curl tool: reviewed code moved to tool_*.[ch] files

src/tool_xattr.c

@@ -0,0 +1,78 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "setup.h"
+
+#ifdef HAVE_FSETXATTR
+#  include <sys/xattr.h> /* header from libc, not from libattr */
+#endif
+
+#include <curl/curl.h>
+
+#include "tool_xattr.h"
+
+#include "memdebug.h" /* keep this as LAST include */
+
+#ifdef HAVE_FSETXATTR
+
+/* mapping table of curl metadata to extended attribute names */
+static const struct xattr_mapping {
+  const char *attr; /* name of the xattr */
+  CURLINFO info;
+} mappings[] = {
+  /* mappings proposed by
+   * http://freedesktop.org/wiki/CommonExtendedAttributes
+   */
+  { "user.xdg.origin.url", CURLINFO_EFFECTIVE_URL },
+  { "user.mime_type",      CURLINFO_CONTENT_TYPE },
+  { NULL,                  CURLINFO_NONE } /* last element, abort loop here */
+};
+
+/* store metadata from the curl request alongside the downloaded
+ * file using extended attributes
+ */
+int fwrite_xattr(CURL *curl, int fd)
+{
+  int i = 0;
+  int err = 0;
+  /* loop through all xattr-curlinfo pairs and abort on a set error */
+  while(err == 0 && mappings[i].attr != NULL) {
+    char *value = NULL;
+    CURLcode rc = curl_easy_getinfo(curl, mappings[i].info, &value);
+    if(rc == CURLE_OK && value) {
+#ifdef HAVE_FSETXATTR_6
+      err = fsetxattr(fd, mappings[i].attr, value, strlen(value), 0, 0);
+#elif defined(HAVE_FSETXATTR_5)
+      err = fsetxattr(fd, mappings[i].attr, value, strlen(value), 0);
+#endif
+    }
+    i++;
+  }
+  return err;
+}
+#else
+int fwrite_xattr(CURL *curl, int fd)
+{
+  (void)curl;
+  (void)fd;
+  return 0;
+}
+#endif