1 files changed, 53 insertions, 0 deletions
diff --git a/csum-file.h b/csum-file.h
new file mode 100644
index 0000000000..992e5c0141
--- /dev/null
+++ b/csum-file.h
@@ -0,0 +1,53 @@
+#ifndef CSUM_FILE_H
+#define CSUM_FILE_H
+
+struct progress;
+
+/* A SHA1-protected file */
+struct hashfile {
+	int fd;
+	int check_fd;
+	unsigned int offset;
+	git_hash_ctx ctx;
+	off_t total;
+	struct progress *tp;
+	const char *name;
+	int do_crc;
+	uint32_t crc32;
+	unsigned char buffer[8192];
+};
+
+/* Checkpoint */
+struct hashfile_checkpoint {
+	off_t offset;
+	git_hash_ctx ctx;
+};
+
+extern void hashfile_checkpoint(struct hashfile *, struct hashfile_checkpoint *);
+extern int hashfile_truncate(struct hashfile *, struct hashfile_checkpoint *);
+
+/* hashclose flags */
+#define CSUM_CLOSE	1
+#define CSUM_FSYNC	2
+
+extern struct hashfile *hashfd(int fd, const char *name);
+extern struct hashfile *hashfd_check(const char *name);
+extern struct hashfile *hashfd_throughput(int fd, const char *name, struct progress *tp);
+extern int hashclose(struct hashfile *, unsigned char *, unsigned int);
+extern void hashwrite(struct hashfile *, const void *, unsigned int);
+extern void hashflush(struct hashfile *f);
+extern void crc32_begin(struct hashfile *);
+extern uint32_t crc32_end(struct hashfile *);
+
+static inline void hashwrite_u8(struct hashfile *f, uint8_t data)
+{
+	hashwrite(f, &data, sizeof(data));
+}
+
+static inline void hashwrite_be32(struct hashfile *f, uint32_t data)
+{
+	data = htonl(data);
+	hashwrite(f, &data, sizeof(data));
+}
+
+#endif