ATL Encoding Reference

Introduction

Hey Ninjas, today we will discuss the ATL Encoding codes. This article will act as a reference for all encoding functions of ATL. First of all, let us define ATL. ATL is the Active Template Library in C/C++ that supports vital COM features. Microsoft created the Component Object Model, commonly known as COM, as a distributed and platform-independent object-oriented system.

Encoding is a process of changing the message in plaintext to some special sequence of characters based on some code. We do encoding of messages to upscale confidentiality so that only the intended individual can understand the message. 

Functions

In C/C++ Active Template Library, there are various functions that are useful in the process of encoding. All of these functions useful for the encoding techniques are stored in a file named “atlenc.h”. In this article, we will see some of the most prominent ones among them. The list of ATL functions related to encoding is as follows:

• AtlGetHexValue: We call this function to get the numeric value of any hexadecimal digit.
   
• AtlHexDecode: We call this function to decode a string of data encoded as hexadecimal text by a previous call to AtlHexEncode.
   
• AtlHexDecodeGetRequiredLength: We call this function to get the size of a buffer (in bytes) that could contain the data decoded from a hex-encoded string of a specified length.
   
• AtlHexEncode: We call this function to encode data as a string of hexadecimal text.
   
• AtlHexEncodeGetRequiredLength: We call this function to get the size of a buffer (in characters) that could contain the string encoded from data of the specified size.
   
• AtlUnicodeToUTF8: We call this function for the conversion of a Unicode string to UTF-8.
   
• BEncode: We call this function for the conversion of some data through the "B" encoding.
   
• BEncodeGetRequiredLength: We call this function to get the size of a buffer (in characters) that could contain the string encoded from data of the specified size.
   
• EscapeXML: We call this function to convert characters to their safe equivalents, which are unsafe for use in XML.
   
• GetExtendedChars: We call this function to get the count of the number of extended characters in a string.
   
• IsExtendedChar: We call this function to find out whether a given character is an extended character. Meaning that it is less than 32 and greater than 126. Also, it is not a tab, line feed, or carriage return.
   
• QEncode: We call this function for the conversion of some data through the "Q" encoding.
   
• QEncodeGetRequiredLength: We call this function to get the size of a buffer (in characters) that could contain the string encoded from data of the specified size.
   
• QPDecode: We use this function to decode a string of data encoded in a quoted-printable format by a previous call to QPEncode.
   
• QPDecodeGetRequiredLength: We call this function to get the size of a buffer (in characters) that could contain the data decoded from a quoted-printable-encoded string of the specified size.
   
• QPEncode: We call this function to encode some data into the quoted-printable format.
   
• QPEncodeGetRequiredLength: We call this function to get the size of a buffer (in characters) that could contain the string encoded from data of the specified size.
   
• UUDecode: We use this function to decode a string of data that has been uuencoded by a previous call to UUEncode.
   
• UUDecodeGetRequiredLength: We call this function to get the size of a buffer (in characters) that could contain the data decoded from a uuencoded string of the specified length.
   
• UUEncode: We call this function for the uuencoding of some data.
   
• UUEncodeGetRequiredLength: We call this function to get the size in characters of a buffer that could contain a string encoded from data of the specified size.
   

Check out this problem - Shortest Common Supersequence.