archival/unzip.c - codeaurora/busybox - Gitiles

 /* vi: set sw=4 ts=4: */
 /*
  * Mini unzip implementation for busybox
  *
  * Copyright (C) 2004 by Ed Clark
  *
  * Loosely based on original busybox unzip applet by Laurence Anderson.
  * All options and features should work in this version.
  *
  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  */

 /* For reference see
  * http://www.pkware.com/company/standards/appnote/
  * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
  */

 /* TODO
  * Endian issues
  * Zip64 + other methods
  * Improve handling of zip format, ie.
  * - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
  * - unix file permissions, etc.
  * - central directory
  */

 #include "busybox.h"
 #include "unarchive.h"

 #define ZIP_FILEHEADER_MAGIC		SWAP_LE32(0x04034b50)
 #define ZIP_CDS_MAGIC			SWAP_LE32(0x02014b50)
 #define ZIP_CDS_END_MAGIC		SWAP_LE32(0x06054b50)
 #define ZIP_DD_MAGIC			SWAP_LE32(0x08074b50)

 extern unsigned int gunzip_crc;
 extern unsigned int gunzip_bytes_out;

 typedef union {
 	unsigned char raw[26];
 	struct {
 		unsigned short version;	/* 0-1 */
 		unsigned short flags;	/* 2-3 */
 		unsigned short method;	/* 4-5 */
 		unsigned short modtime;	/* 6-7 */
 		unsigned short moddate;	/* 8-9 */
 		unsigned int crc32 ATTRIBUTE_PACKED;	/* 10-13 */
 		unsigned int cmpsize ATTRIBUTE_PACKED;	/* 14-17 */
 		unsigned int ucmpsize ATTRIBUTE_PACKED;	/* 18-21 */
 		unsigned short filename_len;	/* 22-23 */
 		unsigned short extra_len;		/* 24-25 */
 	} formatted ATTRIBUTE_PACKED;
 } zip_header_t;

 static void unzip_skip(int fd, off_t skip)
 {
 	if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
 		if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
 			bb_error_msg_and_die("seek failure");
 		}
 	}
 }

 static void unzip_create_leading_dirs(char *fn)
 {
 	/* Create all leading directories */
 	char *name = xstrdup(fn);
 	if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
 		bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
 	}
 	free(name);
 }

 static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
 {
 	if (zip_header->formatted.method == 0) {
 		/* Method 0 - stored (not compressed) */
 		off_t size = zip_header->formatted.ucmpsize;
 		if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
 			bb_error_msg_and_die("cannot complete extraction");
 		}

 	} else {
 		/* Method 8 - inflate */
 		inflate_init(zip_header->formatted.cmpsize);
 		inflate_unzip(src_fd, dst_fd);
 		inflate_cleanup();
 		/* Validate decompression - crc */
 		if (zip_header->formatted.crc32 != (gunzip_crc ^ 0xffffffffL)) {
 			bb_error_msg("invalid compressed data--%s error", "crc");
 			return 1;
 		}
 		/* Validate decompression - size */
 		if (zip_header->formatted.ucmpsize != gunzip_bytes_out) {
 			bb_error_msg("invalid compressed data--%s error", "length");
 			return 1;
 		}
 	}
 	return 0;
 }

 int unzip_main(int argc, char **argv)
 {
 	zip_header_t zip_header;
 	enum {v_silent, v_normal, v_list} verbosity = v_normal;
 	enum {o_prompt, o_never, o_always} overwrite = o_prompt;
 	unsigned int total_size = 0;
 	unsigned int total_entries = 0;
 	int src_fd = -1, dst_fd = -1;
 	char *src_fn = NULL, *dst_fn = NULL;
 	llist_t *zaccept = NULL;
 	llist_t *zreject = NULL;
 	char *base_dir = NULL;
 	int failed, i, opt, opt_range = 0, list_header_done = 0;
 	char key_buf[512];
 	struct stat stat_buf;

 	while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
 		switch (opt_range) {
 		case 0: /* Options */
 			switch (opt) {
 			case 'l': /* List */
 				verbosity = v_list;
 				break;

 			case 'n': /* Never overwrite existing files */
 				overwrite = o_never;
 				break;

 			case 'o': /* Always overwrite existing files */
 				overwrite = o_always;
 				break;

 			case 'p': /* Extract files to stdout and fall through to set verbosity */
 				dst_fd = STDOUT_FILENO;

 			case 'q': /* Be quiet */
 				verbosity = (verbosity == v_normal) ? v_silent : verbosity;
 				break;

 			case 1 : /* The zip file */
 				src_fn = xstrndup(optarg, strlen(optarg)+4);
 				opt_range++;
 				break;

 			default:
 				bb_show_usage();

 			}
 			break;

 		case 1: /* Include files */
 			if (opt == 1) {
 				llist_add_to(&zaccept, optarg);

 			} else if (opt == 'd') {
 				base_dir = optarg;
 				opt_range += 2;

 			} else if (opt == 'x') {
 				opt_range++;

 			} else {
 				bb_show_usage();
 			}
 			break;

 		case 2 : /* Exclude files */
 			if (opt == 1) {
 				llist_add_to(&zreject, optarg);

 			} else if (opt == 'd') { /* Extract to base directory */
 				base_dir = optarg;
 				opt_range++;

 			} else {
 				bb_show_usage();
 			}
 			break;

 		default:
 			bb_show_usage();
 		}
 	}

 	if (src_fn == NULL) {
 		bb_show_usage();
 	}

 	/* Open input file */
 	if (strcmp("-", src_fn) == 0) {
 		src_fd = STDIN_FILENO;
 		/* Cannot use prompt mode since zip data is arriving on STDIN */
 		overwrite = (overwrite == o_prompt) ? o_never : overwrite;

 	} else {
 		static const char *const extn[] = {"", ".zip", ".ZIP"};
 		int orig_src_fn_len = strlen(src_fn);
 		for(i = 0; (i < 3) && (src_fd == -1); i++) {
 			strcpy(src_fn + orig_src_fn_len, extn[i]);
 			src_fd = open(src_fn, O_RDONLY);
 		}
 		if (src_fd == -1) {
 			src_fn[orig_src_fn_len] = 0;
 			bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
 		}
 	}

 	/* Change dir if necessary */
 	if (base_dir)
 		xchdir(base_dir);

 	if (verbosity != v_silent)
 		printf("Archive:  %s\n", src_fn);

 	failed = 0;

 	while (1) {
 		unsigned int magic;

 		/* Check magic number */
 		xread(src_fd, &magic, 4);
 		if (magic == ZIP_CDS_MAGIC) {
 			break;
 		} else if (magic != ZIP_FILEHEADER_MAGIC) {
 			bb_error_msg_and_die("Invalid zip magic %08X", magic);
 		}

 		/* Read the file header */
 		xread(src_fd, zip_header.raw, 26);
 		zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
 		zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
 		zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
 		zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
 		zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
 		zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
 		zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
 		zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
 		zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
 		zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
 		if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 			bb_error_msg_and_die("Unsupported compression method %d", zip_header.formatted.method);
 		}

 		/* Read filename */
 		free(dst_fn);
 		dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 		xread(src_fd, dst_fn, zip_header.formatted.filename_len);

 		/* Skip extra header bytes */
 		unzip_skip(src_fd, zip_header.formatted.extra_len);

 		if ((verbosity == v_list) && !list_header_done){
 			printf("  Length     Date   Time    Name\n"
 				   " --------    ----   ----    ----\n");
 			list_header_done = 1;
 		}

 		/* Filter zip entries */
 		if (find_list_entry(zreject, dst_fn) ||
 			(zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
 			i = 'n';

 		} else { /* Extract entry */
 			total_size += zip_header.formatted.ucmpsize;

 			if (verbosity == v_list) { /* List entry */
 				unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 				printf("%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 					   zip_header.formatted.ucmpsize,
 					   (dostime & 0x01e00000) >> 21,
 					   (dostime & 0x001f0000) >> 16,
 					   (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 					   (dostime & 0x0000f800) >> 11,
 					   (dostime & 0x000007e0) >> 5,
 					   dst_fn);
 				total_entries++;
 				i = 'n';

 			} else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
 				i = -1;

 			} else if (last_char_is(dst_fn, '/')) { /* Extract directory */
 				if (stat(dst_fn, &stat_buf) == -1) {
 					if (errno != ENOENT) {
 						bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
 					}
 					if (verbosity == v_normal) {
 						printf("   creating: %s\n", dst_fn);
 					}
 					unzip_create_leading_dirs(dst_fn);
 					if (bb_make_directory(dst_fn, 0777, 0)) {
 						bb_error_msg_and_die("Exiting");
 					}
 				} else {
 					if (!S_ISDIR(stat_buf.st_mode)) {
 						bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
 					}
 				}
 				i = 'n';

 			} else {  /* Extract file */
 			_check_file:
 				if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
 					if (errno != ENOENT) {
 						bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
 					}
 					i = 'y';

 				} else { /* File already exists */
 					if (overwrite == o_never) {
 						i = 'n';

 					} else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
 						if (overwrite == o_always) {
 							i = 'y';
 						} else {
 							printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 							if (!fgets(key_buf, 512, stdin)) {
 								bb_perror_msg_and_die("Cannot read input");
 							}
 							i = key_buf[0];
 						}

 					} else { /* File is not regular file */
 						bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
 					}
 				}
 			}
 		}

 		switch (i) {
 		case 'A':
 			overwrite = o_always;
 		case 'y': /* Open file and fall into unzip */
 			unzip_create_leading_dirs(dst_fn);
 			dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 		case -1: /* Unzip */
 			if (verbosity == v_normal) {
 				printf("  inflating: %s\n", dst_fn);
 			}
 			if (unzip_extract(&zip_header, src_fd, dst_fd)) {
 			    failed = 1;
 			}
 			if (dst_fd != STDOUT_FILENO) {
 				/* closing STDOUT is potentially bad for future business */
 				close(dst_fd);
 			}
 			break;

 		case 'N':
 			overwrite = o_never;
 		case 'n':
 			/* Skip entry data */
 			unzip_skip(src_fd, zip_header.formatted.cmpsize);
 			break;

 		case 'r':
 			/* Prompt for new name */
 			printf("new name: ");
 			if (!fgets(key_buf, 512, stdin)) {
 				bb_perror_msg_and_die("Cannot read input");
 			}
 			free(dst_fn);
 			dst_fn = xstrdup(key_buf);
 			chomp(dst_fn);
 			goto _check_file;

 		default:
 			printf("error: invalid response [%c]\n",(char)i);
 			goto _check_file;
 		}

 		/* Data descriptor section */
 		if (zip_header.formatted.flags & 4) {
 			/* skip over duplicate crc, compressed size and uncompressed size */
 			unzip_skip(src_fd, 12);
 		}
 	}

 	if (verbosity == v_list) {
 		printf(" --------                   -------\n"
 		       "%9d                   %d files\n", total_size, total_entries);
 	}

 	return failed;
 }
	/* vi: set sw=4 ts=4: */
	/*
	* Mini unzip implementation for busybox
	*
	* Copyright (C) 2004 by Ed Clark
	*
	* Loosely based on original busybox unzip applet by Laurence Anderson.
	* All options and features should work in this version.
	*
	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
	*/

	/* For reference see
	* http://www.pkware.com/company/standards/appnote/
	* http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
	*/

	/* TODO
	* Endian issues
	* Zip64 + other methods
	* Improve handling of zip format, ie.
	* - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
	* - unix file permissions, etc.
	* - central directory
	*/

	#include "busybox.h"
	#include "unarchive.h"

	#define ZIP_FILEHEADER_MAGIC SWAP_LE32(0x04034b50)
	#define ZIP_CDS_MAGIC SWAP_LE32(0x02014b50)
	#define ZIP_CDS_END_MAGIC SWAP_LE32(0x06054b50)
	#define ZIP_DD_MAGIC SWAP_LE32(0x08074b50)

	extern unsigned int gunzip_crc;
	extern unsigned int gunzip_bytes_out;

	typedef union {
	unsigned char raw[26];
	struct {
	unsigned short version; /* 0-1 */
	unsigned short flags; /* 2-3 */
	unsigned short method; /* 4-5 */
	unsigned short modtime; /* 6-7 */
	unsigned short moddate; /* 8-9 */
	unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
	unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
	unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
	unsigned short filename_len; /* 22-23 */
	unsigned short extra_len; /* 24-25 */
	} formatted ATTRIBUTE_PACKED;
	} zip_header_t;

	static void unzip_skip(int fd, off_t skip)
	{
	if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
	if ((errno != ESPIPE) \|\| (bb_copyfd_size(fd, -1, skip) != skip)) {
	bb_error_msg_and_die("seek failure");
	}
	}
	}

	static void unzip_create_leading_dirs(char *fn)
	{
	/* Create all leading directories */
	char *name = xstrdup(fn);
	if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
	bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
	}
	free(name);
	}

	static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
	{
	if (zip_header->formatted.method == 0) {
	/* Method 0 - stored (not compressed) */
	off_t size = zip_header->formatted.ucmpsize;
	if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
	bb_error_msg_and_die("cannot complete extraction");
	}

	} else {
	/* Method 8 - inflate */
	inflate_init(zip_header->formatted.cmpsize);
	inflate_unzip(src_fd, dst_fd);
	inflate_cleanup();
	/* Validate decompression - crc */
	if (zip_header->formatted.crc32 != (gunzip_crc ^ 0xffffffffL)) {
	bb_error_msg("invalid compressed data--%s error", "crc");
	return 1;
	}
	/* Validate decompression - size */
	if (zip_header->formatted.ucmpsize != gunzip_bytes_out) {
	bb_error_msg("invalid compressed data--%s error", "length");
	return 1;
	}
	}
	return 0;
	}

	int unzip_main(int argc, char **argv)
	{
	zip_header_t zip_header;
	enum {v_silent, v_normal, v_list} verbosity = v_normal;
	enum {o_prompt, o_never, o_always} overwrite = o_prompt;
	unsigned int total_size = 0;
	unsigned int total_entries = 0;
	int src_fd = -1, dst_fd = -1;
	char src_fn = NULL, dst_fn = NULL;
	llist_t *zaccept = NULL;
	llist_t *zreject = NULL;
	char *base_dir = NULL;
	int failed, i, opt, opt_range = 0, list_header_done = 0;
	char key_buf[512];
	struct stat stat_buf;

	while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
	switch (opt_range) {
	case 0: /* Options */
	switch (opt) {
	case 'l': /* List */
	verbosity = v_list;
	break;

	case 'n': /* Never overwrite existing files */
	overwrite = o_never;
	break;

	case 'o': /* Always overwrite existing files */
	overwrite = o_always;
	break;

	case 'p': /* Extract files to stdout and fall through to set verbosity */
	dst_fd = STDOUT_FILENO;

	case 'q': /* Be quiet */
	verbosity = (verbosity == v_normal) ? v_silent : verbosity;
	break;

	case 1 : /* The zip file */
	src_fn = xstrndup(optarg, strlen(optarg)+4);
	opt_range++;
	break;

	default:
	bb_show_usage();

	}
	break;

	case 1: /* Include files */
	if (opt == 1) {
	llist_add_to(&zaccept, optarg);

	} else if (opt == 'd') {
	base_dir = optarg;
	opt_range += 2;

	} else if (opt == 'x') {
	opt_range++;

	} else {
	bb_show_usage();
	}
	break;

	case 2 : /* Exclude files */
	if (opt == 1) {
	llist_add_to(&zreject, optarg);

	} else if (opt == 'd') { /* Extract to base directory */
	base_dir = optarg;
	opt_range++;

	} else {
	bb_show_usage();
	}
	break;

	default:
	bb_show_usage();
	}
	}

	if (src_fn == NULL) {
	bb_show_usage();
	}

	/* Open input file */
	if (strcmp("-", src_fn) == 0) {
	src_fd = STDIN_FILENO;
	/* Cannot use prompt mode since zip data is arriving on STDIN */
	overwrite = (overwrite == o_prompt) ? o_never : overwrite;

	} else {
	static const char *const extn[] = {"", ".zip", ".ZIP"};
	int orig_src_fn_len = strlen(src_fn);
	for(i = 0; (i < 3) && (src_fd == -1); i++) {
	strcpy(src_fn + orig_src_fn_len, extn[i]);
	src_fd = open(src_fn, O_RDONLY);
	}
	if (src_fd == -1) {
	src_fn[orig_src_fn_len] = 0;
	bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
	}
	}

	/* Change dir if necessary */
	if (base_dir)
	xchdir(base_dir);

	if (verbosity != v_silent)
	printf("Archive: %s\n", src_fn);

	failed = 0;

	while (1) {
	unsigned int magic;

	/* Check magic number */
	xread(src_fd, &magic, 4);
	if (magic == ZIP_CDS_MAGIC) {
	break;
	} else if (magic != ZIP_FILEHEADER_MAGIC) {
	bb_error_msg_and_die("Invalid zip magic %08X", magic);
	}

	/* Read the file header */
	xread(src_fd, zip_header.raw, 26);
	zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
	zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
	zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
	zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
	zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
	zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
	zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
	zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
	zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
	zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
	if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
	bb_error_msg_and_die("Unsupported compression method %d", zip_header.formatted.method);
	}

	/* Read filename */
	free(dst_fn);
	dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
	xread(src_fd, dst_fn, zip_header.formatted.filename_len);

	/* Skip extra header bytes */
	unzip_skip(src_fd, zip_header.formatted.extra_len);

	if ((verbosity == v_list) && !list_header_done){
	printf(" Length Date Time Name\n"
	" -------- ---- ---- ----\n");
	list_header_done = 1;
	}

	/* Filter zip entries */
	if (find_list_entry(zreject, dst_fn) \|\|
	(zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
	i = 'n';

	} else { /* Extract entry */
	total_size += zip_header.formatted.ucmpsize;

	if (verbosity == v_list) { /* List entry */
	unsigned int dostime = zip_header.formatted.modtime \| (zip_header.formatted.moddate << 16);
	printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
	zip_header.formatted.ucmpsize,
	(dostime & 0x01e00000) >> 21,
	(dostime & 0x001f0000) >> 16,
	(((dostime & 0xfe000000) >> 25) + 1980) % 100,
	(dostime & 0x0000f800) >> 11,
	(dostime & 0x000007e0) >> 5,
	dst_fn);
	total_entries++;
	i = 'n';

	} else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
	i = -1;

	} else if (last_char_is(dst_fn, '/')) { /* Extract directory */
	if (stat(dst_fn, &stat_buf) == -1) {
	if (errno != ENOENT) {
	bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
	}
	if (verbosity == v_normal) {
	printf(" creating: %s\n", dst_fn);
	}
	unzip_create_leading_dirs(dst_fn);
	if (bb_make_directory(dst_fn, 0777, 0)) {
	bb_error_msg_and_die("Exiting");
	}
	} else {
	if (!S_ISDIR(stat_buf.st_mode)) {
	bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
	}
	}
	i = 'n';

	} else { /* Extract file */
	_check_file:
	if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
	if (errno != ENOENT) {
	bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
	}
	i = 'y';

	} else { /* File already exists */
	if (overwrite == o_never) {
	i = 'n';

	} else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
	if (overwrite == o_always) {
	i = 'y';
	} else {
	printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
	if (!fgets(key_buf, 512, stdin)) {
	bb_perror_msg_and_die("Cannot read input");
	}
	i = key_buf[0];
	}

	} else { /* File is not regular file */
	bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
	}
	}
	}
	}

	switch (i) {
	case 'A':
	overwrite = o_always;
	case 'y': /* Open file and fall into unzip */
	unzip_create_leading_dirs(dst_fn);
	dst_fd = xopen(dst_fn, O_WRONLY \| O_CREAT \| O_TRUNC);
	case -1: /* Unzip */
	if (verbosity == v_normal) {
	printf(" inflating: %s\n", dst_fn);
	}
	if (unzip_extract(&zip_header, src_fd, dst_fd)) {
	failed = 1;
	}
	if (dst_fd != STDOUT_FILENO) {
	/* closing STDOUT is potentially bad for future business */
	close(dst_fd);
	}
	break;

	case 'N':
	overwrite = o_never;
	case 'n':
	/* Skip entry data */
	unzip_skip(src_fd, zip_header.formatted.cmpsize);
	break;

	case 'r':
	/* Prompt for new name */
	printf("new name: ");
	if (!fgets(key_buf, 512, stdin)) {
	bb_perror_msg_and_die("Cannot read input");
	}
	free(dst_fn);
	dst_fn = xstrdup(key_buf);
	chomp(dst_fn);
	goto _check_file;

	default:
	printf("error: invalid response [%c]\n",(char)i);
	goto _check_file;
	}

	/* Data descriptor section */
	if (zip_header.formatted.flags & 4) {
	/* skip over duplicate crc, compressed size and uncompressed size */
	unzip_skip(src_fd, 12);
	}
	}

	if (verbosity == v_list) {
	printf(" -------- -------\n"
	"%9d %d files\n", total_size, total_entries);
	}

	return failed;
	}