csum-file.c: use unsafe_hash_algo()

Instead of calling the unsafe_ hash function variants directly, make use
of the shared 'algop' pointer by initializing it to:

    f->algop = unsafe_hash_algo(the_hash_algo);

, thus making all calls use the unsafe variants directly.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: ttaylorr

csum-file.c

@@ -50,7 +50,7 @@ void hashflush(struct hashfile *f)
 
 	if (offset) {
 		if (!f->skip_hash)
-			f->algop->unsafe_update_fn(&f->ctx, f->buffer, offset);
+			f->algop->update_fn(&f->ctx, f->buffer, offset);
 		flush(f, f->buffer, offset);
 		f->offset = 0;
 	}
@@ -73,7 +73,7 @@ int finalize_hashfile(struct hashfile *f, unsigned char *result,
 	if (f->skip_hash)
 		hashclr(f->buffer, f->algop);
 	else
-		f->algop->unsafe_final_fn(f->buffer, &f->ctx);
+		f->algop->final_fn(f->buffer, &f->ctx);
 
 	if (result)
 		hashcpy(result, f->buffer, f->algop);
@@ -128,7 +128,7 @@ void hashwrite(struct hashfile *f, const void *buf, unsigned int count)
 			 * f->offset is necessarily zero.
 			 */
 			if (!f->skip_hash)
-				f->algop->unsafe_update_fn(&f->ctx, buf, nr);
+				f->algop->update_fn(&f->ctx, buf, nr);
 			flush(f, buf, nr);
 		} else {
 			/*
@@ -175,8 +175,8 @@ static struct hashfile *hashfd_internal(int fd, const char *name,
 	f->do_crc = 0;
 	f->skip_hash = 0;
 
-	f->algop = the_hash_algo;
-	f->algop->unsafe_init_fn(&f->ctx);
+	f->algop = unsafe_hash_algo(the_hash_algo);
+	f->algop->init_fn(&f->ctx);
 
 	f->buffer_len = buffer_len;
 	f->buffer = xmalloc(buffer_len);
@@ -210,7 +210,7 @@ void hashfile_checkpoint(struct hashfile *f, struct hashfile_checkpoint *checkpo
 {
 	hashflush(f);
 	checkpoint->offset = f->total;
-	f->algop->unsafe_clone_fn(&checkpoint->ctx, &f->ctx);
+	f->algop->clone_fn(&checkpoint->ctx, &f->ctx);
 }
 
 int hashfile_truncate(struct hashfile *f, struct hashfile_checkpoint *checkpoint)
@@ -221,7 +221,7 @@ int hashfile_truncate(struct hashfile *f, struct hashfile_checkpoint *checkpoint
 	    lseek(f->fd, offset, SEEK_SET) != offset)
 		return -1;
 	f->total = offset;
-	f->algop->unsafe_clone_fn(&f->ctx, &checkpoint->ctx);
+	f->algop->clone_fn(&f->ctx, &checkpoint->ctx);
 	f->offset = 0; /* hashflush() was called in checkpoint */
 	return 0;
 }
@@ -242,15 +242,15 @@ int hashfile_checksum_valid(const unsigned char *data, size_t total_len)
 {
 	unsigned char got[GIT_MAX_RAWSZ];
 	git_hash_ctx ctx;
-	const struct git_hash_algo *algop = the_hash_algo;
+	const struct git_hash_algo *algop = unsafe_hash_algo(the_hash_algo);
 	size_t data_len = total_len - algop->rawsz;
 
 	if (total_len < algop->rawsz)
 		return 0; /* say "too short"? */
 
-	algop->unsafe_init_fn(&ctx);
-	algop->unsafe_update_fn(&ctx, data, data_len);
-	algop->unsafe_final_fn(got, &ctx);
+	algop->init_fn(&ctx);
+	algop->update_fn(&ctx, data, data_len);
+	algop->final_fn(got, &ctx);
 
 	return hasheq(got, data + data_len, algop);
 }