/* 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 GPLv2 or later, see file LICENSE in this source tree.
 */

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

/* TODO
 * Zip64 + other methods
 */

//usage:#define unzip_trivial_usage
//usage:       "[-opts[modifiers]] FILE[.zip] [LIST] [-x XLIST] [-d DIR]"
//usage:#define unzip_full_usage "\n\n"
//usage:       "Extract files from ZIP archives\n"
//usage:     "\n        -l      List archive contents (with -q for short form)"
//usage:     "\n        -n      Never overwrite files (default)"
//usage:     "\n        -o      Overwrite"
//usage:     "\n        -p      Send output to stdout"
//usage:     "\n        -q      Quiet"
//usage:     "\n        -x XLST Exclude these files"
//usage:     "\n        -d DIR  Extract files into DIR"

#include "libbb.h"
#include "archive.h"

enum {
#if BB_BIG_ENDIAN
        ZIP_FILEHEADER_MAGIC = 0x504b0304,
        ZIP_CDF_MAGIC        = 0x504b0102, /* central directory's file header */
        ZIP_CDE_MAGIC        = 0x504b0506, /* "end of central directory" record */
        ZIP_DD_MAGIC         = 0x504b0708,
#else
        ZIP_FILEHEADER_MAGIC = 0x04034b50,
        ZIP_CDF_MAGIC        = 0x02014b50,
        ZIP_CDE_MAGIC        = 0x06054b50,
        ZIP_DD_MAGIC         = 0x08074b50,
#endif
};

#define ZIP_HEADER_LEN 26

typedef union {
        uint8_t raw[ZIP_HEADER_LEN];
        struct {
                uint16_t version;               /* 0-1 */
                uint16_t zip_flags;             /* 2-3 */
                uint16_t method;                /* 4-5 */
                uint16_t modtime;               /* 6-7 */
                uint16_t moddate;               /* 8-9 */
                uint32_t crc32 PACKED;          /* 10-13 */
                uint32_t cmpsize PACKED;        /* 14-17 */
                uint32_t ucmpsize PACKED;       /* 18-21 */
                uint16_t filename_len;          /* 22-23 */
                uint16_t extra_len;             /* 24-25 */
        } formatted PACKED;
} zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */

/* Check the offset of the last element, not the length.  This leniency
 * allows for poor packing, whereby the overall struct may be too long,
 * even though the elements are all in the right place.
 */
struct BUG_zip_header_must_be_26_bytes {
        char BUG_zip_header_must_be_26_bytes[
                offsetof(zip_header_t, formatted.extra_len) + 2
                        == ZIP_HEADER_LEN ? 1 : -1];
};

#define FIX_ENDIANNESS_ZIP(zip_header) do { \
        (zip_header).formatted.version      = SWAP_LE16((zip_header).formatted.version     ); \
        (zip_header).formatted.method       = SWAP_LE16((zip_header).formatted.method      ); \
        (zip_header).formatted.modtime      = SWAP_LE16((zip_header).formatted.modtime     ); \
        (zip_header).formatted.moddate      = SWAP_LE16((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_LE16((zip_header).formatted.filename_len); \
        (zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
} while (0)

#define CDF_HEADER_LEN 42

typedef union {
        uint8_t raw[CDF_HEADER_LEN];
        struct {
                /* uint32_t signature; 50 4b 01 02 */
                uint16_t version_made_by;       /* 0-1 */
                uint16_t version_needed;        /* 2-3 */
                uint16_t cdf_flags;             /* 4-5 */
                uint16_t method;                /* 6-7 */
                uint16_t mtime;                 /* 8-9 */
                uint16_t mdate;                 /* 10-11 */
                uint32_t crc32;                 /* 12-15 */
                uint32_t cmpsize;               /* 16-19 */
                uint32_t ucmpsize;              /* 20-23 */
                uint16_t file_name_length;      /* 24-25 */
                uint16_t extra_field_length;    /* 26-27 */
                uint16_t file_comment_length;   /* 28-29 */
                uint16_t disk_number_start;     /* 30-31 */
                uint16_t internal_file_attributes; /* 32-33 */
                uint32_t external_file_attributes PACKED; /* 34-37 */
                uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
        } formatted PACKED;
} cdf_header_t;

struct BUG_cdf_header_must_be_42_bytes {
        char BUG_cdf_header_must_be_42_bytes[
                offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
                        == CDF_HEADER_LEN ? 1 : -1];
};

#define FIX_ENDIANNESS_CDF(cdf_header) do { \
        (cdf_header).formatted.crc32        = SWAP_LE32((cdf_header).formatted.crc32       ); \
        (cdf_header).formatted.cmpsize      = SWAP_LE32((cdf_header).formatted.cmpsize     ); \
        (cdf_header).formatted.ucmpsize     = SWAP_LE32((cdf_header).formatted.ucmpsize    ); \
        (cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
        (cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
        (cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
        IF_DESKTOP( \
        (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
        (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
        ) \
} while (0)

#define CDE_HEADER_LEN 16

typedef union {
        uint8_t raw[CDE_HEADER_LEN];
        struct {
                /* uint32_t signature; 50 4b 05 06 */
                uint16_t this_disk_no;
                uint16_t disk_with_cdf_no;
                uint16_t cdf_entries_on_this_disk;
                uint16_t cdf_entries_total;
                uint32_t cdf_size;
                uint32_t cdf_offset;
                /* uint16_t file_comment_length; */
                /* .ZIP file comment (variable size) */
        } formatted PACKED;
} cde_header_t;

struct BUG_cde_header_must_be_16_bytes {
        char BUG_cde_header_must_be_16_bytes[
                sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
};

#define FIX_ENDIANNESS_CDE(cde_header) do { \
        (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
} while (0)

enum { zip_fd = 3 };


#if ENABLE_DESKTOP

#define PEEK_FROM_END 16384

/* NB: does not preserve file position! */
static uint32_t find_cdf_offset(void)
{
        cde_header_t cde_header;
        unsigned char *p;
        off_t end;
        unsigned char *buf = xzalloc(PEEK_FROM_END);

        end = xlseek(zip_fd, 0, SEEK_END);
        end -= PEEK_FROM_END;
        if (end < 0)
                end = 0;
        xlseek(zip_fd, end, SEEK_SET);
        full_read(zip_fd, buf, PEEK_FROM_END);

        p = buf;
        while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
                if (*p != 'P') {
                        p++;
                        continue;
                }
                if (*++p != 'K')
                        continue;
                if (*++p != 5)
                        continue;
                if (*++p != 6)
                        continue;
                /* we found CDE! */
                memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
                FIX_ENDIANNESS_CDE(cde_header);
                free(buf);
                return cde_header.formatted.cdf_offset;
        }
        //free(buf);
        bb_error_msg_and_die("can't find file table");
};

static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
{
        off_t org;

        org = xlseek(zip_fd, 0, SEEK_CUR);

        if (!cdf_offset)
                cdf_offset = find_cdf_offset();

        xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
        xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
        FIX_ENDIANNESS_CDF(*cdf_ptr);
        cdf_offset += 4 + CDF_HEADER_LEN
                + cdf_ptr->formatted.file_name_length
                + cdf_ptr->formatted.extra_field_length
                + cdf_ptr->formatted.file_comment_length;

        xlseek(zip_fd, org, SEEK_SET);
        return cdf_offset;
};
#endif

static void unzip_skip(off_t skip)
{
        if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
                bb_copyfd_exact_size(zip_fd, -1, skip);
}

static void unzip_create_leading_dirs(const 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 void unzip_extract(zip_header_t *zip_header, 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_exact_size(zip_fd, dst_fd, size);
        } else {
                /* Method 8 - inflate */
                inflate_unzip_result res;
                if (inflate_unzip(&res, zip_header->formatted.cmpsize, zip_fd, dst_fd) < 0)
                        bb_error_msg_and_die("inflate error");
                /* Validate decompression - crc */
                if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
                        bb_error_msg_and_die("crc error");
                }
                /* Validate decompression - size */
                if (zip_header->formatted.ucmpsize != res.bytes_out) {
                        /* Don't die. Who knows, maybe len calculation
                         * was botched somewhere. After all, crc matched! */
                        bb_error_msg("bad length");
                }
        }
}

int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int unzip_main(int argc, char **argv)
{
        enum { O_PROMPT, O_NEVER, O_ALWAYS };

        zip_header_t zip_header;
        smallint quiet = 0;
        IF_NOT_DESKTOP(const) smallint verbose = 0;
        smallint listing = 0;
        smallint overwrite = O_PROMPT;
#if ENABLE_DESKTOP
        uint32_t cdf_offset;
#endif
        unsigned long total_usize;
        unsigned long total_size;
        unsigned total_entries;
        int dst_fd = -1;
        char *src_fn = NULL;
        char *dst_fn = NULL;
        llist_t *zaccept = NULL;
        llist_t *zreject = NULL;
        char *base_dir = NULL;
        int i, opt;
        int opt_range = 0;
        char key_buf[80];
        struct stat stat_buf;

/* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 *
 * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 * --------  ------  ------- -----   ----   ----   ------    ----
 *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 * --------          -------  ---                            -------
 *   204372            35278  83%                            1 file
 * # /usr/bin/unzip -v decompress_unlzma.i.zip
 * Archive:  decompress_unlzma.i.zip
 *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 * --------  ------  ------- -----   ----   ----   ------    ----
 *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 * --------          -------  ---                            -------
 *   204372            35278  83%                            1 file
 * # unzip -v decompress_unlzma.i.zip
 * Archive:  decompress_unlzma.i.zip
 *   Length     Date   Time    Name
 *  --------    ----   ----    ----
 *    204372  09-06-09 14:23   decompress_unlzma.i
 *  --------                   -------
 *    204372                   1 files
 * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 *    204372  09-06-09 14:23   decompress_unlzma.i
 * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 *   Length     Date   Time    Name
 *  --------    ----   ----    ----
 *    204372  09-06-09 14:23   decompress_unlzma.i
 *  --------                   -------
 *    204372                   1 file
 * # /usr/bin/unzip -l decompress_unlzma.i.zip
 * Archive:  decompress_unlzma.i.zip
 *   Length     Date   Time    Name
 *  --------    ----   ----    ----
 *    204372  09-06-09 14:23   decompress_unlzma.i
 *  --------                   -------
 *    204372                   1 file
 */

        /* '-' makes getopt return 1 for non-options */
        while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
                switch (opt_range) {
                case 0: /* Options */
                        switch (opt) {
                        case 'l': /* List */
                                listing = 1;
                                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 */
                                quiet++;
                                break;

                        case 'v': /* Verbose list */
                                IF_DESKTOP(verbose++;)
                                listing = 1;
                                break;

                        case 1: /* The zip file */
                                /* +5: space for ".zip" and NUL */
                                src_fn = xmalloc(strlen(optarg) + 5);
                                strcpy(src_fn, optarg);
                                opt_range++;
                                break;

                        default:
                                bb_show_usage();
                        }
                        break;

                case 1: /* Include files */
                        if (opt == 1) {
                                llist_add_to(&zaccept, optarg);
                                break;
                        }
                        if (opt == 'd') {
                                base_dir = optarg;
                                opt_range += 2;
                                break;
                        }
                        if (opt == 'x') {
                                opt_range++;
                                break;
                        }
                        bb_show_usage();

                case 2 : /* Exclude files */
                        if (opt == 1) {
                                llist_add_to(&zreject, optarg);
                                break;
                        }
                        if (opt == 'd') { /* Extract to base directory */
                                base_dir = optarg;
                                opt_range++;
                                break;
                        }
                        /* fall through */

                default:
                        bb_show_usage();
                }
        }

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

        /* Open input file */
        if (LONE_DASH(src_fn)) {
                xdup2(STDIN_FILENO, zip_fd);
                /* Cannot use prompt mode since zip data is arriving on STDIN */
                if (overwrite == O_PROMPT)
                        overwrite = O_NEVER;
        } else {
                static const char extn[][5] = {"", ".zip", ".ZIP"};
                int orig_src_fn_len = strlen(src_fn);
                int src_fd = -1;

                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("can't open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
                }
                xmove_fd(src_fd, zip_fd);
        }

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

        if (quiet <= 1) { /* not -qq */
                if (quiet == 0)
                        printf("Archive:  %s\n", src_fn);
                if (listing) {
                        puts(verbose ?
                                " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
                                "--------  ------  ------- -----   ----   ----   ------    ----"
                                :
                                "  Length     Date   Time    Name\n"
                                " --------    ----   ----    ----"
                                );
                }
        }

/* Example of an archive with one 0-byte long file named 'z'
 * created by Zip 2.31 on Unix:
 * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
 *       sig........ vneed flags compr mtime mdate crc32>
 * 0010  00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
 *      >..... csize...... usize...... fnlen exlen fn ex>
 * 0020  54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
 *      >tra_field......................................
 * 0030  00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
 *       ........... sig........ vmade vneed flags compr
 * 0040  42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
 *       mtime mdate crc32...... csize...... usize......
 * 0050  01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
 *       fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
 * 0060  00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
 *      >..... fn extra_field...........................
 * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
 * 0080  34 00 00 00 00 00                               |4.....|
 */
        total_usize = 0;
        total_size = 0;
        total_entries = 0;
#if ENABLE_DESKTOP
        cdf_offset = 0;
#endif
        while (1) {
                uint32_t magic;
                mode_t dir_mode = 0777;
#if ENABLE_DESKTOP
                mode_t file_mode = 0666;
#endif

                /* Check magic number */
                xread(zip_fd, &magic, 4);
                /* Central directory? It's at the end, so exit */
                if (magic == ZIP_CDF_MAGIC)
                        break;
#if ENABLE_DESKTOP
                /* Data descriptor? It was a streaming file, go on */
                if (magic == ZIP_DD_MAGIC) {
                        /* skip over duplicate crc32, cmpsize and ucmpsize */
                        unzip_skip(3 * 4);
                        continue;
                }
#endif
                if (magic != ZIP_FILEHEADER_MAGIC)
                        bb_error_msg_and_die("invalid zip magic %08X", (int)magic);

                /* Read the file header */
                xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
                FIX_ENDIANNESS_ZIP(zip_header);
                if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
                        bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
                }
#if !ENABLE_DESKTOP
                if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
                        bb_error_msg_and_die("zip flags 1 and 8 are not supported");
                }
#else
                if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
                        /* 0x0001 - encrypted */
                        bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
                }

                {
                        cdf_header_t cdf_header;
                        cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
                        if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
                                /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
                                 * only from Central Directory. See unzip_doc.txt */
                                zip_header.formatted.crc32    = cdf_header.formatted.crc32;
                                zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
                                zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
                        }
                        if ((cdf_header.formatted.version_made_by >> 8) == 3) {
                                /* this archive is created on Unix */
                                dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
                        }
                }
#endif

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

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

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

                } else { /* Extract entry */
                        if (listing) { /* List entry */
                                unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
                                if (!verbose) {
                                        //      "  Length     Date   Time    Name\n"
                                        //      " --------    ----   ----    ----"
                                        printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
                                                (unsigned)zip_header.formatted.ucmpsize,
                                                (dostime & 0x01e00000) >> 21,
                                                (dostime & 0x001f0000) >> 16,
                                                (((dostime & 0xfe000000) >> 25) + 1980) % 100,
                                                (dostime & 0x0000f800) >> 11,
                                                (dostime & 0x000007e0) >> 5,
                                                dst_fn);
                                        total_usize += zip_header.formatted.ucmpsize;
                                } else {
                                        unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
                                        percents = percents * 100;
                                        if (zip_header.formatted.ucmpsize)
                                                percents /= zip_header.formatted.ucmpsize;
                                        //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
                                        //      "--------  ------  ------- -----   ----   ----   ------    ----"
                                        printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
                                                (unsigned)zip_header.formatted.ucmpsize,
                                                (unsigned)zip_header.formatted.cmpsize,
                                                (unsigned)percents,
                                                (dostime & 0x01e00000) >> 21,
                                                (dostime & 0x001f0000) >> 16,
                                                (((dostime & 0xfe000000) >> 25) + 1980) % 100,
                                                (dostime & 0x0000f800) >> 11,
                                                (dostime & 0x000007e0) >> 5,
                                                zip_header.formatted.crc32,
                                                dst_fn);
                                        total_usize += zip_header.formatted.ucmpsize;
                                        total_size += zip_header.formatted.cmpsize;
                                }
                                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("can't stat '%s'", dst_fn);
                                        }
                                        if (!quiet) {
                                                printf("   creating: %s\n", dst_fn);
                                        }
                                        unzip_create_leading_dirs(dst_fn);
                                        if (bb_make_directory(dst_fn, dir_mode, 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("can't 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, sizeof(key_buf), stdin)) {
                                                                bb_perror_msg_and_die("can't 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);
#if ENABLE_DESKTOP
                        dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
#else
                        dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
#endif
                case -1: /* Unzip */
                        if (!quiet) {
                                printf("  inflating: %s\n", dst_fn);
                        }
                        unzip_extract(&zip_header, dst_fd);
                        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(zip_header.formatted.cmpsize);
                        break;

                case 'r':
                        /* Prompt for new name */
                        printf("new name: ");
                        if (!fgets(key_buf, sizeof(key_buf), stdin)) {
                                bb_perror_msg_and_die("can't 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;
                }

                total_entries++;
        }

        if (listing && quiet <= 1) {
                if (!verbose) {
                        //      "  Length     Date   Time    Name\n"
                        //      " --------    ----   ----    ----"
                        printf( " --------                   -------\n"
                                "%9lu"   "                   %u files\n",
                                total_usize, total_entries);
                } else {
                        unsigned long percents = total_usize - total_size;
                        percents = percents * 100;
                        if (total_usize)
                                percents /= total_usize;
                        //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
                        //      "--------  ------  ------- -----   ----   ----   ------    ----"
                        printf( "--------          -------  ---                            -------\n"
                                "%8lu"              "%17lu%4u%%                            %u files\n",
                                total_usize, total_size, (unsigned)percents,
                                total_entries);
                }
        }

        return 0;
}