luci-base: move some generic classes into a separate luci-base-libs package

The new package luci-base-libs provides the modules that not strictly relate
to the web-interface of luci. By separating these libs they can be used by
other packages without having to install the web-components.
This change was inspired by providing a shell-only interface for 4MB-flash
devices, by keeping as much code common with a full install.

Signed-off-by: Sven Roederer <freifunk@it-solutions.geroedel.de>

1 files changed, 316 insertions, 0 deletions

diff --git a/libs/luci-lib-base/luasrc/ltn12.lua b/libs/luci-lib-base/luasrc/ltn12.lua
new file mode 100644
index 0000000000..3a7268ccae
--- /dev/null
+++ b/libs/luci-lib-base/luasrc/ltn12.lua
@@ -0,0 +1,316 @@
+--[[
+LuaSocket 2.0.2 license
+Copyright � 2004-2007 Diego Nehab
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+]]--
+--[[
+	Changes made by LuCI project:
+		* Renamed to luci.ltn12 to avoid collisions with luasocket
+		* Added inline documentation
+]]--
+-----------------------------------------------------------------------------
+-- LTN12 - Filters, sources, sinks and pumps.
+-- LuaSocket toolkit.
+-- Author: Diego Nehab
+-- RCS ID: $Id$
+-----------------------------------------------------------------------------
+
+-----------------------------------------------------------------------------
+-- Declare module
+-----------------------------------------------------------------------------
+local string = require("string")
+local table = require("table")
+local base = _G
+
+-- See http://lua-users.org/wiki/FiltersSourcesAndSinks for design concepts 
+module("luci.ltn12")
+
+filter = {}
+source = {}
+sink = {}
+pump = {}
+
+-- 2048 seems to be better in windows...
+BLOCKSIZE = 2048
+_VERSION = "LTN12 1.0.1"
+
+-----------------------------------------------------------------------------
+-- Filter stuff
+-----------------------------------------------------------------------------
+
+
+-- by passing it each chunk and updating a context between calls. 
+function filter.cycle(low, ctx, extra)
+    base.assert(low)
+    return function(chunk)
+        local ret
+        ret, ctx = low(ctx, chunk, extra)
+        return ret
+    end
+end
+
+-- (thanks to Wim Couwenberg)
+function filter.chain(...)
+    local n = table.getn(arg)
+    local top, index = 1, 1
+    local retry = ""
+    return function(chunk)
+        retry = chunk and retry
+        while true do
+            if index == top then
+                chunk = arg[index](chunk)
+                if chunk == "" or top == n then return chunk
+                elseif chunk then index = index + 1
+                else
+                    top = top+1
+                    index = top
+                end
+            else
+                chunk = arg[index](chunk or "")
+                if chunk == "" then
+                    index = index - 1
+                    chunk = retry
+                elseif chunk then
+                    if index == n then return chunk
+                    else index = index + 1 end
+                else base.error("filter returned inappropriate nil") end
+            end
+        end
+    end
+end
+
+-----------------------------------------------------------------------------
+-- Source stuff
+-----------------------------------------------------------------------------
+
+
+-- create an empty source
+local function empty()
+    return nil
+end
+
+function source.empty()
+    return empty
+end
+
+function source.error(err)
+    return function()
+        return nil, err
+    end
+end
+
+function source.file(handle, io_err)
+    if handle then
+        return function()
+            local chunk = handle:read(BLOCKSIZE)
+            if chunk and chunk:len() == 0 then chunk = nil end
+            if not chunk then handle:close() end
+            return chunk
+        end
+    else return source.error(io_err or "unable to open file") end
+end
+
+function source.simplify(src)
+    base.assert(src)
+    return function()
+        local chunk, err_or_new = src()
+        src = err_or_new or src
+        if not chunk then return nil, err_or_new
+        else return chunk end
+    end
+end
+
+function source.string(s)
+    if s then
+        local i = 1
+        return function()
+            local chunk = string.sub(s, i, i+BLOCKSIZE-1)
+            i = i + BLOCKSIZE
+            if chunk ~= "" then return chunk
+            else return nil end
+        end
+    else return source.empty() end
+end
+
+function source.rewind(src)
+    base.assert(src)
+    local t = {}
+    return function(chunk)
+        if not chunk then
+            chunk = table.remove(t)
+            if not chunk then return src()
+            else return chunk end
+        else
+            t[#t+1] = chunk
+        end
+    end
+end
+
+function source.chain(src, f)
+    base.assert(src and f)
+    local last_in, last_out = "", ""
+    local state = "feeding"
+    local err
+    return function()
+        if not last_out then
+            base.error('source is empty!', 2)
+        end
+        while true do
+            if state == "feeding" then
+                last_in, err = src()
+                if err then return nil, err end
+                last_out = f(last_in)
+                if not last_out then
+                    if last_in then
+                        base.error('filter returned inappropriate nil')
+                    else
+                        return nil
+                    end
+                elseif last_out ~= "" then
+                    state = "eating"
+                    if last_in then last_in = "" end
+                    return last_out
+                end
+            else
+                last_out = f(last_in)
+                if last_out == "" then
+                    if last_in == "" then
+                        state = "feeding"
+                    else
+                        base.error('filter returned ""')
+                    end
+                elseif not last_out then
+                    if last_in then
+                        base.error('filter returned inappropriate nil')
+                    else
+                        return nil
+                    end
+                else
+                    return last_out
+                end
+            end
+        end
+    end
+end
+
+-- Sources will be used one after the other, as if they were concatenated
+-- (thanks to Wim Couwenberg)
+function source.cat(...)
+    local src = table.remove(arg, 1)
+    return function()
+        while src do
+            local chunk, err = src()
+            if chunk then return chunk end
+            if err then return nil, err end
+            src = table.remove(arg, 1)
+        end
+    end
+end
+
+-----------------------------------------------------------------------------
+-- Sink stuff
+-----------------------------------------------------------------------------
+
+
+function sink.table(t)
+    t = t or {}
+    local f = function(chunk, err)
+        if chunk then t[#t+1] = chunk end
+        return 1
+    end
+    return f, t
+end
+
+function sink.simplify(snk)
+    base.assert(snk)
+    return function(chunk, err)
+        local ret, err_or_new = snk(chunk, err)
+        if not ret then return nil, err_or_new end
+        snk = err_or_new or snk
+        return 1
+    end
+end
+
+function sink.file(handle, io_err)
+    if handle then
+        return function(chunk, err)
+            if not chunk then
+                handle:close()
+                return 1
+            else return handle:write(chunk) end
+        end
+    else return sink.error(io_err or "unable to open file") end
+end
+
+-- creates a sink that discards data
+local function null()
+    return 1
+end
+
+function sink.null()
+    return null
+end
+
+function sink.error(err)
+    return function()
+        return nil, err
+    end
+end
+
+function sink.chain(f, snk)
+    base.assert(f and snk)
+    return function(chunk, err)
+        if chunk ~= "" then
+            local filtered = f(chunk)
+            local done = chunk and ""
+            while true do
+                local ret, snkerr = snk(filtered, err)
+                if not ret then return nil, snkerr end
+                if filtered == done then return 1 end
+                filtered = f(done)
+            end
+        else return 1 end
+    end
+end
+
+-----------------------------------------------------------------------------
+-- Pump stuff
+-----------------------------------------------------------------------------
+
+
+function pump.step(src, snk)
+    local chunk, src_err = src()
+    local ret, snk_err = snk(chunk, src_err)
+    if chunk and ret then return 1
+    else return nil, src_err or snk_err end
+end
+
+function pump.all(src, snk, step)
+    base.assert(src and snk)
+    step = step or pump.step
+    while true do
+        local ret, err = step(src, snk)
+        if not ret then
+            if err then return nil, err
+            else return 1 end
+        end
+    end
+end
+