1 files changed, 124 insertions, 0 deletions

diff --git a/src/plugins/archive_extractor.c b/src/plugins/archive_extractor.c
new file mode 100644
index 0000000..ef4e7c7
--- /dev/null
+++ b/src/plugins/archive_extractor.c
@@ -0,0 +1,124 @@
+/*
+     This file is part of libextractor.
+     (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., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, 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;
+}
+
+
+/**
+ * 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 ();
+  archive_read_support_compression_all (a);
+  archive_read_support_format_all (a);
+  archive_read_open2 (a, ec, NULL, &read_cb, &skip_cb, NULL);
+  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;
+    }
+  archive_read_finish (a);
+  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 */