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/*
This file is part of libextractor.
Copyright (C) 2012 Christian Grothoff
libextractor 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 3, or (at your
option) any later version.
libextractor 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 libextractor; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file plugins/archive_extractor.c
* @brief plugin to support archives (such as TAR)
* @author Christian Grothoff
*/
#include "platform.h"
#include "extractor.h"
#include <archive.h>
#include <archive_entry.h>
/**
* Callback for libarchive for 'reading'.
*
* @param a archive handle
* @param client_data our 'struct EXTRACTOR_ExtractContext'
* @param buff where to store data with pointer to data
* @return number of bytes read
*/
static ssize_t
read_cb (struct archive *a,
void *client_data,
const void **buff)
{
struct EXTRACTOR_ExtractContext *ec = client_data;
ssize_t ret;
*buff = NULL;
if (-1 == (ret = ec->read (ec->cls, (void **) buff, 16 * 1024)))
return ARCHIVE_FATAL;
return ret;
}
/**
* Older versions of libarchive do not define __LA_INT64_T.
*/
#if ARCHIVE_VERSION_NUMBER < 2000000
#define __LA_INT64_T size_t
#else
#ifndef __LA_INT64_T
#define __LA_INT64_T int64_t
#endif
#endif
/**
* Callback for libarchive for 'skipping'.
*
* @param a archive handle
* @param client_data our 'struct EXTRACTOR_ExtractContext'
* @param request number of bytes to skip
* @return number of bytes skipped
*/
static __LA_INT64_T
skip_cb (struct archive *a,
void *client_data,
__LA_INT64_T request)
{
struct EXTRACTOR_ExtractContext *ec = client_data;
if (-1 == ec->seek (ec->cls, request, SEEK_CUR))
return 0;
return request;
}
/**
* Main entry method for the ARCHIVE extraction plugin.
*
* @param ec extraction context provided to the plugin
*/
void
EXTRACTOR_archive_extract_method (struct EXTRACTOR_ExtractContext *ec)
{
struct archive *a;
struct archive_entry *entry;
const char *fname;
const char *s;
char *format;
format = NULL;
a = archive_read_new ();
#if ARCHIVE_VERSION_NUMBER >= 3000000
archive_read_support_filter_all (a);
#else
archive_read_support_compression_all (a);
#endif
archive_read_support_format_all (a);
if (archive_read_open2 (a, ec, NULL, &read_cb, &skip_cb, NULL)!= ARCHIVE_OK)
return;
while (ARCHIVE_OK == archive_read_next_header (a, &entry))
{
if ( (NULL == format) &&
(NULL != (fname = archive_format_name (a))) )
format = strdup (fname);
s = archive_entry_pathname (entry);
if (0 != ec->proc (ec->cls,
"tar",
EXTRACTOR_METATYPE_FILENAME,
EXTRACTOR_METAFORMAT_UTF8,
"text/plain",
s, strlen (s) + 1))
break;
}
#if ARCHIVE_VERSION_NUMBER >= 3000000
archive_read_free (a);
#else
archive_read_finish (a);
#endif
if (NULL != format)
{
if (0 != ec->proc (ec->cls,
"tar",
EXTRACTOR_METATYPE_FORMAT,
EXTRACTOR_METAFORMAT_UTF8,
"text/plain", format, strlen (format) + 1))
{
free (format);
return;
}
free (format);
}
}
/* end of tar_extractor.c */
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