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# -*- encoding: binary -*-
require_relative '../../../spec_helper'
require_relative '../fixtures/classes'
require_relative 'shared/basic'
require_relative 'shared/taint'
describe "String#unpack with format 'H'" do
it_behaves_like :string_unpack_basic, 'H'
it_behaves_like :string_unpack_no_platform, 'H'
it_behaves_like :string_unpack_taint, 'H'
it "decodes one nibble from each byte for each format character starting with the most significant bit" do
[ ["\x8f", "H", ["8"]],
["\xf8\x0f", "HH", ["f", "0"]]
].should be_computed_by(:unpack)
end
it "decodes only the number of nibbles in the string when passed a count" do
"\xca\xfe".unpack("H5").should == ["cafe"]
end
it "decodes multiple differing nibble counts from a single string" do
array = "\xaa\x55\xaa\xd4\xc3\x6b\xd7\xaa\xd7".unpack("HH2H3H4H5")
array.should == ["a", "55", "aad", "c36b", "d7aad"]
end
it "decodes a directive with a '*' modifier after a directive with a count modifier" do
"\xaa\x55\xaa\xd4\xc3\x6b".unpack("H3H*").should == ["aa5", "aad4c36b"]
end
it "decodes a directive with a count modifier after a directive with a '*' modifier" do
"\xaa\x55\xaa\xd4\xc3\x6b".unpack("H*H3").should == ["aa55aad4c36b", ""]
end
it "decodes the number of nibbles specified by the count modifier" do
[ ["\xab", "H0", [""]],
["\x00", "H1", ["0"]],
["\x01", "H2", ["01"]],
["\x01\x23", "H3", ["012"]],
["\x01\x23", "H4", ["0123"]],
["\x01\x23\x45", "H5", ["01234"]]
].should be_computed_by(:unpack)
end
it "decodes all the nibbles when passed the '*' modifier" do
[ ["", [""]],
["\xab", ["ab"]],
["\xca\xfe", ["cafe"]],
].should be_computed_by(:unpack, "H*")
end
it "adds an empty string for each element requested beyond the end of the String" do
[ ["", ["", "", ""]],
["\x01", ["0", "", ""]],
["\x01\x80", ["0", "8", ""]]
].should be_computed_by(:unpack, "HHH")
end
it "ignores NULL bytes between directives" do
"\x01\x10".unpack("H\x00H").should == ["0", "1"]
end
it "ignores spaces between directives" do
"\x01\x10".unpack("H H").should == ["0", "1"]
end
it "should make strings with US_ASCII encoding" do
"\x01".unpack("H")[0].encoding.should == Encoding::US_ASCII
end
end
describe "String#unpack with format 'h'" do
it_behaves_like :string_unpack_basic, 'h'
it_behaves_like :string_unpack_no_platform, 'h'
it_behaves_like :string_unpack_taint, 'h'
it "decodes one nibble from each byte for each format character starting with the least significant bit" do
[ ["\x8f", "h", ["f"]],
["\xf8\x0f", "hh", ["8", "f"]]
].should be_computed_by(:unpack)
end
it "decodes only the number of nibbles in the string when passed a count" do
"\xac\xef".unpack("h5").should == ["cafe"]
end
it "decodes multiple differing nibble counts from a single string" do
array = "\xaa\x55\xaa\xd4\xc3\x6b\xd7\xaa\xd7".unpack("hh2h3h4h5")
array.should == ["a", "55", "aa4", "3cb6", "7daa7"]
end
it "decodes a directive with a '*' modifier after a directive with a count modifier" do
"\xba\x55\xaa\xd4\xc3\x6b".unpack("h3h*").should == ["ab5", "aa4d3cb6"]
end
it "decodes a directive with a count modifier after a directive with a '*' modifier" do
"\xba\x55\xaa\xd4\xc3\x6b".unpack("h*h3").should == ["ab55aa4d3cb6", ""]
end
it "decodes the number of nibbles specified by the count modifier" do
[ ["\xab", "h0", [""]],
["\x00", "h1", ["0"]],
["\x01", "h2", ["10"]],
["\x01\x23", "h3", ["103"]],
["\x01\x23", "h4", ["1032"]],
["\x01\x23\x45", "h5", ["10325"]]
].should be_computed_by(:unpack)
end
it "decodes all the nibbles when passed the '*' modifier" do
[ ["", [""]],
["\xab", ["ba"]],
["\xac\xef", ["cafe"]],
].should be_computed_by(:unpack, "h*")
end
it "adds an empty string for each element requested beyond the end of the String" do
[ ["", ["", "", ""]],
["\x01", ["1", "", ""]],
["\x01\x80", ["1", "0", ""]]
].should be_computed_by(:unpack, "hhh")
end
it "ignores NULL bytes between directives" do
"\x01\x10".unpack("h\x00h").should == ["1", "0"]
end
it "ignores spaces between directives" do
"\x01\x10".unpack("h h").should == ["1", "0"]
end
it "should make strings with US_ASCII encoding" do
"\x01".unpack("h")[0].encoding.should == Encoding::US_ASCII
end
end
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