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D Cookbook

You're reading from   D Cookbook Discover the advantages of programming in D with over 100 incredibly effective recipes with this book and ebook.

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Product type Paperback
Published in May 2014
Publisher
ISBN-13 9781783287215
Length 362 pages
Edition Edition
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Author (1):
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Adam Ruppe Adam Ruppe
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Adam Ruppe
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Toc

Table of Contents (21) Chapters Close

D Cookbook
Credits
Foreword
About the Author
About the Reviewers
www.PacktPub.com
Preface
Core Tasks FREE CHAPTER Phobos – The Standard Library Ranges Integration Resource Management Wrapped Types Correctness Checking Reflection Code Generation Multitasking D for Kernel Coding Web and GUI Programming Addendum Index

Writing a digest utility


Phobos provides a package called std.digest that offers checksum and message digest algorithms through a unified API. Here, we'll create a small MD5 utility that calculates and prints the resulting digest of a file.

How to do it…

Let's print an MD5 digest by executing the following steps:

  1. Create a digest object with the algorithm you need. Here, we'll use MD5 from std.digest.md.

  2. Call the start method.

  3. Use the put method, or the put function from std.range, to feed data to the digest object.

  4. Call the finish method.

  5. Convert hexadecimal data to string if you want.

The code is as follows:

void main(string[] args) {
    import std.digest.md;
    import std.stdio;
    import std.range;

    File file;
    if(args.length > 1)
        file = File(args[1], "rb");
    else
        file = stdin;
    MD5 digest;
    digest.start();
    put(digest, file.byChunk(1024));
    writeln(toHexString(digest.finish()));
}

How it works…

The std.digest package in Phobos defines modules that all...

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