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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(raw_file_io_compressed).
-export([close/1, sync/1, datasync/1, truncate/1, advise/4, allocate/3,
position/2, write/2, pwrite/2, pwrite/3,
read_line/1, read/2, pread/2, pread/3]).
%% OTP internal.
-export([ipread_s32bu_p32bu/3, sendfile/8]).
-export([open_layer/3]).
-include("file_int.hrl").
open_layer(Filename, Modes, Options) ->
IsAppend = lists:member(append, Modes),
IsDeflate = lists:member(write, Modes),
IsInflate = lists:member(read, Modes),
if
IsDeflate, IsInflate; IsAppend ->
{error, einval};
IsDeflate, not IsInflate ->
start_server_module(raw_file_io_deflate, Filename, Modes, Options);
IsInflate ->
start_server_module(raw_file_io_inflate, Filename, Modes, Options)
end.
start_server_module(Module, Filename, Modes, Options) ->
Secret = make_ref(),
case gen_statem:start(Module, {self(), Secret, Options}, []) of
{ok, Pid} -> open_next_layer(Pid, Secret, Filename, Modes);
Other -> Other
end.
open_next_layer(Pid, Secret, Filename, Modes) ->
case gen_statem:call(Pid, {'$open', Secret, Filename, Modes}, infinity) of
ok ->
PublicFd = #file_descriptor{
module = raw_file_io_compressed, data = {self(), Pid} },
{ok, PublicFd};
Other -> Other
end.
close(Fd) ->
wrap_call(Fd, [close]).
sync(Fd) ->
wrap_call(Fd, [sync]).
datasync(Fd) ->
wrap_call(Fd, [datasync]).
truncate(Fd) ->
wrap_call(Fd, [truncate]).
advise(Fd, Offset, Length, Advise) ->
wrap_call(Fd, [advise, Offset, Length, Advise]).
allocate(Fd, Offset, Length) ->
wrap_call(Fd, [allocate, Offset, Length]).
position(Fd, Mark) ->
wrap_call(Fd, [position, Mark]).
write(Fd, IOData) ->
try
CompactedData = erlang:iolist_to_iovec(IOData),
wrap_call(Fd, [write, CompactedData])
catch
error:badarg -> {error, badarg}
end.
pwrite(Fd, Offset, IOData) ->
try
CompactedData = erlang:iolist_to_iovec(IOData),
wrap_call(Fd, [pwrite, Offset, CompactedData])
catch
error:badarg -> {error, badarg}
end.
pwrite(Fd, LocBytes) ->
try
CompactedLocBytes =
[ {Offset, erlang:iolist_to_iovec(IOData)} ||
{Offset, IOData} <- LocBytes ],
wrap_call(Fd, [pwrite, CompactedLocBytes])
catch
error:badarg -> {error, badarg}
end.
read_line(Fd) ->
wrap_call(Fd, [read_line]).
read(Fd, Size) ->
wrap_call(Fd, [read, Size]).
pread(Fd, Offset, Size) ->
wrap_call(Fd, [pread, Offset, Size]).
pread(Fd, LocNums) ->
wrap_call(Fd, [pread, LocNums]).
ipread_s32bu_p32bu(Fd, Offset, MaxSize) ->
wrap_call(Fd, [ipread_s32bu_p32bu, Offset, MaxSize]).
sendfile(_,_,_,_,_,_,_,_) ->
{error, enotsup}.
wrap_call(Fd, Command) ->
{_Owner, Pid} = get_fd_data(Fd),
try gen_statem:call(Pid, Command, infinity) of
Result -> Result
catch
exit:{noproc, _StackTrace} -> {error, einval}
end.
get_fd_data(#file_descriptor{ data = Data }) ->
{Owner, _ServerPid} = Data,
case self() of
Owner -> Data;
_ -> error(not_on_controlling_process)
end.
|
