include/kernel/cbuf.h

   1 /*
   2 ** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
   3 ** Distributed under the terms of the NewOS License.
   4 */
   5 #ifndef _KERNEL_CBUF_H
   6 #define _KERNEL_CBUF_H
   7
   8 #include <kernel/kernel.h>
   9
  10 #define CBUF_LEN 2048
  11
  12 #define CBUF_FLAG_CHAIN_HEAD 1
  13 #define CBUF_FLAG_CHAIN_TAIL 2
  14
  15 typedef struct cbuf {
  16         struct cbuf *next;
  17         size_t len;
  18         size_t total_len;
  19         void *data;
  20         int flags;
  21         char dat[CBUF_LEN - sizeof(struct cbuf *) - 2*sizeof(int) - sizeof(void *) - sizeof(int)];
  22 } cbuf;
  23
  24 int cbuf_init(void);
  25 cbuf *cbuf_get_chain(size_t len);
  26 cbuf *cbuf_get_chain_noblock(size_t len);
  27 void cbuf_free_chain_noblock(cbuf *buf);
  28 void cbuf_free_chain(cbuf *buf);
  29
  30 size_t cbuf_get_len(cbuf *buf);
  31 void *cbuf_get_ptr(cbuf *buf, size_t offset);
  32 int cbuf_is_contig_region(cbuf *buf, size_t start, size_t end);
  33
  34 int cbuf_memcpy_to_chain(cbuf *chain, size_t offset, const void *_src, size_t len);
  35 int cbuf_memcpy_from_chain(void *dest, cbuf *chain, size_t offset, size_t len);
  36
  37 int cbuf_user_memcpy_to_chain(cbuf *chain, size_t offset, const void *_src, size_t len);
  38 int cbuf_user_memcpy_from_chain(void *dest, cbuf *chain, size_t offset, size_t len);
  39
  40 uint16 cbuf_ones_cksum16(cbuf *chain, size_t offset, size_t len);
  41
  42 cbuf *cbuf_merge_chains(cbuf *chain1, cbuf *chain2);
  43 cbuf *cbuf_duplicate_chain(cbuf *chain, size_t offset, size_t len);
  44
  45 int cbuf_truncate_head(cbuf *chain, size_t trunc_bytes);
  46 int cbuf_truncate_tail(cbuf *chain, size_t trunc_bytes);
  47
  48 void cbuf_test(void);
  49
  50 #endif
  51