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/*
* Copyright (c) 2026, Apollo Telephone Laboratories.
* Provided under the BSD-3 clause.
*/
#include <sys/stat.h>
#include <sys/mman.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include "bop/hash.h"
int
bop_hash_file(const char *path, char hashres[BOP_HASH_LEN])
{
int fd;
size_t len, i;
uint8_t *buf, hash[SHA256_DIGEST_LENGTH];
void *mem;
struct stat sb;
if (path == NULL) {
return -1;
}
if ((fd = open(path, O_RDONLY)) < 0) {
perror("open");
return -1;
}
if (stat(path, &sb) < 0) {
perror("stat");
close(fd);
return -1;
}
/* Grab the file length */
len = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
/* Map the file */
mem = mmap(
NULL,
len,
PROT_READ,
MAP_SHARED,
fd,
0
);
if (mem == NULL) {
perror("mmap");
close(fd);
return -1;
}
/* Allocate the buffer for packing */
buf = malloc(len + sizeof(sb.st_mtime));
if (buf == NULL) {
printf("fatal: failed to allocate hash buffer\n");
munmap(mem, len);
close(fd);
return -1;
}
/* Pack together access time and contents */
memcpy(buf, mem, len);
memcpy(&buf[len], &sb.st_mtime, sizeof(sb.st_atime));
SHA256(buf, len + sizeof(sb.st_atime), hash);
for (i = 0; i < SHA256_DIGEST_LENGTH; ++i) {
sprintf((char *)hashres + i*2, "%02X", hash[i]);
}
free(buf);
munmap(mem, len);
close(fd);
return 0;
}
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