X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=csum-file.c;h=53f5375b6ca3368de6647cf5edcd7fb4dec79657;hb=a12c6b0149e3dadd0701dac4fd0ba2463d251650;hp=fc97d6e04528b5c5b55fc211a462f3cb828f3d49;hpb=8769e93327f5efc26d179d794a67a5b993cd3693;p=git.git

diff --git a/csum-file.c b/csum-file.c
index fc97d6e04..53f5375b6 100644
--- a/csum-file.c
+++ b/csum-file.c
@@ -158,6 +158,26 @@ struct sha1file *sha1fd_throughput(int fd, const char *name, struct progress *tp
 	return f;
 }
 
+void sha1file_checkpoint(struct sha1file *f, struct sha1file_checkpoint *checkpoint)
+{
+	sha1flush(f);
+	checkpoint->offset = f->total;
+	checkpoint->ctx = f->ctx;
+}
+
+int sha1file_truncate(struct sha1file *f, struct sha1file_checkpoint *checkpoint)
+{
+	off_t offset = checkpoint->offset;
+
+	if (ftruncate(f->fd, offset) ||
+	    lseek(f->fd, offset, SEEK_SET) != offset)
+		return -1;
+	f->total = offset;
+	f->ctx = checkpoint->ctx;
+	f->offset = 0; /* sha1flush() was called in checkpoint */
+	return 0;
+}
+
 void crc32_begin(struct sha1file *f)
 {
 	f->crc32 = crc32(0, NULL, 0);