averello/git-mirror
1
0
Fork 0
mirror of https://github.com/git/git.git synced 2025-12-12 20:36:24 +01:00
Code Issues Packages Projects Releases Wiki Activity

sha1: do not redefine platform_SHA_CTX and friends

Browse Source 
Our in-tree SHA-1 wrappers all define platform_SHA_CTX and related
macros to point at the opaque "context" type, init, update, and similar
functions for each specific implementation.

In hash.h, we use these platform_ variables to set up the function
pointers for, e.g., the_hash_algo->init_fn(), etc.

But while these header files have a header-specific macro that prevents
them declaring their structs / functions multiple times, they
unconditionally define the platform variables, making it impossible to
load multiple SHA-1 implementations at once.

As a prerequisite for loading a separate SHA-1 implementation for
non-cryptographic uses, only define the platform_ variables if they have
not already been defined.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2024-09-26 11:22:44 -04:00
committed by Junio C Hamano
parent c177d3dc50
commit 4c61a1d040
3 changed files with 7 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
sha1dc_git.h
View File

@@ -18,7 +18,10 @@ void git_SHA1DCFinal(unsigned char [20], SHA1_CTX *);
void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *data, unsigned long len);
#define platform_SHA_IS_SHA1DC /* used by "test-tool sha1-is-sha1dc" */
#ifndef platform_SHA_CTX
#define platform_SHA_CTX SHA1_CTX
#define platform_SHA1_Init git_SHA1DCInit
#define platform_SHA1_Update git_SHA1DCUpdate
#define platform_SHA1_Final git_SHA1DCFinal
#endif