104 lines
2.3 KiB
Lua
104 lines
2.3 KiB
Lua
local magic = 0x5f7d
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local magic_rev = 0x7d5f
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local header_fmt = "I2I2I2I2I2I6I6"
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local en = true
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local function get_end(e)
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return (e and "<") or ">"
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end
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local function read_header(dat)
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local e = get_end(en)
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local m = string.unpack(e.."I2", dat)
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if m ~= magic and m ~= magic_rev then return nil, string.format("bad magic (%.4x)", m) end
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if m ~= magic then
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e = get_end(not en)
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end
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local ent = {}
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ent.magic, ent.namesize, ent.mode, ent.uid, ent.gid, ent.filesize, ent.mtime = string.unpack(e..header_fmt, dat)
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return ent
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end
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local arc = {}
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function arc:fetch(path)
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for i=1, #self.tbl do
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if (self.tbl[i].name == path and self.tbl[i].mode & 32768 > 0) then
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self.seek(self.tbl[i].pos-self.seek(0))
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return self.read(self.tbl[i].filesize), self.tbl[i]
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end
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end
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return nil, "file not found"
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end
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function arc:exists(path)
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for i=1, #self.tbl do
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if (self.tbl[i].name == path) then
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return true
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end
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end
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return false
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end
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function arc:list(path)
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if path:sub(#path) ~= "/" then path = path .. "/" end
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local ent = {}
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for i=1, #self.tbl do
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if (self.tbl[i].name:sub(1, #path) == path and not self.tbl[i].name:find("/", #path+1, false)) then
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ent[#ent+1] = self.tbl[i].name
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end
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end
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return ent
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end
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function arc:stream(path)
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for i=1, #self.tbl do
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if (self.tbl[i].name == path and self.tbl[i].mode & 32768 > 0) then
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local pos = 1
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local function read(amt)
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self.seek(self.tbl[i].pos-self.seek(0)+pos-1)
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pos = pos + amt
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return self.read(amt)
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end
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local function seek(amt)
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pos = pos + amt
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return pos
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end
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local function close()end
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return read, seek, close
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end
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end
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return nil, "file not found"
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end
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function arc:close()
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self.close()
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end
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function arc:meta(path)
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for i=1, #self.tbl do
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if (self.tbl[i].name == path and self.tbl[i].mode & 32768 > 0) then
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return self.tbl[i]
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end
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end
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return nil, "file not found"
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end
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return {
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read = function(read, seek, close)
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local tbl = {}
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local lname = ""
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while lname ~= "TRAILER!!!" do
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local dat = read(22)
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local et = assert(read_header(dat))
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et.name = read(et.namesize)
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et.pos = seek(et.namesize & 1)
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local t = (et.filesize & 1)
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seek(et.filesize + t)
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lname = et.name
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if lname ~= "TRAILER!!!" then
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tbl[#tbl+1] = et
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end
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end
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return setmetatable({tbl = tbl, read = read, seek = seek, close = close}, {__index=arc})
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end
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} |