1 files changed, 77 insertions, 0 deletions
diff --git a/src/status.c b/src/status.c
new file mode 100644
index 000000000..694ed921f
--- /dev/null
+++ b/src/status.c
@@ -0,0 +1,77 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2,
+ * as published by the Free Software Foundation.
+ *
+ * In addition to the permissions in the GNU General Public License,
+ * the authors give you unlimited permission to link the compiled
+ * version of this file into combinations with other programs,
+ * and to distribute those combinations without any restriction
+ * coming from the use of this file.  (The General Public License
+ * restrictions do apply in other respects; for example, they cover
+ * modification of the file, and distribution when not linked into
+ * a combined executable.)
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "common.h"
+#include "git2.h"
+#include "fileops.h"
+#include "hash.h"
+
+int git_status_hashfile(git_oid *out, const char *path)
+{
+	int fd, len;
+	char hdr[64], buffer[2048];
+	git_off_t size;
+	git_hash_ctx *ctx;
+
+	if ((fd = p_open(path, O_RDONLY)) < 0)
+		return git__throw(GIT_ENOTFOUND, "Could not open '%s'", path);
+
+	if ((size = git_futils_filesize(fd)) < 0 || !git__is_sizet(size)) {
+		p_close(fd);
+		return git__throw(GIT_EOSERR, "'%s' appears to be corrupted", path);
+	}
+
+	ctx = git_hash_new_ctx();
+
+	len = snprintf(hdr, sizeof(hdr), "blob %"PRIuZ, (size_t)size);
+	assert(len > 0);
+	assert(((size_t) len) < sizeof(hdr));
+	if (len < 0 || ((size_t) len) >= sizeof(hdr))
+		return git__throw(GIT_ERROR, "Failed to format blob header. Length is out of bounds");
+
+	git_hash_update(ctx, hdr, len+1);
+
+	while (size > 0) {
+		ssize_t read_len;
+
+		read_len = read(fd, buffer, sizeof(buffer));
+
+		if (read_len < 0) {
+			p_close(fd);
+			git_hash_free_ctx(ctx);
+			return git__throw(GIT_EOSERR, "Can't read full file '%s'", path);
+		}
+
+		git_hash_update(ctx, buffer, read_len);
+		size -= read_len;
+	}
+
+	p_close(fd);
+
+	git_hash_final(out, ctx);
+	git_hash_free_ctx(ctx);
+
+	return GIT_SUCCESS;
+}