1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/git/csum-file.h b/third_party/git/csum-file.h
new file mode 100644
index 000000000000..f9cbd317fbbc
--- /dev/null
+++ b/third_party/git/csum-file.h
@@ -0,0 +1,65 @@
+#ifndef CSUM_FILE_H
+#define CSUM_FILE_H
+
+#include "hash.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;
+};
+
+void hashfile_checkpoint(struct hashfile *, struct hashfile_checkpoint *);
+int hashfile_truncate(struct hashfile *, struct hashfile_checkpoint *);
+
+/* finalize_hashfile flags */
+#define CSUM_CLOSE		1
+#define CSUM_FSYNC		2
+#define CSUM_HASH_IN_STREAM	4
+
+struct hashfile *hashfd(int fd, const char *name);
+struct hashfile *hashfd_check(const char *name);
+struct hashfile *hashfd_throughput(int fd, const char *name, struct progress *tp);
+int finalize_hashfile(struct hashfile *, unsigned char *, unsigned int);
+void hashwrite(struct hashfile *, const void *, unsigned int);
+void hashflush(struct hashfile *f);
+void crc32_begin(struct hashfile *);
+uint32_t crc32_end(struct hashfile *);
+
+/*
+ * Returns the total number of bytes fed to the hashfile so far (including ones
+ * that have not been written out to the descriptor yet).
+ */
+static inline off_t hashfile_total(struct hashfile *f)
+{
+	return f->total + f->offset;
+}
+
+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