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+ file-part-hex
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‎README.md

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| English |
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# Introduction
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Handy scripts collection for handling files.
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Handy scripts for handling files.
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Usage instructions are placed under each folder.
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Make life of reboot easier.
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# file-part-hex
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Hex view of part of a file.
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# Roadmap
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1. file-part-hex: Hex view of part of a file.
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2. compare-2-folders
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compare-2-folders
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- - - -
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收集 Linux 运行状态，包括进程、网络、挂载点、环境变量，写入 linux.status 文件夹。
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可用于重启前先记录，重启后对照记录核对服务是否齐全，让重启工作轻松点。
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# file-part-hex
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十六进制显示文件部分内容。

‎file-part-hex/FilePartHex.java

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import java.io.*;
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import java.util.*;
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//----------------------------------------------------------------------------
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/**
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* Hex view of part of a file.
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*
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* <p>
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* Written by CHEN Qingcan, Spring 2020, Foshan China <br>
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* Open source under WTFPL (Do What The Fuck You Want To Public License) http://www.wtfpl.net
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*
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* <p>
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* Run as script via Java 11: <br>
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* <code>
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* java FilePartHex.java
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* </code>
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*/
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public final class FilePartHex {
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static final BufferedReader stdin = new BufferedReader (new InputStreamReader (System.in));
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static final PrintStream stdout = System.out;
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static final PrintStream stderr = System.err;
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static final String HR = "--------";
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static Config config = null;
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static class Config {
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String where;
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Integer offset = 0;
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Integer length = 0x10 * 0x10;
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//--------------------------------------------------------------------
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static Config getInstance (final String... args) throws IOException {
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return args.length > 0 ? fromArgs (args) : fromStdIn ();
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}
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//--------------------------------------------------------------------
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/** Get configuration from command line arguments. */
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static Config fromArgs (final String... args) {
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var config = new Config ();
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if (args.length >= 1) {
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config.where = args[0];
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}
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try {
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if (args.length >= 2) {
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config.offset = Integer.valueOf (args[1]);
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}
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if (args.length >= 3) {
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config.length = Integer.valueOf (args[2]);
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}
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} catch (NumberFormatException e) {
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stderr.println ("Argument offset and length should be a number.");
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}
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return config;
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}
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//--------------------------------------------------------------------
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/** Get configuration from standard input. */
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private static Config fromStdIn () throws IOException {
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var config = new Config ();
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config.where = stdinLine ("", "File path: ");
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try { config.offset = Integer.valueOf (stdinLine ("0", "Offset (default to 0): ")); }
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catch (NumberFormatException e) { /* ignore */ }
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try { config.length = Integer.valueOf (stdinLine ("256", "Length (default to 256): ")); }
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catch (NumberFormatException e) { /* ignore */ }
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return config;
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}
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//--------------------------------------------------------------------
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/** Prompt and then read a line from standard input. Return default value if empty input. */
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static String stdinLine (final String defaultLine, final String format, final Object... args)
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throws IOException {
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stdout.printf (format, args);
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String line = stdin.readLine ().trim ();
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return line.length () > 0 ? line : defaultLine;
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}
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}
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//------------------------------------------------------------------------
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/** Program entry */
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public static void main (final String... args) {
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try {
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config = Config.getInstance (args);
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var r = input ();
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output (r);
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} catch (IOException e) {
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stderr.println (e.getMessage ());
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}
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}
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//------------------------------------------------------------------------
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/** Read bytes from file */
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private static byte[] input () throws FileNotFoundException, IOException {
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try (var in = new FileInputStream (config.where)) {
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var r = new byte [config.length];
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in.skip (config.offset);
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int n = in.read (r, 0, config.length);
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return Arrays.copyOf (r, n > 0 ? n : 0);
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}
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}
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//------------------------------------------------------------------------
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/** Bytes in hex to standard output. */
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private static void output (final byte[] r) {
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// table header
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stdout.println (config.where);
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stdout.printf ("offset %d (%X in hex) length %d (%X in hex)%n",
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config.offset, config.offset, config.length, config.length);
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// column header
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stdout.print ("\t ");
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for (int i = 0 ; i < 0x10 ; i++) {
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stdout.printf ("%02X ", i);
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}
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stdout.printf ("%n\t ");
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for (int i = 0 ; i < 0x10 * 3 ; i++) {
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stdout.print ('-');
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}
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var visible = new StringBuilder ();
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for (int i = 0 ; i < r.length ; i++) {
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if (i % 0x10 == 0) {
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// line header
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stdout.println (visible.toString ());
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visible.setLength (0);
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stdout.printf ("%02X\t| ", config.offset + i);
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}
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stdout.printf ("%02X ", r[i]);
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visible.append (r[i] >= 0x20 && r[i] <= 0x7E ? (char) r[i] : '.');
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}
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stdout.println (visible.toString ());
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}
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}

‎file-part-hex/README.md

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| English |
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# file-part-hex
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Hex view of part of a file.
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# System Requirements
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Java ≥ 11
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# Usage
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If no command line argument provided, the script will prompt to ask.
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Windows:
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```dos
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file-part-hex.bat [file] [offset] [length]
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```
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Linux:
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```bash
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./file-part-hex.sh [file] [offset] [length]
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```
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# Further Development
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Preview window supports MBCS (Multi-Byte Character Set), like GB2312, GBK, UTF-8, UTF-16.
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- - - -
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| Chinese | 中文 |
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# file-part-hex
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十六进制显示文件部分内容。
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# 系统需求
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Java ≥ 11
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# 用法
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如无命令行参数，脚本将提示输入。
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Windows:
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```dos
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file-part-hex.bat [file] [offset] [length]
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```
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Linux:
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```bash
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./file-part-hex.sh [file] [offset] [length]
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```
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# 展望
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支持多字节字符 (MBCS) 的预览，如 GB2312、GBK、UTF-8、UTF-16。

‎file-part-hex/file-part-hex.bat

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@echo off
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if defined JAVA_HOME (
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set JAVA=%JAVA_HOME%\bin\java
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) else if defined JRE_HOME (
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set JAVA=%JRE_HOME%\bin\java
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) else (
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set JAVA=java
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)
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%JAVA% FilePartHex.java %*

‎file-part-hex/file-part-hex.sh

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#!/usr/bin/bash
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java FilePartHex.java $*

‎find-charset-files/FindCharsetFiles.java

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//--------------------------------------------------------------------
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/** Get configuration from standard input. */
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static Config fromStdIn ()
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throws IOException {
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static Config fromStdIn () throws IOException {
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var config = new Config ();
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String line;
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