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#ifndef FILEOBJECT_H
#define FILEOBJECT_H
/*
IOFileObjects are used as part of the IO.Handle
implementation, ensuring that when handles are
finalised, buffers are flushed and FILE* objects
are closed (we really should be using file descriptors
here..)
*/
typedef struct _IOFileObject {
int fd;
void* buf;
int bufWPtr; /* points to next position to write,
bufRPtr >= bufWPtr <= bufSize.
For read-only files, bufWPtr = bufSize
bufWPtr = 0 => buffer is empty.
*/
int bufRPtr; /* points to the next char to read
-1 >= bufRPtr <= bufWPtr
For write-only files, bufRPtr = 0
bufRPtr == -1 => buffer is empty.
*/
int bufSize;
int flags;
struct _IOFileObject* connectedTo;
} IOFileObject;
#define FILEOBJ_LB 2
#define FILEOBJ_BB 4
#define FILEOBJ_EOF 8
#define FILEOBJ_READ 16
#define FILEOBJ_WRITE 32
#define FILEOBJ_STD 64
/* The next two flags are used for RW file objects only.
They indicate whether the last operation was a read or a write.
(Need this info to determine whether a RW file object's
buffer should be flushed before doing a subsequent
read or write).
*/
#define FILEOBJ_RW_READ 256
#define FILEOBJ_RW_WRITE 512
/*
* Under Win32, a file fd is not the same as a socket fd, so
* we need to use separate r/w calls.
*/
#define FILEOBJ_WINSOCK 1024
#define FILEOBJ_BINARY 2048
#define FILEOBJ_IS_EOF(x) ((x)->flags & FILEOBJ_EOF)
#define FILEOBJ_SET_EOF(x) ((x)->flags |= FILEOBJ_EOF)
#define FILEOBJ_CLEAR_EOF(x) ((x)->flags &= ~FILEOBJ_EOF)
#define FILEOBJ_CLEAR_ERR(x) FILEOBJ_CLEAR_EOF(x)
#define FILEOBJ_BLOCKED_READ -5
#define FILEOBJ_BLOCKED_WRITE -6
#define FILEOBJ_BLOCKED_CONN_WRITE -7
#define FILEOBJ_UNBUFFERED(x) (!((x)->flags & FILEOBJ_LB) && !((x)->flags & FILEOBJ_BB))
#define FILEOBJ_LINEBUFFERED(x) ((x)->flags & FILEOBJ_LB)
#define FILEOBJ_BLOCKBUFFERED(x) ((x)->flags & FILEOBJ_BB)
#define FILEOBJ_BUFFER_FULL(x) ((x)->bufWPtr >= (x)->bufSize)
#define FILEOBJ_BUFFER_EMPTY(x) ((x)->bufRPtr == (x)->bufWPtr)
#define FILEOBJ_HAS_PUSHBACKS(x) ((x)->buf != NULL && (x)->bufRPtr >= 0 && (x)->bufRPtr < (x)->bufWPtr)
#define FILEOBJ_READABLE(x) ((x)->flags & FILEOBJ_READ)
#define FILEOBJ_WRITEABLE(x) ((x)->flags & FILEOBJ_WRITE)
#define FILEOBJ_JUST_READ(x) ((x)->flags & FILEOBJ_RW_READ)
#define FILEOBJ_JUST_WRITTEN(x) ((x)->flags & FILEOBJ_RW_WRITE)
#define FILEOBJ_NEEDS_FLUSHING(x) (!FILEOBJ_BUFFER_EMPTY(x))
#define FILEOBJ_RW(x) (FILEOBJ_READABLE(x) && FILEOBJ_WRITEABLE(x))
#endif /* FILEOBJECT_H */
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