LÖVE

grump wrote: ↑Wed Nov 28, 2018 8:02 am ...
The save code is fine as is and should work as expected.

MissDanish wrote: ↑Wed Nov 28, 2018 6:12 am

Code: Select all

function saves_load()
  if love.filesystem.getInfo(saveListPath) ~= nil then
    saves = BlobReader(love.filesystem.read(saveListPath))
  end
end

grump wrote: ↑Wed Nov 28, 2018 8:02 am love.filesystem.read returns data and size; you can't pass the call result directly to BlobReader(), because it expects the optional second parameter to be byte order, not size.

function saves_load()
  if love.filesystem.getInfo(saveListPath) ~= nil then
    saves = BlobReader((love.filesystem.read(saveListPath)))
  end
end

pgimeno wrote: ↑Wed Nov 28, 2018 11:32 am If that's the issue, then just adding parentheses suffices:

local BlobReader = require('BlobReader')
local r = BlobReader(love.filesystem.read('main.lua'))
print(r:raw(r:size()))

yetneverdone wrote: ↑Fri Jan 25, 2019 1:50 am Hi, it says support for c data type. Would this be compatible for https://github.com/novemberisms/brinevector
?

local v = Vector(23, 42)

-- serialize 
local w = BlobWriter()
w:number(v.x):number(v.y)

-- deserialize
local r = BlobReader(w:tostring())
v = Vector(r:number(), r:number())

local t = { Vector(23, 42) }
BlobWriter():write(t) -- error, can't serialize cdata in tables

local v = Vector(23, 42)
local w = BlobWriter()
w:table(v) -- works

local r = BlobReader(w:tostring())
local v = r:table()
print(v.x, v.y) -- works
print(v.length) -- does not work, v is a plain table, not a Vector

v = Vector(v.x, v.y) -- now v is a Vector again
print(v.length) -- works

local v = Vector(23, 42)
local w = BlobWriter()
w:raw(v, ffi.sizeof(v))

local r = BlobReader(w:tostring())
local v2 = ffi.cast('brinevector*', r:raw(ffi.sizeof('brinevector')))
print(v2.x, v2.y, v2.length)

grump wrote: ↑Fri Jan 25, 2019 8:50 am

yetneverdone wrote: ↑Fri Jan 25, 2019 1:50 am Hi, it says support for c data type. Would this be compatible for https://github.com/novemberisms/brinevector
?

Not fully.

This works:

Code: Select all

local v = Vector(23, 42)

-- serialize 
local w = BlobWriter()
w:number(v.x):number(v.y)

-- deserialize
local r = BlobReader(w:tostring())
v = Vector(r:number(), r:number())

Serializing tables that contain Vectors is not supported. (I'm thinking about adding support for this)

Code: Select all

local t = { Vector(23, 42) }
BlobWriter():write(t) -- error, can't serialize cdata in tables

Serializing them directly with BlobWriter:table works, but that has drawbacks. BlobReader can't automatically recreate the Vector object.

Code: Select all

local v = Vector(23, 42)
local w = BlobWriter()
w:table(v) -- works

When you read this back, it becomes a plain table:

Code: Select all

local r = BlobReader(w:tostring())
local v = r:table()
print(v.x, v.y) -- works
print(v.length) -- does not work, v is a plain table, not a Vector

v = Vector(v.x, v.y) -- now v is a Vector again
print(v.length) -- works

EDIT: this will also work:

Code: Select all

local v = Vector(23, 42)
local w = BlobWriter()
w:raw(v, ffi.sizeof(v))

local r = BlobReader(w:tostring())
local v2 = ffi.cast('brinevector*', r:raw(ffi.sizeof('brinevector')))
print(v2.x, v2.y, v2.length)

I will add some code to simplify this a bit.

yetneverdone wrote: ↑Wed Jan 30, 2019 4:59 am Thanks! Yeah, vector support is really needed since serialization is used for saving objects.

Xii wrote: ↑Fri Feb 12, 2021 2:31 pm Still no support for cdata.

grump wrote: ↑Fri Feb 12, 2021 3:47 pm cdata is supported. :raw can read and write cdata just fine.

local blob = BlobWriter()
blob:write(data)

grump wrote: ↑Fri Feb 12, 2021 3:47 pm All cdata has the same type ("cdata"). There is no ffi API that provides more detailled type information, which makes fully transparent support of cdata somewhat difficult to implement.