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July 3, 2020 00:57
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Lua telegram unpack util
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--[[ | |
BSD 2-Clause License | |
Copyright (c) 2020, Giuseppe Marino | |
All rights reserved. | |
Redistribution and use in source and binary forms, with or without | |
modification, are permitted provided that the following conditions are met: | |
1. Redistributions of source code must retain the above copyright notice, this | |
list of conditions and the following disclaimer. | |
2. Redistributions in binary form must reproduce the above copyright notice, | |
this list of conditions and the following disclaimer in the documentation | |
and/or other materials provided with the distribution. | |
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
--]] | |
local b = require 'base64' | |
local unpack = string.unpack | |
local byte = string.byte | |
local char = string.char | |
local WEB_LOCATION_FLAG = 1 << 24 | |
local FILE_REFERENCE_FLAG = 1 << 25 | |
local THUMBNAIL = 0x00; | |
local PROFILE_PHOTO = 0x01; | |
local PHOTO = 0x02; | |
local VOICE = 0x03; | |
local VIDEO = 0x04; | |
local DOCUMENT = 0x05; | |
local ENCRYPTED = 0x06; | |
local TEMP = 0x07; | |
local STICKER = 0x08; | |
local AUDIO = 0x09; | |
local GIF = 0x0A; | |
local ENCRYPTED_THUMBNAIL = 0x0B; | |
local WALLPAPER = 0x0C; | |
local VIDEO_NOTE = 0x0D; | |
local SECURE_RAW = 0x0F; | |
local SECURE = 0x10; | |
local BACKGROUND = 0x11; | |
local SIZE = 0x12; | |
local function rleDecode(input) | |
local new = ''; | |
local last = ''; | |
local null = string.char(0); | |
local len = #input | |
for i = 1, len do | |
local cur = input:sub(i, i) | |
if (last == null) then | |
new = new .. string.rep(last, string.byte(cur)); | |
last = ''; | |
else | |
new = new ..last; | |
last = cur; | |
end | |
end | |
return new .. last; | |
end | |
local function posmod(a, b) | |
local resto = a % b; | |
return resto < 0 and (resto + math.abs(b)) or resto; | |
end | |
local function decodeFileID(file_id) | |
local file_info = rleDecode(b.from_b64(file_id)) | |
local file_type = unpack('<b', file_info:sub(1, 1)) | |
local file_flags = unpack('<i', char(0) .. file_info:sub(2, 4)) | |
local version = byte(file_info:sub(-1)) | |
local subVersion = version == 4 and byte(file_info:sub(-2, -1)) or 0 | |
local dc_id = unpack('<i', file_info:sub(5,8)) | |
file_info = file_info:sub(9,-1) | |
local file_reference = nil | |
if not ((file_flags & FILE_REFERENCE_FLAG) == 0) then | |
local frlen = byte(file_info:sub(1,1)) | |
local pad = 0 | |
file_info = char(0) .. file_info:sub(2, -1) | |
if frlen == 254 then | |
frlen = unpack('<i', file_info) | |
pad = math.abs(-frlen % 4) | |
else | |
pad = math.abs(frlen % -4) | |
end | |
file_reference = file_info:sub(1, frlen) | |
file_info = file_info:sub(frlen+pad+1, -1) | |
end | |
local infos = { | |
type = file_type, | |
dc = dc_id, | |
version = version..'.'..subVersion, | |
flags = file_flags, | |
} | |
if file_reference then | |
infos.file_reference = b.to_b64(file_reference) | |
end | |
if file_type == TYPE_THUMBNAIL or file_type == TYPE_PROFILE_PHOTO or file_type == TYPE_PHOTO then | |
local id, access_hash, volume_id, secret, robastrana, local_id = unpack('<llllii', file_info) | |
infos.id = id | |
infos.access_hash = access_hash | |
infos.volume_id = volume_id | |
infos.secret = secret | |
infos.robastrana = robastrana | |
infos.local_id = local_id | |
else | |
local id, access_hash = unpack('<ll', file_info) | |
infos.id = id | |
infos.access_hash = access_hash | |
end | |
if file_type == TYPE_STICKER then | |
infos.creator_id = infos.id >> 32 | |
end | |
return infos | |
end | |
local function decodeInlineMessageId(inline_message_id) | |
local decoded = b.from_b64url(inline_message_id) | |
local dc_id, message_id, chat_id, access_hash = unpack('<iiil', decoded) | |
return { | |
dc = dc_id, | |
message_id = message_id, | |
chat_id = chat_id, | |
access_hash = access_hash | |
} | |
end |
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