X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=pack-write.c;h=a905ca4486754f099a30f90a2fcd22d0c771a070;hb=d577cd216e0adb9cbc726dddd1a0858b4ab4e6e3;hp=9f47cf9961212242bc01082944e83fb54da2a515;hpb=8165952517bf82b6a632cefc047ad14f36a74b25;p=git.git

diff --git a/pack-write.c b/pack-write.c
index 9f47cf996..a905ca448 100644
--- a/pack-write.c
+++ b/pack-write.c
@@ -253,3 +253,30 @@ char *index_pack_lockfile(int ip_out)
 	}
 	return NULL;
 }
+
+/*
+ * The per-object header is a pretty dense thing, which is
+ *  - first byte: low four bits are "size", then three bits of "type",
+ *    and the high bit is "size continues".
+ *  - each byte afterwards: low seven bits are size continuation,
+ *    with the high bit being "size continues"
+ */
+int encode_in_pack_object_header(enum object_type type, uintmax_t size, unsigned char *hdr)
+{
+	int n = 1;
+	unsigned char c;
+
+	if (type < OBJ_COMMIT || type > OBJ_REF_DELTA)
+		die("bad type %d", type);
+
+	c = (type << 4) | (size & 15);
+	size >>= 4;
+	while (size) {
+		*hdr++ = c | 0x80;
+		c = size & 0x7f;
+		size >>= 7;
+		n++;
+	}
+	*hdr = c;
+	return n;
+}