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diff --git a/protocols/Tox/libtox/src/toxcore/tox.api.h b/protocols/Tox/libtox/src/toxcore/tox.api.h new file mode 100644 index 0000000000..0763c7789d --- /dev/null +++ b/protocols/Tox/libtox/src/toxcore/tox.api.h @@ -0,0 +1,2583 @@ +%{ +/* + * The Tox public API. + */ + +/* + * Copyright © 2016-2017 The TokTok team. + * Copyright © 2013 Tox project. + * + * This file is part of Tox, the free peer to peer instant messenger. + * + * Tox 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 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. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef TOX_H +#define TOX_H + +#include <stdbool.h> +#include <stddef.h> +#include <stdint.h> + +#ifdef __cplusplus +extern "C" { +#endif +%} + + +/***************************************************************************** + * `tox.h` SHOULD *NOT* BE EDITED MANUALLY – any changes should be made to * + * `tox.api.h`, located in `toxcore/`. For instructions on how to * + * generate `tox.h` from `tox.api.h` please refer to `docs/apidsl.md` * + *****************************************************************************/ + + +/** \page core Public core API for Tox clients. + * + * Every function that can fail takes a function-specific error code pointer + * that can be used to diagnose problems with the Tox state or the function + * arguments. The error code pointer can be NULL, which does not influence the + * function's behaviour, but can be done if the reason for failure is irrelevant + * to the client. + * + * The exception to this rule are simple allocation functions whose only failure + * mode is allocation failure. They return NULL in that case, and do not set an + * error code. + * + * Every error code type has an OK value to which functions will set their error + * code value on success. Clients can keep their error code uninitialised before + * passing it to a function. The library guarantees that after returning, the + * value pointed to by the error code pointer has been initialised. + * + * Functions with pointer parameters often have a NULL error code, meaning they + * could not perform any operation, because one of the required parameters was + * NULL. Some functions operate correctly or are defined as effectless on NULL. + * + * Some functions additionally return a value outside their + * return type domain, or a bool containing true on success and false on + * failure. + * + * All functions that take a Tox instance pointer will cause undefined behaviour + * when passed a NULL Tox pointer. + * + * All integer values are expected in host byte order. + * + * Functions with parameters with enum types cause unspecified behaviour if the + * enumeration value is outside the valid range of the type. If possible, the + * function will try to use a sane default, but there will be no error code, + * and one possible action for the function to take is to have no effect. + * + * Integer constants and the memory layout of publicly exposed structs are not + * part of the ABI. + */ + +/** \subsection events Events and callbacks + * + * Events are handled by callbacks. One callback can be registered per event. + * All events have a callback function type named `tox_{event}_cb` and a + * function to register it named `tox_callback_{event}`. Passing a NULL + * callback will result in no callback being registered for that event. Only + * one callback per event can be registered, so if a client needs multiple + * event listeners, it needs to implement the dispatch functionality itself. + * + * The last argument to a callback is the user data pointer. It is passed from + * ${tox.iterate} to each callback in sequence. + * + * The user data pointer is never stored or dereferenced by any library code, so + * can be any pointer, including NULL. Callbacks must all operate on the same + * object type. In the apidsl code (tox.in.h), this is denoted with `any`. The + * `any` in ${tox.iterate} must be the same `any` as in all callbacks. In C, + * lacking parametric polymorphism, this is a pointer to void. + * + * Old style callbacks that are registered together with a user data pointer + * receive that pointer as argument when they are called. They can each have + * their own user data pointer of their own type. + */ + +/** \subsection threading Threading implications + * + * It is possible to run multiple concurrent threads with a Tox instance for + * each thread. It is also possible to run all Tox instances in the same thread. + * A common way to run Tox (multiple or single instance) is to have one thread + * running a simple ${tox.iterate} loop, sleeping for ${tox.iteration_interval} + * milliseconds on each iteration. + * + * If you want to access a single Tox instance from multiple threads, access + * to the instance must be synchronised. While multiple threads can concurrently + * access multiple different Tox instances, no more than one API function can + * operate on a single instance at any given time. + * + * Functions that write to variable length byte arrays will always have a size + * function associated with them. The result of this size function is only valid + * until another mutating function (one that takes a pointer to non-const Tox) + * is called. Thus, clients must ensure that no other thread calls a mutating + * function between the call to the size function and the call to the retrieval + * function. + * + * E.g. to get the current nickname, one would write + * + * \code + * size_t length = ${tox.self.name.size}(tox); + * uint8_t *name = malloc(length); + * if (!name) abort(); + * ${tox.self.name.get}(tox, name); + * \endcode + * + * If any other thread calls ${tox.self.name.set} while this thread is allocating + * memory, the length may have become invalid, and the call to + * ${tox.self.name.get} may cause undefined behaviour. + */ + +// The rest of this file is in class tox. +class tox { + +/** + * The Tox instance type. All the state associated with a connection is held + * within the instance. Multiple instances can exist and operate concurrently. + * The maximum number of Tox instances that can exist on a single network + * device is limited. Note that this is not just a per-process limit, since the + * limiting factor is the number of usable ports on a device. + */ +struct this; + + +/******************************************************************************* + * + * :: API version + * + ******************************************************************************/ + + +/** + * The major version number. Incremented when the API or ABI changes in an + * incompatible way. + * + * The function variants of these constants return the version number of the + * library. They can be used to display the Tox library version or to check + * whether the client is compatible with the dynamically linked version of Tox. + */ +const VERSION_MAJOR = 0; + +/** + * The minor version number. Incremented when functionality is added without + * breaking the API or ABI. Set to 0 when the major version number is + * incremented. + */ +const VERSION_MINOR = 1; + +/** + * The patch or revision number. Incremented when bugfixes are applied without + * changing any functionality or API or ABI. + */ +const VERSION_PATCH = 10; + +/** + * A macro to check at preprocessing time whether the client code is compatible + * with the installed version of Tox. Leading zeros in the version number are + * ignored. E.g. 0.1.5 is to 0.1.4 what 1.5 is to 1.4, that is: it can add new + * features, but can't break the API. + */ +#define TOX_VERSION_IS_API_COMPATIBLE(MAJOR, MINOR, PATCH) \ + (TOX_VERSION_MAJOR > 0 && TOX_VERSION_MAJOR == MAJOR) && ( \ + /* 1.x.x, 2.x.x, etc. with matching major version. */ \ + TOX_VERSION_MINOR > MINOR || \ + TOX_VERSION_MINOR == MINOR && TOX_VERSION_PATCH >= PATCH \ + ) || (TOX_VERSION_MAJOR == 0 && MAJOR == 0) && ( \ + /* 0.x.x makes minor behave like major above. */ \ + (TOX_VERSION_MINOR > 0 && TOX_VERSION_MINOR == MINOR) && ( \ + TOX_VERSION_PATCH >= PATCH \ + ) || (TOX_VERSION_MINOR == 0 && MINOR == 0) && ( \ + /* 0.0.x and 0.0.y are only compatible if x == y. */ \ + TOX_VERSION_PATCH == PATCH \ + ) \ + ) + +static namespace version { + + /** + * Return whether the compiled library version is compatible with the passed + * version numbers. + */ + bool is_compatible(uint32_t major, uint32_t minor, uint32_t patch); + +} + +/** + * A convenience macro to call tox_version_is_compatible with the currently + * compiling API version. + */ +#define TOX_VERSION_IS_ABI_COMPATIBLE() \ + tox_version_is_compatible(TOX_VERSION_MAJOR, TOX_VERSION_MINOR, TOX_VERSION_PATCH) + +/******************************************************************************* + * + * :: Numeric constants + * + * The values of these are not part of the ABI. Prefer to use the function + * versions of them for code that should remain compatible with future versions + * of toxcore. + * + ******************************************************************************/ + + +/** + * The size of a Tox Public Key in bytes. + */ +const PUBLIC_KEY_SIZE = 32; + +/** + * The size of a Tox Secret Key in bytes. + */ +const SECRET_KEY_SIZE = 32; + +/** + * The size of the nospam in bytes when written in a Tox address. + */ +const NOSPAM_SIZE = sizeof(uint32_t); + +/** + * The size of a Tox address in bytes. Tox addresses are in the format + * [Public Key ($PUBLIC_KEY_SIZE bytes)][nospam (4 bytes)][checksum (2 bytes)]. + * + * The checksum is computed over the Public Key and the nospam value. The first + * byte is an XOR of all the even bytes (0, 2, 4, ...), the second byte is an + * XOR of all the odd bytes (1, 3, 5, ...) of the Public Key and nospam. + */ +const ADDRESS_SIZE = PUBLIC_KEY_SIZE + NOSPAM_SIZE + sizeof(uint16_t); + +/** + * Maximum length of a nickname in bytes. + */ +const MAX_NAME_LENGTH = 128; + +/** + * Maximum length of a status message in bytes. + */ +const MAX_STATUS_MESSAGE_LENGTH = 1007; + +/** + * Maximum length of a friend request message in bytes. + */ +const MAX_FRIEND_REQUEST_LENGTH = 1016; + +/** + * Maximum length of a single message after which it should be split. + */ +const MAX_MESSAGE_LENGTH = 1372; + +/** + * Maximum size of custom packets. TODO(iphydf): should be LENGTH? + */ +const MAX_CUSTOM_PACKET_SIZE = 1373; + +/** + * The number of bytes in a hash generated by $hash. + */ +const HASH_LENGTH = 32; + +/** + * The number of bytes in a file id. + */ +const FILE_ID_LENGTH = 32; + +/** + * Maximum file name length for file transfers. + */ +const MAX_FILENAME_LENGTH = 255; + + +/******************************************************************************* + * + * :: Global enumerations + * + ******************************************************************************/ + + +/** + * Represents the possible statuses a client can have. + */ +enum class USER_STATUS { + /** + * User is online and available. + */ + NONE, + /** + * User is away. Clients can set this e.g. after a user defined + * inactivity time. + */ + AWAY, + /** + * User is busy. Signals to other clients that this client does not + * currently wish to communicate. + */ + BUSY, +} + + +/** + * Represents message types for ${tox.friend.send.message} and conference + * messages. + */ +enum class MESSAGE_TYPE { + /** + * Normal text message. Similar to PRIVMSG on IRC. + */ + NORMAL, + /** + * A message describing an user action. This is similar to /me (CTCP ACTION) + * on IRC. + */ + ACTION, +} + + +/******************************************************************************* + * + * :: Startup options + * + ******************************************************************************/ + + +/** + * Type of proxy used to connect to TCP relays. + */ +enum class PROXY_TYPE { + /** + * Don't use a proxy. + */ + NONE, + /** + * HTTP proxy using CONNECT. + */ + HTTP, + /** + * SOCKS proxy for simple socket pipes. + */ + SOCKS5, +} + +/** + * Type of savedata to create the Tox instance from. + */ +enum class SAVEDATA_TYPE { + /** + * No savedata. + */ + NONE, + /** + * Savedata is one that was obtained from ${savedata.get}. + */ + TOX_SAVE, + /** + * Savedata is a secret key of length $SECRET_KEY_SIZE. + */ + SECRET_KEY, +} + + +/** + * Severity level of log messages. + */ +enum class LOG_LEVEL { + /** + * Very detailed traces including all network activity. + */ + TRACE, + /** + * Debug messages such as which port we bind to. + */ + DEBUG, + /** + * Informational log messages such as video call status changes. + */ + INFO, + /** + * Warnings about internal inconsistency or logic errors. + */ + WARNING, + /** + * Severe unexpected errors caused by external or internal inconsistency. + */ + ERROR, +} + +/** + * This event is triggered when the toxcore library logs an internal message. + * This is mostly useful for debugging. This callback can be called from any + * function, not just $iterate. This means the user data lifetime must at + * least extend between registering and unregistering it or $kill. + * + * Other toxcore modules such as toxav may concurrently call this callback at + * any time. Thus, user code must make sure it is equipped to handle concurrent + * execution, e.g. by employing appropriate mutex locking. + * + * @param level The severity of the log message. + * @param file The source file from which the message originated. + * @param line The source line from which the message originated. + * @param func The function from which the message originated. + * @param message The log message. + * @param user_data The user data pointer passed to $new in options. + */ +typedef void log_cb(LOG_LEVEL level, string file, uint32_t line, string func, string message, any user_data); + + +static class options { + /** + * This struct contains all the startup options for Tox. You must $new to + * allocate an object of this type. + * + * WARNING: Although this struct happens to be visible in the API, it is + * effectively private. Do not allocate this yourself or access members + * directly, as it *will* break binary compatibility frequently. + * + * @deprecated The memory layout of this struct (size, alignment, and field + * order) is not part of the ABI. To remain compatible, prefer to use $new to + * allocate the object and accessor functions to set the members. The struct + * will become opaque (i.e. the definition will become private) in v0.2.0. + */ + struct this [get, set] { + /** + * The type of socket to create. + * + * If this is set to false, an IPv4 socket is created, which subsequently + * only allows IPv4 communication. + * If it is set to true, an IPv6 socket is created, allowing both IPv4 and + * IPv6 communication. + */ + bool ipv6_enabled; + + /** + * Enable the use of UDP communication when available. + * + * Setting this to false will force Tox to use TCP only. Communications will + * need to be relayed through a TCP relay node, potentially slowing them down. + * Disabling UDP support is necessary when using anonymous proxies or Tor. + */ + bool udp_enabled; + + /** + * Enable local network peer discovery. + * + * Disabling this will cause Tox to not look for peers on the local network. + */ + bool local_discovery_enabled; + + namespace proxy { + /** + * Pass communications through a proxy. + */ + PROXY_TYPE type; + + /** + * The IP address or DNS name of the proxy to be used. + * + * If used, this must be non-NULL and be a valid DNS name. The name must not + * exceed 255 characters, and be in a NUL-terminated C string format + * (255 chars + 1 NUL byte). + * + * This member is ignored (it can be NULL) if proxy_type is ${PROXY_TYPE.NONE}. + * + * The data pointed at by this member is owned by the user, so must + * outlive the options object. + */ + string host; + + /** + * The port to use to connect to the proxy server. + * + * Ports must be in the range (1, 65535). The value is ignored if + * proxy_type is ${PROXY_TYPE.NONE}. + */ + uint16_t port; + } + + /** + * The start port of the inclusive port range to attempt to use. + * + * If both start_port and end_port are 0, the default port range will be + * used: [33445, 33545]. + * + * If either start_port or end_port is 0 while the other is non-zero, the + * non-zero port will be the only port in the range. + * + * Having start_port > end_port will yield the same behavior as if start_port + * and end_port were swapped. + */ + uint16_t start_port; + + /** + * The end port of the inclusive port range to attempt to use. + */ + uint16_t end_port; + + /** + * The port to use for the TCP server (relay). If 0, the TCP server is + * disabled. + * + * Enabling it is not required for Tox to function properly. + * + * When enabled, your Tox instance can act as a TCP relay for other Tox + * instance. This leads to increased traffic, thus when writing a client + * it is recommended to enable TCP server only if the user has an option + * to disable it. + */ + uint16_t tcp_port; + + /** + * Enables or disables UDP hole-punching in toxcore. (Default: enabled). + */ + bool hole_punching_enabled; + + namespace savedata { + /** + * The type of savedata to load from. + */ + SAVEDATA_TYPE type; + + /** + * The savedata. + * + * The data pointed at by this member is owned by the user, so must + * outlive the options object. + */ + const uint8_t[length] data; + + /** + * The length of the savedata. + */ + size_t length; + } + + namespace log { + /** + * Logging callback for the new tox instance. + */ + log_cb *callback; + + /** + * User data pointer passed to the logging callback. + */ + any user_data; + } + } + + + /** + * Initialises a $this object with the default options. + * + * The result of this function is independent of the original options. All + * values will be overwritten, no values will be read (so it is permissible + * to pass an uninitialised object). + * + * If options is NULL, this function has no effect. + * + * @param options An options object to be filled with default options. + */ + void default(); + + + /** + * Allocates a new $this object and initialises it with the default + * options. This function can be used to preserve long term ABI compatibility by + * giving the responsibility of allocation and deallocation to the Tox library. + * + * Objects returned from this function must be freed using the $free + * function. + * + * @return A new $this object with default options or NULL on failure. + */ + static this new() { + /** + * The function failed to allocate enough memory for the options struct. + */ + MALLOC, + } + + + /** + * Releases all resources associated with an options objects. + * + * Passing a pointer that was not returned by $new results in + * undefined behaviour. + */ + void free(); +} + + +/******************************************************************************* + * + * :: Creation and destruction + * + ******************************************************************************/ + + +/** + * @brief Creates and initialises a new Tox instance with the options passed. + * + * This function will bring the instance into a valid state. Running the event + * loop with a new instance will operate correctly. + * + * If loading failed or succeeded only partially, the new or partially loaded + * instance is returned and an error code is set. + * + * @param options An options object as described above. If this parameter is + * NULL, the default options are used. + * + * @see $iterate for the event loop. + * + * @return A new Tox instance pointer on success or NULL on failure. + */ +static this new(const options_t *options) { + NULL, + /** + * The function was unable to allocate enough memory to store the internal + * structures for the Tox object. + */ + MALLOC, + /** + * The function was unable to bind to a port. This may mean that all ports + * have already been bound, e.g. by other Tox instances, or it may mean + * a permission error. You may be able to gather more information from errno. + */ + PORT_ALLOC, + + namespace PROXY { + /** + * proxy_type was invalid. + */ + BAD_TYPE, + /** + * proxy_type was valid but the proxy_host passed had an invalid format + * or was NULL. + */ + BAD_HOST, + /** + * proxy_type was valid, but the proxy_port was invalid. + */ + BAD_PORT, + /** + * The proxy address passed could not be resolved. + */ + NOT_FOUND, + } + + namespace LOAD { + /** + * The byte array to be loaded contained an encrypted save. + */ + ENCRYPTED, + /** + * The data format was invalid. This can happen when loading data that was + * saved by an older version of Tox, or when the data has been corrupted. + * When loading from badly formatted data, some data may have been loaded, + * and the rest is discarded. Passing an invalid length parameter also + * causes this error. + */ + BAD_FORMAT, + } +} + + +/** + * Releases all resources associated with the Tox instance and disconnects from + * the network. + * + * After calling this function, the Tox pointer becomes invalid. No other + * functions can be called, and the pointer value can no longer be read. + */ +void kill(); + + +uint8_t[size] savedata { + /** + * Calculates the number of bytes required to store the tox instance with + * $get. This function cannot fail. The result is always greater than 0. + * + * @see threading for concurrency implications. + */ + size(); + + /** + * Store all information associated with the tox instance to a byte array. + * + * @param savedata A memory region large enough to store the tox instance + * data. Call $size to find the number of bytes required. If this parameter + * is NULL, this function has no effect. + */ + get(); +} + + +/******************************************************************************* + * + * :: Connection lifecycle and event loop + * + ******************************************************************************/ + + +/** + * Sends a "get nodes" request to the given bootstrap node with IP, port, and + * public key to setup connections. + * + * This function will attempt to connect to the node using UDP. You must use + * this function even if ${options.this.udp_enabled} was set to false. + * + * @param address The hostname or IP address (IPv4 or IPv6) of the node. + * @param port The port on the host on which the bootstrap Tox instance is + * listening. + * @param public_key The long term public key of the bootstrap node + * ($PUBLIC_KEY_SIZE bytes). + * @return true on success. + */ +bool bootstrap(string address, uint16_t port, const uint8_t[PUBLIC_KEY_SIZE] public_key) { + NULL, + /** + * The address could not be resolved to an IP address, or the IP address + * passed was invalid. + */ + BAD_HOST, + /** + * The port passed was invalid. The valid port range is (1, 65535). + */ + BAD_PORT, +} + + +/** + * Adds additional host:port pair as TCP relay. + * + * This function can be used to initiate TCP connections to different ports on + * the same bootstrap node, or to add TCP relays without using them as + * bootstrap nodes. + * + * @param address The hostname or IP address (IPv4 or IPv6) of the TCP relay. + * @param port The port on the host on which the TCP relay is listening. + * @param public_key The long term public key of the TCP relay + * ($PUBLIC_KEY_SIZE bytes). + * @return true on success. + */ +bool add_tcp_relay(string address, uint16_t port, const uint8_t[PUBLIC_KEY_SIZE] public_key) + with error for bootstrap; + + +/** + * Protocols that can be used to connect to the network or friends. + */ +enum class CONNECTION { + /** + * There is no connection. This instance, or the friend the state change is + * about, is now offline. + */ + NONE, + /** + * A TCP connection has been established. For the own instance, this means it + * is connected through a TCP relay, only. For a friend, this means that the + * connection to that particular friend goes through a TCP relay. + */ + TCP, + /** + * A UDP connection has been established. For the own instance, this means it + * is able to send UDP packets to DHT nodes, but may still be connected to + * a TCP relay. For a friend, this means that the connection to that + * particular friend was built using direct UDP packets. + */ + UDP, +} + + +inline namespace self { + + CONNECTION connection_status { + /** + * Return whether we are connected to the DHT. The return value is equal to the + * last value received through the `${event connection_status}` callback. + */ + get(); + } + + + /** + * This event is triggered whenever there is a change in the DHT connection + * state. When disconnected, a client may choose to call $bootstrap again, to + * reconnect to the DHT. Note that this state may frequently change for short + * amounts of time. Clients should therefore not immediately bootstrap on + * receiving a disconnect. + * + * TODO(iphydf): how long should a client wait before bootstrapping again? + */ + event connection_status const { + /** + * @param connection_status Whether we are connected to the DHT. + */ + typedef void(CONNECTION connection_status); + } + +} + + +/** + * Return the time in milliseconds before $iterate() should be called again + * for optimal performance. + */ +const uint32_t iteration_interval(); + + +/** + * The main loop that needs to be run in intervals of $iteration_interval() + * milliseconds. + */ +void iterate(any user_data); + + +/******************************************************************************* + * + * :: Internal client information (Tox address/id) + * + ******************************************************************************/ + + +inline namespace self { + + uint8_t[ADDRESS_SIZE] address { + /** + * Writes the Tox friend address of the client to a byte array. The address is + * not in human-readable format. If a client wants to display the address, + * formatting is required. + * + * @param address A memory region of at least $ADDRESS_SIZE bytes. If this + * parameter is NULL, this function has no effect. + * @see $ADDRESS_SIZE for the address format. + */ + get(); + } + + + uint32_t nospam { + /** + * Set the 4-byte nospam part of the address. This value is expected in host + * byte order. I.e. 0x12345678 will form the bytes [12, 34, 56, 78] in the + * nospam part of the Tox friend address. + * + * @param nospam Any 32 bit unsigned integer. + */ + set(); + + /** + * Get the 4-byte nospam part of the address. This value is returned in host + * byte order. + */ + get(); + } + + + uint8_t[PUBLIC_KEY_SIZE] public_key { + /** + * Copy the Tox Public Key (long term) from the Tox object. + * + * @param public_key A memory region of at least $PUBLIC_KEY_SIZE bytes. If + * this parameter is NULL, this function has no effect. + */ + get(); + } + + + uint8_t[SECRET_KEY_SIZE] secret_key { + /** + * Copy the Tox Secret Key from the Tox object. + * + * @param secret_key A memory region of at least $SECRET_KEY_SIZE bytes. If + * this parameter is NULL, this function has no effect. + */ + get(); + } + +} + + +/******************************************************************************* + * + * :: User-visible client information (nickname/status) + * + ******************************************************************************/ + + +/** + * Common error codes for all functions that set a piece of user-visible + * client information. + */ +error for set_info { + NULL, + /** + * Information length exceeded maximum permissible size. + */ + TOO_LONG, +} + + +inline namespace self { + + uint8_t[length <= MAX_NAME_LENGTH] name { + /** + * Set the nickname for the Tox client. + * + * Nickname length cannot exceed $MAX_NAME_LENGTH. If length is 0, the name + * parameter is ignored (it can be NULL), and the nickname is set back to empty. + * + * @param name A byte array containing the new nickname. + * @param length The size of the name byte array. + * + * @return true on success. + */ + set() with error for set_info; + + /** + * Return the length of the current nickname as passed to $set. + * + * If no nickname was set before calling this function, the name is empty, + * and this function returns 0. + * + * @see threading for concurrency implications. + */ + size(); + + /** + * Write the nickname set by $set to a byte array. + * + * If no nickname was set before calling this function, the name is empty, + * and this function has no effect. + * + * Call $size to find out how much memory to allocate for + * the result. + * + * @param name A valid memory location large enough to hold the nickname. + * If this parameter is NULL, the function has no effect. + */ + get(); + } + + + uint8_t[length <= MAX_STATUS_MESSAGE_LENGTH] status_message { + /** + * Set the client's status message. + * + * Status message length cannot exceed $MAX_STATUS_MESSAGE_LENGTH. If + * length is 0, the status parameter is ignored (it can be NULL), and the + * user status is set back to empty. + */ + set() with error for set_info; + + /** + * Return the length of the current status message as passed to $set. + * + * If no status message was set before calling this function, the status + * is empty, and this function returns 0. + * + * @see threading for concurrency implications. + */ + size(); + + /** + * Write the status message set by $set to a byte array. + * + * If no status message was set before calling this function, the status is + * empty, and this function has no effect. + * + * Call $size to find out how much memory to allocate for + * the result. + * + * @param status_message A valid memory location large enough to hold the + * status message. If this parameter is NULL, the function has no effect. + */ + get(); + } + + + USER_STATUS status { + /** + * Set the client's user status. + * + * @param status One of the user statuses listed in the enumeration above. + */ + set(); + + /** + * Returns the client's user status. + */ + get(); + } + +} + + +/******************************************************************************* + * + * :: Friend list management + * + ******************************************************************************/ + + +namespace friend { + + /** + * Add a friend to the friend list and send a friend request. + * + * A friend request message must be at least 1 byte long and at most + * $MAX_FRIEND_REQUEST_LENGTH. + * + * Friend numbers are unique identifiers used in all functions that operate on + * friends. Once added, a friend number is stable for the lifetime of the Tox + * object. After saving the state and reloading it, the friend numbers may not + * be the same as before. Deleting a friend creates a gap in the friend number + * set, which is filled by the next adding of a friend. Any pattern in friend + * numbers should not be relied on. + * + * If more than INT32_MAX friends are added, this function causes undefined + * behaviour. + * + * @param address The address of the friend (returned by ${self.address.get} of + * the friend you wish to add) it must be $ADDRESS_SIZE bytes. + * @param message The message that will be sent along with the friend request. + * @param length The length of the data byte array. + * + * @return the friend number on success, UINT32_MAX on failure. + */ + uint32_t add( + const uint8_t[ADDRESS_SIZE] address, + const uint8_t[length <= MAX_FRIEND_REQUEST_LENGTH] message + ) { + NULL, + /** + * The length of the friend request message exceeded + * $MAX_FRIEND_REQUEST_LENGTH. + */ + TOO_LONG, + /** + * The friend request message was empty. This, and the TOO_LONG code will + * never be returned from $add_norequest. + */ + NO_MESSAGE, + /** + * The friend address belongs to the sending client. + */ + OWN_KEY, + /** + * A friend request has already been sent, or the address belongs to a friend + * that is already on the friend list. + */ + ALREADY_SENT, + /** + * The friend address checksum failed. + */ + BAD_CHECKSUM, + /** + * The friend was already there, but the nospam value was different. + */ + SET_NEW_NOSPAM, + /** + * A memory allocation failed when trying to increase the friend list size. + */ + MALLOC, + } + + + /** + * Add a friend without sending a friend request. + * + * This function is used to add a friend in response to a friend request. If the + * client receives a friend request, it can be reasonably sure that the other + * client added this client as a friend, eliminating the need for a friend + * request. + * + * This function is also useful in a situation where both instances are + * controlled by the same entity, so that this entity can perform the mutual + * friend adding. In this case, there is no need for a friend request, either. + * + * @param public_key A byte array of length $PUBLIC_KEY_SIZE containing the + * Public Key (not the Address) of the friend to add. + * + * @return the friend number on success, UINT32_MAX on failure. + * @see $add for a more detailed description of friend numbers. + */ + uint32_t add_norequest(const uint8_t[PUBLIC_KEY_SIZE] public_key) + with error for add; + + + /** + * Remove a friend from the friend list. + * + * This does not notify the friend of their deletion. After calling this + * function, this client will appear offline to the friend and no communication + * can occur between the two. + * + * @param friend_number Friend number for the friend to be deleted. + * + * @return true on success. + */ + bool delete(uint32_t friend_number) { + /** + * There was no friend with the given friend number. No friends were deleted. + */ + FRIEND_NOT_FOUND, + } + +} + + +/******************************************************************************* + * + * :: Friend list queries + * + ******************************************************************************/ + +namespace friend { + + /** + * Return the friend number associated with that Public Key. + * + * @return the friend number on success, UINT32_MAX on failure. + * @param public_key A byte array containing the Public Key. + */ + const uint32_t by_public_key(const uint8_t[PUBLIC_KEY_SIZE] public_key) { + NULL, + /** + * No friend with the given Public Key exists on the friend list. + */ + NOT_FOUND, + } + + + /** + * Checks if a friend with the given friend number exists and returns true if + * it does. + */ + const bool exists(uint32_t friend_number); + +} + +inline namespace self { + + uint32_t[size] friend_list { + /** + * Return the number of friends on the friend list. + * + * This function can be used to determine how much memory to allocate for + * $get. + */ + size(); + + + /** + * Copy a list of valid friend numbers into an array. + * + * Call $size to determine the number of elements to allocate. + * + * @param friend_list A memory region with enough space to hold the friend + * list. If this parameter is NULL, this function has no effect. + */ + get(); + } + +} + + + +namespace friend { + + uint8_t[PUBLIC_KEY_SIZE] public_key { + /** + * Copies the Public Key associated with a given friend number to a byte array. + * + * @param friend_number The friend number you want the Public Key of. + * @param public_key A memory region of at least $PUBLIC_KEY_SIZE bytes. If + * this parameter is NULL, this function has no effect. + * + * @return true on success. + */ + get(uint32_t friend_number) { + /** + * No friend with the given number exists on the friend list. + */ + FRIEND_NOT_FOUND, + } + } + +} + +namespace friend { + + uint64_t last_online { + /** + * Return a unix-time timestamp of the last time the friend associated with a given + * friend number was seen online. This function will return UINT64_MAX on error. + * + * @param friend_number The friend number you want to query. + */ + get(uint32_t friend_number) { + /** + * No friend with the given number exists on the friend list. + */ + FRIEND_NOT_FOUND, + } + } + +} + +/******************************************************************************* + * + * :: Friend-specific state queries (can also be received through callbacks) + * + ******************************************************************************/ + + +namespace friend { + + /** + * Common error codes for friend state query functions. + */ + error for query { + /** + * The pointer parameter for storing the query result (name, message) was + * NULL. Unlike the `_self_` variants of these functions, which have no effect + * when a parameter is NULL, these functions return an error in that case. + */ + NULL, + /** + * The friend_number did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + } + + + uint8_t[length <= MAX_NAME_LENGTH] name { + /** + * Return the length of the friend's name. If the friend number is invalid, the + * return value is unspecified. + * + * The return value is equal to the `length` argument received by the last + * `${event name}` callback. + */ + size(uint32_t friend_number) + with error for query; + + /** + * Write the name of the friend designated by the given friend number to a byte + * array. + * + * Call $size to determine the allocation size for the `name` + * parameter. + * + * The data written to `name` is equal to the data received by the last + * `${event name}` callback. + * + * @param name A valid memory region large enough to store the friend's name. + * + * @return true on success. + */ + get(uint32_t friend_number) + with error for query; + } + + + /** + * This event is triggered when a friend changes their name. + */ + event name const { + /** + * @param friend_number The friend number of the friend whose name changed. + * @param name A byte array containing the same data as + * ${name.get} would write to its `name` parameter. + * @param length A value equal to the return value of + * ${name.size}. + */ + typedef void(uint32_t friend_number, const uint8_t[length <= MAX_NAME_LENGTH] name); + } + + + uint8_t[length <= MAX_STATUS_MESSAGE_LENGTH] status_message { + /** + * Return the length of the friend's status message. If the friend number is + * invalid, the return value is SIZE_MAX. + */ + size(uint32_t friend_number) + with error for query; + + /** + * Write the status message of the friend designated by the given friend number to a byte + * array. + * + * Call $size to determine the allocation size for the `status_name` + * parameter. + * + * The data written to `status_message` is equal to the data received by the last + * `${event status_message}` callback. + * + * @param status_message A valid memory region large enough to store the friend's status message. + */ + get(uint32_t friend_number) + with error for query; + } + + + /** + * This event is triggered when a friend changes their status message. + */ + event status_message const { + /** + * @param friend_number The friend number of the friend whose status message + * changed. + * @param message A byte array containing the same data as + * ${status_message.get} would write to its `status_message` parameter. + * @param length A value equal to the return value of + * ${status_message.size}. + */ + typedef void(uint32_t friend_number, const uint8_t[length <= MAX_STATUS_MESSAGE_LENGTH] message); + } + + + USER_STATUS status { + /** + * Return the friend's user status (away/busy/...). If the friend number is + * invalid, the return value is unspecified. + * + * The status returned is equal to the last status received through the + * `${event status}` callback. + */ + get(uint32_t friend_number) + with error for query; + } + + + /** + * This event is triggered when a friend changes their user status. + */ + event status const { + /** + * @param friend_number The friend number of the friend whose user status + * changed. + * @param status The new user status. + */ + typedef void(uint32_t friend_number, USER_STATUS status); + } + + + CONNECTION connection_status { + /** + * Check whether a friend is currently connected to this client. + * + * The result of this function is equal to the last value received by the + * `${event connection_status}` callback. + * + * @param friend_number The friend number for which to query the connection + * status. + * + * @return the friend's connection status as it was received through the + * `${event connection_status}` event. + */ + get(uint32_t friend_number) + with error for query; + } + + + /** + * This event is triggered when a friend goes offline after having been online, + * or when a friend goes online. + * + * This callback is not called when adding friends. It is assumed that when + * adding friends, their connection status is initially offline. + */ + event connection_status const { + /** + * @param friend_number The friend number of the friend whose connection status + * changed. + * @param connection_status The result of calling + * ${connection_status.get} on the passed friend_number. + */ + typedef void(uint32_t friend_number, CONNECTION connection_status); + } + + + bool typing { + /** + * Check whether a friend is currently typing a message. + * + * @param friend_number The friend number for which to query the typing status. + * + * @return true if the friend is typing. + * @return false if the friend is not typing, or the friend number was + * invalid. Inspect the error code to determine which case it is. + */ + get(uint32_t friend_number) + with error for query; + } + + + /** + * This event is triggered when a friend starts or stops typing. + */ + event typing const { + /** + * @param friend_number The friend number of the friend who started or stopped + * typing. + * @param is_typing The result of calling ${typing.get} on the passed + * friend_number. + */ + typedef void(uint32_t friend_number, bool is_typing); + } + +} + + +/******************************************************************************* + * + * :: Sending private messages + * + ******************************************************************************/ + + +inline namespace self { + + bool typing { + /** + * Set the client's typing status for a friend. + * + * The client is responsible for turning it on or off. + * + * @param friend_number The friend to which the client is typing a message. + * @param typing The typing status. True means the client is typing. + * + * @return true on success. + */ + set(uint32_t friend_number) { + /** + * The friend number did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + } + } + +} + + +namespace friend { + + namespace send { + + /** + * Send a text chat message to an online friend. + * + * This function creates a chat message packet and pushes it into the send + * queue. + * + * The message length may not exceed $MAX_MESSAGE_LENGTH. Larger messages + * must be split by the client and sent as separate messages. Other clients can + * then reassemble the fragments. Messages may not be empty. + * + * The return value of this function is the message ID. If a read receipt is + * received, the triggered `${event read_receipt}` event will be passed this message ID. + * + * Message IDs are unique per friend. The first message ID is 0. Message IDs are + * incremented by 1 each time a message is sent. If UINT32_MAX messages were + * sent, the next message ID is 0. + * + * @param type Message type (normal, action, ...). + * @param friend_number The friend number of the friend to send the message to. + * @param message A non-NULL pointer to the first element of a byte array + * containing the message text. + * @param length Length of the message to be sent. + */ + uint32_t message(uint32_t friend_number, MESSAGE_TYPE type, + const uint8_t[length <= MAX_MESSAGE_LENGTH] message) { + NULL, + /** + * The friend number did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + /** + * This client is currently not connected to the friend. + */ + FRIEND_NOT_CONNECTED, + /** + * An allocation error occurred while increasing the send queue size. + */ + SENDQ, + /** + * Message length exceeded $MAX_MESSAGE_LENGTH. + */ + TOO_LONG, + /** + * Attempted to send a zero-length message. + */ + EMPTY, + } + + } + + + /** + * This event is triggered when the friend receives the message sent with + * ${send.message} with the corresponding message ID. + */ + event read_receipt const { + /** + * @param friend_number The friend number of the friend who received the message. + * @param message_id The message ID as returned from ${send.message} + * corresponding to the message sent. + */ + typedef void(uint32_t friend_number, uint32_t message_id); + } + +} + + +/******************************************************************************* + * + * :: Receiving private messages and friend requests + * + ******************************************************************************/ + + +namespace friend { + + /** + * This event is triggered when a friend request is received. + */ + event request const { + /** + * @param public_key The Public Key of the user who sent the friend request. + * @param message The message they sent along with the request. + * @param length The size of the message byte array. + */ + typedef void(const uint8_t[PUBLIC_KEY_SIZE] public_key, + const uint8_t[length <= MAX_MESSAGE_LENGTH] message); + } + + + /** + * This event is triggered when a message from a friend is received. + */ + event message const { + /** + * @param friend_number The friend number of the friend who sent the message. + * @param message The message data they sent. + * @param length The size of the message byte array. + */ + typedef void(uint32_t friend_number, MESSAGE_TYPE type, + const uint8_t[length <= MAX_MESSAGE_LENGTH] message); + } + +} + + +/******************************************************************************* + * + * :: File transmission: common between sending and receiving + * + ******************************************************************************/ + + +/** + * Generates a cryptographic hash of the given data. + * + * This function may be used by clients for any purpose, but is provided + * primarily for validating cached avatars. This use is highly recommended to + * avoid unnecessary avatar updates. + * + * If hash is NULL or data is NULL while length is not 0 the function returns false, + * otherwise it returns true. + * + * This function is a wrapper to internal message-digest functions. + * + * @param hash A valid memory location the hash data. It must be at least + * $HASH_LENGTH bytes in size. + * @param data Data to be hashed or NULL. + * @param length Size of the data array or 0. + * + * @return true if hash was not NULL. + */ +static bool hash(uint8_t[HASH_LENGTH] hash, const uint8_t[length] data); + + +namespace file { + + enum KIND { + /** + * Arbitrary file data. Clients can choose to handle it based on the file name + * or magic or any other way they choose. + */ + DATA, + /** + * Avatar file_id. This consists of $hash(image). + * Avatar data. This consists of the image data. + * + * Avatars can be sent at any time the client wishes. Generally, a client will + * send the avatar to a friend when that friend comes online, and to all + * friends when the avatar changed. A client can save some traffic by + * remembering which friend received the updated avatar already and only send + * it if the friend has an out of date avatar. + * + * Clients who receive avatar send requests can reject it (by sending + * ${CONTROL.CANCEL} before any other controls), or accept it (by + * sending ${CONTROL.RESUME}). The file_id of length $HASH_LENGTH bytes + * (same length as $FILE_ID_LENGTH) will contain the hash. A client can compare + * this hash with a saved hash and send ${CONTROL.CANCEL} to terminate the avatar + * transfer if it matches. + * + * When file_size is set to 0 in the transfer request it means that the client + * has no avatar. + */ + AVATAR, + } + + + enum class CONTROL { + /** + * Sent by the receiving side to accept a file send request. Also sent after a + * $PAUSE command to continue sending or receiving. + */ + RESUME, + /** + * Sent by clients to pause the file transfer. The initial state of a file + * transfer is always paused on the receiving side and running on the sending + * side. If both the sending and receiving side pause the transfer, then both + * need to send $RESUME for the transfer to resume. + */ + PAUSE, + /** + * Sent by the receiving side to reject a file send request before any other + * commands are sent. Also sent by either side to terminate a file transfer. + */ + CANCEL, + } + + + /** + * Sends a file control command to a friend for a given file transfer. + * + * @param friend_number The friend number of the friend the file is being + * transferred to or received from. + * @param file_number The friend-specific identifier for the file transfer. + * @param control The control command to send. + * + * @return true on success. + */ + bool control(uint32_t friend_number, uint32_t file_number, CONTROL control) { + /** + * The friend_number passed did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + /** + * This client is currently not connected to the friend. + */ + FRIEND_NOT_CONNECTED, + /** + * No file transfer with the given file number was found for the given friend. + */ + NOT_FOUND, + /** + * A RESUME control was sent, but the file transfer is running normally. + */ + NOT_PAUSED, + /** + * A RESUME control was sent, but the file transfer was paused by the other + * party. Only the party that paused the transfer can resume it. + */ + DENIED, + /** + * A PAUSE control was sent, but the file transfer was already paused. + */ + ALREADY_PAUSED, + /** + * Packet queue is full. + */ + SENDQ, + } + + + /** + * This event is triggered when a file control command is received from a + * friend. + */ + event recv_control const { + /** + * When receiving ${CONTROL.CANCEL}, the client should release the + * resources associated with the file number and consider the transfer failed. + * + * @param friend_number The friend number of the friend who is sending the file. + * @param file_number The friend-specific file number the data received is + * associated with. + * @param control The file control command received. + */ + typedef void(uint32_t friend_number, uint32_t file_number, CONTROL control); + } + + /** + * Sends a file seek control command to a friend for a given file transfer. + * + * This function can only be called to resume a file transfer right before + * ${CONTROL.RESUME} is sent. + * + * @param friend_number The friend number of the friend the file is being + * received from. + * @param file_number The friend-specific identifier for the file transfer. + * @param position The position that the file should be seeked to. + */ + bool seek(uint32_t friend_number, uint32_t file_number, uint64_t position) { + /** + * The friend_number passed did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + /** + * This client is currently not connected to the friend. + */ + FRIEND_NOT_CONNECTED, + /** + * No file transfer with the given file number was found for the given friend. + */ + NOT_FOUND, + /** + * File was not in a state where it could be seeked. + */ + DENIED, + /** + * Seek position was invalid + */ + INVALID_POSITION, + /** + * Packet queue is full. + */ + SENDQ, + } + + + error for get { + NULL, + /** + * The friend_number passed did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + /** + * No file transfer with the given file number was found for the given friend. + */ + NOT_FOUND, + } + + uint8_t[FILE_ID_LENGTH] file_id { + /** + * Copy the file id associated to the file transfer to a byte array. + * + * @param friend_number The friend number of the friend the file is being + * transferred to or received from. + * @param file_number The friend-specific identifier for the file transfer. + * @param file_id A memory region of at least $FILE_ID_LENGTH bytes. If + * this parameter is NULL, this function has no effect. + * + * @return true on success. + */ + get(uint32_t friend_number, uint32_t file_number) + with error for get; + } + +} + + +/******************************************************************************* + * + * :: File transmission: sending + * + ******************************************************************************/ + + +namespace file { + + /** + * Send a file transmission request. + * + * Maximum filename length is $MAX_FILENAME_LENGTH bytes. The filename + * should generally just be a file name, not a path with directory names. + * + * If a non-UINT64_MAX file size is provided, it can be used by both sides to + * determine the sending progress. File size can be set to UINT64_MAX for streaming + * data of unknown size. + * + * File transmission occurs in chunks, which are requested through the + * `${event chunk_request}` event. + * + * When a friend goes offline, all file transfers associated with the friend are + * purged from core. + * + * If the file contents change during a transfer, the behaviour is unspecified + * in general. What will actually happen depends on the mode in which the file + * was modified and how the client determines the file size. + * + * - If the file size was increased + * - and sending mode was streaming (file_size = UINT64_MAX), the behaviour + * will be as expected. + * - and sending mode was file (file_size != UINT64_MAX), the + * ${event chunk_request} callback will receive length = 0 when Core thinks + * the file transfer has finished. If the client remembers the file size as + * it was when sending the request, it will terminate the transfer normally. + * If the client re-reads the size, it will think the friend cancelled the + * transfer. + * - If the file size was decreased + * - and sending mode was streaming, the behaviour is as expected. + * - and sending mode was file, the callback will return 0 at the new + * (earlier) end-of-file, signalling to the friend that the transfer was + * cancelled. + * - If the file contents were modified + * - at a position before the current read, the two files (local and remote) + * will differ after the transfer terminates. + * - at a position after the current read, the file transfer will succeed as + * expected. + * - In either case, both sides will regard the transfer as complete and + * successful. + * + * @param friend_number The friend number of the friend the file send request + * should be sent to. + * @param kind The meaning of the file to be sent. + * @param file_size Size in bytes of the file the client wants to send, UINT64_MAX if + * unknown or streaming. + * @param file_id A file identifier of length $FILE_ID_LENGTH that can be used to + * uniquely identify file transfers across core restarts. If NULL, a random one will + * be generated by core. It can then be obtained by using ${file_id.get}(). + * @param filename Name of the file. Does not need to be the actual name. This + * name will be sent along with the file send request. + * @param filename_length Size in bytes of the filename. + * + * @return A file number used as an identifier in subsequent callbacks. This + * number is per friend. File numbers are reused after a transfer terminates. + * On failure, this function returns UINT32_MAX. Any pattern in file numbers + * should not be relied on. + */ + uint32_t send(uint32_t friend_number, uint32_t kind, uint64_t file_size, + const uint8_t[FILE_ID_LENGTH] file_id, + const uint8_t[filename_length <= MAX_FILENAME_LENGTH] filename) { + NULL, + /** + * The friend_number passed did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + /** + * This client is currently not connected to the friend. + */ + FRIEND_NOT_CONNECTED, + /** + * Filename length exceeded $MAX_FILENAME_LENGTH bytes. + */ + NAME_TOO_LONG, + /** + * Too many ongoing transfers. The maximum number of concurrent file transfers + * is 256 per friend per direction (sending and receiving). + */ + TOO_MANY, + } + + + /** + * Send a chunk of file data to a friend. + * + * This function is called in response to the `${event chunk_request}` callback. The + * length parameter should be equal to the one received though the callback. + * If it is zero, the transfer is assumed complete. For files with known size, + * Core will know that the transfer is complete after the last byte has been + * received, so it is not necessary (though not harmful) to send a zero-length + * chunk to terminate. For streams, core will know that the transfer is finished + * if a chunk with length less than the length requested in the callback is sent. + * + * @param friend_number The friend number of the receiving friend for this file. + * @param file_number The file transfer identifier returned by tox_file_send. + * @param position The file or stream position from which to continue reading. + * @return true on success. + */ + bool send_chunk(uint32_t friend_number, uint32_t file_number, uint64_t position, const uint8_t[length] data) { + /** + * The length parameter was non-zero, but data was NULL. + */ + NULL, + /** + * The friend_number passed did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + /** + * This client is currently not connected to the friend. + */ + FRIEND_NOT_CONNECTED, + /** + * No file transfer with the given file number was found for the given friend. + */ + NOT_FOUND, + /** + * File transfer was found but isn't in a transferring state: (paused, done, + * broken, etc...) (happens only when not called from the request chunk callback). + */ + NOT_TRANSFERRING, + /** + * Attempted to send more or less data than requested. The requested data size is + * adjusted according to maximum transmission unit and the expected end of + * the file. Trying to send less or more than requested will return this error. + */ + INVALID_LENGTH, + /** + * Packet queue is full. + */ + SENDQ, + /** + * Position parameter was wrong. + */ + WRONG_POSITION, + } + + + /** + * This event is triggered when Core is ready to send more file data. + */ + event chunk_request const { + /** + * If the length parameter is 0, the file transfer is finished, and the client's + * resources associated with the file number should be released. After a call + * with zero length, the file number can be reused for future file transfers. + * + * If the requested position is not equal to the client's idea of the current + * file or stream position, it will need to seek. In case of read-once streams, + * the client should keep the last read chunk so that a seek back can be + * supported. A seek-back only ever needs to read from the last requested chunk. + * This happens when a chunk was requested, but the send failed. A seek-back + * request can occur an arbitrary number of times for any given chunk. + * + * In response to receiving this callback, the client should call the function + * `$send_chunk` with the requested chunk. If the number of bytes sent + * through that function is zero, the file transfer is assumed complete. A + * client must send the full length of data requested with this callback. + * + * @param friend_number The friend number of the receiving friend for this file. + * @param file_number The file transfer identifier returned by $send. + * @param position The file or stream position from which to continue reading. + * @param length The number of bytes requested for the current chunk. + */ + typedef void(uint32_t friend_number, uint32_t file_number, uint64_t position, size_t length); + } + +} + + +/******************************************************************************* + * + * :: File transmission: receiving + * + ******************************************************************************/ + + +namespace file { + + /** + * This event is triggered when a file transfer request is received. + */ + event recv const { + /** + * The client should acquire resources to be associated with the file transfer. + * Incoming file transfers start in the PAUSED state. After this callback + * returns, a transfer can be rejected by sending a ${CONTROL.CANCEL} + * control command before any other control commands. It can be accepted by + * sending ${CONTROL.RESUME}. + * + * @param friend_number The friend number of the friend who is sending the file + * transfer request. + * @param file_number The friend-specific file number the data received is + * associated with. + * @param kind The meaning of the file to be sent. + * @param file_size Size in bytes of the file the client wants to send, + * UINT64_MAX if unknown or streaming. + * @param filename Name of the file. Does not need to be the actual name. This + * name will be sent along with the file send request. + * @param filename_length Size in bytes of the filename. + */ + typedef void(uint32_t friend_number, uint32_t file_number, uint32_t kind, + uint64_t file_size, const uint8_t[filename_length <= MAX_FILENAME_LENGTH] filename); + } + + + /** + * This event is first triggered when a file transfer request is received, and + * subsequently when a chunk of file data for an accepted request was received. + */ + event recv_chunk const { + /** + * When length is 0, the transfer is finished and the client should release the + * resources it acquired for the transfer. After a call with length = 0, the + * file number can be reused for new file transfers. + * + * If position is equal to file_size (received in the file_receive callback) + * when the transfer finishes, the file was received completely. Otherwise, if + * file_size was UINT64_MAX, streaming ended successfully when length is 0. + * + * @param friend_number The friend number of the friend who is sending the file. + * @param file_number The friend-specific file number the data received is + * associated with. + * @param position The file position of the first byte in data. + * @param data A byte array containing the received chunk. + * @param length The length of the received chunk. + */ + typedef void(uint32_t friend_number, uint32_t file_number, uint64_t position, + const uint8_t[length] data); + } + +} + + +/******************************************************************************* + * + * :: Conference management + * + ******************************************************************************/ + +namespace conference { + + /** + * Conference types for the ${event invite} event. + */ + enum class TYPE { + /** + * Text-only conferences that must be accepted with the $join function. + */ + TEXT, + /** + * Video conference. The function to accept these is in toxav. + */ + AV, + } + + + /** + * This event is triggered when the client is invited to join a conference. + */ + event invite const { + /** + * The invitation will remain valid until the inviting friend goes offline + * or exits the conference. + * + * @param friend_number The friend who invited us. + * @param type The conference type (text only or audio/video). + * @param cookie A piece of data of variable length required to join the + * conference. + * @param length The length of the cookie. + */ + typedef void(uint32_t friend_number, TYPE type, const uint8_t[length] cookie); + } + + + /** + * This event is triggered when the client receives a conference message. + */ + event message const { + /** + * @param conference_number The conference number of the conference the message is intended for. + * @param peer_number The ID of the peer who sent the message. + * @param type The type of message (normal, action, ...). + * @param message The message data. + * @param length The length of the message. + */ + typedef void(uint32_t conference_number, uint32_t peer_number, MESSAGE_TYPE type, + const uint8_t[length] message); + } + + + /** + * This event is triggered when a peer changes the conference title. + * + * If peer_number == UINT32_MAX, then author is unknown (e.g. initial joining the conference). + */ + event title const { + /** + * @param conference_number The conference number of the conference the title change is intended for. + * @param peer_number The ID of the peer who changed the title. + * @param title The title data. + * @param length The title length. + */ + typedef void(uint32_t conference_number, uint32_t peer_number, const uint8_t[length] title); + } + + /** + * Peer list state change types. + */ + enum class STATE_CHANGE { + /** + * A peer has joined the conference. + */ + PEER_JOIN, + /** + * A peer has exited the conference. + */ + PEER_EXIT, + /** + * A peer has changed their name. + */ + PEER_NAME_CHANGE, + } + + /** + * This event is triggered when the peer list changes (name change, peer join, peer exit). + */ + event namelist_change const { + /** + * @param conference_number The conference number of the conference the title change is intended for. + * @param peer_number The ID of the peer who changed the title. + * @param change The type of change (one of $STATE_CHANGE). + */ + typedef void(uint32_t conference_number, uint32_t peer_number, STATE_CHANGE change); + } + + + /** + * Creates a new conference. + * + * This function creates a new text conference. + * + * @return conference number on success, or UINT32_MAX on failure. + */ + uint32_t new() { + /** + * The conference instance failed to initialize. + */ + INIT, + } + + /** + * This function deletes a conference. + * + * @param conference_number The conference number of the conference to be deleted. + * + * @return true on success. + */ + bool delete(uint32_t conference_number) { + /** + * The conference number passed did not designate a valid conference. + */ + CONFERENCE_NOT_FOUND, + } + + + namespace peer { + + /** + * Error codes for peer info queries. + */ + error for query { + /** + * The conference number passed did not designate a valid conference. + */ + CONFERENCE_NOT_FOUND, + /** + * The peer number passed did not designate a valid peer. + */ + PEER_NOT_FOUND, + /** + * The client is not connected to the conference. + */ + NO_CONNECTION, + } + + /** + * Return the number of peers in the conference. Return value is unspecified on failure. + */ + const uint32_t count(uint32_t conference_number) + with error for query; + + uint8_t[size] name { + + /** + * Return the length of the peer's name. Return value is unspecified on failure. + */ + size(uint32_t conference_number, uint32_t peer_number) + with error for query; + + /** + * Copy the name of peer_number who is in conference_number to name. + * name must be at least $MAX_NAME_LENGTH long. + * + * @return true on success. + */ + get(uint32_t conference_number, uint32_t peer_number) + with error for query; + } + + /** + * Copy the public key of peer_number who is in conference_number to public_key. + * public_key must be $PUBLIC_KEY_SIZE long. + * + * @return true on success. + */ + uint8_t[PUBLIC_KEY_SIZE] public_key { + get(uint32_t conference_number, uint32_t peer_number) + with error for query; + } + + /** + * Return true if passed peer_number corresponds to our own. + */ + const bool number_is_ours(uint32_t conference_number, uint32_t peer_number) + with error for query; + + } + + + /** + * Invites a friend to a conference. + * + * @param friend_number The friend number of the friend we want to invite. + * @param conference_number The conference number of the conference we want to invite the friend to. + * + * @return true on success. + */ + bool invite(uint32_t friend_number, uint32_t conference_number) { + /** + * The conference number passed did not designate a valid conference. + */ + CONFERENCE_NOT_FOUND, + /** + * The invite packet failed to send. + */ + FAIL_SEND, + } + + + /** + * Joins a conference that the client has been invited to. + * + * @param friend_number The friend number of the friend who sent the invite. + * @param cookie Received via the `${event invite}` event. + * @param length The size of cookie. + * + * @return conference number on success, UINT32_MAX on failure. + */ + uint32_t join(uint32_t friend_number, const uint8_t[length] cookie) { + /** + * The cookie passed has an invalid length. + */ + INVALID_LENGTH, + /** + * The conference is not the expected type. This indicates an invalid cookie. + */ + WRONG_TYPE, + /** + * The friend number passed does not designate a valid friend. + */ + FRIEND_NOT_FOUND, + /** + * Client is already in this conference. + */ + DUPLICATE, + /** + * Conference instance failed to initialize. + */ + INIT_FAIL, + /** + * The join packet failed to send. + */ + FAIL_SEND, + } + + + namespace send { + + /** + * Send a text chat message to the conference. + * + * This function creates a conference message packet and pushes it into the send + * queue. + * + * The message length may not exceed $MAX_MESSAGE_LENGTH. Larger messages + * must be split by the client and sent as separate messages. Other clients can + * then reassemble the fragments. + * + * @param conference_number The conference number of the conference the message is intended for. + * @param type Message type (normal, action, ...). + * @param message A non-NULL pointer to the first element of a byte array + * containing the message text. + * @param length Length of the message to be sent. + * + * @return true on success. + */ + bool message(uint32_t conference_number, MESSAGE_TYPE type, const uint8_t[length] message) { + /** + * The conference number passed did not designate a valid conference. + */ + CONFERENCE_NOT_FOUND, + /** + * The message is too long. + */ + TOO_LONG, + /** + * The client is not connected to the conference. + */ + NO_CONNECTION, + /** + * The message packet failed to send. + */ + FAIL_SEND, + } + } + + error for title { + /** + * The conference number passed did not designate a valid conference. + */ + CONFERENCE_NOT_FOUND, + /** + * The title is too long or empty. + */ + INVALID_LENGTH, + /** + * The title packet failed to send. + */ + FAIL_SEND, + } + + uint8_t[length <= MAX_NAME_LENGTH] title { + + /** + * Return the length of the conference title. Return value is unspecified on failure. + * + * The return value is equal to the `length` argument received by the last + * `${event title}` callback. + */ + size(uint32_t conference_number) + with error for title; + + /** + * Write the title designated by the given conference number to a byte array. + * + * Call $size to determine the allocation size for the `title` parameter. + * + * The data written to `title` is equal to the data received by the last + * `${event title}` callback. + * + * @param title A valid memory region large enough to store the title. + * If this parameter is NULL, this function has no effect. + * + * @return true on success. + */ + get(uint32_t conference_number) + with error for title; + + /** + * Set the conference title and broadcast it to the rest of the conference. + * + * Title length cannot be longer than $MAX_NAME_LENGTH. + * + * @return true on success. + */ + set(uint32_t conference_number) + with error for title; + } + + + uint32_t[size] chatlist { + /** + * Return the number of conferences in the Tox instance. + * This should be used to determine how much memory to allocate for `$get`. + */ + size(); + + /** + * Copy a list of valid conference IDs into the array chatlist. Determine how much space + * to allocate for the array with the `$size` function. + */ + get(); + } + + + /** + * Returns the type of conference ($TYPE) that conference_number is. Return value is + * unspecified on failure. + */ + TYPE type { + get(uint32_t conference_number) { + /** + * The conference number passed did not designate a valid conference. + */ + CONFERENCE_NOT_FOUND, + } + } + +} + + +/******************************************************************************* + * + * :: Low-level custom packet sending and receiving + * + ******************************************************************************/ + + +namespace friend { + + inline namespace send { + + error for custom_packet { + NULL, + /** + * The friend number did not designate a valid friend. + */ + FRIEND_NOT_FOUND, + /** + * This client is currently not connected to the friend. + */ + FRIEND_NOT_CONNECTED, + /** + * The first byte of data was not in the specified range for the packet type. + * This range is 200-254 for lossy, and 160-191 for lossless packets. + */ + INVALID, + /** + * Attempted to send an empty packet. + */ + EMPTY, + /** + * Packet data length exceeded $MAX_CUSTOM_PACKET_SIZE. + */ + TOO_LONG, + /** + * Packet queue is full. + */ + SENDQ, + } + + /** + * Send a custom lossy packet to a friend. + * + * The first byte of data must be in the range 200-254. Maximum length of a + * custom packet is $MAX_CUSTOM_PACKET_SIZE. + * + * Lossy packets behave like UDP packets, meaning they might never reach the + * other side or might arrive more than once (if someone is messing with the + * connection) or might arrive in the wrong order. + * + * Unless latency is an issue, it is recommended that you use lossless custom + * packets instead. + * + * @param friend_number The friend number of the friend this lossy packet + * should be sent to. + * @param data A byte array containing the packet data. + * @param length The length of the packet data byte array. + * + * @return true on success. + */ + bool lossy_packet(uint32_t friend_number, const uint8_t[length <= MAX_CUSTOM_PACKET_SIZE] data) + with error for custom_packet; + + + /** + * Send a custom lossless packet to a friend. + * + * The first byte of data must be in the range 160-191. Maximum length of a + * custom packet is $MAX_CUSTOM_PACKET_SIZE. + * + * Lossless packet behaviour is comparable to TCP (reliability, arrive in order) + * but with packets instead of a stream. + * + * @param friend_number The friend number of the friend this lossless packet + * should be sent to. + * @param data A byte array containing the packet data. + * @param length The length of the packet data byte array. + * + * @return true on success. + */ + bool lossless_packet(uint32_t friend_number, const uint8_t[length <= MAX_CUSTOM_PACKET_SIZE] data) + with error for custom_packet; + + } + + + event lossy_packet const { + /** + * @param friend_number The friend number of the friend who sent a lossy packet. + * @param data A byte array containing the received packet data. + * @param length The length of the packet data byte array. + */ + typedef void(uint32_t friend_number, const uint8_t[length <= MAX_CUSTOM_PACKET_SIZE] data); + } + + + event lossless_packet const { + /** + * @param friend_number The friend number of the friend who sent the packet. + * @param data A byte array containing the received packet data. + * @param length The length of the packet data byte array. + */ + typedef void(uint32_t friend_number, const uint8_t[length <= MAX_CUSTOM_PACKET_SIZE] data); + } + +} + + + +/******************************************************************************* + * + * :: Low-level network information + * + ******************************************************************************/ + + +inline namespace self { + + uint8_t[PUBLIC_KEY_SIZE] dht_id { + /** + * Writes the temporary DHT public key of this instance to a byte array. + * + * This can be used in combination with an externally accessible IP address and + * the bound port (from ${udp_port.get}) to run a temporary bootstrap node. + * + * Be aware that every time a new instance is created, the DHT public key + * changes, meaning this cannot be used to run a permanent bootstrap node. + * + * @param dht_id A memory region of at least $PUBLIC_KEY_SIZE bytes. If this + * parameter is NULL, this function has no effect. + */ + get(); + } + + + error for get_port { + /** + * The instance was not bound to any port. + */ + NOT_BOUND, + } + + + uint16_t udp_port { + /** + * Return the UDP port this Tox instance is bound to. + */ + get() with error for get_port; + } + + + uint16_t tcp_port { + /** + * Return the TCP port this Tox instance is bound to. This is only relevant if + * the instance is acting as a TCP relay. + */ + get() with error for get_port; + } + +} + +} // class tox + +%{ +#ifdef __cplusplus +} +#endif + +#endif +%} |