Removed screensaver functions to new lua file

frontend/ui/uitoolbox.lua

@@ -0,0 +1,125 @@
+local InputContainer = require("ui/widget/container/inputcontainer")
+
+local UIToolbox = InputContainer:new{
+}
+
+function UIToolbox:getPicture(file)
+
+    local contentopf
+    local contentpath
+    local epub_folder = "temp/epub"
+
+    local function check_extension(cover)
+        if cover then
+            local itype = string.lower(string.match(cover, ".+%.([^.]+)") or "")
+            if not (itype == "png" or itype == "jpg" or itype == "jpeg" or itype == "tiff") then
+                cover = nil
+            end
+         end
+         return cover
+    end
+
+    local function getValue(zipfile,which_line,to_find,excludecheck)
+        local f = io.open(zipfile,"r")
+        local i
+
+        if f then
+            local line = f:read()
+            while line and not i do
+                i = line:lower():find(which_line:lower()) -- found something
+                if i then
+                    f.close()
+                    line = line:match(to_find .. "\"([^\"]+)\".*")
+                    if not excludecheck then line = check_extension(line) end
+                    if line then
+                        return line
+                    else
+                        i = nil
+                    end
+                end
+                if not i then line = f:read() end
+            end
+            f.close()
+        end
+    end
+
+    local function guess(extension)
+        local cover = contentpath .. "Images/cover." .. extension
+        pcall(os.execute("unzip \"" .. file .. "\" \"" .. cover .. "\" -oq -d " .. epub_folder))
+        cover = epub_folder .. "/" .. cover
+        if not io.open(cover,"r") then
+            cover = nil
+        end
+        return cover
+    end
+
+    local function try_content_opf(which_line,to_find,addimage)
+        local cover = getValue(epub_folder .. "/" .. contentopf,which_line,to_find)
+        local imageadd
+        if cover then
+            if addimage then
+                imageadd = "Images/"
+            else
+                imageadd = ""
+            end
+            cover = contentpath .. imageadd .. cover
+            pcall(os.execute("unzip \"" .. file .. "\" \"" .. cover .. "\" -oq -d " .. epub_folder))
+            cover = epub_folder .. "/" .. cover
+            if not io.open(cover,"r") then cover = nil end
+        end
+        return check_extension(cover)
+    end
+    
+    local cover
+    if file then
+        pcall(lfs.mkdir("temp"))
+        pcall(os.execute("rm -rf " .. epub_folder))
+        pcall(lfs.mkdir(epub_folder))
+        pcall(os.execute("unzip \"" .. file .. "\" cover.jpeg -oq -d " .. epub_folder))
+        if io.open(epub_folder .. "/cover.jpeg","r") then                                          -- picture in main folder
+            cover = epub_folder .. "/cover.jpeg"                                                    -- found one
+        else
+            pcall(os.execute("unzip \"" .. file .. "\" \"META-INF/container.xml\" -oq -d " .. epub_folder)) -- read container.xml
+            contentopf = getValue(epub_folder .. "/META-INF/container.xml","^%s*<rootfile ","full[-]path=",true)
+            if contentopf then
+                contentpath = contentopf:match("(.*)[/][^/]+")
+                if contentpath then
+                    contentpath = contentpath .. "/"
+                else
+                    contentpath = ""
+                end
+
+                pcall(os.execute("unzip \"" .. file .. "\" \"" .. contentopf .. "\" -oq -d " .. epub_folder))  -- read content.opf
+
+                cover = try_content_opf("^%s*<meta name=\"cover\"","content=",true)  -- Make Room
+                if not cover then cover = try_content_opf('id="cover',"item href=",false) end -- Kishon
+                if not cover then cover = try_content_opf("cover","href=",true) end
+                if not cover then cover = try_content_opf("cover","=",true) end
+                if not cover then cover = try_content_opf("cover","=",false) end
+
+                if not cover then guess("jpg") end
+                if not cover then guess("jpeg") end
+                if not cover then guess("png") end
+            end
+        end
+    end
+    return check_extension(cover)
+end
+
+function UIToolbox:getRandomPicture(dir)
+    local pics = {}
+    local i = 0
+    math.randomseed( os.time() )
+    for entry in lfs.dir(dir) do
+        if lfs.attributes(dir .. entry, "mode") == "file" then
+            local extension = string.lower(string.match(entry, ".+%.([^.]+)") or "")
+            if extension == "jpg" or extension == "jpeg" or extension == "png" then
+                i = i + 1
+                pics[i] = entry
+            end
+        end
+    end
+    return pics[math.random(i)]
+end
+
+return UIToolbox