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https://github.com/bchainhub/signal124

Binary data to GSM 7-bit transfer
https://github.com/bchainhub/signal124

binary-to-text gsm7 signal124

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Binary data to GSM 7-bit transfer

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# Signal124

## Binary data to GSM 7-bit transfer



> Signal124 is a method focusing to transfer binary data in obsolete communication in the most effective way.

> Ideal for streaming short binary strings to the network.

> It is effective because 124 GSM accepted chars were used instead of other Base distributions.



The current algorithm has been written for the most usable way for obsolete communication. For minifying data is recommended to use a compressor before encoding.



## Alphabet



Signal124 needs 124 characters to represent the encoded binary data in ASCII.

> From the 128 [GSM 03.38 characters](https://en.wikipedia.org/wiki/GSM_03.38), the following three ones have been omitted:



| Char | Explanation | Verdict |

| --- | --- | --- |

| LF | a Line Feed control | excluded |

| ESC | an Escape control | excluded |



> Strings with special meaning:



| Char | Explanation | Verdict |

| --- | --- | --- |

| SP | a Space character; indicate the use of the encoding | excluded |

| CR | a Carriage Return control; used as a delimiter between messages | excluded |



### The translation table is composed of following characters:



| № | Symbol | № | Symbol | № | Symbol | № | Symbol | № | Symbol | № | Symbol | № | Symbol | № | Symbol |

| ---: | :--- | ---: | :--- | ---: | :--- | ---: | :--- | ---: | :--- | ---: | :--- | ---: | :--- | ---: | :--- |

| 0 | @ | 14 | Δ | ✕ | SP | 44 | 0 | 60 | ¡ | 76 | P | 92 | ¿ | 108 | p |

| 1 | £ | 15 | _ | 29 | ! | 45 | 1 | 61 | A | 77 | Q | 93 | a | 109 | q |

| 2 | $ | 16 | Φ | 30 | " | 46 | 2 | 62 | B | 78 | R | 94 | b | 110 | r |

| 3 | ¥ | 17 | Γ | 31 | # | 47 | 3 | 63 | C | 79 | S | 95 | c | 111 | s |

| 4 | è | 18 | Λ | 32 | ¤ | 48 | 4 | 64 | D | 80 | T | 96 | d | 112 | t |

| 5 | é | 19 | Ω | 33 | % | 49 | 5 | 65 | E | 81 | U | 97 | e | 113 | u |

| 6 | ù | 20 | Π | 34 | & | 50 | 6 | 66 | F | 82 | V | 98 | f | 114 | v |

| 7 | ì | 21 | Ψ | 35 | ' | 51 | 7 | 67 | G | 83 | W | 99 | g | 115 | w |

| 8 | ò | 22 | Σ | 36 | ( | 52 | 8 | 68 | H | 84 | X | 100 | h | 116 | x |

| 9 | Ç | 23 | Θ | 37 | ) | 53 | 9 | 69 | I | 85 | Y | 101 | i | 117 | y |

| ✕ | LF | 24 | Ξ | 38 | * | 54 | : | 70 | J | 86 | Z | 102 | j | 118 | z |

| 10 | Ø | ✕ | ESC | 39 | + | 55 | ; | 71 | K | 87 | Ä | 103 | k | 119 | ä |

| 11 | ø | 25 | Æ | 40 | , | 56 | < | 72 | L | 88 | Ö | 104 | l | 120 | ö |

| ✕ | CR | 26 | æ | 41 | - | 57 | = | 73 | M | 89 | Ñ | 105 | m | 121 | ñ |

| 12 | Å | 27 | ß | 42 | . | 58 | > | 74 | N | 90 | Ü | 106 | n | 122 | ü |

| 13 | å | 28 | É | 43 | / | 59 | ? | 75 | O | 91 | § | 107 | o | 123 | à |



## Example of transaction



> Encoded:



 tØàù;Θf£&0ì8E(Å


J#c+§ΦèCØå


CΩÄ+'6¿£/ù



- a Space character indicates the encoding is used (optional)

- a Carriage return is a delimiter for next data



> Decoded:



space - encoding signal124



Hell-o World


John Doe


signal01



## Distributions



* [Go](go)

* [PHP](php)



## Project



Please, feel free to contribute to this project to improve it and integrate it into use cases.



You can raise [issue](issues) or send [pull](pulls) request.



## Compression



Consider using lossless compression before transferring and streaming your data. Probably you want to achieve a compromise between fast encoding and data size.



Examples of lossless compression libraries:



* [Brotli](https://github.com/google/brotli) - allows a denser packing than gzip and deflate

* [LZ4](https://github.com/lz4/lz4) - compression and decompression speed

* [Snappy](https://github.com/google/snappy) - aims for very high speeds and reasonable compression



## License



[CORE License](LICENSE)