package emit import ( "math" "math/big" "testing" "github.com/CityOfZion/neo-go/pkg/util" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" ) // testCases were generated using C# node // https://dotnetfiddle.net/trQ4xt var testCases = []struct { number int64 buf []byte }{ {0, []byte{0}}, {1, []byte{1}}, {-1, []byte{255}}, {2, []byte{2}}, {-2, []byte{254}}, {127, []byte{127}}, {-127, []byte{129}}, {128, []byte{128, 0}}, {-128, []byte{128}}, {129, []byte{129, 0}}, {-129, []byte{127, 255}}, {255, []byte{255, 0}}, {-255, []byte{1, 255}}, {256, []byte{0, 1}}, {-256, []byte{0, 255}}, {123456789, []byte{21, 205, 91, 7}}, {-123456789, []byte{235, 50, 164, 248}}, {-6777216, []byte{128, 150, 152}}, // tx c8ba2ce29e07447639b9b658db3930c4cce617652d325e78b768ee9d4dbd72b8 {6777216, []byte{128, 105, 103}}, {32639, []byte{127, 127}}, {-32641, []byte{127, 128}}, {8355711, []byte{127, 127, 127}}, {-8355969, []byte{127, 127, 128}}, {2139062143, []byte{127, 127, 127, 127}}, {-2139127937, []byte{127, 127, 127, 128}}, {547599908735, []byte{127, 127, 127, 127, 127}}, {-547616751745, []byte{127, 127, 127, 127, 128}}, {140185576636287, []byte{127, 127, 127, 127, 127, 127}}, {-140189888446593, []byte{127, 127, 127, 127, 127, 128}}, {35887507618889599, []byte{127, 127, 127, 127, 127, 127, 127}}, {-35888611442327681, []byte{127, 127, 127, 127, 127, 127, 128}}, {9187201950435737471, []byte{127, 127, 127, 127, 127, 127, 127, 127}}, {-9187484529235886209, []byte{127, 127, 127, 127, 127, 127, 127, 128}}, // https://github.com/dotnet/runtime/blob/master/src/libraries/System.Runtime.Numerics/tests/BigInteger/ToByteArray.cs#L14 {0, []byte{0x00}}, {3, []byte{0x03}}, {128, []byte{0x80, 0x00}}, {200, []byte{0xc8, 0x00}}, {256, []byte{0x00, 0x01}}, {2005, []byte{0xd5, 0x07}}, {10197, []byte{0xd5, 0x27}}, {33023, []byte{0xff, 0x80, 0x00}}, {2368349, []byte{0x5d, 0x23, 0x24}}, {10756957, []byte{0x5d, 0x23, 0xa4, 0x00}}, {193100307, []byte{0x13, 0x7a, 0x82, 0x0b}}, {1266842131, []byte{0x13, 0x7a, 0x82, 0x4b}}, {math.MaxInt32, []byte{0xff, 0xff, 0xff, 0x7f}}, {-1, []byte{0xff}}, {-128, []byte{0x80}}, {-172, []byte{0x54, 0xff}}, {-23439, []byte{0x71, 0xa4}}, {-51301, []byte{0x9b, 0x37, 0xff}}, {-126341, []byte{0x7b, 0x12, 0xfe}}, {-13194515, []byte{0xed, 0xaa, 0x36, 0xff}}, {-2068145902, []byte{0x12, 0x99, 0xba, 0x84}}, {math.MinInt32, []byte{0x00, 0x00, 0x00, 0x80}}, // https://github.com/dotnet/runtime/blob/master/src/libraries/System.Runtime.Numerics/tests/BigInteger/ToByteArray.cs#L53 {0x100112233, []byte{0x33, 0x22, 0x11, 0x00, 0x01}}, {0x300112233, []byte{0x33, 0x22, 0x11, 0x00, 0x03}}, {0x8000112233, []byte{0x33, 0x22, 0x11, 0x00, 0x80, 0x00}}, {0x3cd00112233, []byte{0x33, 0x22, 0x11, 0x00, 0xcd, 0x03}}, {0xf92100112233, []byte{0x33, 0x22, 0x11, 0x00, 0x21, 0xf9, 0x00}}, {0x749aa00112233, []byte{0x33, 0x22, 0x11, 0x00, 0xaa, 0x49, 0x07}}, {0x80112200112233, []byte{0x33, 0x22, 0x11, 0x00, 0x22, 0x11, 0x80, 0x00}}, {0x7654321000112233, []byte{0x33, 0x22, 0x11, 0x00, 0x10, 0x32, 0x54, 0x76}}, {math.MaxInt64, []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f}}, {-0x100112233, []byte{0xcd, 0xdd, 0xee, 0xff, 0xfe}}, {-0x8000112233, []byte{0xcd, 0xdd, 0xee, 0xff, 0x7f, 0xff}}, {-0x3cd00112233, []byte{0xcd, 0xdd, 0xee, 0xff, 0x32, 0xfc}}, {-0xf92100112233, []byte{0xcd, 0xdd, 0xee, 0xff, 0xde, 0x06, 0xff}}, {-0x749aa00112233, []byte{0xcd, 0xdd, 0xee, 0xff, 0x55, 0xb6, 0xf8}}, {-0x80112200112233, []byte{0xcd, 0xdd, 0xee, 0xff, 0xdd, 0xee, 0x7f, 0xff}}, {-0x7654321000112233, []byte{0xcd, 0xdd, 0xee, 0xff, 0xef, 0xcd, 0xab, 0x89}}, {math.MinInt64, []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80}}, {-0x100000000, []byte{0x00, 0x00, 0x00, 0x00, 0xff}}, {-0x300000000, []byte{0x00, 0x00, 0x00, 0x00, 0xfd}}, {-0x8000000000, []byte{0x00, 0x00, 0x00, 0x00, 0x80}}, {-0xfe00000000, []byte{0x00, 0x00, 0x00, 0x00, 0x02, 0xff}}, {-0xff00000000, []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0xff}}, {-0xfeff00000000, []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0xff}}, {-0xffff00000000, []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0xff}}, {-0xfeffff00000000, []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0xff}}, {-0xffffff00000000, []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0xff}}, } func TestIntToBytes(t *testing.T) { for _, tc := range testCases { buf := IntToBytes(big.NewInt(tc.number)) assert.Equal(t, tc.buf, buf, "error while converting %d", tc.number) } } func TestBytesToInt(t *testing.T) { for _, tc := range testCases { num := BytesToInt(tc.buf) assert.Equal(t, tc.number, num.Int64(), "error while converting %d", tc.number) } t.Run("empty array", func(t *testing.T) { require.EqualValues(t, 0, BytesToInt([]byte{}).Int64()) }) } func TestEquivalentRepresentations(t *testing.T) { for _, tc := range testCases { buf := tc.buf if tc.number >= 0 { buf = append(buf, 0, 0, 0) } else { buf = append(buf, 0xFF, 0xFF, 0xFF) } num := BytesToInt(buf) assert.Equal(t, tc.number, num.Int64(), "error while converting %d", tc.number) } } var stringCases = []struct { numStr string buf []byte }{ {"-1256271214286163627607479687759920896", []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 255}}, {"168884912246183068104079824028124185087", []byte{255, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 127}}, {"1402184777283668118200134432800768511", []byte{255, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 1}}, {"-43536131589161850832973096317989605473920", []byte{128, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 128}}, {"43235871975677457350187428577111288447360", []byte{128, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 127}}, } // this cases are from stdlib // https://github.com/dotnet/runtime/blob/master/src/libraries/System.Runtime.Numerics/tests/BigInteger/ToByteArray.cs#L96 // note that they are in big-endian var stdlibCases = []struct { numStr string buf []byte }{ {"0", []byte{0}}, {"127", []byte{0x7F}}, {"128", []byte{0x00, 0x80}}, {"33022", []byte{0x00, 0x80, 0xFE}}, {"-32514", []byte{0x80, 0xFE}}, {"-18374686475376656384", []byte{0xff, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00}}, {"-18446744069414584320", []byte{0xff, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00}}, {"12364093636075302621581796971036731159910277399901099375861080574506898189967563102391591201943540153492149033597384108294298661111799425262742266671957323486506857011293831406641316917374615487590434666756862524718179898130435474398176187353530443750986128762955255137790631223519091107256083370837751230886741470719554141609004126665185940207631783192780186624919167901565253877397154522582982120840364212333366972597473045167409184762879376102731157263235904816835054250885637739932914015117504485702897712016943555929710070193511128651378003670520306509417025958556935067307123832592173743652726898616663215056178200135054604939862749863002480827458494339065850786495122398411385446068167146399066035389699059499954747263948595492570959736940353095030589033792026029085438901525807032848103038290802923997216273712349905230080849822000411239032166420681788646737098078876258256753058713515144604794792139863186822520361187685685356628044518258989638970651859178568755065879235553215218267011024902142765549091793970027321040036512883269922219608216030987714165823965404563131018846411947569009598716649463301689241563037584803938711917477764863093448004918315253652379776337794243677630540042379049027", 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0xfa, 0x28, 0x80}}, } func TestVeryBigInts(t *testing.T) { for _, tc := range stringCases { num, ok := new(big.Int).SetString(tc.numStr, 10) assert.True(t, ok) result := BytesToInt(tc.buf) assert.Equal(t, num, result, "error while converting %s from bytes", tc.numStr) assert.Equal(t, tc.buf, IntToBytes(result), "error while converting %s to bytes", tc.numStr) } for _, tc := range stdlibCases { num, ok := new(big.Int).SetString(tc.numStr, 10) assert.True(t, ok) result := BytesToInt(util.ArrayReverse(tc.buf)) assert.Equal(t, num, result, "error while converting %s from bytes", tc.numStr) } }