Only compress kernel and ramdisk if input not compressed

native/jni/magiskboot/bootimg.cpp

@@ -1,8 +1,11 @@
+#include <sys/mman.h>
+#include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <libfdt.h>
-#include <sys/mman.h>
+#include <functional>
+#include <memory>
 
 #include <mincrypt/sha.h>
 #include <mincrypt/sha256.h>
@@ -13,9 +16,26 @@
 #include "magiskboot.h"
 #include "compress.h"
 
+using namespace std;
+
 uint32_t dyn_img_hdr::j32 = 0;
 uint64_t dyn_img_hdr::j64 = 0;
 
+static int64_t one_step(unique_ptr<Compression> &&ptr, int fd, const void *in, size_t size) {
+	ptr->set_out(make_unique<FDOutStream>(fd));
+	if (!ptr->write(in, size))
+		return -1;
+	return ptr->finalize();
+}
+
+static int64_t decompress(format_t type, int fd, const void *in, size_t size) {
+	return one_step(unique_ptr<Compression>(get_decoder(type)), fd, in, size);
+}
+
+static int64_t compress(format_t type, int fd, const void *in, size_t size) {
+	return one_step(unique_ptr<Compression>(get_encoder(type)), fd, in, size);
+}
+
 static void dump(void *buf, size_t size, const char *filename) {
 	if (size == 0)
 		return;
@@ -329,15 +349,15 @@ void repack(const char* orig_image, const char* out_image) {
 		write_zero(fd, 512);
 	}
 	if (access(KERNEL_FILE, R_OK) == 0) {
-		if (COMPRESSED(boot.k_fmt)) {
 		size_t raw_size;
-			void *kernel_raw;
+		void *raw_buf;
-			mmap_ro(KERNEL_FILE, kernel_raw, raw_size);
+		mmap_ro(KERNEL_FILE, raw_buf, raw_size);
-			boot.hdr->kernel_size = compress(boot.k_fmt, fd, kernel_raw, raw_size);
+		if (!COMPRESSED(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.k_fmt)) {
-			munmap(kernel_raw, raw_size);
+			boot.hdr->kernel_size = compress(boot.k_fmt, fd, raw_buf, raw_size);
 		} else {
-			boot.hdr->kernel_size = restore(KERNEL_FILE, fd);
+			boot.hdr->kernel_size = write(fd, raw_buf, raw_size);
 		}
+		munmap(raw_buf, raw_size);
 	}
 
 	// dtb
@@ -352,15 +372,15 @@ void repack(const char* orig_image, const char* out_image) {
 		write_zero(fd, 512);
 	}
 	if (access(RAMDISK_FILE, R_OK) == 0) {
-		if (COMPRESSED(boot.r_fmt)) {
+		size_t raw_size;
-			size_t cpio_size;
+		void *raw_buf;
-			void *cpio;
+		mmap_ro(RAMDISK_FILE, raw_buf, raw_size);
-			mmap_ro(RAMDISK_FILE, cpio, cpio_size);
+		if (!COMPRESSED(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.r_fmt)) {
-			boot.hdr->ramdisk_size = compress(boot.r_fmt, fd, cpio, cpio_size);
+			boot.hdr->ramdisk_size = compress(boot.r_fmt, fd, raw_buf, raw_size);
-			munmap(cpio, cpio_size);
 		} else {
-			boot.hdr->ramdisk_size = restore(RAMDISK_FILE, fd);
+			boot.hdr->ramdisk_size = write(fd, raw_buf, raw_size);
 		}
+		munmap(raw_buf, raw_size);
 		file_align();
 	}
 

native/jni/magiskboot/compress.cpp

@@ -14,14 +14,6 @@
 
 using namespace std;
 
-int64_t decompress(format_t type, int fd, const void *from, size_t size) {
-	return unique_ptr<Compression>(get_decoder(type))->one_step(fd, from, size);
-}
-
-int64_t compress(format_t type, int fd, const void *from, size_t size) {
-	return unique_ptr<Compression>(get_encoder(type))->one_step(fd, from, size);
-}
-
 static bool read_file(FILE *fp, const function<void (void *, size_t)> &fn) {
 	char buf[4096];
 	size_t len;
@@ -164,13 +156,6 @@ Compression *get_decoder(format_t type) {
 	}
 }
 
-int64_t Compression::one_step(int outfd, const void *in, size_t size) {
-	set_out(make_unique<FDOutStream>(outfd));
-	if (!write(in, size))
-		return -1;
-	return finalize();
-}
-
 GZStream::GZStream(int mode) : mode(mode), strm({}) {
 	switch(mode) {
 		case 0:

native/jni/magiskboot/compress.h

@@ -14,7 +14,6 @@
 
 class Compression : public FilterOutStream {
 public:
-	int64_t one_step(int outfd, const void *in, size_t size);
 	virtual uint64_t finalize() = 0;
 };
 
@@ -171,7 +170,5 @@ private:
 
 Compression *get_encoder(format_t type);
 Compression *get_decoder(format_t type);
-int64_t compress(format_t type, int fd, const void *from, size_t size);
-int64_t decompress(format_t type, int fd, const void *from, size_t size);
 void compress(const char *method, const char *infile, const char *outfile);
 void decompress(char *infile, const char *outfile);

native/jni/magiskboot/format.h

@@ -1,5 +1,4 @@
-#ifndef _FORMAT_H_
+#pragma once
-#define _FORMAT_H_
 
 #include <map>
 #include <string_view>
@@ -50,9 +49,6 @@ typedef enum {
 #define ACCLAIM_MAGIC   "BauwksBoot"
 #define ACCLAIM_PRE_HEADER_SZ 262144
 
-#define SUP_LIST      ((const char *[]) { "gzip", "xz", "lzma", "bzip2", "lz4", "lz4_legacy", NULL })
-#define SUP_EXT_LIST  ((const char *[]) { "gz", "xz", "lzma", "bz2", "lz4", "lz4", NULL })
-
 class Fmt2Name {
 public:
 	const char *operator[](format_t fmt);
@@ -68,5 +64,3 @@ format_t check_fmt(const void *buf, size_t len);
 extern std::map<std::string_view, format_t> name2fmt;
 extern Fmt2Name fmt2name;
 extern Fmt2Ext fmt2ext;
-
-#endif

native/jni/magiskboot/main.cpp

@@ -14,20 +14,21 @@
 
 static void usage(char *arg0) {
 	fprintf(stderr,
+		FULL_VER(MagiskBoot) " - Boot Image Modification Tool\n"
 		"Usage: %s <action> [args...]\n"
 		"\n"
 		"Supported actions:\n"
 		"  --unpack <bootimg>\n"
-		"    Unpack <bootimg> to kernel, ramdisk.cpio, and if available, second, dtb,\n"
+		"    Unpack <bootimg> to, if available, kernel, ramdisk.cpio, \n"
-		"    and extra into the current directory. Return values:\n"
+		"    second, dtb, extra, and recovery_dtbo into current directory.\n"
+		"    Return values:\n"
 		"    0:valid    1:error    2:chromeos    3:ELF32    4:ELF64\n"
 		"\n"
 		"  --repack <origbootimg> [outbootimg]\n"
-		"    Repack kernel, ramdisk.cpio[.ext], second, dtb... from current directory\n"
+		"    Repack boot image components from current directory\n"
 		"    to [outbootimg], or new-boot.img if not specified.\n"
-		"    It will compress ramdisk.cpio with the same method used in <origbootimg>,\n"
+		"    It will compress ramdisk.cpio and kernel with the same method in\n"
-		"    or attempt to find ramdisk.cpio.[ext], and repack directly with the\n"
+		"    <origbootimg> if the file provided is not already compressed.\n"
-		"    compressed ramdisk file\n"
 		"\n"
 		"  --hexpatch <file> <hexpattern1> <hexpattern2>\n"
 		"    Search <hexpattern1> in <file>, and replace with <hexpattern2>\n"
@@ -80,16 +81,16 @@ static void usage(char *arg0) {
 		"    <infile>/[outfile] can be '-' to be STDIN/STDOUT\n"
 		"    Supported methods: "
 	, arg0);
-	for (int i = 0; SUP_LIST[i]; ++i)
+	for (auto &it : name2fmt)
-		fprintf(stderr, "%s ", SUP_LIST[i]);
+		fprintf(stderr, "%s ", it.first.data());
 	fprintf(stderr,
 		"\n\n"
 		"  --decompress <infile> [outfile]\n"
 		"    Detect method and decompress <infile>, optionally to [outfile]\n"
 		"    <infile>/[outfile] can be '-' to be STDIN/STDOUT\n"
 		"    Supported methods: ");
-	for (int i = 0; SUP_LIST[i]; ++i)
+	for (auto &it : name2fmt)
-		fprintf(stderr, "%s ", SUP_LIST[i]);
+		fprintf(stderr, "%s ", it.first.data());
 	fprintf(stderr,
 		"\n\n"
 		"  --sha1 <file>\n"
@@ -104,31 +105,24 @@ static void usage(char *arg0) {
 
 int main(int argc, char *argv[]) {
 	cmdline_logging();
-	fprintf(stderr, FULL_VER(MagiskBoot) " - Boot Image Modification Tool\n");
-
 	umask(0);
+
 	if (argc > 1 && strcmp(argv[1], "--cleanup") == 0) {
 		fprintf(stderr, "Cleaning up...\n");
-		char name[PATH_MAX];
 		unlink(KERNEL_FILE);
 		unlink(RAMDISK_FILE);
-		unlink(RAMDISK_FILE ".raw");
 		unlink(SECOND_FILE);
 		unlink(DTB_FILE);
 		unlink(EXTRA_FILE);
 		unlink(RECV_DTBO_FILE);
-		for (int i = 0; SUP_EXT_LIST[i]; ++i) {
-			sprintf(name, "%s.%s", RAMDISK_FILE, SUP_EXT_LIST[i]);
-			unlink(name);
-		}
 	} else if (argc > 2 && strcmp(argv[1], "--sha1") == 0) {
 		uint8_t sha1[SHA_DIGEST_SIZE];
 		void *buf;
 		size_t size;
 		mmap_ro(argv[2], buf, size);
 		SHA_hash(buf, size, sha1);
-		for (int i = 0; i < SHA_DIGEST_SIZE; ++i)
+		for (uint8_t i : sha1)
-			printf("%02x", sha1[i]);
+			printf("%02x", i);
 		printf("\n");
 		munmap(buf, size);
 	} else if (argc > 2 && strcmp(argv[1], "--unpack") == 0) {