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annotate mupdf-source/thirdparty/leptonica/src/queue.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /*====================================================================*
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2 - Copyright (C) 2001 Leptonica. All rights reserved.
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3 -
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4 - Redistribution and use in source and binary forms, with or without
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5 - modification, are permitted provided that the following conditions
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6 - are met:
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7 - 1. Redistributions of source code must retain the above copyright
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8 - notice, this list of conditions and the following disclaimer.
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9 - 2. Redistributions in binary form must reproduce the above
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10 - copyright notice, this list of conditions and the following
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11 - disclaimer in the documentation and/or other materials
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12 - provided with the distribution.
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13 -
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14 - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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15 - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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16 - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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17 - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
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18 - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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19 - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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20 - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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21 - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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22 - OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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23 - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *====================================================================*/
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26
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27 #ifndef LEPTONICA_QUEUE_H
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28 #define LEPTONICA_QUEUE_H
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30 /*!
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31 * \file queue.h
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32 *
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33 * <pre>
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34 * Expandable pointer queue for arbitrary void* data.
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35 *
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36 * The L_Queue is a fifo that implements a queue of void* pointers.
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37 * It can be used to hold a queue of any type of struct.
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38 *
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39 * Internally, it maintains two counters:
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40 * nhead: location of head (in ptrs) from the beginning
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41 * of the array.
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42 * nelem: number of ptr elements stored in the queue.
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43 *
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44 * The element at the head of the queue, which is the next to
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45 * be removed, is array[nhead]. The location at the tail of the
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46 * queue to which the next element will be added is
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47 * array[nhead + nelem].
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48 *
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49 * As items are added to the queue, nelem increases.
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50 * As items are removed, nhead increases and nelem decreases.
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51 * Any time the tail reaches the end of the allocated array,
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52 * all the pointers are shifted to the left, so that the head
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53 * is at the beginning of the array.
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54 * If the array becomes more than 3/4 full, it doubles in size.
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55 *
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56 * The auxiliary stack can be used in a wrapper for re-using
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57 * items popped from the queue. It is not made by default.
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58 *
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59 * For further implementation details, see queue.c.
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60 * </pre>
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61 */
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62
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63 /*! Expandable pointer queue for arbitrary void* data */
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64 struct L_Queue
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65 {
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66 l_int32 nalloc; /*!< size of allocated ptr array */
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67 l_int32 nhead; /*!< location of head (in ptrs) from the */
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68 /*!< beginning of the array */
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69 l_int32 nelem; /*!< number of elements stored in the queue */
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70 void **array; /*!< ptr array */
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71 struct L_Stack *stack; /*!< auxiliary stack */
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72
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73 };
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74 typedef struct L_Queue L_QUEUE;
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75
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76
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77 #endif /* LEPTONICA_QUEUE_H */