![]() ![]() Most of the confusion lies with little-endian and so we’ll start there.Īs a reminder, little-endianness refers to the byte ordering where the least significant byte is stored first. This means that in order for you to use the Internet, your computer has to account for the difference in endianness. In the end, that is why endianness is important because not knowing how data is stored would lead to communicating different values.įor example, all x86_64 processors (Intel/AMD) use little-endian while IP/TCP uses big-endian. 78 56 34 12Īnd if we were to store it in big-endian we would get: 12 34 56 78 Note that each 2 hex letters represent 1 byte. If we were to store the previously mentioned value into memory using little-endian we would get the following. However, if we were talking about storing this 4-byte value into memory, then and only then would we have to specify endianness. Why This Is Important?Īn important distinction to make about endianness is that it only refers to how values are stored in memory and not how we deal with values for example, 0x12345678 is still 0x12345678. This article will only talk about endianness when it comes to integer numbers and not floating point numbers, as it gets a lot more complicated and way less defined. In a sense, big-endian is the “normal” way to write things down. 0x12345678, we write it with the most significant byte first (the 12 part). Specifically, little-endian is when the least significant bytes are stored before the more significant bytes, and big-endian is when the most significant bytes are stored before the less significant bytes. This is called endianness and it refers to the ordering of the bytes. One thing that is often overlooked is the formatting at the byte level of this data. Here's the source: #include įILE* file = fopen( "struct-dump", "w" ) įwrite(
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