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|
signature GZIP = sig
exception Failure
val openIn: string -> TextIO.instream
val openOut: string -> TextIO.outstream
end
structure Gzip :> GZIP = struct
structure Primitive :> sig
eqtype gzFile
val null: gzFile
val gzopen: string * string -> gzFile
val gzread: gzFile * CharArray.array * word * word -> int
val gzwritea: gzFile * CharArray.array * word * word -> int
val gzwritev: gzFile * CharVector.vector * word * word -> int
val gzclose: gzFile -> int
end = struct
type gzFile = MLton.Pointer.t
val null = MLton.Pointer.null
val gzopen = _import "gzopen": string * string -> gzFile;
val gzread = _import "gzreadoffset":
gzFile * CharArray.array * word * word -> int;
val gzwritea = _import "gzwriteoffset":
gzFile * CharArray.array * word * word -> int;
val gzwritev = _import "gzwriteoffset":
gzFile * CharVector.vector * word * word -> int;
val gzclose = _import "gzclose": gzFile -> int;
end
exception Failure
fun readArraySlice (g, slice) =
let
val (array, offset, length) = CharArraySlice.base slice
val wordoffset = Word.fromInt offset
val wordlength = Word.fromInt length
in
Primitive.gzread (g, array, wordoffset, wordlength)
end
fun readerFromPrimitive (name, g) =
let
val closed = ref false
fun error x = raise IO.Io {
name = name
, function = "readArr"
, cause = x
}
fun readArr slice =
if !closed then error IO.ClosedStream
else let
val r = readArraySlice (g, slice)
in
if r < 0 then error Failure
else r
end
fun close () =
if !closed then ()
else (
closed := true
; ignore (Primitive.gzclose g)
)
in
TextPrimIO.augmentReader (TextPrimIO.RD {
name = name
, chunkSize = 32 * 1024
, readVec = NONE
, readArr = SOME readArr
, readVecNB = NONE
, readArrNB = NONE
, block = NONE
, canInput = NONE
, avail = fn () => NONE
, getPos = NONE
, setPos = NONE
, endPos = NONE
, verifyPos = NONE
, close = close
, ioDesc = NONE
})
end
fun readerFromName name =
let
val path = name ^ "\000"
val g = Primitive.gzopen (path, "r\000")
in
if g = Primitive.null then NONE
else SOME (readerFromPrimitive (name, g))
end
fun openIn name =
case readerFromName name of
SOME x => TextIO.mkInstream (TextIO.StreamIO.mkInstream (x, ""))
| NONE => raise IO.Io {
name = name
, function = "openIn"
, cause = Failure
}
fun writeSlice (base, write) (g, slice) =
let
val (vector, offset, length) = base slice
val wordoffset = Word.fromInt offset
val wordlength = Word.fromInt length
in
write (g, vector, wordoffset, wordlength)
end
val writeVectorSlice = writeSlice (CharVectorSlice.base, Primitive.gzwritev)
val writeArraySlice = writeSlice (CharArraySlice.base, Primitive.gzwritea)
fun writerFromPrimitive (name, g) =
let
val closed = ref false
fun error (function, x) = raise IO.Io {
name = name
, function = function
, cause = x
}
fun close () =
if !closed then ()
else (
closed := true
; ignore (Primitive.gzclose g)
)
fun write (name, realWrite) slice =
if !closed then error (name, IO.ClosedStream)
else let
val r = realWrite (g, slice)
in
if r <= 0 then error (name, Failure)
else r
end
val writeVec = write ("writeVec", writeVectorSlice)
val writeArr = write ("writeArr", writeArraySlice)
in
TextPrimIO.augmentWriter (TextPrimIO.WR {
name = name
, chunkSize = 32 * 1024
, writeVec = SOME writeVec
, writeArr = SOME writeArr
, writeVecNB = NONE
, writeArrNB = NONE
, block = NONE
, canOutput = NONE
, getPos = NONE
, setPos = NONE
, endPos = NONE
, verifyPos = NONE
, close = close
, ioDesc = NONE
})
end
fun writerFromName name =
let
val path = name ^ "\000"
val g = Primitive.gzopen (path, "w9")
in
if g = Primitive.null then NONE
else SOME (writerFromPrimitive (name, g))
end
fun openOut name =
case writerFromName name of
SOME x => TextIO.mkOutstream (TextIO.StreamIO.mkOutstream (x, IO.NO_BUF))
| NONE => raise IO.Io {
name = name
, function = "openOut"
, cause = Failure
}
end
|
