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// This file is part of gnunet-go, a GNUnet-implementation in Golang.
// Copyright (C) 2019, 2020 Bernd Fix >Y<
//
// gnunet-go is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// gnunet-go is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: AGPL3.0-or-later
package util
import (
"fmt"
)
// Error variables
var (
ErrUtilArrayTooSmall = fmt.Errorf("array to small")
)
//----------------------------------------------------------------------
// generic array helpers
//----------------------------------------------------------------------
// Clone creates a new array of same content as the argument.
func Clone[T []E, E any](d T) T {
r := make(T, len(d))
copy(r, d)
return r
}
// Equals returns true if two arrays match.
func Equals[T []E, E comparable](a, b T) bool {
if len(a) != len(b) {
return false
}
for i, e := range a {
if e != b[i] {
return false
}
}
return true
}
// Reverse the content of an array
func Reverse[T []E, E any](b T) T {
bl := len(b)
r := make(T, bl)
for i := 0; i < bl; i++ {
r[bl-i-1] = b[i]
}
return r
}
// IsAll returns true if all elements in an array are set to null.
func IsAll[T []E, E comparable](b T, null E) bool {
for _, v := range b {
if v != null {
return false
}
}
return true
}
// Fill an array with a value
func Fill[T []E, E any](b T, val E) {
for i := range b {
b[i] = val
}
}
//----------------------------------------------------------------------
// byte array helpers
//----------------------------------------------------------------------
// CopyAlignedBlock copies 'in' to 'out' so that 'out' is filled completely.
// - If 'in' is larger than 'out', it is left-truncated before copy
// - If 'in' is smaller than 'out', it is left-padded with 0 before copy
func CopyAlignedBlock(out, in []byte) {
count := len(in)
size := len(out)
from, to := 0, 0
if count > size {
from = count - size
} else if count < size {
to = size - count
for i := 0; i < to; i++ {
out[i] = 0
}
}
copy(out[to:], in[from:])
}
//----------------------------------------------------------------------
// String list helpers
//----------------------------------------------------------------------
// StringList converts a binary representation of a string list. Each string
// is '\0'-terminated. The whole byte array is parsed; if the final string is
// not terminated, it is skipped.
func StringList(b []byte) []string {
res := make([]string, 0)
str := ""
for _, ch := range b {
if ch == 0 {
res = append(res, str)
str = ""
continue
}
str += string(ch)
}
return res
}
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