diff options
Diffstat (limited to 'archival/libunarchive/get_header_zip.c')
| -rw-r--r-- | archival/libunarchive/get_header_zip.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/archival/libunarchive/get_header_zip.c b/archival/libunarchive/get_header_zip.c deleted file mode 100644 index 5fa3a6c..0000000 --- a/archival/libunarchive/get_header_zip.c +++ /dev/null @@ -1,171 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * get_header_zip 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 - */ - -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include "unarchive.h" -#include "libbb.h" - -#define ZIP_FILEHEADER_MAGIC 0x04034b50 -#define ZIP_CDS_MAGIC 0x02014b50 -#define ZIP_CDS_END_MAGIC 0x06054b50 -#define ZIP_DD_MAGIC 0x08074b50 - - -enum { - zh_version, - zh_flags, - zh_method, - zh_modtime, - zh_moddate, - zh_crc32, - zh_cmpsize, - zh_ucmpsize, - zh_filename_len, - zh_extra_len -}; - -static const char fail_msg[] = "Invalid file or read error"; - -static int le_read_int(FILE *fp, int n) -{ - int r = 0; - int s = 1; - int c; - - archive_offset += n; - - do { - if ((c = fgetc(fp)) == EOF) { - error_msg_and_die(fail_msg); - } - r += s * c; - s <<= 8; - } while (--n); - - return r; -} - -static void read_header(FILE *fp, int *zh) -{ - static const char s[] = { 2, 2, 2, 2, 2, 4, 4, 4, 2, 2, 0 }; - int i = 0; - - do { - zh[i] = le_read_int(fp, s[i]); - } while (s[++i]); -} - -file_header_t *get_header_zip(FILE *zip_stream) -{ - int zip_header[10]; - file_header_t *zip_entry = NULL; - int magic, tmpmagic; - /* If dd_ahead is true, we didn't know the last extracted file's length. */ - static int dd_ahead = 0; - - magic = le_read_int(zip_stream, 4); - - checkmagic: - switch (magic) { - case ZIP_FILEHEADER_MAGIC: - zip_entry = xcalloc(1, sizeof(file_header_t)); - - read_header(zip_stream, zip_header); - - if (zip_header[zh_method] == 8) { - zip_entry->extract_func = &inflate; - } else if (zip_header[zh_method] != 0) { - error_msg_and_die("Unsupported compression method %d\n", - zip_header[zh_method]); - } - - zip_entry->name = xmalloc(zip_header[zh_filename_len] + 1); - if (!fread(zip_entry->name, zip_header[zh_filename_len], 1, zip_stream)) { - error_msg_and_die(fail_msg); - } - archive_offset += zip_header[zh_filename_len]; - - seek_sub_file(zip_stream, zip_header[zh_extra_len]); - - zip_entry->size = zip_header[zh_cmpsize]; - - zip_entry->mode = S_IFREG | 0777; - - /* Time/Date? */ - - zip_entry->name[zip_header[zh_filename_len]] = 0; - if (*(zip_entry->name + zip_header[zh_filename_len] - 1) == '/') { - /* Files that end in a / are directories */ - /* Remove trailing / so unarchive doesn't get confused */ - *(zip_entry->name + zip_header[zh_filename_len] - 1) = '\0'; - zip_entry->mode ^= S_IFREG; - zip_entry->mode |= S_IFDIR; - } - - if (zip_header[zh_flags] & 0x8) { - /* crc32, and sizes are in the data description _after_ the file */ - if (zip_header[zh_cmpsize] == 0) { - /* As we don't know how long this file it is difficult to skip! - * but it is compressed, so normally its ok */ - dd_ahead = 1; - } - if (zip_header[zh_ucmpsize] != 0) { - /* Humm... we would otherwise skip this twice - not good! */ - dd_ahead = 2; - } - } - break; - - case ZIP_CDS_MAGIC: /* FALLTHRU */ - case ZIP_CDS_END_MAGIC: - return(NULL); - break; - - case ZIP_DD_MAGIC: { - int cmpsize; - seek_sub_file(zip_stream, 4); // Skip crc32 - cmpsize = le_read_int(zip_stream, 4); - if (dd_ahead == 1) archive_offset += cmpsize; - seek_sub_file(zip_stream, 4); // Skip uncompressed size - dd_ahead = 0; - return (get_header_zip(zip_stream)); - break; } - - default: - if (!dd_ahead) error_msg("Invalid magic (%#x): Trying to skip junk", magic); - dd_ahead = 0; - while ((tmpmagic = fgetc(zip_stream)) != EOF) { - archive_offset++; - magic = ((magic >> 8) & 0x00ffffff) | ((tmpmagic << 24) & 0xff000000); - if (magic == ZIP_FILEHEADER_MAGIC - || magic == ZIP_CDS_MAGIC - || magic == ZIP_CDS_END_MAGIC) { - goto checkmagic; - } - } - error_msg_and_die(fail_msg); - } - - return(zip_entry); -} |