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#ifndef __VIRTFILE_H__
#define __VIRTFILE_H__
/*
* Jeffrey Friedl
* Omron Corporation ʳ
* Nagaokakyoshi, Japan 617Ĺ
*
* jfriedl@nff.ncl.omron.co.jp
*
* This work is placed under the terms of the GNU General Purpose License
* (the "GNU Copyleft").
*
* July 1996
*
* Routine to access a file with virtualmemory-like access.
*/
typedef long int fileloc; /* index to a file position */
/*
* Information on a single virtual file.
*/
typedef struct
{
int fd; /* open file descriptor */
const char *filename; /* for reference, filename of opened file */
fileloc length; /* length of opened file */
} VirtFile;
/*
* Pages used for access to all files.
*/
typedef struct
{
VirtFile *owner; /* this page represents part of this file */
const unsigned char *text; /* pointer to this page's text */
fileloc start; /* offset into file this page starts */
fileloc end; /* offset into file this page ends */
} Page;
/*
* Open the file and return it's virtual handle.
*/
VirtFile *
OpenVertFile(const char *filename);
/*
* Given a firtual file and an offset into the file, return a pointer
* to the string which starts (or encompasses) the starting position.
* If pCount is not NULL, is filled with the length of the line.
*/
const unsigned char *
VirtPos2Str(VirtFile *v, fileloc start, unsigned *pCount);
/* convenient utility */
extern long int filesize(const char *filename);
#endif /* File Wrapper */
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