forked from MarcoBuster/Magisk
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#include <unistd.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include "utils.h"
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void mmap_ro(const char *filename, void **buf, size_t *size) {
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int fd = xopen(filename, O_RDONLY);
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*size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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*buf = xmmap(NULL, *size, PROT_READ, MAP_SHARED, fd, 0);
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close(fd);
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}
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void mmap_rw(const char *filename, void **buf, size_t *size) {
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int fd = xopen(filename, O_RDWR);
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*size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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*buf = xmmap(NULL, *size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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close(fd);
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}
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void write_zero(int fd, size_t size) {
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size_t pos = lseek(fd, 0, SEEK_CUR);
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ftruncate(fd, pos + size);
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lseek(fd, pos + size, SEEK_SET);
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}
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void mem_align(size_t *pos, size_t align) {
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size_t mask = align - 1;
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if (*pos & mask) {
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*pos += align - (*pos & mask);
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}
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}
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void file_align(int fd, size_t align, int out) {
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size_t pos = lseek(fd, 0, SEEK_CUR);
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size_t mask = align - 1;
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size_t off;
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if (pos & mask) {
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off = align - (pos & mask);
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if (out) {
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write_zero(fd, off);
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} else {
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lseek(fd, pos + off, SEEK_SET);
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}
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}
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}
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int open_new(const char *filename) {
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return xopen(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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}
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