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pbrt.ml
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(* Copyright (c) 2014 Peter Zotov <whitequark@whitequark.org> Copyright (c) 2016 Maxime Ransan <maxime.ransan@gmail.com> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *) type payload_kind = | Varint | Bits32 | Bits64 | Bytes let min_int_as_int32, max_int_as_int32 = Int32.of_int min_int, Int32.of_int max_int let min_int_as_int64, max_int_as_int64 = Int64.of_int min_int, Int64.of_int max_int module Decoder = struct type error = | Incomplete | Overlong_varint | Malformed_field | Overflow of string | Unexpected_payload of string * payload_kind | Missing_field of string | Malformed_variant of string let error_to_string e = match e with | Incomplete -> "Incomplete" | Overlong_varint -> "Overlong_varint" | Malformed_field -> "Malformed_field" | Overflow fld -> Printf.sprintf "Overflow(%S)" fld | Unexpected_payload (field, kind) -> let kind' = match kind with | Varint -> "Varint" | Bits32 -> "Bits32" | Bits64 -> "Bits64" | Bytes -> "Bytes" in Printf.sprintf "Unexpected_payload(%S, %s)" field kind' | Missing_field field -> Printf.sprintf "Missing_field(%S)" field | Malformed_variant name -> Printf.sprintf "Malformed_variant(%S)" name exception Failure of error let () = Printexc.register_printer (fun exn -> match exn with | Failure e -> Some (Printf.sprintf "Pbrt.Decoder.Failure(%s)" (error_to_string e)) | _ -> None) type t = { source: bytes; limit: int; mutable offset: int; } let of_bytes source = { source; offset = 0; limit = Bytes.length source } let of_subbytes source offset len = if offset + len > Bytes.length source then invalid_arg "Pbrt.Decoder.of_subbypes"; { source; offset; limit = offset + len } let of_string source = (* safe: we won't modify the bytes *) of_bytes (Bytes.unsafe_of_string source) let of_substring source offset len = of_subbytes (Bytes.unsafe_of_string source) offset len let malformed_variant variant_name = raise (Failure (Malformed_variant variant_name)) let unexpected_payload field_name pk = raise (Failure (Unexpected_payload (field_name, pk))) let[@inline never] missing_field field_name = raise (Failure (Missing_field field_name)) let[@inline never] incomplete () = raise (Failure Incomplete) let at_end d = d.limit = d.offset let[@inline] byte d = if d.offset >= d.limit then incomplete (); let byte = int_of_char (Bytes.get d.source d.offset) in d.offset <- d.offset + 1; byte let[@inline] bool_of_int64 fld v = if v = Int64.zero then false else if v = Int64.one then true else raise (Failure (Overflow fld)) let int_of_int32 fld v = if Sys.word_size = 32 && (v < min_int_as_int32 || v > max_int_as_int32) then raise (Failure (Overflow fld)) else Int32.to_int v let[@inline] int_of_int64 fld v = if v < min_int_as_int64 || v > max_int_as_int64 then raise (Failure (Overflow fld)) else Int64.to_int v let varint d : int64 = let shift = ref 0 in let res = ref 0L in let continue = ref true in while !continue do let b = byte d in let cur = b land 0x7f in if cur <> b then ( (* at least one byte follows this one *) (res := Int64.(logor !res (shift_left (of_int cur) !shift))); shift := !shift + 7 ) else if !shift < 63 || b land 0x7f <= 1 then ( (res := Int64.(logor !res (shift_left (of_int b) !shift))); continue := false ) else raise (Failure Overlong_varint) done; !res let zigzag d : int64 = let v = (varint [@inlined]) d in Int64.(logxor (shift_right v 1) (neg (logand v Int64.one))) let[@inline] bits32 d = if d.offset + 4 > d.limit then incomplete (); let x = Bytes.get_int32_le d.source d.offset in d.offset <- d.offset + 4; x let[@inline] bits64 d = if d.offset + 8 > d.limit then incomplete (); let x = Bytes.get_int64_le d.source d.offset in d.offset <- d.offset + 8; x let int_as_varint d = Int64.to_int @@ (varint [@inlined]) d let bytes d = (* strings are always shorter than range of int *) let len = int_as_varint d in if d.offset + len > d.limit then raise (Failure Incomplete); let str = Bytes.sub d.source d.offset len in d.offset <- d.offset + len; str let nested d = (* strings are always shorter than range of int *) let len = int_as_varint d in if d.offset + len > d.limit then raise (Failure Incomplete); let d' = { d with limit = d.offset + len } in d.offset <- d.offset + len; d' let key d = if d.offset = d.limit then None else ( (* keys are always in the range of int, * but prefix might only fit into int32 *) let prefix = (varint [@inlined]) d in let key, ty = Int64.(to_int (shift_right prefix 3)), Int64.logand 0x7L prefix in match ty with | 0L -> Some (key, Varint) | 1L -> Some (key, Bits64) | 2L -> Some (key, Bytes) | 5L -> Some (key, Bits32) | _ -> raise (Failure Malformed_field) ) let skip d kind = let skip_len n = if d.offset + n > d.limit then raise (Failure Incomplete) else d.offset <- d.offset + n in let rec skip_varint () = let b = byte d in if b land 0x80 <> 0 then skip_varint () else () in match kind with | Bits32 -> skip_len 4 | Bits64 -> skip_len 8 (* strings are always shorter than range of int *) | Bytes -> skip_len (int_as_varint d) | Varint -> skip_varint () let map_entry d ~decode_key ~decode_value = let d = nested d in let key_v = ref None in let value_v = ref None in let rec loop () = match key d with | None -> () | Some (1, _) -> key_v := Some (decode_key d); loop () | Some (2, _) -> value_v := Some (decode_value d); loop () | Some (_, pk) -> skip d pk; loop () in loop (); match !key_v, !value_v with | Some key, Some value -> key, value | _ -> failwith "Missing key or value for map entry" let empty_nested d = let len = int_as_varint d in if len <> 0 then raise (Failure Incomplete) else () let packed_fold f e0 d = let d' = nested d in let rec loop acc = if at_end d' then acc else loop (f acc d') in loop e0 let[@inline] int_as_zigzag d = Int64.to_int @@ (zigzag [@inlined]) d let[@inline] int32_as_varint d = Int64.to_int32 ((varint [@inlined]) d) let[@inline] int32_as_zigzag d = Int64.to_int32 ((zigzag [@inlined]) d) let int64_as_varint = varint let int64_as_zigzag = zigzag let int32_as_bits32 = bits32 let int64_as_bits64 = bits64 let[@inline] uint32_as_varint d = `unsigned (int32_as_varint d) let[@inline] uint32_as_zigzag d = `unsigned (int32_as_zigzag d) let[@inline] uint64_as_varint d = `unsigned (varint d) let[@inline] uint64_as_zigzag d = `unsigned (zigzag d) let[@inline] uint32_as_bits32 d = `unsigned (bits32 d) let[@inline] uint64_as_bits64 d = `unsigned (bits64 d) let[@inline] bool d = bool_of_int64 "" ((varint [@inlined]) d) let[@inline] float_as_bits32 d = Int32.float_of_bits (bits32 d) let[@inline] float_as_bits64 d = Int64.float_of_bits (bits64 d) let[@inline] int_as_bits32 d = int_of_int32 "" (bits32 d) let[@inline] int_as_bits64 d = int_of_int64 "" (bits64 d) let string d = (* strings are always shorter than range of int *) let len = int_as_varint d in if d.offset + len > d.limit then raise (Failure Incomplete); let str = Bytes.sub_string d.source d.offset len in d.offset <- d.offset + len; str let wrapper_double_value d = let d = nested d in match key d with | Some (1, Bits64) -> Some (float_as_bits64 d) | _ -> None let wrapper_float_value d = let d = nested d in match key d with | Some (1, Bits32) -> Some (float_as_bits32 d) | _ -> None let wrapper_int64_value d = let d = nested d in match key d with | Some (1, Varint) -> Some (int64_as_varint d) | _ -> None let wrapper_int32_value d = let d = nested d in match key d with | Some (1, Varint) -> Some (int32_as_varint d) | _ -> None let wrapper_bool_value d = let d = nested d in match key d with | Some (1, Varint) -> Some (bool d) | _ -> None let wrapper_string_value d = let d = nested d in match key d with | Some (1, Bytes) -> Some (string d) | _ -> None let wrapper_bytes_value d = let d = nested d in match key d with | Some (1, Bytes) -> Some (bytes d) | _ -> None end module Encoder = struct type error = Overflow of string let error_to_string e = match e with | Overflow fld -> Printf.sprintf "Overflow(%S)" fld exception Failure of error let () = Printexc.register_printer (fun exn -> match exn with | Failure e -> Some (Printf.sprintf "Protobuf.Encoder.Failure(%s)" (error_to_string e)) | _ -> None) type t = { mutable b: bytes; (** Slice of bytes (already written: [start…]) *) mutable start: int; (** Start of the slice in which data have been written *) initial: bytes; (** Initial buffer, for {!reset} *) } let create ?(size = 16) () = let len = max size 16 in let b = Bytes.create len in { b; start = len; initial = b } let[@inline] cap self = Bytes.length self.b let[@inline] clear self = self.start <- cap self let reset self = self.b <- self.initial; self.start <- cap self let[@inline] to_string self = Bytes.sub_string self.b self.start (cap self - self.start) let[@inline] to_bytes self = Bytes.sub self.b self.start (cap self - self.start) let[@inline] write_chunks w self : unit = w self.b self.start (cap self - self.start) let next_cap_ self = min Sys.max_string_length (let n = cap self in n + (n lsr 1)) let[@inline never] grow_to_ self newcap = if newcap = cap self then raise (Failure (Overflow "encoder size reached its max")); let b' = Bytes.create newcap in let len = cap self - self.start in Bytes.blit self.b self.start b' (newcap - len) len; self.start <- newcap - len; self.b <- b' (** Grow to next size *) let[@inline never] grow_ self = grow_to_ self (next_cap_ self) (** Grow to get [n] free bytes *) let[@inline never] grow_reserve_n (self : t) n : unit = let newcap = max (cap self + n) (next_cap_ self) in grow_to_ self newcap; assert (self.start >= n) let[@inline] add_char self c = if self.start = 0 then grow_ self; self.start <- self.start - 1; Bytes.unsafe_set self.b self.start c (** Reserve [n] bytes, return the start offset of the newly allocated slice *) let[@inline] reserve_n (self : t) (n : int) : int = if self.start < n then grow_reserve_n self n; self.start <- self.start - n; self.start let add_bytes self b = let n = Bytes.length b in let start = reserve_n self n in Bytes.blit b 0 self.b start n external varint_size : (int64[@unboxed]) -> int = "caml_pbrt_varint_size_byte" "caml_pbrt_varint_size" [@@noalloc] (** Compute how many bytes this int would occupy as varint *) external varint_slice : bytes -> (int[@untagged]) -> (int64[@unboxed]) -> unit = "caml_pbrt_varint_byte" "caml_pbrt_varint" [@@noalloc] (** Write this int as varint into the given slice *) let[@inline] varint64 (i : int64) e = let n_bytes = varint_size i in let start = reserve_n e n_bytes in varint_slice e.b start i let int_as_varint i e = let i = Int64.of_int i in let n_bytes = varint_size i in let start = reserve_n e n_bytes in varint_slice e.b start i let zigzag i e = let i = Int64.of_int i in let i = Int64.(logxor (shift_left i 1) (shift_right i 63)) in let n_bytes = varint_size i in let start = reserve_n e n_bytes in varint_slice e.b start i let[@inline] zigzag64 i e = (varint64 [@inlined]) Int64.(logxor (shift_left i 1) (shift_right i 63)) e let[@inline] bits32 i e = let start = reserve_n e 4 in Bytes.set_int32_le e.b start i let[@inline] bits64 i e = let start = reserve_n e 8 in Bytes.set_int64_le e.b start i let bytes b e = add_bytes e b; int_as_varint (Bytes.length b) e let[@inline] nested f x e = (* compute length because it's not affected by a resize during the call to [f] *) let old_len = cap e - e.start in f x e; let new_len = cap e - e.start in let size = new_len - old_len in int_as_varint size e let[@inline] key k pk e = let pk' = match pk with | Varint -> 0 | Bits64 -> 1 | Bytes -> 2 | Bits32 -> 5 in int_as_varint (pk' lor (k lsl 3)) e let map_entry ~encode_key ~encode_value kv t = nested (fun kv t -> let (key_value, key_pk), (value_value, value_pk) = kv in encode_value value_value t; key 2 value_pk t; encode_key key_value t; key 1 key_pk t) kv t let empty_nested e = add_char e (Char.unsafe_chr 0) let int_as_zigzag = zigzag let int32_as_varint i e = (varint64 [@inlined]) (Int64.of_int32 i) e let int32_as_zigzag i e = (zigzag64 [@inlined]) (Int64.of_int32 i) e let int64_as_varint = varint64 let int64_as_zigzag = zigzag64 let int32_as_bits32 = bits32 let int64_as_bits64 = bits64 let uint32_as_varint = function | `unsigned d -> int32_as_varint d let uint32_as_zigzag = function | `unsigned d -> int32_as_zigzag d let uint64_as_varint = function | `unsigned d -> varint64 d let uint64_as_zigzag = function | `unsigned d -> zigzag64 d let uint32_as_bits32 = function | `unsigned x -> bits32 x let uint64_as_bits64 = function | `unsigned x -> bits64 x let[@inline] bool b e = add_char e (Char.unsafe_chr (if b then 1 else 0)) let[@inline] float_as_bits32 f e = bits32 (Int32.bits_of_float f) e let[@inline] float_as_bits64 f e = bits64 (Int64.bits_of_float f) e let[@inline] int_as_bits32 i e = bits32 (Int32.of_int i) e let[@inline] int_as_bits64 i e = bits64 (Int64.of_int i) e let[@inline] string s e = (* safe: we're not going to modify the bytes, and [s] will not change. *) bytes (Bytes.unsafe_of_string s) e let wrapper_double_value v e = nested (fun v e -> (match v with | None -> () | Some f -> float_as_bits64 f e); key 1 Bits64 e) v e let wrapper_float_value v e = nested (fun v e -> (match v with | None -> () | Some f -> float_as_bits32 f e); key 1 Bits32 e) v e let wrapper_int64_value v e = nested (fun v e -> (match v with | None -> () | Some i -> int64_as_varint i e); key 1 Varint e) v e let wrapper_int32_value v e = nested (fun v e -> (match v with | None -> () | Some i -> int32_as_varint i e); key 1 Varint e) v e let wrapper_bool_value v e = nested (fun v e -> (match v with | None -> () | Some b -> bool b e); key 1 Varint e) v e let wrapper_string_value v e = nested (fun v e -> (match v with | None -> () | Some s -> string s e); key 1 Bytes e) v e let wrapper_bytes_value v e = nested (fun v e -> (match v with | None -> () | Some b -> bytes b e); key 1 Bytes e) v e end module List_util = struct let rev_iter_with f l st = let rec iter_ f l st = match l with | [] -> () | x :: tl -> f x st; iter_ f tl st in let rec direct i f l st = match l with | [] -> () | [ x ] -> f x st | [ x; y ] -> f y st; f x st | _ when i = 0 -> iter_ f (List.rev l) st | x :: y :: tl -> direct (i - 1) f tl st; f y st; f x st in match l with | [] -> () | [ x ] -> f x st | [ x; y ] -> f y st; f x st | x :: y :: tl -> direct 200 f tl st; f y st; f x st end module Repeated_field = struct type 'a t = { mutable s: int; (* total size (allocated) of the partial array [a] *) mutable i: int; (* current number of inserted element in [a] *) mutable a: 'a array; (* partial array *) mutable l: 'a array list; (* previously filled array [List.hd l] is the last filled array *) } (** [t] is a container optimized for fast repeated inserts. It is made of a list of growing size array [l] as well as a current array [a] in which inserts are performed until [a] is full and appended to [l]. The main growing logic is implemented in the [add] functions. *) let make v = { s = 16; i = 0; a = Array.make 16 v; l = [] } let of_array_no_copy a = { (* We intentionally don't put [a] argument in [l] directly since it would require the allocation of a new array and an initial value. Since [Array.length a] could be [0] we would not be able to get such a value from the [a] argument. Hence the transfer of [a] to [l] will be done in the subsequent [add v t] call in which [v] argument is used to initialize the new array. *) s = Array.length a; i = Array.length a; a; l = []; } let add v ({ s; i; a; l } as tmp) = match i with | i when i = s -> (* [1.3] is an emperical growth factor found to be a good balance for allocation of a new array. *) tmp.s <- int_of_float (float_of_int s *. 1.3); tmp.i <- 1; tmp.l <- a :: l; tmp.a <- Array.make tmp.s v | i -> Array.unsafe_set a i v; tmp.i <- i + 1 let to_array { s; i; a; l } = let l = match i with | 0 -> l | i when i = s -> a :: l | i -> Array.sub a 0 i :: l in Array.concat (List.rev l) let iter f { i; a; l; _ } = List_util.rev_iter_with (fun a f -> let len = Array.length a - 1 in for j = 0 to len do f (Array.unsafe_get a j) done) l f; let len = i - 1 in for j = 0 to len do f (Array.unsafe_get a j) done let rec list_iter_with_ f l st = match l with | [] -> () | x :: tl -> f x st; list_iter_with_ f tl st let rev_iter_with f (self : _ t) st = let len = self.i - 1 in for j = len downto 0 do f (Array.unsafe_get self.a j) st done; list_iter_with_ (fun a st -> let len = Array.length a - 1 in for j = len downto 0 do f (Array.unsafe_get a j) st done) self.l st let iteri f { i; a; l; _ } = let counter = ref 0 in List_util.rev_iter_with (fun a f -> let len = Array.length a - 1 in for j = 0 to len do f !counter (Array.unsafe_get a j); incr counter done) l f; let len = i - 1 in for j = 0 to len do f !counter (Array.unsafe_get a j); incr counter done let fold_left f e0 t = let acc = ref e0 in iter (fun e -> acc := f !acc e) t; !acc let length { s = _; i; a = _; l } : int = let len = List.fold_left (fun len a -> len + Array.length a) 0 l in len + i let map_to_array f t = let len = length t in let dest = Array.make len (f @@ Array.unsafe_get t.a 0) in let index = ref 0 in iter (fun e -> Array.unsafe_set dest !index (f e); incr index) t; dest let map_to_list f { s = _; i; a; l } = let rec a_to_list a i res = if i < 0 then res else a_to_list a (i - 1) (f (Array.unsafe_get a i) :: res) in (* start with last (partial) array and its last index *) let res = a_to_list a (i - 1) [] in (* go over the filled array *) List.fold_left (fun acc a -> a_to_list a (Array.length a - 1) acc) res l external identity : 'a -> 'a = "%identity" let to_list t = map_to_list identity t end module Pp = struct module F = Format type formatter = F.formatter let pp_unit fmt () = F.pp_print_string fmt "()" let pp_int = F.pp_print_int let pp_float = F.pp_print_float let pp_bool = F.pp_print_bool let pp_int32 fmt i = F.pp_print_string fmt (Int32.to_string i) let pp_unsigned_of_int32 fmt = function | `unsigned i -> F.fprintf fmt "%lu" i let pp_int64 fmt i = F.pp_print_string fmt (Int64.to_string i) let pp_unsigned_of_int64 fmt = function | `unsigned i -> F.fprintf fmt "%Lu" i let pp_string fmt s = F.fprintf fmt "\"%a\"" F.pp_print_string s let pp_bytes fmt b = F.fprintf fmt "<bytes len=%d>" (Bytes.length b) let pp_option pp_f fmt = function | None -> F.fprintf fmt "@[None@]" | Some x -> F.fprintf fmt "@[<hv2>Some(@,%a)@]" pp_f x let pp_wrapper_float fmt v = pp_option pp_float fmt v let pp_wrapper_bool fmt v = pp_option pp_bool fmt v let pp_wrapper_int32 fmt v = pp_option pp_int32 fmt v let pp_wrapper_int64 fmt v = pp_option pp_int64 fmt v let pp_wrapper_string fmt v = pp_option pp_string fmt v let pp_wrapper_bytes fmt v = pp_option pp_bytes fmt v let pp_list pp_element fmt l = let rec pp_i fmt = function | [ h ] -> Format.fprintf fmt "%a" pp_element h | h :: t -> Format.fprintf fmt "%a;@,%a" pp_element h pp_i t | [] -> () in F.fprintf fmt "[@[<hv>%a@,@]]" pp_i l let pp_associative_list pp_key pp_value fmt l = let pp_element fmt (k, v) = F.fprintf fmt "(@[%a,@ %a@])" pp_key k pp_value v in pp_list pp_element fmt l let pp_hastable pp_key pp_value fmt h = let l = Hashtbl.fold (fun a b l -> (a, b) :: l) h [] in pp_associative_list pp_key pp_value fmt l let pp_record_field ?(first = false) field_name pp_val fmt val_ = if not first then F.fprintf fmt "@ "; F.fprintf fmt "@[<hv2>%s =@ %a;@]" field_name pp_val val_ let pp_brk pp_record (fmt : F.formatter) r : unit = F.fprintf fmt "@[<hv2>{ %a@;<1 -2>@]}" pp_record r end