/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Read-Only HDFS Virtual File Driver (VFD)                                  *
 * Copyright (c) 2018, The HDF Group.                                        *
 *                                                                           *
 * All rights reserved.                                                      *
 *                                                                           *
 * NOTICE:                                                                   *
 * All information contained herein is, and remains, the property of The HDF *
 * Group. The intellectual and technical concepts contained herein are       *
 * proprietary to The HDF Group. Dissemination of this information or        *
 * reproduction of this material is strictly forbidden unless prior written  *
 * permission is obtained from The HDF Group.                                *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Programmer:  Jacob Smith
 *              2018-04-23
 *
 * Purpose:	The public header file for the hdfs driver.
 */

#ifndef H5FDhdfs_H
#define H5FDhdfs_H

#ifdef H5_HAVE_LIBHDFS
#define H5FD_HDFS       (H5FD_hdfs_init())
#else /* H5_HAVE_LIBHDFS */
#define H5FD_HDFS       (-1)
#endif /* H5_HAVE_LIBHDFS */

/****************************************************************************
 *
 * Structure: H5FD_hdfs_fapl_t
 *
 * Purpose:
 *
 *     H5FD_hdfs_fapl_t is a public structure that is used to pass
 *     configuration information to the appropriate HDFS VFD via the FAPL.
 *     A pointer to an instance of this structure is a parameter to
 *     H5Pset_fapl_hdfs() and H5Pget_fapl_hdfs().
 *
 *
 *
 * `version` (int32_t)
 *
 *     Version number of the `H5FD_hdfs_fapl_t` structure.  Any instance passed
 *     to the above calls must have a recognized version number, or an error
 *     will be flagged.
 *
 *     This field should be set to `H5FD__CURR_HDFS_FAPL_T_VERSION`.
 *
 * `namenode_name` (const char[])
 *
 *     Name of "Name Node" to access as the HDFS server.
 *
 *     Must not be longer than `H5FD__HDFS_NODE_NAME_SPACE`.
 *
 *     TBD: Can be NULL.
 *
 * `namenode_port` (int32_t) TBD
 *
 *     Port number to use to connect with Name Node.
 *
 *     TBD: If 0, uses a default port.
 *
 * `kerberos_ticket_cache` (const char[])
 *
 *     Path to the location of the Kerberos authentication cache.
 *
 *     Must not be longer than `H5FD__HDFS_KERB_CACHE_PATH_SPACE`.
 *
 *     TBD: Can be NULL.
 *
 * `user_name` (const char[])
 *
 *     Username to use when accessing file.
 *
 *     Must not be longer than `H5FD__HDFS_USER_NAME_SPACE`.
 *
 *     TBD: Can be NULL.
 *
 * `stream_buffer_size` (int32_t)
 *
 *     Size (in bytes) of the file read stream buffer.
 *
 *     TBD: If -1, relies on a default value.
 *
 *
 *
 * Programmer: Jacob Smith
 *             2018-04-23
 *
 ****************************************************************************/

#define H5FD__CURR_HDFS_FAPL_T_VERSION 1

#define H5FD__HDFS_NODE_NAME_SPACE 128
#define H5FD__HDFS_USER_NAME_SPACE 128
#define H5FD__HDFS_KERB_CACHE_PATH_SPACE 128

typedef struct H5FD_hdfs_fapl_t {
    int32_t version;
    char    namenode_name[H5FD__HDFS_NODE_NAME_SPACE + 1];
    int32_t namenode_port;
    char    user_name[H5FD__HDFS_USER_NAME_SPACE + 1];
    char    kerberos_ticket_cache[H5FD__HDFS_KERB_CACHE_PATH_SPACE + 1];
    int32_t stream_buffer_size;
} H5FD_hdfs_fapl_t;

#ifdef __cplusplus
extern "C" {
#endif

H5_DLL hid_t H5FD_hdfs_init(void);
H5_DLL herr_t H5Pget_fapl_hdfs(hid_t fapl_id, H5FD_hdfs_fapl_t *fa_out);
H5_DLL herr_t H5Pset_fapl_hdfs(hid_t fapl_id, H5FD_hdfs_fapl_t *fa);

#ifdef __cplusplus
}
#endif

#endif /* ifndef H5FDhdfs_H */

