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de.ml
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module Bigarray = Bigarray_compat (* XXX(dinosaure): MirageOS compatibility. *)
type bigstring =
(char, Bigarray.int8_unsigned_elt, Bigarray.c_layout) Bigarray.Array1.t
(* XXX(dinosaure): prelude. *)
let invalid_arg fmt = Format.kasprintf invalid_arg fmt
let kstrf k fmt = Format.kasprintf k fmt
let bigstring_empty = Bigarray.Array1.create Bigarray.char Bigarray.c_layout 0
let bigstring_create l = Bigarray.Array1.create Bigarray.char Bigarray.c_layout l
let bigstring_length x = Bigarray.Array1.dim x [@@inline]
external swap : int -> int = "%bswap16"
external unsafe_get_uint8 : bigstring -> int -> int = "%caml_ba_ref_1"
external unsafe_get_char : bigstring -> int -> char = "%caml_ba_ref_1"
external unsafe_get_uint16 : bigstring -> int -> int = "%caml_bigstring_get16"
external unsafe_get_uint32 : bigstring -> int -> int32 = "%caml_bigstring_get32"
external string_unsafe_get_uint32 : string -> int -> int32 = "%caml_string_get32"
let string_unsafe_get_uint8 : string -> int -> int =
fun buf off -> Char.code (String.get buf off)
external bytes_unsafe_get_uint32 : bytes -> int -> int32 = "%caml_bytes_get32"
let bytes_unsafe_get_uint8 : bytes -> int -> int =
fun buf off -> Char.code (Bytes.get buf off)
external unsafe_set_uint8 : bigstring -> int -> int -> unit = "%caml_ba_set_1"
external unsafe_set_uint16 : bigstring -> int -> int -> unit = "%caml_bigstring_set16"
external unsafe_set_uint32 : bigstring -> int -> int32 -> unit = "%caml_bigstring_set32"
let bytes_unsafe_set_uint8 : bytes -> int -> int -> unit =
fun buf off v -> Bytes.set buf off (Char.unsafe_chr (v land 0xff))
external bytes_unsafe_set_uint32 : bytes -> int -> int32 -> unit = "%caml_bytes_set32"
(* XXX(dinosaure): little-endian only *)
let unsafe_set_uint16_le =
if not Sys.big_endian
then fun buf off v -> unsafe_set_uint16 buf off v
else fun buf off v -> unsafe_set_uint16 buf off (swap v)
let bigstring_to_string v =
let len = bigstring_length v in
let res = Bytes.create len in
let len0 = len land 3 in
let len1 = len asr 2 in
for i = 0 to len1 - 1
do
let i = i * 4 in
let v = unsafe_get_uint32 v i in
bytes_unsafe_set_uint32 res i v
done ;
for i = 0 to len0 - 1
do
let i = len1 * 4 + i in
let v = unsafe_get_uint8 v i in
bytes_unsafe_set_uint8 res i v
done ;
Bytes.unsafe_to_string res
let bigstring_of_string v =
let len = String.length v in
let res = bigstring_create len in
let len0 = len land 3 in
let len1 = len asr 2 in
for i = 0 to len1 - 1
do
let i = i * 4 in
let v = string_unsafe_get_uint32 v i in
unsafe_set_uint32 res i v
done ;
for i = 0 to len0 - 1
do
let i = len1 * 4 + i in
let v = string_unsafe_get_uint8 v i in
unsafe_set_uint8 res i v
done ; res
let[@inline always] is_power_of_two v = v <> 0 && v land (lnot v + 1) = v
let[@inline always] to_power_of_two v =
let res = ref (pred v) in
res := !res lor (!res lsr 1) ;
res := !res lor (!res lsr 2) ;
res := !res lor (!res lsr 4) ;
res := !res lor (!res lsr 8) ;
res := !res lor (!res lsr 16) ;
succ !res
let output_bigstring oc buf off len =
(* XXX(dinosaure): stupidly slow! *)
let v = Bigarray.Array1.sub buf off len in
let v = bigstring_to_string v in
output_string oc v
let input_bigstring ic buf off len =
let tmp = Bytes.create len in
let res = input ic tmp 0 len in
let len0 = res land 3 in
let len1 = res asr 2 in
for i = 0 to len1 - 1
do
let i = i * 4 in
let v = bytes_unsafe_get_uint32 tmp i in
unsafe_set_uint32 buf (off + i) v
done ;
for i = 0 to len0 - 1
do
let i = len1 * 4 + i in
let v = bytes_unsafe_get_uint8 tmp i in
unsafe_set_uint8 buf (off + i) v
done ; res
let invalid_bounds off len = invalid_arg "Out of bounds (off: %d, len: %d)" off len
let unsafe_blit src src_off dst dst_off len =
for i = 0 to len - 1
do unsafe_set_uint8 dst (dst_off + i) (unsafe_get_uint8 src (src_off + i)) done
let slow_blit2 src src_off dst0 dst0_off dst1 dst1_off len =
for i = 0 to len - 1
do
let v = unsafe_get_uint8 src (src_off + i) in
unsafe_set_uint8 dst0 (dst0_off + i) v ;
unsafe_set_uint8 dst1 (dst1_off + i) v ;
done
(* XXX(dinosaure): fast blit when it's possible. *)
let blit2 src src_off dst0 dst0_off dst1 dst1_off len =
if dst0_off - src_off < 4
then slow_blit2 src src_off dst0 dst0_off dst1 dst1_off len
else
let len0 = len land 3 in
let len1 = len asr 2 in
for i = 0 to len1 - 1
do
let i = i * 4 in
let v = unsafe_get_uint32 src (src_off + i) in
unsafe_set_uint32 dst0 (dst0_off + i) v ;
unsafe_set_uint32 dst1 (dst1_off + i) v ;
done ;
for i = 0 to len0 - 1
do
let i = len1 * 4 + i in
let v = unsafe_get_uint8 src (src_off + i) in
unsafe_set_uint8 dst0 (dst0_off + i) v ;
unsafe_set_uint8 dst1 (dst1_off + i) v ;
done
(* XXX(dinosaure): fast fill operation. (usually when [Match (len:?, dist:1)]) *)
let fill2 v dst0 dst0_off dst1 dst1_off len =
let len0 = len land 3 in
let len1 = len asr 2 in
let nv = Nativeint.of_int v in
let vv = Nativeint.(logor (shift_left nv 8) nv) in
let vvvv = Nativeint.(logor (shift_left vv 16) vv) in
let vvvv = Nativeint.to_int32 vvvv in
for i = 0 to len1 - 1
do
let i = i * 4 in
unsafe_set_uint32 dst0 (dst0_off + i) vvvv ;
unsafe_set_uint32 dst1 (dst1_off + i) vvvv
done ;
for i = 0 to len0 - 1
do
let i = len1 * 4 + i in
unsafe_set_uint8 dst0 (dst0_off + i) v ;
unsafe_set_uint8 dst1 (dst1_off + i) v
done
let io_buffer_size = 65536
(* XXX(dinosaure): Specialization. *)
external ( < ) : 'a -> 'a -> bool = "%lessthan"
external ( <= ) : 'a -> 'a -> bool = "%lessequal"
external ( >= ) : 'a -> 'a -> bool = "%greaterequal"
external ( > ) : 'a -> 'a -> bool = "%greaterthan"
let ( > ) (x : int) y = x > y [@@inline]
let ( < ) (x : int) y = x < y [@@inline]
let ( <= ) (x : int) y = x <= y [@@inline]
let ( >= ) (x : int) y = x >= y [@@inline]
let min (a : int) b = if a <= b then a else b [@@inline]
(* XXX(dinosaure): Constants. *)
let _max_bits = 15
let _smallest = 1
let _rep_3_6 = 16
let _repz_3_10 = 17
let _repz_11_138 = 18
let _literals = 256
let _length_codes = 29
let _l_codes = _literals + 1 + _length_codes
let _d_codes = 30
let _heap_size = 2 * _l_codes + 1
let _bl_codes = 19
let zigzag = [| 16; 17; 18; 0; 8; 7; 9; 6; 10; 5; 11; 4; 12; 3; 13; 2; 14; 1; 15 |]
let _length =
[| 0; 1; 2; 3; 4; 5; 6; 7; 8; 8; 9; 9; 10; 10; 11; 11; 12; 12; 12; 12; 13
; 13; 13; 13; 14; 14; 14; 14; 15; 15; 15; 15; 16; 16; 16; 16; 16; 16; 16
; 16; 17; 17; 17; 17; 17; 17; 17; 17; 18; 18; 18; 18; 18; 18; 18; 18; 19
; 19; 19; 19; 19; 19; 19; 19; 20; 20; 20; 20; 20; 20; 20; 20; 20; 20; 20
; 20; 20; 20; 20; 20; 21; 21; 21; 21; 21; 21; 21; 21; 21; 21; 21; 21; 21
; 21; 21; 21; 22; 22; 22; 22; 22; 22; 22; 22; 22; 22; 22; 22; 22; 22; 22
; 22; 23; 23; 23; 23; 23; 23; 23; 23; 23; 23; 23; 23; 23; 23; 23; 23; 24
; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24
; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 25; 25; 25; 25; 25
; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25
; 25; 25; 25; 25; 25; 25; 25; 25; 25; 26; 26; 26; 26; 26; 26; 26; 26; 26
; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26
; 26; 26; 26; 26; 26; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27
; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27
; 28 |]
let _distance code =
let t =
[| 0; 1; 2; 3; 4; 4; 5; 5; 6; 6; 6; 6; 7; 7; 7; 7; 8; 8; 8; 8; 8; 8; 8; 8
; 9; 9; 9; 9; 9; 9; 9; 9; 10; 10; 10; 10; 10; 10; 10; 10; 10; 10; 10; 10
; 10; 10; 10; 10; 11; 11; 11; 11; 11; 11; 11; 11; 11; 11; 11; 11; 11; 11
; 11; 11; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12
; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 12; 13; 13
; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13
; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 13; 14; 14; 14; 14; 14; 14
; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14
; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14
; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14; 14
; 14; 14; 14; 14; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15
; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15
; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15
; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 15; 0; 0; 16; 17
; 18; 18; 19; 19; 20; 20; 20; 20; 21; 21; 21; 21; 22; 22; 22; 22; 22; 22
; 22; 22; 23; 23; 23; 23; 23; 23; 23; 23; 24; 24; 24; 24; 24; 24; 24; 24
; 24; 24; 24; 24; 24; 24; 24; 24; 25; 25; 25; 25; 25; 25; 25; 25; 25; 25
; 25; 25; 25; 25; 25; 25; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26
; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26; 26
; 26; 26; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27
; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 27; 28; 28
; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28
; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28
; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28; 28
; 28; 28; 28; 28; 28; 28; 28; 28; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29
; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29
; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29
; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29; 29 |]
in
if code < 256 then t.(code) else t.(256 + (code lsr 7)) [@@inline]
let _base_length =
[| 0; 1; 2; 3; 4; 5; 6; 7; 8; 10; 12; 14; 16; 20; 24; 28; 32; 40; 48; 56; 64
; 80; 96; 112; 128; 160; 192; 224; 255; 0; 0 |]
(* assert (Array.length _base_length = 32) ;
XXX(dinosaure): in [zlib], [base_length] has 29 elements - however, it uses
the array only when it deflates something - it uses something else about
the inflation. We added two last [0] to avoid an [index out of bounds] where,
in some context, [_base_length] is used with input bits - finally, we can
mask input bits with [0x1f]. *)
let _extra_lbits =
[| 0; 0; 0; 0; 0; 0; 0; 0; 1; 1; 1; 1; 2; 2; 2; 2; 3; 3; 3; 3; 4; 4; 4; 4; 5
; 5; 5; 5; 0; 0; 0; 0 |]
let _extra_dbits =
[| 0; 0; 0; 0; 1; 1; 2; 2; 3; 3; 4; 4; 5; 5; 6; 6; 7; 7; 8; 8; 9; 9; 10; 10
; 11; 11; 12; 12; 13; 13; 0; 0 |]
(* assert (Array.length _extra_dbits = 32) ; *)
let _base_dist =
[| 0; 1; 2; 3; 4; 6; 8; 12; 16; 24; 32; 48; 64; 96; 128; 192; 256; 384; 512
; 768; 1024; 1536; 2048; 3072; 4096; 6144; 8192; 12288; 16384; 24576; (-1); (-1) |]
(* Window for end-user. *)
type window = bigstring
let make_window ~bits =
if bits >= 8 && bits <= 15 then bigstring_create (1 lsl 15)
else invalid_arg "bits MUST be between 8 and 15 (%d)" bits
let ffs n =
if n = 0 then invalid_arg "ffs on 0"
else
( let t = ref 1 in
let r = ref 0 in
while n land !t = 0 do t := !t lsl 1 ; incr r done
; !r )
let window_bits w = ffs (bigstring_length w)
module Lookup = struct
(* Used as inflate to store lookup.[bit-sequence] = [len << 15 | byte].
Used as deflate to store lookup.[byte] = [len << 15 | bit-sequence]. *)
type t =
{ t : int array
; m : int
; l : int }
let mask = (1 lsl _max_bits) - 1
let make t m = { t; m= (1 lsl m) - 1; l= m }
let get t i =
let v = t.t.(i) in v lsr _max_bits, v land mask (* allocation *)
[@@inline]
end
let _static_ltree =
[| (12, 8); (140, 8); (76, 8); (204, 8); (44, 8); (172, 8); (108, 8)
; (236, 8); (28, 8); (156, 8); (92, 8); (220, 8); (60, 8); (188, 8)
; (124, 8); (252, 8); (2, 8); (130, 8); (66, 8); (194, 8); (34, 8)
; (162, 8); (98, 8); (226, 8); (18, 8); (146, 8); (82, 8); (210, 8)
; (50, 8); (178, 8); (114, 8); (242, 8); (10, 8); (138, 8); (74, 8)
; (202, 8); (42, 8); (170, 8); (106, 8); (234, 8); (26, 8); (154, 8)
; (90, 8); (218, 8); (58, 8); (186, 8); (122, 8); (250, 8); (6, 8)
; (134, 8); (70, 8); (198, 8); (38, 8); (166, 8); (102, 8); (230, 8)
; (22, 8); (150, 8); (86, 8); (214, 8); (54, 8); (182, 8); (118, 8)
; (246, 8); (14, 8); (142, 8); (78, 8); (206, 8); (46, 8); (174, 8)
; (110, 8); (238, 8); (30, 8); (158, 8); (94, 8); (222, 8); (62, 8)
; (190, 8); (126, 8); (254, 8); (1, 8); (129, 8); (65, 8); (193, 8)
; (33, 8); (161, 8); (97, 8); (225, 8); (17, 8); (145, 8); (81, 8)
; (209, 8); (49, 8); (177, 8); (113, 8); (241, 8); (9, 8); (137, 8)
; (73, 8); (201, 8); (41, 8); (169, 8); (105, 8); (233, 8); (25, 8)
; (153, 8); (89, 8); (217, 8); (57, 8); (185, 8); (121, 8); (249, 8)
; (5, 8); (133, 8); (69, 8); (197, 8); (37, 8); (165, 8); (101, 8)
; (229, 8); (21, 8); (149, 8); (85, 8); (213, 8); (53, 8); (181, 8)
; (117, 8); (245, 8); (13, 8); (141, 8); (77, 8); (205, 8); (45, 8)
; (173, 8); (109, 8); (237, 8); (29, 8); (157, 8); (93, 8); (221, 8)
; (61, 8); (189, 8); (125, 8); (253, 8); (19, 9); (275, 9); (147, 9)
; (403, 9); (83, 9); (339, 9); (211, 9); (467, 9); (51, 9); (307, 9)
; (179, 9); (435, 9); (115, 9); (371, 9); (243, 9); (499, 9); (11, 9)
; (267, 9); (139, 9); (395, 9); (75, 9); (331, 9); (203, 9); (459, 9)
; (43, 9); (299, 9); (171, 9); (427, 9); (107, 9); (363, 9); (235, 9)
; (491, 9); (27, 9); (283, 9); (155, 9); (411, 9); (91, 9); (347, 9)
; (219, 9); (475, 9); (59, 9); (315, 9); (187, 9); (443, 9); (123, 9)
; (379, 9); (251, 9); (507, 9); (7, 9); (263, 9); (135, 9); (391, 9)
; (71, 9); (327, 9); (199, 9); (455, 9); (39, 9); (295, 9); (167, 9)
; (423, 9); (103, 9); (359, 9); (231, 9); (487, 9); (23, 9); (279, 9)
; (151, 9); (407, 9); (87, 9); (343, 9); (215, 9); (471, 9); (55, 9)
; (311, 9); (183, 9); (439, 9); (119, 9); (375, 9); (247, 9); (503, 9)
; (15, 9); (271, 9); (143, 9); (399, 9); (79, 9); (335, 9); (207, 9)
; (463, 9); (47, 9); (303, 9); (175, 9); (431, 9); (111, 9); (367, 9)
; (239, 9); (495, 9); (31, 9); (287, 9); (159, 9); (415, 9); (95, 9)
; (351, 9); (223, 9); (479, 9); (63, 9); (319, 9); (191, 9); (447, 9)
; (127, 9); (383, 9); (255, 9); (511, 9); (0, 7); (64, 7); (32, 7); (96, 7)
; (16, 7); (80, 7); (48, 7); (112, 7); (8, 7); (72, 7); (40, 7); (104, 7)
; (24, 7); (88, 7); (56, 7); (120, 7); (4, 7); (68, 7); (36, 7); (100, 7)
; (20, 7); (84, 7); (52, 7); (116, 7); (3, 8); (131, 8); (67, 8); (195, 8)
; (35, 8); (163, 8); (99, 8); (227, 8) |]
let _static_ltree =
let t = Array.map (fun (v, l) -> (l lsl _max_bits) lor v) _static_ltree in
Lookup.make t 9
let _static_dtree =
[| (0, 5); (16, 5); (8, 5); (24, 5); (4, 5); (20, 5); (12, 5); (28, 5)
; (2, 5); (18, 5); (10, 5); (26, 5); (6, 5); (22, 5); (14, 5); (30, 5)
; (1, 5); (17, 5); (9, 5); (25, 5); (5, 5); (21, 5); (13, 5); (29, 5)
; (3, 5); (19, 5); (11, 5); (27, 5); (7, 5); (23, 5) |]
let _static_dtree =
let t = Array.map (fun (v, l) -> (l lsl _max_bits) lor v) _static_dtree in
Lookup.make t 5
(* XXX(dinosaure): [zlib] raises "Invalid distance code" where it wants to
access to [base_dist.(30|31)]. It uses a smart mask to catch this behavior.
In this code, we did not raise an error nor /compromise/ output when we fall
to [Match (len:?, dist:0)] (so, nothing to do).
Case can be retrieved with "\x02\x7e\xff\xff". NOTE: [miniz] has this silent
behavior.
XXX(dinosaure): It's not true anymore where we decide to raise an error to
avoid an other error about access on window. It's explained below when we
have a [Write] operation. *)
type optint = Optint.t
(* XXX(dinosaure): optimize [Heap]. TODO! *)
module Heap = struct
type priority = int
type 'a queue = None | Node of priority * 'a * 'a queue * 'a queue
let rec push queue priority elt =
match queue with
| None -> Node (priority, elt, None, None)
| Node (p, e, left, right) ->
if priority <= p then Node (priority, elt, push right p e, left)
else Node (p, e, push right priority elt, left)
exception Empty
let rec remove = function
| None -> raise_notrace Empty
| Node (_, _, left, None) -> left
| Node (_, _, None, right) -> right
| Node
(_, _, (Node (lp, le, _, _) as left), (Node (rp, re, _, _) as right))
->
if lp <= rp then Node (lp, le, remove left, right)
else Node (rp, re, left, remove right)
let take = function
| None -> raise_notrace Empty
| Node (p, e, _, _) as queue -> (p, e, remove queue)
end
module WInf = struct
type t =
{ raw : bigstring
; mutable w : int
; mutable c : optint }
let max = 1 lsl 15
let mask = (1 lsl 15) - 1
let[@warning "-32"] make () =
{ raw= bigstring_create max
; w= 0
; c= Checkseum.Adler32.default }
let from raw =
{ raw; w= 0; c= Checkseum.Adler32.default }
let reset t =
t.w <- 0 ; t.c <- Checkseum.Adler32.default
let mask v = v land mask
[@@inline]
let update w =
let c = Checkseum.Adler32.unsafe_digest_bigstring w.raw 0 max w.c in
w.c <- c
let add t v =
unsafe_set_uint8 t.raw (mask t.w) v ;
if mask (t.w + 1) == 0 then update t ;
t.w <- t.w + 1
let sub a b = ( - ) a b
let compare a b =
(compare : int -> int -> int) (sub a min_int) (sub b min_int)
let have t =
if compare t.w max < 0 then t.w else max
(* XXX(dinosaure): a dragoon here. overflow can appear on [t.w] which only
increases. [compare] gives us a new chance to compare correctly [t.w] if it
overflows __one-time__. Then, for the second time, this code is broken. *)
let blit t w w_off o o_off len =
let msk = mask t.w in
let pre = max - msk in
let rst = len - pre in
if rst >= 0
then ( blit2 w w_off t.raw msk o o_off pre
; update t
; blit2 w (w_off + pre) t.raw 0 o (o_off + pre) rst )
else ( blit2 w w_off t.raw msk o o_off len
; if mask (t.w + len) == 0 && len > 0 then update t ) ;
t.w <- t.w + len
let fill t v o o_off len =
let msk = mask t.w in
let pre = max - msk in
let rst = len - pre in
if rst >= 0
then ( fill2 v t.raw msk o o_off pre
; update t
; fill2 v t.raw 0 o (o_off + pre) rst )
else ( fill2 v t.raw msk o o_off len
; if mask (t.w + len) == 0 && len > 0 then update t ) ;
t.w <- t.w + len
let tail w =
let msk = mask w.w in
if msk > 0
then ( let c = Checkseum.Adler32.unsafe_digest_bigstring w.raw 0 msk w.c in
w.w <- 0 ; (* XXX(dinosaure): reset! *)
w.c <- c )
let checksum w = w.c
end
module Inf = struct
(* à la dbuenzli *)
type src = [ `Channel of in_channel | `String of string | `Manual ]
type decode = [ `Await | `Flush | `End | `Malformed of string ]
exception Invalid_huffman
let prefix heap max =
assert (max < 16) ; (* allocation *)
let tbl = Array.make (1 lsl max) 0 in
let rec backward huff incr =
if huff land incr <> 0 then backward huff (incr lsr 1) else incr
in
let rec aux huff heap =
match Heap.take heap with
| _, (len, value), heap ->
let rec loop decr fill =
tbl.(huff + fill) <- (len lsl 15) lor value ;
if fill <> 0 then loop decr (fill - decr)
in
let decr = 1 lsl len in
loop decr ((1 lsl max) - decr) ;
let incr = backward huff (1 lsl (len - 1)) in
aux (if incr != 0 then (huff land (incr - 1)) + incr else 0) heap
| exception Heap.Empty -> ()
in
aux 0 heap ; tbl
type kind = CODES | LENS | DISTS
let empty_table =
[| 1 lsl _max_bits (* len: 1, val: 0 *) |], 1
let huffman kind table off codes =
let bl_count = Array.make 16 0 in
let max = ref 15 in
for sym = 0 to codes - 1 do
let p = table.(off + sym) in
bl_count.(p) <- bl_count.(p) + 1
done ;
(* XXX(dinosaure): check if we have an incomplete set for [LENS] and [DIST].
This code is ugly, TODO! *)
let exception Break in
( try while !max >= 1 do
if bl_count.(!max) != 0 then raise_notrace Break
; decr max done with Break -> () ) ;
if !max == 0 then empty_table
else
( let code = ref 0 in
let left = ref 1 in
let next_code = Array.make 16 0 in
for i = 1 to 15 do
left := !left lsl 1 ;
left := !left - bl_count.(i) ;
if !left < 0 then raise Invalid_huffman ;
code := (!code + bl_count.(i)) lsl 1 ;
next_code.(i) <- !code
done ;
if !left > 0 && (kind = CODES || !max != 1) then raise Invalid_huffman ;
let ordered = ref Heap.None in
let max = ref 0 in
for i = 0 to codes - 1 do
let l = table.(off + i) in
if l <> 0 then (
let n = next_code.(l - 1) in
next_code.(l - 1) <- n + 1 ;
ordered := Heap.push !ordered n (l, i) ; (* allocation *)
max := if l > !max then l else !max )
done ; (prefix !ordered !max, !max) (* allocation *) )
type decoder =
{ src : src
; mutable i : bigstring
; mutable i_pos : int
; mutable i_len : int
; mutable hold : int
; mutable bits : int
; mutable last : bool
; o : bigstring
; t : bigstring
; mutable t_need : int
; mutable t_len : int
; mutable o_pos : int
; mutable l : int (* literal / length *)
; mutable d : int (* distance *)
; mutable literal : Lookup.t
; mutable distance : Lookup.t
; mutable jump : jump
; w : WInf.t
; mutable s : state
; mutable k : decoder -> ret }
and state =
| Header
| Table of { hlit : int
; hdist : int
; hclen : int }
| Inflate_table of { t : int array
; l : int
; r : int array
; h : int * int * int }
| Inflate
| Slow
| Flat_header
| Dynamic_header
| Flat
| End_of_inflate
and jump = Length | Extra_length | Distance | Extra_distance | Write
and ret = Await | Flush | End | K | Malformed of string
let malformedf fmt = kstrf (fun s -> Malformed s) fmt
(* End of input [eoi] is signalled by [d.i_pos = 0] and [d.i_len = min_int]
which implies [i_rem d < 0] is [true]. *)
let eoi d =
d.i <- bigstring_empty ;
d.i_pos <- 0 ;
d.i_len <- min_int
let final _ = End
(* errors. *)
let err_unexpected_end_of_input d =
eoi d ; d.k <- final ;
malformedf "Unexpected end of input"
let err_invalid_kind_of_block d =
eoi d ; d.k <- final ;
malformedf "Invalid kind of block"
let err_invalid_dictionary d =
eoi d ; d.k <- final ;
malformedf "Invalid dictionary"
let err_invalid_complement_of_length d =
eoi d ; d.k <- final ;
malformedf "Invalid complement of length"
let err_invalid_distance d =
eoi d ; d.k <- final ;
malformedf "Invalid distance"
let err_invalid_distance_code d =
eoi d ; d.k <- final ;
malformedf "Invalid distance code"
(* remaining bytes to read [d.i]. *)
let i_rem d = d.i_len - d.i_pos + 1
[@@inline]
(* set [d.i] with [s]. *)
let src d s j l =
if (j < 0 || l < 0 || j + l > bigstring_length s)
then invalid_bounds j l ;
if (l == 0) then eoi d
else
( d.i <- s
; d.i_pos <- j
; d.i_len <- j + l - 1 )
(* get new input in [d.i] and [k]ontinue. *)
let refill k d = match d.src with
| `String _ ->
eoi d ; k d
| `Channel ic ->
let res = input_bigstring ic d.i 0 (bigstring_length d.i) in
src d d.i 0 res ; k d
| `Manual ->
d.k <- k ; Await
(* ensure to call [k] with, at least, [n] bits available. *)
let rec c_peek_bits n k d =
if d.bits >= n then k d
else
let rem = i_rem d in
if rem <= 0
then
if rem < 0 (* end of input *)
then err_unexpected_end_of_input d
else refill (c_peek_bits n k) d (* allocation *)
else
( let byte = unsafe_get_uint8 d.i d.i_pos in
d.i_pos <- d.i_pos + 1
; d.hold <- d.hold lor (byte lsl d.bits)
; d.bits <- d.bits + 8
; if d.bits >= n then k d else c_peek_bits n k d )
let t_need d n =
d.t_len <- 0 ; d.t_need <- n
let rec t_fill k d =
let blit d len =
unsafe_blit d.i d.i_pos d.t d.t_len len ;
d.i_pos <- d.i_pos + len ;
d.t_len <- d.t_len + len in
let rem = i_rem d in
if rem < 0 then k d (* TODO *)
else
let need = d.t_need - d.t_len in
if rem < need then ( blit d rem ; refill (t_fill k) d )
else ( blit d need ; d.t_need <- 0 ; k d )
let reverse_bits bits =
let t =
[| 0x00; 0x80; 0x40; 0xC0; 0x20; 0xA0; 0x60; 0xE0
; 0x10; 0x90; 0x50; 0xD0; 0x30; 0xB0; 0x70; 0xF0
; 0x08; 0x88; 0x48; 0xC8; 0x28; 0xA8; 0x68; 0xE8
; 0x18; 0x98; 0x58; 0xD8; 0x38; 0xB8; 0x78; 0xF8
; 0x04; 0x84; 0x44; 0xC4; 0x24; 0xA4; 0x64; 0xE4
; 0x14; 0x94; 0x54; 0xD4; 0x34; 0xB4; 0x74; 0xF4
; 0x0C; 0x8C; 0x4C; 0xCC; 0x2C; 0xAC; 0x6C; 0xEC
; 0x1C; 0x9C; 0x5C; 0xDC; 0x3C; 0xBC; 0x7C; 0xFC
; 0x02; 0x82; 0x42; 0xC2; 0x22; 0xA2; 0x62; 0xE2
; 0x12; 0x92; 0x52; 0xD2; 0x32; 0xB2; 0x72; 0xF2
; 0x0A; 0x8A; 0x4A; 0xCA; 0x2A; 0xAA; 0x6A; 0xEA
; 0x1A; 0x9A; 0x5A; 0xDA; 0x3A; 0xBA; 0x7A; 0xFA
; 0x06; 0x86; 0x46; 0xC6; 0x26; 0xA6; 0x66; 0xE6
; 0x16; 0x96; 0x56; 0xD6; 0x36; 0xB6; 0x76; 0xF6
; 0x0E; 0x8E; 0x4E; 0xCE; 0x2E; 0xAE; 0x6E; 0xEE
; 0x1E; 0x9E; 0x5E; 0xDE; 0x3E; 0xBE; 0x7E; 0xFE
; 0x01; 0x81; 0x41; 0xC1; 0x21; 0xA1; 0x61; 0xE1
; 0x11; 0x91; 0x51; 0xD1; 0x31; 0xB1; 0x71; 0xF1
; 0x09; 0x89; 0x49; 0xC9; 0x29; 0xA9; 0x69; 0xE9
; 0x19; 0x99; 0x59; 0xD9; 0x39; 0xB9; 0x79; 0xF9
; 0x05; 0x85; 0x45; 0xC5; 0x25; 0xA5; 0x65; 0xE5
; 0x15; 0x95; 0x55; 0xD5; 0x35; 0xB5; 0x75; 0xF5
; 0x0D; 0x8D; 0x4D; 0xCD; 0x2D; 0xAD; 0x6D; 0xED
; 0x1D; 0x9D; 0x5D; 0xDD; 0x3D; 0xBD; 0x7D; 0xFD
; 0x03; 0x83; 0x43; 0xC3; 0x23; 0xA3; 0x63; 0xE3
; 0x13; 0x93; 0x53; 0xD3; 0x33; 0xB3; 0x73; 0xF3
; 0x0B; 0x8B; 0x4B; 0xCB; 0x2B; 0xAB; 0x6B; 0xEB
; 0x1B; 0x9B; 0x5B; 0xDB; 0x3B; 0xBB; 0x7B; 0xFB
; 0x07; 0x87; 0x47; 0xC7; 0x27; 0xA7; 0x67; 0xE7
; 0x17; 0x97; 0x57; 0xD7; 0x37; 0xB7; 0x77; 0xF7
; 0x0F; 0x8F; 0x4F; 0xCF; 0x2F; 0xAF; 0x6F; 0xEF
; 0x1F; 0x9F; 0x5F; 0xDF; 0x3F; 0xBF; 0x7F; 0xFF |]
in t.(bits)
[@@inline]
let fixed_lit, fixed_dist =
let tbl_lit =
Array.init 288 @@ fun n ->
if n < 144 then 8
else if n < 256 then 9
else if n < 280 then 7
else 8 in
let tbl_dist =
let res = Array.make (1 lsl 5) 0 in
Array.iteri (fun i _ -> res.(i) <- (5 lsl 15) lor reverse_bits (i lsl 3)) res ;
res in
let tbl_lit, max_lit = huffman LENS tbl_lit 0 288 in
Lookup.make tbl_lit max_lit, Lookup.make tbl_dist 5
let checksum d =
WInf.checksum d.w
let rec flat d =
let len = min (min (i_rem d) d.l) (bigstring_length d.o - d.o_pos) in
WInf.blit d.w d.i d.i_pos d.o d.o_pos len ;
d.o_pos <- d.o_pos + len ;
d.i_pos <- d.i_pos + len ;
d.l <- d.l - len ;
if d.l == 0
then ( if d.last
then ( d.s <- End_of_inflate ; K )
else ( d.s <- Header ; K ) )
else match i_rem d, bigstring_length d.o - d.o_pos with
| 0, _ ->
( match d.src with
| `String _ -> eoi d ; err_unexpected_end_of_input d
| `Channel ic ->
let len = input_bigstring ic d.i 0 (bigstring_length d.i) in
src d d.i 0 len ; flat d (* XXX(dinosaure): check this branch. TODO! *)
| `Manual -> Await)
| _, 0 -> Flush
| _, _ -> assert false
let flat_header d =
let k d =
let t_pos = ref 0 in
let hold = ref d.hold in
let bits = ref d.bits in
let len = ref 0 and nlen = ref 0xffff in
let consume () =
if !bits < 8
then ( hold := ((unsafe_get_uint8 d.t !t_pos) lsl !bits) lor !hold
; bits := !bits + 8
; incr t_pos ) in
consume () ;
len := !hold land 0xff ;
hold := !hold asr 8 ;
bits := !bits - 8 ;
consume () ;
len := ((!hold land 0xff) lsl 8) lor !len ;
hold := !hold asr 8 ;
bits := !bits - 8 ;
consume () ;
nlen := !hold land 0xff ;
hold := !hold asr 8 ;
bits := !bits - 8;
consume () ;
nlen := ((!hold land 0xff) lsl 8) lor !nlen ;
hold := !hold asr 8 ;
bits := !bits - 8 ;
if !nlen != 0xffff - !len
then err_invalid_complement_of_length d
else ( d.hold <- 0 ; d.bits <- 0 ; d.l <- !len ; d.s <- Flat ; flat d ) in
d.hold <- d.hold asr (d.bits land 7) ;
(* XXX(cfcs): diff between [d.bits] and [d.bits round down to nearest multiple of 8]. *)
let truncated_bits = d.bits land (lnot 7) in
(* XXX(cfcs): round down to nearest multiple of 8, logical equivalents:
d.bits land (lnot (8 - 1))
d.bits land (lnot 7)
For some reason saving this variable locally instead of accessing [d.bits] twice
shaves off one instruction when compiling with [flambda]. *)
d.bits <- truncated_bits ;
let required = 4 - (truncated_bits asr 3) in
d.s <- Flat_header ;
t_need d required ; t_fill k d
let rec c_put_byte byte k d =
if d.o_pos < bigstring_length d.o
then ( unsafe_set_uint8 d.o d.o_pos byte
; WInf.add d.w byte
; d.o_pos <- d.o_pos + 1
; k d )
else ( d.k <- c_put_byte byte k (* allocation *)
; Flush )
let[@inline always] is_end_of_block lit d =
let rem = i_rem d in
lit.Lookup.t.(d.hold land lit.Lookup.m) land Lookup.mask == 256
&& lit.Lookup.t.(d.hold land lit.Lookup.m) lsr 15 <= d.bits
&& rem < 1
let slow_inflate lit dist jump d =
let rec c_peek_bits n k d =
if d.bits >= n then k d
else
let rem = i_rem d in
if rem <= 0
then
if rem < 0 (* end of input *)
then err_unexpected_end_of_input d
else refill (c_peek_bits n k) d (* allocation *)
else
( let byte = unsafe_get_uint8 d.i d.i_pos in
d.i_pos <- d.i_pos + 1
; d.hold <- d.hold lor (byte lsl d.bits)
; d.bits <- d.bits + 8
; if d.bits >= n || is_end_of_block lit d then k d else c_peek_bits n k d ) in
match jump with
| Length ->
let k d =
let value = lit.Lookup.t.(d.hold land lit.Lookup.m) land Lookup.mask in
let len = lit.Lookup.t.(d.hold land lit.Lookup.m) lsr 15 in
d.hold <- d.hold lsr len ;
d.bits <- d.bits - len ;
if value < 256
then
let k d =
d.s <- Inflate ; (* allocation *)
K in
c_put_byte value k d
else if value == 256
then ( if d.last
then ( d.s <- End_of_inflate ; K )
(* XXX(dinosaure): [K] is needed here to save remaining byte(s) correctly
in [End_of_inflate] state. *)
else ( d.s <- Header ; K ) )
else ( d.l <- value - 257
; d.jump <- Extra_length
; d.s <- Inflate (* allocation *)
; K ) in
(* XXX(dinosaure): this is necessary where [EOB] is not necessary the
longest code. So we can occur the case where we are at the end of the
input and have the [EOB] code, but not enough to have [lit.Lookup.l]
bits:
- previously, we just ask more input
- now, we check if [d.hold] is [EOB]: assumption, codes are prefix free
AND we reach end of input.
TODO: optimize this branch! *)
if is_end_of_block lit d
then k d
else c_peek_bits lit.Lookup.l k d
| Extra_length ->
let len = _extra_lbits.(d.l) in
let k d =
let extra = d.hold land ((1 lsl len) - 1) in
d.hold <- d.hold lsr len ;
d.bits <- d.bits - len ;
d.l <- _base_length.(d.l land 0x1f) + 3 + extra ;
d.jump <- Distance ;
d.s <- Inflate ; (* allocation *)
K in
c_peek_bits len k d
| Distance ->
let k d =
let value = dist.Lookup.t.(d.hold land dist.Lookup.m) land Lookup.mask in
let len = dist.Lookup.t.(d.hold land dist.Lookup.m) lsr 15 in
d.hold <- d.hold lsr len ;
d.bits <- d.bits - len ;
d.d <- value ;
d.jump <- Extra_distance ;
d.s <- Inflate ; (* allocation *)
K in
c_peek_bits dist.Lookup.l k d
| Extra_distance ->
let len = _extra_dbits.(d.d land 0x1f) in
let k d =
let extra = d.hold land ((1 lsl len) - 1) in
d.hold <- d.hold lsr len ;
d.bits <- d.bits - len ;
d.d <- _base_dist.(d.d) + 1 + extra ;
d.jump <- Write ;
d.s <- Inflate ; (* allocation *)
K in
c_peek_bits len k d
| Write ->
if d.d == 0
then err_invalid_distance_code d
else if d.d > WInf.have d.w
then err_invalid_distance d
else
let len = min d.l (bigstring_length d.o - d.o_pos) in
let off = WInf.mask (d.w.WInf.w - d.d) in
let pre = WInf.max - off in
let rst = len - pre in
if rst > 0
then ( WInf.blit d.w d.w.WInf.raw off d.o d.o_pos pre
; WInf.blit d.w d.w.WInf.raw 0 d.o (d.o_pos + pre) rst )
else WInf.blit d.w d.w.WInf.raw off d.o d.o_pos len ;
d.o_pos <- d.o_pos + len ;
if d.l - len == 0
then ( d.jump <- Length
; d.s <- Inflate (* allocation *)
; K )
else ( d.l <- d.l - len
; d.s <- Inflate (* allocation *)
; Flush )
let inflate lit dist jump d =
let exception End in
let exception Invalid_distance in
let exception Invalid_distance_code in
let hold = ref (Nativeint.of_int d.hold) in
let bits = ref d.bits in
let jump = ref jump in
let i_pos = ref d.i_pos in
let o_pos = ref d.o_pos in
let lit_mask = Nativeint.of_int lit.Lookup.m in
let dist_mask = Nativeint.of_int dist.Lookup.m in
(* XXX(dinosaure): 2 jumps were done in this hot-loop:
1- [while],
2- [match .. with]).
A [let rec length = .. and extra_length = ..] can be optimized by
[flambda]. We should replace [match .. with] by this design. TODO. *)
try while d.i_len - !i_pos + 1 > 1
&& !o_pos < bigstring_length d.o
do match !jump with
| Length ->
if !bits < lit.Lookup.l
then ( hold := Nativeint.logor !hold Nativeint.(shift_left (of_int (unsafe_get_uint8 d.i !i_pos)) !bits)
; bits := !bits + 8