/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ /* * File-Roller * * Copyright (C) 2001 The Free Software Foundation, Inc. * * 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 Street #330, Boston, MA 02110-1301, USA. */ #include <config.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <glib.h> static const char * get_mime_type_from_magic_numbers (char *buffer) { static struct { const char *mime_type; const char *first_bytes; int offset; int len; } sniffer_data [] = { { "application/x-bzip2", "BZh", 0, 3 }, { "application/x-gzip", "\037\213", 0, 2 }, { "application/x-xz", "\3757zXZ\000", 0, 6 }, { NULL, NULL, 0 } }; int i; for (i = 0; sniffer_data[i].mime_type != NULL; i++) if (memcmp (sniffer_data[i].first_bytes, buffer + sniffer_data[i].offset, sniffer_data[i].len) == 0) { return sniffer_data[i].mime_type; } return NULL; } int main (int argc, char **argv) { const char *filename; GString *cpio_args; int i; FILE *stream; guchar bytes[8]; int il, dl, sigsize, offset; const char *mime_type; const char *archive_command; char *command; if (argc < 3) return 0; filename = argv[1]; cpio_args = g_string_new (argv[2]); for (i = 3; i < argc; i++) { g_string_append (cpio_args, " "); g_string_append (cpio_args, argv[i]); } stream = fopen (filename, "r"); if (stream == NULL) return 1; if (fseek (stream, 104 , SEEK_CUR) != 0) { fclose (stream); return 1; } if (fread (bytes, 1, 8, stream) == 0) { fclose (stream); return 1; } il = 256 * (256 * (256 * bytes[0] + bytes[1]) + bytes[2]) + bytes[3]; dl = 256 * (256 * (256 * bytes[4] + bytes[5]) + bytes[6]) + bytes[7]; sigsize = 8 + 16 * il + dl; offset = 104 + sigsize + (8 - (sigsize % 8)) % 8 + 8; if (fseek (stream, offset, SEEK_SET) != 0) { fclose (stream); return 1; } if (fread (bytes, 1, 8, stream) == 0) { fclose (stream); return 1; } il = 256 * (256 * (256 * bytes[0] + bytes[1]) + bytes[2]) + bytes[3]; dl = 256 * (256 * (256 * bytes[4] + bytes[5]) + bytes[6]) + bytes[7]; sigsize = 8 + 16 * il + dl; offset = offset + sigsize; /* get the payload type */ if (fseek (stream, offset, SEEK_SET) != 0) { fclose (stream); return 1; } if (fread (bytes, 1, 8, stream) == 0) { fclose (stream); return 1; } mime_type = get_mime_type_from_magic_numbers ((char *)bytes); if (mime_type == NULL) archive_command = "lzma -dc"; else if (strcmp (mime_type, "application/x-xz") == 0) archive_command = "xz -dc"; else if (strcmp (mime_type, "application/x-gzip") == 0) archive_command = "gzip -dc"; else archive_command = "bzip2 -dc"; fclose (stream); command = g_strdup_printf ("sh -c \"dd if=%s ibs=%u skip=1 2>/dev/null | %s | cpio %s\"", g_shell_quote (filename), offset, archive_command, cpio_args->str); return system (command); }