GnomeVFSC语言统一文件系统接口

GnomeVFS 是一个 C 语言的库，提供了统一的接口用来访问各种不同的文件系统，支持包括：WebDAV, ftp, 本地文件系统, gzip, bzip2, cdda 等多种文件系统。

示例代码：

static GnomeVFSResult
do_read (GnomeVFSMethod       *method,
          GnomeVFSMethodHandle *method_handle,
          gpointer              buffer,
          GnomeVFSFileSize      bytes,
          GnomeVFSFileSize     *bytes_read,
          GnomeVFSContext      *context)
{
   FileHandle *handle = (FileHandle *) method_handle;
   if (!handle->str) {
      /* This is the first pass, get the content string. */
      handle->str = g_strdup (handle->fnode->content);
      handle->size = handle->fnode->size;
      handle->bytes_written = 0;
   }
   if (handle->bytes_written >= handle->len) {
       /* The whole file is read, return EOF. */
       *bytes_read = 0;
      return GNOME_VFS_ERROR_EOF;
    }
   *bytes_read = MIN (bytes, handle->size - handle->bytes_written);
   memcpy (buffer, handle->str + handle->bytes_written, *bytes_read);
   handle->bytes_written += *bytes_read;
   return GNOME_VFS_OK;
}