diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/math/big.go | 8 | ||||
| -rw-r--r-- | common/math/big_test.go | 27 |
2 files changed, 20 insertions, 15 deletions
diff --git a/common/math/big.go b/common/math/big.go index c49d751fa..787278650 100644 --- a/common/math/big.go +++ b/common/math/big.go @@ -131,7 +131,7 @@ func PaddedBigBytes(bigint *big.Int, n int) []byte { } // bigEndianByteAt returns the byte at position n, -// if bigint is considered big-endian. +// in Big-Endian encoding // So n==0 returns the least significant byte func bigEndianByteAt(bigint *big.Int, n int) byte { words := bigint.Bits() @@ -148,9 +148,9 @@ func bigEndianByteAt(bigint *big.Int, n int) byte { } // Byte returns the byte at position n, -// if bigint is considered little-endian with the supplied padlength. -// n==0 returns the most significant byte -// bigint '5', padlength 32, n=31 => 5 +// with the supplied padlength in Little-Endian encoding. +// n==0 returns the MSB +// Example: bigint '5', padlength 32, n=31 => 5 func Byte(bigint *big.Int, padlength, n int) byte { if n >= padlength { return byte(0) diff --git a/common/math/big_test.go b/common/math/big_test.go index 7cce7c212..be9810dc8 100644 --- a/common/math/big_test.go +++ b/common/math/big_test.go @@ -141,6 +141,7 @@ func BenchmarkPaddedBigBytesLargePadding(b *testing.B) { PaddedBigBytes(bigint, 200) } } + func BenchmarkPaddedBigBytesSmallPadding(b *testing.B) { bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC") for i := 0; i < b.N; i++ { @@ -154,18 +155,21 @@ func BenchmarkPaddedBigBytesSmallOnePadding(b *testing.B) { PaddedBigBytes(bigint, 32) } } + func BenchmarkByteAtBrandNew(b *testing.B) { bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC") for i := 0; i < b.N; i++ { bigEndianByteAt(bigint, 15) } } + func BenchmarkByteAt(b *testing.B) { bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC") for i := 0; i < b.N; i++ { bigEndianByteAt(bigint, 15) } } + func BenchmarkByteAtOld(b *testing.B) { bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC") @@ -207,21 +211,22 @@ func TestU256(t *testing.T) { } } } -func TestLittleEndianByteAt(t *testing.T) { +func TestBigEndianByteAt(t *testing.T) { tests := []struct { x string y int exp byte }{ - {"0", 0, 0x00}, - {"1", 1, 0x00}, - {"0", 1, 0x00}, - //{"1", 0, 0x01}, + {"00", 0, 0x00}, + {"01", 1, 0x00}, + {"00", 1, 0x00}, + {"01", 0, 0x01}, {"0000000000000000000000000000000000000000000000000000000000102030", 0, 0x30}, {"0000000000000000000000000000000000000000000000000000000000102030", 1, 0x20}, {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 31, 0xAB}, {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 32, 0x00}, + {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 500, 0x00}, } for _, test := range tests { v := new(big.Int).SetBytes(common.Hex2Bytes(test.x)) @@ -232,17 +237,16 @@ func TestLittleEndianByteAt(t *testing.T) { } } -func TestBigEndianByteAt(t *testing.T) { - +func TestLittleEndianByteAt(t *testing.T) { tests := []struct { x string y int exp byte }{ - {"0", 0, 0x00}, - {"1", 1, 0x00}, - {"0", 1, 0x00}, - {"1", 0, 0x00}, + {"00", 0, 0x00}, + {"01", 1, 0x00}, + {"00", 1, 0x00}, + {"01", 0, 0x00}, {"0000000000000000000000000000000000000000000000000000000000102030", 0, 0x00}, {"0000000000000000000000000000000000000000000000000000000000102030", 1, 0x00}, {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 31, 0x00}, @@ -266,6 +270,7 @@ func TestBigEndianByteAt(t *testing.T) { } } + func TestS256(t *testing.T) { tests := []struct{ x, y *big.Int }{ {x: big.NewInt(0), y: big.NewInt(0)}, |