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(** Vint: variable-length representation of integers *)

(**
   This module currently provides only conversions between vint and the
   OCaml int type. Here are the current limits of OCaml ints on
   32-bit and 64-bit systems:
{v
   word length (bits)                 32          64

   int length (bits)                  31          63

   min_int (lowest signed int)        0x40000000  0x4000000000000000
                                      -1073741824 -4611686018427387904

   max_int (greatest signed int)      0x3fffffff  0x3fffffffffffffff
                                      1073741823  4611686018427387903

   lowest unsigned int                0x0         0x0
                                      0           0

   greatest unsigned int              0x7fffffff  0x7fffffffffffffff
                                      2147483647  9223372036854775807

   maximum vint length (data bits)    31          63
   maximum vint length (total bytes)  5           9
v}
*)

type uint = int
  (** Unsigned int.
      Note that ints (signed) and uints use the same representation
      for integers within \[0, [max_int]\].
  *)

val uvint_of_uint : ?buf:Bi_outbuf.t -> uint -> string
  (** Convert an unsigned int to a vint.
      @param buf existing output buffer that could be reused by this function
      instead of creating a new one. *)

val svint_of_int : ?buf:Bi_outbuf.t -> int -> string
  (** Convert a signed int to a vint.
      @param buf existing output buffer that could be reused by this function
      instead of creating a new one. *)

val uint_of_uvint : string -> uint
  (** Interpret a vint as an unsigned int.
      @raise Bi_util.Error if the input string is not a single valid uvint
      that is representable using the uint type. *)

val int_of_svint : string -> int
  (** Interpret a vint as a signed int.
      @raise Bi_util.Error if the input string is not a single valid svint
      that is representable using the int type. *)

val write_uvint : Bi_outbuf.t -> uint -> unit
  (** Write an unsigned int to a buffer. *)

val write_svint : Bi_outbuf.t -> int -> unit
  (** Write a signed int to a buffer. *)

val read_uvint : Bi_inbuf.t -> uint
  (** Read an unsigned int from a buffer.
      @raise Bi_util.Error if there is no data to read from or if the
      uvint is not representable using the uint type. *)

val read_svint : Bi_inbuf.t -> int
  (** Read a signed int from a buffer.
      @raise Bi_util.Error if there is no data to read from or if the
      svint is not representable using the int type. *)