/* vi: set sw=4 ts=4: */ /* * Mini unzip implementation for busybox * * Copyright (C) 2001 by Laurence Anderson * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ /* For reference to format see http://www.pkware.com/support/appnote.html */ /* TODO Endian issues, exclude, should we accept input from stdin ? */ #include #include #include #include #include #include "unarchive.h" #include "busybox.h" #define ZIP_FILEHEADER_MAGIC 0x04034b50 #define ZIP_CDS_MAGIC 0x02014b50 #define ZIP_CDS_END_MAGIC 0x06054b50 #define ZIP_DD_MAGIC 0x08074b50 extern unsigned int gunzip_crc; extern unsigned int gunzip_bytes_out; static void header_list_unzip(const file_header_t *file_header) { printf(" inflating: %s\n", file_header->name); } static void header_verbose_list_unzip(const file_header_t *file_header) { unsigned int dostime = (unsigned int) file_header->mtime; /* can printf arguments cut of the decade component ? */ unsigned short year = 1980 + ((dostime & 0xfe000000) >> 25); while (year >= 100) { year -= 100; } printf("%9u %02u-%02u-%02u %02u:%02u %s\n", (unsigned int) file_header->size, (dostime & 0x01e00000) >> 21, (dostime & 0x001f0000) >> 16, year, (dostime & 0x0000f800) >> 11, (dostime & 0x000007e0) >> 5, file_header->name); } extern int unzip_main(int argc, char **argv) { 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 */ } formated __attribute__ ((packed)); } zip_header; archive_handle_t *archive_handle; unsigned int total_size = 0; unsigned int total_entries = 0; char *base_dir = NULL; int opt = 0; /* Initialise */ archive_handle = init_handle(); archive_handle->action_data = NULL; archive_handle->action_header = header_list_unzip; while ((opt = getopt(argc, argv, "lnopqd:")) != -1) { switch (opt) { case 'l': /* list */ archive_handle->action_header = header_verbose_list_unzip; archive_handle->action_data = data_skip; break; case 'n': /* never overwright existing files */ break; case 'o': archive_handle->flags = ARCHIVE_EXTRACT_UNCONDITIONAL; break; case 'p': /* extract files to stdout */ archive_handle->action_data = data_extract_to_stdout; break; case 'q': /* Extract files quietly */ archive_handle->action_header = header_skip; break; case 'd': /* Extract files to specified base directory*/ base_dir = optarg; break; #if 0 case 'x': /* Exclude the specified files */ archive_handle->filter = filter_accept_reject_list; break; #endif default: bb_show_usage(); } } if (argc == optind) { bb_show_usage(); } printf("Archive: %s\n", argv[optind]); if (archive_handle->action_header == header_verbose_list_unzip) { printf(" Length Date Time Name\n"); printf(" -------- ---- ---- ----\n"); } if (*argv[optind] == '-') { archive_handle->src_fd = fileno(stdin); archive_handle->seek = seek_by_char; } else { archive_handle->src_fd = bb_xopen(argv[optind++], O_RDONLY); } if ((base_dir) && (chdir(base_dir))) { bb_perror_msg_and_die("Couldnt chdir"); } while (optind < argc) { archive_handle->filter = filter_accept_list; archive_handle->accept = llist_add_to(archive_handle->accept, argv[optind]); optind++; } while (1) { unsigned int magic; int dst_fd; /* TODO Endian issues */ archive_xread_all(archive_handle, &magic, 4); archive_handle->offset += 4; if (magic == ZIP_CDS_MAGIC) { break; } else if (magic != ZIP_FILEHEADER_MAGIC) { bb_error_msg_and_die("Invlaide zip magic"); } /* Read the file header */ archive_xread_all(archive_handle, zip_header.raw, 26); archive_handle->offset += 26; archive_handle->file_header->mode = S_IFREG | 0777; if (zip_header.formated.method != 8) { bb_error_msg_and_die("Unsupported compression method %d\n", zip_header.formated.method); } /* Read filename */ archive_handle->file_header->name = xmalloc(zip_header.formated.filename_len + 1); archive_xread_all(archive_handle, archive_handle->file_header->name, zip_header.formated.filename_len); archive_handle->offset += zip_header.formated.filename_len; archive_handle->file_header->name[zip_header.formated.filename_len] = '\0'; /* Skip extra header bits */ archive_handle->file_header->size = zip_header.formated.extra_len; data_skip(archive_handle); archive_handle->offset += zip_header.formated.extra_len; /* Handle directories */ archive_handle->file_header->mode = S_IFREG | 0777; if (last_char_is(archive_handle->file_header->name, '/')) { archive_handle->file_header->mode ^= S_IFREG; archive_handle->file_header->mode |= S_IFDIR; } /* Data section */ archive_handle->file_header->size = zip_header.formated.cmpsize; if (archive_handle->action_data) { archive_handle->action_data(archive_handle); } else { dst_fd = bb_xopen(archive_handle->file_header->name, O_WRONLY | O_CREAT); inflate(archive_handle->src_fd, dst_fd); close(dst_fd); chmod(archive_handle->file_header->name, archive_handle->file_header->mode); /* Validate decompression - crc */ if (zip_header.formated.crc32 != (gunzip_crc ^ 0xffffffffL)) { bb_error_msg("Invalid compressed data--crc error"); } /* Validate decompression - size */ if (gunzip_bytes_out != zip_header.formated.ucmpsize) { bb_error_msg("Invalid compressed data--length error"); } } /* local file descriptor section */ archive_handle->offset += zip_header.formated.cmpsize; /* This ISNT unix time */ archive_handle->file_header->mtime = zip_header.formated.modtime | (zip_header.formated.moddate << 16); archive_handle->file_header->size = zip_header.formated.ucmpsize; total_size += archive_handle->file_header->size; total_entries++; archive_handle->action_header(archive_handle->file_header); /* Data descriptor section */ if (zip_header.formated.flags & 4) { /* skip over duplicate crc, compressed size and uncompressed size */ unsigned short i; for (i = 0; i != 12; i++) { archive_xread_char(archive_handle); } archive_handle->offset += 12; } } /* Central directory section */ if (archive_handle->action_header == header_verbose_list_unzip) { printf(" -------- -------\n"); printf("%9d %d files\n", total_size, total_entries); } return(EXIT_SUCCESS); }