Error: Bignum too big to convert into `long'
in [Ruby]
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From: Matt Mencel on 9 Aug 2010 18:09 Hi, I've got a bit of code that I borrowed from here http://www.ruby-forum.com/topic/77821. I use it to convert MS timestamps into a ruby Time object. It works fine on Mac/Linux, but not on a Solaris SPARC system. The error is "bignum too big to convert into `long'" and it occurs on the line that begins... Time.at(.....) I'm wondering if it's because SPARC is Big-Endian that I get the error? def self.ad2time(timestamp) ad_epoch = 116_444_736_000_000_000 ad_multiplier = 10_000_000 # DEBUG ap ad_epoch.class puts "TIMESTAMP: #{timestamp}" ap timestamp.class Time.at((timestamp.to_i - ad_epoch) / ad_multiplier) end On my Mac (Snow Leopard x86_64) the DEBUG output looks like this... Fixnum < Integer TIMESTAMP: 9223372036854775807 Net::BER::BerIdentifiedString < String On Solaris SPARC it's this... Bignum < Integer TIMESTAMP: 9223372036854775807 String < Object Looks like on Solaris it forces the 'ad_epoch' to a Bignum instead of a Fixnum? Should I try to cast it to a Fixnum on Solaris maybe? Matt
From: Rob Biedenharn on 9 Aug 2010 23:13 On Aug 9, 2010, at 6:09 PM, Matt Mencel wrote: > Hi, > > I've got a bit of code that I borrowed from here http://www.ruby-forum.com/topic/77821 > . I use it to convert MS timestamps into a ruby Time object. > It works fine on Mac/Linux, but not on a Solaris SPARC system. The > error is "bignum too big to convert into `long'" and it occurs on > the line that begins... > Time.at(.....) > > I'm wondering if it's because SPARC is Big-Endian that I get the > error? > > > def self.ad2time(timestamp) > ad_epoch = 116_444_736_000_000_000 > ad_multiplier = 10_000_000 > > # DEBUG > ap ad_epoch.class > puts "TIMESTAMP: #{timestamp}" > ap timestamp.class > > Time.at((timestamp.to_i - ad_epoch) / ad_multiplier) > end > > > > On my Mac (Snow Leopard x86_64) the DEBUG output looks like this... Ah, note the x86_64 part? That's a 64-bit system so Fixnum holds up to (2^62)-1 > Fixnum < Integer > TIMESTAMP: 9223372036854775807 > Net::BER::BerIdentifiedString < String > > On Solaris SPARC it's this... > Bignum < Integer > TIMESTAMP: 9223372036854775807 > String < Object > > > > Looks like on Solaris it forces the 'ad_epoch' to a Bignum instead > of a Fixnum? Should I try to cast it to a Fixnum on Solaris maybe? > > Matt I suspect your SPARC system is only 32-bit where 2^30 and beyond becomes Bignum. If your timestamp is a Net::BER::BerIdentifiedString, perhaps it has other properties that would help convert it into an Integer. (Notice that both Fixnum and Bignum are subclasses of Integer) On a 32-bit system, the divide between Fixnum and Bignum is: irb> 2**30-1 => 1073741823 irb> _.class => Fixnum irb> 2**30 => 1073741824 irb> _.class => Bignum So 910692730085 is far too big for a Fixnum and Time.at is likely wanting a number of seconds since 1970. Maybe you can see a pattern if you compare Time.now.to_i on your platform with your expected timestamp value. -Rob Rob Biedenharn Rob(a)AgileConsultingLLC.com http://AgileConsultingLLC.com/ rab(a)GaslightSoftware.com http://GaslightSoftware.com/
From: Brian Candler on 10 Aug 2010 08:53 Try your example values in irb: irb(main):003:0> (9223372036854775807 - 116_444_736_000_000_000) / 10_000_000 => 910692730085 irb(main):004:0> Time.at(910692730085) RangeError: bignum too big to convert into `long' from (irb):4:in `at' from (irb):4 Time.at expects number of seconds since Jan 1, 1970. The value you have given it is some time in the year 30,828 :-) I suspect either your epoch or your multiplier is wrong. B. -- Posted via http://www.ruby-forum.com/.
From: Brian Candler on 10 Aug 2010 09:36 Brian Candler wrote: > Time.at expects number of seconds since Jan 1, 1970. > > The value you have given it is some time in the year 30,828 :-) > > I suspect either your epoch or your multiplier is wrong. Actually, I think you're just reading a dummy value. Note the following: irb(main):001:0> 9223372036854775807.to_s(16) => "7fffffffffffffff" (i.e. the largest possible signed 64-bit value) A quick Google suggests the Microsoft epoch is Jan 1, 1601, and Windows uses 100-nanosecond ticks. Using a 64-bit machine: irb(main):002:0> require 'time' => true irb(main):003:0> Time.parse("Jan 1 1601") => Mon Jan 01 00:00:00 -0001 1601 irb(main):004:0> Time.parse("Jan 1 1601").to_i => -11644473525 irb(main):005:0> 11644473525 * 10_000_000 => 116444735250000000 This value agrees with your epoch, within 75 leap seconds anyway. If I use ldapsearch against an AD server, and look at attributes like lastLogon, they give plausible answers when parsed using your function (and succeed on a 32-bit machine) Regards, Brian. -- Posted via http://www.ruby-forum.com/.
From: Matt Mencel on 10 Aug 2010 09:40 Ah... 9223372036854775807 is the timestamp value assigned to the "accountExpires" attribute in Active Directory when any account is set to "Never Expire". It works fine on Linux/Mac but not on Solaris. I guess I'll just convert that timestamp to something like 12/31/2099 23:59:59 before I run the Time.at. Matt ----- Original Message ----- From: "Brian Candler" <b.candler(a)pobox.com> To: "ruby-talk ML" <ruby-talk(a)ruby-lang.org> Sent: Tuesday, August 10, 2010 7:53:24 AM Subject: Re: Error: Bignum too big to convert into `long' Try your example values in irb: irb(main):003:0> (9223372036854775807 - 116_444_736_000_000_000) / 10_000_000 => 910692730085 irb(main):004:0> Time.at(910692730085) RangeError: bignum too big to convert into `long' from (irb):4:in `at' from (irb):4 Time.at expects number of seconds since Jan 1, 1970. The value you have given it is some time in the year 30,828 :-) I suspect either your epoch or your multiplier is wrong. B. -- Posted via http://www.ruby-forum.com/.
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