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Thus, for variant 1 (that is, most UUIDs) a random version 4 UUID will have 6 predetermined variant and version bits, leaving 122 bits for the randomly generated part, for a total of 2 122, or 5.3 × 10 36 (5.3 undecillion) possible version-4 variant-1 UUIDs. There are half as many possible version 4, variant 2 UUIDs (legacy GUIDs) because ...
Universally unique identifiers (UUID) consist of a 128-bit value. IPv6 routes computer network traffic amongst a 128-bit range of addresses. ZFS is a 128-bit file system. 128 bits is a common key size for symmetric ciphers and a common block size for block ciphers in cryptography. The IBM i Machine Interface defines all pointers as 128-bit. The ...
The tables below list the number of bytes per code point for different Unicode ranges. Any additional comments needed are included in the table. The figures assume that overheads at the start and end of the block of text are negligible. N.B. The tables below list numbers of bytes per code point, not per user visible "character" (or "grapheme ...
The intent of fsuid is to permit programs (e.g., the NFS server) to limit themselves to the file system rights of some given uid without giving that uid permission to send them signals. Since kernel 2.0, the existence of fsuid is no longer necessary because Linux adheres to SUSv3 rules for sending signals, but fsuid remains for compatibility ...
4 bytes: Revision number of header - 1.0 (00h 00h 01h 00h) for UEFI 2.10 12 (0x0C) 4 bytes: Header size in little endian (in bytes, usually 5Ch 00h 00h 00h or 92 bytes) 16 (0x10) 4 bytes: CRC32 of header (offset +0 to +0x5c) in little endian, with this field zeroed during calculation 20 (0x14) 4 bytes: Reserved; must be zero 24 (0x18) 8 bytes
For example, a kilobyte is actually 1024 bytes even though the standard meaning of kilo is 1000. And, mega normally means one million, but in computing is often used to mean 2 20 = 1 048 576. The table below illustrates the differences between normal metric sizes and the implied actual size – the binary size.
1: byte → value push a byte onto the stack as an integer value: breakpoint ca 1100 1010 reserved for breakpoints in Java debuggers; should not appear in any class file caload 34 0011 0100 arrayref, index → value load a char from an array castore 55 0101 0101 arrayref, index, value → store a char into an array checkcast c0 1100 0000
Only a small subset of possible byte strings are error-free UTF-8: several bytes cannot appear; a byte with the high bit set cannot be alone; and in a truly random string a byte with a high bit set has only a 1 ⁄ 15 chance of starting a valid UTF-8 character. This has the (possibly unintended) consequence of making it easy to detect if a ...