Predefined dictionary

[eroom1966]

@siara-cc
Hi Arun
I wonder if you could advise, as to the application of this code

I need to compress short strings of between 40 and 80 characters
The dictionary is small in terms, for example

• Always Upper case characters
• Small set of non-alphanumeric
• Small set of full words

There is a very small dictionary of words, of which many are used repetitively, so I want to be able to define substrings with a code, in addition to characters
The size of the dictionary itself, is not important the dictionary is pre-defined, and not provided with the compressed data. the dictionary is known to the encode and decode itself

The question is, if I have this pre-defined dictionary, can I embed this with your project ?

Thx
Lee

[siara-cc]

Hi, you could change the code to accomplish this.
But you can use code from this library: https://github.com/siara-cc/Unishox_Arduino_Progmem_lib
to achieve what you want without changing anything.
It does not use a pre-defined dictionary, but it has all the short strings in an array and words that are re-used in subsequent lines are referred from the previous lines.
The library itself is for the Arduino platform, but you can get it working for C.
Compress using -G option in Unishox library (this repo)
Decompress using decodeRepeat() function in Unishox_Arduino_Progmem_lib