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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: Code for the onion file's header
*/
/* This source code file is part of the H5FD driver module */
#include "H5FDdrvr_module.h"
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5FDprivate.h" /* File drivers */
#include "H5FDonion.h" /* Onion file driver */
#include "H5FDonion_priv.h" /* Onion file driver internals */
#include "H5MMprivate.h" /* Memory management */
/*-----------------------------------------------------------------------------
* Function: H5FD_ingest_header
*
* Purpose: Read and decode the history header information from `raw_file`
* at `addr`, and store the decoded information in the structure
* at `hdr_out`.
*
* Return: SUCCEED/FAIL
*-----------------------------------------------------------------------------
*/
herr_t
H5FD__onion_ingest_header(H5FD_onion_header_t *hdr_out, H5FD_t *raw_file, haddr_t addr)
{
unsigned char *buf = NULL;
herr_t ret_value = SUCCEED;
haddr_t size = (haddr_t)H5FD_ONION_ENCODED_SIZE_HEADER;
uint32_t sum = 0;
FUNC_ENTER_PACKAGE
if (H5FD_get_eof(raw_file, H5FD_MEM_DRAW) < (addr + size))
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "header indicates history beyond EOF")
if (NULL == (buf = H5MM_malloc(sizeof(char) * size)))
HGOTO_ERROR(H5E_VFL, H5E_CANTALLOC, FAIL, "can't allocate buffer space")
if (H5FD_set_eoa(raw_file, H5FD_MEM_DRAW, (addr + size)) < 0)
HGOTO_ERROR(H5E_VFL, H5E_CANTSET, FAIL, "can't modify EOA")
if (H5FD_read(raw_file, H5FD_MEM_DRAW, addr, size, buf) < 0)
HGOTO_ERROR(H5E_VFL, H5E_READERROR, FAIL, "can't read history header from file")
if (H5FD__onion_header_decode(buf, hdr_out) == 0)
HGOTO_ERROR(H5E_VFL, H5E_CANTDECODE, FAIL, "can't decode history header")
sum = H5_checksum_fletcher32(buf, size - 4);
if (hdr_out->checksum != sum)
HGOTO_ERROR(H5E_VFL, H5E_BADVALUE, FAIL, "checksum mismatch between buffer and stored")
done:
H5MM_xfree(buf);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__onion_ingest_header() */
/*-------------------------------------------------------------------------
* Function: H5FD__onion_write_header
*
* Purpose: Write in-memory history header to appropriate backing file.
* Overwrites existing header data.
*
* Return: SUCCEED/FAIL
*-------------------------------------------------------------------------
*/
herr_t
H5FD__onion_write_header(H5FD_onion_header_t *header, H5FD_t *file)
{
uint32_t sum = 0; /* Not used, but required by the encoder */
uint64_t size = 0;
unsigned char *buf = NULL;
herr_t ret_value = SUCCEED;
FUNC_ENTER_PACKAGE
if (NULL == (buf = H5MM_malloc(H5FD_ONION_ENCODED_SIZE_HEADER)))
HGOTO_ERROR(H5E_VFL, H5E_CANTALLOC, FAIL, "can't allocate buffer for updated history header")
if (0 == (size = H5FD__onion_header_encode(header, buf, &sum)))
HGOTO_ERROR(H5E_VFL, H5E_BADVALUE, FAIL, "problem encoding updated history header")
if (H5FD_write(file, H5FD_MEM_DRAW, 0, (haddr_t)size, buf) < 0)
HGOTO_ERROR(H5E_VFL, H5E_WRITEERROR, FAIL, "can't write updated history header")
done:
H5MM_xfree(buf);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__onion_write_header()*/
/*-----------------------------------------------------------------------------
* Function: H5FD__onion_header_decode
*
* Purpose: Attempt to read a buffer and store it as a history-header
* structure.
*
* Implementation must correspond with
* H5FD__onion_header_encode().
*
* Return: Success: Number of bytes read from buffer
* Failure: 0
*-----------------------------------------------------------------------------
*/
size_t
H5FD__onion_header_decode(unsigned char *buf, H5FD_onion_header_t *header)
{
uint32_t ui32 = 0;
uint32_t sum = 0;
uint64_t ui64 = 0;
uint8_t *ui8p = NULL;
unsigned char *ptr = NULL;
size_t ret_value = 0;
FUNC_ENTER_PACKAGE
assert(buf != NULL);
assert(header != NULL);
assert(H5FD_ONION_HEADER_VERSION_CURR == header->version);
if (HDstrncmp((const char *)buf, H5FD_ONION_HEADER_SIGNATURE, 4))
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid header signature")
if (buf[4] != H5FD_ONION_HEADER_VERSION_CURR)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid header version")
ptr = buf + 5;
ui32 = 0;
memcpy(&ui32, ptr, 3);
ui8p = (uint8_t *)&ui32;
UINT32DECODE(ui8p, header->flags);
ptr += 3;
memcpy(&ui32, ptr, 4);
ui8p = (uint8_t *)&ui32;
UINT32DECODE(ui8p, header->page_size);
ptr += 4;
memcpy(&ui64, ptr, 8);
ui8p = (uint8_t *)&ui64;
UINT32DECODE(ui8p, header->origin_eof);
ptr += 8;
memcpy(&ui64, ptr, 8);
ui8p = (uint8_t *)&ui64;
UINT32DECODE(ui8p, header->history_addr);
ptr += 8;
memcpy(&ui64, ptr, 8);
ui8p = (uint8_t *)&ui64;
UINT32DECODE(ui8p, header->history_size);
ptr += 8;
sum = H5_checksum_fletcher32(buf, (size_t)(ptr - buf));
memcpy(&ui32, ptr, 4);
ui8p = (uint8_t *)&ui32;
UINT32DECODE(ui8p, header->checksum);
ptr += 4;
if (sum != header->checksum)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "checksum mismatch")
ret_value = (size_t)(ptr - buf);
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__onion_header_decode() */
/*-----------------------------------------------------------------------------
* Function: H5FD__onion_header_encode
*
* Purpose: Write history-header structure to the given buffer.
* All multi-byte elements are stored in little-endian word order.
*
* Implementation must correspond with
* H5FD__onion_header_decode().
*
* The destination buffer must be sufficiently large to hold the
* encoded contents (H5FD_ONION_ENCODED_SIZE_HEADER).
*
* Return: Number of bytes written to buffer.
* The checksum of the generated buffer contents (excluding the
* checksum itself) is stored in the pointer `checksum`).
*-----------------------------------------------------------------------------
*/
size_t
H5FD__onion_header_encode(H5FD_onion_header_t *header, unsigned char *buf, uint32_t *checksum /*out*/)
{
unsigned char *ptr = buf;
size_t ret_value = 0;
FUNC_ENTER_PACKAGE_NOERR
assert(buf != NULL);
assert(checksum != NULL);
assert(header != NULL);
assert(H5FD_ONION_HEADER_VERSION_CURR == header->version);
assert(0 == (header->flags & 0xFF000000)); /* max three bits long */
memcpy(ptr, H5FD_ONION_HEADER_SIGNATURE, 4);
ptr += 4;
memcpy(ptr, (unsigned char *)&header->version, 1);
ptr += 1;
UINT32ENCODE(ptr, header->flags);
ptr -= 1; /* truncate to three bytes */
UINT32ENCODE(ptr, header->page_size);
UINT64ENCODE(ptr, header->origin_eof);
UINT64ENCODE(ptr, header->history_addr);
UINT64ENCODE(ptr, header->history_size);
*checksum = H5_checksum_fletcher32(buf, (size_t)(ptr - buf));
UINT32ENCODE(ptr, *checksum);
ret_value = (size_t)(ptr - buf);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__onion_header_encode() */
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