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/* Copyright (C) 2021 Free Software Foundation, Inc.
Contributed by Oracle.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#ifndef _DATA_WINDOW_H
#define _DATA_WINDOW_H
// The Data_window class hiearchy is used to access raw data in the
// experiment record.
//
// The Data_window base class implements a set of windows into a raw data file.
// It is responsible for mapping and unmapping regions of the file as
// requested by other levels inside of the DBE.
#include "util.h"
class Data_window
{
public:
// Span in data file
typedef struct
{
int64_t offset; // file offset
int64_t length; // span length
} Span;
Data_window (char *filename);
~Data_window ();
// Return address of "offset" byte of window for "length" bytes.
// Return 0 on error or locked.
void *bind (Span *span, int64_t minSize);
void *bind (int64_t file_offset, int64_t minSize);
void *get_data (int64_t offset, int64_t size, void *datap);
int64_t get_buf_size ();
int64_t copy_to_file (int f, int64_t offset, int64_t size);
bool not_opened () { return !opened; }
off64_t get_fsize () { return fsize; }
template <typename Key_t> inline Key_t
get_align_val (Key_t *vp)
{
if (sizeof (Key_t) <= sizeof (int))
return *vp;
// 64-bit value can have a wrong alignment
Key_t val = (Key_t) 0;
uint32_t *p1 = (uint32_t *) vp;
uint32_t *p2 = (uint32_t*) (&val);
p2[0] = p1[0];
p2[1] = p1[1];
return val;
}
template <typename Key_t> inline Key_t
decode (Key_t &v)
{
Key_t val = get_align_val (&v);
if (need_swap_endian)
swapByteOrder (&val, sizeof (val));
return val;
}
bool need_swap_endian;
char *fname; // file name
protected:
int fd; // file descriptor
bool mmap_on_file;
private:
long page_size; // used in mmap()
bool use_mmap;
bool opened;
int64_t fsize; // file size
void *base; // current window
int64_t woffset; // offset of current window
int64_t wsize; // size of current window
int64_t basesize; // size of allocated window
};
#endif /* _DATA_WINDOW_H */
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