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ReadFile.sml
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ReadFile.sml
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(** Copyright (c) 2023 Sam Westrick
*
* See the file LICENSE for details.
*)
structure ReadFile:
sig
type 'a seq = 'a ArraySlice.slice
val contentsSeq: string -> char seq
val contentsBinSeq: string -> Word8.word seq
val contents: string -> string
end =
struct
type 'a seq = 'a ArraySlice.slice
fun contentsSeq' (default, readByte: Word8.word -> 'a) path =
let
val (file, length) =
let
open Posix.FileSys
val file = openf (path, O_RDONLY, O.fromWord 0w0)
in
(file, Position.toInt (ST.size (fstat file)))
end
open Posix.IO
val bufferSize = 10000
val buffer = Word8Array.array (bufferSize, 0w0)
val result = Array.array (length, default)
fun copyToResult i n =
Word8ArraySlice.appi
(fn (j, b) => Array.update (result, i + j, readByte b))
(Word8ArraySlice.slice (buffer, 0, SOME n))
fun dumpFrom i =
if i >= length then
()
else
let val bytesRead = readArr (file, Word8ArraySlice.full buffer)
in copyToResult i bytesRead; dumpFrom (i + bytesRead)
end
in
dumpFrom 0;
close file;
ArraySlice.full result
end
fun contentsSeq path =
contentsSeq' (Char.chr 0, Char.chr o Word8.toInt) path
fun contentsBinSeq path =
contentsSeq' (0w0, fn w => w) path
fun contents filename =
let
val chars = contentsSeq filename
in
CharVector.tabulate (ArraySlice.length chars, fn i =>
ArraySlice.sub (chars, i))
end
end