Swap two nibbles in a byte - FIRMWARE DEVELOPER.
General description. The swab() function copies nbytes bytes, which are pointed to by src to the object pointed to by dest, exchanging adjacent bytes.The nbytes argument should be even. If nbytes is odd, swab() copies and exchanges nbytes-1 bytes and the disposition of the last byte is left unchanged in the target area.If nbytes is zero or negative, no copying is performed.
The return value of open() is a file descriptor, a small, nonnegative integer that is used in subsequent system calls (read(2), write(2), lseek(2), fcntl(2), etc.) to refer to the open file. The file descriptor returned by a successful call will be the lowest-numbered file descriptor not currently open for the process. By default, the new file.
This explicit signature allows a TIFF reader program to swap bytes if necessary when a given file was generated by a TIFF writer program running on a computer with a different endianness. Since the required byte swap depends on the size of the numbers stored in the file (two 2-byte integers require a different swap than one 4-byte integer), the file format must be known to perform endianness.
Generic swap is a task which brings together a few separate issues in programming language semantics. Dynamically typed languages deal with values in a generic way quite readily, but do not necessarily make it easy to write a function to destructively swap two variables, because this requires indirection upon storage places or upon the syntax designating storage places.
Writing to video memory. For most things to do with graphics, we need to write to video memory, so learning how to do it is one of the basic steps you need to learn. This page explains that, and other pages will refer here in case you need it later. What we need; Setting the address. Fixed addresses; Variable addresses. Writing the data. What we need. Before we begin, we need some of the.
You can use the Put statement to write a Variantarray to disk, but you can't use Put to write a scalar Variant containing an array to disk. You also can't use Put to write objects to disk. If the variable being written is a Variant of VarType 8 (String), Put writes 2 bytes identifying the VarType, 2 bytes indicating the length of the string, and then writes the string data. The record length.
I'm developing a file format (mdd specification) which is a binary format.The spec calls for the data to be writtin in Big Endian order. I've found a ton of resources explaining the difference between big and little endian which has helped me understand what this is.