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54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2002-2004 Niels Elburg <nelburg@looze.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License , or (at your option) any later version.
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*
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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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*
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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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*/
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#ifndef VJ_MMAP_H
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#define VJ_MMAP_H
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <stdint.h>
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typedef struct
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{
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void *map_start; /* result of mmap() */
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void *data_start; /* start of data */
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uint64_t start_region;
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uint64_t end_region;
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off_t mem_offset; /* start of image */
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int fd; /* file descriptor */
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size_t page_size; /* page size */
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size_t map_length; /* requested map size */
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long eof; /* file size */
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} mmap_region_t;
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// map file portion to memory, return mapped region
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mmap_region_t * mmap_file(int fd, int offset, int length, int fs);
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// see if requested boundaries is mapped in memory
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int is_mapped( mmap_region_t *map, int offset, int size );
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// remap a portion of a file in memory
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int remap_file( mmap_region_t *map, int offset );
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// unmap memory
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int munmap_file( mmap_region_t *map );
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void mmap_free(mmap_region_t *map );
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int mmap_read( mmap_region_t *map, int offset, int bytes, uint8_t *buf);
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#endif
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