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 * 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;

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 /* DNET_BLOB_H */

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