diff options
Diffstat (limited to 'archival/unzip.c')
| -rw-r--r-- | archival/unzip.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/archival/unzip.c b/archival/unzip.c new file mode 100644 index 0000000..8b1c281 --- /dev/null +++ b/archival/unzip.c @@ -0,0 +1,386 @@ +/* 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; +} |