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Single byte negative int unpacks wrong

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ChillerDragon 2022-11-06 13:57:53 +01:00
parent 0479e7f07e
commit 01d8f8d8e6
3 changed files with 36 additions and 0 deletions
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4
lib/packer.rb
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@ -130,3 +130,7 @@ class Unpacker
bits.join.to_i(2) * sign
end
end
u = Unpacker.new(['01000000'.to_i(2)])
# expect -1
p u.get_int

11
spec/04_packer_spec.rb
View file

@ -28,6 +28,17 @@ describe 'Packer', :packer do
expect(Packer.pack_int(-3).first.to_s(2)).to eq('1000010')
expect(Packer.pack_int(-4).first.to_s(2)).to eq('1000011')
end
# https://github.com/ddnet/ddnet/pull/6015
it 'Should pack the same as ddnet C++ tests -3..3' do
expect(Packer.pack_int(1).first.to_s(2).rjust(8, '0')).to eq('00000001')
expect(Packer.pack_int(2).first.to_s(2).rjust(8, '0')).to eq('00000010')
expect(Packer.pack_int(3).first.to_s(2).rjust(8, '0')).to eq('00000011')
expect(Packer.pack_int(-1).first.to_s(2).rjust(8, '0')).to eq('01000000')
expect(Packer.pack_int(-2).first.to_s(2).rjust(8, '0')).to eq('01000001')
expect(Packer.pack_int(-3).first.to_s(2).rjust(8, '0')).to eq('01000010')
end
end
context 'Pack multi byte integers' do

21
spec/05_unpacker_spec.rb
View file

@ -40,6 +40,27 @@ describe 'Unpacker', :unpacker do
end
end
# https://github.com/ddnet/ddnet/pull/6015
it 'Should unpack the same as ddnet C++ tests -3..3' do
expect(Packer.pack_int(1).first.to_s(2).rjust(8, '0')).to eq('00000001')
expect(Packer.pack_int(2).first.to_s(2).rjust(8, '0')).to eq('00000010')
expect(Packer.pack_int(3).first.to_s(2).rjust(8, '0')).to eq('00000011')
expect(Packer.pack_int(-1).first.to_s(2).rjust(8, '0')).to eq('01000000')
expect(Packer.pack_int(-2).first.to_s(2).rjust(8, '0')).to eq('01000001')
expect(Packer.pack_int(-3).first.to_s(2).rjust(8, '0')).to eq('01000010')
u = Unpacker.new(['00000001'.to_i(2)])
expect(u.get_int).to eq(1)
u = Unpacker.new(['00000010'.to_i(2)])
expect(u.get_int).to eq(2)
u = Unpacker.new(['00000011'.to_i(2)])
expect(u.get_int).to eq(3)
# u = Unpacker.new(['01000000'.to_i(2)])
# expect(u.get_int).to eq(-1)
end
# it 'Should pack and unpack and match from -3 to 3' do
# (-3..3).each do |i|
# u = Unpacker.new(Packer.pack_int(i))