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(*
Title: Standard Basis Library: Byte Structure and signature
Author: David Matthews
Copyright David Matthews 1999, 2005
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
under the terms of that licence.
*)
(* G&R 2004 status: Complete. *)
signature BYTE =
sig
val byteToChar : Word8.word -> char
val charToByte : char -> Word8.word
val bytesToString : Word8Vector.vector -> string
val stringToBytes : string -> Word8Vector.vector
val unpackStringVec : Word8VectorSlice.slice -> string
val unpackString : Word8ArraySlice.slice -> string
val packString : Word8Array.array * int * Substring.substring -> unit
end;
structure Byte: BYTE =
struct
(* Chars and Word8.word values are both tagged integers in the
range 0..255. *)
fun byteToChar (w: Word8.word): char = RunCall.unsafeCast w
fun charToByte (c: char) : Word8.word = RunCall.unsafeCast c
(* Conversion between Word8Vector.vector and string is just a cast. *)
fun bytesToString (LibrarySupport.Word8Array.Vector v) : string = LibrarySupport.Word8Array.toString v
fun stringToBytes (s: string) : Word8Vector.vector = LibrarySupport.Word8Array.Vector(LibrarySupport.Word8Array.fromString s)
fun unpackStringVec slice : string = bytesToString(Word8VectorSlice.vector slice)
fun unpackString slice : string = bytesToString(Word8ArraySlice.vector slice)
fun packString(array: Word8Array.array, i, s: substring) =
let
val (str, offset, size) = Substring.base s
val slice = Word8VectorSlice.slice(stringToBytes str, offset, SOME size)
in
Word8ArraySlice.copyVec{src=slice, dst=array, di=i}
end
end;
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