@BEGIN_BEFORE_4_02_0@
include Stdcompat__string

let empty = ""

let of_string = copy

let to_string = copy

let sub_string = sub

let extend s left right =
  let len = left + length s + right in
  let result = create len in
  let trim_left = max (- left) 0 in
  unsafe_blit s trim_left result (max left 0)
    (length s - trim_left - max (- right) 0);
  result

let blit_string = blit

let cat = ( ^ )

let unsafe_of_string s = s

let unsafe_to_string s = s
@END_BEFORE_4_02_0@
@BEGIN_FROM_4_02_0@
include Bytes

@BEGIN_BEFORE_4_05_0@
let index_opt s c =
  Stdcompat__tools.option_find (index s) c

let rindex_opt s c =
  Stdcompat__tools.option_find (rindex s) c

let index_from_opt s i c =
  Stdcompat__tools.option_find (index_from s i) c

let rindex_from_opt s i c =
  Stdcompat__tools.option_find (rindex_from s i) c
@END_BEFORE_4_05_0@
@END_FROM_4_02_0@

@BEGIN_BEFORE_4_03_0@
let uppercase_ascii = uppercase

let lowercase_ascii = lowercase

let capitalize_ascii = capitalize

let uncapitalize_ascii = uncapitalize

let equal : t -> t -> bool = ( = )
@END_BEFORE_4_03_0@

@BEGIN_BEFORE_4_07_0@
let of_seq g =
  Stdcompat__buffer.to_bytes (Stdcompat__buffer.of_seq g)

let to_seq s = Stdcompat__tools.vec_to_seq length unsafe_get s

let to_seqi s = Stdcompat__tools.vec_to_seqi length unsafe_get s
@END_BEFORE_4_07_0@

@BEGIN_BEFORE_4_08_0@
let pad_sign i w =
  let pad_width = Stdcompat__sys.int_size - w in
  (i lsl pad_width) asr pad_width

let index_out_of_bounds () =
  invalid_arg "index out of bounds"

let unsafe_get_uint8 b i =
  int_of_char (get b i)

let get_uint8 b i =
  if i < 0 || i >= length b then
    index_out_of_bounds ();
  unsafe_get_uint8 b i

let get_int8 b i =
  pad_sign (get_uint8 b i) 8

let get_uint16_le b i =
  if i < 0 || succ i >= length b then
    index_out_of_bounds ();
  let l = unsafe_get_uint8 b i in
  let u = unsafe_get_uint8 b (succ i) in
  l lor u lsl 8

let get_uint16_be b i =
  if i < 0 || succ i >= length b then
    index_out_of_bounds ();
  let u = unsafe_get_uint8 b i in
  let l = unsafe_get_uint8 b (succ i) in
  l lor u lsl 8

let get_uint16_ne b i =
  if Stdcompat__sys.big_endian then get_uint16_be b i
  else get_uint16_le b i

let get_int16_le b i =
  pad_sign (get_uint16_le b i) 16

let get_int16_be b i =
  pad_sign (get_uint16_be b i) 16

let get_int16_ne b i =
  pad_sign (get_uint16_ne b i) 16

let get_int32_le b i =
  if i < 0 || i + 3 >= length b then
    index_out_of_bounds ();
  let i0 = unsafe_get_uint8 b i in
  let i1 = unsafe_get_uint8 b (i + 1) in
  let i2 = unsafe_get_uint8 b (i + 2) in
  let i3 = unsafe_get_uint8 b (i + 3) in
  Int32.logor (Int32.of_int i0)
    (Int32.logor (Int32.shift_left (Int32.of_int i1) 8)
      (Int32.logor (Int32.shift_left (Int32.of_int i2) 16)
        (Int32.shift_left (Int32.of_int i3) 24)))

let get_int32_be b i =
  if i < 0 || i + 3 >= length b then
    index_out_of_bounds ();
  let i3 = unsafe_get_uint8 b i in
  let i2 = unsafe_get_uint8 b (i + 1) in
  let i1 = unsafe_get_uint8 b (i + 2) in
  let i0 = unsafe_get_uint8 b (i + 3) in
  Int32.logor (Int32.of_int i0)
    (Int32.logor (Int32.shift_left (Int32.of_int i1) 8)
      (Int32.logor (Int32.shift_left (Int32.of_int i2) 16)
        (Int32.shift_left (Int32.of_int i3) 24)))

let get_int32_ne b i =
  if Stdcompat__sys.big_endian then get_int32_be b i
  else get_int32_le b i

let get_int64_le b i =
  if i < 0 || i + 7 >= length b then
    index_out_of_bounds ();
  let i0 = unsafe_get_uint8 b i in
  let i1 = unsafe_get_uint8 b (i + 1) in
  let i2 = unsafe_get_uint8 b (i + 2) in
  let i3 = unsafe_get_uint8 b (i + 3) in
  let i4 = unsafe_get_uint8 b (i + 4) in
  let i5 = unsafe_get_uint8 b (i + 5) in
  let i6 = unsafe_get_uint8 b (i + 6) in
  let i7 = unsafe_get_uint8 b (i + 7) in
  Int64.logor (Int64.of_int i0)
    (Int64.logor (Int64.shift_left (Int64.of_int i1) 8)
      (Int64.logor (Int64.shift_left (Int64.of_int i2) 16)
        (Int64.logor (Int64.shift_left (Int64.of_int i3) 24)
          (Int64.logor (Int64.shift_left (Int64.of_int i4) 32)
            (Int64.logor (Int64.shift_left (Int64.of_int i5) 40)
              (Int64.logor (Int64.shift_left (Int64.of_int i6) 48)
                (Int64.shift_left (Int64.of_int i7) 56)))))))

let get_int64_be b i =
  if i < 0 || i + 7 >= length b then
    index_out_of_bounds ();
  let i7 = unsafe_get_uint8 b i in
  let i6 = unsafe_get_uint8 b (i + 1) in
  let i5 = unsafe_get_uint8 b (i + 2) in
  let i4 = unsafe_get_uint8 b (i + 3) in
  let i3 = unsafe_get_uint8 b (i + 4) in
  let i2 = unsafe_get_uint8 b (i + 5) in
  let i1 = unsafe_get_uint8 b (i + 6) in
  let i0 = unsafe_get_uint8 b (i + 7) in
  Int64.logor (Int64.of_int i0)
    (Int64.logor (Int64.shift_left (Int64.of_int i1) 8)
      (Int64.logor (Int64.shift_left (Int64.of_int i2) 16)
        (Int64.logor (Int64.shift_left (Int64.of_int i3) 24)
          (Int64.logor (Int64.shift_left (Int64.of_int i4) 32)
            (Int64.logor (Int64.shift_left (Int64.of_int i5) 40)
              (Int64.logor (Int64.shift_left (Int64.of_int i6) 48)
                (Int64.shift_left (Int64.of_int i7) 56)))))))

let get_int64_ne b i =
  if Stdcompat__sys.big_endian then get_int64_be b i
  else get_int64_le b i

let unsafe_set_uint8 b i v =
  unsafe_set b i (char_of_int (v land 0xFF))

let set_uint8 b i v =
  if i < 0 || i >= length b then
    index_out_of_bounds ();
  unsafe_set_uint8 b i v

let set_int8 = set_uint8

let set_uint16_le b i v =
  if i < 0 || succ i >= length b then
    index_out_of_bounds ();
  unsafe_set_uint8 b i v;
  unsafe_set_uint8 b (succ i) (v lsr 8)

let set_uint16_be b i v =
  if i < 0 || succ i >= length b then
    index_out_of_bounds ();
  unsafe_set_uint8 b i (v lsr 8);
  unsafe_set_uint8 b (succ i) v

let set_uint16_ne b i v =
  if Stdcompat__sys.big_endian then set_uint16_be b i v
  else set_uint16_le b i v

let set_int16_le = set_uint16_le

let set_int16_be = set_uint16_be

let set_int16_ne = set_uint16_ne

let set_int32_le b i v =
  if i < 0 || i + 3 >= length b then
    index_out_of_bounds ();
  unsafe_set_uint8 b i (Int32.to_int v);
  unsafe_set_uint8 b (i + 1) (Int32.to_int (Int32.shift_right v 8));
  unsafe_set_uint8 b (i + 2) (Int32.to_int (Int32.shift_right v 16));
  unsafe_set_uint8 b (i + 3) (Int32.to_int (Int32.shift_right v 24))

let set_int32_be b i v =
  if i < 0 || i + 3 >= length b then
    index_out_of_bounds ();
  unsafe_set_uint8 b i (Int32.to_int (Int32.shift_right v 24));
  unsafe_set_uint8 b (i + 1) (Int32.to_int (Int32.shift_right v 16));
  unsafe_set_uint8 b (i + 2) (Int32.to_int (Int32.shift_right v 8));
  unsafe_set_uint8 b (i + 3) (Int32.to_int v)

let set_int32_ne b i v =
  if Stdcompat__sys.big_endian then set_int32_be b i v
  else set_int32_le b i v

let set_int64_le b i v =
  if i < 0 || i + 7 >= length b then
    index_out_of_bounds ();
  unsafe_set_uint8 b i (Int64.to_int v);
  unsafe_set_uint8 b (i + 1) (Int64.to_int (Int64.shift_right v 8));
  unsafe_set_uint8 b (i + 2) (Int64.to_int (Int64.shift_right v 16));
  unsafe_set_uint8 b (i + 3) (Int64.to_int (Int64.shift_right v 24));
  unsafe_set_uint8 b (i + 4) (Int64.to_int (Int64.shift_right v 32));
  unsafe_set_uint8 b (i + 5) (Int64.to_int (Int64.shift_right v 40));
  unsafe_set_uint8 b (i + 6) (Int64.to_int (Int64.shift_right v 48));
  unsafe_set_uint8 b (i + 7) (Int64.to_int (Int64.shift_right v 56))

let set_int64_be b i v =
  if i < 0 || i + 7 >= length b then
    index_out_of_bounds ();
  unsafe_set_uint8 b i (Int64.to_int (Int64.shift_right v 56));
  unsafe_set_uint8 b (i + 1) (Int64.to_int (Int64.shift_right v 48));
  unsafe_set_uint8 b (i + 2) (Int64.to_int (Int64.shift_right v 40));
  unsafe_set_uint8 b (i + 3) (Int64.to_int (Int64.shift_right v 32));
  unsafe_set_uint8 b (i + 4) (Int64.to_int (Int64.shift_right v 24));
  unsafe_set_uint8 b (i + 5) (Int64.to_int (Int64.shift_right v 16));
  unsafe_set_uint8 b (i + 6) (Int64.to_int (Int64.shift_right v 8));
  unsafe_set_uint8 b (i + 7) (Int64.to_int v)

let set_int64_ne b i v =
  if Stdcompat__sys.big_endian then set_int64_be b i v
  else set_int64_le b i v
@END_BEFORE_4_08_0@

@BEGIN_FROM_4_03_0@
external unsafe_blit_string :
  string -> int -> bytes -> int -> int -> unit = "caml_blit_string"[@@noalloc]
@END_FROM_4_03_0@
@BEGIN_BEFORE_4_03_0@
@BEGIN_FROM_3_08_0@
external unsafe_blit_string :
  string -> int -> Stdcompat__init.bytes -> int -> int -> unit =
    "caml_blit_string" "noalloc"
@END_FROM_3_08_0@
@BEGIN_BEFORE_3_08_0@
external unsafe_blit_string :
  string -> int -> Stdcompat__init.bytes -> int -> int -> unit =
    "blit_string" "noalloc"
@END_BEFORE_3_08_0@
@END_BEFORE_4_03_0@