Module Core_kernel.Bigstring

String type based on Bigarray, for use in I/O and C-bindings.

Types and exceptions

type t = (Core_kernel__.Import.char, Stdlib.Bigarray.int8_unsigned_elt, Stdlib.Bigarray.c_layout) Stdlib.Bigarray.Array1.t

Type of bigstrings

val compare : t -> t -> Core_kernel__.Import.int
val sexp_of_t : t -> Ppx_sexp_conv_lib.Sexp.t
type t_frozen = t

Type of bigstrings which support hashing. Note that mutation invalidates previous hashes.

val compare_t_frozen : t_frozen -> t_frozen -> Core_kernel__.Import.int
val hash_fold_t_frozen : Base.Hash.state -> t_frozen -> Base.Hash.state
val hash_t_frozen : t_frozen -> Base.Hash.hash_value
val sexp_of_t_frozen : t_frozen -> Ppx_sexp_conv_lib.Sexp.t
include module type of Base_bigstring with type Base_bigstring.t := t and type Base_bigstring.t_frozen := t_frozen

Types and exceptions

type t = (Base.char, Stdlib.Bigarray.int8_unsigned_elt, Stdlib.Bigarray.c_layout) Stdlib.Bigarray.Array1.t

Type of bigstrings

val compare : t -> t -> Base.int
include Ppx_sexp_conv_lib.Sexpable.S with type t := t
type t
val t_of_sexp : Sexplib0.Sexp.t -> t
val sexp_of_t : t -> Sexplib0.Sexp.t
type t_frozen = t

Type of bigstrings which support hashing. Note that mutation invalidates previous hashes.

val compare_t_frozen : t_frozen -> t_frozen -> Base.int
val hash_fold_t_frozen : Base.Hash.state -> t_frozen -> Base.Hash.state
val hash_t_frozen : t_frozen -> Base.Hash.hash_value
val sexp_of_t_frozen : t_frozen -> Ppx_sexp_conv_lib.Sexp.t
val t_frozen_of_sexp : Ppx_sexp_conv_lib.Sexp.t -> t_frozen
include Base.Equal.S with type t := t
type t
val equal : t Base.Equal.equal

Creation and string conversion

val create : ?⁠max_mem_waiting_gc_in_bytes:Base.int -> Base.int -> t

create length

parameter max_mem_waiting_gc

default = 256 M in OCaml <= 3.12, 1 G otherwise. As the total allocation of calls to create approach max_mem_waiting_gc_in_bytes, the pressure in the garbage collector to be more agressive will increase.

returns

a new bigstring having length. Content is undefined.

val init : Base.int -> f:(Base.int -> Base.char) -> t

init n ~f creates a bigstring t of length n, with t.{i} = f i.

val of_string : ?⁠pos:Base.int -> ?⁠len:Base.int -> Base.string -> t

of_string ?pos ?len str

returns

a new bigstring that is equivalent to the substring of length len in str starting at position pos.

parameter pos

default = 0

parameter len

default = String.length str - pos

val of_bytes : ?⁠pos:Base.int -> ?⁠len:Base.int -> Base.bytes -> t

of_bytes ?pos ?len str

returns

a new bigstring that is equivalent to the subbytes of length len in str starting at position pos.

parameter pos

default = 0

parameter len

default = Bytes.length str - pos

val to_string : ?⁠pos:Base.int -> ?⁠len:Base.int -> t -> Base.string

to_string ?pos ?len bstr

returns

a new string that is equivalent to the substring of length len in bstr starting at position pos.

parameter pos

default = 0

parameter len

default = length bstr - pos

raises Invalid_argument

if the string would exceed runtime limits.

val to_bytes : ?⁠pos:Base.int -> ?⁠len:Base.int -> t -> Base.bytes

to_bytes ?pos ?len bstr

returns

a new byte sequence that is equivalent to the substring of length len in bstr starting at position pos.

parameter pos

default = 0

parameter len

default = length bstr - pos

raises Invalid_argument

if the bytes would exceed runtime limits.

val concat : ?⁠sep:t -> t Base.list -> t

concat ?sep list returns the concatenation of list with sep in between each.

Checking

val check_args : loc:Base.string -> pos:Base.int -> len:Base.int -> t -> Base.unit

check_args ~loc ~pos ~len bstr checks the position and length arguments pos and len for bigstrings bstr.

raises

Invalid_argument if these arguments are illegal for the given bigstring using loc to indicate the calling context.

val get_opt_len : t -> pos:Base.int -> Base.int Base.option -> Base.int

get_opt_len bstr ~pos opt_len

returns

the length of a subbigstring in bstr starting at position pos and given optional length opt_len. This function does not check the validity of its arguments. Use check_args for that purpose.

Accessors

val length : t -> Base.int

length bstr

returns

the length of bigstring bstr.

val get : t -> Base.int -> Base.char

get t pos returns the character at pos

val set : t -> Base.int -> Base.char -> Base.unit

set t pos sets the character at pos

val is_mmapped : t -> Base.bool

is_mmapped bstr

returns

whether the bigstring bstr is memory-mapped.

Blitting

include Base.Blit.S with type t := t
type t
val blit : (t, t) Base__.Blit_intf.blit
val blito : (t, t) Base__.Blit_intf.blito
val unsafe_blit : (t, t) Base__.Blit_intf.blit
val sub : (t, t) Base__.Blit_intf.sub
val subo : (t, t) Base__.Blit_intf.subo
val copy : t -> t
module To_string = Base_bigstring.To_string
module From_string = Base_bigstring.From_string
module To_bytes = Base_bigstring.To_bytes
module From_bytes = Base_bigstring.From_bytes
val memset : t -> pos:Base.int -> len:Base.int -> Base.char -> Base.unit

memset t ~pos ~len c fills t with c within the range [pos, pos + len).

val memcmp : t -> pos1:Base.int -> t -> pos2:Base.int -> len:Base.int -> Base.int

memcmp t1 ~pos1 t2 ~pos2 ~len is like compare t1 t2 except performs the comparison on the subregions of t1 and t2 defined by pos1, pos2, and len.

val find : ?⁠pos:Base.int -> ?⁠len:Base.int -> Base.char -> t -> Base.int Base.option

find ?pos ?len char t returns Some i for the smallest i >= pos such that t.{i} = char, or None if there is no such i.

parameter pos

default = 0

parameter len

default = length bstr - pos

val unsafe_find : t -> Base.char -> pos:Base.int -> len:Base.int -> Base.int

Same as find, but does no bounds checking, and returns a negative value instead of None if char is not found.

Accessors for parsing binary values, analogous to Binary_packing

These are in Bigstring rather than a separate module because:

1. Existing Binary_packing requires copies and does not work with bigstrings. 2. The accessors rely on the implementation of bigstring, and hence should change should the implementation of bigstring move away from Bigarray. 3. Bigstring already has some external C functions, so it didn't require many changes to the jbuild ^_^.

In a departure from Binary_packing, the naming conventions are chosen to be close to C99 stdint types, as it's a more standard description and it is somewhat useful in making compact macros for the implementations. The accessor names contain endian-ness to allow for branch-free implementations

<accessor> ::= <unsafe><operation><type><endian> <unsafe> ::= unsafe_ | '' <operation> ::= get_ | set_ <type> ::= int8 | uint8 | int16 | uint16 | int32 | uint32 | int64 | uint64 <endian> ::= _le | _be | ''

The unsafe_ prefix indicates that these functions do no bounds checking and silently truncate out-of-range numeric arguments.

val get_int8 : t -> pos:Base.int -> Base.int
val set_int8_exn : t -> pos:Base.int -> Base.int -> Base.unit
val get_uint8 : t -> pos:Base.int -> Base.int
val set_uint8_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_int8 : t -> pos:Base.int -> Base.int
val unsafe_set_int8 : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_uint8 : t -> pos:Base.int -> Base.int
val unsafe_set_uint8 : t -> pos:Base.int -> Base.int -> Base.unit

16-bit methods

val get_int16_le : t -> pos:Base.int -> Base.int
val get_int16_be : t -> pos:Base.int -> Base.int
val set_int16_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_int16_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_int16_le : t -> pos:Base.int -> Base.int
val unsafe_get_int16_be : t -> pos:Base.int -> Base.int
val unsafe_set_int16_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_int16_be : t -> pos:Base.int -> Base.int -> Base.unit
val get_uint16_le : t -> pos:Base.int -> Base.int
val get_uint16_be : t -> pos:Base.int -> Base.int
val set_uint16_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_uint16_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_uint16_le : t -> pos:Base.int -> Base.int
val unsafe_get_uint16_be : t -> pos:Base.int -> Base.int
val unsafe_set_uint16_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_uint16_be : t -> pos:Base.int -> Base.int -> Base.unit

32-bit methods

val get_int32_le : t -> pos:Base.int -> Base.int
val get_int32_be : t -> pos:Base.int -> Base.int
val set_int32_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_int32_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_int32_le : t -> pos:Base.int -> Base.int
val unsafe_get_int32_be : t -> pos:Base.int -> Base.int
val unsafe_set_int32_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_int32_be : t -> pos:Base.int -> Base.int -> Base.unit
val get_uint32_le : t -> pos:Base.int -> Base.int
val get_uint32_be : t -> pos:Base.int -> Base.int
val set_uint32_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_uint32_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_uint32_le : t -> pos:Base.int -> Base.int
val unsafe_get_uint32_be : t -> pos:Base.int -> Base.int
val unsafe_set_uint32_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_uint32_be : t -> pos:Base.int -> Base.int -> Base.unit

64-bit signed values

val get_int64_le_exn : t -> pos:Base.int -> Base.int
val get_int64_be_exn : t -> pos:Base.int -> Base.int
val get_int64_le_trunc : t -> pos:Base.int -> Base.int
val get_int64_be_trunc : t -> pos:Base.int -> Base.int
val set_int64_le : t -> pos:Base.int -> Base.int -> Base.unit
val set_int64_be : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_int64_le_exn : t -> pos:Base.int -> Base.int
val unsafe_get_int64_be_exn : t -> pos:Base.int -> Base.int
val unsafe_get_int64_le_trunc : t -> pos:Base.int -> Base.int
val unsafe_get_int64_be_trunc : t -> pos:Base.int -> Base.int
val unsafe_set_int64_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_int64_be : t -> pos:Base.int -> Base.int -> Base.unit

64-bit unsigned values

val get_uint64_be_exn : t -> pos:Base.int -> Base.int
val get_uint64_le_exn : t -> pos:Base.int -> Base.int
val set_uint64_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_uint64_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_uint64_be_exn : t -> pos:Base.int -> Base.int
val unsafe_get_uint64_le_exn : t -> pos:Base.int -> Base.int
val unsafe_set_uint64_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_uint64_be : t -> pos:Base.int -> Base.int -> Base.unit

32-bit methods with full precision

val get_int32_t_le : t -> pos:Base.int -> Base.Int32.t
val get_int32_t_be : t -> pos:Base.int -> Base.Int32.t
val set_int32_t_le : t -> pos:Base.int -> Base.Int32.t -> Base.unit
val set_int32_t_be : t -> pos:Base.int -> Base.Int32.t -> Base.unit
val unsafe_get_int32_t_le : t -> pos:Base.int -> Base.Int32.t
val unsafe_get_int32_t_be : t -> pos:Base.int -> Base.Int32.t
val unsafe_set_int32_t_le : t -> pos:Base.int -> Base.Int32.t -> Base.unit
val unsafe_set_int32_t_be : t -> pos:Base.int -> Base.Int32.t -> Base.unit

64-bit methods with full precision

val get_int64_t_le : t -> pos:Base.int -> Base.Int64.t
val get_int64_t_be : t -> pos:Base.int -> Base.Int64.t
val set_int64_t_le : t -> pos:Base.int -> Base.Int64.t -> Base.unit
val set_int64_t_be : t -> pos:Base.int -> Base.Int64.t -> Base.unit
val unsafe_get_int64_t_le : t -> pos:Base.int -> Base.Int64.t
val unsafe_get_int64_t_be : t -> pos:Base.int -> Base.Int64.t
val unsafe_set_int64_t_le : t -> pos:Base.int -> Base.Int64.t -> Base.unit
val unsafe_set_int64_t_be : t -> pos:Base.int -> Base.Int64.t -> Base.unit
module Private = Base_bigstring.Private
include Hexdump.S with type t := t
type t
module Hexdump : sig ... end

Creation and string conversion

val create : ?⁠max_mem_waiting_gc:Core_kernel__.Byte_units0.t -> Core_kernel__.Import.int -> t

create length

parameter max_mem_waiting_gc

default = 256 M in OCaml <= 3.12, 1 G otherwise. As the total allocation of calls to create approach max_mem_waiting_gc, the pressure in the garbage collector to be more agressive will increase.

returns

a new bigstring having length. Content is undefined.

val sub_shared : ?⁠pos:Core_kernel__.Import.int -> ?⁠len:Core_kernel__.Import.int -> t -> t

sub_shared ?pos ?len bstr

returns

the sub-bigstring in bstr that starts at position pos and has length len. The sub-bigstring shares the same memory region, i.e. modifying it will modify the original bigstring. Holding on to the sub-bigstring will also keep the (usually bigger) original one around.

parameter pos

default = 0

parameter len

default = Bigstring.length bstr - pos

Reading/writing bin-prot

val write_bin_prot : t -> ?⁠pos:Core_kernel__.Import.int -> 'a Bin_prot.Type_class.writer -> 'a -> Core_kernel__.Import.int

write_bin_prot t writer a writes a to t starting at pos, and returns the index in t immediately after the last byte written. It raises if pos < 0 or if a doesn't fit in t.

val read_bin_prot : t -> ?⁠pos:Core_kernel__.Import.int -> ?⁠len:Core_kernel__.Import.int -> 'a Bin_prot.Type_class.reader -> ('a * Core_kernel__.Import.int) Or_error.t

The read_bin_prot* functions read from the region of t starting at pos of length len. They return the index in t immediately after the last byte read. They raise if pos and len don't describe a region of t.

val read_bin_prot_verbose_errors : t -> ?⁠pos:Core_kernel__.Import.int -> ?⁠len:Core_kernel__.Import.int -> 'a Bin_prot.Type_class.reader -> [ `Invalid_data of Error.t | `Not_enough_data | `Ok of 'a * Core_kernel__.Import.int ]

Destruction

val unsafe_destroy : t -> Core_kernel__.Import.unit

unsafe_destroy bstr destroys the bigstring by deallocating its associated data or, if memory-mapped, unmapping the corresponding file, and setting all dimensions to zero. This effectively frees the associated memory or address-space resources instantaneously. This feature helps working around a bug in the current OCaml runtime, which does not correctly estimate how aggressively to reclaim such resources.

This operation is safe unless you have passed the bigstring to another thread that is performing operations on it at the same time. Access to the bigstring after this operation will yield array bounds exceptions.

raises Failure

if the bigstring has already been deallocated (or deemed "external", which is treated equivalently), or if it has proxies, i.e. other bigstrings referring to the same data.

val unsafe_destroy_and_resize : t -> len:Core_kernel__.Import.int -> t

unsafe_destroy_and_resize bstr ~len reallocates the memory backing bstr and returns a new bigstring that starts at position 0 and has length len. If len is greater than length bstr then the newly allocated memory will not be initialized.

Similar to unsafe_destroy, this operation is safe unless you have passed the bigstring to another thread that is performing operations on it at the same time. Access to bstr after this operation will yield array bounds exceptions.

raises Failure

if the bigstring has already been deallocated (or deemed "external", which is treated equivalently), if it is backed by a memory map, or if it has proxies, i.e. other bigstrings referring to the same data.

val get_tail_padded_fixed_string : padding:Core_kernel__.Import.char -> t -> pos:Core_kernel__.Import.int -> len:Core_kernel__.Import.int -> Core_kernel__.Import.unit -> Core_kernel__.Import.string

Similar to Binary_packing.unpack_tail_padded_fixed_string and .pack_tail_padded_fixed_string.

val set_tail_padded_fixed_string : padding:Core_kernel__.Import.char -> t -> pos:Core_kernel__.Import.int -> len:Core_kernel__.Import.int -> Core_kernel__.Import.string -> Core_kernel__.Import.unit
val get_head_padded_fixed_string : padding:Core_kernel__.Import.char -> t -> pos:Core_kernel__.Import.int -> len:Core_kernel__.Import.int -> Core_kernel__.Import.unit -> Core_kernel__.Import.string
val set_head_padded_fixed_string : padding:Core_kernel__.Import.char -> t -> pos:Core_kernel__.Import.int -> len:Core_kernel__.Import.int -> Core_kernel__.Import.string -> Core_kernel__.Import.unit
module Unstable : sig ... end
module Stable : sig ... end