kc3-lang/libmd/src/helper.c

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• Hash : 9a77023f
  Author :
  Date : 2019-08-22T16:55:44
  

  build: Use <unistd.h> only if available Some target platforms do not have <unistd.h>, notably Windows when using vanilla MSVC toolchain. Note: The AC_CHECK_HEADERS([unistd.h]) is redundant with LT_INIT, but there is no guarantee for that. [guillem@hadrons.org: - Use AC_CHECK_HEADERS instead of AC_CHECK_HEADER. - Quote argument to AC_CHECK_HEADERS. ] Signed-off-by: Guillem Jover <guillem@hadrons.org>

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• src/helper.c

• /*	$OpenBSD: helper.c,v 1.9 2010/01/08 13:30:21 oga Exp $	*/
  
  /*
   * ----------------------------------------------------------------------------
   * "THE BEER-WARE LICENSE" (Revision 42):
   * <phk@login.dkuug.dk> wrote this file.  As long as you retain this notice you
   * can do whatever you want with this stuff. If we meet some day, and you think
   * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
   * ----------------------------------------------------------------------------
   */
  
  #include <config.h>
  
  #include <sys/stat.h>
  
  #include <errno.h>
  #include <fcntl.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <string.h>
  #ifdef HAVE_UNISTD_H
  #include <unistd.h>
  #endif
  
  #include <hashinc>
  
  #ifndef MIN
  # define MIN(x, y) (((x) < (y)) ? (x) : (y))
  #endif
  
  /* ARGSUSED */
  char *
  HASHEnd(HASH_CTX *ctx, char *buf)
  {
  	int i;
  	uint8_t digest[HASH_DIGEST_LENGTH];
  	static const char hex[] = "0123456789abcdef";
  
  	if (buf == NULL && (buf = malloc(HASH_DIGEST_STRING_LENGTH)) == NULL)
  		return (NULL);
  
  	HASHFinal(digest, ctx);
  	for (i = 0; i < HASH_DIGEST_LENGTH; i++) {
  		buf[i + i] = hex[digest[i] >> 4];
  		buf[i + i + 1] = hex[digest[i] & 0x0f];
  	}
  	buf[i + i] = '\0';
  	memset(digest, 0, sizeof(digest));
  	return (buf);
  }
  
  char *
  HASHFileChunk(const char *filename, char *buf, off_t off, off_t len)
  {
  	struct stat sb;
  	uint8_t buffer[BUFSIZ];
  	HASH_CTX ctx;
  	int fd, save_errno;
  	ssize_t nr;
  
  	HASHInit(&ctx);
  
  	if ((fd = open(filename, O_RDONLY)) < 0)
  		return (NULL);
  	if (len == 0) {
  		if (fstat(fd, &sb) == -1) {
  			close(fd);
  			return (NULL);
  		}
  		len = sb.st_size;
  	}
  	if (off > 0 && lseek(fd, off, SEEK_SET) < 0) {
  		close(fd);
  		return (NULL);
  	}
  
  	while ((nr = read(fd, buffer, MIN(sizeof(buffer), len))) > 0) {
  		HASHUpdate(&ctx, buffer, (size_t)nr);
  		if (len > 0 && (len -= nr) == 0)
  			break;
  	}
  
  	save_errno = errno;
  	close(fd);
  	errno = save_errno;
  	return (nr < 0 ? NULL : HASHEnd(&ctx, buf));
  }
  
  char *
  HASHFile(const char *filename, char *buf)
  {
  	return (HASHFileChunk(filename, buf, (off_t)0, (off_t)0));
  }
  
  char *
  HASHData(const uint8_t *data, size_t len, char *buf)
  {
  	HASH_CTX ctx;
  
  	HASHInit(&ctx);
  	HASHUpdate(&ctx, data, len);
  	return (HASHEnd(&ctx, buf));
  }
  

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