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45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
#include <sys/types.h>
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#include <unistd.h>
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#ifdef __MINGW32__
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#endif
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#include "open.h"
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#include "mmap.h"
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extern const char* mmap_read(const char* filename,size_t * filesize) {
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#ifdef __MINGW32__
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HANDLE fd,m;
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char* map;
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fd=CreateFile(filename,GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
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if (fd==INVALID_HANDLE_VALUE)
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return 0;
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m=CreateFileMapping(fd,0,PAGE_READONLY,0,0,NULL);
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map=0;
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if (m)
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if ((map=MapViewOfFile(m,FILE_MAP_READ,0,0,0)))
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*filesize=GetFileSize(fd,NULL);
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CloseHandle(m);
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CloseHandle(fd);
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return map;
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#else
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int fd=open_read(filename);
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char *map;
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if (fd>=0) {
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register off_t o=lseek(fd,0,SEEK_END);
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if (o==0 || (sizeof(off_t)!=sizeof(size_t) && o > (off_t)(size_t)-1)) { close(fd); return 0; }
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*filesize=(size_t)o;
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if (o>0) {
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map=mmap(0,*filesize,PROT_READ,MAP_SHARED,fd,0);
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if (map==(char*)-1)
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map=0;
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} else
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map="";
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close(fd);
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return map;
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}
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return 0;
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#endif
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}
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