tox-weechat/src/twc-utils.c

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/*
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* Copyright (c) 2015 Håvard Pettersson <mail@haavard.me>
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*
* This file is part of Tox-WeeChat.
*
* Tox-WeeChat 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 3 of the License, or
* (at your option) any later version.
*
* Tox-WeeChat is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox-WeeChat. If not, see <http://www.gnu.org/licenses/>.
*/
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#include <string.h>
#include <stdio.h>
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#include <weechat/weechat-plugin.h>
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#include <tox/tox.h>
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#include "twc.h"
#include "twc-config.h"
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#include "twc-utils.h"
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/**
* Convert a hex string to it's binary equivalent of max size bytes.
*/
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void
twc_hex2bin(const char *hex, size_t size, uint8_t *out)
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{
const char *position = hex;
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size_t i;
for (i = 0; i < size; ++i)
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{
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sscanf(position, "%2hhx", &out[i]);
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position += 2;
}
}
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/**
* Convert size bytes to a hex string. out must be at lesat size * 2 + 1
* bytes.
*/
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void
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twc_bin2hex(const uint8_t *bin, size_t size, char *out)
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{
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char *position = out;
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size_t i;
for (i = 0; i < size; ++i)
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{
sprintf(position, "%02X", bin[i]);
position += 2;
}
*position = 0;
}
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/**
* Return a null-terminated copy of str. Must be freed.
*/
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char *
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twc_null_terminate(const uint8_t *str, size_t length)
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{
char *str_null = malloc(length + 1);
memcpy(str_null, str, length);
str_null[length] = 0;
return str_null;
}
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/**
* Get the null-terminated name of a Tox friend. Must be freed.
*/
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char *
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twc_get_name_nt(Tox *tox, int32_t friend_number)
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{
size_t length = tox_get_name_size(tox, friend_number);
uint8_t name[length];
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// if no name, return client ID instead
if (!length)
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return twc_get_friend_id_short(tox, friend_number);
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tox_get_name(tox, friend_number, name);
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return twc_null_terminate(name, length);
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}
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/**
* Return the null-terminated status message of a Tox friend. Must be freed.
*/
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char *
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twc_get_status_message_nt(Tox *tox, int32_t friend_number)
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{
size_t length = tox_get_status_message_size(tox, friend_number);
uint8_t message[length];
tox_get_status_message(tox, friend_number, message, length);
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return twc_null_terminate(message, length);
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}
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/**
* Return the name of a group chat peer as a null terminated string. Must be
* freed.
*/
char *
twc_get_peer_name_nt(Tox *tox, int32_t group_number, int32_t peer_number)
{
uint8_t name[TOX_MAX_NAME_LENGTH] = {0};
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int length = tox_group_peername(tox, group_number, peer_number, name);
if (length >= 0)
return twc_null_terminate(name, length);
else
return "<unknown>";
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}
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/**
* Return the users own name, null-terminated. Must be freed.
*/
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char *
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twc_get_self_name_nt(Tox *tox)
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{
size_t length = tox_get_self_name_size(tox);
uint8_t name[length];
tox_get_self_name(tox, name);
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return twc_null_terminate(name, length);
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}
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/**
* Return a friend's Tox ID in short form. Return value must be freed.
*/
char *
twc_get_friend_id_short(Tox *tox, int32_t friend_number)
{
uint8_t client_id[TOX_CLIENT_ID_SIZE];
tox_get_client_id(tox, friend_number, client_id);
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size_t short_id_length = weechat_config_integer(twc_config_short_id_size);
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char *hex_address = malloc(short_id_length + 1);
twc_bin2hex(client_id,
short_id_length / 2,
hex_address);
return hex_address;
}
/**
* Reverse the bytes of a 32-bit integer.
*/
uint32_t
twc_uint32_reverse_bytes(uint32_t num)
{
uint32_t res = 0;
res += num & 0xFF; num >>= 8; res <<= 8;
res += num & 0xFF; num >>= 8; res <<= 8;
res += num & 0xFF; num >>= 8; res <<= 8;
res += num & 0xFF;
return res;
}
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/**
* Hash a Tox ID of size TOX_CLIENT_ID_SIZE bytes using a modified djb2 hash.
*/
unsigned long long
twc_hash_tox_id(const uint8_t *tox_id)
{
unsigned long long hash = 5381;
for (size_t i = 0; i < TOX_CLIENT_ID_SIZE; ++i)
hash ^= (hash << 5) + (hash >> 2) + tox_id[i];
return hash;
}