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Added check to prevent sparse arrays > 100 getting through

pull/28/head
Milind Gupta 2023-11-24 21:41:40 -08:00
parent f521e4ac03
commit 75127d2c7d
1 changed files with 34 additions and 33 deletions
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67
json.lua
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@ -57,18 +57,19 @@ end
local function encode_table(val, stack)
local res = {}
stack = stack or {}
local res = {}
stack = stack or {}
-- Circular reference?
if stack[val] then error("circular reference") end
-- Circular reference?
if stack[val] then error("circular reference") end
stack[val] = true
-- Check whether to treat as a array or object
local array = true
local length = 0
stack[val] = true
-- Check whether to treat as a array or object
local array = true
local length = 0
local nLen = 0
for k,v in pairs(val) do
local count = 0
for k,v in pairs(val) do
if (type(k) ~= "number" or k<=0) and not (k == "n" and type(v) == "number") then
array = nil
break -- Treat as object
@ -79,33 +80,33 @@ local function encode_table(val, stack)
if k == "n" and type(v) == "number" then
nLen = v
end
count = count + 1
end
end
end
if array then
if nLen > length then
length = nLen
if nLen > length then
length = nLen
end
if array and not (length > 100 and count ~= length) then -- Check Array detected but sparse > 100 length then treat as object
-- Encode
for i=1,length do
table.insert(res, encode(val[i], stack))
end
-- Encode
for i=1,length do
table.insert(res, encode(val[i], stack))
end
stack[val] = nil
return "[" .. table.concat(res, ",") .. "]"
else
-- Treat as an object
for k, v in pairs(val) do
--[[
if type(k) ~= "string" then
error("invalid table: mixed or invalid key types")
end
]]
table.insert(res, encode(k, stack) .. ":" .. encode(v, stack))
end
stack[val] = nil
return "{" .. table.concat(res, ",") .. "}"
end
stack[val] = nil
return "[" .. table.concat(res, ",") .. "]"
else
-- Treat as an object
for k, v in pairs(val) do
--[[
if type(k) ~= "string" then
error("invalid table: mixed or invalid key types")
end
]]
table.insert(res, encode(k, stack) .. ":" .. encode(v, stack))
end
stack[val] = nil
return "{" .. table.concat(res, ",") .. "}"
end
end