
These functions are similar to the older byteorder(3) family of functions. For example, be32toh() is identical to ntohl(). The advantage of the byteorder(3) functions is that they are standard functions available on all Unix systems. On the other hand, the fact that they were designed for use in the context of TCP/IP means that they lack the 64-bit and little-endian variants described in this page. EXAMPLE
The program below display the results of converting an integer from host byte order to both little-endian and big-endian byte order. Since host byte order is either little-endian or big-endian, only one of these conversions will have an effect. When we run this program on a little-endian system such as x86-32, we see the following: $ ./a.out x.u32 = 0x44332211 htole32(x.u32) = 0x44332211 htobe32(x.u32) = 0x11223344 Program source #include <endian.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { union { uint32_t u32; uint8_t arr[4]; } x; x.arr[0] = 0x11; /* Lowest-address byte */ x.arr[1] = 0x22; x.arr[2] = 0x33; x.arr[3] = 0x44; /* Highest-address byte */ printf("x.u32 = 0x%x ", x.u32); printf("htole32(x.u32) = 0x%x ", htole32(x.u32)); printf("htobe32(x.u32) = 0x%x ", htobe32(x.u32)); exit(EXIT_SUCCESS); } SEE ALSO
byteorder(3) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2009-01-19 ENDIAN(3)

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