forked from cerc-io/plugeth
common/math, core/vm: Un-expose bigEndianByteAt, use correct terms for endianness
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3285a0fda3
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@ -130,10 +130,10 @@ func PaddedBigBytes(bigint *big.Int, n int) []byte {
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return ret
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}
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// LittleEndianByteAt returns the byte at position n,
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// if bigint is considered little-endian.
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// So n==0 gives the least significant byte
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func LittleEndianByteAt(bigint *big.Int, n int) byte {
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// bigEndianByteAt returns the byte at position n,
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// if bigint is considered big-endian.
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// So n==0 returns the least significant byte
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func bigEndianByteAt(bigint *big.Int, n int) byte {
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words := bigint.Bits()
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// Check word-bucket the byte will reside in
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i := n / wordBytes
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@ -147,15 +147,15 @@ func LittleEndianByteAt(bigint *big.Int, n int) byte {
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return byte(word >> shift)
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}
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// BigEndian32ByteAt returns the byte at position n,
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// if bigint is considered big-endian.
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// So n==0 gives the most significant byte
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// WARNING: Only works for bigints in 32-byte range
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func BigEndian32ByteAt(bigint *big.Int, n int) byte {
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if n > 31 {
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// Byte returns the byte at position n,
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// if bigint is considered little-endian with the supplied padlength.
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// n==0 returns the most significant byte
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// bigint '5', padlength 32, n=31 => 5
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func Byte(bigint *big.Int, padlength, n int) byte {
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if n >= padlength {
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return byte(0)
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}
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return LittleEndianByteAt(bigint, 31-n)
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return bigEndianByteAt(bigint, padlength-1-n)
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}
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// ReadBits encodes the absolute value of bigint as big-endian bytes. Callers must ensure
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@ -157,13 +157,13 @@ func BenchmarkPaddedBigBytesSmallOnePadding(b *testing.B) {
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func BenchmarkByteAtBrandNew(b *testing.B) {
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bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC")
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for i := 0; i < b.N; i++ {
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BigEndian32ByteAt(bigint, 15)
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bigEndianByteAt(bigint, 15)
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}
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}
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func BenchmarkByteAt(b *testing.B) {
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bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC")
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for i := 0; i < b.N; i++ {
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BigEndian32ByteAt(bigint, 15)
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bigEndianByteAt(bigint, 15)
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}
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}
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func BenchmarkByteAtOld(b *testing.B) {
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@ -225,7 +225,7 @@ func TestLittleEndianByteAt(t *testing.T) {
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}
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for _, test := range tests {
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v := new(big.Int).SetBytes(common.Hex2Bytes(test.x))
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actual := LittleEndianByteAt(v, test.y)
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actual := bigEndianByteAt(v, test.y)
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if actual != test.exp {
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t.Fatalf("Expected [%v] %v:th byte to be %v, was %v.", test.x, test.y, test.exp, actual)
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}
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@ -254,11 +254,12 @@ func TestBigEndianByteAt(t *testing.T) {
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{"0000000000000000000000000000000000000000000000000000000000102030", 31, 0x30},
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{"0000000000000000000000000000000000000000000000000000000000102030", 30, 0x20},
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{"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 32, 0x0},
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{"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 0xFFFFFFFF, 0x0},
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{"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 31, 0xFF},
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{"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 0xFFFF, 0x0},
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}
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for _, test := range tests {
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v := new(big.Int).SetBytes(common.Hex2Bytes(test.x))
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actual := BigEndian32ByteAt(v, test.y)
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actual := Byte(v, 32, test.y)
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if actual != test.exp {
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t.Fatalf("Expected [%v] %v:th byte to be %v, was %v.", test.x, test.y, test.exp, actual)
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}
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@ -258,8 +258,8 @@ func opXor(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stac
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func opByte(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
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th, val := stack.pop(), stack.peek()
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if th.Cmp(common.Big32) < 0 {
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b := math.BigEndian32ByteAt(val, int(th.Int64()))
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val.SetInt64(int64(b))
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b := math.Byte(val, 32, int(th.Int64()))
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val.SetUint64(uint64(b))
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} else {
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val.SetUint64(0)
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}
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