Restructure native codebase

native/jni/boot/hexpatch.cpp

@@ -0,0 +1,41 @@
+#include <sys/mman.h>
+
+#include <base.hpp>
+
+#include "magiskboot.hpp"
+
+using namespace std;
+
+static void hex2byte(const char *hex, uint8_t *buf) {
+    char high, low;
+    for (int i = 0, length = strlen(hex); i < length; i += 2) {
+        high = toupper(hex[i]) - '0';
+        low = toupper(hex[i + 1]) - '0';
+        buf[i / 2] = ((high > 9 ? high - 7 : high) << 4) + (low > 9 ? low - 7 : low);
+    }
+}
+
+int hexpatch(const char *file, const char *from, const char *to) {
+    int patched = 1;
+
+    auto m = mmap_data(file, true);
+
+    vector<uint8_t> pattern(strlen(from) / 2);
+    vector<uint8_t> patch(strlen(to) / 2);
+
+    hex2byte(from, pattern.data());
+    hex2byte(to, patch.data());
+
+    uint8_t * const end = m.buf + m.sz;
+    for (uint8_t *curr = m.buf; curr < end; curr += pattern.size()) {
+        curr = static_cast<uint8_t*>(memmem(curr, end - curr, pattern.data(), pattern.size()));
+        if (curr == nullptr)
+            return patched;
+        fprintf(stderr, "Patch @ %08X [%s] -> [%s]\n", (unsigned)(curr - m.buf), from, to);
+        memset(curr, 0, pattern.size());
+        memcpy(curr, patch.data(), patch.size());
+        patched = 0;
+    }
+
+    return patched;
+}