196 lines
2.7 KiB
C++
196 lines
2.7 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined(__linux__)
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#endif
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#include "Arena.h"
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#define ARENA_UNINIT 0
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#define ARENA_STATIC 1
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#define ARENA_ALLOC 2
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#define ARENA_MMAP 3
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#define PROT_RW PROT_READ|PROT_WRITE
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int
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new_arena(Arena &arena, uint8_t *mem, size_t size)
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{
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arena.store = mem;
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arena.size = size;
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arena.type = ARENA_STATIC;
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return 0;
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}
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int
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alloc_new_arena(Arena &arena, size_t size)
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{
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if (arena.size > 0) {
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if (arena_destroy(arena) != 0) {
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return -1;
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}
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}
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arena.type = ARENA_ALLOC;
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arena.size = size;
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arena.store = (uint8_t *)calloc(sizeof(uint8_t), size);
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if (arena.store == NULL) {
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return -1;
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}
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return 0;
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}
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#if defined(__linux__)
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int
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mmap_arena(Arena &arena, int fd, size_t size)
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{
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if (arena.size > 0) {
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if (arena_destroy(arena) != 0) {
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return -1;
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}
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}
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arena.type = ARENA_MMAP;
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arena.size = size;
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arena.store = (uint8_t *)mmap(NULL, size, PROT_RW, MAP_SHARED, fd, 0);
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if ((void *)arena.store == MAP_FAILED) {
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return -1;
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}
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arena.fd = fd;
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return 0;
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}
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int
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open_arena(Arena &arena, const char *path)
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{
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struct stat st;
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if (arena.size > 0) {
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if (arena_destroy(arena) != 0) {
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return -1;
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}
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}
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if (stat(path, &st) != 0) {
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return -1;
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}
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arena.fd = open(path, O_RDWR);
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if (arena.fd == -1) {
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return -1;
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}
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return mmap_arena(arena, arena.fd, (size_t)st.st_size);
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}
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int
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create_arena(Arena &arena, const char *path, size_t size, mode_t mode)
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{
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int fd = 0;
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if (arena.size > 0) {
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if (arena_destroy(arena) != 0) {
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return -1;
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}
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}
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fd = open(path, O_WRONLY|O_CREAT, mode);
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if (fd == -1) {
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return -1;
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}
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if (ftruncate(fd, size) == -1) {
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return -1;
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}
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close(fd);
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return open_arena(arena, path);
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}
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#endif
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void
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arena_clear(Arena &arena)
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{
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if (arena.size == 0) {
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return;
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}
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memset(arena.store, 0, arena.size);
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}
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int
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arena_destroy(Arena &arena)
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{
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if (arena.type == ARENA_UNINIT) {
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return 0;
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}
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switch (arena.type) {
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case ARENA_STATIC:
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break;
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case ARENA_ALLOC:
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free(arena.store);
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break;
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case ARENA_MMAP:
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if (munmap(arena.store, arena.size) == -1) {
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return -1;
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}
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if (close(arena.fd) == -1) {
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return -1;
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}
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arena.fd = 0;
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break;
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default:
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abort();
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return -1;
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}
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arena.type = ARENA_UNINIT;
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arena.size = 0;
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arena.store = NULL;
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return 0;
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}
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int
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write_arena(Arena &arena, const char *path)
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{
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FILE *arenaFile = NULL;
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int retc = -1;
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arenaFile = fopen(path, "w");
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if (arenaFile == NULL) {
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return -1;
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}
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if (fwrite(arena.store, sizeof(*arena.store), arena.size,
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arenaFile) == arena.size) {
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retc = 0;
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}
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if (fclose(arenaFile) != 0) {
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return -1;
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}
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return retc;
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}
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