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%%
%% Licensed to the Apache Software Foundation (ASF) under one
%% or more contributor license agreements. See the NOTICE file
%% distributed with this work for additional information
%% regarding copyright ownership. The ASF licenses this file
%% to you 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.
%%
-module(thrift_memory_buffer).
-behaviour(thrift_transport).
%% API
-export([new/0, new/1, new_transport_factory/0]).
%% thrift_transport callbacks
-export([write/2, read/2, flush/1, close/1]).
-record(memory_buffer, {buffer}).
-type state() :: #memory_buffer{}.
-include("thrift_transport_behaviour.hrl").
new() ->
State = #memory_buffer{buffer = []},
thrift_transport:new(?MODULE, State).
new (Buf) when is_list (Buf) ->
State = #memory_buffer{buffer = Buf},
thrift_transport:new(?MODULE, State);
new (Buf) ->
State = #memory_buffer{buffer = [Buf]},
thrift_transport:new(?MODULE, State).
new_transport_factory() ->
{ok, fun() -> new() end}.
%% Writes data into the buffer
write(State = #memory_buffer{buffer = Buf}, Data) ->
{State#memory_buffer{buffer = [Buf, Data]}, ok}.
flush(State = #memory_buffer {buffer = Buf}) ->
{State#memory_buffer{buffer = []}, Buf}.
close(State) ->
{State, ok}.
read(State = #memory_buffer{buffer = Buf}, Len) when is_integer(Len) ->
Binary = iolist_to_binary(Buf),
Give = min(iolist_size(Binary), Len),
{Result, Remaining} = split_binary(Binary, Give),
{State#memory_buffer{buffer = Remaining}, {ok, Result}}.
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