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#include "../../include/mgl/system/fileutils.h"
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
int mgl_load_file(const char *filepath, mgl_filedata *filedata, mgl_file_load_options *load_options) {
const bool null_terminated = load_options ? load_options->null_terminated : false;
int fd = open(filepath, O_RDONLY);
if(fd == -1)
return -1;
struct stat st;
if(fstat(fd, &st) == -1) {
close(fd);
return -1;
}
if(!S_ISREG(st.st_mode)) {
close(fd);
return -1;
}
unsigned char *data = malloc(st.st_size + (null_terminated ? 1 : 0));
if(!data) {
close(fd);
return -1;
}
if(read(fd, data, st.st_size) != st.st_size) {
free(data);
close(fd);
return -1;
}
if(null_terminated)
data[st.st_size] = '\0';
filedata->data = data;
filedata->size = st.st_size;
close(fd);
return 0;
}
void mgl_filedata_free(mgl_filedata *self) {
free(self->data);
self->data = NULL;
self->size = 0;
}
static int load_options_to_open_flag(mgl_memory_mapped_file_load_options *load_options) {
const bool readable = load_options ? load_options->readable : true;
const bool writable = load_options ? load_options->writable : true;
int open_flag = 0;
if(readable && writable)
open_flag = O_RDWR;
else if(readable)
open_flag = O_RDONLY;
else if(writable)
open_flag = O_WRONLY;
return open_flag;
}
static int load_options_to_mmap_prot_flag(mgl_memory_mapped_file_load_options *load_options) {
const bool readable = load_options ? load_options->readable : true;
const bool writable = load_options ? load_options->writable : true;
int prot_flag = 0;
if(readable)
prot_flag |= PROT_READ;
if(writable)
prot_flag |= PROT_WRITE;
return prot_flag;
}
int mgl_mapped_file_load(const char *filepath, mgl_memory_mapped_file *memory_mapped_file, mgl_memory_mapped_file_load_options *load_options) {
memory_mapped_file->data = NULL;
memory_mapped_file->size = 0;
memory_mapped_file->fd = -1;
int fd = open(filepath, load_options_to_open_flag(load_options));
if(fd == -1)
return -1;
struct stat st;
if(fstat(fd, &st) == -1) {
close(fd);
return -1;
}
void *mapped = mmap(0, st.st_size, load_options_to_mmap_prot_flag(load_options), MAP_SHARED, fd, 0);
if(mapped == MAP_FAILED) {
close(fd);
return -1;
}
memory_mapped_file->data = mapped;
memory_mapped_file->size = st.st_size;
memory_mapped_file->fd = fd;
return 0;
}
void mgl_mapped_file_unload(mgl_memory_mapped_file *memory_mapped_file) {
if(memory_mapped_file->data != MAP_FAILED && memory_mapped_file->data != NULL) {
munmap(memory_mapped_file->data, memory_mapped_file->size);
memory_mapped_file->data = NULL;
}
memory_mapped_file->size = 0;
if(memory_mapped_file->fd != -1) {
close(memory_mapped_file->fd);
memory_mapped_file->fd = -1;
}
}
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