79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause
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*/
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <openssl/sha.h>
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#include "blobchain/memlib.h"
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#include "blobchain/stream.h"
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int
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stream_from_file(struct data_stream *stmp, const char *path)
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{
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struct stat sb;
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void *p;
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ssize_t readlen;
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int error, fd;
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if (stmp == NULL || path == NULL) {
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errno = -EINVAL;
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return -1;
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}
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error = stat(path, &sb);
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if (error < 0) {
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perror("stat");
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return -1;
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}
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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perror("open");
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return -1;
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}
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/*
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* Now we want to allocate a whole block of memory to
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* contain the entire file.
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*
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* XXX: For this reason, it is a good idea to only work with
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* one file at a time to avoid saturating all of your RAM...
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*/
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p = xmalloc(sb.st_size);
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stmp->length = sb.st_size;
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stmp->data = p;
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readlen = read(fd, p, stmp->length);
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if (readlen < 0) {
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perror("read");
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close(fd);
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free(p);
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return -1;
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}
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SHA256(stmp->data, stmp->length, stmp->hash);
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return 0;
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}
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void
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stream_destroy(struct data_stream *stmp)
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{
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if (stmp == NULL) {
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return;
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}
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if (stmp->data == NULL) {
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return;
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}
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free(stmp->data);
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stmp->length = 0;
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stmp->data = NULL;
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}
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