Version 1.08 with public source code release.

src/main/util/patch.h

@@ -0,0 +1,52 @@
+#ifndef UTIL_PATCH_H
+#define UTIL_PATCH_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * Write data to an arbitrary memory location
+ *
+ * @param mem Memory location to write to
+ * @param data Pointer to buffer with data to write
+ * @param len Length of data to write
+ */
+void util_patch_write_memory(uintptr_t mem, const void* data, size_t len);
+
+/**
+ * Write a single byte to an arbitrary memory location
+ *
+ * @param mem Memory location to write to
+ * @param data Byte to write
+ */
+void util_patch_write_memory_byte(uintptr_t mem, uint8_t data);
+
+/**
+ * Write a function ptr/function call to a memory location
+ *
+ * Use this to patch existing call instructions and detour to your own code
+ *
+ * @param func_addr Address of the function/call instruction to replace
+ * @param detour_func Address of your function to detour to
+ */
+void util_patch_function(uintptr_t func_addr, void* detour_func);
+
+/**
+ * Scan a memory area limited by a start and end address for a signiture.
+ *
+ * @param sig Buffer with signiture to search for
+ * @param sig_len Length of signiture
+ * @param sig_offset Offset that gets added to the address where the signiture 
+ *                   starts (if found) 
+ * @param start_addr Pointer to the address to start searching at
+ * @param end_addr Pointer to the address to stop searching at
+ * @param alignment Aligns the search signiture, i.e. search in steps of 
+ *                  X bytes
+ * @return If found, pointer to memory where the signiture was found (first 
+ *         occurance) with the signiture offset added, NULL otherwise
+ */
+void* util_patch_find_signiture(const uint8_t* sig, uint32_t sig_len, 
+    int32_t sig_offset, void* start_addr, void* end_addr, int32_t alignment);
+
+#endif