X-Git-Url: https://git.madduck.net/etc/awesome.git/blobdiff_plain/e5c87b4489b0881b7b9903733478f0d11ac96ab7..1f8c95ba28a59bf8459a15c8b2d52234e577e191:/luatz/tzfile.lua

diff --git a/luatz/tzfile.lua b/luatz/tzfile.lua
index eed426e..a3fa794 100644
--- a/luatz/tzfile.lua
+++ b/luatz/tzfile.lua
@@ -1,4 +1,6 @@
 local tz_info_mt = require "luatz.tzinfo".tz_info_mt
+local tt_info_mt = require "luatz.tzinfo".tt_info_mt
+
 
 local function read_int32be ( fd )
 	local data , err = fd:read ( 4 )
@@ -39,7 +41,7 @@ end
 
 local fifteen_nulls = ("\0"):rep(15)
 local function read_tz ( fd )
-	assert ( fd:read(4) == "TZif" )
+	assert ( fd:read(4) == "TZif" , "Invalid TZ file" )
 	local version = assert ( fd:read(1) )
 	if version == "\0" or version == "2" then
 		local MIN_TIME = -2^32+1
@@ -93,7 +95,9 @@ local function read_tz ( fd )
 
 		local isgmt = assert ( read_flags ( fd , tzh_ttisgmtcnt ) )
 
-		if version == "2" then
+		local TZ
+
+		if version == "2" or version == "3" then
 			--[[
 			For version-2-format timezone files, the above header and data is followed by a second header and data,
 			identical in format except that eight bytes are used for each transition time or leap-second time.
@@ -155,6 +159,23 @@ local function read_tz ( fd )
 			for use in handling instants after the last transition time stored in the file
 			(with nothing between the newlines if there is no POSIX representation for such instants).
 			]]
+
+			--[[
+			For version-3-format time zone files, the POSIX-TZ-style string may
+			use two minor extensions to the POSIX TZ format, as described in newtzset (3).
+			First, the hours part of its transition times may be signed and range from
+			-167 through 167 instead of the POSIX-required unsigned values
+			from 0 through 24.  Second, DST is in effect all year if it starts
+			January 1 at 00:00 and ends December 31 at 24:00 plus the difference
+			between daylight saving and standard time.
+			]]
+
+			assert ( assert ( fd:read ( 1 ) ) == "\n" , "Expected newline at end of version 2 header" )
+
+			TZ = assert ( fd:read ( "*l" ) )
+			if #TZ == 0 then
+				TZ = nil
+			end
 		end
 
 		for i=1, tzh_typecnt do
@@ -162,6 +183,7 @@ local function read_tz ( fd )
 			v.abbr = abbreviations:sub ( v.abbrind+1 , v.abbrind+3 )
 			v.isstd = isstd [ i ] or false
 			v.isgmt = isgmt [ i ] or false
+			setmetatable ( v , tt_info_mt )
 		end
 
 		--[[
@@ -198,7 +220,7 @@ local function read_tz ( fd )
 end
 
 local function read_tzfile ( path )
-	local fd = assert ( io.open ( path ) )
+	local fd = assert ( io.open ( path , "rb" ) )
 	local tzinfo = read_tz ( fd )
 	fd:close ( )
 	return tzinfo