68 lines
2.9 KiB
OCaml
68 lines
2.9 KiB
OCaml
(**************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1997 Institut National de Recherche en Informatique et *)
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(* en Automatique. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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type extern_flags =
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No_sharing
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| Closures
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| Compat_32
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(* note: this type definition is used in 'runtime/debugger.c' *)
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external to_channel: out_channel -> 'a -> extern_flags list -> unit
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= "caml_output_value"
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external to_bytes: 'a -> extern_flags list -> bytes
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= "caml_output_value_to_bytes"
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external to_string: 'a -> extern_flags list -> string
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= "caml_output_value_to_string"
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external to_buffer_unsafe:
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bytes -> int -> int -> 'a -> extern_flags list -> int
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= "caml_output_value_to_buffer"
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let to_buffer buff ofs len v flags =
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if ofs < 0 || len < 0 || ofs > Bytes.length buff - len
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then invalid_arg "Marshal.to_buffer: substring out of bounds"
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else to_buffer_unsafe buff ofs len v flags
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(* The functions below use byte sequences as input, never using any
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mutation. It makes sense to use non-mutated [bytes] rather than
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[string], because we really work with sequences of bytes, not
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a text representation.
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*)
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external from_channel: in_channel -> 'a = "caml_input_value"
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external from_bytes_unsafe: bytes -> int -> 'a = "caml_input_value_from_bytes"
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external data_size_unsafe: bytes -> int -> int = "caml_marshal_data_size"
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let header_size = 20
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let data_size buff ofs =
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if ofs < 0 || ofs > Bytes.length buff - header_size
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then invalid_arg "Marshal.data_size"
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else data_size_unsafe buff ofs
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let total_size buff ofs = header_size + data_size buff ofs
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let from_bytes buff ofs =
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if ofs < 0 || ofs > Bytes.length buff - header_size
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then invalid_arg "Marshal.from_bytes"
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else begin
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let len = data_size_unsafe buff ofs in
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if ofs > Bytes.length buff - (header_size + len)
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then invalid_arg "Marshal.from_bytes"
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else from_bytes_unsafe buff ofs
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end
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let from_string buff ofs =
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(* Bytes.unsafe_of_string is safe here, as the produced byte
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sequence is never mutated *)
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from_bytes (Bytes.unsafe_of_string buff) ofs
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