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type decode = [ `Data of string | `Await | `End | `CRLF | `Spaces of string ]
type decoder = {
mutable i : bytes;
mutable i_pos : int;
mutable i_len : int;
mutable has_cr : bool;
b : Buffer.t;
mutable k : decoder -> decode;
}
let i_rem d = d.i_len - d.i_pos + 1
let end_of_input d =
d.i <- Bytes.empty ;
d.i_pos <- 0 ;
d.i_len <- min_int
let src decoder source off len =
if off < 0 || len < 0 || off + len > Bytes.length source
then Fmt.invalid_arg "Invalids bounds"
else if len = 0
then end_of_input decoder
else (
decoder.i <- source ;
decoder.i_pos <- off ;
decoder.i_len <- off + len - 1)
let ret k v decoder =
decoder.k <- k ;
v
let rec t_end decoder =
decoder.k <- t_end ;
`End
and t_space j decoder =
let idx = ref j in
let chr = ref '\000' in
while
decoder.i_len - !idx >= 0
&&
(chr := Bytes.get decoder.i !idx ;
!chr = ' ' || !chr = '\t')
do
incr idx
done ;
let i = decoder.i_pos in
let s = Bytes.sub_string decoder.i i (j - i) in
let s = if decoder.has_cr then "\r" ^ s else s in
let n = Bytes.sub_string decoder.i j (!idx - j) in
Buffer.add_string decoder.b n ;
decoder.has_cr <- false ;
decoder.i_pos <- !idx ;
if String.length s = 0
then t_decode decoder
else
ret
(fun decoder ->
let s = Buffer.contents decoder.b in
Buffer.clear decoder.b ;
ret t_decode (`Spaces s) decoder)
(`Data s) decoder
and t_space_data_space j decoder =
if Buffer.length decoder.b > 0 && j - decoder.i_pos > 0 && not decoder.has_cr
then (
let s = Buffer.contents decoder.b in
Buffer.clear decoder.b ;
ret (t_space j) (`Spaces s) decoder)
else t_space j decoder
and t_space_or k v decoder =
if Buffer.length decoder.b > 0
then (
let s = Buffer.contents decoder.b in
Buffer.clear decoder.b ;
ret (ret k v) (`Spaces s) decoder)
else ret k v decoder
and t_decode decoder =
let rem = i_rem decoder in
if rem <= 0
then
if rem < 0
then
if decoder.has_cr
then t_space_or t_end (`Data "\r") decoder
else t_space_or t_end `End decoder
else `Await
else
match decoder.has_cr with
| true ->
if Bytes.get decoder.i decoder.i_pos = '\n'
then (
decoder.i_pos <- decoder.i_pos + 1 ;
decoder.has_cr <- false ;
t_space_or t_decode `CRLF decoder)
else
let idx = ref decoder.i_pos in
let chr = ref '\000' in
while
decoder.i_len - !idx >= 0
&&
(chr := Bytes.get decoder.i !idx ;
!chr <> '\r' && !chr <> ' ' && !chr <> '\t')
do
incr idx
done ;
if !chr = '\r'
then (
let j = decoder.i_pos in
decoder.i_pos <- !idx + 1 ;
let s = Bytes.sub_string decoder.i j (!idx - j) in
let s = "\r" ^ s in
decoder.has_cr <- true ;
t_space_or t_decode (`Data s) decoder)
else if !chr = ' ' || !chr = '\t'
then t_space_data_space !idx decoder
else
let j = decoder.i_pos in
decoder.i_pos <- !idx + 1 ;
let s = Bytes.sub_string decoder.i j (!idx + 1 - j) in
let s = "\r" ^ s in
decoder.has_cr <- false ;
t_space_or t_decode (`Data s) decoder
| false ->
let idx = ref decoder.i_pos in
let chr = ref '\000' in
while
decoder.i_len - !idx >= 0
&&
(chr := Bytes.get decoder.i !idx ;
!chr <> '\r' && !chr <> ' ' && !chr <> '\t')
do
incr idx
done ;
if !chr = '\r'
then (
let j = decoder.i_pos in
decoder.i_pos <- !idx + 1 ;
let s = Bytes.sub_string decoder.i j (!idx - j) in
decoder.has_cr <- true ;
if s = ""
then t_decode decoder
else t_space_or t_decode (`Data s) decoder)
else if !chr = ' ' || !chr = '\t'
then t_space_data_space !idx decoder
else
let j = decoder.i_pos in
decoder.i_pos <- !idx ;
let s = Bytes.sub_string decoder.i j (!idx - j) in
decoder.has_cr <- false ;
if s = ""
then t_decode decoder
else t_space_or t_decode (`Data s) decoder
let decode decoder = decoder.k decoder
let decoder () =
{
i = Bytes.empty;
i_pos = 1;
i_len = 0;
has_cr = false;
b = Buffer.create 0x7ff;
k = t_decode;
}