thodg/libgit2/src/hash/hash_common_crypto.h

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• Hash : bdb54214
  Author :
  Date : 2017-12-11T16:46:05
  

  hash: commoncrypto hash should support large files Teach the CommonCrypto hash mechanisms to support large files. The hash primitives take a `CC_LONG` (aka `uint32_t`) at a time. So loop to give the hash function at most an unsigned 32 bit's worth of bytes until we have hashed the entire file.

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• src/hash/hash_common_crypto.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_common_crypto_h__
  #define INCLUDE_hash_common_crypto_h__
  
  #include "hash.h"
  
  #include <CommonCrypto/CommonDigest.h>
  
  struct git_hash_ctx {
  	CC_SHA1_CTX c;
  };
  
  #define CC_LONG_MAX ((CC_LONG)-1)
  
  #define git_hash_global_init() 0
  #define git_hash_ctx_init(ctx) git_hash_init(ctx)
  #define git_hash_ctx_cleanup(ctx)
  
  GIT_INLINE(int) git_hash_init(git_hash_ctx *ctx)
  {
  	assert(ctx);
  	CC_SHA1_Init(&ctx->c);
  	return 0;
  }
  
  GIT_INLINE(int) git_hash_update(git_hash_ctx *ctx, const void *_data, size_t len)
  {
  	const unsigned char *data = _data;
  
  	assert(ctx);
  
  	while (len > 0) {
  		CC_LONG chunk = (len > CC_LONG_MAX) ? CC_LONG_MAX : (CC_LONG)len;
  
  		CC_SHA1_Update(&ctx->c, data, chunk);
  
  		data += chunk;
  		len -= chunk;
  	}
  
  	return 0;
  }
  
  GIT_INLINE(int) git_hash_final(git_oid *out, git_hash_ctx *ctx)
  {
  	assert(ctx);
  	CC_SHA1_Final(out->id, &ctx->c);
  	return 0;
  }
  
  #endif /* INCLUDE_hash_common_crypto_h__ */
  

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