Binary Encoding

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A binary-to-text encoding is encoding of binary encoding example in plain text. More precisely, it binary encoding example an encoding of binary data in a sequence of printable characters. These encodings are necessary for transmission of data when the channel does not allow binary data such as email or NNTP or is not 8-bit clean.

The ASCII text-encoding standard uses unique values 0— to represent the alphabetic, numeric, and punctuation characters commonly used in Englishplus a selection of control codes which do not represent printable characters.

In contrast, most computers store data in memory organized in eight-bit bytes. Files that contain machine-executable code and non-textual data typically contain all possible eight-bit byte values. Many computer programs came to rely on this distinction between seven-bit text and eight-bit binary data, and would not function properly if non-ASCII characters appeared in data that was expected to include only ASCII text.

For example, if the value of the eighth bit is not preserved, the program might interpret a byte value above as a flag telling it to perform some function.

It is often desirable, however, to be able to send non-textual data through text-based systems, such binary encoding example when one might attach an image file to an e-mail message. To accomplish this, the data is encoded in some way, such that eight-bit data is encoded into seven-bit ASCII characters generally using only alphanumeric and punctuation characters—the ASCII printable characters.

Upon safe arrival at its destination, it is then decoded back to its eight-bit form. This process is referred to as binary to text encoding. Binary-to-text encoding methods are also used as a mechanism for encoding plain text.

By using a binary-to-text encoding on messages that are already plain text, then decoding on the other end, one binary encoding example make such systems appear to be completely transparent.

The table below compares the most used forms of binary-to-text binary encoding example. The efficiency binary encoding example is the ratio between number of bits in the input and the number of bits in the encoded output.

A series of small English words is easier for humans to read, remember, binary encoding example type in than decimal or other binary-to-text encoding systems. Some of these encoding quoted-printable and percent encoding are based on a set of allowed characters and a single escape character.

The binary encoding example characters are left unchanged, while all other characters are converted into a string starting with the escape character. This kind of conversion allows the resulting text to be almost readable, in that letters and digits are part of the allowed characters, and are therefore left as they are in the encoded text. Some other encodings base64uuencoding are based on mapping all possible sequences of six bits into different printable characters. A given sequence of bytes is translated by viewing it as stream of bits, breaking this stream in chunks of six bits and generating the sequence of corresponding characters.

The different encodings differ in the mapping between sequences of bits and characters and in how the resulting text is formatted. Some encodings the original version of BinHex and the recommended encoding for CipherSaber use four bits instead of six, mapping all possible sequences of 4 bits onto the 16 standard hexadecimal digits. From Wikipedia, the free encyclopedia. This article has multiple issues.

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Encoding all but the 94 characters which don't need it incl. Info-Kermit Digest Mailing list. Kermit Project, Columbia University. Retrieved 3 March Printable Encodings for Binary Files". Retrieved 1 March Retrieved from " https: Binary-to-text encoding formats Computer file formats Character encoding. Articles that may contain original research from April All articles that may contain original research Articles needing binary encoding example references from December All articles needing additional references Articles with multiple maintenance issues.

Views Read Edit View history. This page was last edited on 26 Marchat binary encoding example By using this site, you agree to the Terms of Use and Privacy Policy. Similar to Base64, but modified to avoid both non-alphanumeric characters and letters which might look ambiguous when printed. CPython Python 2. Developed by Columbia University for its Kermit protocol [3]. See Quoted-printable and Base CPythonprobably many others. PerlCprobably many others. C, [4] Python ,

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Truncated binary encoding is an entropy encoding typically used for uniform probability distributions with a finite alphabet. It is parameterized by an alphabet with total size of number n.

It is a slightly more general form of binary encoding when n is not a power of two. Truncated binary encoding assigns the first u symbols the codewords 00, 01, and 10, all of length 2, then assigns the last n - u symbols the codewords and , the last two codewords of length 3.

For example, if n is 5, plain binary encoding and truncated binary encoding allocates the following codewords. Digits shown struck are not transmitted in truncated binary. The process to encode the number x in truncated binary is: If x is less than u , encode it in k binary bits.

Unused patterns are not shown in this table. To decode, read the first k bits. If they encode a value less than u , decoding is complete. Otherwise, read an additional bit and subtract u from the result. Here is a more extreme case: The routine Binary is expository; usually just the rightmost len bits of the variable x are desired. Here we simply output the binary code for x using len bits, padding with high-order 0's if necessary. From Wikipedia, the free encyclopedia.

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December Learn how and when to remove this template message. Retrieved from " https: Articles lacking sources from December All articles lacking sources. Views Read Edit View history. This page was last edited on 12 March , at By using this site, you agree to the Terms of Use and Privacy Policy.