Adding AppleJPEGDriver_method_1.cpp

X. NU/custom/drivers/AppleJPEGDriver_method_1.cpp

@@ -0,0 +1,106 @@
+// clang++ -framework IOKit -framework CoreFoundation -framework IOSurface AppleJPEGDriver_method_1.cpp -o AppleJPEGDriver_method_1
+#include <IOKit/IOKitLib.h>
+#include <IOSurface/IOSurface.h>
+#include <stdio.h>
+#include <string.h>
+
+/**
+ * Creates an IOSurface with JPEG format specifications
+ * IOSurface is a memory buffer that can be shared between processes and hardware
+ * @return The unique identifier of the created surface
+ */
+static uint32_t create_surface(void) {
+    // Create a mutable dictionary to hold surface properties
+    CFMutableDictionaryRef dict = CFDictionaryCreateMutable(NULL, 0, 
+        &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
+    
+    // Define basic surface properties
+    // These values are minimal requirements for JPEG processing
+    int width = 32, height = 32;     // Dimensions of the surface
+    int size = 32768;                // Buffer size in bytes
+    int format = 'JPEG';             // Surface pixel format
+    
+    // Set required surface properties in the dictionary
+    // IOSurfaceIsGlobal: Makes surface accessible system-wide
+    CFDictionarySetValue(dict, CFSTR("IOSurfaceIsGlobal"), kCFBooleanTrue);
+    // Set surface dimensions
+    CFDictionarySetValue(dict, CFSTR("IOSurfaceWidth"), 
+        CFNumberCreate(NULL, kCFNumberSInt32Type, &width));
+    CFDictionarySetValue(dict, CFSTR("IOSurfaceHeight"), 
+        CFNumberCreate(NULL, kCFNumberSInt32Type, &height));
+    // Set buffer size
+    CFDictionarySetValue(dict, CFSTR("IOSurfaceAllocSize"), 
+        CFNumberCreate(NULL, kCFNumberSInt32Type, &size));
+    // Set pixel format
+    CFDictionarySetValue(dict, CFSTR("IOSurfacePixelFormat"), 
+        CFNumberCreate(NULL, kCFNumberSInt32Type, &format));
+    
+    // Create the surface and get its ID
+    IOSurfaceRef surface = IOSurfaceCreate(dict);
+    uint32_t id = IOSurfaceGetID(surface);
+    CFRelease(dict);  // Clean up the dictionary
+    return id;
+}
+
+/**
+ * Input structure for the AppleJPEGDriver
+ * This structure defines the parameters needed for JPEG processing operations
+ * Total size: 88 bytes
+ */
+struct AppleJPEGDriverIOStruct {
+    uint32_t src_surface;     // Source IOSurface ID
+    uint32_t input_size;      // Size of input buffer
+    uint32_t dst_surface;     // Destination IOSurface ID
+    uint32_t output_size;     // Size of output buffer
+    uint32_t reserved1[2];    // Reserved fields
+    uint32_t pixelX;         // X dimension in pixels
+    uint32_t pixelY;         // Y dimension in pixels
+    uint32_t reserved2;       // Reserved field
+    uint32_t xOffset;        // X offset for processing
+    uint32_t yOffset;        // Y offset for processing
+    uint32_t subsampling;    // Subsampling mode
+    uint32_t callback;       // Callback function pointer
+    uint32_t reserved3[3];    // Reserved fields
+    uint32_t value100;       // Configuration value
+    uint32_t reserved4[2];    // Reserved fields
+    uint32_t decodeWidth;    // Width for decoding
+    uint32_t decodeHeight;   // Height for decoding
+    uint32_t reserved5;       // Reserved field
+} __attribute__((packed));    // Ensure tight packing of structure
+
+int main() {
+    // Create two IOSurfaces: one for input, one for output
+    uint32_t src = create_surface();
+    uint32_t dst = create_surface();
+    
+    // Establish connection with AppleJPEGDriver
+    io_connect_t conn;
+    IOServiceOpen(IOServiceGetMatchingService(kIOMainPortDefault, 
+        IOServiceMatching("AppleJPEGDriver")), mach_task_self(), 1, &conn);
+
+    // Initialize the driver input structure with desired parameters
+    struct AppleJPEGDriverIOStruct input = {
+        .src_surface = src,          // Source surface ID
+        .dst_surface = dst,          // Destination surface ID
+        .input_size = 2000,          // Input buffer size
+        .output_size = 0x1000,       // Output buffer size
+        .pixelX = 100,               // X dimension
+        .pixelY = 3,                 // Y dimension
+        .xOffset = 0xd,              // X offset
+        .yOffset = 0xff,             // Y offset
+        .value100 = 100,             // Configuration value
+        .decodeWidth = 5,            // Decode width
+        .decodeHeight = 10           // Decode height
+    };
+
+    // Prepare output buffer for driver response
+    char output[65536];
+    size_t output_size = sizeof(output);
+   
+    // Call the driver's method 1 with our input structure
+    kern_return_t kr = IOConnectCallStructMethod(conn, 1, &input, 
+        sizeof(input), output, &output_size);
+   
+    // Print the result of the operation
+    printf("Result: 0x%x (%s)\n", kr, mach_error_string(kr));
+}