Expose IR/RF conversion functions (#788)

* Move IR duration<->Broadlink conversion down from CLI

* Fix --learn base64 to not crash with --durations

Also remove its b'...' wrapping.

* Fix IR/RF conversions

---------

Co-authored-by: William Grant <me@williamgrant.id.au>

broadlink/remote.py

@@ -6,6 +6,47 @@ from . import exceptions as e
 from .device import Device
 
 
+def pulses_to_data(pulses: t.List[int], tick: int = 32.84) -> None:
+    """Convert a microsecond duration sequence into a Broadlink IR packet."""
+    result = bytearray(4)
+    result[0x00] = 0x26
+
+    for pulse in pulses:
+        div, mod = divmod(int(pulse // tick), 256)
+        if div:
+            result.append(0)
+            result.append(div)
+        result.append(mod)
+
+    data_len = len(result) - 4
+    result[0x02] = data_len & 0xFF
+    result[0x03] = data_len >> 8
+
+    return result
+
+
+def data_to_pulses(data: bytes, tick: int = 32.84) -> t.List[int]:
+    """Parse a Broadlink packet into a microsecond duration sequence."""
+    result = []
+    index = 4
+    end = min(256 * data[0x03] + data[0x02] + 4, len(data))
+
+    while index < end:
+        chunk = data[index]
+        index += 1
+
+        if chunk == 0:
+            try:
+                chunk = 256 * data[index] + data[index + 1]
+            except IndexError:
+                raise ValueError("Malformed data.")
+            index += 2
+
+        result.append(int(chunk * tick))
+
+    return result
+
+
 class rmmini(Device):
     """Controls a Broadlink RM mini 3."""
 

cli/broadlink_cli

@@ -1,68 +1,32 @@
 #!/usr/bin/env python3
 import argparse
 import base64
-import codecs
 import time
+import typing as t
 
 import broadlink
 from broadlink.const import DEFAULT_PORT
 from broadlink.exceptions import ReadError, StorageError
+from broadlink.remote import data_to_pulses, pulses_to_data
 
-TICK = 32.84
 TIMEOUT = 30
-IR_TOKEN = 0x26
 
 
 def auto_int(x):
     return int(x, 0)
 
 
-def to_microseconds(bytes):
-    result = []
-    #  print bytes[0] # 0x26 = 38for IR
-    index = 4
-    while index < len(bytes):
-        chunk = bytes[index]
-        index += 1
-        if chunk == 0:
-            chunk = bytes[index]
-            chunk = 256 * chunk + bytes[index + 1]
-            index += 2
-        result.append(int(round(chunk * TICK)))
-        if chunk == 0x0d05:
-            break
-    return result
+def format_pulses(pulses: t.List[int]) -> str:
+    """Format pulses."""
+    return " ".join(
+        f"+{pulse}" if i % 2 == 0 else f"-{pulse}"
+        for i, pulse in enumerate(pulses)
+    )
 
 
-def durations_to_broadlink(durations):
-    result = bytearray()
-    result.append(IR_TOKEN)
-    result.append(0)
-    result.append(len(durations) % 256)
-    result.append(len(durations) / 256)
-    for dur in durations:
-        num = int(round(dur / TICK))
-        if num > 255:
-            result.append(0)
-            result.append(num / 256)
-        result.append(num % 256)
-    return result
-
-
-def format_durations(data):
-    result = ''
-    for i in range(0, len(data)):
-        if len(result) > 0:
-            result += ' '
-        result += ('+' if i % 2 == 0 else '-') + str(data[i])
-    return result
-
-
-def parse_durations(str):
-    result = []
-    for s in str.split():
-        result.append(abs(int(s)))
-    return result
+def parse_pulses(data: t.List[str]) -> t.List[int]:
+    """Parse pulses."""
+    return [abs(int(s)) for s in data]
 
 
 parser = argparse.ArgumentParser(fromfile_prefix_chars='@')
@@ -112,8 +76,8 @@ if args.joinwifi:
 
 if args.convert:
     data = bytearray.fromhex(''.join(args.data))
-    durations = to_microseconds(data)
-    print(format_durations(durations))
+    pulses = data_to_pulses(data)
+    print(format_pulses(pulses))
 if args.temperature:
     print(dev.check_temperature())
 if args.humidity:
@@ -125,8 +89,11 @@ if args.sensors:
     for key in data:
         print("{} {}".format(key, data[key]))
 if args.send:
-    data = durations_to_broadlink(parse_durations(' '.join(args.data))) \
-        if args.durations else bytearray.fromhex(''.join(args.data))
+    data = (
+        pulses_to_data(parse_pulses(args.data))
+        if args.durations
+        else bytes.fromhex(''.join(args.data))
+    )
     dev.send_data(data)
 if args.learn or (args.learnfile and not args.rflearn):
     dev.enter_learning()
@@ -144,17 +111,19 @@ if args.learn or (args.learnfile and not args.rflearn):
         print("No data received...")
         exit(1)
 
-    learned = format_durations(to_microseconds(bytearray(data))) \
-        if args.durations \
-        else ''.join(format(x, '02x') for x in bytearray(data))
-    if args.learn:
-        print(learned)
-        decode_hex = codecs.getdecoder("hex_codec")
-        print("Base64: " + str(base64.b64encode(decode_hex(learned)[0])))
+    print("Packet found!")
+    raw_fmt = data.hex()
+    base64_fmt = base64.b64encode(data).decode('ascii')
+    pulse_fmt = format_pulses(data_to_pulses(data))
+
+    print("Raw:", raw_fmt)
+    print("Base64:", base64_fmt)
+    print("Pulses:", pulse_fmt)
+
     if args.learnfile:
         print("Saving to {}".format(args.learnfile))
         with open(args.learnfile, "w") as text_file:
-            text_file.write(learned)
+            text_file.write(pulse_fmt if args.durations else raw_fmt)
 if args.check:
     if dev.check_power():
         print('* ON *')
@@ -238,14 +207,15 @@ if args.rflearn:
         exit(1)
 
     print("Packet found!")
-    learned = format_durations(to_microseconds(bytearray(data))) \
-        if args.durations \
-        else ''.join(format(x, '02x') for x in bytearray(data))
-    if args.learnfile is None:
-        print(learned)
-        decode_hex = codecs.getdecoder("hex_codec")
-        print("Base64: {}".format(str(base64.b64encode(decode_hex(learned)[0]))))
-    if args.learnfile is not None:
+    raw_fmt = data.hex()
+    base64_fmt = base64.b64encode(data).decode('ascii')
+    pulse_fmt = format_pulses(data_to_pulses(data))
+
+    print("Raw:", raw_fmt)
+    print("Base64:", base64_fmt)
+    print("Pulses:", pulse_fmt)
+
+    if args.learnfile:
         print("Saving to {}".format(args.learnfile))
         with open(args.learnfile, "w") as text_file:
-            text_file.write(learned)
+            text_file.write(pulse_fmt if args.durations else raw_fmt)