From e5319dc9856298f38aa9cdc6ed55e39ad0e8e070 Mon Sep 17 00:00:00 2001 From: Jean Boussier Date: Mon, 18 Oct 2021 16:23:54 +0200 Subject: pack.c: add an offset argument to unpack and unpack1 [Feature #18254] This is useful to avoid repeteadly copying strings when parsing binary formats --- spec/ruby/core/string/unpack1_spec.rb | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'spec/ruby/core/string/unpack1_spec.rb') diff --git a/spec/ruby/core/string/unpack1_spec.rb b/spec/ruby/core/string/unpack1_spec.rb index 5fe81733fb..f59bd92d6a 100644 --- a/spec/ruby/core/string/unpack1_spec.rb +++ b/spec/ruby/core/string/unpack1_spec.rb @@ -7,4 +7,24 @@ describe "String#unpack1" do "aG9nZWZ1Z2E=".unpack1("m").should == "hogefuga" "A".unpack1("B*").should == "01000001" end + + ruby_version_is "3.1" do + it "starts unpacking from the given offset" do + "ZZABCD".unpack1('x3C', offset: 2).should == "ABCD".unpack('x3C')[0] + "ZZZZaG9nZWZ1Z2E=".unpack1("m", offset: 4).should == "hogefuga" + "ZA".unpack1("B*", offset: 1).should == "01000001" + end + + it "raises an ArgumentError when the offset is negative" do + -> { "a".unpack1("C", offset: -1) }.should raise_error(ArgumentError) + end + + it "returns nil if the offset is at the end of the string" do + "a".unpack1("C", offset: 1).should == nil + end + + it "raises an ArgumentError when the offset is larget than the string" do + -> { "a".unpack1("C", offset: 2) }.should raise_error(ArgumentError) + end + end end -- cgit v1.2.3