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-rw-r--r--hash.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/hash.h b/hash.h
index 52a4f1a3f4..e0f3f16b06 100644
--- a/hash.h
+++ b/hash.h
@@ -16,6 +16,7 @@
#endif
#if defined(SHA256_GCRYPT)
+#define SHA256_NEEDS_CLONE_HELPER
#include "sha256/gcrypt.h"
#elif defined(SHA256_OPENSSL)
#include <openssl/sha.h>
@@ -54,12 +55,28 @@
#define git_SHA256_Update platform_SHA256_Update
#define git_SHA256_Final platform_SHA256_Final
+#ifdef platform_SHA256_Clone
+#define git_SHA256_Clone platform_SHA256_Clone
+#endif
+
#ifdef SHA1_MAX_BLOCK_SIZE
#include "compat/sha1-chunked.h"
#undef git_SHA1_Update
#define git_SHA1_Update git_SHA1_Update_Chunked
#endif
+static inline void git_SHA1_Clone(git_SHA_CTX *dst, const git_SHA_CTX *src)
+{
+ memcpy(dst, src, sizeof(*dst));
+}
+
+#ifndef SHA256_NEEDS_CLONE_HELPER
+static inline void git_SHA256_Clone(git_SHA256_CTX *dst, const git_SHA256_CTX *src)
+{
+ memcpy(dst, src, sizeof(*dst));
+}
+#endif
+
/*
* Note that these constants are suitable for indexing the hash_algos array and
* comparing against each other, but are otherwise arbitrary, so they should not
@@ -85,6 +102,7 @@ union git_hash_ctx {
typedef union git_hash_ctx git_hash_ctx;
typedef void (*git_hash_init_fn)(git_hash_ctx *ctx);
+typedef void (*git_hash_clone_fn)(git_hash_ctx *dst, const git_hash_ctx *src);
typedef void (*git_hash_update_fn)(git_hash_ctx *ctx, const void *in, size_t len);
typedef void (*git_hash_final_fn)(unsigned char *hash, git_hash_ctx *ctx);
@@ -110,6 +128,9 @@ struct git_hash_algo {
/* The hash initialization function. */
git_hash_init_fn init_fn;
+ /* The hash context cloning function. */
+ git_hash_clone_fn clone_fn;
+
/* The hash update function. */
git_hash_update_fn update_fn;