kopia lustrzana https://github.com/xdsopl/robot36
108 wiersze
2.0 KiB
C
108 wiersze
2.0 KiB
C
/*
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robot36 - encode and decode images using SSTV in Robot 36 mode
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Written in 2011 by <Ahmet Inan> <xdsopl@googlemail.com>
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To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide. This software is distributed without any warranty.
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You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#include <stdio.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include "mmap_file.h"
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int mmap_file_ro(void **p, char *name, size_t *size)
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{
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*size = 0;
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int fd = open(name, O_RDONLY);
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if (fd == -1) {
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perror("open");
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return 0;
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}
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struct stat sb;
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if (fstat(fd, &sb) == -1) {
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perror("fstat");
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close(fd);
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return 0;
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}
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if (!S_ISREG(sb.st_mode)) {
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fprintf(stderr, "%s not a file\n", name);
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close(fd);
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return 0;
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}
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*p = mmap(0, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
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if (*p == MAP_FAILED) {
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perror("mmap");
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close(fd);
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return 0;
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}
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if (close(fd) == -1) {
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perror ("close");
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return 0;
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}
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*size = sb.st_size;
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return 1;
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}
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int mmap_file_rw(void **p, char *name, size_t size)
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{
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int fd = open(name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
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if (fd == -1) {
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perror("open");
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return 0;
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}
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struct stat sb;
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if (fstat(fd, &sb) == -1) {
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perror("fstat");
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close(fd);
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return 0;
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}
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if (!S_ISREG(sb.st_mode)) {
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fprintf(stderr, "%s not a file\n", name);
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close(fd);
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return 0;
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}
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if (lseek(fd, size - 1, SEEK_SET) == -1) {
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perror("lseek");
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close(fd);
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return 0;
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}
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if (write(fd, "", 1) != 1) {
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perror("write");
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close(fd);
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return 0;
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}
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*p = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (*p == MAP_FAILED) {
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perror("mmap");
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close(fd);
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return 0;
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}
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if (close(fd) == -1) {
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perror ("close");
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return 0;
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}
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return 1;
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}
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int munmap_file(void *p, size_t size)
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{
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if (munmap(p, size) == -1) {
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perror("munmap");
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return 0;
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}
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return 1;
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}
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