mirror of
https://github.com/Adorable-Catgirl/Zorya-NEO.git
synced 2024-11-23 18:58:06 +11:00
304 lines
6.5 KiB
Lua
304 lines
6.5 KiB
Lua
-- P A I N
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local flag_crit = 1 << 5
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local flag_required = 1 << 6
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local flag_ext = 1 << 7
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local function read_ali(fs, h)
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local tmp = 0
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local ctr = 0
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while true do
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local b = fs.read(h, 1):byte()
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tmp = tmp | ((b & 0x7F) << (ctr*7))
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if (b & 0x80 > 0) then
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break
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end
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end
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return tmp
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end
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local function read_int(fs, h, count)
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local tmp = 0
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for i=0, count-1 do
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tmp = tmp | (fs.read(h, 1):byte() << (count*8))
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end
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return tmp
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end
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local function read_string(fs, h)
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local len = read_ali(fs, h)
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return fs.read(h, len)
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end
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local xdec = {
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["NAME"] = function(fs, h)
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return read_string(fs, h)
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end,
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["PERM"] = function(fs, h)
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return read_int(fs, h, 2)
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end,
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["W32P"] = function(fs, h)
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return fs.read(h, 1):byte()
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end,
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["OTIM"] = function(fs, h)
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return read_int(fs, h, 8)
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end,
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["MTIM"] = function(fs, h)
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return read_int(fs, h, 8)
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end,
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["CTIM"] = function(fs, h)
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return read_int(fs, h, 8)
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end,
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["ATIM"] = function(fs, h)
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return read_int(fs, h, 8)
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end,
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["SCOS"] = function(fs, h)
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return read_string(fs, h)
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end
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}
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local decode = {
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["X"] = function(fs, h, size)
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local oid = read_ali(fs, h)
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local xtype = fs.read(h, 4)
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return {
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type = "meta",
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id = oid,
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key = xtype,
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value = xdec[xtype](fs, h)
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}
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end,
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["F"] = function(fs, h, size)
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return {
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type="file",
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name = read_string(fs, h),
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offset = read_ali(fs, h),
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size = read_ali(fs, h),
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id = read_ali(fs, h),
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pid = read_ali(fs, h)
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}
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end,
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["D"] = function(fs, h, size)
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return {
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type="dir",
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name = read_string(fs, h),
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id = read_ali(fs, h),
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pid = read_ali(fs, h)
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}
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end,
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["Z"] = function(fs, h, size)
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return {
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type="eoh",
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size = read_ali(fs, h)
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}
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end
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}
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local function read_entrydat(fs, h)
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local etype = fs.read(h, 1)
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local ebyte = etype:byte()
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local size = read_ali(fs, h)
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if (ebyte & flag_crit > 0 and not decode[etype]) then error("Unknown critical entry.") end
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if (ebyte & flag_required == 0) then error("Required flag not set.") end
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if (decode[etype]) then
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return decode[etype](fs, h, size)
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end
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return {type="unknown"}
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end
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local function get_offset(fs, h)
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fs.seek(h, "set", 9)
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local ent = {}
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while ent.type ~= "eoh" do
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ent = read_entrydat(fs, h)
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end
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return fs.seek(h, "cur", 0), ent.size
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end
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local function path_part_iter(path)
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path = path:gsub("/+", "/"):gsub("^/", ""):gsub("/$", "")
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local lpos = 1
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return function()
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if not lpos then return nil end
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local s, e = path:find("(.-)/", lpos)
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if not s then
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local lp = lpos
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lpos = nil
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return path:sub(lp)
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end
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local rtn = path:sub(s, e-1)
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lpos = e+1
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return rtn
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end
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end
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local unpack = unpack or table.unpack
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local function sfpcall(a, func, ...)
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local ptr = a.fs.seek(a.h, "cur", 0)
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local rv = {func(...)}
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a.fs.seek(a.h, "set", ptr)
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return unpack(rv)
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end
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local function cache_obj(a, objdat)
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a.cache = a.cache or {}
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a.cache[#a.cache+1] = objdat
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end
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local function get_obj_prop(a, obj, name)
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name = name:upper()
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if (a.cache) then
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for i=1, #a.cache do
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if (a.cache[i].type=="meta" and a.cache[i].id==obj and a.cache[i].key == name) then return a.cache[i].value end
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end
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end
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fs.seek(h, "set", 9)
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local ent = {}
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while ent.type ~= "eoh" do
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ent = read_entrydat(fs, h)
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if (ent.type=="meta" and ent.id==obj and ent.key == name) then
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cache_obj(a, ent)
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return ent.value
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end
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end
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end
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local function path_to_obj(a, path)
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if (path == "/" or path == "") then
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return {
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type = "dir",
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name = "/root\\",
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id = 0,
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pid = 0
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}
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end
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local tbl = {}
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for p in path_part_iter(path) do
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tbl[#tbl+1] = p
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end
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local part = 1
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local pid = 0
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--search cache
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if (a.cache) then
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local i = 0
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while i < #a.cache do
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i = i+1
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if (a.cache[i].type == "file" or a.cache[i].type == "dir") then
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if (a.cache[i].pid == pid and (a.cache[i].name == tbl[part] or get_obj_prop(a, a.cache[i].id, "NAME") == tbl[part])) then
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part = part+1
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pid = a.cache[i].id
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i=0
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if (part == #tbl) then
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return a.cache[i], pid
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end
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end
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end
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end
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end
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-- Now we search the hard way, then cache along the way.
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fs.seek(h, "set", 9)
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local ent = {}
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while ent.type ~= "eoh" do
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ent = read_entrydat(fs, h)
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if (ent.type == "file" or ent.type=="dir") then
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if (ent.name == tbl[part] or sfpcall(get_obj_prop, a, ent.id, "NAME") == tbl[part]) then
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pid = ent.id
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cache_obj(a, ent)
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part = part + 1
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end
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if (part == #tbl) then
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break
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end
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end
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end
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return ent, pid
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end
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local function get_by_id(a, id)
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if (a.cache) then
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for i=1, #a.cache do
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if ((a.cache[i].type=="file" or a.cache[i].type=="dir") and a.cache[i].id==id) then return a.cache[i] end
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end
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end
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fs.seek(h, "set", 9)
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local ent = {}
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while ent.type ~= "eoh" do
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ent = read_entrydat(fs, h)
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if ((ent.type=="file" or ent.type=="dir") and ent.id==id) then
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cache_obj(a, ent)
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return ent
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end
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end
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end
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local function id_to_path(a, id)
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local ne = get_by_id(a, id)
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if not ne then return nil, "not found" end
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local path = get_obj_prop(a, id, "NAME") or ne.name
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path = "/" .. path
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while ne and ne.pid > 0 do
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ne = get_by_id(a, ne.pid)
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if not ne then return nil, "not found" end
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path = "/" .. (get_obj_prop(a, ne.id, "NAME") or ne.name) .. path
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end
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return path
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end
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local urf = {}
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function urf.open(drive, path)
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local fs = component.proxy(drive)
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local hand = fs.open(path)
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if fs.read(hand, 8) ~= "URF\x11\1\1\x12\0" then return nil, "bad signature" end
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local e, z = get_offset(fs, hand)
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return setmetatable({
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fs = fs,
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h = hand,
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cache = {},
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epos = e,
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bsize = z
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}, {__index=arc})
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end
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local arc = {}
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function arc:fetch(path)
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local obj = path_to_obj(self, path)
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if (obj.type ~= "file") then return nil, "not a file" end
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self.fs.seek(self.h, "set", self.epos+obj.offset)
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return self.fs.read(self.h, obj.size)
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end
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function arc:exists(path)
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local obj = path_to_obj(path)
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return obj.type ~= "eoh"
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end
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function arc:close()
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self.cache = nil
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self.fs.close(self.h)
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self.fs = nil
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end
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function arc:list_dir(path)
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local obj = path_to_obj(self, path)
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if (obj.type ~= "dir") then return nil, "not a dir" end
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local objects = {}
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for i=1, self.cache do
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if (self.cache[i].pid == obj.id) then
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objects[#objects+1] = (get_obj_prop(self, self.cache[i].id, "NAME") or self.cache[i].name)
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end
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end
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self.fs.seek(self.h, "set", 9)
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local ent = {}
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while ent.type ~= "eoh" do
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ent = read_entrydat(self.fs, self.h)
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if ((ent.type=="file" or ent.type=="dir") and ent.pid==obj.id) then
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cache_obj(self, ent)
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objects[#objects+1] = sfpcall(get_obj_prop, self, ent.id, "NAME") or ent.name
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end
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end
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return objects
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end
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return urf |