Neels Hofmeyr | ad4531a | 2020-02-25 03:19:26 +0100 | [diff] [blame] | 1 | /* Copyright 2020 sysmocom s.f.m.c. GmbH |
| 2 | * SPDX-License-Identifier: Apache-2.0 */ |
| 3 | package org.osmocom.IMSIPseudo; |
| 4 | |
| 5 | public class Bytes { |
| 6 | public static byte nibble2hex(byte nibble) |
| 7 | { |
| 8 | nibble = (byte)(nibble & 0xf); |
| 9 | if (nibble < 0xa) |
| 10 | return (byte)('0' + nibble); |
| 11 | else |
| 12 | return (byte)('a' + nibble - 0xa); |
| 13 | } |
| 14 | |
| 15 | public static byte[] hexdump(byte data[]) |
| 16 | { |
| 17 | byte res[] = new byte[(byte)(data.length*2)]; |
| 18 | for (byte i = 0; i < data.length; i++) { |
| 19 | res[(byte)(i*2)] = nibble2hex((byte)(data[i] >> 4)); |
| 20 | res[(byte)(i*2 + 1)] = nibble2hex(data[i]); |
| 21 | } |
| 22 | return res; |
| 23 | } |
| 24 | |
| 25 | public static boolean equals(byte a[], byte b[]) |
| 26 | { |
| 27 | if (a.length != b.length) |
| 28 | return false; |
| 29 | for (short i = 0; i < (short)a.length; i++) { |
| 30 | if (a[i] != b[i]) |
| 31 | return false; |
| 32 | } |
| 33 | return true; |
| 34 | } |
| 35 | |
| 36 | public static boolean isDigit(byte digits[]) |
| 37 | { |
| 38 | for (short i = 0; i < (short)digits.length; i++) { |
| 39 | if (digits[i] < '0' || digits[i] > '9') |
| 40 | return false; |
| 41 | } |
| 42 | return true; |
| 43 | } |
| 44 | |
| 45 | public static byte[] toStr(byte byte_nr) |
| 46 | { |
| 47 | byte str[]; |
| 48 | short nr = byte_nr; |
| 49 | byte d; |
| 50 | byte l = 0; |
| 51 | if (nr < 0) { |
| 52 | l = 1; |
| 53 | nr = (short)-nr; |
| 54 | } |
| 55 | |
| 56 | if (nr > 99) { |
| 57 | l += 3; |
| 58 | d = 100; |
| 59 | } |
| 60 | else if (nr > 9) { |
| 61 | l += 2; |
| 62 | d = 10; |
| 63 | } |
| 64 | else { |
| 65 | str = new byte[1]; |
| 66 | l += 1; |
| 67 | d = 1; |
| 68 | } |
| 69 | |
| 70 | byte i = 0; |
| 71 | str = new byte[l]; |
| 72 | if (byte_nr < 0) |
| 73 | str[i++] = '-'; |
| 74 | |
| 75 | while (d > 0) { |
| 76 | str[i++] = (byte)('0' + (nr / d)); |
| 77 | nr %= d; |
| 78 | d /= 10; |
| 79 | } |
| 80 | return str; |
| 81 | } |
| 82 | } |