Very minimal first version; connects, sends presence updates inline, disconnects. Other than opening pipe does no allocations.
This commit is contained in:
Chris Marsh
parent
390bed4d71
commit
4b77b81b2d
1 changed files with 269 additions and 4 deletions
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@ -1,23 +1,288 @@
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#include "discord-rpc.h"
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static DiscordEventHandlers Handlers;
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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// todo: think about making per-platform versions of this whole file, or wrapping the platform specific parts -- win32 for first version
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#include <windows.h>
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static const wchar_t* PipeName = L"\\\\.\\pipe\\DiscordRpcServer";
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static HANDLE PipeHandle{INVALID_HANDLE_VALUE};
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static char ApplicationId[64]{};
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static DiscordEventHandlers Handlers{};
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static char MessageBuffer[64 * 1024];
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// if only there was a standard library function for this
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size_t StringCopy(char* dest, const char* src, size_t maxBytes) {
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if (!dest || !src || !maxBytes) {
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return 0;
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}
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size_t copied;
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for (copied = 1; *src && copied < maxBytes; ++copied) {
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*dest++ = *src++;
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}
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*dest = 0;
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return copied - 1;
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}
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size_t StringCopy(char* dest, const char* src) {
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if (!dest || !src) {
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return 0;
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}
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size_t copied;
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for (copied = 1; *src; ++copied) {
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*dest++ = *src++;
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}
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*dest = 0;
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return copied - 1;
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}
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void EscapeString(char*& dest, const char* src)
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{
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for (char c = *src++; c; c = *src++) {
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switch (c) {
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case '\"':
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case '\\':
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*dest++ = '\\';
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*dest++ = c;
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break;
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case '\b':
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*dest++ = '\\';
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*dest++ = 'b';
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break;
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case '\f': // Form feed(ascii code 0C)
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*dest++ = '\\';
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*dest++ = 'f';
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break;
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case '\n': // New line
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*dest++ = '\\';
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*dest++ = 'n';
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break;
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case '\r': // Carriage return
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*dest++ = '\\';
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*dest++ = 'r';
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break;
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case '\t': // Tab
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*dest++ = '\\';
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*dest++ = 't';
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break;
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default:
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*dest++ = c;
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break;
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}
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}
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}
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template<typename T> void NumberToString(char*& dest, T number)
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{
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if (!number) {
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*dest++ = '0';
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return;
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}
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if (number < 0) {
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*dest++ = '-';
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number = -number;
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}
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char temp[32];
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int place = 0;
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while (number) {
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auto digit = number % 10;
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number = number / 10;
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temp[place++] = '0' + (char)digit;
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}
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for (--place; place >= 0; --place) {
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*dest++ = temp[place];
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}
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*dest = 0;
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}
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void JsonWritePropName(char*& dest, const char* name)
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{
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*dest++ = '"';
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dest += StringCopy(dest, name);
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*dest++ = '"';
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*dest++ = ':';
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*dest++ = ' ';
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}
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void JsonWritePropSep(char*& dest)
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{
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*dest++ = ',';
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*dest++ = ' ';
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}
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void JsonWriteStringProp(char*& dest, const char* name, const char* value)
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{
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JsonWritePropName(dest, name);
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*dest++ = '"';
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EscapeString(dest, value);
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*dest++ = '"';
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JsonWritePropSep(dest);
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}
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template<typename T>
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void JsonWriteNumberAsStringProp(char*& dest, const char* name, T value)
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{
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JsonWritePropName(dest, name);
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*dest++ = '"';
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NumberToString(dest, value);
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*dest++ = '"';
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JsonWritePropSep(dest);
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}
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template<typename T>
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void JsonWriteNumberProp(char*& dest, const char* name, T value)
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{
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JsonWritePropName(dest, name);
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NumberToString(dest, value);
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JsonWritePropSep(dest);
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}
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void JsonWriteBoolProp(char*& dest, const char* name, bool value)
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{
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JsonWritePropName(dest, name);
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dest += StringCopy(dest, value ? "true" : "false");
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JsonWritePropSep(dest);
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}
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void JsonWriteRichPresenceObj(char*& dest, const DiscordRichPresence* presence)
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{
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*dest++ = '{';
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if (presence->state) {
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JsonWriteStringProp(dest, "state", presence->state);
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}
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if (presence->details) {
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JsonWriteStringProp(dest, "details", presence->details);
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}
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if (presence->startTimestamp) {
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JsonWriteNumberAsStringProp(dest, "start_timestamp", presence->startTimestamp);
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}
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if (presence->endTimestamp) {
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JsonWriteNumberAsStringProp(dest, "end_timestamp", presence->endTimestamp);
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}
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if (presence->largeImageKey) {
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JsonWriteStringProp(dest, "large_image_key", presence->largeImageKey);
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}
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if (presence->largeImageText) {
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JsonWriteStringProp(dest, "large_image_text", presence->largeImageText);
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}
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if (presence->smallImageKey) {
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JsonWriteStringProp(dest, "small_image_key", presence->smallImageKey);
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}
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if (presence->smallImageText) {
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JsonWriteStringProp(dest, "small_image_text", presence->smallImageText);
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}
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if (presence->partyId) {
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JsonWriteStringProp(dest, "party_id", presence->partyId);
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}
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if (presence->partyMax) {
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JsonWriteNumberProp(dest, "party_size", presence->partySize);
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JsonWriteNumberProp(dest, "party_max", presence->partyMax);
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}
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if (presence->matchSecret) {
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JsonWriteStringProp(dest, "match_secret", presence->matchSecret);
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}
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if (presence->joinSecret) {
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JsonWriteStringProp(dest, "join_secret", presence->joinSecret);
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}
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if (presence->spectateSecret) {
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JsonWriteStringProp(dest, "spectate_secret", presence->spectateSecret);
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}
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JsonWriteBoolProp(dest, "instance", presence->instance);
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dest -= 1;
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*(dest - 1) = '}';
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}
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void OpenConnection()
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{
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for (;;) {
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PipeHandle = CreateFileW(PipeName, GENERIC_READ | GENERIC_WRITE, 0, nullptr, OPEN_EXISTING, 0, nullptr);
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if (PipeHandle != INVALID_HANDLE_VALUE) {
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break;
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}
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if (GetLastError() != ERROR_PIPE_BUSY) {
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printf("Could not open pipe. Error: %d\n", GetLastError());
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return;
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}
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if (!WaitNamedPipeW(PipeName, 10000)) {
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printf("Could not open pipe: 10 second wait timed out.\n");
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return;
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}
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}
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}
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void CloseConnection()
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{
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CloseHandle(PipeHandle);
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PipeHandle = INVALID_HANDLE_VALUE;
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if (Handlers.disconnected) {
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Handlers.disconnected();
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}
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}
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void Discord_Initialize(const char* applicationId, DiscordEventHandlers* handlers)
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{
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StringCopy(ApplicationId, applicationId, sizeof(ApplicationId));
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if (handlers) {
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memcpy(&Handlers, handlers, sizeof(Handlers));
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Handlers = *handlers;
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}
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else {
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memset(&Handlers, 0, sizeof(Handlers));
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Handlers = {};
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}
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OpenConnection();
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if (PipeHandle != INVALID_HANDLE_VALUE) {
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if (Handlers.ready) {
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Handlers.ready();
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}
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}
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}
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void Discord_Shutdown()
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{
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Handlers = {};
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CloseConnection();
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}
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void Discord_UpdatePresence(const DiscordRichPresence* presence)
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{
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if (PipeHandle == INVALID_HANDLE_VALUE) {
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OpenConnection();
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if (PipeHandle == INVALID_HANDLE_VALUE) {
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return;
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}
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}
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int32_t* totalLength = (int32_t*)MessageBuffer;
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char* jsonStart = MessageBuffer + sizeof(int32_t);
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char* jsonWrite = jsonStart;
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JsonWriteRichPresenceObj(jsonWrite, presence);
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*totalLength = sizeof(int32_t) + (jsonWrite - jsonStart);
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BOOL success = WriteFile(PipeHandle, MessageBuffer, *totalLength, nullptr, nullptr);
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if (!success) {
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CloseConnection();
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}
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}
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