+static const int max_file_size = 1024 * 1024;
+
+static int read_file(struct discover_context *ctx,
+ const char *filename, char **bufp, int *lenp)
+{
+ struct stat statbuf;
+ int rc, fd, i, len;
+ char *buf;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return -1;
+
+ rc = fstat(fd, &statbuf);
+ if (rc < 0)
+ goto err_close;
+
+ len = statbuf.st_size;
+ if (len > max_file_size)
+ goto err_close;
+
+ buf = talloc_array(ctx, char, len);
+ if (!buf)
+ goto err_close;
+
+ for (i = 0; i < len; i += rc) {
+ rc = read(fd, buf + i, len - i);
+
+ /* unexpected EOF: trim and return */
+ if (rc == 0) {
+ len = i;
+ break;
+ }
+
+ if (rc < 0)
+ goto err_free;
+
+ }
+
+ close(fd);
+ *bufp = buf;
+ *lenp = len;
+ return 0;
+
+err_free:
+ talloc_free(buf);
+err_close:
+ close(fd);
+ return -1;
+}
+
+static void iterate_parser_files(struct discover_context *ctx,
+ const struct parser *parser)
+{
+ const char * const *filename;
+ const char *path, *url;
+ unsigned int tempfile;
+
+ if (!parser->filenames)
+ return;
+
+ for (filename = parser->filenames; *filename; filename++) {
+ int rc, len;
+ char *buf;
+
+ url = resolve_path(ctx, *filename, ctx->device->device_path);
+ if (!url)
+ continue;
+
+ path = load_file(ctx, url, &tempfile);
+
+ if (!path)
+ continue;
+
+ rc = read_file(ctx, path, &buf, &len);
+ if (!rc) {
+ parser->parse(ctx, buf, len);
+ talloc_free(buf);
+ }
+
+ if (tempfile)
+ unlink(path);
+
+ }
+
+}
+