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net.websocket.frames: Use struct packing in Lua 5.3 or struct lib if available

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This commit is contained in:
Kim Alvefur 2015-10-06 18:05:27 +02:00
parent 2efcb9f82f
commit 0ce785a39c
1 changed files with 25 additions and 0 deletions
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25
net/websocket/frames.lua
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@ -22,6 +22,13 @@ local t_concat = table.concat;
local s_byte = string.byte;
local s_char= string.char;
local s_sub = string.sub;
local s_pack = string.pack;
local s_unpack = string.unpack;
if not s_pack and softreq"struct" then
s_pack = softreq"struct".pack;
s_unpack = softreq"struct".unpack;
end
local function read_uint16be(str, pos)
local l1, l2 = s_byte(str, pos, pos+1);
@ -46,6 +53,24 @@ local function pack_uint64be(x)
get_byte(x, 24), get_byte(x, 16), get_byte(x, 8), band(x, 0xFF);
end
if s_pack then
function pack_uint16be(x)
return s_pack(">I2", x);
end
function pack_uint64be(x)
return s_pack(">I8", x);
end
end
if s_unpack then
function read_uint16be(str, pos)
return s_unpack(">I2", str, pos);
end
function read_uint64be(str, pos)
return s_unpack(">I8", str, pos);
end
end
local function parse_frame_header(frame)
if #frame < 2 then return; end