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-----------------------------------------------------------------------------
-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements.
-- 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.
-----------------------------------------------------------------------------
-- Buffered Class
-- by christian liesch <liesch@gmx.ch>
-----------------------------------------------------------------------------
Buffered = {transport = nil, buffer = nil, pos = nil}
-- Constructor
-- @param t IN htt transport object
-- @return buffered object
function Buffered:new(t)
o = {transport = t, buffer = t:read(8192), pos = 1}
setmetatable(o, self)
self.__index = self
return o
end
-- Line iterator
-- @return next line and self
function Buffered:lines()
return self.readline, self
end
-- read line excluding \r\n
-- @return line
function Buffered:readline()
local chunks = {}
while (self.buffer) do
local s, e = string.find(self.buffer, "[^\r\n]*\r\n", self.pos)
if s then
self.pos = e + 1
table.insert(chunks, string.sub(self.buffer, s, e-2))
local line = table.concat(chunks)
chunks = nil
return line
else
table.insert(chunks, string.sub(self.buffer, self.pos))
self.buffer = self.transport:read(8192)
self.pos = 1
end
end
return nil
end
-- Read a number of bytes
-- @param len IN bytes to read
-- @return received bytes
function Buffered:read(len)
local rest_len = string.len(self.buffer) - self.pos + 1
if (len == 0) then
return ""
end
if (len <= rest_len) then
local block = string.sub(self.buffer, self.pos, self.pos + len - 1)
self.pos = self.pos + len
return block
end
local chunks = {}
local real_len = len - rest_len
table.insert(chunks, string.sub(self.buffer, self.pos))
while real_len > 0 do
self.buffer = self.transport:read(real_len)
real_len = real_len - string.len(self.buffer)
table.insert(chunks, self.buffer)
end
local block = table.concat(chunks)
chunks = nil
return block
end
-- Read until eof
-- @return received bytes
function Buffered:readeof()
local chunks = {}
while (self.buffer) do
table.insert(chunks, string.sub(self.buffer, self.pos))
self.pos = 1
self.buffer = self.transport:read(8192)
end
local block = table.concat(chunks)
chunks = nil
return block
end
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