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utils.go
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/
utils.go
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package deserializer
import (
"encoding/binary"
"io"
"math/big"
fp "github.com/consensys/gnark-crypto/ecc/bn254/fp"
)
func readULE32(reader io.Reader) (uint32, error) {
var buffer = make([]byte, 4)
_, err := reader.Read(buffer)
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint32(buffer), nil
}
func readULE64(reader io.Reader) (uint64, error) {
var buffer = make([]byte, 8)
_, err := reader.Read(buffer)
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint64(buffer), nil
}
func readBigInt(reader io.Reader, n8 uint32) (big.Int, error) {
var buffer = make([]byte, n8)
_, err := reader.Read(buffer)
reverseSlice(buffer)
if err != nil {
return *big.NewInt(0), err
}
bigInt := big.NewInt(0).SetBytes(buffer)
return *bigInt, nil
}
func reverseSlice(slice []byte) []byte {
for i := 0; i < len(slice)/2; i++ {
j := len(slice) - i - 1
slice[i], slice[j] = slice[j], slice[i]
}
return slice
}
func bytesToElement(b []byte) fp.Element {
var z fp.Element
reverseSlice(b)
if len(b) < 32 {
b = append(b, make([]byte, 32-len(b))...)
}
z[0] = binary.LittleEndian.Uint64(b[0:8])
z[1] = binary.LittleEndian.Uint64(b[8:16])
z[2] = binary.LittleEndian.Uint64(b[16:24])
z[3] = binary.LittleEndian.Uint64(b[24:32])
return z
}