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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Onion Virtual File Driver (VFD)
*
* Purpose: Interface for the onion file's header
*/
#ifndef H5FDonion_header_H
#define H5FDonion_header_H
/* Number of bytes to encode fixed-size components */
#define H5FD_ONION_ENCODED_SIZE_HEADER 40
/* Flags must align exactly one per bit, up to 24 bits */
#define H5FD_ONION_HEADER_FLAG_WRITE_LOCK 0x1
#define H5FD_ONION_HEADER_FLAG_DIVERGENT_HISTORY 0x2
#define H5FD_ONION_HEADER_FLAG_PAGE_ALIGNMENT 0x4
#define H5FD_ONION_HEADER_SIGNATURE "OHDH"
#define H5FD_ONION_HEADER_VERSION_CURR 1
/* In-memory representation of the on-store onion history file header.
*/
typedef struct H5FD_onion_header_t {
uint8_t version;
uint32_t flags; /* At most three bytes used! */
uint32_t page_size;
uint64_t origin_eof; /* Size of the 'original' canonical file */
uint64_t history_addr;
uint64_t history_size;
uint32_t checksum;
} H5FD_onion_header_t;
#ifdef __cplusplus
extern "C" {
#endif
H5_DLL herr_t H5FD__onion_ingest_header(H5FD_onion_header_t *hdr_out, H5FD_t *raw_file, haddr_t addr);
H5_DLL herr_t H5FD__onion_write_header(H5FD_onion_header_t *header, H5FD_t *file);
H5_DLL size_t H5FD__onion_header_decode(unsigned char *buf, H5FD_onion_header_t *header);
H5_DLL size_t H5FD__onion_header_encode(H5FD_onion_header_t *header, unsigned char *buf, uint32_t *checksum);
#ifdef __cplusplus
}
#endif
#endif /* H5FDonion_header_H */
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