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pack.c: add an offset argument to unpack and unpack1

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[Feature #18254]

This is useful to avoid repeteadly copying strings when parsing binary formats
This commit is contained in:
Jean Boussier 2021-10-18 16:23:54 +02:00
parent 717ab0bb2e
commit e5319dc985
5 changed files with 103 additions and 13 deletions
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20
spec/ruby/core/string/unpack1_spec.rb
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@ -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