Rename bootimgtool to magiskboot

jni/magiskboot/hexpatch.c

@@ -0,0 +1,50 @@
+#include "magiskboot.h"
+
+static int hex2int(char c) {
+	int first = c / 16 - 3;
+	int second = c % 16;
+	int result = first * 10 + second;
+	if(result > 9) result--;
+	return result;
+}
+
+static unsigned hex2ascii(char c, char d) {
+	int high = hex2int(c) * 16;
+	int low = hex2int(d);
+	return high + low;
+}
+
+static void hexstr2str(char *hex, unsigned char *str) {
+	char buf = 0;
+	for(int i = 0, length = strlen(hex); i < length; ++i){
+		if(i % 2){
+			str[i / 2] = hex2ascii(buf, hex[i]);
+		} else{
+			buf = hex[i];
+		}
+	}
+}
+
+void hexpatch(char * image, char *from, char *to) {
+	int fd = open(image, O_RDWR), patternsize = strlen(from) / 2, patchsize = strlen(to) / 2;
+	size_t filesize = lseek(fd, 0, SEEK_END);
+	lseek(fd, 0, SEEK_SET);
+	unsigned char *file, *pattern, *patch;
+	file = mmap(NULL, filesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	pattern = malloc(patternsize);
+	patch = malloc(patchsize);
+	hexstr2str(from, pattern);
+	hexstr2str(to, patch);
+	for (size_t i = 0; i < filesize - patternsize; ++i) {
+		if (memcmp(file + i, pattern, patternsize) == 0) {
+			printf("Pattern %s found!\nPatching to %s\n", from, to);
+			memset(file + i, 0, patternsize);
+			memcpy(file + i, patch, patchsize);
+			i += patternsize - 1;
+		}
+	}
+	munmap(file, filesize);
+	free(pattern);
+	free(patch);
+	close(fd);
+}