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>

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_SHARED, 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	sysadm	1.1	/***************************************************************************
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			static FILE_MMAP *p_file_mmap_pool = NULL;
29			static int file_mmap_count = 0;
30			static int file_mmap_free_index = -1;
31			static TRIE_NODE *p_trie_file_dict = NULL;
32
33			int file_loader_init(int max_file_mmap_count)
34			{
35			if (max_file_mmap_count > FILE_MMAP_COUNT_LIMIT)
36			{
37			log_error("file_loader_init(%d) argument error\n", max_file_mmap_count);
38			return -1;
39			}
40
41			if (p_file_mmap_pool != NULL \|\| p_trie_file_dict != NULL)
42			{
43			log_error("File loader already initialized\n");
44			return -1;
45			}
46
47			p_file_mmap_pool = (FILE_MMAP *)calloc((size_t)max_file_mmap_count, sizeof(FILE_MMAP));
48			if (p_file_mmap_pool == NULL)
49			{
50			log_error("calloc(%d p_file_mmap_pool) error\n", max_file_mmap_count);
51			return -2;
52			}
53
54			file_mmap_count = max_file_mmap_count;
55			file_mmap_free_index = 0;
56
57			p_trie_file_dict = trie_dict_create();
58			if (p_trie_file_dict == NULL)
59			{
60			log_error("trie_dict_create() error\n");
61			return -2;
62			}
63
64			return 0;
65			}
66
67			void file_loader_cleanup(void)
68			{
69			if (p_trie_file_dict != NULL)
70			{
71			trie_dict_destroy(p_trie_file_dict);
72			p_trie_file_dict = NULL;
73			}
74
75			if (p_file_mmap_pool != NULL)
76			{
77			for (int i = 0; i < file_mmap_count; i++)
78			{
79			if (p_file_mmap_pool[i].p_data == NULL)
80			{
81			continue;
82			}
83
84			if (munmap(p_file_mmap_pool[i].p_data, p_file_mmap_pool[i].size) < 0)
85			{
86			log_error("munmap() error (%d)\n", errno);
87			}
88			}
89			free(p_file_mmap_pool);
90			p_file_mmap_pool = NULL;
91			}
92
93			file_mmap_count = 0;
94			file_mmap_free_index = -1;
95			}
96
97			int load_file_mmap(const char *filename)
98			{
99			int fd;
100			struct stat sb;
101			void *p_data;
102			size_t size;
103			int file_mmap_index = 0;
104
105			if ((fd = open(filename, O_RDONLY)) < 0)
106			{
107			log_error("open(%s) error (%d)\n", filename, errno);
108			return -1;
109			}
110
111			if (fstat(fd, &sb) < 0)
112			{
113			log_error("fstat(fd) error (%d)\n", errno);
114			return -1;
115			}
116
117			size = (size_t)sb.st_size;
118
119	sysadm	1.2	p_data = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0L);
120	sysadm	1.1	if (p_data == MAP_FAILED)
121			{
122			log_error("mmap() error (%d)\n", errno);
123			return -2;
124			}
125
126			if (close(fd) < 0)
127			{
128			log_error("close(fd) error (%d)\n", errno);
129			return -1;
130			}
131
132			if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) == 0) // Not exist
133			{
134			if (file_mmap_free_index == -1)
135			{
136			log_error("file_mmap_pool is depleted\n");
137			return -3;
138			}
139
140			file_mmap_index = file_mmap_free_index;
141
142			if (trie_dict_set(p_trie_file_dict, filename, (int64_t)file_mmap_index) != 1)
143			{
144			log_error("trie_dict_set(%s) error\n", filename);
145
146			if (munmap(p_data, size) < 0)
147			{
148			log_error("munmap() error (%d)\n", errno);
149			}
150
151			return -2;
152			}
153
154			do
155			{
156			file_mmap_free_index++;
157			if (file_mmap_free_index >= file_mmap_count)
158			{
159			file_mmap_free_index = 0;
160			}
161			if (file_mmap_free_index == file_mmap_index) // loop
162			{
163			file_mmap_free_index = -1;
164			break;
165			}
166			} while (p_file_mmap_pool[file_mmap_free_index].p_data != NULL);
167			}
168			else
169			{
170			// Unload existing data
171			if (munmap(p_file_mmap_pool[file_mmap_index].p_data, p_file_mmap_pool[file_mmap_index].size) < 0)
172			{
173			log_error("munmap() error (%d)\n", errno);
174			}
175			}
176
177			p_file_mmap_pool[file_mmap_index].p_data = p_data;
178			p_file_mmap_pool[file_mmap_index].size = size;
179
180			p_file_mmap_pool[file_mmap_index].line_total =
181			split_data_lines(p_data, SCREEN_COLS, p_file_mmap_pool[file_mmap_index].line_offsets, MAX_FILE_LINES);
182
183			return 0;
184			}
185
186			int unload_file_mmap(const char *filename)
187			{
188			int file_mmap_index = 0;
189
190			if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) != 1)
191			{
192			log_error("trie_dict_get(%s) not found\n", filename);
193			return -1;
194			}
195
196			if (munmap(p_file_mmap_pool[file_mmap_index].p_data, p_file_mmap_pool[file_mmap_index].size) < 0)
197			{
198			log_error("munmap() error (%d)\n", errno);
199			}
200
201			p_file_mmap_pool[file_mmap_index].p_data = NULL;
202			p_file_mmap_pool[file_mmap_index].size = 0L;
203
204			if (file_mmap_free_index == -1)
205			{
206			file_mmap_free_index = file_mmap_index;
207			}
208
209			if (trie_dict_del(p_trie_file_dict, filename) != 1)
210			{
211			log_error("trie_dict_del(%s) error\n", filename);
212			return -2;
213			}
214
215			return 0;
216			}
217
218			const FILE_MMAP get_file_mmap(const char filename)
219			{
220			int file_mmap_index = file_mmap_free_index;
221
222			if (p_file_mmap_pool == NULL \|\| p_trie_file_dict == NULL)
223			{
224			log_error("File loader not initialized\n");
225			return NULL;
226			}
227
228			if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&file_mmap_index) != 1) // Not exist
229			{
230			log_error("trie_dict_get(%s) not found\n", filename);
231			return NULL;
232			}
233
234			return (&(p_file_mmap_pool[file_mmap_index]));
235			}
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