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require "spec"
private def assert_bytes(io, *bytes)
io.rewind
bytes.each do |byte|
io.read_byte.should eq(byte)
end
io.read_byte.should be_nil
end
private def assert_bytes_reversed(io, *bytes)
assert_bytes io, *bytes.reverse
end
private def new_string_io(*bytes)
io = IO::Memory.new
bytes.each { |byte| io.write_byte byte.to_u8 }
io.rewind
io
end
describe IO::ByteFormat do
describe "little endian" do
describe "encode" do
describe "to io" do
it "writes int8" do
io = IO::Memory.new
io.write_bytes 0x12_i8, IO::ByteFormat::LittleEndian
assert_bytes io, 0x12
end
it "writes int16" do
io = IO::Memory.new
io.write_bytes 0x1234_i16, IO::ByteFormat::LittleEndian
assert_bytes io, 0x34, 0x12
end
it "writes uint16" do
io = IO::Memory.new
io.write_bytes 0x1234_u16, IO::ByteFormat::LittleEndian
assert_bytes io, 0x34, 0x12
end
it "writes int32" do
io = IO::Memory.new
io.write_bytes 0x12345678_i32, IO::ByteFormat::LittleEndian
assert_bytes io, 0x78, 0x56, 0x34, 0x12
end
it "writes int64" do
io = IO::Memory.new
io.write_bytes 0x123456789ABCDEF0_i64, IO::ByteFormat::LittleEndian
assert_bytes io, 0xF0, 0xDE, 0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12
end
it "writes float32" do
io = IO::Memory.new
io.write_bytes 1.234_f32, IO::ByteFormat::LittleEndian
assert_bytes io, 0xB6, 0xF3, 0x9D, 0x3F
end
it "writes float64" do
io = IO::Memory.new
io.write_bytes 1.234, IO::ByteFormat::LittleEndian
assert_bytes io, 0x58, 0x39, 0xB4, 0xC8, 0x76, 0xBE, 0xF3, 0x3F
end
end
describe "to slice" do
it "writes int8" do
bytes = Bytes[0]
IO::ByteFormat::LittleEndian.encode(0x12_i8, bytes)
bytes.should eq(Bytes[0x12_i8])
end
it "writes int16" do
bytes = Bytes[0, 0]
IO::ByteFormat::LittleEndian.encode(0x1234_i16, bytes)
bytes.should eq(Bytes[0x34, 0x12])
end
it "writes int16 to larger slice" do
bytes = Bytes[0, 0, 0, 0]
IO::ByteFormat::LittleEndian.encode(0x1234_i16, bytes)
bytes.should eq(Bytes[0x34, 0x12, 0, 0])
end
end
end
describe "decode" do
describe "from io" do
it "reads int8" do
io = new_string_io(0x12)
int = io.read_bytes Int8, IO::ByteFormat::LittleEndian
int.should eq(0x12_i8)
end
it "reads int16" do
io = new_string_io(0x34, 0x12)
int = io.read_bytes Int16, IO::ByteFormat::LittleEndian
int.should eq(0x1234_i16)
end
it "reads unt16" do
io = new_string_io(0x34, 0x12)
int = io.read_bytes UInt16, IO::ByteFormat::LittleEndian
int.should eq(0x1234_u16)
end
it "reads int32" do
io = new_string_io(0x78, 0x56, 0x34, 0x12)
int = io.read_bytes Int32, IO::ByteFormat::LittleEndian
int.should eq(0x12345678_i32)
end
it "reads int64" do
io = new_string_io(0xF0, 0xDE, 0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12)
int = io.read_bytes Int64, IO::ByteFormat::LittleEndian
int.should eq(0x123456789ABCDEF0_i64)
end
it "reads float32" do
io = new_string_io(0xB6, 0xF3, 0x9D, 0x3F)
float = io.read_bytes Float32, IO::ByteFormat::LittleEndian
float.should be_close(1.234, 0.0001)
end
it "reads float64" do
io = new_string_io(0x58, 0x39, 0xB4, 0xC8, 0x76, 0xBE, 0xF3, 0x3F)
float = io.read_bytes Float64, IO::ByteFormat::LittleEndian
float.should be_close(1.234, 0.0001)
end
end
describe "from slice" do
it "reads int8" do
bytes = Bytes[0x12]
int = IO::ByteFormat::LittleEndian.decode(Int8, bytes)
int.should eq(0x12_i8)
end
it "reads int16" do
bytes = Bytes[0x34, 0x12]
int = IO::ByteFormat::LittleEndian.decode(Int16, bytes)
int.should eq(0x1234_i16)
end
it "reads int16 from larger slice" do
bytes = Bytes[0x34, 0x12, 0, 0]
int = IO::ByteFormat::LittleEndian.decode(Int16, bytes)
int.should eq(0x1234_i16)
end
it "reads float32" do
bytes = Bytes[0xB6, 0xF3, 0x9D, 0x3F]
float = IO::ByteFormat::LittleEndian.decode(Float32, bytes)
float.should be_close(1.234, 0.0001)
end
it "reads float64" do
bytes = Bytes[0x58, 0x39, 0xB4, 0xC8, 0x76, 0xBE, 0xF3, 0x3F]
float = IO::ByteFormat::LittleEndian.decode(Float64, bytes)
float.should be_close(1.234, 0.0001)
end
end
end
end
describe "big endian" do
describe "encode" do
it "writes int8" do
io = IO::Memory.new
io.write_bytes 0x12_i8, IO::ByteFormat::BigEndian
assert_bytes io, 0x12
end
it "writes int16" do
io = IO::Memory.new
io.write_bytes 0x1234_i16, IO::ByteFormat::BigEndian
assert_bytes_reversed io, 0x34, 0x12
end
it "writes int32" do
io = IO::Memory.new
io.write_bytes 0x12345678_i32, IO::ByteFormat::BigEndian
assert_bytes_reversed io, 0x78, 0x56, 0x34, 0x12
end
it "writes int64" do
io = IO::Memory.new
io.write_bytes 0x123456789ABCDEF0_i64, IO::ByteFormat::BigEndian
assert_bytes_reversed io, 0xF0, 0xDE, 0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12
end
it "writes float32" do
io = IO::Memory.new
io.write_bytes 1.234_f32, IO::ByteFormat::BigEndian
assert_bytes_reversed io, 0xB6, 0xF3, 0x9D, 0x3F
end
it "writes float64" do
io = IO::Memory.new
io.write_bytes 1.234, IO::ByteFormat::BigEndian
assert_bytes_reversed io, 0x58, 0x39, 0xB4, 0xC8, 0x76, 0xBE, 0xF3, 0x3F
end
end
describe "decode" do
describe "from io" do
it "reads int8" do
io = new_string_io(0x12)
int = io.read_bytes Int8, IO::ByteFormat::BigEndian
int.should eq(0x12_i8)
end
it "reads int16" do
io = new_string_io(0x12, 0x34)
int = io.read_bytes Int16, IO::ByteFormat::BigEndian
int.should eq(0x1234_i16)
end
it "reads unt16" do
io = new_string_io(0x12, 0x34)
int = io.read_bytes UInt16, IO::ByteFormat::BigEndian
int.should eq(0x1234_u16)
end
it "reads int32" do
io = new_string_io(0x12, 0x34, 0x56, 0x78)
int = io.read_bytes Int32, IO::ByteFormat::BigEndian
int.should eq(0x12345678_i32)
end
it "reads int64" do
io = new_string_io(0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0)
int = io.read_bytes Int64, IO::ByteFormat::BigEndian
int.should eq(0x123456789ABCDEF0_i64)
end
it "reads float32" do
io = new_string_io(0x3F, 0x9D, 0xF3, 0xB6)
float = io.read_bytes Float32, IO::ByteFormat::BigEndian
float.should be_close(1.234, 0.0001)
end
it "reads float64" do
io = new_string_io(0x3F, 0xF3, 0xBE, 0x76, 0xC8, 0xB4, 0x39, 0x58)
float = io.read_bytes Float64, IO::ByteFormat::BigEndian
float.should be_close(1.234, 0.0001)
end
end
describe "from slice" do
it "reads int8" do
bytes = Bytes[0x12]
int = IO::ByteFormat::BigEndian.decode(Int8, bytes)
int.should eq(0x12_i8)
end
it "reads int16" do
bytes = Bytes[0x12, 0x34]
int = IO::ByteFormat::BigEndian.decode(Int16, bytes)
int.should eq(0x1234_i16)
end
it "reads float32" do
bytes = Bytes[0x3F, 0x9D, 0xF3, 0xB6]
float = IO::ByteFormat::BigEndian.decode(Float32, bytes)
float.should be_close(1.234, 0.0001)
end
it "reads float64" do
bytes = Bytes[0x3F, 0xF3, 0xBE, 0x76, 0xC8, 0xB4, 0x39, 0x58]
float = IO::ByteFormat::BigEndian.decode(Float64, bytes)
float.should be_close(1.234, 0.0001)
end
end
end
end
end
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