mirror of
https://github.com/Karmaz95/Snake_Apple.git
synced 2026-04-01 14:10:12 +02:00
106 lines
4.5 KiB
C++
106 lines
4.5 KiB
C++
// clang++ -framework IOKit -framework CoreFoundation -framework IOSurface AppleJPEGDriver_method_1.cpp -o AppleJPEGDriver_method_1
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#include <IOKit/IOKitLib.h>
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#include <IOSurface/IOSurface.h>
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#include <stdio.h>
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#include <string.h>
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/**
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* Creates an IOSurface with JPEG format specifications
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* IOSurface is a memory buffer that can be shared between processes and hardware
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* @return The unique identifier of the created surface
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*/
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static uint32_t create_surface(void) {
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// Create a mutable dictionary to hold surface properties
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CFMutableDictionaryRef dict = CFDictionaryCreateMutable(NULL, 0,
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&kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
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// Define basic surface properties
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// These values are minimal requirements for JPEG processing
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int width = 32, height = 32; // Dimensions of the surface
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int size = 32768; // Buffer size in bytes
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int format = 'JPEG'; // Surface pixel format
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// Set required surface properties in the dictionary
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// IOSurfaceIsGlobal: Makes surface accessible system-wide
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CFDictionarySetValue(dict, CFSTR("IOSurfaceIsGlobal"), kCFBooleanTrue);
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// Set surface dimensions
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CFDictionarySetValue(dict, CFSTR("IOSurfaceWidth"),
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CFNumberCreate(NULL, kCFNumberSInt32Type, &width));
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CFDictionarySetValue(dict, CFSTR("IOSurfaceHeight"),
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CFNumberCreate(NULL, kCFNumberSInt32Type, &height));
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// Set buffer size
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CFDictionarySetValue(dict, CFSTR("IOSurfaceAllocSize"),
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CFNumberCreate(NULL, kCFNumberSInt32Type, &size));
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// Set pixel format
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CFDictionarySetValue(dict, CFSTR("IOSurfacePixelFormat"),
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CFNumberCreate(NULL, kCFNumberSInt32Type, &format));
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// Create the surface and get its ID
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IOSurfaceRef surface = IOSurfaceCreate(dict);
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uint32_t id = IOSurfaceGetID(surface);
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CFRelease(dict); // Clean up the dictionary
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return id;
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}
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/**
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* Input structure for the AppleJPEGDriver
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* This structure defines the parameters needed for JPEG processing operations
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* Total size: 88 bytes
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*/
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struct AppleJPEGDriverIOStruct {
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uint32_t src_surface; // Source IOSurface ID
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uint32_t input_size; // Size of input buffer
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uint32_t dst_surface; // Destination IOSurface ID
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uint32_t output_size; // Size of output buffer
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uint32_t reserved1[2]; // Reserved fields
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uint32_t pixelX; // X dimension in pixels
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uint32_t pixelY; // Y dimension in pixels
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uint32_t reserved2; // Reserved field
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uint32_t xOffset; // X offset for processing
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uint32_t yOffset; // Y offset for processing
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uint32_t subsampling; // Subsampling mode
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uint32_t callback; // Callback function pointer
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uint32_t reserved3[3]; // Reserved fields
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uint32_t value100; // Configuration value
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uint32_t reserved4[2]; // Reserved fields
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uint32_t decodeWidth; // Width for decoding
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uint32_t decodeHeight; // Height for decoding
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uint32_t reserved5; // Reserved field
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} __attribute__((packed)); // Ensure tight packing of structure
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int main() {
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// Create two IOSurfaces: one for input, one for output
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uint32_t src = create_surface();
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uint32_t dst = create_surface();
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// Establish connection with AppleJPEGDriver
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io_connect_t conn;
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IOServiceOpen(IOServiceGetMatchingService(kIOMainPortDefault,
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IOServiceMatching("AppleJPEGDriver")), mach_task_self(), 1, &conn);
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// Initialize the driver input structure with desired parameters
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struct AppleJPEGDriverIOStruct input = {
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.src_surface = src, // Source surface ID
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.dst_surface = dst, // Destination surface ID
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.input_size = 2000, // Input buffer size
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.output_size = 0x1000, // Output buffer size
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.pixelX = 100, // X dimension
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.pixelY = 3, // Y dimension
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.xOffset = 0xd, // X offset
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.yOffset = 0xff, // Y offset
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.value100 = 100, // Configuration value
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.decodeWidth = 5, // Decode width
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.decodeHeight = 10 // Decode height
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};
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// Prepare output buffer for driver response
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char output[65536];
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size_t output_size = sizeof(output);
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// Call the driver's method 1 with our input structure
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kern_return_t kr = IOConnectCallStructMethod(conn, 1, &input,
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sizeof(input), output, &output_size);
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// Print the result of the operation
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printf("Result: 0x%x (%s)\n", kr, mach_error_string(kr));
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} |