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