luatz/tzfile: Fix support for version 3 files

Relevant to #2
Fixes #7

diff --git a/luatz/tzfile.lua b/luatz/tzfile.lua
index d4285c4b2b73bfdad4448dc2474f71d1897f021b..4fddddf603082e47ecc21d99563fe3152bc51e45 100644 (file)
--- a/luatz/tzfile.lua
+++ b/luatz/tzfile.lua
@@ -58,7 +58,7 @@ local fifteen_nulls = ("\0"):rep(15)
 local function read_tz ( fd )
        assert ( fd:read(4) == "TZif" , "Invalid TZ file" )
        local version = assert ( fd:read(1) )
-       if version == "\0" or version == "2" then
+       if version == "\0" or version == "2" or version == "3" then
                local MIN_TIME = -2^32+1
 
                assert ( assert ( fd:read(15) ) == fifteen_nulls , "Expected 15 nulls" )
@@ -117,7 +117,8 @@ local function read_tz ( fd )
                        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.
                        ]]
-                       assert ( fd:read(5) == "TZif2" )
+                       assert(fd:read(4) == "TZif")
+                       assert(fd:read(1) == version)
                        assert ( assert ( fd:read(15) ) == fifteen_nulls , "Expected 15 nulls" )
 
                        MIN_TIME = -2^64+1