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commom.go
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/
commom.go
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package utils
import (
"crypto/rand"
sdk "plugchain-sdk-go/types"
)
// GenerateRandomBytes returns securely generated random bytes.
// It will return an error if the system's secure random
// number generator fails to function correctly, in which
// case the caller should not continue.
func GenerateRandomBytes(n int) ([]byte, error) {
b := make([]byte, n)
_, err := rand.Read(b)
// Note that err == nil only if we read len(b) bytes.
if err != nil {
return nil, err
}
return b, nil
}
func SubArray(subLen int, array sdk.SplitAble) (segments []sdk.SplitAble) {
maxLen := array.Len()
if maxLen <= subLen {
return []sdk.SplitAble{array}
}
batch := maxLen / subLen
if maxLen%subLen > 0 {
batch++
}
for i := 1; i <= batch; i++ {
start := (i - 1) * subLen
end := i * subLen
if i != batch {
segments = append(segments, array.Sub(start, end))
} else {
segments = append(segments, array.Sub(start, array.Len()))
}
}
return segments
}
func ParsePage(page uint64, size uint64) (offset, limit uint64) {
if page == 0 {
page = 1
}
if size == 0 {
size = 10
}
offset = (page - 1) * size
limit = size
return
}