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require 'spec_helper'
describe StructFu, "mixin methods" do
before :each do
class StructClass
include StructFu
end
@sc = StructClass.new
end
it "should provide the basic StructFu methods" do
expect(@sc).to respond_to(:sz)
expect(@sc).to respond_to(:len)
expect(@sc).to respond_to(:typecast)
expect(@sc).to respond_to(:body=)
end
end
describe StructFu::Int, "basic Int class" do
before :each do
@int = StructFu::Int.new(8)
end
it "should have an initial state" do
new_int = StructFu::Int.new
expect(new_int.value).to be_nil
expect(new_int.endian).to be_nil
expect(new_int.width).to be_nil
expect(new_int.default).to eql(0)
end
it "should raise when to_s'ed directly" do
expect{ @int.to_s}.to raise_error(StandardError, "StructFu::Int#to_s accessed, must be redefined.")
end
it "should have a value of 8" do
expect(@int.value).to eql(8)
expect(@int.to_i).to eql(8)
expect(@int.to_f.to_s).to eql("8.0")
end
it "should read an integer" do
@int.read(7)
expect(@int.to_i).to eql(7)
end
end
describe StructFu::Int8, "one byte value" do
before :each do
@int = StructFu::Int8.new(11)
end
it "should have an initial state" do
new_int = StructFu::Int8.new
expect(new_int.value).to be_nil
expect(new_int.endian).to be_nil
expect(new_int.width).to eql(1)
expect(new_int.default).to eql(0)
end
it "should print a one character packed string" do
expect(@int.to_s).to eql("\x0b")
end
it "should have a value of 11" do
expect(@int.value).to eql(11)
expect(@int.to_i).to eql(11)
expect(@int.to_f.to_s).to eql("11.0")
end
it "should reset with a new integer" do
@int.read(2)
expect(@int.to_i).to eql(2)
expect(@int.to_s).to eql("\x02")
@int.read(254)
expect(@int.to_i).to eql(254)
expect(@int.to_s).to eql("\xfe".force_encoding("binary"))
end
end
describe StructFu::Int16, "two byte value" do
before :each do
@int = StructFu::Int16.new(11)
end
it "should have an initial state" do
new_int = StructFu::Int16.new
expect(new_int.value).to be_nil
expect(new_int.endian).to eql(:big)
expect(new_int.width).to eql(2)
expect(new_int.default).to eql(0)
end
it "should print a two character packed string" do
expect(@int.to_s).to eql("\x00\x0b".force_encoding("binary"))
end
it "should have a value of 11" do
expect(@int.value).to eql(11)
expect(@int.to_i).to eql(11)
expect(@int.to_f.to_s).to eql("11.0")
end
it "should reset with a new integer" do
@int.read(2)
expect(@int.to_i).to eql(2)
expect(@int.to_s).to eql("\x00\x02")
@int.read(254)
expect(@int.to_i).to eql(254)
expect(@int.to_s).to eql("\x00\xfe".force_encoding("binary"))
end
it "should be able to set endianness" do
int_be = StructFu::Int16.new(11,:big)
expect(int_be.to_s).to eql("\x00\x0b")
int_le = StructFu::Int16.new(11,:little)
expect(int_le.to_s).to eql("\x0b\x00")
end
it "should be able to switch endianness" do
@int.endian.should == :big
expect(@int.to_s).to eql("\x00\x0b")
@int.endian = :little
expect(@int.endian).to eql(:little)
@int.read(11)
expect(@int.to_s).to eql("\x0b\x00")
end
end
describe StructFu::Int16le, "2 byte little-endian value" do
before :each do
@int = StructFu::Int16le.new(11)
end
it "should behave pretty much like any other 16 bit int" do
expect(@int.to_s).to eql("\x0b\x00")
end
it "should raise when you try to change endianness" do
expect { @int.endian = :big }.to raise_error(NoMethodError, /undefined method `endian='/)
expect { @int.endian = :little }.to raise_error(NoMethodError, /undefined method `endian='/)
end
end
describe StructFu::Int16be, "2 byte big-endian value" do
before :each do
@int = StructFu::Int16be.new(11)
end
it "should behave pretty much like any other 16 bit int" do
expect(@int.to_s).to eql("\x00\x0b")
end
it "should raise when you try to change endianness" do
expect { @int.endian = :big }.to raise_error(NoMethodError, /undefined method `endian='/)
expect { @int.endian = :little }.to raise_error(NoMethodError, /undefined method `endian='/)
end
end
describe StructFu::Int32, "four byte value" do
before :each do
@int = StructFu::Int32.new(11)
end
it "should have an initial state" do
new_int = StructFu::Int32.new
expect(new_int.value).to be_nil
expect(new_int.endian).to eql(:big)
expect(new_int.width).to eql(4)
expect(new_int.default).to eql(0)
end
it "should print a four character packed string" do
expect(@int.to_s).to eql("\x00\x00\x00\x0b")
end
it "should have a value of 11" do
expect(@int.value).to eql(11)
expect(@int.to_i).to eql(11)
expect(@int.to_f.to_s).to eql("11.0")
end
it "should reset with a new integer" do
@int.read(2)
expect(@int.to_i).to eql(2)
expect(@int.to_s).to eql("\x00\x00\x00\x02")
@int.read(254)
expect(@int.to_i).to eql(254)
expect(@int.to_s).to eql("\x00\x00\x00\xfe".force_encoding("binary"))
end
it "should be able to set endianness" do
int_be = StructFu::Int32.new(11,:big)
expect(int_be.to_s).to eql("\x00\x00\x00\x0b")
int_le = StructFu::Int32.new(11,:little)
expect(int_le.to_s).to eql("\x0b\x00\x00\x00")
end
it "should be able to switch endianness" do
@int.endian.should == :big
expect(@int.to_s).to eql("\x00\x00\x00\x0b")
@int.endian = :little
expect(@int.endian).to eql(:little)
@int.read(11)
expect(@int.to_s).to eql("\x0b\x00\x00\x00")
end
end
describe StructFu::Int32le, "4 byte little-endian value" do
before :each do
@int = StructFu::Int32le.new(11)
end
it "should behave pretty much like any other 32 bit int" do
expect(@int.to_s).to eql("\x0b\x00\x00\x00")
end
it "should raise when you try to change endianness" do
expect { @int.endian = :big }.to raise_error(NoMethodError, /undefined method `endian='/)
expect { @int.endian = :little }.to raise_error(NoMethodError, /undefined method `endian='/)
end
end
describe StructFu::Int32be, "4 byte big-endian value" do
before :each do
@int = StructFu::Int32be.new(11)
end
it "should behave pretty much like any other 32 bit int" do
expect(@int.to_s).to eql("\x00\x00\x00\x0b")
end
it "should raise when you try to change endianness" do
expect { @int.endian = :big }.to raise_error(NoMethodError, /undefined method `endian='/)
expect { @int.endian = :little }.to raise_error(NoMethodError, /undefined method `endian='/)
end
end
describe StructFu::String, "a sligtly more special String" do
before :each do
@str = StructFu::String.new("Oi, a string")
end
it "should behave pretty much like a string" do
expect(@str).to be_kind_of(String)
end
it "should have a read method" do
expect(@str).to respond_to(:read)
end
it "should read data like other StructFu things" do
@str.read("hello")
expect(@str).to eql("hello")
end
end
describe StructFu::IntString do
it "should be" do
StructFu::IntString.should be
end
it "should have a length and value" do
istr = StructFu::IntString.new("Avast!")
expect(istr.to_s).to eql("\x06Avast!")
end
it "should have a 16-bit length and a value" do
istr = StructFu::IntString.new("Avast!",StructFu::Int16)
expect(istr.to_s).to eql("\x00\x06Avast!")
end
it "should have a 32-bit length and a value" do
istr = StructFu::IntString.new("Avast!",StructFu::Int32)
expect(istr.to_s).to eql("\x00\x00\x00\x06Avast!")
end
before :each do
@istr = StructFu::IntString.new("Avast!",StructFu::Int32)
end
it "should report the correct length with a new string" do
expect(@istr.to_s).to eql("\x00\x00\x00\x06Avast!")
@istr.string = "Ahoy!"
expect(@istr.to_s).to eql("\x00\x00\x00\x05Ahoy!")
end
it "should report the correct length with a new string" do
@istr.string = "Ahoy!"
expect(@istr.to_s).to eql("\x00\x00\x00\x05Ahoy!")
end
it "should keep the old length with a new string" do
@istr[:string] = "Ahoy!"
expect(@istr.to_s).to eql("\x00\x00\x00\x06Ahoy!")
end
it "should allow for adjusting the length manually" do
@istr.len = 16
expect(@istr.to_s).to eql("\x00\x00\x00\x10Avast!")
end
it "should read in an expected string" do
data = "\x00\x00\x00\x09Yo ho ho!"
@istr.read(data)
expect(@istr.to_s).to eql(data)
end
it "should raise when a string is too short" do
data = "\x01A"
expect{ @istr.read(data) }.to raise_error(StandardError, "String is too short for type StructFu::Int32")
end
end
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