65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/******************************************************************************
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* MiniFFS : Mini Flat File System
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* file.c: This is the file based implementation of the MiniFFS
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*
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* Copyright (c) 2008-2022 986-Studio. All rights reserved.
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*
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******************************************************************************/
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#ifdef _WIN32
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#include <stdio.h>
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#include <stdlib.h>
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#else
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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#endif
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#define __miniffs_internal
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#include <miniffs.h>
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size_t host_map_file(char *filename, char **dest)
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{
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char *ret_ptr;
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size_t fileSize;
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#ifdef _WIN32
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/* As windows do not provide an easy to use mmap equivalent, let's use the fallback
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* of opening the file, allocating memory and read the file in the said memory
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*/
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FILE *fp;
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fp = fopen(filename, "rb");
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fseek(fp, 0, SEEK_END);
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fileSize = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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ret_ptr = (char *)calloc(1, fileSize);
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fread(ret_ptr, 1, fileSize, fp);
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fclose(fp);
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#else
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int fd;
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struct stat FileStat;
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fd = open(filename, O_RDWR);
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fstat(fd, &FileStat);
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ret_ptr = (char *)mmap(NULL, FileStat.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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close(fd);
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fileSize = FileStat.st_size
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if (ret_ptr == MAP_FAILED)
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{
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ret_ptr = NULL;
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}
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#endif
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*dest = ret_ptr;
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return fileSize;
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}
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void host_unmap_file(char **dest, size_t length)
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{
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#ifdef _WIN32
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/* As for windows we don't mmap, let's just free! */
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free(*dest);
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#else
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munmap(*dest, length);
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#endif
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*dest = NULL;
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} |