+ local memory as shared memory

+ getters/setters

CMakeLists.txt

@@ -22,7 +22,7 @@ file(GLOB_RECURSE TESTS test/*.cpp)
 include_directories(src)
 include_directories(test)
 
-add_library(library ${SOURCES} ${HEADERS})
+add_library(library ${SOURCES} ${HEADERS} src/FontType.cpp)
 
 file(COPY "${CMAKE_SOURCE_DIR}/src/"
         DESTINATION "${CMAKE_SOURCE_DIR}/include"

src/Color.cpp

@@ -6,3 +6,27 @@ Color::Color(unsigned char red, unsigned char green, unsigned char blue)
 
 }
 
+unsigned char Color::getRed() {
+    return red;
+}
+
+unsigned char Color::getGreen() {
+    return green;
+}
+
+unsigned char Color::getBlue() {
+    return blue;
+}
+
+void Color::setRed(unsigned char value) {
+    red = value;
+}
+
+void Color::setGreen(unsigned char value) {
+    green = value;
+}
+
+void Color::setBlue(unsigned char value) {
+    blue = value;
+}
+

src/Color.h

@@ -17,6 +17,14 @@ private:
 public:
     Color(unsigned char red, unsigned char green, unsigned char blue);
 
+    unsigned char getRed();
+    unsigned char getGreen();
+    unsigned char getBlue();
+
+    void setRed(unsigned char value);
+    void setGreen(unsigned char value);
+    void setBlue(unsigned char value);
+
 };
 
 const static Color black = Color(0, 0, 0);

src/FontType.cpp

@@ -0,0 +1,18 @@
+#include "FontType.h"
+
+
+FontType::FontType() {
+
+}
+
+std::string FontType::getName() {
+    return std::__cxx11::string();
+}
+
+int FontType::getHeight() {
+    return 0;
+}
+
+int FontType::getWidth() {
+    return 0;
+}

src/FontType.h

@@ -1,12 +1,12 @@
 #ifndef LIBRARY_FONT_H
 #define LIBRARY_FONT_H
 
+#include <string>
 
-class Font {
-private:
-    Font();
-
+class FontType {
 public:
+    FontType();
+
     std::string getName();
     int getHeight();
     int getWidth();

src/SharedMemoryAccess.cpp

@@ -24,7 +24,9 @@
 int semId;
 struct sembuf semaphore;
 
-int initSemaphore (void) {
+std::vector<char> localSharedMemory;
+
+int initSemaphore () {
     /* Testen, ob das Semaphor bereits existiert */
     semId = semget (SEM_KEY, 0, IPC_PRIVATE);
     if (semId < 0) {
@@ -44,11 +46,11 @@ int initSemaphore (void) {
 }
 
 int semaphoreOperation (int op) {
-    semaphore.sem_op = op;
+    semaphore.sem_op = (short)op;
     semaphore.sem_flg = SEM_UNDO;
     if( semop (semId, &semaphore, 1) == -1) {
         perror(" semop ");
-        exit (EXIT_FAILURE);
+        return -1;
     }
     return 1;
 }
@@ -56,7 +58,7 @@ int semaphoreOperation (int op) {
 void writeSharedMemory(char *data, int size, int offset) {
     int shmId = shmget(impl.sharedMemoryKey, NULL, 0); // dont init just get the ID if already existing.
     if(shmId < 0 ) {
-        exit(EXIT_FAILURE);
+        return;
         /* we could return -1, not sure if it will be useful to continue after there is no shm allocated for any reason*/
     } else {
         char *shm_pointer = (char *) shmat(shmId, NULL, 0);
@@ -66,12 +68,34 @@ void writeSharedMemory(char *data, int size, int offset) {
     }
 }
 
-const char* getSharedMemory() {
+char* getSharedMemory() {
+    /*
     int shmId = shmget(impl.sharedMemoryKey, NULL, 0);
     if(shmId < 0) {
-        exit(EXIT_FAILURE);
-        /* we could return -1, not sure if it will be useful to continue after there is no shm allocated for any reason*/
+        return nullptr;
+        // we could return -1, not sure if it will be useful to continue after there is no shm allocated for any reason
     } else {
         return (char *) shmat(shmId, NULL, 0);
     }
-}
+    */
+
+    //using a local buffer for shared memory testing
+    if(localSharedMemory.empty()){
+        initSemaphore();
+        localSharedMemory.resize(impl.sharedMemorySize * 1024);
+    }
+
+    return &localSharedMemory[0];
+}
+
+int getSharedMemorySize() {
+    return impl.sharedMemorySize;
+}
+
+void lockSharedMemory() {
+    semaphoreOperation(LOCK);
+}
+
+void unlockSharedMemory() {
+    semaphoreOperation(UNLOCK);
+}

src/SharedMemoryAccess.h

@@ -7,10 +7,10 @@
 
 
 /**
- * only to read the shared memory
+ * use lock and unlock when writing
  * @return pointer to the shared memory
  */
-const char *getSharedMemory();
+char *getSharedMemory();
 
 /**
  *
@@ -18,6 +18,10 @@ const char *getSharedMemory();
  */
 int getSharedMemorySize();
 
+void lockSharedMemory();
+
+void unlockSharedMemory();
+
 /**
  *
  * @param data poiter to data

src/internal.cpp

@@ -1,9 +1,10 @@
 #include "internal.h"
+#include "SharedMemoryAccess.h"
+#include "vkvm.h"
+
 #include <sys/shm.h>
 #include <csignal>
 
-#include "SharedMemoryAccess.h"
-
 Impl impl;
 
 void sendSignal(pid_t pid, int signalNumber) {
@@ -15,7 +16,22 @@ void onSignal(int signalNumber, void(*callback)(int)) {
 }
 
 InterruptEntry *getInterrupTable(){
-    return (InterruptEntry*)((char*)getSharedMemory() + sizeof(Registers) + 1024/*reserved*/);
+    return (InterruptEntry*)(getSharedMemory() + sizeof(Registers) + impl.reservedSize);
+}
+
+Registers *getRegisters(){
+    return (Registers*)getSharedMemory();
+}
+
+char *getTextArea(){
+    return ((getSharedMemory() + sizeof(Registers) + impl.reservedSize) +
+    sizeof(InterruptEntry) * impl.interruptEntyCount);
+}
+
+char *getPixelArea(){
+    return (((getSharedMemory() + sizeof(Registers) + impl.reservedSize) +
+    sizeof(InterruptEntry) * impl.interruptEntyCount) +
+    getCharactersPerRow() *  getCharactersPerColumn());
 }
 
 bool callEvent(EventType type) {
@@ -25,3 +41,32 @@ bool callEvent(EventType type) {
     }
     return true;
 }
+
+void setLayoutVersion(LayoutVersion newValue) {
+    lockSharedMemory();
+    getRegisters()->layout_version = newValue;
+    unlockSharedMemory();
+}
+
+void setCharactersPerColumn(int newValue) {
+    lockSharedMemory();
+    getRegisters()->characters_per_column = newValue;
+    unlockSharedMemory();
+}
+
+void setCharactersPerRow(int newValue) {
+    lockSharedMemory();
+    getRegisters()->characters_per_row = newValue;
+    unlockSharedMemory();
+}
+
+void setMousePosition(int x, int y) {
+    lockSharedMemory();
+    getRegisters()->mouse_pos_x = x;
+    getRegisters()->mouse_pos_y = y;
+    unlockSharedMemory();
+}
+
+void buttonPressed(KeyCode keyCode) {
+    //TODO
+}

src/internal.h

@@ -50,6 +50,7 @@ struct Impl {
     key_t sharedMemoryKey;
     int sharedMemorySize;
     int interruptEntyCount = 64;
+    int reservedSize = 1024;
     std::vector<std::function<void()>> eventTable;
 };
 
@@ -70,6 +71,10 @@ void onSignal(int signalNumber, void(*callback)(int));
 
 
 InterruptEntry *getInterrupTable();
+Registers *getRegisters();
+char *getTextArea();
+char *getPixelArea();
+
 
 /**
  * set layout version.
@@ -78,10 +83,10 @@ InterruptEntry *getInterrupTable();
 void setLayoutVersion(LayoutVersion newValue);
 
 /**
- * set characters per line for current font.
- * @param newValue characters per line.
+ * set characters per column for current font.
+ * @param newValue characters per column.
  */
-void setCharactersPerLine(int newValue);
+void setCharactersPerColumn(int newValue);
 
 /**
  * set characters per row for current font.

src/vkvm.cpp

@@ -1,21 +1,36 @@
 #include "vkvm.h"
 #include "internal.h"
+#include "SharedMemoryAccess.h"
+
 #include <unistd.h>
 #include <csignal>
 
 void initialize(int pid) {
     impl.sharedMemoryPid = pid;
     impl.sharedMemoryKey = 12345;
-    impl.sharedMemorySize = 0;
+    impl.sharedMemorySize = 8000;
+
+    //set default values
+    setCharactersPerRow(60);
+    setCharactersPerColumn(20);
+    setHeight(600);
+    setWidth(800);
+    setMousePosition(42,42);
+    setBackgroundColor(Color(200,50,20));
+    setForegroundColor(Color(20,200,50));
+    setMode(GraphicMode::TrueColor);
+    setRedrawInterval(20);
+    setTimerInterruptInterval(10);
 }
 
 bool registerEvent(EventType type, std::function<void()> handler) {
     int signum = SIGUSR1 + impl.eventTable.size();
-
     auto ivt = getInterrupTable();
+
+    lockSharedMemory();
+
     ivt[type].pid = getpid();
     ivt[type].signum = signum;
-
     impl.eventTable.push_back(handler);
 
     onSignal(signum, [](int sig){
@@ -26,5 +41,149 @@ bool registerEvent(EventType type, std::function<void()> handler) {
         }
     });
 
+    unlockSharedMemory();
+
     return true;
 }
+
+bool setPixel(int x, int y, Color color) {
+    char *ptr = getPixelArea() + (y * getWidth() + x) * 3;
+    ptr[0] = color.getRed();
+    ptr[1] = color.getGreen();
+    ptr[2] = color.getBlue();
+    return false;
+}
+
+Color getPixel(int x, int y) {
+    //TODO: other than RGB colores
+    //only RGB colores for now
+    unsigned char *ptr = (unsigned char *)getPixelArea() + (y * getWidth() + x) * 3;
+    return Color(ptr[0], ptr[1], ptr[2]);
+}
+
+bool setText(std::string text) {
+    lockSharedMemory();
+    char *ptr = getTextArea();
+    for(int i = 0; i < text.size();i++){
+        if(i >= getCharactersPerColumn() * getCharactersPerRow()){
+            break;
+        }
+        ptr[i] = text[i];
+    }
+    if(text.size() < getCharactersPerColumn() * getCharactersPerRow()){
+        ptr[text.size()] = '\0';
+    }
+    unlockSharedMemory();
+    return true;
+}
+
+std::string getText() {
+    return std::string (getTextArea());
+}
+
+LayoutVersion getLayoutVersion() {
+    return (LayoutVersion)getRegisters()->layout_version;
+}
+
+void reset() {
+    //TODO
+}
+
+int getWidth() {
+    return getRegisters()->width_pixels;
+}
+
+void setWidth(int newValue) {
+    lockSharedMemory();
+    getRegisters()->width_pixels = newValue;
+    unlockSharedMemory();
+}
+
+int getHeight() {
+    return getRegisters()->height_pixels;
+}
+
+void setHeight(int newValue) {
+    lockSharedMemory();
+    getRegisters()->height_pixels = newValue;
+    unlockSharedMemory();
+}
+
+GraphicMode getMode() {
+    return getRegisters()->graphicMode;
+}
+
+void setMode(GraphicMode newValue) {
+    lockSharedMemory();
+    getRegisters()->graphicMode = newValue;
+    unlockSharedMemory();
+}
+
+int getRedrawInterval() {
+    return getRegisters()->autoRedrawInterval;
+}
+
+void setRedrawInterval(int newValue) {
+    lockSharedMemory();
+    getRegisters()->autoRedrawInterval = newValue;
+    unlockSharedMemory();
+}
+
+int getTimerInterruptInterval() {
+    return getRegisters()->timerInterruptInterval;
+}
+
+void setTimerInterruptInterval(int newValue) {
+    lockSharedMemory();
+    getRegisters()->timerInterruptInterval = newValue;
+    unlockSharedMemory();
+}
+
+Color getBackgroundColor() {
+    return getRegisters()->background_color;
+}
+
+void setBackgroundColor(Color newValue) {
+    lockSharedMemory();
+    getRegisters()->background_color = newValue;
+    unlockSharedMemory();
+}
+
+Color getForegroundColor() {
+    return getRegisters()->foreground_color;
+}
+
+void setForegroundColor(Color newValue) {
+    lockSharedMemory();
+    getRegisters()->foreground_color = newValue;
+    unlockSharedMemory();
+}
+
+int getCharactersPerRow() {
+    return getRegisters()->characters_per_row;
+}
+
+int getCharactersPerColumn() {
+    return getRegisters()->characters_per_column;
+}
+
+FontType getFont() {
+    //TODO
+    return FontType();
+}
+
+void setFont(FontType newValue) {
+    //TODO
+    lockSharedMemory();
+    getRegisters()->textMode_font = 0;
+    unlockSharedMemory();
+}
+
+std::pair<int, int> getMousePosition() {
+    return {getRegisters()->mouse_pos_x, getRegisters()->mouse_pos_y};
+}
+
+KeyCode getLastPressedKey() {
+    //TODO
+    return KeyCode(0);
+}

src/vkvm.h

@@ -6,7 +6,7 @@
 #include "Color.h"
 #include "EventType.h"
 #include "GraphicMode.h"
-#include "Font.h"
+#include "FontType.h"
 #include "KeyCode.h"
 #include "LayoutVersion.h"
 
@@ -178,13 +178,13 @@ int getCharactersPerColumn();
  * get currently used font in text mode.
  * @return currently used font.
  */
-Font getFont();
+FontType getFont();
 
 /**
  * set text mode font.
  * @param newValue new text mode font.
  */
-void setFont(Font newValue);
+void setFont(FontType newValue);
 
 /**
  * get current mouse position