magiskboot: be clear lzop is not a supported compression format

- keep detection and always display detected format type to fascilitate external support

native/jni/magiskboot/bootimg.cpp

@@ -308,6 +308,7 @@ int unpack(const char *image, bool hdr) {
 		decompress(boot.k_fmt, fd, boot.kernel, boot.hdr->kernel_size);
 		close(fd);
 	} else {
+		fprintf(stderr, "Kernel is uncompressed or not a supported compressed type!\n");
 		dump(boot.kernel, boot.hdr->kernel_size, KERNEL_FILE);
 	}
 
@@ -320,6 +321,7 @@ int unpack(const char *image, bool hdr) {
 		decompress(boot.r_fmt, fd, boot.ramdisk, boot.hdr->ramdisk_size);
 		close(fd);
 	} else {
+		fprintf(stderr, "Ramdisk is uncompressed or not a supported compressed type!\n");
 		dump(boot.ramdisk, boot.hdr->ramdisk_size, RAMDISK_FILE);
 	}
 

native/jni/magiskboot/compress.cpp

@@ -33,11 +33,13 @@ void decompress(char *infile, const char *outfile) {
 	read_file(in_file, [&](void *buf, size_t len) -> void {
 		if (out_fd < 0) {
 			format_t type = check_fmt(buf, len);
+
+			fprintf(stderr, "Detected format: [%s]\n", fmt2name[type]);
+
 			if (!COMPRESSED(type))
-				LOGE("Input file is not a compressed type!\n");
+				LOGE("Input file is not a supported compressed type!\n");
 
 			cmp.reset(get_decoder(type));
-			fprintf(stderr, "Detected format: [%s]\n", fmt2name[type]);
 
 			/* If user does not provide outfile, infile has to be either
 	 		* <path>.[ext], or '-'. Outfile will be either <path> or '-'.

native/jni/magiskboot/format.cpp

@@ -89,7 +89,7 @@ const char *Fmt2Ext::operator[](format_t fmt) {
 		case GZIP:
 			return ".gz";
 		case LZOP:
-			return ".lzop";
+			return ".lzo";
 		case XZ:
 			return ".xz";
 		case LZMA:

native/jni/magiskboot/format.h

@@ -17,8 +17,9 @@ typedef enum {
 	BZIP2,
 	LZ4,
 	LZ4_LEGACY,
-/* Misc */
+/* Unsupported compression */
 	LZOP,
+/* Misc */
 	MTK,
 	DTB,
 } format_t;