258 lines
7.1 KiB
Lua
258 lines
7.1 KiB
Lua
local solvitdb = {}
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local fs = require("filesystem")
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local function checkValidityAndOpen(path)
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local handle = assert(fs.open(path))
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local data = assert(handle:read(8))
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if data:sub(5, 8) == "RTFM" then
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local patLength = string.unpack("<I4", data:sub(1, 4))
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return handle, patLength
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else
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error("missing magic")
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end
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end
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local function readPat(handle, patLength)
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-- This needs the handle to be at byte 4
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local data, tmpdata = ""
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repeat
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tmpdata = handle:read(patLength - #data)
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data = data .. (tmpdata or "")
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until not tmpdata
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local packages = {}
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for packageData in data:gmatch("(.-%.....);") do
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packages[packageData:sub(1, -6)] = string.unpack("<I4", packageData:sub(-4, -1))
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end
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return packages
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end
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local function insert(filePath, location, bytes)
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local chunkLength = 512
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local readHandle = assert(fs.open(filePath, "r"))
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local tmpFilePath = filePath .. ".tmp"
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local writeHandle = assert(fs.open(tmpFilePath, "w"))
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local i = 0
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while true do
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local readAmount = chunkLength
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if readAmount > location - i then
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readAmount = location - i
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end
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if readAmount == 0 then
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break
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end
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local data = readHandle:read(readAmount)
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i = i + readAmount
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assert(writeHandle:write(data))
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end
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assert(writeHandle:write(bytes))
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while true do
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local data = readHandle:read(chunkLength)
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if not data then
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break
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end
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assert(writeHandle:write(data))
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end
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readHandle:close()
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writeHandle:close()
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fs.rename(tmpFilePath, filePath)
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end
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local function remove(filePath, location, length)
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local chunkLength = 512
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if length > 512 then
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chunkLength = length
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end
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-- The file has to get shortened, so I have no choice but to do these shenanigans
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local readHandle = assert(fs.open(filePath, "r"))
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local tmpFilePath = filePath .. ".tmp"
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local writeHandle = assert(fs.open(tmpFilePath, "w"))
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local i = 0
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while true do
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local readAmount = chunkLength
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if readAmount > location - i then
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readAmount = location - i
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end
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if readAmount == 0 then
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break
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end
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local data = readHandle:read(readAmount)
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i = i + readAmount
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assert(writeHandle:write(data))
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end
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readHandle:seek(length)
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while true do
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local data = readHandle:read(chunkLength)
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if not data then
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break
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end
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assert(writeHandle:write(data))
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end
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readHandle:close()
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writeHandle:close()
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fs.rename(tmpFilePath, filePath)
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end
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function solvitdb.create(path)
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checkArg(1, path, "string")
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local handle = assert(fs.open(path, "w"))
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assert(handle:write("\0\0\0\0RTFM"))
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handle:close()
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end
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function solvitdb.set(path, name, data)
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checkArg(1, path, "string")
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checkArg(2, name, "string")
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checkArg(3, data, "table")
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local readHandle, patLength = checkValidityAndOpen(path)
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local pat = readPat(readHandle, patLength)
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local writeHandle = assert(fs.open(path, "a"))
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if pat[name] then
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handle:seek(pat[name])
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local data, tmpdata = ""
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repeat
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tmpdata = readHandle:read(math.huge)
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oldData = oldData .. (tmpdata or "")
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until oldData:find("\n", 1, true) or not tmpdata
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readHandle:close()
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if not oldData:find("\n", 1, true) and not tmpdata then
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error("hit unexpected EOF")
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end
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oldData = oldData:match("^[^\n]+")
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local difference = #data - #oldData
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if difference == 0 then
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writeHandle:seek("set", pat[name] + patLength + 8)
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readHandle:close()
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writeHandle:write(data)
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elseif difference < 0 then
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elseif difference > 0 then
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end
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else
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writeHandle:seek("end")
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local newPackageLocation = writeHandle:seek() - patLength - 8
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if newPackageLocation > 4294967295 then
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-- The above is the 32 bit unsigned integer limit
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error("DB too large")
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end
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local encodedString
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if data.type == "package" then
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encodedString = "P"
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elseif data.type == "group" then
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encodedString = "G"
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elseif data.type == "virtual-package" then
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encodedString = "V"
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end
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if data.dependencies then
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encodedString = encodedString .. "d" .. table.concat(data.dependencies, ";") .. "."
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end
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if data.reverseDependencies then
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encodedString = encodedString .. "D" .. table.concat(data.reverseDependencies, ";") .. "."
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end
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if data.conflicts then
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encodedString = encodedString .. "c" .. table.concat(data.conflicts, ";") .. "."
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end
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if data.packages then
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encodedString = encodedString .. "p" .. table.concat(data.packages, ";") .. "."
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end
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if data.version then
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encodedString = encodedString .. "v" .. data.version .. "."
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end
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writeHandle:write(encodedString .. "\n")
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local patData = ("%s.%s;"):format(name, string.pack("<I4", newPackageLocation))
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insert(path, patLength + 8, patData)
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readHandle:close()
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local newPatLength = patLength + #patData
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writeHandle:seek("set", 0)
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if newPatLength > 4294967295 then
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error("PAT too large")
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end
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writeHandle:write(string.pack("<I4", newPatLength))
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writeHandle:close()
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end
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end
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function solvitdb.get(path, name)
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checkArg(1, path, "string")
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checkArg(2, name, "string")
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local handle, patLength = checkValidityAndOpen(path)
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local pat = readPat(handle, patLength)
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if not pat[name] then
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return nil
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end
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handle:seek(pat[name])
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local data, tmpdata = ""
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repeat
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tmpdata = handle:read(math.huge)
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data = data .. (tmpdata or "")
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until data:find("\n", 1, true) or not tmpdata
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handle:close()
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if not data:find("\n", 1, true) and not tmpdata then
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error("hit unexpected EOF")
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end
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data = data:match("^[^\n]+")
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local output = {}
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if data:sub(1, 1) == "P" then
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output.type = "package"
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elseif data:sub(1, 1) == "G" then
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output.type = "group"
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elseif data:sub(1, 1) == "V" then
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output.type = "virtual-package"
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else
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error("unknown package type")
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end
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data = "." .. data:sub(2, -1)
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for series in data:gmatch("%.([dDcp][^.]*)") do
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local seriesOutput
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if series:sub(1, 1) == "d" then
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output.dependencies = {}
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seriesOutput = output.dependencies
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elseif series:sub(1, 1) == "D" then
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output.reverseDependencies = {}
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seriesOutput = output.reverseDependencies
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elseif series:sub(1, 1) == "c" then
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output.conflicts = {}
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seriesOutput = output.conflicts
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elseif series:sub(1, 1) == "p" then
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output.packages = {}
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seriesOutput = output.packages
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elseif series:sub(1, 1) == "v" then
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output.version = series:sub(2, -1)
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goto SkipSeries
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end
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-- Finally a case where Lua's weird table linking shenanigans are actually useful
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series = series:sub(2, -1)
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for seriesItem in series:gmatch("[^;]+") do
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table.insert(seriesOutput, seriesItem)
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end
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::SkipSeries::
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end
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return output
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end
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function solvitdb.list(path)
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checkArg(1, path, "string")
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local handle, patLength = checkValidityAndOpen(path)
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local pat = readPat(handle, patLength)
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handle:close()
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local list = {}
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for index, _ in pairs(pat) do
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table.insert(list, index)
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end
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setmetatable(list, {
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__call = function(self)
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i, value = next(self, i)
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return i, value
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end,
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})
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return list
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end
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function solvitdb.remove()
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end
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return solvitdb
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