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(*----------------------------------------------------------------------------
Copyright (c) 2017 Inhabited Type LLC.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the author nor the names of his contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------*)
type t =
{ mutable parser_committed_bytes : int
; client_committed_bytes : int
; off : int
; len : int
; buffer : Bigstringaf.t
}
let create buffer ~off ~len ~committed_bytes =
{ parser_committed_bytes = committed_bytes
; client_committed_bytes = committed_bytes
; off
; len
; buffer }
let length t = t.client_committed_bytes + t.len
let client_committed_bytes t = t.client_committed_bytes
let parser_committed_bytes t = t.parser_committed_bytes
let committed_bytes_discrepancy t = t.parser_committed_bytes - t.client_committed_bytes
let bytes_for_client_to_commit t = committed_bytes_discrepancy t
let parser_uncommitted_bytes t = t.len - bytes_for_client_to_commit t
let invariant t =
assert (parser_committed_bytes t + parser_uncommitted_bytes t = length t);
assert (parser_committed_bytes t - client_committed_bytes t = bytes_for_client_to_commit t);
;;
let offset_in_buffer t pos =
t.off + pos - t.client_committed_bytes
let apply t pos len ~f =
let off = offset_in_buffer t pos in
f t.buffer ~off ~len
let unsafe_get_char t pos =
let off = offset_in_buffer t pos in
Bigstringaf.unsafe_get t.buffer off
let unsafe_get_int16_le t pos =
let off = offset_in_buffer t pos in
Bigstringaf.unsafe_get_int16_le t.buffer off
let unsafe_get_int32_le t pos =
let off = offset_in_buffer t pos in
Bigstringaf.unsafe_get_int32_le t.buffer off
let unsafe_get_int64_le t pos =
let off = offset_in_buffer t pos in
Bigstringaf.unsafe_get_int64_le t.buffer off
let unsafe_get_int16_be t pos =
let off = offset_in_buffer t pos in
Bigstringaf.unsafe_get_int16_be t.buffer off
let unsafe_get_int32_be t pos =
let off = offset_in_buffer t pos in
Bigstringaf.unsafe_get_int32_be t.buffer off
let unsafe_get_int64_be t pos =
let off = offset_in_buffer t pos in
Bigstringaf.unsafe_get_int64_be t.buffer off
let count_while t pos ~f =
let buffer = t.buffer in
let off = offset_in_buffer t pos in
let i = ref off in
let limit = t.off + t.len in
while !i < limit && f (Bigstringaf.unsafe_get buffer !i) do
incr i
done;
!i - off
;;
let commit t pos =
t.parser_committed_bytes <- pos
;;
|
