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64 lines
2.7 KiB
C
64 lines
2.7 KiB
C
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/*====================================================================*
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- Copyright (C) 2001 Leptonica. All rights reserved.
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- This software is distributed in the hope that it will be
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- useful, but with NO WARRANTY OF ANY KIND.
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- No author or distributor accepts responsibility to anyone for the
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- consequences of using this software, or for whether it serves any
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- particular purpose or works at all, unless he or she says so in
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- writing. Everyone is granted permission to copy, modify and
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- redistribute this source code, for commercial or non-commercial
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- purposes, with the following restrictions: (1) the origin of this
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- source code must not be misrepresented; (2) modified versions must
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- be plainly marked as such; and (3) this notice may not be removed
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- or altered from any source or modified source distribution.
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*====================================================================*/
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#ifndef LEPTONICA_QUEUE_H
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#define LEPTONICA_QUEUE_H
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/*
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* queue.h
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*
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* Expandable pointer queue for arbitrary void* data.
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*
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* The L_Queue is a fifo that implements a queue of void* pointers.
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* It can be used to hold a queue of any type of struct.
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*
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* Internally, it maintains two counters:
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* nhead: location of head (in ptrs) from the beginning
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* of the array.
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* nelem: number of ptr elements stored in the queue.
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*
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* The element at the head of the queue, which is the next to
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* be removed, is array[nhead]. The location at the tail of the
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* queue to which the next element will be added is
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* array[nhead + nelem].
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*
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* As items are added to the queue, nelem increases.
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* As items are removed, nhead increases and nelem decreases.
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* Any time the tail reaches the end of the allocated array,
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* all the pointers are shifted to the left, so that the head
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* is at the beginning of the array.
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* If the array becomes more than 3/4 full, it doubles in size.
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*
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* The auxiliary stack can be used in a wrapper for re-using
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* items popped from the queue. It is not made by default.
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*
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* For further implementation details, see queue.c.
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*/
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struct L_Queue
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{
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l_int32 nalloc; /* size of allocated ptr array */
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l_int32 nhead; /* location of head (in ptrs) from the */
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/* beginning of the array */
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l_int32 nelem; /* number of elements stored in the queue */
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void **array; /* ptr array */
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struct L_Stack *stack; /* auxiliary stack */
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};
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typedef struct L_Queue L_QUEUE;
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#endif /* LEPTONICA_QUEUE_H */
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