Convert HEX to ASCIIDOC

Why Convert HEX to ASCIIDOC?

Converting HEX data to ASCIIDOC format bridges the gap between raw hexadecimal data and professional technical documentation. When engineers and analysts work with hex dumps from firmware, network captures, or memory inspections, they often need to present their findings in comprehensive technical reports. ASCIIDOC provides the ideal output format for creating these structured, publishable documents from decoded hex content.

ASCIIDOC (with the .asciidoc extension) is functionally equivalent to ADOC and uses the same AsciiDoc markup language. The format was designed from the ground up for technical writing, offering features like source code blocks with language-specific syntax highlighting, complex tables with column spanning, admonition blocks for important notes, and conditional content inclusion. These capabilities make it particularly well-suited for documenting decoded hex data in context.

The conversion process transforms hexadecimal byte sequences into readable text and structures the output as a complete AsciiDoc document. This decoded content can then be enriched with AsciiDoc markup elements such as section headers, callout annotations, and cross-references. The resulting document serves as both a human-readable report and a source file for generating multiple output formats including HTML pages, PDF reports, and EPUB publications.

For organizations that use AsciiDoc-based documentation pipelines (such as those built with Antora or Spring REST Docs), converting hex data directly to ASCIIDOC format means the decoded information can be immediately integrated into existing documentation systems. This streamlines workflows where binary analysis results need to be incorporated into larger technical documentation sets.

Key Benefits of Converting HEX to ASCIIDOC:

• Professional Output: Create publication-quality documents from hex data
• Source Code Blocks: Display hex listings with proper formatting and highlighting
• Document Modularity: Use include directives to compose larger documents
• Conditional Content: Show different content based on document attributes
• Cross-References: Link between sections and external documents
• Pipeline Integration: Feed into Antora, AsciiBinder, or custom build systems
• Collaborative Editing: Plain text format works well with Git version control

Practical Examples

Example 1: Firmware Analysis Report

Input HEX file (firmware.hex):

46 69 72 6D 77 61 72 65
20 76 32 2E 31 0A 42 6F
6F 74 6C 6F 61 64 65 72
20 52 65 61 64 79

Output ASCIIDOC file (firmware.asciidoc):

= Firmware Analysis Report
:toc: left
:sectnums:

== Decoded Content

Firmware v2.1
Bootloader Ready

== Summary

The firmware header indicates
version 2.1 with an active
bootloader status.

Example 2: Network Packet Documentation

Input HEX file (packet.hex):

47 45 54 20 2F 69 6E 64
65 78 2E 68 74 6D 6C 20
48 54 54 50 2F 31 2E 31
0D 0A 48 6F 73 74 3A

Output ASCIIDOC file (packet.asciidoc):

= Network Packet Analysis

== HTTP Request

GET /index.html HTTP/1.1
Host:

== Protocol Details

[cols="1,3"]
|===
|Method |GET
|Path |/index.html
|Version |HTTP/1.1
|===

Example 3: Encoded Log File Conversion

Input HEX file (log.hex):

5B 49 4E 46 4F 5D 20 53
65 72 76 69 63 65 20 73
74 61 72 74 65 64 0A 5B
57 41 52 4E 5D 20 4C 6F
77 20 6D 65 6D 6F 72 79

Output ASCIIDOC file (log.asciidoc):

= System Log Analysis

== Log Entries

[INFO] Service started
[WARN] Low memory

== Observations

NOTE: The service started
successfully but reported
a low memory warning that
should be investigated.

Frequently Asked Questions (FAQ)

Q: What is the difference between ASCIIDOC and ADOC?

A: ASCIIDOC (.asciidoc) and ADOC (.adoc) are two file extensions for the same AsciiDoc markup language. The .adoc extension is the shorter, more commonly used convention, while .asciidoc is the full-length extension. Both are processed identically by Asciidoctor and other AsciiDoc tools.

Q: How is hex data decoded during conversion?

A: Each pair of hexadecimal digits is converted to its corresponding byte value, then interpreted as a text character using the appropriate encoding (typically UTF-8 or ASCII). For example, 48 65 6C 6C 6F decodes to "Hello". The decoded text is then formatted as an AsciiDoc document.

Q: Can ASCIIDOC handle code blocks from hex data?

A: Yes, AsciiDoc has excellent code block support with syntax highlighting for over 100 programming languages. Decoded hex data that contains source code can be placed in delimited source blocks with language annotations for proper syntax highlighting in the output.

Q: What tools do I need to view ASCIIDOC files?

A: You can view raw ASCIIDOC files in any text editor. To render them as formatted documents, use Asciidoctor (Ruby gem), Asciidoctor.js (Node.js), or IDE plugins for VS Code or IntelliJ IDEA. GitHub and GitLab also render ASCIIDOC files automatically in repositories.

Q: Is ASCIIDOC suitable for large documentation projects?

A: Absolutely. AsciiDoc was specifically designed for large-scale documentation. Features like include directives, document attributes, conditional content, and cross-references make it ideal for multi-chapter books, technical manuals, and documentation sites. Tools like Antora build entire documentation portals from AsciiDoc sources.

Q: Can I convert the ASCIIDOC output to PDF?

A: Yes. Use asciidoctor-pdf to convert ASCIIDOC files directly to PDF with customizable themes. You can also convert to DocBook XML first and then use other toolchains (like dblatex or fop) for PDF generation with different styling options.

Q: What happens to non-printable hex values?

A: Non-printable byte values (such as control characters below 0x20, except common ones like newline 0x0A and tab 0x09) may appear as replacement characters or be stripped during conversion. The converter handles standard text encoding, so hex data representing readable content produces the best results.

Q: Does the converter preserve the original hex structure?

A: The converter decodes hex data into readable text and formats it as an ASCIIDOC document. The original hex byte layout is not preserved in the output, as the purpose is to produce a human-readable document. If you need to display hex values within the document, you can use AsciiDoc code blocks.