findBindPairForInStream(index) {
        const bindPairs = this.bindPairs;
        for (let i = 0; i < bindPairs.length; i++) {
            if (bindPairs[i].inIndex === index) {
                return i;
            }
        }
        return -1;
    }
We use not solid archive. Folder represent the packed stream. It means, that if we have 117 files (regular files, not directories), we will have 117 folders.

Each folder has 1-n packed streams. Even for non-solid archive. For our purposes indices in the packedStreams is not required, only count of packed streams is important.
Because packed streams for folder located in series (grouped).