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(* Word8 -- SML Basis Library *) type word = word8 val wordSize : int val orb : word * word -> word val andb : word * word -> word val xorb : word * word -> word val notb : word -> word val << : word * Word.word -> word val >> : word * Word.word -> word val ~>> : word * Word.word -> word val + : word * word -> word val - : word * word -> word val * : word * word -> word val div : word * word -> word val mod : word * word -> word val > : word * word -> bool val < : word * word -> bool val >= : word * word -> bool val <= : word * word -> bool val compare : word * word -> order val min : word * word -> word val max : word * word -> word val toString : word -> string val fromString : string -> word option val scan : StringCvt.radix -> (char, 'a) StringCvt.reader -> (word, 'a) StringCvt.reader val fmt : StringCvt.radix -> word -> string val toInt : word -> int val toIntX : word -> int (* with sign extension *) val fromInt : int -> word val toLargeInt : word -> int val toLargeIntX : word -> int (* with sign extension *) val fromLargeInt : int -> word val toLargeWord : word -> Word.word val toLargeWordX : word -> Word.word (* with sign extension *) val fromLargeWord : Word.word -> word (* [word] is the type of 8-bit words, or 8-bit unsigned integers in the range 0..255. [wordSize] equals 8. [orb(w1, w2)] returns the bitwise `or' of w1 and w2. [andb(w1, w2)] returns the bitwise `and' of w1 and w2. [xorb(w1, w2)] returns the bitwise `exclusive or' or w1 and w2. [notbw] returns the bitwise negation of w. [<<(w, k)] returns the word resulting from shifting w left by k bits. The bits shifted in are zero, so this is a logical shift. Consequently, the result is 0-bits when k >= wordSize. [>>(w, k)] returns the word resulting from shifting w right by k bits. The bits shifted in are zero, so this is a logical shift. Consequently, the result is 0-bits when k >= wordSize. [~>>(w, k)] returns the word resulting from shifting w right by k bits. The bits shifted in are replications of the left-most bit: the `sign bit', so this is an arithmetical shift. Consequently, for k >= wordSize and wordToInt w >= 0 the result is all 0-bits, and for k >= wordSize and wordToInt w < 0 the result is all 1-bits. To make <<, >>, and ~>> infix, use the declaration: infix 5 << >> ~>> [+] [-] [*] [div] [mod] represent unsigned integer addition, subtraction, multiplication, division, and remainder, modulus 256. The operations (i div j) and (i mod j) raise Div when j = 0. Otherwise no exceptions are raised. [<] [<=] [>] [>=] compare words as unsigned integers. [compare(w1, w2)] returns LESS, EQUAL, or GREATER, according as w1 is less than, equal to, or greater than w2 (as unsigned integers). [min(w1, w2)] returns the smaller of w1 and w2 (as unsigned integers). [max(w1, w2)] returns the larger of w1 and w2 (as unsigned integers). [fmtradix w] returns a string representing w, in the radix (base) specified by radix. radix description output format ------------------------------------------------------ BIN unsigned binary (base 2) [01]+ OCT unsigned octal (base 8) [0-7]+ DEC unsigned decimal (base 10) [0-9]+ HEX unsigned hexadecimal (base 16) [0-9A-F]+ [toStringw] returns a string representing w in unsigned hexadecimal format. Equivalent to (fmt HEX w). [fromStrings] returns SOME(w) if a hexadecimal unsigned numeral can be scanned from a prefix of string s, ignoring any initial whitespace; returns NONE otherwise. Raises Overflow if the scanned number cannot be represented as a word. An unsigned hexadecimal numeral must have form, after possible initial whitespace: [0-9a-fA-F]+ [scanradix {getc} charsrc] attempts to scan an unsigned numeral from the character source charsrc, using the accessor getc, and ignoring any initial whitespace. The radix argument specifies the base of the numeral (BIN, OCT, DEC, HEX). If successful, it returns SOME(w, rest) where w is the value of the numeral scanned, and rest is the unused part of the character source. Raises Overflow if the scanned number cannot be represented as a word. A numeral must have form, after possible initial whitespace: radix input format ------------------------------------- BIN (0w)?[0-1]+ OCT (0w)?[0-7]+ DEC (0w)?[0-9]+ HEX (0wx|0wX|0x|0X)?[0-9a-fA-F]+ [toIntw] returns the integer in the range 0..255 represented by w. [toIntXw] returns the signed integer (in the range ~128..127) represented by bit-pattern w. [fromInti] returns the word holding the 8 least significant bits of i. [toLargeIntw] returns the integer in the range 0..255 represented by w. [toLargeIntXw] returns the signed integer (in the range ~128..127) represented by bit-pattern w. [fromLargeInti] returns the word holding the 8 least significant bits of i. [toLargeWordw] returns the Word.word value corresponding to w. [toLargeWordXw] returns the Word.word value corresponding to w, with sign extension. That is, the 8 least significant bits of the result are those of w, and the remaining bits are all equal to the most significant bit of w: its `sign bit'. [fromLargeWordw] returns w modulo 256. *)

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