113 lines
2.4 KiB
Lua
113 lines
2.4 KiB
Lua
local mtar = require "libmtar"
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local w, lz16 = pcall(require, "liblz16")
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if not w then lz16 = nil end
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pkgfs = {}
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local findex = {}
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local handles = {}
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local hc = 0
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local function rfalse()
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return false
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end
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local function rzero()
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return 0
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end
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pkgfs.component = {seek = rfalse, makeDirectory = rfalse, write = rfalse, rename = rfalse, setlabel = rfalse, spaceUsed = rzero, spaceTotal = rzero, lastModified = rzero}
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local function fopen(path,comp)
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local f
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if comp and lz16 then
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f = lz16.open(path,"rb")
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else
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f = io.open(path,"rb")
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end
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return f
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end
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local function fnormalize(s)
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return table.concat(fs.segments(s),"/")
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end
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function pkgfs.component.list(path)
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path = fnormalize(path).."/"
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local ft,rt = {},{}
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for k,v in pairs(findex) do
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k="/"..k
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if k:match(path.."([^/]+)/.+") then
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ft[k:match(path.."([^/]+)/.+").."/"] = true
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elseif k:match(path.."([^/]+)") then
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ft[k:match(path.."([^/]+)")] = true
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end
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end
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for k,v in pairs(ft) do
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rt[#rt+1] = k
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end
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return rt
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end
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function pkgfs.component.isDirectory(path)
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path = fnormalize(path).."/"
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for k,v in pairs(findex) do
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k="/"..k
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if k:match(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 pkgfs.component.size(path)
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path=fnormalize(path)
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if not findex[path] then return false end
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local f = fopen(findex[path][1], findex[path][2])
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for fname, read, fsize in mtar.iter(f) do
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if fname == path then
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return fsize
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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 pkgfs.component.open(path,mode)
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path=fnormalize(path)
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if mode:find("w") or mode:find("a") or not findex[path] then
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return false
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end
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local f = fopen(findex[path][1],findex[path][2])
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for fname,read,fsize in mtar.iter(f) do
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if fname == path then
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hc = hc + 1
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handles[hc] = {read, f}
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return hc
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end
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end
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end
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function pkgfs.component.read(handle, n)
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if not handles[handle] then return false end
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local rv = handles[handle][1](n)
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if not rv then return nil end
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if rv:len() < 1 then return nil end
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return rv
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end
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function pkgfs.component.close(handle)
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if not handles[handle] then return false end
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handles[handle][2]:close()
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handles[handle] = nil
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return true
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end
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function pkgfs.add(fname,comp)
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local fname = "/"..fnormalize(os.getenv("PWD").."/"..fname)
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local f = fopen(fname,comp)
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if not fname then error("unable to open file") end
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print(fname)
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for name, read, fsize in mtar.iter(f) do
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findex[fnormalize(name)] = {fname,comp}
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end
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f:close()
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end
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return pkgfs
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