static int
calculate_chunk_sha1(struct filedes *in_fd, size_t this_chunk_size,
off_t offset, u8 sha1_md[])
{
u8 buf[BUFFER_SIZE];
SHA_CTX ctx;
size_t bytes_remaining;
size_t bytes_to_read;
int ret;
bytes_remaining = this_chunk_size;
sha1_init(&ctx);
do {
bytes_to_read = min(bytes_remaining, sizeof(buf));
ret = full_pread(in_fd, buf, bytes_to_read, offset);
if (ret) {
ERROR_WITH_ERRNO("Read error while calculating "
"integrity checksums");
return ret;
}
sha1_update(&ctx, buf, bytes_to_read);
bytes_remaining -= bytes_to_read;
offset += bytes_to_read;
} while (bytes_remaining);
sha1_final(sha1_md, &ctx);
return 0;
}
int do_pread(long fd, char *buffer, int length, int offset)
{
if(do_chirp) {
return chirp_reli_pread((struct chirp_file *) fd, buffer, length, offset, stoptime);
} else {
return full_pread(fd, buffer, length, offset);
}
}
