Land #3767, @jvazquez-r7's specs for Rex::Encoder::XDR

bug/bundler_fix
Jon Hart 2014-10-22 09:22:53 -07:00
commit 7b33ff1363
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GPG Key ID: 2FA9F0A3AFA8E9D3
2 changed files with 282 additions and 2 deletions

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@ -16,8 +16,9 @@ module XDR
end
def XDR.decode_int!(data)
return data.slice!(0..3).unpack('N')[0] if data
data = 0
raise ArgumentError, 'XDR: No Integer data to decode' unless data
raise ArgumentError, "XDR: Too little data to decode (#{data.size})" if data.size < 4
return data.slice!(0..3).unpack('N')[0]
end
def XDR.encode_lchar(char)

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@ -0,0 +1,279 @@
# -*- coding:binary -*-
require 'spec_helper'
require 'rex/encoder/xdr'
describe Rex::Encoder::XDR do
describe ".encode_int" do
subject(:encoded_int) { described_class.encode_int(int) }
let(:int) { 0x41424344 }
it "returns an String" do
is_expected.to be_kind_of(String)
end
it "encodes big endian 32 bit usigned integer" do
is_expected.to eq("\x41\x42\x43\x44")
end
end
describe ".decode_int!" do
subject(:decoded_int) { described_class.decode_int!(data) }
context "when data is nil" do
let(:data) { nil }
it "raises an error" do
expect { decoded_int }.to raise_error(ArgumentError)
end
end
context "when data is empty" do
let(:data) { '' }
it "raises an error" do
expect { decoded_int }.to raise_error(ArgumentError)
end
end
context "when data is 1-4 bytes length" do
let(:data) { "\x41\x42\x43\x44" }
it "unpacks big endian 32bit unsigned int" do
is_expected.to eq(0x41424344)
end
end
context "when data is bigger than 4 bytes" do
let(:data) { "\x41\x42\x43\x44\x45" }
it "unpacks just one big endian 32bit unsigned int" do
is_expected.to eq(0x41424344)
end
end
end
describe ".encode_lchar" do
subject(:encoded_lchar) { described_class.encode_lchar(char) }
context "when char & 0x80 == 0" do
let(:char) { 0x80 }
it "encodes char byte as integer with sign extended" do
is_expected.to eq("\xff\xff\xff\x80")
end
end
context "when char & 0x80 != 0" do
let(:char) { 0x41 }
it "encodes char byte as integer" do
is_expected.to eq("\x00\x00\x00\x41")
end
end
end
describe ".decode_lchar!" do
subject(:decoded_lchar) { described_class.decode_lchar!(data) }
context "when data's length is equal or greater than 4" do
let(:data) { "\x41\x42\x43\x44" }
it "returns char code for last byte" do
is_expected.to eq("D")
end
end
context "when data's length is less than 4" do
let(:data) { "\x41" }
it "raises an error" do
expect { decoded_lchar }.to raise_error(ArgumentError)
end
end
end
describe ".encode_string" do
subject(:encoded_string) { described_class.encode_string(str, max) }
context "when data is bigger than max" do
let(:str) { "ABCDE" }
let(:max) { 4 }
it "raises an error" do
expect { encoded_string }.to raise_error(ArgumentError)
end
end
context "when data is shorter or equal to max" do
let(:str) { "ABCDE" }
let(:max) { 5 }
it "returns an String" do
is_expected.to be_kind_of(String)
end
it "prefix encoded length" do
is_expected.to start_with("\x00\x00\x00\x05")
end
it "returns the encoded string padded with zeros" do
is_expected.to eq("\x00\x00\x00\x05ABCDE\x00\x00\x00")
end
end
end
describe ".decode_string!" do
subject(:decoded_string) { described_class.decode_string!(data) }
context "when encoded string length is 0" do
let(:data) { "\x00\x00\x00\x00" }
it "returns empty string" do
is_expected.to eq("")
end
end
context "when string contains padding" do
let(:data) {"\x00\x00\x00\x03ABC00000"}
it "returns string without padding" do
is_expected.to eq("ABC")
end
end
context "when fake length" do
context "and no string" do
let(:data) { "\x00\x00\x00\x03" }
it "returns empty string" do
is_expected.to eq("")
end
end
context "longer than real string length" do
let(:data) { "\x00\x00\x00\x08ABCD" }
it "returns available string" do
is_expected.to eq("ABCD")
end
end
end
end
describe ".encode_varray" do
subject(:encoded_varray) { described_class.encode_varray(arr, max) }
context "when arr length is bigger than max" do
let(:arr) { [1, 2, 3] }
let(:max) { 2 }
it "raises an error" do
expect { encoded_varray }.to raise_error(ArgumentError)
end
end
context "when arr length is minor or equal than max" do
let(:arr) { [0x41414141, 0x42424242, 0x43434343] }
let(:max) { 3 }
it "returns an String" do
expect(described_class.encode_varray(arr, max) { |i| described_class.encode_int(i) }).to be_kind_of(String)
end
it "prefixes encoded length" do
expect(described_class.encode_varray(arr, max) { |i| described_class.encode_int(i) }).to start_with("\x00\x00\x00\x03")
end
it "returns the encoded array" do
expect(described_class.encode_varray(arr, max) { |i| described_class.encode_int(i) }).to eq("\x00\x00\x00\x03\x41\x41\x41\x41\x42\x42\x42\x42\x43\x43\x43\x43")
end
end
end
describe ".decode_varray!" do
subject(:decoded_varray) { described_class.decode_varray!(data) }
context "when encoded length is 0" do
let(:data) { "\x00\x00\x00\x00" }
it "returns an empty array" do
is_expected.to eq([])
end
end
context "when fake encoded length" do
context "and no values" do
let(:data) { "\x00\x00\x00\x02" }
it "raises an error" do
expect { described_class.decode_varray!(data) { |s| described_class.decode_int!(s) } }.to raise_error(ArgumentError)
end
end
context "longer than available values" do
let(:data) { "\x00\x00\x00\x02\x00\x00\x00\x41" }
it "raises an error" do
expect { described_class.decode_varray!(data) { |s| described_class.decode_int!(s) } }.to raise_error(ArgumentError)
end
end
end
context "when valid encoded data" do
let(:data) { "\x00\x00\x00\x02\x41\x42\x43\x44\x00\x00\x00\x11"}
it "retuns Array with decoded values" do
expect(described_class.decode_varray!(data) { |s| described_class.decode_int!(s) }).to eq([0x41424344, 0x11])
end
end
end
describe ".encode" do
it "encodes integers" do
expect(described_class.encode(1)).to eq("\x00\x00\x00\x01")
end
it "encodes arrays" do
expect(described_class.encode([0x41414141, 0x42424242])).to eq("\x00\x00\x00\x02\x41\x41\x41\x41\x42\x42\x42\x42")
end
it "encodes strings" do
expect(described_class.encode("ABCD")).to eq("\x00\x00\x00\x04\x41\x42\x43\x44")
end
it "encodes mixed type of elements" do
expect(described_class.encode(1, [0x41414141], "ABCD")).to eq("\x00\x00\x00\x01\x00\x00\x00\x01\x41\x41\x41\x41\x00\x00\x00\x04\x41\x42\x43\x44")
end
end
describe ".decode!" do
context "when no type arguments" do
it "retuns empty Array" do
expect(described_class.decode!("\x41\x41\x41\x41")).to eq([])
end
end
context "when not enough data" do
it "retuns Array filled with nils" do
expect(described_class.decode!("", Array)).to eq([nil])
end
end
it "decodes integers" do
expect(described_class.decode!("\x41\x41\x41\x41", Integer)).to eq([0x41414141])
end
it "decodes arrays" do
expect(described_class.decode!("\x00\x00\x00\x01\x41\x41\x41\x41", [Integer])).to eq([[0x41414141]])
end
it "decodes strings" do
expect(described_class.decode!("\x00\x00\x00\x01\x41", String)).to eq(["A"])
end
it "decodes mixed elements" do
expect(described_class.decode!("\x41\x41\x41\x41\x00\x00\x00\x01\x41\x00\x00\x00\x00\x00\x00\x01\x42\x42\x42\x42", Integer, String, [Integer])).to eq([0x41414141, "A", [0x42424242]])
end
end
end