diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..638b9b9
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,39 @@
+AccessModifierOffset: -4
+AlignAfterOpenBracket: DontAlign
+AllowShortBlocksOnASingleLine: true
+AllowShortFunctionsOnASingleLine: All
+BasedOnStyle: LLVM
+BraceWrapping:
+  AfterClass: false
+  AfterControlStatement: false
+  AfterEnum: false
+  AfterFunction: false
+  AfterNamespace: false
+  AfterStruct: false
+  AfterUnion: false
+  BeforeCatch: true
+  BeforeElse: true
+  IndentBraces: false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+BreakBeforeBraces: Custom
+ColumnLimit: 0
+Cpp11BracedListStyle: false
+FixNamespaceComments: false
+IndentCaseLabels: false
+IndentPPDirectives: None
+IndentWidth: 4
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: All
+PointerAlignment: Right
+SortIncludes: false
+SortUsingDeclarations: false
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 4
+UseTab: true
diff --git a/2/pack_v1.c b/2/pack_v1.c
new file mode 100644
index 0000000..1d036d0
--- /dev/null
+++ b/2/pack_v1.c
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main() {
+	DIR *dir;
+	struct dirent *entry;
+	int pack_fd, file_fd;
+	char buffer[4096];
+	ssize_t bytes_read;
+
+	// 打开当前目录
+	dir = opendir(".");
+	if (dir == NULL) {
+		perror("无法打开当前目录");
+		return 1;
+	}
+
+	// 创建打包文件
+	pack_fd = open("a.pack", O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (pack_fd == -1) {
+		perror("无法创建打包文件");
+		closedir(dir);
+		return 1;
+	}
+
+	// 遍历目录中的所有文件
+	while ((entry = readdir(dir)) != NULL) {
+		// 忽略目录项和a.pack文件本身
+		if (entry->d_type == DT_DIR || strcmp(entry->d_name, "a.pack") == 0) {
+			continue;
+		}
+
+		printf("正在打包: %s\n", entry->d_name);
+
+		// 写入文件名长度
+		int name_len = strlen(entry->d_name);
+		write(pack_fd, &name_len, sizeof(int));
+
+		// 写入文件名
+		write(pack_fd, entry->d_name, name_len);
+
+		// 打开源文件
+		file_fd = open(entry->d_name, O_RDONLY);
+		if (file_fd == -1) {
+			perror("无法打开源文件");
+			continue;
+		}
+
+		// 获取文件大小
+		struct stat st;
+		fstat(file_fd, &st);
+		int file_size = st.st_size;
+
+		// 写入文件大小
+		write(pack_fd, &file_size, sizeof(int));
+
+		// 写入文件数据
+		while ((bytes_read = read(file_fd, buffer, sizeof(buffer))) > 0) {
+			write(pack_fd, buffer, bytes_read);
+		}
+
+		close(file_fd);
+	}
+
+	close(pack_fd);
+	closedir(dir);
+
+	printf("打包完成，所有文件已打包到 a.pack\n");
+	return 0;
+}
diff --git a/2/pack_v2.c b/2/pack_v2.c
new file mode 100644
index 0000000..88abfdb
--- /dev/null
+++ b/2/pack_v2.c
@@ -0,0 +1,94 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]) {
+	DIR *dir;
+	struct dirent *entry;
+	int pack_fd, file_fd;
+	char buffer[4096];
+	ssize_t bytes_read;
+	char filepath[PATH_MAX];
+
+	// 检查命令行参数
+	if (argc != 2) {
+		fprintf(stderr, "用法: %s <目录名>\n", argv[0]);
+		return 1;
+	}
+
+	// 打开指定目录
+	dir = opendir(argv[1]);
+	if (dir == NULL) {
+		perror("无法打开指定目录");
+		return 1;
+	}
+
+	// 创建打包文件
+	pack_fd = open("a.pack", O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (pack_fd == -1) {
+		perror("无法创建打包文件");
+		closedir(dir);
+		return 1;
+	}
+
+	// 遍历目录中的所有文件
+	while ((entry = readdir(dir)) != NULL) {
+		struct stat st;
+
+		// 跳过 . 和 .. 目录
+		if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {
+			continue;
+		}
+
+		// 构建完整的文件路径
+		snprintf(filepath, PATH_MAX, "%s/%s", argv[1], entry->d_name);
+
+		// 获取文件状态
+		if (stat(filepath, &st) == -1) {
+			perror("获取文件状态失败");
+			continue;
+		}
+
+		// 只处理普通文件
+		if (!S_ISREG(st.st_mode)) {
+			continue;
+		}
+
+		printf("正在打包: %s\n", entry->d_name);
+
+		// 写入文件名长度
+		int name_len = strlen(entry->d_name);
+		write(pack_fd, &name_len, sizeof(int));
+
+		// 写入文件名
+		write(pack_fd, entry->d_name, name_len);
+
+		// 打开源文件
+		file_fd = open(filepath, O_RDONLY);
+		if (file_fd == -1) {
+			perror("无法打开源文件");
+			continue;
+		}
+
+		// 写入文件大小
+		int file_size = st.st_size;
+		write(pack_fd, &file_size, sizeof(int));
+
+		// 写入文件数据
+		while ((bytes_read = read(file_fd, buffer, sizeof(buffer))) > 0) {
+			write(pack_fd, buffer, bytes_read);
+		}
+
+		close(file_fd);
+	}
+
+	close(pack_fd);
+	closedir(dir);
+
+	printf("打包完成，所有文件已打包到 a.pack\n");
+	return 0;
+}
diff --git a/2/unpack_v1.c b/2/unpack_v1.c
new file mode 100644
index 0000000..5470eca
--- /dev/null
+++ b/2/unpack_v1.c
@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main() {
+	int pack_fd, file_fd;
+	char buffer[4096];
+	ssize_t bytes_read;
+
+	// 打开打包文件
+	pack_fd = open("a.pack", O_RDONLY);
+	if (pack_fd == -1) {
+		perror("无法打开打包文件");
+		return 1;
+	}
+
+	// 读取并解包文件
+	while (1) {
+		int name_len, file_size;
+
+		// 读取文件名长度
+		if (read(pack_fd, &name_len, sizeof(int)) <= 0) {
+			// 到达文件末尾或出错
+			break;
+		}
+
+		// 读取文件名
+		char *filename = (char *)malloc(name_len + 1);
+		if (filename == NULL) {
+			perror("内存分配失败");
+			close(pack_fd);
+			return 1;
+		}
+
+		read(pack_fd, filename, name_len);
+		filename[name_len] = '\0'; // 添加字符串结束符
+
+		// 读取文件大小
+		read(pack_fd, &file_size, sizeof(int));
+
+		printf("正在解包: %s (%d 字节)\n", filename, file_size);
+
+		// 创建目标文件
+		file_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+		if (file_fd == -1) {
+			perror("无法创建目标文件");
+			free(filename);
+			continue;
+		}
+
+		// 拷贝文件数据
+		int remaining = file_size;
+		while (remaining > 0) {
+			int to_read = (remaining < sizeof(buffer)) ? remaining : sizeof(buffer);
+			bytes_read = read(pack_fd, buffer, to_read);
+			if (bytes_read <= 0) {
+				perror("读取文件数据失败");
+				break;
+			}
+
+			write(file_fd, buffer, bytes_read);
+			remaining -= bytes_read;
+		}
+
+		close(file_fd);
+		free(filename);
+	}
+
+	close(pack_fd);
+	printf("解包完成\n");
+	return 0;
+}
diff --git a/2/unpack_v2.c b/2/unpack_v2.c
new file mode 100644
index 0000000..edc0c99
--- /dev/null
+++ b/2/unpack_v2.c
@@ -0,0 +1,152 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdbool.h>
+
+// 列出打包文件中的内容，不解包
+void list_pack_contents(const char *packfile) {
+	int pack_fd;
+
+	pack_fd = open(packfile, O_RDONLY);
+	if (pack_fd == -1) {
+		perror("无法打开打包文件");
+		exit(1);
+	}
+
+	printf("%-30s %s\n", "文件名", "文件大小 (字节)");
+	printf("%-30s %s\n", "------------------------------", "---------------");
+
+	while (1) {
+		int name_len, file_size;
+
+		// 读取文件名长度
+		if (read(pack_fd, &name_len, sizeof(int)) <= 0) {
+			break; // 到达文件末尾或出错
+		}
+
+		// 读取文件名
+		char *filename = (char *)malloc(name_len + 1);
+		if (filename == NULL) {
+			perror("内存分配失败");
+			close(pack_fd);
+			exit(1);
+		}
+
+		read(pack_fd, filename, name_len);
+		filename[name_len] = '\0'; // 添加字符串结束符
+
+		// 读取文件大小
+		read(pack_fd, &file_size, sizeof(int));
+
+		// 打印文件信息
+		printf("%-30s %d\n", filename, file_size);
+
+		// 跳过文件数据
+		lseek(pack_fd, file_size, SEEK_CUR);
+
+		free(filename);
+	}
+
+	close(pack_fd);
+}
+
+// 解包文件
+void extract_pack(const char *packfile) {
+	int pack_fd, file_fd;
+	char buffer[4096];
+	ssize_t bytes_read;
+
+	// 打开打包文件
+	pack_fd = open(packfile, O_RDONLY);
+	if (pack_fd == -1) {
+		perror("无法打开打包文件");
+		exit(1);
+	}
+
+	// 读取并解包文件
+	while (1) {
+		int name_len, file_size;
+
+		// 读取文件名长度
+		if (read(pack_fd, &name_len, sizeof(int)) <= 0) {
+			break; // 到达文件末尾或出错
+		}
+
+		// 读取文件名
+		char *filename = (char *)malloc(name_len + 1);
+		if (filename == NULL) {
+			perror("内存分配失败");
+			close(pack_fd);
+			exit(1);
+		}
+
+		read(pack_fd, filename, name_len);
+		filename[name_len] = '\0'; // 添加字符串结束符
+
+		// 读取文件大小
+		read(pack_fd, &file_size, sizeof(int));
+
+		printf("正在解包: %s (%d 字节)\n", filename, file_size);
+
+		// 创建目标文件
+		file_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+		if (file_fd == -1) {
+			perror("无法创建目标文件");
+			free(filename);
+			continue;
+		}
+
+		// 拷贝文件数据
+		int remaining = file_size;
+		while (remaining > 0) {
+			int to_read = (remaining < sizeof(buffer)) ? remaining : sizeof(buffer);
+			bytes_read = read(pack_fd, buffer, to_read);
+			if (bytes_read <= 0) {
+				perror("读取文件数据失败");
+				break;
+			}
+
+			write(file_fd, buffer, bytes_read);
+			remaining -= bytes_read;
+		}
+
+		close(file_fd);
+		free(filename);
+	}
+
+	close(pack_fd);
+	printf("解包完成\n");
+}
+
+int main(int argc, char *argv[]) {
+	bool list_only = false;
+	char *packfile = NULL;
+
+	// 解析命令行参数
+	if (argc == 2) {
+		// 普通解包模式
+		packfile = argv[1];
+	}
+	else if (argc == 3 && strcmp(argv[1], "-l") == 0) {
+		// 列表模式
+		list_only = true;
+		packfile = argv[2];
+	}
+	else {
+		fprintf(stderr, "用法:\n");
+		fprintf(stderr, "  %s <打包文件>        - 解包文件\n", argv[0]);
+		fprintf(stderr, "  %s -l <打包文件>     - 列出打包文件内容\n", argv[0]);
+		return 1;
+	}
+
+	if (list_only) {
+		list_pack_contents(packfile);
+	}
+	else {
+		extract_pack(packfile);
+	}
+
+	return 0;
+}