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NGC_HS1/ngc_ft1.cpp

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#include "./ngc_ft1.h"
#include "ngc_ext_common.hpp"
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#include <vector>
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#include <deque>
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#include <unordered_map>
#include <map>
#include <optional>
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#include <cassert>
struct SendSequenceBuffer {
struct SSBEntry {
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std::vector<uint8_t> data; // the data (variable size, but smaller than 500)
float time_since_activity {0.f};
};
// sequence_id -> entry
std::map<uint16_t, SSBEntry> entries;
uint16_t next_seq_id {0};
void erase(uint16_t seq) {
entries.erase(seq);
}
// inflight chunks
size_t size(void) const {
return entries.size();
}
uint16_t add(std::vector<uint8_t>&& data) {
entries[next_seq_id] = {data, 0.f};
return next_seq_id++;
}
template<typename FN>
void for_each(float time_delta, FN&& fn) {
for (auto& [id, entry] : entries) {
entry.time_since_activity += time_delta;
fn(id, entry.data, entry.time_since_activity);
}
}
};
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struct RecvSequenceBuffer {
struct RSBEntry {
std::vector<uint8_t> data;
};
// sequence_id -> entry
std::map<uint16_t, RSBEntry> entries;
uint16_t next_seq_id {0};
// list of seq_ids to ack, this is seperate bc rsbentries are deleted once processed
std::deque<uint16_t> ack_seq_ids;
void erase(uint16_t seq) {
entries.erase(seq);
}
// inflight chunks
size_t size(void) const {
return entries.size();
}
void add(uint16_t seq_id, std::vector<uint8_t>&& data) {
entries[seq_id] = {data};
ack_seq_ids.push_back(seq_id);
if (ack_seq_ids.size() > 5) { // TODO: magic
ack_seq_ids.pop_front();
}
}
bool canPop(void) const {
return entries.count(next_seq_id);
}
std::vector<uint8_t> pop(void) {
assert(canPop());
auto tmp_data = entries.at(next_seq_id).data;
erase(next_seq_id);
next_seq_id++;
return tmp_data;
}
// for acking, might be bad since its front
std::vector<uint16_t> frontSeqIDs(size_t count = 5) const {
std::vector<uint16_t> seq_ids;
auto it = entries.cbegin();
for (size_t i = 0; i < 5 && it != entries.cend(); i++, it++) {
seq_ids.push_back(it->first);
}
return seq_ids;
}
};
struct NGC_FT1 {
NGC_FT1_options options;
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std::unordered_map<NGC_FT1_file_kind, NGC_FT1_recv_request_cb*> cb_recv_request;
std::unordered_map<NGC_FT1_file_kind, NGC_FT1_recv_init_cb*> cb_recv_init;
std::unordered_map<NGC_FT1_file_kind, NGC_FT1_recv_data_cb*> cb_recv_data;
std::unordered_map<NGC_FT1_file_kind, NGC_FT1_send_data_cb*> cb_send_data;
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struct Group {
struct Peer {
struct RecvTransfer {
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NGC_FT1_file_kind file_kind;
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std::vector<uint8_t> file_id;
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enum class State {
INITED, //init acked, but no data received yet (might be dropped)
RECV, // receiving data
} state;
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// float time_since_last_activity ?
size_t file_size {0};
size_t file_size_current {0};
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// sequence id based reassembly
RecvSequenceBuffer rsb;
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};
std::array<std::optional<RecvTransfer>, 256> recv_transfers;
size_t next_recv_transfer_idx {0}; // next id will be 0
struct SendTransfer {
NGC_FT1_file_kind file_kind;
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std::vector<uint8_t> file_id;
enum class State {
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INIT_SENT, // keep this state until ack or deny or giveup
SENDING, // we got the ack and are now sending data
// is this real?
FINISHING, // we sent all data but acks still outstanding????
FINFIN, // we sent the data_fin and are waiting for the data_fin_ack
// delete
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} state;
size_t inits_sent {1}; // is sent when creating
float time_since_activity {0.f};
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size_t file_size {0};
size_t file_size_current {0};
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// sequence array
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// list of sent but not acked seq_ids
SendSequenceBuffer ssb;
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};
std::array<std::optional<SendTransfer>, 256> send_transfers;
size_t next_send_transfer_idx {0}; // next id will be 0
};
std::map<uint32_t, Peer> peers;
};
std::map<uint32_t, Group> groups;
};
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// send pkgs
static bool _send_pkg_FT1_REQUEST(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t file_kind, const uint8_t* file_id, size_t file_id_size);
static bool _send_pkg_FT1_INIT(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t file_kind, uint64_t file_size, uint8_t transfer_id, const uint8_t* file_id, size_t file_id_size);
static bool _send_pkg_FT1_INIT_ACK(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id);
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static bool _send_pkg_FT1_DATA(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, uint16_t sequence_id, const uint8_t* data, size_t data_size);
static bool _send_pkg_FT1_DATA_ACK(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, const uint16_t* seq_ids, size_t seq_ids_size);
//static bool _send_pkg_FT1_DATA_FIN(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id);
//static bool _send_pkg_FT1_DATA_FIN_ACK(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id);
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// handle pkgs
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static void _handle_FT1_REQUEST(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
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static void _handle_FT1_INIT(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
static void _handle_FT1_INIT_ACK(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
static void _handle_FT1_DATA(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
static void _handle_FT1_DATA_ACK(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
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//static void _handle_FT1_DATA_FIN(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
//static void _handle_FT1_DATA_FIN_ACK(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
bool NGC_FT1_init(NGC_EXT_CTX* ngc_ext_ctx, const struct NGC_FT1_options* options) {
ngc_ext_ctx->ngc_ft1_ctx = new NGC_FT1;
ngc_ext_ctx->ngc_ft1_ctx->options = *options;
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ngc_ext_ctx->callbacks[FT1_REQUEST] = _handle_FT1_REQUEST;
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ngc_ext_ctx->callbacks[FT1_INIT] = _handle_FT1_INIT;
ngc_ext_ctx->callbacks[FT1_INIT_ACK] = _handle_FT1_INIT_ACK;
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ngc_ext_ctx->callbacks[FT1_DATA] = _handle_FT1_DATA;
ngc_ext_ctx->callbacks[FT1_DATA_ACK] = _handle_FT1_DATA_ACK;
return true;
}
void NGC_FT1_kill(NGC_EXT_CTX* ngc_ext_ctx) {
delete ngc_ext_ctx->ngc_ft1_ctx;
ngc_ext_ctx->ngc_ft1_ctx = nullptr;
}
void NGC_FT1_iterate(Tox *tox, NGC_EXT_CTX* ngc_ext_ctx/*, void *user_data*/) {
assert(ngc_ext_ctx);
assert(ngc_ext_ctx->ngc_ft1_ctx);
for (auto& [group_number, group] : ngc_ext_ctx->ngc_ft1_ctx->groups) {
for (auto& [peer_number, peer] : group.peers) {
//for (auto& tf_opt : peer.send_transfers) {
for (size_t idx = 0; idx < peer.send_transfers.size(); idx++) {
auto& tf_opt = peer.send_transfers[idx];
if (tf_opt) {
auto& tf = tf_opt.value();
tf.time_since_activity += 0.025f; // TODO: actual delta
switch (tf.state) {
using State = NGC_FT1::Group::Peer::SendTransfer::State;
case State::INIT_SENT:
if (tf.time_since_activity >= 20.f) {
if (tf.inits_sent >= 3) {
// delete, timed out 3 times
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fprintf(stderr, "FT: warning, ft init timed out, deleting\n");
tf_opt.reset();
continue;
} else {
// timed out, resend
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fprintf(stderr, "FT: warning, ft init timed out, resending\n");
_send_pkg_FT1_INIT(tox, group_number, peer_number, tf.file_kind, tf.file_size, idx, tf.file_id.data(), tf.file_id.size());
tf.inits_sent++;
tf.time_since_activity = 0.f;
}
}
break;
case State::SENDING: {
tf.ssb.for_each(0.025f, [&](uint16_t id, const std::vector<uint8_t>& data, float& time_since_activity) {
// no ack after 10 sec -> resend
if (time_since_activity >= 10.f) {
_send_pkg_FT1_DATA(tox, group_number, peer_number, idx, id, data.data(), data.size());
time_since_activity = 0.f;
}
});
assert(ngc_ext_ctx->ngc_ft1_ctx->cb_send_data.count(tf.file_kind));
// if chunks in flight < window size (1 lol)
while (tf.ssb.size() < 1) {
std::vector<uint8_t> new_data;
size_t chunk_size = std::min<size_t>(10u, tf.file_size - tf.file_size_current);
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if (chunk_size == 0) {
// TODO: set to finishing?
break; // we done
}
new_data.resize(chunk_size);
ngc_ext_ctx->ngc_ft1_ctx->cb_send_data[tf.file_kind](tox, ngc_ext_ctx, group_number, peer_number, idx, tf.file_size_current, new_data.data(), new_data.size());
uint16_t seq_id = tf.ssb.add(std::move(new_data));
_send_pkg_FT1_DATA(tox, group_number, peer_number, idx, seq_id, tf.ssb.entries.at(seq_id).data.data(), tf.ssb.entries.at(seq_id).data.size());
fprintf(stderr, "FT: sent data size: %ld (seq %d)\n", chunk_size, seq_id);
tf.file_size_current += chunk_size;
}
}
break;
case State::FINISHING:
break;
// finfin o.o
default: // invalid state, delete
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fprintf(stderr, "FT: error, ft in invalid state, deleting\n");
tf_opt.reset();
continue;
}
}
}
}
}
}
void NGC_FT1_register_callback_recv_request(
NGC_EXT_CTX* ngc_ext_ctx,
NGC_FT1_file_kind file_kind,
NGC_FT1_recv_request_cb* callback
) {
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assert(ngc_ext_ctx);
assert(ngc_ext_ctx->ngc_ft1_ctx);
ngc_ext_ctx->ngc_ft1_ctx->cb_recv_request[file_kind] = callback;
}
void NGC_FT1_register_callback_recv_init(
NGC_EXT_CTX* ngc_ext_ctx,
NGC_FT1_file_kind file_kind,
NGC_FT1_recv_init_cb* callback
) {
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assert(ngc_ext_ctx);
assert(ngc_ext_ctx->ngc_ft1_ctx);
ngc_ext_ctx->ngc_ft1_ctx->cb_recv_init[file_kind] = callback;
}
void NGC_FT1_register_callback_recv_data(
NGC_EXT_CTX* ngc_ext_ctx,
NGC_FT1_file_kind file_kind,
NGC_FT1_recv_data_cb* callback
) {
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assert(ngc_ext_ctx);
assert(ngc_ext_ctx->ngc_ft1_ctx);
ngc_ext_ctx->ngc_ft1_ctx->cb_recv_data[file_kind] = callback;
}
void NGC_FT1_register_callback_send_data(
NGC_EXT_CTX* ngc_ext_ctx,
NGC_FT1_file_kind file_kind,
NGC_FT1_send_data_cb* callback
) {
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assert(ngc_ext_ctx);
assert(ngc_ext_ctx->ngc_ft1_ctx);
ngc_ext_ctx->ngc_ft1_ctx->cb_send_data[file_kind] = callback;
}
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void NGC_FT1_send_request(
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Tox *tox, NGC_EXT_CTX* ngc_ext_ctx,
uint32_t group_number,
NGC_FT1_file_kind file_kind,
const uint8_t* file_id,
size_t file_id_size
) {
// just call private for every peer in group?
for (;;) {
uint32_t peer_number = 0;
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NGC_FT1_send_request_private(tox, ngc_ext_ctx, group_number, peer_number, file_kind, file_id, file_id_size);
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assert(false && "not implemented");
}
}
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void NGC_FT1_send_request_private(
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Tox *tox, NGC_EXT_CTX* ngc_ext_ctx,
uint32_t group_number,
uint32_t peer_number,
NGC_FT1_file_kind file_kind,
const uint8_t* file_id,
size_t file_id_size
) {
assert(tox);
assert(ngc_ext_ctx);
assert(ngc_ext_ctx->ngc_ft1_ctx);
// record locally that we sent(or want to send) the request?
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_send_pkg_FT1_REQUEST(tox, group_number, peer_number, file_kind, file_id, file_id_size);
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}
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bool NGC_FT1_send_init_private(
Tox *tox, NGC_EXT_CTX* ngc_ext_ctx,
uint32_t group_number, uint32_t peer_number,
NGC_FT1_file_kind file_kind,
const uint8_t* file_id, size_t file_id_size,
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size_t file_size,
uint8_t* transfer_id
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) {
//fprintf(stderr, "TODO: init ft for %08X\n", msg_id);
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fprintf(stderr, "FT: init ft\n");
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if (tox_group_peer_get_connection_status(tox, group_number, peer_number, nullptr) == TOX_CONNECTION_NONE) {
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fprintf(stderr, "FT: error: cant init ft, peer offline\n");
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return false;
}
auto& peer = ngc_ext_ctx->ngc_ft1_ctx->groups[group_number].peers[peer_number];
// allocate transfer_id
size_t idx = peer.next_send_transfer_idx;
peer.next_send_transfer_idx = (peer.next_send_transfer_idx + 1) % 256;
{ // TODO: extract
size_t i = idx;
bool found = false;
do {
if (!peer.send_transfers[i].has_value()) {
// free slot
idx = i;
found = true;
break;
}
i = (i + 1) % 256;
} while (i != idx);
if (!found) {
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fprintf(stderr, "FT: error: cant init ft, no free transfer slot\n");
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return false;
}
}
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_send_pkg_FT1_INIT(tox, group_number, peer_number, file_kind, file_size, idx, file_id, file_id_size);
peer.send_transfers[idx] = NGC_FT1::Group::Peer::SendTransfer{
file_kind,
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std::vector(file_id, file_id+file_id_size),
NGC_FT1::Group::Peer::SendTransfer::State::INIT_SENT,
1,
0.f,
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file_size,
0,
};
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if (transfer_id != nullptr) {
*transfer_id = idx;
}
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return true;
}
static bool _send_pkg_FT1_REQUEST(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t file_kind, const uint8_t* file_id, size_t file_id_size) {
// - 1 byte packet id
// - 1 byte (TODO: more?) file_kind
// - X bytes file_id
std::vector<uint8_t> pkg;
pkg.push_back(FT1_REQUEST);
pkg.push_back(file_kind);
for (size_t i = 0; i < file_id_size; i++) {
pkg.push_back(file_id[i]);
}
// lossless
return tox_group_send_custom_private_packet(tox, group_number, peer_number, true, pkg.data(), pkg.size(), nullptr);
}
static bool _send_pkg_FT1_INIT(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t file_kind, uint64_t file_size, uint8_t transfer_id, const uint8_t* file_id, size_t file_id_size) {
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// - 1 byte packet id
// - 1 byte (file_kind)
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// - 8 bytes (data size)
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// - 1 byte (temporary_file_tf_id, for this peer only, technically just a prefix to distinguish between simultainious fts)
// - X bytes (file_kind dependent id, differnt sizes)
std::vector<uint8_t> pkg;
pkg.push_back(FT1_INIT);
pkg.push_back(file_kind);
for (size_t i = 0; i < sizeof(file_size); i++) {
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pkg.push_back((file_size>>(i*8)) & 0xff);
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}
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pkg.push_back(transfer_id);
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for (size_t i = 0; i < file_id_size; i++) {
pkg.push_back(file_id[i]);
}
// lossless
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return tox_group_send_custom_private_packet(tox, group_number, peer_number, true, pkg.data(), pkg.size(), nullptr);
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}
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static bool _send_pkg_FT1_INIT_ACK(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id) {
// send ack
// - 1 byte packet id
// - 1 byte transfer_id
std::vector<uint8_t> pkg;
pkg.push_back(FT1_INIT_ACK);
pkg.push_back(transfer_id);
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// lossless
return tox_group_send_custom_private_packet(tox, group_number, peer_number, true, pkg.data(), pkg.size(), nullptr);
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}
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static bool _send_pkg_FT1_DATA(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, uint16_t sequence_id, const uint8_t* data, size_t data_size) {
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assert(data_size > 0);
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// TODO
// check header_size+data_size <= max pkg size
std::vector<uint8_t> pkg;
pkg.push_back(FT1_DATA);
pkg.push_back(transfer_id);
pkg.push_back(sequence_id & 0xff);
pkg.push_back((sequence_id >> (1*8)) & 0xff);
// TODO: optimize
for (size_t i = 0; i < data_size; i++) {
pkg.push_back(data[i]);
}
// lossless?
return tox_group_send_custom_private_packet(tox, group_number, peer_number, true, pkg.data(), pkg.size(), nullptr);
}
static bool _send_pkg_FT1_DATA_ACK(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, const uint16_t* seq_ids, size_t seq_ids_size) {
std::vector<uint8_t> pkg;
pkg.push_back(FT1_DATA_ACK);
pkg.push_back(transfer_id);
// TODO: optimize
for (size_t i = 0; i < seq_ids_size; i++) {
pkg.push_back(seq_ids[i] & 0xff);
pkg.push_back((seq_ids[i] >> (1*8)) & 0xff);
}
// lossless?
return tox_group_send_custom_private_packet(tox, group_number, peer_number, true, pkg.data(), pkg.size(), nullptr);
}
//static bool _send_pkg_FT1_DATA_FIN(const Tox* tox, uint32_t group_number, uint32_t peer_number, uint8_t transfer_id) {
//std::vector<uint8_t> pkg;
//pkg.push_back(FT1_DATA_FIN);
//pkg.push_back(transfer_id);
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//// lossless?
//return tox_group_send_custom_private_packet(tox, group_number, peer_number, true, pkg.data(), pkg.size(), nullptr);
//}
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#define _DATA_HAVE(x, error) if ((length - curser) < (x)) { error; }
static void _handle_FT1_REQUEST(
Tox* tox,
NGC_EXT_CTX* ngc_ext_ctx,
uint32_t group_number,
uint32_t peer_number,
const uint8_t *data,
size_t length
) {
size_t curser = 0;
// TODO: might be uint16_t or even larger
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uint8_t file_kind_u8;
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_DATA_HAVE(sizeof(file_kind_u8), fprintf(stderr, "FT: packet too small, missing file_kind\n"); return)
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file_kind_u8 = data[curser++];
auto file_kind = static_cast<NGC_FT1_file_kind>(file_kind_u8);
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fprintf(stderr, "FT: got FT request with file_kind %u [", file_kind_u8);
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for (size_t curser_copy = curser; curser_copy < length; curser_copy++) {
fprintf(stderr, "%02X", data[curser_copy]);
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}
fprintf(stderr, "]\n");
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NGC_FT1_recv_request_cb* fn_ptr = nullptr;
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if (ngc_ext_ctx->ngc_ft1_ctx->cb_recv_request.count(file_kind)) {
fn_ptr = ngc_ext_ctx->ngc_ft1_ctx->cb_recv_request.at(file_kind);
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}
if (fn_ptr) {
fn_ptr(tox, ngc_ext_ctx, group_number, peer_number, data+curser, length-curser);
} else {
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fprintf(stderr, "FT: missing cb for requests\n");
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}
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}
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static void _handle_FT1_INIT(
Tox* tox,
NGC_EXT_CTX* ngc_ext_ctx,
uint32_t group_number,
uint32_t peer_number,
const uint8_t *data,
size_t length
) {
size_t curser = 0;
// - 1 byte (file_kind)
// TODO: might be uint16_t or even larger
uint8_t file_kind_u8;
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_DATA_HAVE(sizeof(file_kind_u8), fprintf(stderr, "FT: packet too small, missing file_kind\n"); return)
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file_kind_u8 = data[curser++];
auto file_kind = static_cast<NGC_FT1_file_kind>(file_kind_u8);
// - 8 bytes (data size)
size_t file_size {0u};
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_DATA_HAVE(sizeof(file_size), fprintf(stderr, "FT: packet too small, missing file_size\n"); return)
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for (size_t i = 0; i < sizeof(file_size); i++, curser++) {
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file_size |= size_t(data[curser]) << (i*8);
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}
// - 1 byte (temporary_file_tf_id, for this peer only, technically just a prefix to distinguish between simultainious fts)
uint8_t transfer_id;
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_DATA_HAVE(sizeof(transfer_id), fprintf(stderr, "FT: packet too small, missing transfer_id\n"); return)
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transfer_id = data[curser++];
// - X bytes (file_kind dependent id, differnt sizes)
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const std::vector file_id(data+curser, data+curser+(length-curser));
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fprintf(stderr, "FT: got FT init with file_kind:%u file_size:%lu tf_id:%u [", file_kind_u8, file_size, transfer_id);
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for (size_t curser_copy = curser; curser_copy < length; curser_copy++) {
fprintf(stderr, "%02X", data[curser_copy]);
}
fprintf(stderr, "]\n");
// check if slot free ?
// did we allready ack this and the other side just did not see the ack?
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NGC_FT1_recv_init_cb* fn_ptr = nullptr;
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if (ngc_ext_ctx->ngc_ft1_ctx->cb_recv_init.count(file_kind)) {
fn_ptr = ngc_ext_ctx->ngc_ft1_ctx->cb_recv_init.at(file_kind);
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}
bool accept_ft;
if (fn_ptr) {
// last part of message (file_id) is not yet parsed, just give it to cb
accept_ft = fn_ptr(tox, ngc_ext_ctx, group_number, peer_number, data+curser, length-curser, transfer_id, file_size);
} else {
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fprintf(stderr, "FT: missing cb for init\n");
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accept_ft = false;
}
if (accept_ft) {
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_send_pkg_FT1_INIT_ACK(tox, group_number, peer_number, transfer_id);
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fprintf(stderr, "FT: accepted init\n");
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auto& peer = ngc_ext_ctx->ngc_ft1_ctx->groups[group_number].peers[peer_number];
if (peer.recv_transfers[transfer_id].has_value()) {
fprintf(stderr, "FT: overwriting existing recv_transfer %d\n", transfer_id);
}
peer.recv_transfers[transfer_id] = NGC_FT1::Group::Peer::RecvTransfer{
file_kind,
file_id,
NGC_FT1::Group::Peer::RecvTransfer::State::INITED,
file_size,
0u,
};
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} else {
// TODO deny?
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fprintf(stderr, "FT: rejected init\n");
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}
}
static void _handle_FT1_INIT_ACK(
Tox* tox,
NGC_EXT_CTX* ngc_ext_ctx,
uint32_t group_number,
uint32_t peer_number,
const uint8_t *data,
size_t length
) {
size_t curser = 0;
// - 1 byte (transfer_id)
uint8_t transfer_id;
_DATA_HAVE(sizeof(transfer_id), fprintf(stderr, "FT: packet too small, missing transfer_id\n"); return)
transfer_id = data[curser++];
// we now should start sending data
auto& groups = ngc_ext_ctx->ngc_ft1_ctx->groups;
if (!groups.count(group_number)) {
fprintf(stderr, "FT: init_ack for unknown group\n");
return;
}
NGC_FT1::Group::Peer& peer = groups[group_number].peers[peer_number];
if (!peer.send_transfers[transfer_id].has_value()) {
fprintf(stderr, "FT: inti_ack for unknown transfer\n");
return;
}
NGC_FT1::Group::Peer::SendTransfer& transfer = peer.send_transfers[transfer_id].value();
using State = NGC_FT1::Group::Peer::SendTransfer::State;
if (transfer.state != State::INIT_SENT) {
fprintf(stderr, "FT: inti_ack but not in INIT_SENT state\n");
return;
}
// iterate will now call NGC_FT1_send_data_cb
transfer.state = State::SENDING;
transfer.time_since_activity = 0.f;
}
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static void _handle_FT1_DATA(
Tox* tox,
NGC_EXT_CTX* ngc_ext_ctx,
uint32_t group_number,
uint32_t peer_number,
const uint8_t *data, size_t length
) {
size_t curser = 0;
// - 1 byte (transfer_id)
uint8_t transfer_id;
_DATA_HAVE(sizeof(transfer_id), fprintf(stderr, "FT: packet too small, missing transfer_id\n"); return)
transfer_id = data[curser++];
// - 2 bytes (sequence_id)
uint16_t sequence_id;
_DATA_HAVE(sizeof(sequence_id), fprintf(stderr, "FT: packet too small, missing sequence_id\n"); return)
sequence_id = data[curser++];
sequence_id |= data[curser++] << (1*8);
if (curser == length) {
fprintf(stderr, "FT: data of size 0!\n");
return;
}
auto& groups = ngc_ext_ctx->ngc_ft1_ctx->groups;
if (!groups.count(group_number)) {
fprintf(stderr, "FT: data for unknown group\n");
return;
}
NGC_FT1::Group::Peer& peer = groups[group_number].peers[peer_number];
if (!peer.recv_transfers[transfer_id].has_value()) {
fprintf(stderr, "FT: data for unknown transfer\n");
return;
}
auto& transfer = peer.recv_transfers[transfer_id].value();
// do reassembly, ignore dups
transfer.rsb.add(sequence_id, std::vector<uint8_t>(data+curser, data+curser+(length-curser)));
NGC_FT1_recv_data_cb* fn_ptr = nullptr;
if (ngc_ext_ctx->ngc_ft1_ctx->cb_recv_data.count(transfer.file_kind)) {
fn_ptr = ngc_ext_ctx->ngc_ft1_ctx->cb_recv_data.at(transfer.file_kind);
}
if (!fn_ptr) {
fprintf(stderr, "FT: missing cb for recv_data\n");
return;
}
// loop for chunks without holes
while (transfer.rsb.canPop()) {
auto data = transfer.rsb.pop();
fn_ptr(tox, ngc_ext_ctx, group_number, peer_number, transfer_id, transfer.file_size_current, data.data(), data.size());
transfer.file_size_current += data.size();
}
// send acks
std::vector<uint16_t> ack_seq_ids(transfer.rsb.ack_seq_ids.cbegin(), transfer.rsb.ack_seq_ids.cend());
if (!ack_seq_ids.empty()) {
_send_pkg_FT1_DATA_ACK(tox, group_number, peer_number, transfer_id, ack_seq_ids.data(), ack_seq_ids.size());
}
}
static void _handle_FT1_DATA_ACK(
Tox* tox,
NGC_EXT_CTX* ngc_ext_ctx,
uint32_t group_number,
uint32_t peer_number,
const uint8_t *data,
size_t length
) {
size_t curser = 0;
// - 1 byte (transfer_id)
uint8_t transfer_id;
_DATA_HAVE(sizeof(transfer_id), fprintf(stderr, "FT: packet too small, missing transfer_id\n"); return)
transfer_id = data[curser++];
auto& groups = ngc_ext_ctx->ngc_ft1_ctx->groups;
if (!groups.count(group_number)) {
fprintf(stderr, "FT: data_ack for unknown group\n");
return;
}
NGC_FT1::Group::Peer& peer = groups[group_number].peers[peer_number];
if (!peer.send_transfers[transfer_id].has_value()) {
fprintf(stderr, "FT: data_ack for unknown transfer\n");
return;
}
NGC_FT1::Group::Peer::SendTransfer& transfer = peer.send_transfers[transfer_id].value();
using State = NGC_FT1::Group::Peer::SendTransfer::State;
if (transfer.state != State::SENDING) {
fprintf(stderr, "FT: data_ack but not in SENDING state\n");
return;
}
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_DATA_HAVE(sizeof(uint16_t), fprintf(stderr, "FT: packet too small, atleast 1 seq_id\n"); return)
if ((length - curser) % sizeof(uint16_t) != 0) {
fprintf(stderr, "FT: data_ack with misaligned data\n");
return;
}
while (curser < length) {
uint16_t seq_id = data[curser++];
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seq_id |= data[curser++] << (1*8);
transfer.ssb.erase(seq_id);
}
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if (transfer.file_size == transfer.file_size_current) {
fprintf(stderr, "FT: %d done\n", transfer_id);
peer.send_transfers[transfer_id] = std::nullopt;
}
}
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#undef _DATA_HAVE