From: Joel Rosdahl <joel@rosdahl.net>
Date: Thu, 4 Jul 2019 07:35:05 +0000 (+0200)
Subject: Allow NULL checksum parameter for common_header_initialize_for_reading
X-Git-Tag: v4.0~907
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=7839217088c70393654dfc597a3d2fdca5afa90b;p=thirdparty%2Fccache.git

Allow NULL checksum parameter for common_header_initialize_for_reading
---

diff --git a/src/common_header.c b/src/common_header.c
index 69fde2188..c2f1e97a2 100644
--- a/src/common_header.c
+++ b/src/common_header.c
@@ -130,8 +130,10 @@ bool common_header_initialize_for_reading(
 		return false;
 	}
 
-	XXH64_reset(checksum, 0);
-	XXH64_update(checksum, header_bytes, sizeof(header_bytes));
+	if (checksum) {
+		XXH64_reset(checksum, 0);
+		XXH64_update(checksum, header_bytes, sizeof(header_bytes));
+	}
 
   *decompr_state = (*decompressor)->init(input, checksum);
 	if (!*decompr_state) {
diff --git a/src/common_header.h b/src/common_header.h
index b2daa5099..f4d23d25f 100644
--- a/src/common_header.h
+++ b/src/common_header.h
@@ -50,7 +50,7 @@ bool common_header_initialize_for_writing(
 // decompressor_state: State for the decompressor. Should be NULL if
 //                     decompressor is NULL.
 // checksum:           Checksum state that will be updated with the read bytes.
-//                     Pass NULL if decompressor is NULL.
+//                     May be NULL for no checksumming.
 bool common_header_initialize_for_reading(
 	struct common_header *header,
 	FILE *input,