421 lines
16 KiB
C
421 lines
16 KiB
C
/*
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uSynergy client -- Interface for the embedded Synergy client library
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version 1.0.0, July 7th, 2012
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Copyright (C) 2012 Synergy Si Ltd.
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Copyright (c) 2012 Alex Evans
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*/
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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//---------------------------------------------------------------------------------------------------------------------
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// Configuration
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//---------------------------------------------------------------------------------------------------------------------
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/**
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@brief Determine endianness
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**/
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#if defined(USYNERGY_LITTLE_ENDIAN) && defined(USYNERGY_BIG_ENDIAN)
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/* Ambiguous: both endians specified */
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#error "Can't define both USYNERGY_LITTLE_ENDIAN and USYNERGY_BIG_ENDIAN"
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#elif !defined(USYNERGY_LITTLE_ENDIAN) && !defined(USYNERGY_BIG_ENDIAN)
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/* Attempt to auto detect */
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#if defined(__LITTLE_ENDIAN__) || defined(LITTLE_ENDIAN) || (_BYTE_ORDER == _LITTLE_ENDIAN)
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#define USYNERGY_LITTLE_ENDIAN
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#elif defined(__BIG_ENDIAN__) || defined(BIG_ENDIAN) || (_BYTE_ORDER == _BIG_ENDIAN)
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#define USYNERGY_BIG_ENDIAN
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#else
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#error "Can't detect endian-nes, please defined either USYNERGY_LITTLE_ENDIAN or USYNERGY_BIG_ENDIAN";
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#endif
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#else
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/* User-specified endian-nes, nothing to do for us */
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#endif
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//---------------------------------------------------------------------------------------------------------------------
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// Types and Constants
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//---------------------------------------------------------------------------------------------------------------------
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/**
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@brief Boolean type
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**/
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typedef int uSynergyBool;
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#define USYNERGY_FALSE 0 /* False value */
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#define USYNERGY_TRUE 1 /* True value */
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/**
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@brief User context type
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The uSynergyCookie type is an opaque type that is used by uSynergy to communicate to the client. It is passed along to
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callback functions as context.
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**/
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typedef struct { int ignored; } * uSynergyCookie;
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/**
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@brief Clipboard types
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**/
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enum uSynergyClipboardFormat
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{
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USYNERGY_CLIPBOARD_FORMAT_TEXT = 0, /* Text format, UTF-8, newline is LF */
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USYNERGY_CLIPBOARD_FORMAT_BITMAP = 1, /* Bitmap format, BMP 24/32bpp, BI_RGB */
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USYNERGY_CLIPBOARD_FORMAT_HTML = 2, /* HTML format, HTML fragment, UTF-8, newline is LF */
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};
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/**
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@brief Constants and limits
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**/
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#define USYNERGY_NUM_JOYSTICKS 4 /* Maximum number of supported joysticks */
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#define USYNERGY_PROTOCOL_MAJOR 1 /* Major protocol version */
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#define USYNERGY_PROTOCOL_MINOR 4 /* Minor protocol version */
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#define USYNERGY_IDLE_TIMEOUT 2000 /* Timeout in milliseconds before reconnecting */
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#define USYNERGY_TRACE_BUFFER_SIZE 1024 /* Maximum length of traced message */
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#define USYNERGY_REPLY_BUFFER_SIZE 1024 /* Maximum size of a reply packet */
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#define USYNERGY_RECEIVE_BUFFER_SIZE 4096 /* Maximum size of an incoming packet */
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/**
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@brief Keyboard constants
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**/
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#define USYNERGY_MODIFIER_SHIFT 0x0001 /* Shift key modifier */
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#define USYNERGY_MODIFIER_CTRL 0x0002 /* Ctrl key modifier */
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#define USYNERGY_MODIFIER_ALT 0x0004 /* Alt key modifier */
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#define USYNERGY_MODIFIER_META 0x0008 /* Meta key modifier */
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#define USYNERGY_MODIFIER_WIN 0x0010 /* Windows key modifier */
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#define USYNERGY_MODIFIER_ALT_GR 0x0020 /* AltGr key modifier */
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#define USYNERGY_MODIFIER_LEVEL5LOCK 0x0040 /* Level5Lock key modifier */
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#define USYNERGY_MODIFIER_CAPSLOCK 0x1000 /* CapsLock key modifier */
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#define USYNERGY_MODIFIER_NUMLOCK 0x2000 /* NumLock key modifier */
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#define USYNERGY_MODIFIER_SCROLLOCK 0x4000 /* ScrollLock key modifier */
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//---------------------------------------------------------------------------------------------------------------------
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// Functions and Callbacks
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//---------------------------------------------------------------------------------------------------------------------
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/**
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@brief Connect function
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This function is called when uSynergy needs to connect to the host. It doesn't imply a network implementation or
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destination address, that must all be handled on the user side. The function should return USYNERGY_TRUE if a
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connection was established or USYNERGY_FALSE if it could not connect.
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When network errors occur (e.g. uSynergySend or uSynergyReceive fail) then the connect call will be called again
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so the implementation of the function must close any old connections and clean up resources before retrying.
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@param cookie Cookie supplied in the Synergy context
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**/
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typedef uSynergyBool (*uSynergyConnectFunc)(uSynergyCookie cookie);
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/**
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@brief Send function
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This function is called when uSynergy needs to send something over the default connection. It should return
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USYNERGY_TRUE if sending succeeded and USYNERGY_FALSE otherwise. This function should block until the send
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operation is completed.
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@param cookie Cookie supplied in the Synergy context
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@param buffer Address of buffer to send
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@param length Length of buffer to send
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**/
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typedef uSynergyBool (*uSynergySendFunc)(uSynergyCookie cookie, const uint8_t *buffer, int length);
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/**
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@brief Receive function
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This function is called when uSynergy needs to receive data from the default connection. It should return
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USYNERGY_TRUE if receiving data succeeded and USYNERGY_FALSE otherwise. This function should block until data
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has been received and wait for data to become available. If @a outLength is set to 0 upon completion it is
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assumed that the connection is alive, but still in a connecting state and needs time to settle.
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@param cookie Cookie supplied in the Synergy context
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@param buffer Address of buffer to receive data into
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@param maxLength Maximum amount of bytes to write into the receive buffer
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@param outLength Address of integer that receives the actual amount of bytes written into @a buffer
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**/
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typedef uSynergyBool (*uSynergyReceiveFunc)(uSynergyCookie cookie, uint8_t *buffer, int maxLength, int* outLength);
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/**
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@brief Thread sleep function
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This function is called when uSynergy wants to suspend operation for a while before retrying an operation. It
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is mostly used when a socket times out or disconnect occurs to prevent uSynergy from continuously hammering a
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network connection in case the network is down.
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@param cookie Cookie supplied in the Synergy context
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@param timeMs Time to sleep the current thread (in milliseconds)
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**/
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typedef void (*uSynergySleepFunc)(uSynergyCookie cookie, int timeMs);
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/**
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@brief Get time function
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This function is called when uSynergy needs to know the current time. This is used to determine when timeouts
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have occured. The time base should be a cyclic millisecond time value.
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@returns Time value in milliseconds
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**/
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typedef uint32_t (*uSynergyGetTimeFunc)();
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/**
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@brief Trace function
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This function is called when uSynergy wants to trace something. It is optional to show these messages, but they
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are often useful when debugging. uSynergy only traces major events like connecting and disconnecting. Usually
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only a single trace is shown when the connection is established and no more trace are called.
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@param cookie Cookie supplied in the Synergy context
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@param text Text to be traced
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**/
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typedef void (*uSynergyTraceFunc)(uSynergyCookie cookie, const char *text);
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/**
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@brief Screen active callback
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This callback is called when Synergy makes the screen active or inactive. This
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callback is usually sent when the mouse enters or leaves the screen.
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@param cookie Cookie supplied in the Synergy context
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@param active Activation flag, 1 if the screen has become active, 0 if the screen has become inactive
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**/
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typedef void (*uSynergyScreenActiveCallback)(uSynergyCookie cookie, uSynergyBool active);
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/**
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@brief Mouse callback
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This callback is called when a mouse events happens. The mouse X and Y position,
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wheel and button state is communicated in the message. It's up to the user to
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interpret if this is a mouse up, down, double-click or other message.
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@param cookie Cookie supplied in the Synergy context
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@param x Mouse X position
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@param y Mouse Y position
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@param wheelX Mouse wheel X position
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@param wheelY Mouse wheel Y position
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@param buttonLeft Left button pressed status, 0 for released, 1 for pressed
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@param buttonMiddle Middle button pressed status, 0 for released, 1 for pressed
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@param buttonRight Right button pressed status, 0 for released, 1 for pressed
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**/
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typedef void (*uSynergyMouseCallback)(uSynergyCookie cookie, uint16_t x, uint16_t y, int16_t wheelX, int16_t wheelY, uSynergyBool buttonLeft, uSynergyBool buttonRight, uSynergyBool buttonMiddle);
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/**
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@brief Key event callback
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This callback is called when a key is pressed or released.
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@param cookie Cookie supplied in the Synergy context
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@param key Key code of key that was pressed or released
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@param modifiers Status of modifier keys (alt, shift, etc.)
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@param down Down or up status, 1 is key is pressed down, 0 if key is released (up)
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@param repeat Repeat flag, 1 if the key is down because the key is repeating, 0 if the key is initially pressed by the user
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**/
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typedef void (*uSynergyKeyboardCallback)(uSynergyCookie cookie, uint16_t key, uint16_t modifiers, uSynergyBool down, uSynergyBool repeat);
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/**
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@brief Joystick event callback
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This callback is called when a joystick stick or button changes. It is possible that multiple callbacks are
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fired when different sticks or buttons change as these are individual messages in the packet stream. Each
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callback will contain all the valid state for the different axes and buttons. The last callback received will
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represent the most current joystick state.
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@param cookie Cookie supplied in the Synergy context
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@param joyNum Joystick number, always in the range [0 ... USYNERGY_NUM_JOYSTICKS>
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@param buttons Button pressed mask
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@param leftStickX Left stick X position, in range [-127 ... 127]
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@param leftStickY Left stick Y position, in range [-127 ... 127]
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@param rightStickX Right stick X position, in range [-127 ... 127]
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@param rightStickY Right stick Y position, in range [-127 ... 127]
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**/
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typedef void (*uSynergyJoystickCallback)(uSynergyCookie cookie, uint8_t joyNum, uint16_t buttons, int8_t leftStickX, int8_t leftStickY, int8_t rightStickX, int8_t rightStickY);
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/**
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@brief Clipboard event callback
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This callback is called when something is placed on the clipboard. Multiple callbacks may be fired for
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multiple clipboard formats if they are supported. The data provided is read-only and may not be modified
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by the application.
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@param cookie Cookie supplied in the Synergy context
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@param format Clipboard format
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@param data Memory area containing the clipboard raw data
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@param size Size of clipboard data
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**/
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typedef void (*uSynergyClipboardCallback)(uSynergyCookie cookie, enum uSynergyClipboardFormat format, const uint8_t *data, uint32_t size);
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//---------------------------------------------------------------------------------------------------------------------
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// Context
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//---------------------------------------------------------------------------------------------------------------------
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/**
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@brief uSynergy context
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**/
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typedef struct
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{
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/* Mandatory configuration data, filled in by client */
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uSynergyConnectFunc m_connectFunc; /* Connect function */
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uSynergySendFunc m_sendFunc; /* Send data function */
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uSynergyReceiveFunc m_receiveFunc; /* Receive data function */
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uSynergySleepFunc m_sleepFunc; /* Thread sleep function */
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uSynergyGetTimeFunc m_getTimeFunc; /* Get current time function */
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const char* m_clientName; /* Name of Synergy Screen / Client */
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uint16_t m_clientWidth; /* Width of screen */
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uint16_t m_clientHeight; /* Height of screen */
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/* Optional configuration data, filled in by client */
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uSynergyCookie m_cookie; /* Cookie pointer passed to callback functions (can be NULL) */
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uSynergyTraceFunc m_traceFunc; /* Function for tracing status (can be NULL) */
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uSynergyScreenActiveCallback m_screenActiveCallback; /* Callback for entering and leaving screen */
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uSynergyMouseCallback m_mouseCallback; /* Callback for mouse events */
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uSynergyKeyboardCallback m_keyboardCallback; /* Callback for keyboard events */
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uSynergyJoystickCallback m_joystickCallback; /* Callback for joystick events */
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uSynergyClipboardCallback m_clipboardCallback; /* Callback for clipboard events */
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/* State data, used internall by client, initialized by uSynergyInit() */
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uSynergyBool m_connected; /* Is our socket connected? */
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uSynergyBool m_hasReceivedHello; /* Have we received a 'Hello' from the server? */
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uSynergyBool m_isCaptured; /* Is Synergy active (i.e. this client is receiving input messages?) */
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uint32_t m_lastMessageTime; /* Time at which last message was received */
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uint32_t m_sequenceNumber; /* Packet sequence number */
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uint8_t m_receiveBuffer[USYNERGY_RECEIVE_BUFFER_SIZE]; /* Receive buffer */
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int m_receiveOfs; /* Receive buffer offset */
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uint8_t m_replyBuffer[USYNERGY_REPLY_BUFFER_SIZE]; /* Reply buffer */
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uint8_t* m_replyCur; /* Write offset into reply buffer */
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uint16_t m_mouseX; /* Mouse X position */
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uint16_t m_mouseY; /* Mouse Y position */
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int16_t m_mouseWheelX; /* Mouse wheel X position */
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int16_t m_mouseWheelY; /* Mouse wheel Y position */
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uSynergyBool m_mouseButtonLeft; /* Mouse left button */
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uSynergyBool m_mouseButtonRight; /* Mouse right button */
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uSynergyBool m_mouseButtonMiddle; /* Mouse middle button */
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int8_t m_joystickSticks[USYNERGY_NUM_JOYSTICKS][4]; /* Joystick stick position in 2 axes for 2 sticks */
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uint16_t m_joystickButtons[USYNERGY_NUM_JOYSTICKS]; /* Joystick button state */
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} uSynergyContext;
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//---------------------------------------------------------------------------------------------------------------------
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// Interface
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//---------------------------------------------------------------------------------------------------------------------
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/**
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@brief Initialize uSynergy context
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This function initializes @a context for use. Call this function directly after
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creating the context, before filling in any configuration data in it. Not calling
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this function will cause undefined behavior.
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@param context Context to be initialized
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**/
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extern void uSynergyInit(uSynergyContext *context);
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/**
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@brief Update uSynergy
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This function updates uSynergy and does the bulk of the work. It does connection management,
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receiving data, reconnecting after errors or timeouts and so on. It assumes that networking
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operations are blocking and it can suspend the current thread if it needs to wait. It is
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best practice to call uSynergyUpdate from a background thread so it is responsive.
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Because uSynergy relies mostly on blocking calls it will mostly stay in thread sleep state
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waiting for system mutexes and won't eat much memory.
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uSynergyUpdate doesn't do any memory allocations or have any side effects beyond those of
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the callbacks it calls.
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@param context Context to be updated
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**/
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extern void uSynergyUpdate(uSynergyContext *context);
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/**
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@brief Send clipboard data
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This function sets new clipboard data and sends it to the server. Use this function if
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your client cuts or copies data onto the clipboard that it needs to share with the
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server.
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Currently there is only support for plaintext, but HTML and image data could be
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supported with some effort.
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@param context Context to send clipboard data to
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@param text Text to set to the clipboard
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**/
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extern void uSynergySendClipboard(uSynergyContext *context, const char *text);
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#ifdef __cplusplus
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};
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#endif
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