blob.h

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/*
 * blob.h
 *
 * Binary blob handling.
 *
 * Copyright (c) 2002 Dug Song <dugsong@monkey.org>
 *
 * $Id: blob.h,v 1.2 2002/04/05 03:06:44 dugsong Exp $
 */

#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 */

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