Byte ordering - CompWisdom
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Topic: Byte ordering


  
 Endianness - Wikipedia, the free encyclopedia
In general, the NUXI problem is the problem of transferring data between computers with differing byte order.
Endianness is also referred to as byte order or byte sex.
The Internet Protocol defines a standard "big-endian" network byte order, where binary values are in general encoded into packets, and sent out over the network, most significant byte first.
http://en.wikipedia.org/wiki/Endianness

  
 Byte Order
Processors can number the bytes within a word to make the byte with the lowest number either the leftmost or rightmost one.
The convention used by a machine is its byte order.
SPIM's byte order is determined by the byte order of the underlying hardware running the simulator.
http://www.doc.ic.ac.uk/lab/secondyear/spim/node11.html

  
 Encyclopedia4U - Byte Order Mark - Encyclopedia Article
UTF-8 text can also use a BOM, although this is rare, since UTF-8 prescribes a fixed byte order, and since UTF-8 is often assumed or implicit, so it doesn't need a signature.
In UTF-16, a BOM is expressed as the 8-bit byte sequence FE FF at the beginning of the encoded string, to indicate that the encoded characters that follow it use big-endian byte order; or it is expressed as the byte sequence FF FE to indicate little-endian order.
The UTF-8 representation of the BOM is the byte sequence EF BB BF.
http://www.encyclopedia4u.com/b/byte-order-mark.html

  
 Byte Order
Little-endian byte order became established early, I understand, because it is easer to implement in hardware; that makes little difference with today's manufacturing technology but is so prevalent because it was used in both Vaxen and the 8086 processors of the first IBM PC's.
Also note that the internet protocol standards are written in terms of "octets" of data rather than "bytes" because a byte is not always eight bits.
One is to decide on a certain byte order for all external data and to require swapping of all values written and read on a machine with a different order.
http://www.goingware.com/tips/getting-started/byteorder.html

  
 UTR#17: Character Encoding Model
Some compressing CESs are designed to produce a unique sequence of bytes for each sequence of code units, so that the compressed byte sequences can be compared for equality or ordered by binary comparison.
At the head of a data stream, the presence of a byte order mark can therefore be used to unambiguously signal the byte order of the code units.
This difference does not matter for operations on code units in memory, but the byte order becomes important when code units are serialized to sequences of bytes using a particular CES.
http://www.unicode.org/unicode/reports/tr17/

  
 Understanding big and little endian byte order
Byte 0 has a value, byte 1 has a value, etc. How these bytes are interpreted is left up to the machine.
Data is the bytes that a computer stores.
Data is stored one byte at a time.
http://www.cs.princeton.edu/~kazad/resources/cs/endian.htm

  
 FAQ - UTF and BOM
A: Data types longer than a byte can be stored in computer memory with the most significant byte (MSB) first or last.
The BE form uses big-endian byte serialization (most significant byte first), the LE form uses little-endian byte serialization (least significant byte first) and the unmarked form uses big-endian byte serialization by default, but may include a byte order mark at the beginning to indicate the actual byte serialization used.
A: A byte order mark (BOM) consists of the character code U+FEFF at the beginning of a data stream, where it can be used as a signature defining the byte order and encoding form, primarily of unmarked plaintext files.
http://www.unicode.org/unicode/faq/utf_bom.html

  
 Byte order
This means that reading byte 0, byte 1, byte 2 and byte 3 by the transputer from VME delivers respectively byte 3, byte 2, byte 1 and byte 0 according to VME; the same is true for the word order within a longword :
The byte order within a longword or word according to the transputer is opposite to the order defined by VME.
[4]BYTE bytes : PLACE bytes AT ((#1000 >< MOSTNEG INT) >> 2) : -- To access byte 1 in VME access byte 2 on the transputer byte.address.1001 IS bytes[2] :
http://www.nikhef.nl/~n48/mk4/node5.html

  
 Big endian and Little endian computers
Suppose the address of the int is A. In a so-called big endian computer, the highest order byte is stored at A, and the lowest order byte is stored at address A+3.
In a so-called little endian computer, address A stores the least significant byte and the most significant byte is at address A+3.
This means that when little endian computers are going to pass integers over the network (IP addresses for example), they need to convert them to network byte order.
http://www.cs.rpi.edu/courses/sysprog/sockets/byteorder.html

  
 Byte-order Mark
The preferred place to specify byte order is in a file header, but text files do not have headers.
With only a single set of byte-ordering rules, users of one type of microprocessor would be forced to swap the byte order every time a plain text file is read from or written to, even if the file is never transferred to another system based on a different microprocessor.
A byte-order mark is not a control character that selects the byte order of the text; it simply informs an application receiving the file that the file is byte ordered.
http://msdn.microsoft.com/library/en-us/intl/unicode_42jv.asp?frame=true

  
 DaubNET: File Formats Collection: RIFF
' specifies 'Intel' byte ordering (least significant byte first).
The file extension for RIFFs is dependent on its content.
DXR Macromedia Director Files (notice: Network byte order!)
http://www.daubnet.com/formats/RIFF.html

  
 Byte Order Macros
The host byte order is the byte order used on the current machine.
The Internet uses what is known as 'network byte order' as the standard byte order (which is in fact the big-endian byte order).
The byte order is the order in which bytes are stored to create larger data types such as the
http://developer.gnome.org/doc/API/glib/glib-byte-order-macros.html

  
 Production First Software Encyclopedia of Typography and Electronic Communication : B
byte order mark A zero-width no-break 16-bit character (at for UTF-16 encodings) or or 32-bit character (at <0000feff> for UCS-4 or UTF-32 encodings) which can be used to detect byte order by comparison to the 16-bit code point or 32-bit code point <0000fffe>.
byte A unit of computer data storage which can be thought of as consisting of one character.
byte polarity or byte pair polarity Another term for byte order, describing the physical sequence of low order to high order bytes in a data file.
http://ourworld.compuserve.com/homepages/profirst/b.htm

  
 man page(1) manual page
On the i80x86 the host byte order is Least Significant Byte first, whereas the network byte order, as used on the Internet, is Most Significant Byte first.
The htonl() function converts the unsigned integer hostlong from host byte order to network byte order.
The ntohl() function converts the unsigned integer netlong from network byte order to host byte order.
http://www.infodrom.north.de/cgi-bin/man2html?page=byteorder§ion=3&language=us

  
 Dr. Bill's Notes on "Little Endian" vs. "Big Endian"
Depending on which computing system you use, you will have to consider the byte order in which multibyte numbers are stored, particularly when you are writing those numbers to a file.
The numbers are also stored in the order in which they are printed out, so binary to decimal routines are particularly efficient.
In "Big Endian" form, by having the high-order byte come first, you can always test whether the number is positive or negative by looking at the byte at offset zero.
http://www.cs.umass.edu/~verts/cs32/endian.html

  
 Introduction to Endianness - big endian, little endian, byte order, byte swap
Even if the computers at each end are little endian, multibyte integers passed between them must be converted to network byte order prior to transmission across the network, and converted back to little endian at the receiving end.
Big endian means that the most significant byte of any multibyte data field is stored at the lowest memory address, which is also the address of the larger field.
Introduction to Endianness - big endian, little endian, byte order, byte swap
http://www.netrino.com/Publications/Glossary/Endianness.html

  
 Byte-Order, FITS Standard and MAGIC Pixels in Imcat
I have provided a command changesex which swaps the byte order.
FITS images writen by imcat tools contain a header item with key BYTEORDR and with value BIG_ENDIAN or LITTLE_ENDIAN to indicate the byte order.
So, for example, you might define this on your DEC-ALPHA but not on your Sun workstation, in which case all FITS files (and FITS data piped between processes) will conform to the NOST decree and you can access the data using binaries on either machine without confusion.
http://www.ifa.hawaii.edu/~kaiser/imcat/byteorder.html

  
 Manipulating byte order
The byte swapping routines are provided because the operating system expects addresses to be supplied in network order.
Consequently, programs are sometimes required to byte swap quantities.
The library routines that return network addresses provide them in network order so that they may simply be copied into the structures provided to the system.
http://docsrv.sco.com/SDK_netapi/sockD.misc.html

  
 random.org - who is using random.org?
In order to try to develop theories to explain some results I was getting, I wrote a computer program that uses a Monte Carlo scheme to simulate infection of cells by viruses.
I used your random sequence generator to create a list of 489 numbers, and my problem was solved.
Aaron Shaver from the Department of Biology at the University of Pennsylvania writes, "I just wanted to let you know that I'm using your #s as seeds for the pseudo-random number generator of a simulation I'm running on several different computers.
http://www.random.org/users.html

  
 Unix Incompatibility Notes: Byte Order
Any program that writes binary files that may have to be read by another computer needs to be concerned about byte order issues.
Network byte order is the standard used in packets sent over the internet.
It is big-endian (except that technically it refers to the order in which bytes are transmitted, not the order in which they are stored).
http://www.unixpapa.com/incnote/byteorder.html

  
 network byte order from FOLDOC
Nearby terms: Network Administrator « Network Application Support « Network Attached Storage « network byte order » network card » network closet » Network Computing Devices
< networking > The order in which the bytes of a multi-byte number are transmitted on a network - most significant byte first (as in " big-endian " storage).
This may or may not match the order in which numbers are normally stored in memory for a particular processor.
http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?query=network+byte+order

  
 Ethereal: Re: [ethereal-dev] Ethereal byte order bug
Subject : Re: [ethereal-dev] Ethereal byte order bug
PCAP_MAGIC is the magic number, in host byte order; PCAP_SWAPPED_MAGIC !
*/ + byte_swapped = FALSE; + modified = FALSE; + break; + + case PCAP_MODIFIED_MAGIC: + /* Host that wrote it has our byte order, but was running + a program using the patched "libpcap".
http://www.ethereal.com/lists/ethereal-dev/199911/msg00134.html

  
 Linux Development
The author also addresses byte order and alignment.
Records joystick caliberation information to file (includes calibration program).
C++ const Correctness (Linux Journal) - Using const correctly in order to future-proof today's class designs.
http://www.linux.ittoolbox.com/nav/t.asp?t=391&p=391&h1=391

  
 How To Think Up New Products For Mail Order -- And Create Them!
I can't get to a professional camera store so I buy the new lens I need by mail -- for convenience.
Often the fastest, cheapest, simplest way to create a successful mail order ad is to rethink the product so that it becomes unique and more compelling.
Re-engineering a product usually costs less than paying for a string of test ads that bomb.
http://www.bio-byte.com/amos/10010.html

  
 byte order - OneLook Dictionary Search
We found one dictionary with English definitions that includes the word byte order :
Phrases that include byte order : network byte order, byte order mark
Tip: Click on the first link on a line below to go directly to a page where "byte order" is defined.
http://www.onelook.com/cgi-bin/cgiwrap/bware/dofind.cgi?word=byte+order

  
 Byte Order Macros
libjclass always converts everything to native byte order so you might not need these macros.
Byte Order Macros — A portable way to read big-endian integers.
Converts an unsigned 16-bit big-endian integer to the native byte order.
http://jclassinfo.sourceforge.net/api/jclass-types.html

  
 Byte order bug in token.c:send_deflated_token ?
write_batch_delta_file((char *)andn,sizeof(char)); temp_byte = (char)(n >> 8); write_batch_delta_file(andtemp_byte,sizeof(temp_byte)); Now on a little-endian machine andn will equal the address of the low-order byte of n, but on a big-endian machine, it'll equal the address of the high-order byte.
I was looking at send_deflated_token() when I noticed that it does int n, r;...
It looks like the upshot of this is that a batch delta file will be corrupted on a non-little-endian machine.
http://www.mail-archive.com/rsync@lists.samba.org/msg09089.html

  
 SecurityFocus HOME Mailing List: BugTraq
USER xxxxxxxxxxxx The command parameter "xxxxxxxxxxxx" will be copied to a 256 bytes buffer using strcpy().
Vulnerable Systems: * BlackJumboDog version 3.6.1 Immune Systems: * BlackJumboDog version 3.6.2 Impact: By sending a specially crafted FTP request containing a long parameter string in the USER, PASS, RETR, CWD, XMKD, XRMD or various other commands, a remote attacker could cause a stack overflow and execute arbitrary code.
Technical Details: This vulnerability is caused by an unsafe strcpy() that copies the entire parameter of the user's FTP command to a stack buffer of 256 bytes.
http://www.securityfocus.com/archive/1/374770

  
 4. Byte Order, Alignment, and Time Format
This byte order is commonly known as big-endian.
The transmission order is described in detail in [4].
All integer fields are carried in network byte order, that is, most significant byte (octet) first.
http://www.freesoft.org/CIE/RFC/1889/7.htm

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