thodg/libgit2/src/compress.c

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• Hash : 4bc1a30f
  Author :
  Date : 2012-06-10T22:04:24
  

  util: add git__compress()

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• src/compress.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "compress.h"
  
  #include <zlib.h>
  
  #define BUFFER_SIZE (1024 * 1024)
  
  int git__compress(git_buf *buf, const void *buff, size_t len)
  {
  	z_stream zs;
  	char *zb;
  	size_t have;
  
  	memset(&zs, 0, sizeof(zs));
  	if (deflateInit(&zs, Z_DEFAULT_COMPRESSION) != Z_OK)
  		return -1;
  
  	zb = git__malloc(BUFFER_SIZE);
  	GITERR_CHECK_ALLOC(zb);
  
  	zs.next_in = (void *)buff;
  	zs.avail_in = (uInt)len;
  
  	do {
  		zs.next_out = (unsigned char *)zb;
  		zs.avail_out = BUFFER_SIZE;
  
  		if (deflate(&zs, Z_FINISH) == Z_STREAM_ERROR) {
  			git__free(zb);
  			return -1;
  		}
  
  		have = BUFFER_SIZE - (size_t)zs.avail_out;
  
  		if (git_buf_put(buf, zb, have) < 0) {
  			git__free(zb);
  			return -1;
  		}
  
  	} while (zs.avail_out == 0);
  
  	assert(zs.avail_in == 0);
  
  	deflateEnd(&zs);
  	git__free(zb);
  	return 0;
  }
  

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