lbbs/src/file_loader.c

/***************************************************************************
                                                file_loader.c  -  description
                                                         -------------------
        Copyright            : (C) 2004-2025 by Leaflet
        Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "file_loader.h"
#include "trie_dict.h"
#include "str_process.h"
#include "log.h"
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/stat.h>

#define FILE_MMAP_COUNT_LIMIT 256

static FILE_MMAP *p_file_mmap_pool = NULL;
static int file_mmap_count = 0;
static int file_mmap_free_index = -1;
static TRIE_NODE *p_trie_file_dict = NULL;

int file_loader_init(int max_file_mmap_count)
{
        if (max_file_mmap_count > FILE_MMAP_COUNT_LIMIT)
        {
                log_error("file_loader_init(%d) argument error\n", max_file_mmap_count);
                return -1;
        }

        if (p_file_mmap_pool != NULL || p_trie_file_dict != NULL)
        {
                log_error("File loader already initialized\n");
                return -1;
        }

        p_file_mmap_pool = (FILE_MMAP *)calloc((size_t)max_file_mmap_count, sizeof(FILE_MMAP));
        if (p_file_mmap_pool == NULL)
        {
                log_error("calloc(%d p_file_mmap_pool) error\n", max_file_mmap_count);
                return -2;
        }

        file_mmap_count = max_file_mmap_count;
        file_mmap_free_index = 0;

        p_trie_file_dict = trie_dict_create();
        if (p_trie_file_dict == NULL)
        {
                log_error("trie_dict_create() error\n");
                return -2;
        }

        return 0;
}

void file_loader_cleanup(void)
{
        if (p_trie_file_dict != NULL)
        {
                trie_dict_destroy(p_trie_file_dict);
                p_trie_file_dict = NULL;
        }

        if (p_file_mmap_pool != NULL)
        {
                for (int i = 0; i < file_mmap_count; i++)
                {
                        if (p_file_mmap_pool[i].p_data == NULL)
                        {
                                continue;
                        }

                        if (munmap(p_file_mmap_pool[i].p_data, p_file_mmap_pool[i].size) < 0)
                        {
                                log_error("munmap() error (%d)\n", errno);
                        }
                }
                free(p_file_mmap_pool);
                p_file_mmap_pool = NULL;
        }

        file_mmap_count = 0;
        file_mmap_free_index = -1;
}

int load_file_mmap(const char *filename)
{
        int fd;
        struct stat sb;
        void *p_data;
        size_t size;
        int file_mmap_index = 0;

        if ((fd = open(filename, O_RDONLY)) < 0)
        {
                log_error("open(%s) error (%d)\n", filename, errno);
                return -1;
        }

        if (fstat(fd, &sb) < 0)
        {
                log_error("fstat(fd) error (%d)\n", errno);
                return -1;
        }

        size = (size_t)sb.st_size;

        p_data = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0L);
        if (p_data == MAP_FAILED)
        {
                log_error("mmap() error (%d)\n", errno);
                return -2;
        }

        if (close(fd) < 0)
        {
                log_error("close(fd) error (%d)\n", errno);
                return -1;
        }

        if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) == 0) // Not exist
        {
                if (file_mmap_free_index == -1)
                {
                        log_error("file_mmap_pool is depleted\n");
                        return -3;
                }

                file_mmap_index = file_mmap_free_index;

                if (trie_dict_set(p_trie_file_dict, filename, (int64_t)file_mmap_index) != 1)
                {
                        log_error("trie_dict_set(%s) error\n", filename);

                        if (munmap(p_data, size) < 0)
                        {
                                log_error("munmap() error (%d)\n", errno);
                        }

                        return -2;
                }

                do
                {
                        file_mmap_free_index++;
                        if (file_mmap_free_index >= file_mmap_count)
                        {
                                file_mmap_free_index = 0;
                        }
                        if (file_mmap_free_index == file_mmap_index) // loop
                        {
                                file_mmap_free_index = -1;
                                break;
                        }
                } while (p_file_mmap_pool[file_mmap_free_index].p_data != NULL);
        }
        else
        {
                // Unload existing data
                if (munmap(p_file_mmap_pool[file_mmap_index].p_data, p_file_mmap_pool[file_mmap_index].size) < 0)
                {
                        log_error("munmap() error (%d)\n", errno);
                }
        }

        p_file_mmap_pool[file_mmap_index].p_data = p_data;
        p_file_mmap_pool[file_mmap_index].size = size;

        p_file_mmap_pool[file_mmap_index].line_total =
                split_data_lines(p_data, SCREEN_COLS, p_file_mmap_pool[file_mmap_index].line_offsets, MAX_FILE_LINES);

        return 0;
}

int unload_file_mmap(const char *filename)
{
        int file_mmap_index = 0;

        if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) != 1)
        {
                log_error("trie_dict_get(%s) not found\n", filename);
                return -1;
        }

        if (munmap(p_file_mmap_pool[file_mmap_index].p_data, p_file_mmap_pool[file_mmap_index].size) < 0)
        {
                log_error("munmap() error (%d)\n", errno);
        }

        p_file_mmap_pool[file_mmap_index].p_data = NULL;
        p_file_mmap_pool[file_mmap_index].size = 0L;

        if (file_mmap_free_index == -1)
        {
                file_mmap_free_index = file_mmap_index;
        }

        if (trie_dict_del(p_trie_file_dict, filename) != 1)
        {
                log_error("trie_dict_del(%s) error\n", filename);
                return -2;
        }

        return 0;
}

const FILE_MMAP *get_file_mmap(const char *filename)
{
        int file_mmap_index = file_mmap_free_index;

        if (p_file_mmap_pool == NULL || p_trie_file_dict == NULL)
        {
                log_error("File loader not initialized\n");
                return NULL;
        }

        if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) != 1) // Not exist
        {
                log_error("trie_dict_get(%s) not found\n", filename);
                return NULL;
        }

        return (&(p_file_mmap_pool[file_mmap_index]));
}
1	/***************************************************************************
2	file_loader.c - description
3	-------------------
4	Copyright : (C) 2004-2025 by Leaflet
5	Email : leaflet@leafok.com
6	***************************************************************************/
7
8	/***************************************************************************
9	* *
10	* This program is free software; you can redistribute it and/or modify *
11	* it under the terms of the GNU General Public License as published by *
12	* the Free Software Foundation; either version 3 of the License, or *
13	* (at your option) any later version. *
14	* *
15	***************************************************************************/
16
17	#include "file_loader.h"
18	#include "trie_dict.h"
19	#include "str_process.h"
20	#include "log.h"
21	#include <fcntl.h>
22	#include <errno.h>
23	#include <unistd.h>
24	#include <stdlib.h>
25	#include <sys/mman.h>
26	#include <sys/stat.h>
27
28	#define FILE_MMAP_COUNT_LIMIT 256
29
30	static FILE_MMAP *p_file_mmap_pool = NULL;
31	static int file_mmap_count = 0;
32	static int file_mmap_free_index = -1;
33	static TRIE_NODE *p_trie_file_dict = NULL;
34
35	int file_loader_init(int max_file_mmap_count)
36	{
37	if (max_file_mmap_count > FILE_MMAP_COUNT_LIMIT)
38	{
39	log_error("file_loader_init(%d) argument error\n", max_file_mmap_count);
40	return -1;
41	}
42
43	if (p_file_mmap_pool != NULL \|\| p_trie_file_dict != NULL)
44	{
45	log_error("File loader already initialized\n");
46	return -1;
47	}
48
49	p_file_mmap_pool = (FILE_MMAP *)calloc((size_t)max_file_mmap_count, sizeof(FILE_MMAP));
50	if (p_file_mmap_pool == NULL)
51	{
52	log_error("calloc(%d p_file_mmap_pool) error\n", max_file_mmap_count);
53	return -2;
54	}
55
56	file_mmap_count = max_file_mmap_count;
57	file_mmap_free_index = 0;
58
59	p_trie_file_dict = trie_dict_create();
60	if (p_trie_file_dict == NULL)
61	{
62	log_error("trie_dict_create() error\n");
63	return -2;
64	}
65
66	return 0;
67	}
68
69	void file_loader_cleanup(void)
70	{
71	if (p_trie_file_dict != NULL)
72	{
73	trie_dict_destroy(p_trie_file_dict);
74	p_trie_file_dict = NULL;
75	}
76
77	if (p_file_mmap_pool != NULL)
78	{
79	for (int i = 0; i < file_mmap_count; i++)
80	{
81	if (p_file_mmap_pool[i].p_data == NULL)
82	{
83	continue;
84	}
85
86	if (munmap(p_file_mmap_pool[i].p_data, p_file_mmap_pool[i].size) < 0)
87	{
88	log_error("munmap() error (%d)\n", errno);
89	}
90	}
91	free(p_file_mmap_pool);
92	p_file_mmap_pool = NULL;
93	}
94
95	file_mmap_count = 0;
96	file_mmap_free_index = -1;
97	}
98
99	int load_file_mmap(const char *filename)
100	{
101	int fd;
102	struct stat sb;
103	void *p_data;
104	size_t size;
105	int file_mmap_index = 0;
106
107	if ((fd = open(filename, O_RDONLY)) < 0)
108	{
109	log_error("open(%s) error (%d)\n", filename, errno);
110	return -1;
111	}
112
113	if (fstat(fd, &sb) < 0)
114	{
115	log_error("fstat(fd) error (%d)\n", errno);
116	return -1;
117	}
118
119	size = (size_t)sb.st_size;
120
121	p_data = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0L);
122	if (p_data == MAP_FAILED)
123	{
124	log_error("mmap() error (%d)\n", errno);
125	return -2;
126	}
127
128	if (close(fd) < 0)
129	{
130	log_error("close(fd) error (%d)\n", errno);
131	return -1;
132	}
133
134	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) == 0) // Not exist
135	{
136	if (file_mmap_free_index == -1)
137	{
138	log_error("file_mmap_pool is depleted\n");
139	return -3;
140	}
141
142	file_mmap_index = file_mmap_free_index;
143
144	if (trie_dict_set(p_trie_file_dict, filename, (int64_t)file_mmap_index) != 1)
145	{
146	log_error("trie_dict_set(%s) error\n", filename);
147
148	if (munmap(p_data, size) < 0)
149	{
150	log_error("munmap() error (%d)\n", errno);
151	}
152
153	return -2;
154	}
155
156	do
157	{
158	file_mmap_free_index++;
159	if (file_mmap_free_index >= file_mmap_count)
160	{
161	file_mmap_free_index = 0;
162	}
163	if (file_mmap_free_index == file_mmap_index) // loop
164	{
165	file_mmap_free_index = -1;
166	break;
167	}
168	} while (p_file_mmap_pool[file_mmap_free_index].p_data != NULL);
169	}
170	else
171	{
172	// Unload existing data
173	if (munmap(p_file_mmap_pool[file_mmap_index].p_data, p_file_mmap_pool[file_mmap_index].size) < 0)
174	{
175	log_error("munmap() error (%d)\n", errno);
176	}
177	}
178
179	p_file_mmap_pool[file_mmap_index].p_data = p_data;
180	p_file_mmap_pool[file_mmap_index].size = size;
181
182	p_file_mmap_pool[file_mmap_index].line_total =
183	split_data_lines(p_data, SCREEN_COLS, p_file_mmap_pool[file_mmap_index].line_offsets, MAX_FILE_LINES);
184
185	return 0;
186	}
187
188	int unload_file_mmap(const char *filename)
189	{
190	int file_mmap_index = 0;
191
192	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) != 1)
193	{
194	log_error("trie_dict_get(%s) not found\n", filename);
195	return -1;
196	}
197
198	if (munmap(p_file_mmap_pool[file_mmap_index].p_data, p_file_mmap_pool[file_mmap_index].size) < 0)
199	{
200	log_error("munmap() error (%d)\n", errno);
201	}
202
203	p_file_mmap_pool[file_mmap_index].p_data = NULL;
204	p_file_mmap_pool[file_mmap_index].size = 0L;
205
206	if (file_mmap_free_index == -1)
207	{
208	file_mmap_free_index = file_mmap_index;
209	}
210
211	if (trie_dict_del(p_trie_file_dict, filename) != 1)
212	{
213	log_error("trie_dict_del(%s) error\n", filename);
214	return -2;
215	}
216
217	return 0;
218	}
219
220	const FILE_MMAP get_file_mmap(const char filename)
221	{
222	int file_mmap_index = file_mmap_free_index;
223
224	if (p_file_mmap_pool == NULL \|\| p_trie_file_dict == NULL)
225	{
226	log_error("File loader not initialized\n");
227	return NULL;
228	}
229
230	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) != 1) // Not exist
231	{
232	log_error("trie_dict_get(%s) not found\n", filename);
233	return NULL;
234	}
235
236	return (&(p_file_mmap_pool[file_mmap_index]));
237	}
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