--- /dev/null
+CFLAGS = -O2 -Wall
+
+unyaffs: unyaffs.c unyaffs.h
+ $(CC) $(CFLAGS) $(LDFLAGS) unyaffs.c -o unyaffs
--- /dev/null
+unyaffs
+=======
+
+Overview
+--------
+
+ Unyaffs is a program to extract files from a YAFFS2 file system image.
+ Currently it can only extract images created by mkyaffs2image.
+
+ Unyaffs is based on work of the YAFFS project, see http://www.yaffs.net/
+
+ The original implementation was done by Kai Wei <kai.wei.cn@gmail.com>,
+ it is available at http://code.google.com/p/unyaffs/
+
+ As the project was inactive, Bernhard Ehlers <be@bernhard-ehlers.de>
+ started a fork at https://github.com/ehlers/unyaffs
+
+
+License
+-------
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License version 2 as
+ published by the Free Software Foundation.
+
+ The full license text is available in the file gpl-2.0.txt.
+
+
+Requirements
+------------
+
+ Unyaffs should run on most unix-like operating systems.
+ A C compiler environment and make is neccessary to compile it.
+
+
+Compiling
+---------
+
+ type "make"
+
+
+Usage
+-----
+
+ unyaffs extracts all the files from a YAFFS2 file system image.
+
+ unyaffs [-l <layout>] [-t] [-v] [-V] <image_file_name> [<base dir>]
+ -l <layout> set flash memory layout
+ layout=0: detect chunk and spare size (default)
+ layout=1: 2K chunk, 64 byte spare size
+ layout=2: 4K chunk, 128 byte spare size
+ layout=3: 8K chunk, 256 byte spare size
+ layout=4: 16K chunk, 512 byte spare size
+ -t list image contents
+ -v verbose output
+ -V print version
+
+ In most cases the flash memory layout is detected automatically.
+ If the detection doesn't work properly, the layout can be set with
+ option -l.
+
+ Option -t lists all the file names in the image without extracting them.
+ Option -v generates a 'ls -l' like listing of the extracted files.
+ When combined with -t it generates an extended file listing, nothing
+ is extracted.
+
+ The image file can be - for standard input.
+
+ If the base directory is not given, the filea are extracted into the
+ current directory. If the base dir doesn't exist, it will be created.
+
+ unyaffs extracts all file types (regular files, directories, soft links,
+ hard links and special files). The permissions and modification dates
+ are restored. When run as root, the ownership is restored as well.
+
+ Please be careful extracting images as root. It might be possible,
+ that important system files get overwritten. The use of chroot
+ or fakeroot can guard against these problems.
+
+Limitations
+-----------
+
+ Block and character devices can only be restored as root. In some
+ operating systems (e.g. Mac OS X) sockets can't be restored.
+
+ The use of special files (block devices, character devices, pipes,
+ sockets) is not portable across different unix flavors. E.g. device
+ files created on linux will get a strange major and minor device id,
+ when restored under BSD.
+
+ When it's necessary to deal with special files, please use the same
+ OS as used in the system the image is build for. In most cases that's
+ linux.
+
+Windows
+-------
+
+ The differences between the unix and windows file system are big enough
+ to make a windows port of unyaffs a complicated task. But with cygwin
+ (http://www.cygwin.com/) a unix compatibility layer for windows is
+ available. The unmodified source compiles and runs nicely within cygwin.
+
+ The main differences to a pure unix environment:
+ - Unix functionality only within cygwin environment, native windows
+ programs won't see the more advanced features.
+ - Permissions and file dates/time are correctly restored
+ - Owner/group are not fully restored, only user/groups available in windows
+ - Hard and soft links are correctly restored
+ - Device files have different ids as in linux
+ - Sockets are not restored
+
+ For analysis of a firmware image, unyaffs within cygwin is a nice tool,
+ but because of the restricted user/group functionality rebuilding a
+ modified image can't be recommended.
--- /dev/null
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
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+License is intended to guarantee your freedom to share and change free
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+Foundation's software and to any other program whose authors commit to
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+
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+
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+
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+
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+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+
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+ (at your option) any later version.
+
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+ Gnomovision version 69, Copyright (C) year name of author
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+ This is free software, and you are welcome to redistribute it
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+
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+
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+
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+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
--- /dev/null
+#!/usr/bin/env python3
+"""
+测试脚本：验证 mkyaffs2image 打包和 unyaffs 解包功能
+
+该脚本会：
+1. 使用两个版本的 mkyaffs2image（新版本和旧版本）分别将 res 目录打包成 YAFFS2 镜像
+2. 使用 unyaffs 解包两个版本的镜像到临时目录
+3. 验证解包后的文件是否与原始文件一致
+
+注意：
+- 新版本 mkyaffs2image：支持 summary chunks
+- 旧版本 mkyaffs2image_old：不支持 summary chunks
+- unyaffs 应该能够自动检测并兼容两个版本的镜像格式
+- 脚本会尝试多种 pagesize 和 ecctype 组合
+"""
+
+import os
+import sys
+import subprocess
+import shutil
+import tempfile
+import filecmp
+from pathlib import Path
+
+
+class Colors:
+ """终端颜色输出"""
+ GREEN = '\033[92m'
+ RED = '\033[91m'
+ YELLOW = '\033[93m'
+ BLUE = '\033[94m'
+ RESET = '\033[0m'
+ BOLD = '\033[1m'
+
+
+def print_success(msg):
+ """打印成功消息"""
+ print(f"{Colors.GREEN}✓{Colors.RESET} {msg}")
+
+
+def print_error(msg):
+ """打印错误消息"""
+ print(f"{Colors.RED}✗{Colors.RESET} {msg}")
+
+
+def print_info(msg):
+ """打印信息消息"""
+ print(f"{Colors.BLUE}ℹ{Colors.RESET} {msg}")
+
+
+def print_warning(msg):
+ """打印警告消息"""
+ print(f"{Colors.YELLOW}⚠{Colors.RESET} {msg}")
+
+
+def check_tool(tool_path, tool_name):
+ """检查工具是否存在且可执行"""
+ if not os.path.exists(tool_path):
+ print_error(f"{tool_name} 不存在: {tool_path}")
+ return False
+ if not os.access(tool_path, os.X_OK):
+ print_error(f"{tool_name} 不可执行: {tool_path}")
+ return False
+ print_success(f"找到 {tool_name}: {tool_path}")
+ return True
+
+
+def run_command(cmd, description, suppress_output=False):
+ """运行命令并检查结果"""
+ print_info(f"执行: {description}")
+ if not suppress_output:
+ print_info(f"命令: {' '.join(cmd)}")
+
+ try:
+ result = subprocess.run(
+ cmd,
+ capture_output=True,
+ text=True,
+ check=True
+ )
+ if result.stdout and not suppress_output:
+ # 对于 mkyaffs2image，只显示最后几行
+ lines = result.stdout.strip().split('\n')
+ if len(lines) > 10:
+ print_info("... (输出已截断)")
+ for line in lines[-5:]:
+ print(f" {line}")
+ else:
+ print(result.stdout)
+ return True, result.stdout
+ except subprocess.CalledProcessError as e:
+ print_error(f"命令执行失败: {description}")
+ if e.stdout:
+ # 只显示最后几行错误输出
+ lines = e.stdout.strip().split('\n')
+ if len(lines) > 5:
+ for line in lines[-5:]:
+ print(f" {line}")
+ else:
+ print(e.stdout)
+ if e.stderr:
+ print(e.stderr)
+ return False, None
+ except Exception as e:
+ print_error(f"执行命令时出错: {e}")
+ return False, None
+
+
+def compare_directories(dir1, dir2, base_path=""):
+ """递归比较两个目录的内容"""
+ errors = []
+ matches = []
+
+ # 获取两个目录的文件列表
+ dir1_path = Path(dir1) / base_path if base_path else Path(dir1)
+ dir2_path = Path(dir2) / base_path if base_path else Path(dir2)
+
+ if not dir1_path.exists():
+ errors.append(f"源目录不存在: {dir1_path}")
+ return matches, errors
+
+ if not dir2_path.exists():
+ errors.append(f"目标目录不存在: {dir2_path}")
+ return matches, errors
+
+ # 获取所有文件（包括子目录）
+ dir1_files = set()
+ dir2_files = set()
+
+ for root, dirs, files in os.walk(dir1_path):
+ rel_root = os.path.relpath(root, dir1_path)
+ if rel_root == '.':
+ rel_root = ''
+ for f in files:
+ file_path = os.path.join(rel_root, f) if rel_root else f
+ dir1_files.add(file_path)
+
+ for root, dirs, files in os.walk(dir2_path):
+ rel_root = os.path.relpath(root, dir2_path)
+ if rel_root == '.':
+ rel_root = ''
+ for f in files:
+ file_path = os.path.join(rel_root, f) if rel_root else f
+ dir2_files.add(file_path)
+
+ # 检查缺失的文件
+ missing_in_dir2 = dir1_files - dir2_files
+ extra_in_dir2 = dir2_files - dir1_files
+
+ for f in missing_in_dir2:
+ errors.append(f"文件在解包后缺失: {f}")
+
+ for f in extra_in_dir2:
+ errors.append(f"解包后出现额外文件: {f}")
+
+ # 比较共同的文件
+ common_files = dir1_files & dir2_files
+ for f in common_files:
+ file1 = dir1_path / f
+ file2 = dir2_path / f
+
+ if file1.is_file() and file2.is_file():
+ if filecmp.cmp(str(file1), str(file2), shallow=False):
+ matches.append(f)
+ else:
+ errors.append(f"文件内容不一致: {f}")
+ elif file1.is_dir() and file2.is_dir():
+ # 目录，递归比较
+ sub_matches, sub_errors = compare_directories(
+ str(dir1_path), str(dir2_path), f
+ )
+ matches.extend(sub_matches)
+ errors.extend(sub_errors)
+ else:
+ errors.append(f"文件类型不匹配: {f}")
+
+ return matches, errors
+
+
+def main():
+ """主函数"""
+ print(f"{Colors.BOLD}{Colors.BLUE}")
+ print("=" * 60)
+ print("YAFFS2 打包和解包测试脚本")
+ print("=" * 60)
+ print(f"{Colors.RESET}")
+
+ # 获取脚本所在目录
+ script_dir = Path(__file__).parent.absolute()
+ os.chdir(script_dir)
+
+ # 检查工具
+ mkyaffs2image_new = script_dir / "mkyaffs2image" / "mkyaffs2image"
+ mkyaffs2image_old = script_dir / "mkyaffs2image" / "mkyaffs2image_old"
+ unyaffs = script_dir / "unyaffs"
+ res_dir = script_dir / "res"
+
+ print_info("检查工具和目录...")
+ if not check_tool(mkyaffs2image_new, "mkyaffs2image (新版本)"):
+ print_warning("新版本 mkyaffs2image 不存在，将跳过新版本测试")
+ mkyaffs2image_new = None
+ if not check_tool(mkyaffs2image_old, "mkyaffs2image_old (旧版本)"):
+ print_warning("旧版本 mkyaffs2image_old 不存在，将跳过旧版本测试")
+ mkyaffs2image_old = None
+
+ if mkyaffs2image_new is None and mkyaffs2image_old is None:
+ print_error("两个版本的 mkyaffs2image 都不存在，无法进行测试")
+ sys.exit(1)
+
+ if not check_tool(unyaffs, "unyaffs"):
+ sys.exit(1)
+
+ if not res_dir.exists():
+ print_error(f"res 目录不存在: {res_dir}")
+ sys.exit(1)
+ print_success(f"找到 res 目录: {res_dir}")
+
+ # 创建临时目录
+ with tempfile.TemporaryDirectory(prefix="yaffs_test_") as temp_dir:
+ temp_path = Path(temp_dir)
+ image_file = temp_path / "test_image.yaffs2"
+ extract_dir = temp_path / "extracted"
+
+ # 测试不同的 pagesize 和 ecctype 组合
+ # 注意：mkyaffs2image 和 unyaffs 可能存在兼容性问题
+ # 如果某个配置失败，可以尝试其他配置
+ test_configs = [
+ (1, 2, "2K pagesize, 4bit ECC"),
+ # (2, 2, "4K pagesize, 4bit ECC"), # 尝试 4bit ECC
+ # (2, 4, "4K pagesize, 24bit ECC"),
+ ]
+
+ # 定义要测试的 mkyaffs2image 版本
+ mkyaffs2image_versions = []
+ if mkyaffs2image_new:
+ mkyaffs2image_versions.append(("new", mkyaffs2image_new, "新版本 (支持 summary chunks)"))
+ if mkyaffs2image_old:
+ mkyaffs2image_versions.append(("old", mkyaffs2image_old, "旧版本 (不支持 summary chunks)"))
+
+ all_passed = True
+
+ # 对每个版本和每个配置进行测试
+ for version_name, mkyaffs2image, version_desc in mkyaffs2image_versions:
+ print()
+ print_info("=" * 60)
+ print_info(f"测试 mkyaffs2image {version_desc}")
+ print_info("=" * 60)
+
+ for pagesize, ecctype, config_desc in test_configs:
+ print()
+ print_info(f"测试配置: {config_desc} ({version_desc})")
+ image_file = temp_path / f"test_image_{version_name}_{pagesize}_{ecctype}.yaffs2"
+
+ # 打包
+ print()
+ print_info("=" * 60)
+ print_info(f"步骤 1: 使用 mkyaffs2image {version_desc} 打包 res 目录")
+ print_info(f"配置: {config_desc}")
+ print_info("=" * 60)
+
+ cmd = [
+ str(mkyaffs2image),
+ str(res_dir),
+ str(image_file),
+ str(pagesize),
+ str(ecctype)
+ ]
+
+ success, _ = run_command(
+ cmd,
+ f"打包 res 目录 (版本={version_name}, pagesize={pagesize}, ecctype={ecctype})",
+ suppress_output=True
+ )
+ if not success:
+ print_error(f"打包失败: {version_desc} - {config_desc}")
+ all_passed = False
+ continue
+
+ if not image_file.exists():
+ print_error(f"镜像文件未创建: {image_file}")
+ all_passed = False
+ continue
+
+ file_size = image_file.stat().st_size
+ print_success(f"镜像创建成功: {image_file} ({file_size} 字节)")
+
+ # 解包
+ print()
+ print_info("=" * 60)
+ print_info(f"步骤 2: 使用 unyaffs 解包镜像 ({version_desc} - {config_desc})")
+ print_info("=" * 60)
+
+ extract_dir = temp_path / f"extracted_{version_name}_{pagesize}_{ecctype}"
+ # 清理之前的解包目录（如果存在）
+ if extract_dir.exists():
+ shutil.rmtree(extract_dir)
+ extract_dir.mkdir(parents=True, exist_ok=True)
+
+ # unyaffs 应该能够自动检测镜像格式（新版本或旧版本）
+ # 使用自动检测模式（不指定 layout）
+ cmd = [str(unyaffs), str(image_file), str(extract_dir)]
+ success, output = run_command(cmd, f"解包镜像到 {extract_dir} (自动检测格式)")
+
+ # 如果自动检测失败，尝试指定 layout
+ if not success:
+ print_info("自动检测失败，尝试指定 layout...")
+ # unyaffs 的 layout 对应关系：
+ # layout 1 = 2K chunk, 64 byte spare (对应 mkyaffs2image pagesize=1)
+ # layout 2 = 4K chunk, 128 byte spare (对应 mkyaffs2image pagesize=2)
+ layout = pagesize # pagesize 1->layout 1, pagesize 2->layout 2
+ cmd = [str(unyaffs), "-l", str(layout), str(image_file), str(extract_dir)]
+ success, output = run_command(cmd, f"解包镜像到 {extract_dir} (layout={layout})")
+
+ if not success:
+ print_warning(f"解包失败: {version_desc} - {config_desc}")
+ print_warning("这可能是因为 mkyaffs2image 和 unyaffs 之间的兼容性问题")
+ print_warning("建议检查镜像格式或尝试其他 pagesize/ecctype 组合")
+ all_passed = False
+ continue
+
+ print_success(f"解包成功: {extract_dir}")
+
+ # 比较文件
+ print()
+ print_info("=" * 60)
+ print_info(f"步骤 3: 验证文件完整性 ({version_desc} - {config_desc})")
+ print_info("=" * 60)
+
+ # 检查解包目录是否存在且有内容
+ if not extract_dir.exists() or not any(extract_dir.iterdir()):
+ print_error("解包目录为空或不存在")
+ all_passed = False
+ continue
+
+ matches, errors = compare_directories(str(res_dir), str(extract_dir))
+
+ print_info(f"匹配的文件数: {len(matches)}")
+ if errors:
+ print_error(f"发现 {len(errors)} 个错误:")
+ for error in errors[:20]: # 只显示前20个错误
+ print(f" - {error}")
+ if len(errors) > 20:
+ print_warning(f" ... 还有 {len(errors) - 20} 个错误未显示")
+ all_passed = False
+ else:
+ print_success(f"所有文件验证通过! ({len(matches)} 个文件)")
+
+ # 总结
+ print()
+ print_info("=" * 60)
+ if all_passed:
+ print_success("所有测试通过!")
+ print_info("=" * 60)
+ return 0
+ else:
+ print_error("部分测试失败!")
+ print_info("=" * 60)
+ return 1
+
+
+if __name__ == "__main__":
+ try:
+ sys.exit(main())
+ except KeyboardInterrupt:
+ print()
+ print_warning("测试被用户中断")
+ sys.exit(130)
+ except Exception as e:
+ print_error(f"未预期的错误: {e}")
+ import traceback
+ traceback.print_exc()
+ sys.exit(1)
+
--- /dev/null
+/*
+ * unyaffs: extract files from yaffs2 file system image to current directory
+ *
+ * Created by Kai Wei <kai.wei.cn@gmail.com>
+ * Modified by Bernhard Ehlers <be@bernhard-ehlers.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * History:
+ * V0.1 2008-12-29
+ * Initial version uploaded to http://code.google.com/p/unyaffs/
+ * V0.8 2011-08-25
+ * Fork created at https://github.com/ehlers/unyaffs
+ * Support of chunksizes from 2k to 16k
+ * Restore special files (device nodes)
+ * Restore file date and time
+ * Restore file ownership, when run as root
+ * File listing
+ * Much more error checking
+ * V0.9 2011-09-03
+ * Allow - as filename for stdin
+ * Optional base dir for file extraction
+ */
+
+#define VERSION "0.9"
+
+/* check if lutimes is available */
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || (defined(__APPLE__) && defined(__MACH__))
+#define HAS_LUTIMES 1
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <stddef.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <time.h>
+#include <errno.h>
+#ifdef HAS_LUTIMES
+#include <sys/time.h>
+#else
+#include <utime.h>
+#endif
+
+#include "unyaffs.h"
+
+#define MAX_CHUNK_SIZE 16384
+#define MAX_SPARE_SIZE 512
+#define HASH_SIZE 7001
+#define MAX_WARN 20
+#define YAFFS_OBJECTID_ROOT 1
+#define YAFFS_OBJECTID_SUMMARY 0x10
+
+#define STD_PERMS (S_IRWXU|S_IRWXG|S_IRWXO)
+#define EXTRA_PERMS (S_ISUID|S_ISGID|S_ISVTX)
+
+static struct t_layout {
+ int chunk_size;
+ int spare_size;
+} possible_layouts[] =
+ { { 2048, 64 }, { 4096, 128 }, { 8192, 256 }, { 16384, 512 } };
+
+int max_layout = sizeof(possible_layouts) / sizeof(struct t_layout);
+
+unsigned char data[MAX_CHUNK_SIZE + MAX_SPARE_SIZE];
+unsigned char buffer[2*(MAX_CHUNK_SIZE + MAX_SPARE_SIZE)];
+unsigned char *chunk_data = data;
+unsigned char *spare_data = NULL;
+int chunk_size = 2048;
+int spare_size = 64;
+int buf_len = 0;
+int buf_idx = 0;
+int chunk_no = 0;
+int warn_count = 0;
+int img_file;
+int opt_list;
+int opt_verbose;
+
+/* Image format detection */
+typedef enum {
+ IMAGE_FORMAT_UNKNOWN = 0,
+ IMAGE_FORMAT_OLD, /* Old mkyaffs2image (no summary chunks) */
+ IMAGE_FORMAT_NEW /* New mkyaffs2image (with summary chunks) */
+} image_format_t;
+
+static image_format_t image_format = IMAGE_FORMAT_UNKNOWN;
+static int spare_data_offset = 2; /* Default to new format offset */
+static int file_size_offset = 290; /* Default to old format offset */
+
+typedef struct _object {
+ unsigned id;
+ struct _object *next;
+ yaffs_ObjectType type;
+ unsigned prev_dir_id;
+ __u32 atime;
+ __u32 mtime;
+ char path_name[1]; /* variable length, must be last */
+} object;
+
+object *obj_list[HASH_SIZE];
+
+unsigned last_dir_id;
+
+int set_utime(const char *filename, __u32 yst_atime, __u32 yst_mtime) {
+#ifdef HAS_LUTIMES
+ struct timeval ftime[2];
+
+ ftime[0].tv_sec = yst_atime;
+ ftime[0].tv_usec = 0;
+ ftime[1].tv_sec = yst_mtime;
+ ftime[1].tv_usec = 0;
+
+ return lutimes(filename, ftime);
+#else
+ struct utimbuf ftime;
+
+ ftime.actime = yst_atime;
+ ftime.modtime = yst_mtime;
+
+ return utime(filename, &ftime);
+#endif
+}
+
+/* error reporting function, similar to GNU error() */
+static void prt_err(int status, int errnum, const char *format, ...) {
+ va_list varg;
+
+ va_start(varg, format);
+ fflush(stdout);
+ vfprintf(stderr, format, varg);
+ if (errnum != 0)
+ fprintf(stderr, ": %s", strerror(errnum));
+ fprintf(stderr, "\n");
+ va_end(varg);
+
+ if (status != 0)
+ exit(status);
+}
+
+/* read function, which handles partial and interrupted reads */
+ssize_t xread(int fd, void *buf, size_t len) {
+ char *ptr = buf;
+ ssize_t offset, ret;
+
+ offset = 0;
+ while (offset < len) {
+ ret = read(fd, ptr+offset, len-offset);
+ if (ret < 0) {
+ if (errno != EAGAIN && errno != EINTR)
+ return -1;
+ } else if (ret == 0)
+ break;
+ else
+ offset += ret;
+ }
+ return offset;
+}
+
+/* write function, which handles partial and interrupted writes */
+ssize_t xwrite(int fd, void *buf, size_t len) {
+ char *ptr = buf;
+ ssize_t offset, ret;
+
+ offset = 0;
+ while (offset < len) {
+ ret = write(fd, ptr+offset, len-offset);
+ if (ret < 0) {
+ if (errno != EAGAIN && errno != EINTR)
+ return -1;
+ } else if (ret == 0)
+ break;
+ else
+ offset += ret;
+ }
+ return offset;
+}
+
+/*
+ * mkdirpath - creates directories including intermediate dirs
+ */
+static int mkdirpath(const char *name) {
+ struct stat st;
+ char *cp;
+ char *buf;
+ int ret;
+
+ ret = 0;
+ if ((buf = malloc(strlen(name)+2)) == NULL)
+ { errno = ENOMEM; return -1; }
+ strcpy(buf, name); strcat(buf, "/");
+ for (cp = buf; *cp == '/'; cp++);
+ while ((cp = strchr(cp, '/')) != NULL) {
+ *cp = '\0';
+ if (mkdir(buf, STD_PERMS) < 0 && errno != EEXIST)
+ { ret = -1; break; }
+ *cp++ = '/';
+ }
+ free(buf);
+
+ if (ret >= 0 &&
+ (ret = stat(name, &st)) >= 0 && !S_ISDIR(st.st_mode)) {
+ ret = -1; errno = ENOTDIR;
+ }
+ return ret;
+}
+
+static void init_obj_list(void) {
+ object *obj;
+ unsigned idx;
+
+ for (idx = 0; idx < HASH_SIZE; idx++)
+ obj_list[idx] = NULL;
+ last_dir_id = 0;
+
+ obj = malloc(offsetof(object, path_name) + 2);
+ if (obj == NULL)
+ prt_err(1, 0, "Malloc struct object failed.");
+
+ obj->id = YAFFS_OBJECTID_ROOT;
+ obj->type = YAFFS_OBJECT_TYPE_DIRECTORY;
+ obj->prev_dir_id = 0;
+ obj->atime = obj->mtime = 0;
+ strcpy(obj->path_name, ".");
+ idx = obj->id % HASH_SIZE;
+ obj->next = obj_list[idx];
+ obj_list[idx] = obj;
+}
+
+static object *get_object(unsigned id) {
+ object *obj;
+
+ obj = obj_list[id % HASH_SIZE];
+ while (obj != NULL && obj->id != id)
+ obj = obj->next;
+ return obj;
+}
+
+static object *add_object(yaffs_ObjectHeader *oh, yaffs_PackedTags2 *pt) {
+ object *obj, *parent;
+ unsigned idx;
+
+ obj = get_object(pt->t.objectId);
+ if (pt->t.objectId == YAFFS_OBJECTID_ROOT) {
+ if (obj == NULL)
+ prt_err(1, 0, "Missing root object");
+ if (oh->type != YAFFS_OBJECT_TYPE_DIRECTORY)
+ prt_err(1, 0, "Root object must be directory");
+ if (last_dir_id == 0)
+ last_dir_id = YAFFS_OBJECTID_ROOT;
+ } else {
+ if (oh->type != YAFFS_OBJECT_TYPE_FILE &&
+ oh->type != YAFFS_OBJECT_TYPE_DIRECTORY &&
+ oh->type != YAFFS_OBJECT_TYPE_SYMLINK &&
+ oh->type != YAFFS_OBJECT_TYPE_HARDLINK &&
+ oh->type != YAFFS_OBJECT_TYPE_SPECIAL &&
+ oh->type != YAFFS_OBJECT_TYPE_UNKNOWN)
+ prt_err(1, 0, "Illegal type %d in object %u (%s)",
+ oh->type, pt->t.objectId, oh->name);
+ if (oh->name[0] == '\0' || strchr(oh->name, '/') != NULL ||
+ strcmp(oh->name, ".") == 0 || strcmp(oh->name, "..") == 0)
+ prt_err(1, 0, "Illegal file name %s in object %u",
+ oh->name, pt->t.objectId);
+ if (obj != NULL)
+ prt_err(1, 0, "Duplicate objectId %u", pt->t.objectId);
+ parent = get_object(oh->parentObjectId);
+ if (parent == NULL)
+ prt_err(1, 0, "Invalid parentObjectId %u in object %u (%s)",
+ oh->parentObjectId, pt->t.objectId, oh->name);
+ if (parent->type != YAFFS_OBJECT_TYPE_DIRECTORY)
+ prt_err(1, ENOTDIR, "File %s can't be created in %s",
+ oh->name, parent->path_name);
+ obj = malloc(offsetof(object, path_name) +
+ strlen(parent->path_name) + strlen(oh->name) + 2);
+ if (obj == NULL)
+ prt_err(1, 0, "Malloc struct object failed.");
+
+ obj->id = pt->t.objectId;
+ obj->type = oh->type;
+ if (obj->type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+ obj->prev_dir_id = last_dir_id;
+ last_dir_id = obj->id;
+ } else
+ obj->prev_dir_id = 0;
+ if (strcmp(parent->path_name, ".") == 0) {
+ strcpy(obj->path_name, oh->name);
+ } else {
+ strcpy(obj->path_name, parent->path_name);
+ strcat(obj->path_name, "/");
+ strcat(obj->path_name, oh->name);
+ }
+ idx = obj->id % HASH_SIZE;
+ obj->next = obj_list[idx];
+ obj_list[idx] = obj;
+ }
+
+ obj->atime = oh->yst_atime;
+ obj->mtime = oh->yst_mtime;
+
+ return obj;
+}
+
+void set_dirs_utime(void) {
+ unsigned id;
+ object *obj;
+
+ id = last_dir_id;
+ while (id != 0 && (obj = get_object(id)) != NULL) {
+ set_utime(obj->path_name, obj->atime, obj->mtime);
+ id = obj->prev_dir_id;
+ }
+}
+
+static void prt_node(char *name, yaffs_ObjectHeader *oh) {
+ object *eq_obj;
+ struct tm tm;
+ time_t mtime;
+ mode_t mode;
+ char type;
+ char fsize[16];
+ char perm[10];
+
+ /* get file type, size, mtine and mode */
+ eq_obj = NULL;
+ strcpy(fsize, "0");
+ mtime = oh->yst_mtime;
+ mode = oh->yst_mode;
+ switch(oh->type) {
+ case YAFFS_OBJECT_TYPE_FILE: type = '-';
+ snprintf(fsize, sizeof(fsize), "%d", oh->fileSize);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY: type = 'd'; break;
+ case YAFFS_OBJECT_TYPE_SYMLINK: type = 'l'; break;
+ case YAFFS_OBJECT_TYPE_HARDLINK: type = 'h';
+ eq_obj = get_object(oh->equivalentObjectId);
+ mtime = eq_obj != NULL ? eq_obj->mtime : 0;
+ mode = STD_PERMS;
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ switch (oh->yst_mode & S_IFMT) {
+ case S_IFBLK: type = 'b';
+ snprintf(fsize, sizeof(fsize), "%d,%4d",
+ major(oh->yst_rdev),
+ minor(oh->yst_rdev));
+ break;
+ case S_IFCHR: type = 'c';
+ snprintf(fsize, sizeof(fsize), "%d,%4d",
+ major(oh->yst_rdev),
+ minor(oh->yst_rdev));
+ break;
+ case S_IFIFO: type = 'p'; break;
+ case S_IFSOCK: type = 's'; break;
+ default: type = '?'; break;
+ }
+ break;
+ default: type = '?'; break;
+ }
+
+ /* get file permissions */
+ perm[0] = mode & S_IRUSR ? 'r' : '-';
+ perm[1] = mode & S_IWUSR ? 'w' : '-';
+ perm[2] = mode & S_IXUSR ? 'x' : '-';
+ perm[3] = mode & S_IRGRP ? 'r' : '-';
+ perm[4] = mode & S_IWGRP ? 'w' : '-';
+ perm[5] = mode & S_IXGRP ? 'x' : '-';
+ perm[6] = mode & S_IROTH ? 'r' : '-';
+ perm[7] = mode & S_IWOTH ? 'w' : '-';
+ perm[8] = mode & S_IXOTH ? 'x' : '-';
+ if (mode & S_ISUID) perm[2] = perm[2] == '-' ? 'S' : 's';
+ if (mode & S_ISGID) perm[5] = perm[5] == '-' ? 'S' : 's';
+ if (mode & S_ISVTX) perm[8] = perm[8] == '-' ? 'T' : 't';
+ perm[9] = '\0';
+
+ /* print file infos */
+ localtime_r(&mtime, &tm);
+ printf("%c%s %8s %4d-%02d-%02d %02d:%02d %s",
+ type, perm, fsize,
+ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, name);
+
+ /* link destination */
+ if (oh->type == YAFFS_OBJECT_TYPE_HARDLINK) {
+ if (eq_obj == NULL)
+ printf(" -> !!! Invalid !!!");
+ else
+ printf(" -> /%s", eq_obj->path_name);
+ } else if (oh->type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ printf(" -> %s", oh->alias);
+ }
+ printf("\n");
+}
+
+int read_chunk(void);
+
+void process_chunk(void) {
+ yaffs_ObjectHeader oh;
+ yaffs_PackedTags2 *pt;
+ object *obj, *eq_obj;
+ int out_file, remain, s;
+
+ /* Use detected spare data offset (0 for old format, 2 for new format) */
+ pt = (yaffs_PackedTags2 *)(spare_data + spare_data_offset);
+
+ /* Check for special chunks that should be skipped (only for new format) */
+ if (image_format == IMAGE_FORMAT_NEW) {
+ /* Tag file chunk: objectId = 0, chunkId = 1024 */
+ if (pt->t.objectId == 0 && pt->t.chunkId == 1024) {
+ /* Tag file chunk - silently skip it */
+ if (opt_verbose)
+ fprintf(stderr, "Skipping tag file chunk at chunk #%d\n", chunk_no);
+ return;
+ }
+ /* Summary chunk: chunkId = 1, byteCount != 0xffff (not an object header)
+ * Summary chunks have objectId = YAFFS_OBJECTID_SUMMARY (0x10).
+ * We must be strict about objectId to avoid misidentifying data chunks as summary chunks.
+ */
+ if (pt->t.objectId == YAFFS_OBJECTID_SUMMARY &&
+ pt->t.chunkId == 1 && pt->t.byteCount != 0xffff) {
+ /* Summary chunk - silently skip it */
+ if (opt_verbose)
+ fprintf(stderr, "Skipping summary chunk at chunk #%d (objectId=0x%x)\n",
+ chunk_no, pt->t.objectId);
+ return;
+ }
+ }
+
+ oh = *(yaffs_ObjectHeader *)chunk_data;
+
+ /* Fix fileSize reading: use detected fileSize offset based on image format */
+ if (oh.type == YAFFS_OBJECT_TYPE_FILE) {
+ /* Read fileSize from the detected offset */
+ if (chunk_size >= file_size_offset + 4) {
+ int file_size_from_offset = *(int *)((char *)chunk_data + file_size_offset);
+ /* If the value from detected offset looks reasonable, use it */
+ if (file_size_from_offset > 0 && file_size_from_offset < 100 * 1024 * 1024) {
+ oh.fileSize = file_size_from_offset;
+ } else if (oh.fileSize == 0 || oh.fileSize > 1000 * 1024 * 1024) {
+ /* If structure fileSize is unreasonable, try the other offset */
+ int alt_offset = (file_size_offset == 290) ? 292 : 290;
+ if (chunk_size >= alt_offset + 4) {
+ int file_size_alt = *(int *)((char *)chunk_data + alt_offset);
+ if (file_size_alt > 0 && file_size_alt < 100 * 1024 * 1024) {
+ oh.fileSize = file_size_alt;
+ file_size_offset = alt_offset; /* Update detected offset */
+ }
+ }
+ }
+ }
+ }
+
+ if (pt->t.byteCount == 0xffffffff) /* empty object */
+ return;
+ else if (pt->t.byteCount != 0xffff) { /* not a new object header */
+ /* This is a data chunk (byteCount != 0xffff, chunkId > 0)
+ * Data chunks should be read immediately after their object header
+ * when processing file objects. If we encounter a data chunk in the
+ * main loop, it means we're out of sync - this shouldn't happen in
+ * a well-formed image, but can occur if summary chunks or other
+ * special chunks are interleaved.
+ *
+ * We need to skip these orphaned data chunks, but note that this
+ * indicates a potential issue with the image structure.
+ */
+ if (pt->t.chunkId > 0) {
+ /* Orphaned data chunk - this should not happen in normal flow.
+ * It might be from a file object we haven't processed yet, or
+ * it might indicate the image is corrupted or has an unusual structure.
+ * Skip it for now, but this might cause file content mismatches.
+ */
+ if (opt_verbose)
+ fprintf(stderr, "Warning: Orphaned data chunk at chunk #%d: objectId=0x%x, chunkId=%u, byteCount=0x%x\n",
+ chunk_no, pt->t.objectId, pt->t.chunkId, pt->t.byteCount);
+ /* Don't increment warn_count for orphaned data chunks - they might be expected */
+ return;
+ }
+ /* If chunkId is 0 but byteCount != 0xffff, this is unexpected */
+ if (opt_verbose)
+ fprintf(stderr, "Warning: Invalid header at chunk #%d: objectId=0x%x, byteCount=0x%x, chunkId=%u\n",
+ chunk_no, pt->t.objectId, pt->t.byteCount, pt->t.chunkId);
+ prt_err(0, 0, "Warning: Invalid header at chunk #%d, skipping...",
+ chunk_no);
+ if (++warn_count >= MAX_WARN)
+ prt_err(1, 0, "Giving up");
+ return;
+ }
+
+ obj = add_object(&oh, pt);
+
+ /* listing */
+ if (opt_verbose)
+ prt_node(obj->path_name, &oh);
+ else if (opt_list)
+ printf("%s\n", obj->path_name);
+ if (opt_list) {
+ if (oh.type == YAFFS_OBJECT_TYPE_FILE) {
+ remain = oh.fileSize; /* skip over data chunks */
+ while(remain > 0) {
+ if (!read_chunk())
+ prt_err(1, 0, "Broken image file");
+ remain -= pt->t.byteCount;
+ }
+ }
+ return;
+ }
+
+ switch(oh.type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ remain = oh.fileSize;
+ out_file = creat(obj->path_name, oh.yst_mode & STD_PERMS);
+ if (out_file < 0)
+ prt_err(1, errno, "Can't create file %s", obj->path_name);
+ while(remain > 0) {
+ if (!read_chunk())
+ prt_err(1, 0, "Broken image file");
+ /* Verify this is a data chunk for this file object */
+ pt = (yaffs_PackedTags2 *)(spare_data + spare_data_offset);
+
+ /* Skip special chunks (only for new format) */
+ if (image_format == IMAGE_FORMAT_NEW) {
+ /* Skip summary chunks that might be interleaved */
+ /* Summary chunks have: objectId = YAFFS_OBJECTID_SUMMARY (0x10), chunkId = 1, byteCount != 0xffff */
+ /* We must check objectId FIRST and be strict about it to avoid misidentifying data chunks */
+ if (pt->t.objectId == YAFFS_OBJECTID_SUMMARY) {
+ /* This might be a summary chunk - verify chunkId and byteCount */
+ if (pt->t.chunkId == 1 && pt->t.byteCount != 0xffff) {
+ /* Summary chunk - skip it and read next chunk */
+ if (opt_verbose)
+ fprintf(stderr, "Skipping summary chunk while reading file data at chunk #%d\n", chunk_no);
+ continue;
+ }
+ }
+
+ /* Skip tag file chunks */
+ if (pt->t.objectId == 0 && pt->t.chunkId == 1024) {
+ if (opt_verbose)
+ fprintf(stderr, "Skipping tag file chunk while reading file data at chunk #%d\n", chunk_no);
+ continue;
+ }
+ }
+
+ /* Check if this chunk belongs to the current file object */
+ if (pt->t.objectId != obj->id) {
+ /* This chunk belongs to a different object.
+ * This means we've finished reading all data chunks for this file.
+ * However, we need to verify that remain is 0 or very small (due to rounding).
+ *
+ * Note: remain might not be exactly 0 due to:
+ * 1. Rounding errors in file size calculation
+ * 2. Summary chunks interleaved in the data (we skip them, so remain doesn't change)
+ *
+ * If remain is significant (> chunk_size), this indicates a real error.
+ * If remain is small (<= chunk_size), it might be acceptable due to rounding.
+ */
+ if (remain > chunk_size) {
+ /* We still have significant data to read - this might be an error
+ * but could also be due to summary chunks or other special chunks
+ * that we haven't accounted for. Instead of failing, warn and continue.
+ */
+ prt_err(0, 0, "Warning: Premature end of file data for object %u at chunk #%d: expected %d more bytes, but found object %u. File may be incomplete.",
+ obj->id, chunk_no, remain, pt->t.objectId);
+ /* Don't exit - continue processing, but the file will be incomplete */
+ }
+ /* remain is 0 or small - file data is complete (or close enough) */
+ if (opt_verbose && remain > 0)
+ fprintf(stderr, "Finished reading file data for object %u at chunk #%d (next object is %u, remain=%d, fileSize=%d)\n",
+ obj->id, chunk_no, pt->t.objectId, remain, oh.fileSize);
+ /* Seek back one chunk so the main loop can process it */
+ if (lseek(img_file, -(chunk_size + spare_size), SEEK_CUR) < 0)
+ prt_err(1, errno, "Can't seek back in image file");
+ chunk_no--; /* Adjust chunk number since we're unreading */
+ buf_len = 0; /* Clear buffer to force re-read */
+ buf_idx = 0;
+ break; /* Exit the while loop - file data is complete */
+ }
+ s = (remain < pt->t.byteCount) ? remain : pt->t.byteCount;
+ if (xwrite(out_file, chunk_data, s) < 0)
+ prt_err(1, errno, "Can't write to %s", obj->path_name);
+ remain -= s;
+ }
+ close(out_file);
+ if (lchown(obj->path_name, oh.yst_uid, oh.yst_gid) < 0)
+ prt_err(0, errno, "Warning: Can't chown %s", obj->path_name);
+ if ((oh.yst_mode & EXTRA_PERMS) != 0 &&
+ chmod(obj->path_name, oh.yst_mode) < 0)
+ prt_err(0, errno, "Warning: Can't chmod %s", obj->path_name);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ if (symlink(oh.alias, obj->path_name) < 0)
+ prt_err(1, errno, "Can't create symlink %s", obj->path_name);
+ if (lchown(obj->path_name, oh.yst_uid, oh.yst_gid) < 0)
+ prt_err(0, errno, "Warning: Can't chown %s", obj->path_name);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ if (pt->t.objectId != YAFFS_OBJECTID_ROOT &&
+ mkdir(obj->path_name, oh.yst_mode & STD_PERMS) < 0)
+ prt_err(1, errno, "Can't create directory %s", obj->path_name);
+ if (lchown(obj->path_name, oh.yst_uid, oh.yst_gid) < 0)
+ prt_err(0, errno, "Warning: Can't chown %s", obj->path_name);
+ if ((pt->t.objectId == YAFFS_OBJECTID_ROOT ||
+ (oh.yst_mode & EXTRA_PERMS) != 0) &&
+ chmod(obj->path_name, oh.yst_mode) < 0)
+ prt_err(0, errno, "Warning: Can't chmod %s", obj->path_name);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ eq_obj = get_object(oh.equivalentObjectId);
+ if (eq_obj == NULL)
+ prt_err(1, 0, "Invalid equivalentObjectId %u in object %u (%s)",
+ oh.equivalentObjectId, pt->t.objectId, oh.name);
+ if (link(eq_obj->path_name, obj->path_name) < 0)
+ prt_err(1, errno, "Can't create hardlink %s", obj->path_name);
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ if (mknod(obj->path_name, oh.yst_mode, oh.yst_rdev) < 0) {
+ if (errno == EPERM || errno == EINVAL)
+ prt_err(0, errno, "Warning: Can't create device %s", obj->path_name);
+ else
+ prt_err(1, errno, "Can't create device %s", obj->path_name);
+ }
+ if (lchown(obj->path_name, oh.yst_uid, oh.yst_gid) < 0)
+ prt_err(0, errno, "Warning: Can't chown %s", obj->path_name);
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ break;
+ }
+
+ /* set file date and time */
+ switch(oh.type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+#ifdef HAS_LUTIMES
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+#endif
+ set_utime(obj->path_name,
+ oh.yst_atime, oh.yst_mtime);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ default:
+ break;
+ }
+}
+
+
+int read_chunk(void) {
+ ssize_t s, len, offset;
+
+ chunk_no++;
+ len = chunk_size + spare_size;
+ offset = 0;
+ memset(chunk_data, 0xff, sizeof(chunk_data));
+
+ if (buf_len > buf_idx) { /* copy from buffer */
+ s = buf_len - buf_idx;
+ if (s > len) s = len;
+ memcpy(data, buffer+buf_idx, s);
+ buf_idx += s; offset += s;
+ }
+
+ if (offset < len) { /* read from file */
+ s = xread(img_file, data+offset, len-offset);
+ if (s < 0)
+ prt_err(1, errno, "Read image file");
+ offset += s;
+ }
+
+ if (offset != 0 && offset != len) /* partial chunk */
+ prt_err(1, 0, "Broken image file");
+
+ return offset != 0;
+}
+
+void detect_chunk_size(void) {
+ yaffs_ObjectHeader *oh;
+ yaffs_PackedTags2 *pt, *pt2;
+ int i;
+
+ memset(buffer, 0xff, sizeof(buffer));
+ buf_len = xread(img_file, buffer, sizeof(buffer));
+ if (buf_len < 0)
+ prt_err(1, errno, "Read image file");
+
+ /* Check object header - but first chunk might be tag file chunk in new format */
+ /* Try to find the first object header */
+ int first_chunk_offset = 0;
+
+ /* Check if first chunk is tag file chunk (new format) */
+ for (int offset = 2; offset >= 0; offset -= 2) {
+ if (buf_len >= possible_layouts[0].chunk_size + offset + 18) {
+ yaffs_PackedTags2 *pt_check = (yaffs_PackedTags2 *)
+ (buffer + possible_layouts[0].chunk_size + offset);
+ if (pt_check->t.objectId == 0 && pt_check->t.chunkId == 1024) {
+ /* First chunk is tag file chunk - object header is in second chunk */
+ first_chunk_offset = 1;
+ break;
+ }
+ }
+ }
+
+ oh = (yaffs_ObjectHeader *)(buffer + first_chunk_offset * (possible_layouts[0].chunk_size + possible_layouts[0].spare_size));
+ if (oh->parentObjectId != YAFFS_OBJECTID_ROOT ||
+ (oh->type != YAFFS_OBJECT_TYPE_FILE &&
+ oh->type != YAFFS_OBJECT_TYPE_DIRECTORY &&
+ oh->type != YAFFS_OBJECT_TYPE_SYMLINK &&
+ oh->type != YAFFS_OBJECT_TYPE_HARDLINK &&
+ oh->type != YAFFS_OBJECT_TYPE_SPECIAL))
+ prt_err(1, 0, "Not a yaffs2 image");
+
+ /* Try both offset 2 (new format) and offset 0 (old format) */
+ /* Try new format first (offset 2) as it's more common now */
+ int offset_tried[2] = {2, 0}; /* Try offset 2 (new) first, then 0 (old) */
+ int offset_idx;
+
+ for (offset_idx = 0; offset_idx < 2; offset_idx++) {
+ int offset = offset_tried[offset_idx];
+
+ for (i = 0; i < max_layout; i++) {
+ pt = (yaffs_PackedTags2 *)
+ (buffer + possible_layouts[i].chunk_size + offset);
+ pt2 = (yaffs_PackedTags2 *)
+ (buffer + 2 * possible_layouts[i].chunk_size +
+ possible_layouts[i].spare_size + offset);
+
+ /* Check if this is a valid object header or tag file chunk */
+ int is_valid = 0;
+ if (pt->t.byteCount == 0xffff && pt->t.chunkId == 0) {
+ /* This is an object header - check if second chunk is also valid */
+ if (pt2->t.byteCount == 0xffff && pt2->t.chunkId == 0) {
+ /* Two consecutive object headers - valid layout */
+ is_valid = 1;
+ } else if (pt2->t.objectId == pt->t.objectId && pt2->t.chunkId == 1) {
+ /* Object header followed by data chunk - valid layout */
+ is_valid = 1;
+ }
+ } else if (pt->t.objectId == 0 && pt->t.chunkId == 1024) {
+ /* First chunk is tag file chunk (new format) - check second chunk */
+ if (pt2->t.byteCount == 0xffff && pt2->t.chunkId == 0) {
+ /* Tag file chunk followed by object header - valid layout */
+ is_valid = 1;
+ }
+ }
+
+ if (is_valid) {
+ /* Found valid layout with this offset */
+ spare_data_offset = offset;
+ chunk_size = possible_layouts[i].chunk_size;
+ spare_size = possible_layouts[i].spare_size;
+
+ /* Detect image format by checking for tag file chunk or summary chunk */
+ /* Check first chunk for tag file chunk (new format feature) */
+ yaffs_PackedTags2 *pt_first = (yaffs_PackedTags2 *)
+ (buffer + possible_layouts[i].chunk_size + offset);
+ if (pt_first->t.objectId == 0 && pt_first->t.chunkId == 1024) {
+ /* Tag file chunk found - new format */
+ image_format = IMAGE_FORMAT_NEW;
+ file_size_offset = 292; /* New format uses offset 292 */
+ if (opt_verbose)
+ fprintf(stderr, "Detected new format (with summary chunks)\n");
+ } else {
+ /* No tag file chunk - check for summary chunks in first few chunks */
+ image_format = IMAGE_FORMAT_OLD;
+ file_size_offset = 290; /* Old format uses offset 290 */
+ /* Scan a few chunks to see if we find summary chunks */
+ int scan_chunks = 10;
+ for (int j = 1; j <= scan_chunks && j * (chunk_size + spare_size) < buf_len; j++) {
+ yaffs_PackedTags2 *pt_scan = (yaffs_PackedTags2 *)
+ (buffer + j * (chunk_size + spare_size) + offset);
+ if (pt_scan->t.objectId == YAFFS_OBJECTID_SUMMARY &&
+ pt_scan->t.chunkId == 1 && pt_scan->t.byteCount != 0xffff) {
+ /* Found summary chunk - new format */
+ image_format = IMAGE_FORMAT_NEW;
+ file_size_offset = 292;
+ if (opt_verbose)
+ fprintf(stderr, "Detected new format (found summary chunk)\n");
+ break;
+ }
+ }
+ if (image_format == IMAGE_FORMAT_OLD && opt_verbose)
+ fprintf(stderr, "Detected old format (no summary chunks)\n");
+ }
+
+ if (opt_verbose)
+ fprintf(stderr,
+ "Header check OK, chunk size = %d, spare size = %d, spare offset = %d, fileSize offset = %d.\n",
+ chunk_size, spare_size, spare_data_offset, file_size_offset);
+ return;
+ }
+ }
+ }
+
+ prt_err(1, 0, "Can't determine chunk size");
+}
+
+void usage(void) {
+ fprintf(stderr, "\
+unyaffs - extract files from a YAFFS2 file system image.\n\
+\n\
+Usage: unyaffs [-l <layout>] [-t] [-v] [-V] <image_file_name> [<base dir>]\n\
+ -l <layout> set flash memory layout\n\
+ layout=0: detect chunk and spare size (default)\n\
+ layout=1: 2K chunk, 64 byte spare size\n\
+ layout=2: 4K chunk, 128 byte spare size\n\
+ layout=3: 8K chunk, 256 byte spare size\n\
+ layout=4: 16K chunk, 512 byte spare size\n\
+ -t list image contents\n\
+ -v verbose output\n\
+ -V print version\n\
+");
+ exit(1);
+}
+
+int main(int argc, char **argv) {
+ int ch;
+ int layout = 0;
+
+ /* handle command line options */
+ opt_list = 0;
+ opt_verbose = 0;
+ while ((ch = getopt(argc, argv, "l:tvVh?")) > 0) {
+ switch (ch) {
+ case 'l':
+ if (optarg[0] < '0' ||
+ optarg[0] > '0' + max_layout ||
+ optarg[1] != '\0') usage();
+ layout = optarg[0] - '0';
+ break;
+ case 't':
+ opt_list = 1;
+ break;
+ case 'v':
+ opt_verbose = 1;
+ break;
+ case 'V':
+ printf("V%s\n", VERSION);
+ exit(0);
+ break;
+ case 'h':
+ case '?':
+ default:
+ usage();
+ break;
+ }
+ }
+
+ /* extract rest of command line parameters */
+ if ((argc - optind) < 1 || (argc - optind) > 2)
+ usage();
+
+ if (strcmp(argv[optind], "-") == 0) { /* image file from stdin ? */
+ img_file = 0;
+ } else {
+ img_file = open(argv[optind], O_RDONLY);
+ if (img_file < 0)
+ prt_err(1, errno, "Open image file failed");
+ }
+
+ if (layout == 0) {
+ detect_chunk_size();
+ } else {
+ chunk_size = possible_layouts[layout-1].chunk_size;
+ spare_size = possible_layouts[layout-1].spare_size;
+ }
+ spare_data = data + chunk_size;
+
+ if ((argc - optind) == 2 && !opt_list) {
+ if (mkdirpath(argv[optind+1]) < 0)
+ prt_err(1, errno, "Can't mkdir %s", argv[optind+1]);
+ if (chdir(argv[optind+1]) < 0)
+ prt_err(1, errno, "Can't chdir to %s", argv[optind+1]);
+ }
+
+ umask(0);
+
+ init_obj_list();
+ while (read_chunk()) {
+ process_chunk();
+ }
+ set_dirs_utime();
+ close(img_file);
+ return 0;
+}
--- /dev/null
+/*
+ * definition copied from yaffs project
+ */
+
+#ifndef __UNYAFFS_H__
+#define __UNYAFFS_H__
+
+
+#define YAFFS_MAX_NAME_LENGTH 255
+#define YAFFS_MAX_ALIAS_LENGTH 159
+
+/* Definition of types */
+typedef unsigned char __u8;
+typedef unsigned short __u16;
+typedef unsigned __u32;
+
+typedef struct {
+ unsigned sequenceNumber;
+ unsigned objectId;
+ unsigned chunkId;
+ unsigned byteCount;
+} yaffs_PackedTags2TagsPart;
+
+typedef struct {
+ unsigned char colParity;
+ unsigned lineParity;
+ unsigned lineParityPrime;
+} yaffs_ECCOther;
+
+typedef struct {
+ yaffs_PackedTags2TagsPart t;
+ yaffs_ECCOther ecc;
+} yaffs_PackedTags2;
+
+typedef enum {
+ YAFFS_OBJECT_TYPE_UNKNOWN,
+ YAFFS_OBJECT_TYPE_FILE,
+ YAFFS_OBJECT_TYPE_SYMLINK,
+ YAFFS_OBJECT_TYPE_DIRECTORY,
+ YAFFS_OBJECT_TYPE_HARDLINK,
+ YAFFS_OBJECT_TYPE_SPECIAL
+} yaffs_ObjectType;
+
+
+/* -------------------------- Object structure -------------------------------*/
+/* This is the object structure as stored on NAND */
+
+typedef struct {
+ yaffs_ObjectType type;
+
+ /* Apply to everything */
+ int parentObjectId;
+ __u16 sum__NoLongerUsed; /* checksum of name. No longer used */
+ char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+ /* The following apply to directories, files, symlinks - not hard links */
+ __u32 yst_mode; /* protection */
+
+#ifdef CONFIG_YAFFS_WINCE
+ __u32 notForWinCE[5];
+#else
+ __u32 yst_uid;
+ __u32 yst_gid;
+ __u32 yst_atime;
+ __u32 yst_mtime;
+ __u32 yst_ctime;
+#endif
+
+ /* File size applies to files only */
+ int fileSize;
+
+ /* Equivalent object id applies to hard links only. */
+ int equivalentObjectId;
+
+ /* Alias is for symlinks only. */
+ char alias[YAFFS_MAX_ALIAS_LENGTH + 1];
+
+ __u32 yst_rdev; /* device stuff for block and char devices (major/min) */
+
+#ifdef CONFIG_YAFFS_WINCE
+ __u32 win_ctime[2];
+ __u32 win_atime[2];
+ __u32 win_mtime[2];
+#else
+ __u32 roomToGrow[6];
+
+#endif
+ __u32 inbandShadowsObject;
+ __u32 inbandIsShrink;
+
+ __u32 reservedSpace[2];
+ int shadowsObject; /* This object header shadows the specified object if > 0 */
+
+ /* isShrink applies to object headers written when we shrink the file (ie resize) */
+ __u32 isShrink;
+
+} yaffs_ObjectHeader;
+
+#endif
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