thodg/libgit2/src/hash.h

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• Hash : b7187ed7
  Author :
  Date : 2019-02-22T14:38:31
  

  hash: add ability to distinguish algorithms
  
  Create an enum that allows us to distinguish between different
  hashing algorithms. This enum is embedded into each
  `git_hash_ctx` and will instruct the code to which hashing
  function the particular request shall be dispatched.
  
  As we do not yet have multiple hashing algorithms, we simply
  initialize the hash algorithm to always be SHA1. At a later
  point, we will have to extend the `git_hash_init_ctx` function to
  get as parameter which algorithm shall be used.
  

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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 {
  	void *data;
  	size_t len;
  } git_buf_vec;
  
  typedef enum {
  	GIT_HASH_ALGO_UNKNOWN = 0,
  	GIT_HASH_ALGO_SHA1,
  } git_hash_algo_t;
  
  #include "hash/sha1.h"
  
  typedef struct git_hash_ctx {
  	union {
  		git_hash_sha1_ctx sha1;
  	};
  	git_hash_algo_t algo;
  } git_hash_ctx;
  
  int git_hash_global_init(void);
  
  int git_hash_ctx_init(git_hash_ctx *ctx);
  void git_hash_ctx_cleanup(git_hash_ctx *ctx);
  
  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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