How to realize that only specified characters are allowed to appear in the compression result?

[xw]

You have provided the following functions, but none of them meet the requirements, because in my use case only specified characters are allowed to appear in the compression result.

• compress
• compressToUTF16
• compressToBase64
• compressToEncodedURIComponent
• compressToUint8Array

Transmission of characters other than 12AB is not allowed in my use case.

Suppose I need to compress BBC, without lz-string, I might do this:

var userDict = `12AB`
var split = userDict.slice(0, 1)
var sysDict = userDict.slice(1)
var table = {
  A: sysDict.repeat(1), // 2AB
  B: sysDict.repeat(2), // 2AB2AB
  C: sysDict.repeat(3), // 2AB2AB2AB
}
var table2 = Object.entries(table).reduce((acc, [key, val]) => (acc[val]= key, acc), {})

// the string to be compressed
var str = `BBC`

// ['2AB2AB', '2AB2AB', '2AB2AB2AB'].join('1')
var compressed = str.split(``).map(str => table[str]).join(split)
// compressed = '2AB2AB12AB2AB12AB2AB2AB'

var decompressed = compressed.split(split).map(str => table2[str]).join(``)

However, I managed to control the encoding result within the range of 12AB, but failed to compress the data. How can I get help with lz-string?

[xw]

Sorry for duplicate of this:

#169 (comment)