pulseplot/lib/rfraw.js

Pulse data viewer JS library

/**
    @file RfRaw JS.

    @author Christian W. Zuckschwerdt <zany@triq.net>
    @copyright Christian W. Zuckschwerdt, 2020
    @license
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.
*/

import { Hexbuffer } from './hexbuffer.js'

export class RfRaw {
    static isRfRaw(line) {
        return line.trim().startsWith('AA')
    }
    static getPulses(line) {
        let pulses = []
        // split codes on '+' or space between '55 AAB'
        line = line.replace(/5\s*5[+\s]+A\s*A\s*B/g, '55;AAB')
        const codes = line.split(';')
        for (let code of codes) {
            const p = RfRaw.getCodePulses(code)
            pulses = pulses.concat(p)
        }
        return pulses
    }
    static getCodePulses(line) {
        // AA B1 04 017C 046A 0BCC 2378 3818190908181908190909090908190819081818190909091A 55
        console.log('parsing rfraw data: ', line)
        let pulses = []
        const buf = new Hexbuffer(line)

        const sync = buf.getByte()
        if (sync != 0xaa) {
            return pulses
        }

        const fmt = buf.getByte()
        let len
        let buckets
        let repeats
        if (fmt == 0xb1) {
            // s.a. https://github.com/Portisch/RF-Bridge-EFM8BB1/wiki/Decode-0xB1-sniffed-data
            buckets = buf.getByte()
        }
        else if (fmt == 0xb0) {
            // s.a. https://github.com/Portisch/RF-Bridge-EFM8BB1/wiki/0xB0
            len = buf.getByte()
            buckets = buf.getByte()
            repeats = buf.getByte()
        }
        else {
            return pulses
        }

        let bucket = []
        for (let b = 0; b < buckets; ++b) {
            bucket[b] = buf.getWord()
        }
        console.log(`buckets: ${buckets} (len ${len} repeats ${repeats}): `, bucket)
        let v3format = false
        const bufSafe = buf.index
        while (buf.hasNibble()) {
            const n = buf.getNibble()
            if (n > 7) {
                v3format = true
                break
            }
        }
        buf.index = bufSafe
        console.log('RfRaw v3 format: ', v3format)

        if (!v3format) {
            pulses.push(0) // rfraw starts with a gap
            while (buf.hasNibble()) {
                if (buf.peekByte() == 0x55) break // sync end
                const b = buf.getNibble()
                if (b > buckets) break // error
                pulses.push(bucket[b])
            }
            pulses.push(0) // rfraw ends with a pulse

            if (repeats)
                return new Array(repeats).fill(pulses).flat()
            return pulses
        }

        let dataHigh = true
        while (buf.hasNibble()) {
            if (buf.peekByte() == 0x55) break // sync end
            const n = buf.getNibble()
            const b = n & 7
            if (b > buckets) break // error
            if (n & 8) {
                if (!dataHigh)
                    pulses.push(0)
                pulses.push(bucket[b])
                dataHigh = false
            }
            else {
                if (dataHigh)
                    pulses.push(0)
                pulses.push(bucket[b])
                dataHigh = true
            }
        }
        if (!dataHigh)
            pulses.push(0) // add last gap

        if (repeats)
            return new Array(repeats).fill(pulses).flat()
        return pulses
    }
}