thodg/libgit2/src/hash.h

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• Hash : 03dc6480
  Author :
  Date : 2019-01-02T09:27:44
  

  hash: convert `global_init` macros to real function The `git_hash_global_init` function is simply defined as a macro to zero for most of the different hash implementations. This makes it impossible to treat it like a function pointer, which is required for a later commit where we want to improve the way global initialization works. Fix the issue by converting all no-op macros to an inline function returning zero. There's a small gotcha here, though: as most hash implementations only have a header file, but not a corresponding implementation file, we cannot declare the function as non-static. But declaring it as `static inline` fails, too, as there is a previous declaration as non-static. So we have to move the function declaration after the include that brings in the function definition, as it is allowed to have a non-static declaration after a static definition, but not the other way round.

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• src/hash.h

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #ifndef INCLUDE_hash_h__
  #define INCLUDE_hash_h__
  
  #include "common.h"
  
  #include "git2/oid.h"
  
  typedef struct git_hash_prov git_hash_prov;
  typedef struct git_hash_ctx git_hash_ctx;
  
  int git_hash_ctx_init(git_hash_ctx *ctx);
  void git_hash_ctx_cleanup(git_hash_ctx *ctx);
  
  #if defined(GIT_SHA1_COLLISIONDETECT)
  # include "hash/hash_collisiondetect.h"
  #elif defined(GIT_SHA1_COMMON_CRYPTO)
  # include "hash/hash_common_crypto.h"
  #elif defined(GIT_SHA1_OPENSSL)
  # include "hash/hash_openssl.h"
  #elif defined(GIT_SHA1_WIN32)
  # include "hash/hash_win32.h"
  #elif defined(GIT_SHA1_MBEDTLS)
  # include "hash/hash_mbedtls.h"
  #else
  # include "hash/hash_generic.h"
  #endif
  
  int git_hash_global_init(void);
  
  typedef struct {
  	void *data;
  	size_t len;
  } git_buf_vec;
  
  int git_hash_init(git_hash_ctx *c);
  int git_hash_update(git_hash_ctx *c, const void *data, size_t len);
  int git_hash_final(git_oid *out, git_hash_ctx *c);
  
  int git_hash_buf(git_oid *out, const void *data, size_t len);
  int git_hash_vec(git_oid *out, git_buf_vec *vec, size_t n);
  
  #endif
  

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