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/* -*- 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 02111-1307, 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);
}
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