harfbuzz/util/hb-subset.cc

83 lines
2.0 KiB
C++

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "hb-private.hh"
#include "hb-blob.h"
int
main (int argc, char **argv)
{
int exit_code = 0;
if (argc != 4) {
fprintf(stderr, "Must have 4 args\n");
exit(1);
}
int fd = open(argv[1], O_RDONLY);
if (fd == -1) {
perror("Unable to open font file");
exit(1);
}
void *mapped_file = MAP_FAILED;
int fd_out = -1;
struct stat stat;
if (fstat(fd, &stat) != -1) {
mapped_file = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (mapped_file == MAP_FAILED) {
perror("Failed to map file");
}
} else {
perror("Unable to fstat");
}
if (mapped_file != MAP_FAILED) {
hb_blob_t *font_blob = hb_blob_create(static_cast<const char*>(mapped_file),
stat.st_size,
HB_MEMORY_MODE_READONLY, nullptr,
nullptr);
fd_out = open(argv[2], O_CREAT | O_WRONLY, S_IRWXU);
if (fd_out != -1) {
ssize_t bytes_written = write(fd_out, mapped_file, stat.st_size);
if (bytes_written == -1) {
perror("Unable to write output file");
exit_code = 1;
} else if (bytes_written != stat.st_size) {
fprintf(stderr, "Wrong number of bytes written");
exit_code = 1;
}
} else {
perror("Unable to open output file");
exit_code = 1;
}
}
if (mapped_file != MAP_FAILED) {
if (munmap(mapped_file, stat.st_size) == -1) {
perror("Unable to unmap file");
exit_code = 1;
}
}
if (fd_out != -1 && close(fd_out) == -1) {
perror("Unable to close output file");
exit_code = 1;
}
if (fd != -1 && close(fd) == -1) {
perror("Unable to close file");
exit_code = 1;
}
return exit_code;
}