97 lines
2.3 KiB
Lua
97 lines
2.3 KiB
Lua
local m = {}
|
|
local mt = {}
|
|
|
|
local mt_name = "flatbuffers.view.mt"
|
|
|
|
local N = require("flatbuffers.numTypes")
|
|
local binaryarray = require("flatbuffers.binaryarray")
|
|
|
|
function m.New(buf, pos)
|
|
N.UOffsetT:EnforceNumber(pos)
|
|
|
|
-- need to convert from a string buffer into
|
|
-- a binary array
|
|
|
|
local o = {
|
|
bytes = type(buf) == "string" and binaryarray.New(buf) or buf,
|
|
pos = pos
|
|
}
|
|
setmetatable(o, {__index = mt, __metatable = mt_name})
|
|
return o
|
|
end
|
|
|
|
function mt:Offset(vtableOffset)
|
|
local vtable = self.pos - self:Get(N.SOffsetT, self.pos)
|
|
local vtableEnd = self:Get(N.VOffsetT, vtable)
|
|
if vtableOffset < vtableEnd then
|
|
return self:Get(N.VOffsetT, vtable + vtableOffset)
|
|
end
|
|
return 0
|
|
end
|
|
|
|
function mt:Indirect(off)
|
|
N.UOffsetT:EnforceNumber(off)
|
|
return off + N.UOffsetT:Unpack(self.bytes, off)
|
|
end
|
|
|
|
function mt:String(off)
|
|
N.UOffsetT:EnforceNumber(off)
|
|
off = off + N.UOffsetT:Unpack(self.bytes, off)
|
|
local start = off + N.UOffsetT.bytewidth
|
|
local length = N.UOffsetT:Unpack(self.bytes, off)
|
|
return self.bytes:Slice(start, start+length)
|
|
end
|
|
|
|
function mt:VectorLen(off)
|
|
N.UOffsetT:EnforceNumber(off)
|
|
off = off + self.pos
|
|
off = off + N.UOffsetT:Unpack(self.bytes, off)
|
|
return N.UOffsetT:Unpack(self.bytes, off)
|
|
end
|
|
|
|
function mt:Vector(off)
|
|
N.UOffsetT:EnforceNumber(off)
|
|
|
|
off = off + self.pos
|
|
local x = off + self:Get(N.UOffsetT, off)
|
|
x = x + N.UOffsetT.bytewidth
|
|
return x
|
|
end
|
|
|
|
function mt:Union(t2, off)
|
|
assert(getmetatable(t2) == mt_name)
|
|
N.UOffsetT:EnforceNumber(off)
|
|
|
|
off = off + self.pos
|
|
t2.pos = off + self:Get(N.UOffsetT, off)
|
|
t2.bytes = self.bytes
|
|
end
|
|
|
|
function mt:Get(flags, off)
|
|
N.UOffsetT:EnforceNumber(off)
|
|
return flags:Unpack(self.bytes, off)
|
|
end
|
|
|
|
function mt:GetSlot(slot, d, validatorFlags)
|
|
N.VOffsetT:EnforceNumber(slot)
|
|
if validatorFlags then
|
|
validatorFlags:EnforceNumber(d)
|
|
end
|
|
local off = self:Offset(slot)
|
|
if off == 0 then
|
|
return d
|
|
end
|
|
return self:Get(validatorFlags, self.pos + off)
|
|
end
|
|
|
|
function mt:GetVOffsetTSlot(slot, d)
|
|
N.VOffsetT:EnforceNumber(slot)
|
|
N.VOffsetT:EnforceNumber(d)
|
|
local off = self:Offset(slot)
|
|
if off == 0 then
|
|
return d
|
|
end
|
|
return off
|
|
end
|
|
|
|
return m |