text: /*
   * blob.h
   *
   * Binary blob handling.
   *
   * Copyright (c) 2002 Dug Song <dugsong@monkey.org>
   *
   * $Id: blob.h 334 2002-04-05 03:06:44Z dugsong $
   */
  
  #ifndef DNET_BLOB_H
  #define DNET_BLOB_H
  
  typedef struct blob {
  	u_char		*base;		/* start of data */
  	int		 off;		/* offset into data */
  	int		 end;		/* end of data */
  	int		 size;		/* size of allocation */
  } blob_t;
  
  __BEGIN_DECLS
  blob_t	*blob_new(void);
  
  int	 blob_read(blob_t *b, void *buf, int len);
  int	 blob_write(blob_t *b, const void *buf, int len);
  
  int	 blob_seek(blob_t *b, int off, int whence);
  #define  blob_skip(b, l)	blob_seek(b, l, SEEK_CUR)
  #define  blob_rewind(b)		blob_seek(b, 0, SEEK_SET)
  
  #define	 blob_offset(b)		((b)->off)
  #define	 blob_left(b)		((b)->end - (b)->off)
  
  int	 blob_index(blob_t *b, const void *buf, int len);
  int	 blob_rindex(blob_t *b, const void *buf, int len);
  
  int	 blob_pack(blob_t *b, const char *fmt, ...);
  int	 blob_unpack(blob_t *b, const char *fmt, ...);
  
  int	 blob_insert(blob_t *b, const void *buf, int len);
  int	 blob_delete(blob_t *b, void *buf, int len);
  
  int	 blob_print(blob_t *b, char *style, int len);
  
  blob_t	*blob_free(blob_t *b);
  
  int	 blob_register_alloc(size_t size, void *(*bmalloc)(size_t),
  	    void (*bfree)(void *), void *(*brealloc)(void *, size_t));
  #ifdef va_start
  typedef int (*blob_fmt_cb)(int pack, int len, blob_t *b, va_list *arg);
  
  int	 blob_register_pack(char c, blob_fmt_cb fmt_cb);
  #endif
  __END_DECLS
  
  #endif /* DNET_BLOB_H */
  